1use crate::{
   2    CloseWindow, NewFile, NewTerminal, OpenInTerminal, OpenOptions, OpenTerminal, OpenVisible,
   3    SplitDirection, ToggleFileFinder, ToggleProjectSymbols, ToggleZoom, Workspace,
   4    WorkspaceItemBuilder,
   5    invalid_item_view::InvalidItemView,
   6    item::{
   7        ActivateOnClose, ClosePosition, Item, ItemBufferKind, ItemHandle, ItemSettings,
   8        PreviewTabsSettings, ProjectItemKind, SaveOptions, ShowCloseButton, ShowDiagnostics,
   9        TabContentParams, TabTooltipContent, WeakItemHandle,
  10    },
  11    move_item,
  12    notifications::NotifyResultExt,
  13    toolbar::Toolbar,
  14    workspace_settings::{AutosaveSetting, TabBarSettings, WorkspaceSettings},
  15};
  16use anyhow::Result;
  17use collections::{BTreeSet, HashMap, HashSet, VecDeque};
  18use futures::{StreamExt, stream::FuturesUnordered};
  19use gpui::{
  20    Action, AnyElement, App, AsyncWindowContext, ClickEvent, ClipboardItem, Context, Corner, Div,
  21    DragMoveEvent, Entity, EntityId, EventEmitter, ExternalPaths, FocusHandle, FocusOutEvent,
  22    Focusable, IsZero, KeyContext, MouseButton, MouseDownEvent, NavigationDirection, Pixels, Point,
  23    PromptLevel, Render, ScrollHandle, Subscription, Task, WeakEntity, WeakFocusHandle, Window,
  24    actions, anchored, deferred, prelude::*,
  25};
  26use itertools::Itertools;
  27use language::DiagnosticSeverity;
  28use parking_lot::Mutex;
  29use project::{DirectoryLister, Project, ProjectEntryId, ProjectPath, WorktreeId};
  30use schemars::JsonSchema;
  31use serde::Deserialize;
  32use settings::{Settings, SettingsStore};
  33use std::{
  34    any::Any,
  35    cmp, fmt, mem,
  36    num::NonZeroUsize,
  37    ops::ControlFlow,
  38    path::PathBuf,
  39    rc::Rc,
  40    sync::{
  41        Arc,
  42        atomic::{AtomicUsize, Ordering},
  43    },
  44    time::Duration,
  45};
  46use theme::ThemeSettings;
  47use ui::{
  48    ButtonSize, Color, ContextMenu, ContextMenuEntry, ContextMenuItem, DecoratedIcon, IconButton,
  49    IconButtonShape, IconDecoration, IconDecorationKind, IconName, IconSize, Indicator, Label,
  50    PopoverMenu, PopoverMenuHandle, Tab, TabBar, TabPosition, Tooltip, prelude::*,
  51    right_click_menu,
  52};
  53use util::{ResultExt, debug_panic, maybe, paths::PathStyle, truncate_and_remove_front};
  54
  55/// A selected entry in e.g. project panel.
  56#[derive(Copy, Clone, Debug, PartialEq, Eq, PartialOrd, Ord, Hash)]
  57pub struct SelectedEntry {
  58    pub worktree_id: WorktreeId,
  59    pub entry_id: ProjectEntryId,
  60}
  61
  62/// A group of selected entries from project panel.
  63#[derive(Debug)]
  64pub struct DraggedSelection {
  65    pub active_selection: SelectedEntry,
  66    pub marked_selections: Arc<[SelectedEntry]>,
  67}
  68
  69impl DraggedSelection {
  70    pub fn items<'a>(&'a self) -> Box<dyn Iterator<Item = &'a SelectedEntry> + 'a> {
  71        if self.marked_selections.contains(&self.active_selection) {
  72            Box::new(self.marked_selections.iter())
  73        } else {
  74            Box::new(std::iter::once(&self.active_selection))
  75        }
  76    }
  77}
  78
  79#[derive(Clone, Copy, PartialEq, Debug, Deserialize, JsonSchema)]
  80#[serde(rename_all = "snake_case")]
  81pub enum SaveIntent {
  82    /// write all files (even if unchanged)
  83    /// prompt before overwriting on-disk changes
  84    Save,
  85    /// same as Save, but without auto formatting
  86    SaveWithoutFormat,
  87    /// write any files that have local changes
  88    /// prompt before overwriting on-disk changes
  89    SaveAll,
  90    /// always prompt for a new path
  91    SaveAs,
  92    /// prompt "you have unsaved changes" before writing
  93    Close,
  94    /// write all dirty files, don't prompt on conflict
  95    Overwrite,
  96    /// skip all save-related behavior
  97    Skip,
  98}
  99
 100/// Activates a specific item in the pane by its index.
 101#[derive(Clone, PartialEq, Debug, Deserialize, JsonSchema, Default, Action)]
 102#[action(namespace = pane)]
 103pub struct ActivateItem(pub usize);
 104
 105/// Closes the currently active item in the pane.
 106#[derive(Clone, PartialEq, Debug, Deserialize, JsonSchema, Default, Action)]
 107#[action(namespace = pane)]
 108#[serde(deny_unknown_fields)]
 109pub struct CloseActiveItem {
 110    #[serde(default)]
 111    pub save_intent: Option<SaveIntent>,
 112    #[serde(default)]
 113    pub close_pinned: bool,
 114}
 115
 116/// Closes all inactive items in the pane.
 117#[derive(Clone, PartialEq, Debug, Deserialize, JsonSchema, Default, Action)]
 118#[action(namespace = pane)]
 119#[serde(deny_unknown_fields)]
 120#[action(deprecated_aliases = ["pane::CloseInactiveItems"])]
 121pub struct CloseOtherItems {
 122    #[serde(default)]
 123    pub save_intent: Option<SaveIntent>,
 124    #[serde(default)]
 125    pub close_pinned: bool,
 126}
 127
 128/// Closes all multibuffers in the pane.
 129#[derive(Clone, PartialEq, Debug, Deserialize, JsonSchema, Default, Action)]
 130#[action(namespace = pane)]
 131#[serde(deny_unknown_fields)]
 132pub struct CloseMultibufferItems {
 133    #[serde(default)]
 134    pub save_intent: Option<SaveIntent>,
 135    #[serde(default)]
 136    pub close_pinned: bool,
 137}
 138
 139/// Closes all items in the pane.
 140#[derive(Clone, PartialEq, Debug, Deserialize, JsonSchema, Default, Action)]
 141#[action(namespace = pane)]
 142#[serde(deny_unknown_fields)]
 143pub struct CloseAllItems {
 144    #[serde(default)]
 145    pub save_intent: Option<SaveIntent>,
 146    #[serde(default)]
 147    pub close_pinned: bool,
 148}
 149
 150/// Closes all items that have no unsaved changes.
 151#[derive(Clone, PartialEq, Debug, Deserialize, JsonSchema, Default, Action)]
 152#[action(namespace = pane)]
 153#[serde(deny_unknown_fields)]
 154pub struct CloseCleanItems {
 155    #[serde(default)]
 156    pub close_pinned: bool,
 157}
 158
 159/// Closes all items to the right of the current item.
 160#[derive(Clone, PartialEq, Debug, Deserialize, JsonSchema, Default, Action)]
 161#[action(namespace = pane)]
 162#[serde(deny_unknown_fields)]
 163pub struct CloseItemsToTheRight {
 164    #[serde(default)]
 165    pub close_pinned: bool,
 166}
 167
 168/// Closes all items to the left of the current item.
 169#[derive(Clone, PartialEq, Debug, Deserialize, JsonSchema, Default, Action)]
 170#[action(namespace = pane)]
 171#[serde(deny_unknown_fields)]
 172pub struct CloseItemsToTheLeft {
 173    #[serde(default)]
 174    pub close_pinned: bool,
 175}
 176
 177/// Reveals the current item in the project panel.
 178#[derive(Clone, PartialEq, Debug, Deserialize, JsonSchema, Default, Action)]
 179#[action(namespace = pane)]
 180#[serde(deny_unknown_fields)]
 181pub struct RevealInProjectPanel {
 182    #[serde(skip)]
 183    pub entry_id: Option<u64>,
 184}
 185
 186/// Opens the search interface with the specified configuration.
 187#[derive(Clone, PartialEq, Debug, Deserialize, JsonSchema, Default, Action)]
 188#[action(namespace = pane)]
 189#[serde(deny_unknown_fields)]
 190pub struct DeploySearch {
 191    #[serde(default)]
 192    pub replace_enabled: bool,
 193    #[serde(default)]
 194    pub included_files: Option<String>,
 195    #[serde(default)]
 196    pub excluded_files: Option<String>,
 197}
 198
 199actions!(
 200    pane,
 201    [
 202        /// Activates the previous item in the pane.
 203        ActivatePreviousItem,
 204        /// Activates the next item in the pane.
 205        ActivateNextItem,
 206        /// Activates the last item in the pane.
 207        ActivateLastItem,
 208        /// Switches to the alternate file.
 209        AlternateFile,
 210        /// Navigates back in history.
 211        GoBack,
 212        /// Navigates forward in history.
 213        GoForward,
 214        /// Joins this pane into the next pane.
 215        JoinIntoNext,
 216        /// Joins all panes into one.
 217        JoinAll,
 218        /// Reopens the most recently closed item.
 219        ReopenClosedItem,
 220        /// Splits the pane to the left, cloning the current item.
 221        SplitLeft,
 222        /// Splits the pane upward, cloning the current item.
 223        SplitUp,
 224        /// Splits the pane to the right, cloning the current item.
 225        SplitRight,
 226        /// Splits the pane downward, cloning the current item.
 227        SplitDown,
 228        /// Splits the pane to the left, moving the current item.
 229        SplitAndMoveLeft,
 230        /// Splits the pane upward, moving the current item.
 231        SplitAndMoveUp,
 232        /// Splits the pane to the right, moving the current item.
 233        SplitAndMoveRight,
 234        /// Splits the pane downward, moving the current item.
 235        SplitAndMoveDown,
 236        /// Splits the pane horizontally.
 237        SplitHorizontal,
 238        /// Splits the pane vertically.
 239        SplitVertical,
 240        /// Swaps the current item with the one to the left.
 241        SwapItemLeft,
 242        /// Swaps the current item with the one to the right.
 243        SwapItemRight,
 244        /// Toggles preview mode for the current tab.
 245        TogglePreviewTab,
 246        /// Toggles pin status for the current tab.
 247        TogglePinTab,
 248        /// Unpins all tabs in the pane.
 249        UnpinAllTabs,
 250    ]
 251);
 252
 253impl DeploySearch {
 254    pub fn find() -> Self {
 255        Self {
 256            replace_enabled: false,
 257            included_files: None,
 258            excluded_files: None,
 259        }
 260    }
 261}
 262
 263const MAX_NAVIGATION_HISTORY_LEN: usize = 1024;
 264
 265pub enum Event {
 266    AddItem {
 267        item: Box<dyn ItemHandle>,
 268    },
 269    ActivateItem {
 270        local: bool,
 271        focus_changed: bool,
 272    },
 273    Remove {
 274        focus_on_pane: Option<Entity<Pane>>,
 275    },
 276    RemovedItem {
 277        item: Box<dyn ItemHandle>,
 278    },
 279    Split {
 280        direction: SplitDirection,
 281        clone_active_item: bool,
 282    },
 283    ItemPinned,
 284    ItemUnpinned,
 285    JoinAll,
 286    JoinIntoNext,
 287    ChangeItemTitle,
 288    Focus,
 289    ZoomIn,
 290    ZoomOut,
 291    UserSavedItem {
 292        item: Box<dyn WeakItemHandle>,
 293        save_intent: SaveIntent,
 294    },
 295}
 296
 297impl fmt::Debug for Event {
 298    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
 299        match self {
 300            Event::AddItem { item } => f
 301                .debug_struct("AddItem")
 302                .field("item", &item.item_id())
 303                .finish(),
 304            Event::ActivateItem { local, .. } => f
 305                .debug_struct("ActivateItem")
 306                .field("local", local)
 307                .finish(),
 308            Event::Remove { .. } => f.write_str("Remove"),
 309            Event::RemovedItem { item } => f
 310                .debug_struct("RemovedItem")
 311                .field("item", &item.item_id())
 312                .finish(),
 313            Event::Split {
 314                direction,
 315                clone_active_item,
 316            } => f
 317                .debug_struct("Split")
 318                .field("direction", direction)
 319                .field("clone_active_item", clone_active_item)
 320                .finish(),
 321            Event::JoinAll => f.write_str("JoinAll"),
 322            Event::JoinIntoNext => f.write_str("JoinIntoNext"),
 323            Event::ChangeItemTitle => f.write_str("ChangeItemTitle"),
 324            Event::Focus => f.write_str("Focus"),
 325            Event::ZoomIn => f.write_str("ZoomIn"),
 326            Event::ZoomOut => f.write_str("ZoomOut"),
 327            Event::UserSavedItem { item, save_intent } => f
 328                .debug_struct("UserSavedItem")
 329                .field("item", &item.id())
 330                .field("save_intent", save_intent)
 331                .finish(),
 332            Event::ItemPinned => f.write_str("ItemPinned"),
 333            Event::ItemUnpinned => f.write_str("ItemUnpinned"),
 334        }
 335    }
 336}
 337
 338/// A container for 0 to many items that are open in the workspace.
 339/// Treats all items uniformly via the [`ItemHandle`] trait, whether it's an editor, search results multibuffer, terminal or something else,
 340/// responsible for managing item tabs, focus and zoom states and drag and drop features.
 341/// Can be split, see `PaneGroup` for more details.
 342pub struct Pane {
 343    alternate_file_items: (
 344        Option<Box<dyn WeakItemHandle>>,
 345        Option<Box<dyn WeakItemHandle>>,
 346    ),
 347    focus_handle: FocusHandle,
 348    items: Vec<Box<dyn ItemHandle>>,
 349    activation_history: Vec<ActivationHistoryEntry>,
 350    next_activation_timestamp: Arc<AtomicUsize>,
 351    zoomed: bool,
 352    was_focused: bool,
 353    active_item_index: usize,
 354    preview_item_id: Option<EntityId>,
 355    last_focus_handle_by_item: HashMap<EntityId, WeakFocusHandle>,
 356    nav_history: NavHistory,
 357    toolbar: Entity<Toolbar>,
 358    pub(crate) workspace: WeakEntity<Workspace>,
 359    project: WeakEntity<Project>,
 360    pub drag_split_direction: Option<SplitDirection>,
 361    can_drop_predicate: Option<Arc<dyn Fn(&dyn Any, &mut Window, &mut App) -> bool>>,
 362    custom_drop_handle: Option<
 363        Arc<dyn Fn(&mut Pane, &dyn Any, &mut Window, &mut Context<Pane>) -> ControlFlow<(), ()>>,
 364    >,
 365    can_split_predicate:
 366        Option<Arc<dyn Fn(&mut Self, &dyn Any, &mut Window, &mut Context<Self>) -> bool>>,
 367    can_toggle_zoom: bool,
 368    should_display_tab_bar: Rc<dyn Fn(&Window, &mut Context<Pane>) -> bool>,
 369    render_tab_bar_buttons: Rc<
 370        dyn Fn(
 371            &mut Pane,
 372            &mut Window,
 373            &mut Context<Pane>,
 374        ) -> (Option<AnyElement>, Option<AnyElement>),
 375    >,
 376    render_tab_bar: Rc<dyn Fn(&mut Pane, &mut Window, &mut Context<Pane>) -> AnyElement>,
 377    show_tab_bar_buttons: bool,
 378    max_tabs: Option<NonZeroUsize>,
 379    use_max_tabs: bool,
 380    _subscriptions: Vec<Subscription>,
 381    tab_bar_scroll_handle: ScrollHandle,
 382    /// This is set to true if a user scroll has occurred more recently than a system scroll
 383    /// We want to suppress certain system scrolls when the user has intentionally scrolled
 384    suppress_scroll: bool,
 385    /// Is None if navigation buttons are permanently turned off (and should not react to setting changes).
 386    /// Otherwise, when `display_nav_history_buttons` is Some, it determines whether nav buttons should be displayed.
 387    display_nav_history_buttons: Option<bool>,
 388    double_click_dispatch_action: Box<dyn Action>,
 389    save_modals_spawned: HashSet<EntityId>,
 390    close_pane_if_empty: bool,
 391    pub new_item_context_menu_handle: PopoverMenuHandle<ContextMenu>,
 392    pub split_item_context_menu_handle: PopoverMenuHandle<ContextMenu>,
 393    pinned_tab_count: usize,
 394    diagnostics: HashMap<ProjectPath, DiagnosticSeverity>,
 395    zoom_out_on_close: bool,
 396    diagnostic_summary_update: Task<()>,
 397    /// If a certain project item wants to get recreated with specific data, it can persist its data before the recreation here.
 398    pub project_item_restoration_data: HashMap<ProjectItemKind, Box<dyn Any + Send>>,
 399}
 400
 401pub struct ActivationHistoryEntry {
 402    pub entity_id: EntityId,
 403    pub timestamp: usize,
 404}
 405
 406pub struct ItemNavHistory {
 407    history: NavHistory,
 408    item: Arc<dyn WeakItemHandle>,
 409    is_preview: bool,
 410}
 411
 412#[derive(Clone)]
 413pub struct NavHistory(Arc<Mutex<NavHistoryState>>);
 414
 415struct NavHistoryState {
 416    mode: NavigationMode,
 417    backward_stack: VecDeque<NavigationEntry>,
 418    forward_stack: VecDeque<NavigationEntry>,
 419    closed_stack: VecDeque<NavigationEntry>,
 420    paths_by_item: HashMap<EntityId, (ProjectPath, Option<PathBuf>)>,
 421    pane: WeakEntity<Pane>,
 422    next_timestamp: Arc<AtomicUsize>,
 423}
 424
 425#[derive(Debug, Copy, Clone)]
 426pub enum NavigationMode {
 427    Normal,
 428    GoingBack,
 429    GoingForward,
 430    ClosingItem,
 431    ReopeningClosedItem,
 432    Disabled,
 433}
 434
 435impl Default for NavigationMode {
 436    fn default() -> Self {
 437        Self::Normal
 438    }
 439}
 440
 441pub struct NavigationEntry {
 442    pub item: Arc<dyn WeakItemHandle>,
 443    pub data: Option<Box<dyn Any + Send>>,
 444    pub timestamp: usize,
 445    pub is_preview: bool,
 446}
 447
 448#[derive(Clone)]
 449pub struct DraggedTab {
 450    pub pane: Entity<Pane>,
 451    pub item: Box<dyn ItemHandle>,
 452    pub ix: usize,
 453    pub detail: usize,
 454    pub is_active: bool,
 455}
 456
 457impl EventEmitter<Event> for Pane {}
 458
 459pub enum Side {
 460    Left,
 461    Right,
 462}
 463
 464#[derive(Copy, Clone)]
 465enum PinOperation {
 466    Pin,
 467    Unpin,
 468}
 469
 470impl Pane {
 471    pub fn new(
 472        workspace: WeakEntity<Workspace>,
 473        project: Entity<Project>,
 474        next_timestamp: Arc<AtomicUsize>,
 475        can_drop_predicate: Option<Arc<dyn Fn(&dyn Any, &mut Window, &mut App) -> bool + 'static>>,
 476        double_click_dispatch_action: Box<dyn Action>,
 477        use_max_tabs: bool,
 478        window: &mut Window,
 479        cx: &mut Context<Self>,
 480    ) -> Self {
 481        let focus_handle = cx.focus_handle();
 482        let max_tabs = if use_max_tabs {
 483            WorkspaceSettings::get_global(cx).max_tabs
 484        } else {
 485            None
 486        };
 487
 488        let subscriptions = vec![
 489            cx.on_focus(&focus_handle, window, Pane::focus_in),
 490            cx.on_focus_in(&focus_handle, window, Pane::focus_in),
 491            cx.on_focus_out(&focus_handle, window, Pane::focus_out),
 492            cx.observe_global_in::<SettingsStore>(window, Self::settings_changed),
 493            cx.subscribe(&project, Self::project_events),
 494        ];
 495
 496        let handle = cx.entity().downgrade();
 497
 498        Self {
 499            alternate_file_items: (None, None),
 500            focus_handle,
 501            items: Vec::new(),
 502            activation_history: Vec::new(),
 503            next_activation_timestamp: next_timestamp.clone(),
 504            was_focused: false,
 505            zoomed: false,
 506            active_item_index: 0,
 507            preview_item_id: None,
 508            max_tabs,
 509            use_max_tabs,
 510            last_focus_handle_by_item: Default::default(),
 511            nav_history: NavHistory(Arc::new(Mutex::new(NavHistoryState {
 512                mode: NavigationMode::Normal,
 513                backward_stack: Default::default(),
 514                forward_stack: Default::default(),
 515                closed_stack: Default::default(),
 516                paths_by_item: Default::default(),
 517                pane: handle,
 518                next_timestamp,
 519            }))),
 520            toolbar: cx.new(|_| Toolbar::new()),
 521            tab_bar_scroll_handle: ScrollHandle::new(),
 522            suppress_scroll: false,
 523            drag_split_direction: None,
 524            workspace,
 525            project: project.downgrade(),
 526            can_drop_predicate,
 527            custom_drop_handle: None,
 528            can_split_predicate: None,
 529            can_toggle_zoom: true,
 530            should_display_tab_bar: Rc::new(|_, cx| TabBarSettings::get_global(cx).show),
 531            render_tab_bar_buttons: Rc::new(default_render_tab_bar_buttons),
 532            render_tab_bar: Rc::new(Self::render_tab_bar),
 533            show_tab_bar_buttons: TabBarSettings::get_global(cx).show_tab_bar_buttons,
 534            display_nav_history_buttons: Some(
 535                TabBarSettings::get_global(cx).show_nav_history_buttons,
 536            ),
 537            _subscriptions: subscriptions,
 538            double_click_dispatch_action,
 539            save_modals_spawned: HashSet::default(),
 540            close_pane_if_empty: true,
 541            split_item_context_menu_handle: Default::default(),
 542            new_item_context_menu_handle: Default::default(),
 543            pinned_tab_count: 0,
 544            diagnostics: Default::default(),
 545            zoom_out_on_close: true,
 546            diagnostic_summary_update: Task::ready(()),
 547            project_item_restoration_data: HashMap::default(),
 548        }
 549    }
 550
 551    fn alternate_file(&mut self, _: &AlternateFile, window: &mut Window, cx: &mut Context<Pane>) {
 552        let (_, alternative) = &self.alternate_file_items;
 553        if let Some(alternative) = alternative {
 554            let existing = self
 555                .items()
 556                .find_position(|item| item.item_id() == alternative.id());
 557            if let Some((ix, _)) = existing {
 558                self.activate_item(ix, true, true, window, cx);
 559            } else if let Some(upgraded) = alternative.upgrade() {
 560                self.add_item(upgraded, true, true, None, window, cx);
 561            }
 562        }
 563    }
 564
 565    pub fn track_alternate_file_items(&mut self) {
 566        if let Some(item) = self.active_item().map(|item| item.downgrade_item()) {
 567            let (current, _) = &self.alternate_file_items;
 568            match current {
 569                Some(current) => {
 570                    if current.id() != item.id() {
 571                        self.alternate_file_items =
 572                            (Some(item), self.alternate_file_items.0.take());
 573                    }
 574                }
 575                None => {
 576                    self.alternate_file_items = (Some(item), None);
 577                }
 578            }
 579        }
 580    }
 581
 582    pub fn has_focus(&self, window: &Window, cx: &App) -> bool {
 583        // We not only check whether our focus handle contains focus, but also
 584        // whether the active item might have focus, because we might have just activated an item
 585        // that hasn't rendered yet.
 586        // Before the next render, we might transfer focus
 587        // to the item, and `focus_handle.contains_focus` returns false because the `active_item`
 588        // is not hooked up to us in the dispatch tree.
 589        self.focus_handle.contains_focused(window, cx)
 590            || self
 591                .active_item()
 592                .is_some_and(|item| item.item_focus_handle(cx).contains_focused(window, cx))
 593    }
 594
 595    fn focus_in(&mut self, window: &mut Window, cx: &mut Context<Self>) {
 596        if !self.was_focused {
 597            self.was_focused = true;
 598            self.update_history(self.active_item_index);
 599            if !self.suppress_scroll && self.items.get(self.active_item_index).is_some() {
 600                self.update_active_tab(self.active_item_index);
 601            }
 602            cx.emit(Event::Focus);
 603            cx.notify();
 604        }
 605
 606        self.toolbar.update(cx, |toolbar, cx| {
 607            toolbar.focus_changed(true, window, cx);
 608        });
 609
 610        if let Some(active_item) = self.active_item() {
 611            if self.focus_handle.is_focused(window) {
 612                // Schedule a redraw next frame, so that the focus changes below take effect
 613                cx.on_next_frame(window, |_, _, cx| {
 614                    cx.notify();
 615                });
 616
 617                // Pane was focused directly. We need to either focus a view inside the active item,
 618                // or focus the active item itself
 619                if let Some(weak_last_focus_handle) =
 620                    self.last_focus_handle_by_item.get(&active_item.item_id())
 621                    && let Some(focus_handle) = weak_last_focus_handle.upgrade()
 622                {
 623                    focus_handle.focus(window);
 624                    return;
 625                }
 626
 627                active_item.item_focus_handle(cx).focus(window);
 628            } else if let Some(focused) = window.focused(cx)
 629                && !self.context_menu_focused(window, cx)
 630            {
 631                self.last_focus_handle_by_item
 632                    .insert(active_item.item_id(), focused.downgrade());
 633            }
 634        }
 635    }
 636
 637    pub fn context_menu_focused(&self, window: &mut Window, cx: &mut Context<Self>) -> bool {
 638        self.new_item_context_menu_handle.is_focused(window, cx)
 639            || self.split_item_context_menu_handle.is_focused(window, cx)
 640    }
 641
 642    fn focus_out(&mut self, _event: FocusOutEvent, window: &mut Window, cx: &mut Context<Self>) {
 643        self.was_focused = false;
 644        self.toolbar.update(cx, |toolbar, cx| {
 645            toolbar.focus_changed(false, window, cx);
 646        });
 647
 648        cx.notify();
 649    }
 650
 651    fn project_events(
 652        &mut self,
 653        _project: Entity<Project>,
 654        event: &project::Event,
 655        cx: &mut Context<Self>,
 656    ) {
 657        match event {
 658            project::Event::DiskBasedDiagnosticsFinished { .. }
 659            | project::Event::DiagnosticsUpdated { .. } => {
 660                if ItemSettings::get_global(cx).show_diagnostics != ShowDiagnostics::Off {
 661                    self.diagnostic_summary_update = cx.spawn(async move |this, cx| {
 662                        cx.background_executor()
 663                            .timer(Duration::from_millis(30))
 664                            .await;
 665                        this.update(cx, |this, cx| {
 666                            this.update_diagnostics(cx);
 667                            cx.notify();
 668                        })
 669                        .log_err();
 670                    });
 671                }
 672            }
 673            _ => {}
 674        }
 675    }
 676
 677    fn update_diagnostics(&mut self, cx: &mut Context<Self>) {
 678        let Some(project) = self.project.upgrade() else {
 679            return;
 680        };
 681        let show_diagnostics = ItemSettings::get_global(cx).show_diagnostics;
 682        self.diagnostics = if show_diagnostics != ShowDiagnostics::Off {
 683            project
 684                .read(cx)
 685                .diagnostic_summaries(false, cx)
 686                .filter_map(|(project_path, _, diagnostic_summary)| {
 687                    if diagnostic_summary.error_count > 0 {
 688                        Some((project_path, DiagnosticSeverity::ERROR))
 689                    } else if diagnostic_summary.warning_count > 0
 690                        && show_diagnostics != ShowDiagnostics::Errors
 691                    {
 692                        Some((project_path, DiagnosticSeverity::WARNING))
 693                    } else {
 694                        None
 695                    }
 696                })
 697                .collect()
 698        } else {
 699            HashMap::default()
 700        }
 701    }
 702
 703    fn settings_changed(&mut self, window: &mut Window, cx: &mut Context<Self>) {
 704        let tab_bar_settings = TabBarSettings::get_global(cx);
 705        let new_max_tabs = WorkspaceSettings::get_global(cx).max_tabs;
 706
 707        if let Some(display_nav_history_buttons) = self.display_nav_history_buttons.as_mut() {
 708            *display_nav_history_buttons = tab_bar_settings.show_nav_history_buttons;
 709        }
 710
 711        self.show_tab_bar_buttons = tab_bar_settings.show_tab_bar_buttons;
 712
 713        if !PreviewTabsSettings::get_global(cx).enabled {
 714            self.preview_item_id = None;
 715        }
 716
 717        if self.use_max_tabs && new_max_tabs != self.max_tabs {
 718            self.max_tabs = new_max_tabs;
 719            self.close_items_on_settings_change(window, cx);
 720        }
 721
 722        self.update_diagnostics(cx);
 723        cx.notify();
 724    }
 725
 726    pub fn active_item_index(&self) -> usize {
 727        self.active_item_index
 728    }
 729
 730    pub fn activation_history(&self) -> &[ActivationHistoryEntry] {
 731        &self.activation_history
 732    }
 733
 734    pub fn set_should_display_tab_bar<F>(&mut self, should_display_tab_bar: F)
 735    where
 736        F: 'static + Fn(&Window, &mut Context<Pane>) -> bool,
 737    {
 738        self.should_display_tab_bar = Rc::new(should_display_tab_bar);
 739    }
 740
 741    pub fn set_can_split(
 742        &mut self,
 743        can_split_predicate: Option<
 744            Arc<dyn Fn(&mut Self, &dyn Any, &mut Window, &mut Context<Self>) -> bool + 'static>,
 745        >,
 746    ) {
 747        self.can_split_predicate = can_split_predicate;
 748    }
 749
 750    pub fn set_can_toggle_zoom(&mut self, can_toggle_zoom: bool, cx: &mut Context<Self>) {
 751        self.can_toggle_zoom = can_toggle_zoom;
 752        cx.notify();
 753    }
 754
 755    pub fn set_close_pane_if_empty(&mut self, close_pane_if_empty: bool, cx: &mut Context<Self>) {
 756        self.close_pane_if_empty = close_pane_if_empty;
 757        cx.notify();
 758    }
 759
 760    pub fn set_can_navigate(&mut self, can_navigate: bool, cx: &mut Context<Self>) {
 761        self.toolbar.update(cx, |toolbar, cx| {
 762            toolbar.set_can_navigate(can_navigate, cx);
 763        });
 764        cx.notify();
 765    }
 766
 767    pub fn set_render_tab_bar<F>(&mut self, cx: &mut Context<Self>, render: F)
 768    where
 769        F: 'static + Fn(&mut Pane, &mut Window, &mut Context<Pane>) -> AnyElement,
 770    {
 771        self.render_tab_bar = Rc::new(render);
 772        cx.notify();
 773    }
 774
 775    pub fn set_render_tab_bar_buttons<F>(&mut self, cx: &mut Context<Self>, render: F)
 776    where
 777        F: 'static
 778            + Fn(
 779                &mut Pane,
 780                &mut Window,
 781                &mut Context<Pane>,
 782            ) -> (Option<AnyElement>, Option<AnyElement>),
 783    {
 784        self.render_tab_bar_buttons = Rc::new(render);
 785        cx.notify();
 786    }
 787
 788    pub fn set_custom_drop_handle<F>(&mut self, cx: &mut Context<Self>, handle: F)
 789    where
 790        F: 'static
 791            + Fn(&mut Pane, &dyn Any, &mut Window, &mut Context<Pane>) -> ControlFlow<(), ()>,
 792    {
 793        self.custom_drop_handle = Some(Arc::new(handle));
 794        cx.notify();
 795    }
 796
 797    pub fn nav_history_for_item<T: Item>(&self, item: &Entity<T>) -> ItemNavHistory {
 798        ItemNavHistory {
 799            history: self.nav_history.clone(),
 800            item: Arc::new(item.downgrade()),
 801            is_preview: self.preview_item_id == Some(item.item_id()),
 802        }
 803    }
 804
 805    pub fn nav_history(&self) -> &NavHistory {
 806        &self.nav_history
 807    }
 808
 809    pub fn nav_history_mut(&mut self) -> &mut NavHistory {
 810        &mut self.nav_history
 811    }
 812
 813    pub fn disable_history(&mut self) {
 814        self.nav_history.disable();
 815    }
 816
 817    pub fn enable_history(&mut self) {
 818        self.nav_history.enable();
 819    }
 820
 821    pub fn can_navigate_backward(&self) -> bool {
 822        !self.nav_history.0.lock().backward_stack.is_empty()
 823    }
 824
 825    pub fn can_navigate_forward(&self) -> bool {
 826        !self.nav_history.0.lock().forward_stack.is_empty()
 827    }
 828
 829    pub fn navigate_backward(&mut self, _: &GoBack, window: &mut Window, cx: &mut Context<Self>) {
 830        if let Some(workspace) = self.workspace.upgrade() {
 831            let pane = cx.entity().downgrade();
 832            window.defer(cx, move |window, cx| {
 833                workspace.update(cx, |workspace, cx| {
 834                    workspace.go_back(pane, window, cx).detach_and_log_err(cx)
 835                })
 836            })
 837        }
 838    }
 839
 840    fn navigate_forward(&mut self, _: &GoForward, window: &mut Window, cx: &mut Context<Self>) {
 841        if let Some(workspace) = self.workspace.upgrade() {
 842            let pane = cx.entity().downgrade();
 843            window.defer(cx, move |window, cx| {
 844                workspace.update(cx, |workspace, cx| {
 845                    workspace
 846                        .go_forward(pane, window, cx)
 847                        .detach_and_log_err(cx)
 848                })
 849            })
 850        }
 851    }
 852
 853    fn history_updated(&mut self, cx: &mut Context<Self>) {
 854        self.toolbar.update(cx, |_, cx| cx.notify());
 855    }
 856
 857    pub fn preview_item_id(&self) -> Option<EntityId> {
 858        self.preview_item_id
 859    }
 860
 861    pub fn preview_item(&self) -> Option<Box<dyn ItemHandle>> {
 862        self.preview_item_id
 863            .and_then(|id| self.items.iter().find(|item| item.item_id() == id))
 864            .cloned()
 865    }
 866
 867    pub fn preview_item_idx(&self) -> Option<usize> {
 868        if let Some(preview_item_id) = self.preview_item_id {
 869            self.items
 870                .iter()
 871                .position(|item| item.item_id() == preview_item_id)
 872        } else {
 873            None
 874        }
 875    }
 876
 877    pub fn is_active_preview_item(&self, item_id: EntityId) -> bool {
 878        self.preview_item_id == Some(item_id)
 879    }
 880
 881    /// Marks the item with the given ID as the preview item.
 882    /// This will be ignored if the global setting `preview_tabs` is disabled.
 883    pub fn set_preview_item_id(&mut self, item_id: Option<EntityId>, cx: &App) {
 884        if PreviewTabsSettings::get_global(cx).enabled {
 885            self.preview_item_id = item_id;
 886        }
 887    }
 888
 889    /// Should only be used when deserializing a pane.
 890    pub fn set_pinned_count(&mut self, count: usize) {
 891        self.pinned_tab_count = count;
 892    }
 893
 894    pub fn pinned_count(&self) -> usize {
 895        self.pinned_tab_count
 896    }
 897
 898    pub fn handle_item_edit(&mut self, item_id: EntityId, cx: &App) {
 899        if let Some(preview_item) = self.preview_item()
 900            && preview_item.item_id() == item_id
 901            && !preview_item.preserve_preview(cx)
 902        {
 903            self.set_preview_item_id(None, cx);
 904        }
 905    }
 906
 907    pub(crate) fn open_item(
 908        &mut self,
 909        project_entry_id: Option<ProjectEntryId>,
 910        project_path: ProjectPath,
 911        focus_item: bool,
 912        allow_preview: bool,
 913        activate: bool,
 914        suggested_position: Option<usize>,
 915        window: &mut Window,
 916        cx: &mut Context<Self>,
 917        build_item: WorkspaceItemBuilder,
 918    ) -> Box<dyn ItemHandle> {
 919        let mut existing_item = None;
 920        if let Some(project_entry_id) = project_entry_id {
 921            for (index, item) in self.items.iter().enumerate() {
 922                if item.buffer_kind(cx) == ItemBufferKind::Singleton
 923                    && item.project_entry_ids(cx).as_slice() == [project_entry_id]
 924                {
 925                    let item = item.boxed_clone();
 926                    existing_item = Some((index, item));
 927                    break;
 928                }
 929            }
 930        } else {
 931            for (index, item) in self.items.iter().enumerate() {
 932                if item.buffer_kind(cx) == ItemBufferKind::Singleton
 933                    && item.project_path(cx).as_ref() == Some(&project_path)
 934                {
 935                    let item = item.boxed_clone();
 936                    existing_item = Some((index, item));
 937                    break;
 938                }
 939            }
 940        }
 941
 942        let set_up_existing_item =
 943            |index: usize, pane: &mut Self, window: &mut Window, cx: &mut Context<Self>| {
 944                // If the item is already open, and the item is a preview item
 945                // and we are not allowing items to open as preview, mark the item as persistent.
 946                if let Some(preview_item_id) = pane.preview_item_id
 947                    && let Some(tab) = pane.items.get(index)
 948                    && tab.item_id() == preview_item_id
 949                    && !allow_preview
 950                {
 951                    pane.set_preview_item_id(None, cx);
 952                }
 953                if activate {
 954                    pane.activate_item(index, focus_item, focus_item, window, cx);
 955                }
 956            };
 957        let set_up_new_item = |new_item: Box<dyn ItemHandle>,
 958                               destination_index: Option<usize>,
 959                               pane: &mut Self,
 960                               window: &mut Window,
 961                               cx: &mut Context<Self>| {
 962            if allow_preview {
 963                pane.set_preview_item_id(Some(new_item.item_id()), cx);
 964            }
 965
 966            if let Some(text) = new_item.telemetry_event_text(cx) {
 967                telemetry::event!(text);
 968            }
 969
 970            pane.add_item_inner(
 971                new_item,
 972                true,
 973                focus_item,
 974                activate,
 975                destination_index,
 976                window,
 977                cx,
 978            );
 979        };
 980
 981        if let Some((index, existing_item)) = existing_item {
 982            set_up_existing_item(index, self, window, cx);
 983            existing_item
 984        } else {
 985            // If the item is being opened as preview and we have an existing preview tab,
 986            // open the new item in the position of the existing preview tab.
 987            let destination_index = if allow_preview {
 988                self.close_current_preview_item(window, cx)
 989            } else {
 990                suggested_position
 991            };
 992
 993            let new_item = build_item(self, window, cx);
 994            // A special case that won't ever get a `project_entry_id` but has to be deduplicated nonetheless.
 995            if let Some(invalid_buffer_view) = new_item.downcast::<InvalidItemView>() {
 996                let mut already_open_view = None;
 997                let mut views_to_close = HashSet::default();
 998                for existing_error_view in self
 999                    .items_of_type::<InvalidItemView>()
1000                    .filter(|item| item.read(cx).abs_path == invalid_buffer_view.read(cx).abs_path)
1001                {
1002                    if already_open_view.is_none()
1003                        && existing_error_view.read(cx).error == invalid_buffer_view.read(cx).error
1004                    {
1005                        already_open_view = Some(existing_error_view);
1006                    } else {
1007                        views_to_close.insert(existing_error_view.item_id());
1008                    }
1009                }
1010
1011                let resulting_item = match already_open_view {
1012                    Some(already_open_view) => {
1013                        if let Some(index) = self.index_for_item_id(already_open_view.item_id()) {
1014                            set_up_existing_item(index, self, window, cx);
1015                        }
1016                        Box::new(already_open_view) as Box<_>
1017                    }
1018                    None => {
1019                        set_up_new_item(new_item.clone(), destination_index, self, window, cx);
1020                        new_item
1021                    }
1022                };
1023
1024                self.close_items(window, cx, SaveIntent::Skip, |existing_item| {
1025                    views_to_close.contains(&existing_item)
1026                })
1027                .detach();
1028
1029                resulting_item
1030            } else {
1031                set_up_new_item(new_item.clone(), destination_index, self, window, cx);
1032                new_item
1033            }
1034        }
1035    }
1036
1037    pub fn close_current_preview_item(
1038        &mut self,
1039        window: &mut Window,
1040        cx: &mut Context<Self>,
1041    ) -> Option<usize> {
1042        let item_idx = self.preview_item_idx()?;
1043        let id = self.preview_item_id()?;
1044
1045        let prev_active_item_index = self.active_item_index;
1046        self.remove_item(id, false, false, window, cx);
1047        self.active_item_index = prev_active_item_index;
1048
1049        if item_idx < self.items.len() {
1050            Some(item_idx)
1051        } else {
1052            None
1053        }
1054    }
1055
1056    pub fn add_item_inner(
1057        &mut self,
1058        item: Box<dyn ItemHandle>,
1059        activate_pane: bool,
1060        focus_item: bool,
1061        activate: bool,
1062        destination_index: Option<usize>,
1063        window: &mut Window,
1064        cx: &mut Context<Self>,
1065    ) {
1066        let item_already_exists = self
1067            .items
1068            .iter()
1069            .any(|existing_item| existing_item.item_id() == item.item_id());
1070
1071        if !item_already_exists {
1072            self.close_items_on_item_open(window, cx);
1073        }
1074
1075        if item.buffer_kind(cx) == ItemBufferKind::Singleton
1076            && let Some(&entry_id) = item.project_entry_ids(cx).first()
1077        {
1078            let Some(project) = self.project.upgrade() else {
1079                return;
1080            };
1081
1082            let project = project.read(cx);
1083            if let Some(project_path) = project.path_for_entry(entry_id, cx) {
1084                let abs_path = project.absolute_path(&project_path, cx);
1085                self.nav_history
1086                    .0
1087                    .lock()
1088                    .paths_by_item
1089                    .insert(item.item_id(), (project_path, abs_path));
1090            }
1091        }
1092        // If no destination index is specified, add or move the item after the
1093        // active item (or at the start of tab bar, if the active item is pinned)
1094        let mut insertion_index = {
1095            cmp::min(
1096                if let Some(destination_index) = destination_index {
1097                    destination_index
1098                } else {
1099                    cmp::max(self.active_item_index + 1, self.pinned_count())
1100                },
1101                self.items.len(),
1102            )
1103        };
1104
1105        // Does the item already exist?
1106        let project_entry_id = if item.buffer_kind(cx) == ItemBufferKind::Singleton {
1107            item.project_entry_ids(cx).first().copied()
1108        } else {
1109            None
1110        };
1111
1112        let existing_item_index = self.items.iter().position(|existing_item| {
1113            if existing_item.item_id() == item.item_id() {
1114                true
1115            } else if existing_item.buffer_kind(cx) == ItemBufferKind::Singleton {
1116                existing_item
1117                    .project_entry_ids(cx)
1118                    .first()
1119                    .is_some_and(|existing_entry_id| {
1120                        Some(existing_entry_id) == project_entry_id.as_ref()
1121                    })
1122            } else {
1123                false
1124            }
1125        });
1126
1127        if let Some(existing_item_index) = existing_item_index {
1128            // If the item already exists, move it to the desired destination and activate it
1129
1130            if existing_item_index != insertion_index {
1131                let existing_item_is_active = existing_item_index == self.active_item_index;
1132
1133                // If the caller didn't specify a destination and the added item is already
1134                // the active one, don't move it
1135                if existing_item_is_active && destination_index.is_none() {
1136                    insertion_index = existing_item_index;
1137                } else {
1138                    self.items.remove(existing_item_index);
1139                    if existing_item_index < self.active_item_index {
1140                        self.active_item_index -= 1;
1141                    }
1142                    insertion_index = insertion_index.min(self.items.len());
1143
1144                    self.items.insert(insertion_index, item.clone());
1145
1146                    if existing_item_is_active {
1147                        self.active_item_index = insertion_index;
1148                    } else if insertion_index <= self.active_item_index {
1149                        self.active_item_index += 1;
1150                    }
1151                }
1152
1153                cx.notify();
1154            }
1155
1156            if activate {
1157                self.activate_item(insertion_index, activate_pane, focus_item, window, cx);
1158            }
1159        } else {
1160            self.items.insert(insertion_index, item.clone());
1161            cx.notify();
1162
1163            if activate {
1164                if insertion_index <= self.active_item_index
1165                    && self.preview_item_idx() != Some(self.active_item_index)
1166                {
1167                    self.active_item_index += 1;
1168                }
1169
1170                self.activate_item(insertion_index, activate_pane, focus_item, window, cx);
1171            }
1172        }
1173
1174        cx.emit(Event::AddItem { item });
1175    }
1176
1177    pub fn add_item(
1178        &mut self,
1179        item: Box<dyn ItemHandle>,
1180        activate_pane: bool,
1181        focus_item: bool,
1182        destination_index: Option<usize>,
1183        window: &mut Window,
1184        cx: &mut Context<Self>,
1185    ) {
1186        if let Some(text) = item.telemetry_event_text(cx) {
1187            telemetry::event!(text);
1188        }
1189
1190        self.add_item_inner(
1191            item,
1192            activate_pane,
1193            focus_item,
1194            true,
1195            destination_index,
1196            window,
1197            cx,
1198        )
1199    }
1200
1201    pub fn items_len(&self) -> usize {
1202        self.items.len()
1203    }
1204
1205    pub fn items(&self) -> impl DoubleEndedIterator<Item = &Box<dyn ItemHandle>> {
1206        self.items.iter()
1207    }
1208
1209    pub fn items_of_type<T: Render>(&self) -> impl '_ + Iterator<Item = Entity<T>> {
1210        self.items
1211            .iter()
1212            .filter_map(|item| item.to_any().downcast().ok())
1213    }
1214
1215    pub fn active_item(&self) -> Option<Box<dyn ItemHandle>> {
1216        self.items.get(self.active_item_index).cloned()
1217    }
1218
1219    fn active_item_id(&self) -> EntityId {
1220        self.items[self.active_item_index].item_id()
1221    }
1222
1223    pub fn pixel_position_of_cursor(&self, cx: &App) -> Option<Point<Pixels>> {
1224        self.items
1225            .get(self.active_item_index)?
1226            .pixel_position_of_cursor(cx)
1227    }
1228
1229    pub fn item_for_entry(
1230        &self,
1231        entry_id: ProjectEntryId,
1232        cx: &App,
1233    ) -> Option<Box<dyn ItemHandle>> {
1234        self.items.iter().find_map(|item| {
1235            if item.buffer_kind(cx) == ItemBufferKind::Singleton
1236                && (item.project_entry_ids(cx).as_slice() == [entry_id])
1237            {
1238                Some(item.boxed_clone())
1239            } else {
1240                None
1241            }
1242        })
1243    }
1244
1245    pub fn item_for_path(
1246        &self,
1247        project_path: ProjectPath,
1248        cx: &App,
1249    ) -> Option<Box<dyn ItemHandle>> {
1250        self.items.iter().find_map(move |item| {
1251            if item.buffer_kind(cx) == ItemBufferKind::Singleton
1252                && (item.project_path(cx).as_slice() == [project_path.clone()])
1253            {
1254                Some(item.boxed_clone())
1255            } else {
1256                None
1257            }
1258        })
1259    }
1260
1261    pub fn index_for_item(&self, item: &dyn ItemHandle) -> Option<usize> {
1262        self.index_for_item_id(item.item_id())
1263    }
1264
1265    fn index_for_item_id(&self, item_id: EntityId) -> Option<usize> {
1266        self.items.iter().position(|i| i.item_id() == item_id)
1267    }
1268
1269    pub fn item_for_index(&self, ix: usize) -> Option<&dyn ItemHandle> {
1270        self.items.get(ix).map(|i| i.as_ref())
1271    }
1272
1273    pub fn toggle_zoom(&mut self, _: &ToggleZoom, window: &mut Window, cx: &mut Context<Self>) {
1274        if !self.can_toggle_zoom {
1275            cx.propagate();
1276        } else if self.zoomed {
1277            cx.emit(Event::ZoomOut);
1278        } else if !self.items.is_empty() {
1279            if !self.focus_handle.contains_focused(window, cx) {
1280                cx.focus_self(window);
1281            }
1282            cx.emit(Event::ZoomIn);
1283        }
1284    }
1285
1286    pub fn activate_item(
1287        &mut self,
1288        index: usize,
1289        activate_pane: bool,
1290        focus_item: bool,
1291        window: &mut Window,
1292        cx: &mut Context<Self>,
1293    ) {
1294        use NavigationMode::{GoingBack, GoingForward};
1295        if index < self.items.len() {
1296            let prev_active_item_ix = mem::replace(&mut self.active_item_index, index);
1297            if (prev_active_item_ix != self.active_item_index
1298                || matches!(self.nav_history.mode(), GoingBack | GoingForward))
1299                && let Some(prev_item) = self.items.get(prev_active_item_ix)
1300            {
1301                prev_item.deactivated(window, cx);
1302            }
1303            self.update_history(index);
1304            self.update_toolbar(window, cx);
1305            self.update_status_bar(window, cx);
1306
1307            if focus_item {
1308                self.focus_active_item(window, cx);
1309            }
1310
1311            cx.emit(Event::ActivateItem {
1312                local: activate_pane,
1313                focus_changed: focus_item,
1314            });
1315
1316            self.update_active_tab(index);
1317            cx.notify();
1318        }
1319    }
1320
1321    fn update_active_tab(&mut self, index: usize) {
1322        if !self.is_tab_pinned(index) {
1323            self.suppress_scroll = false;
1324            self.tab_bar_scroll_handle.scroll_to_item(index);
1325        }
1326    }
1327
1328    fn update_history(&mut self, index: usize) {
1329        if let Some(newly_active_item) = self.items.get(index) {
1330            self.activation_history
1331                .retain(|entry| entry.entity_id != newly_active_item.item_id());
1332            self.activation_history.push(ActivationHistoryEntry {
1333                entity_id: newly_active_item.item_id(),
1334                timestamp: self
1335                    .next_activation_timestamp
1336                    .fetch_add(1, Ordering::SeqCst),
1337            });
1338        }
1339    }
1340
1341    pub fn activate_previous_item(
1342        &mut self,
1343        _: &ActivatePreviousItem,
1344        window: &mut Window,
1345        cx: &mut Context<Self>,
1346    ) {
1347        let mut index = self.active_item_index;
1348        if index > 0 {
1349            index -= 1;
1350        } else if !self.items.is_empty() {
1351            index = self.items.len() - 1;
1352        }
1353        self.activate_item(index, true, true, window, cx);
1354    }
1355
1356    pub fn activate_next_item(
1357        &mut self,
1358        _: &ActivateNextItem,
1359        window: &mut Window,
1360        cx: &mut Context<Self>,
1361    ) {
1362        let mut index = self.active_item_index;
1363        if index + 1 < self.items.len() {
1364            index += 1;
1365        } else {
1366            index = 0;
1367        }
1368        self.activate_item(index, true, true, window, cx);
1369    }
1370
1371    pub fn swap_item_left(
1372        &mut self,
1373        _: &SwapItemLeft,
1374        window: &mut Window,
1375        cx: &mut Context<Self>,
1376    ) {
1377        let index = self.active_item_index;
1378        if index == 0 {
1379            return;
1380        }
1381
1382        self.items.swap(index, index - 1);
1383        self.activate_item(index - 1, true, true, window, cx);
1384    }
1385
1386    pub fn swap_item_right(
1387        &mut self,
1388        _: &SwapItemRight,
1389        window: &mut Window,
1390        cx: &mut Context<Self>,
1391    ) {
1392        let index = self.active_item_index;
1393        if index + 1 >= self.items.len() {
1394            return;
1395        }
1396
1397        self.items.swap(index, index + 1);
1398        self.activate_item(index + 1, true, true, window, cx);
1399    }
1400
1401    pub fn activate_last_item(
1402        &mut self,
1403        _: &ActivateLastItem,
1404        window: &mut Window,
1405        cx: &mut Context<Self>,
1406    ) {
1407        let index = self.items.len().saturating_sub(1);
1408        self.activate_item(index, true, true, window, cx);
1409    }
1410
1411    pub fn close_active_item(
1412        &mut self,
1413        action: &CloseActiveItem,
1414        window: &mut Window,
1415        cx: &mut Context<Self>,
1416    ) -> Task<Result<()>> {
1417        if self.items.is_empty() {
1418            // Close the window when there's no active items to close, if configured
1419            if WorkspaceSettings::get_global(cx)
1420                .when_closing_with_no_tabs
1421                .should_close()
1422            {
1423                window.dispatch_action(Box::new(CloseWindow), cx);
1424            }
1425
1426            return Task::ready(Ok(()));
1427        }
1428        if self.is_tab_pinned(self.active_item_index) && !action.close_pinned {
1429            // Activate any non-pinned tab in same pane
1430            let non_pinned_tab_index = self
1431                .items()
1432                .enumerate()
1433                .find(|(index, _item)| !self.is_tab_pinned(*index))
1434                .map(|(index, _item)| index);
1435            if let Some(index) = non_pinned_tab_index {
1436                self.activate_item(index, false, false, window, cx);
1437                return Task::ready(Ok(()));
1438            }
1439
1440            // Activate any non-pinned tab in different pane
1441            let current_pane = cx.entity();
1442            self.workspace
1443                .update(cx, |workspace, cx| {
1444                    let panes = workspace.center.panes();
1445                    let pane_with_unpinned_tab = panes.iter().find(|pane| {
1446                        if **pane == ¤t_pane {
1447                            return false;
1448                        }
1449                        pane.read(cx).has_unpinned_tabs()
1450                    });
1451                    if let Some(pane) = pane_with_unpinned_tab {
1452                        pane.update(cx, |pane, cx| pane.activate_unpinned_tab(window, cx));
1453                    }
1454                })
1455                .ok();
1456
1457            return Task::ready(Ok(()));
1458        };
1459
1460        let active_item_id = self.active_item_id();
1461
1462        self.close_item_by_id(
1463            active_item_id,
1464            action.save_intent.unwrap_or(SaveIntent::Close),
1465            window,
1466            cx,
1467        )
1468    }
1469
1470    pub fn close_item_by_id(
1471        &mut self,
1472        item_id_to_close: EntityId,
1473        save_intent: SaveIntent,
1474        window: &mut Window,
1475        cx: &mut Context<Self>,
1476    ) -> Task<Result<()>> {
1477        self.close_items(window, cx, save_intent, move |view_id| {
1478            view_id == item_id_to_close
1479        })
1480    }
1481
1482    pub fn close_other_items(
1483        &mut self,
1484        action: &CloseOtherItems,
1485        target_item_id: Option<EntityId>,
1486        window: &mut Window,
1487        cx: &mut Context<Self>,
1488    ) -> Task<Result<()>> {
1489        if self.items.is_empty() {
1490            return Task::ready(Ok(()));
1491        }
1492
1493        let active_item_id = match target_item_id {
1494            Some(result) => result,
1495            None => self.active_item_id(),
1496        };
1497
1498        let pinned_item_ids = self.pinned_item_ids();
1499
1500        self.close_items(
1501            window,
1502            cx,
1503            action.save_intent.unwrap_or(SaveIntent::Close),
1504            move |item_id| {
1505                item_id != active_item_id
1506                    && (action.close_pinned || !pinned_item_ids.contains(&item_id))
1507            },
1508        )
1509    }
1510
1511    pub fn close_multibuffer_items(
1512        &mut self,
1513        action: &CloseMultibufferItems,
1514        window: &mut Window,
1515        cx: &mut Context<Self>,
1516    ) -> Task<Result<()>> {
1517        if self.items.is_empty() {
1518            return Task::ready(Ok(()));
1519        }
1520
1521        let pinned_item_ids = self.pinned_item_ids();
1522        let multibuffer_items = self.multibuffer_item_ids(cx);
1523
1524        self.close_items(
1525            window,
1526            cx,
1527            action.save_intent.unwrap_or(SaveIntent::Close),
1528            move |item_id| {
1529                (action.close_pinned || !pinned_item_ids.contains(&item_id))
1530                    && multibuffer_items.contains(&item_id)
1531            },
1532        )
1533    }
1534
1535    pub fn close_clean_items(
1536        &mut self,
1537        action: &CloseCleanItems,
1538        window: &mut Window,
1539        cx: &mut Context<Self>,
1540    ) -> Task<Result<()>> {
1541        if self.items.is_empty() {
1542            return Task::ready(Ok(()));
1543        }
1544
1545        let clean_item_ids = self.clean_item_ids(cx);
1546        let pinned_item_ids = self.pinned_item_ids();
1547
1548        self.close_items(window, cx, SaveIntent::Close, move |item_id| {
1549            clean_item_ids.contains(&item_id)
1550                && (action.close_pinned || !pinned_item_ids.contains(&item_id))
1551        })
1552    }
1553
1554    pub fn close_items_to_the_left_by_id(
1555        &mut self,
1556        item_id: Option<EntityId>,
1557        action: &CloseItemsToTheLeft,
1558        window: &mut Window,
1559        cx: &mut Context<Self>,
1560    ) -> Task<Result<()>> {
1561        self.close_items_to_the_side_by_id(item_id, Side::Left, action.close_pinned, window, cx)
1562    }
1563
1564    pub fn close_items_to_the_right_by_id(
1565        &mut self,
1566        item_id: Option<EntityId>,
1567        action: &CloseItemsToTheRight,
1568        window: &mut Window,
1569        cx: &mut Context<Self>,
1570    ) -> Task<Result<()>> {
1571        self.close_items_to_the_side_by_id(item_id, Side::Right, action.close_pinned, window, cx)
1572    }
1573
1574    pub fn close_items_to_the_side_by_id(
1575        &mut self,
1576        item_id: Option<EntityId>,
1577        side: Side,
1578        close_pinned: bool,
1579        window: &mut Window,
1580        cx: &mut Context<Self>,
1581    ) -> Task<Result<()>> {
1582        if self.items.is_empty() {
1583            return Task::ready(Ok(()));
1584        }
1585
1586        let item_id = item_id.unwrap_or_else(|| self.active_item_id());
1587        let to_the_side_item_ids = self.to_the_side_item_ids(item_id, side);
1588        let pinned_item_ids = self.pinned_item_ids();
1589
1590        self.close_items(window, cx, SaveIntent::Close, move |item_id| {
1591            to_the_side_item_ids.contains(&item_id)
1592                && (close_pinned || !pinned_item_ids.contains(&item_id))
1593        })
1594    }
1595
1596    pub fn close_all_items(
1597        &mut self,
1598        action: &CloseAllItems,
1599        window: &mut Window,
1600        cx: &mut Context<Self>,
1601    ) -> Task<Result<()>> {
1602        if self.items.is_empty() {
1603            return Task::ready(Ok(()));
1604        }
1605
1606        let pinned_item_ids = self.pinned_item_ids();
1607
1608        self.close_items(
1609            window,
1610            cx,
1611            action.save_intent.unwrap_or(SaveIntent::Close),
1612            |item_id| action.close_pinned || !pinned_item_ids.contains(&item_id),
1613        )
1614    }
1615
1616    fn close_items_on_item_open(&mut self, window: &mut Window, cx: &mut Context<Self>) {
1617        let target = self.max_tabs.map(|m| m.get());
1618        let protect_active_item = false;
1619        self.close_items_to_target_count(target, protect_active_item, window, cx);
1620    }
1621
1622    fn close_items_on_settings_change(&mut self, window: &mut Window, cx: &mut Context<Self>) {
1623        let target = self.max_tabs.map(|m| m.get() + 1);
1624        // The active item in this case is the settings.json file, which should be protected from being closed
1625        let protect_active_item = true;
1626        self.close_items_to_target_count(target, protect_active_item, window, cx);
1627    }
1628
1629    fn close_items_to_target_count(
1630        &mut self,
1631        target_count: Option<usize>,
1632        protect_active_item: bool,
1633        window: &mut Window,
1634        cx: &mut Context<Self>,
1635    ) {
1636        let Some(target_count) = target_count else {
1637            return;
1638        };
1639
1640        let mut index_list = Vec::new();
1641        let mut items_len = self.items_len();
1642        let mut indexes: HashMap<EntityId, usize> = HashMap::default();
1643        let active_ix = self.active_item_index();
1644
1645        for (index, item) in self.items.iter().enumerate() {
1646            indexes.insert(item.item_id(), index);
1647        }
1648
1649        // Close least recently used items to reach target count.
1650        // The target count is allowed to be exceeded, as we protect pinned
1651        // items, dirty items, and sometimes, the active item.
1652        for entry in self.activation_history.iter() {
1653            if items_len < target_count {
1654                break;
1655            }
1656
1657            let Some(&index) = indexes.get(&entry.entity_id) else {
1658                continue;
1659            };
1660
1661            if protect_active_item && index == active_ix {
1662                continue;
1663            }
1664
1665            if let Some(true) = self.items.get(index).map(|item| item.is_dirty(cx)) {
1666                continue;
1667            }
1668
1669            if self.is_tab_pinned(index) {
1670                continue;
1671            }
1672
1673            index_list.push(index);
1674            items_len -= 1;
1675        }
1676        // The sort and reverse is necessary since we remove items
1677        // using their index position, hence removing from the end
1678        // of the list first to avoid changing indexes.
1679        index_list.sort_unstable();
1680        index_list
1681            .iter()
1682            .rev()
1683            .for_each(|&index| self._remove_item(index, false, false, None, window, cx));
1684    }
1685
1686    // Usually when you close an item that has unsaved changes, we prompt you to
1687    // save it. That said, if you still have the buffer open in a different pane
1688    // we can close this one without fear of losing data.
1689    pub fn skip_save_on_close(item: &dyn ItemHandle, workspace: &Workspace, cx: &App) -> bool {
1690        let mut dirty_project_item_ids = Vec::new();
1691        item.for_each_project_item(cx, &mut |project_item_id, project_item| {
1692            if project_item.is_dirty() {
1693                dirty_project_item_ids.push(project_item_id);
1694            }
1695        });
1696        if dirty_project_item_ids.is_empty() {
1697            return !(item.buffer_kind(cx) == ItemBufferKind::Singleton && item.is_dirty(cx));
1698        }
1699
1700        for open_item in workspace.items(cx) {
1701            if open_item.item_id() == item.item_id() {
1702                continue;
1703            }
1704            if open_item.buffer_kind(cx) != ItemBufferKind::Singleton {
1705                continue;
1706            }
1707            let other_project_item_ids = open_item.project_item_model_ids(cx);
1708            dirty_project_item_ids.retain(|id| !other_project_item_ids.contains(id));
1709        }
1710        dirty_project_item_ids.is_empty()
1711    }
1712
1713    pub(super) fn file_names_for_prompt(
1714        items: &mut dyn Iterator<Item = &Box<dyn ItemHandle>>,
1715        cx: &App,
1716    ) -> String {
1717        let mut file_names = BTreeSet::default();
1718        for item in items {
1719            item.for_each_project_item(cx, &mut |_, project_item| {
1720                if !project_item.is_dirty() {
1721                    return;
1722                }
1723                let filename = project_item
1724                    .project_path(cx)
1725                    .and_then(|path| path.path.file_name().map(ToOwned::to_owned));
1726                file_names.insert(filename.unwrap_or("untitled".to_string()));
1727            });
1728        }
1729        if file_names.len() > 6 {
1730            format!(
1731                "{}\n.. and {} more",
1732                file_names.iter().take(5).join("\n"),
1733                file_names.len() - 5
1734            )
1735        } else {
1736            file_names.into_iter().join("\n")
1737        }
1738    }
1739
1740    pub fn close_items(
1741        &self,
1742        window: &mut Window,
1743        cx: &mut Context<Pane>,
1744        mut save_intent: SaveIntent,
1745        should_close: impl Fn(EntityId) -> bool,
1746    ) -> Task<Result<()>> {
1747        // Find the items to close.
1748        let mut items_to_close = Vec::new();
1749        for item in &self.items {
1750            if should_close(item.item_id()) {
1751                items_to_close.push(item.boxed_clone());
1752            }
1753        }
1754
1755        let active_item_id = self.active_item().map(|item| item.item_id());
1756
1757        items_to_close.sort_by_key(|item| {
1758            let path = item.project_path(cx);
1759            // Put the currently active item at the end, because if the currently active item is not closed last
1760            // closing the currently active item will cause the focus to switch to another item
1761            // This will cause Zed to expand the content of the currently active item
1762            //
1763            // Beyond that sort in order of project path, with untitled files and multibuffers coming last.
1764            (active_item_id == Some(item.item_id()), path.is_none(), path)
1765        });
1766
1767        let workspace = self.workspace.clone();
1768        let Some(project) = self.project.upgrade() else {
1769            return Task::ready(Ok(()));
1770        };
1771        cx.spawn_in(window, async move |pane, cx| {
1772            let dirty_items = workspace.update(cx, |workspace, cx| {
1773                items_to_close
1774                    .iter()
1775                    .filter(|item| {
1776                        item.is_dirty(cx) && !Self::skip_save_on_close(item.as_ref(), workspace, cx)
1777                    })
1778                    .map(|item| item.boxed_clone())
1779                    .collect::<Vec<_>>()
1780            })?;
1781
1782            if save_intent == SaveIntent::Close && dirty_items.len() > 1 {
1783                let answer = pane.update_in(cx, |_, window, cx| {
1784                    let detail = Self::file_names_for_prompt(&mut dirty_items.iter(), cx);
1785                    window.prompt(
1786                        PromptLevel::Warning,
1787                        "Do you want to save changes to the following files?",
1788                        Some(&detail),
1789                        &["Save all", "Discard all", "Cancel"],
1790                        cx,
1791                    )
1792                })?;
1793                match answer.await {
1794                    Ok(0) => save_intent = SaveIntent::SaveAll,
1795                    Ok(1) => save_intent = SaveIntent::Skip,
1796                    Ok(2) => return Ok(()),
1797                    _ => {}
1798                }
1799            }
1800
1801            for item_to_close in items_to_close {
1802                let mut should_save = true;
1803                if save_intent == SaveIntent::Close {
1804                    workspace.update(cx, |workspace, cx| {
1805                        if Self::skip_save_on_close(item_to_close.as_ref(), workspace, cx) {
1806                            should_save = false;
1807                        }
1808                    })?;
1809                }
1810
1811                if should_save {
1812                    match Self::save_item(project.clone(), &pane, &*item_to_close, save_intent, cx)
1813                        .await
1814                    {
1815                        Ok(success) => {
1816                            if !success {
1817                                break;
1818                            }
1819                        }
1820                        Err(err) => {
1821                            let answer = pane.update_in(cx, |_, window, cx| {
1822                                let detail = Self::file_names_for_prompt(
1823                                    &mut [&item_to_close].into_iter(),
1824                                    cx,
1825                                );
1826                                window.prompt(
1827                                    PromptLevel::Warning,
1828                                    &format!("Unable to save file: {}", &err),
1829                                    Some(&detail),
1830                                    &["Close Without Saving", "Cancel"],
1831                                    cx,
1832                                )
1833                            })?;
1834                            match answer.await {
1835                                Ok(0) => {}
1836                                Ok(1..) | Err(_) => break,
1837                            }
1838                        }
1839                    }
1840                }
1841
1842                // Remove the item from the pane.
1843                pane.update_in(cx, |pane, window, cx| {
1844                    pane.remove_item(
1845                        item_to_close.item_id(),
1846                        false,
1847                        pane.close_pane_if_empty,
1848                        window,
1849                        cx,
1850                    );
1851                })
1852                .ok();
1853            }
1854
1855            pane.update(cx, |_, cx| cx.notify()).ok();
1856            Ok(())
1857        })
1858    }
1859
1860    pub fn take_active_item(
1861        &mut self,
1862        window: &mut Window,
1863        cx: &mut Context<Self>,
1864    ) -> Option<Box<dyn ItemHandle>> {
1865        let item = self.active_item()?;
1866        self.remove_item(item.item_id(), false, false, window, cx);
1867        Some(item)
1868    }
1869
1870    pub fn remove_item(
1871        &mut self,
1872        item_id: EntityId,
1873        activate_pane: bool,
1874        close_pane_if_empty: bool,
1875        window: &mut Window,
1876        cx: &mut Context<Self>,
1877    ) {
1878        let Some(item_index) = self.index_for_item_id(item_id) else {
1879            return;
1880        };
1881        self._remove_item(
1882            item_index,
1883            activate_pane,
1884            close_pane_if_empty,
1885            None,
1886            window,
1887            cx,
1888        )
1889    }
1890
1891    pub fn remove_item_and_focus_on_pane(
1892        &mut self,
1893        item_index: usize,
1894        activate_pane: bool,
1895        focus_on_pane_if_closed: Entity<Pane>,
1896        window: &mut Window,
1897        cx: &mut Context<Self>,
1898    ) {
1899        self._remove_item(
1900            item_index,
1901            activate_pane,
1902            true,
1903            Some(focus_on_pane_if_closed),
1904            window,
1905            cx,
1906        )
1907    }
1908
1909    fn _remove_item(
1910        &mut self,
1911        item_index: usize,
1912        activate_pane: bool,
1913        close_pane_if_empty: bool,
1914        focus_on_pane_if_closed: Option<Entity<Pane>>,
1915        window: &mut Window,
1916        cx: &mut Context<Self>,
1917    ) {
1918        let activate_on_close = &ItemSettings::get_global(cx).activate_on_close;
1919        self.activation_history
1920            .retain(|entry| entry.entity_id != self.items[item_index].item_id());
1921
1922        if self.is_tab_pinned(item_index) {
1923            self.pinned_tab_count -= 1;
1924        }
1925        if item_index == self.active_item_index {
1926            let left_neighbour_index = || item_index.min(self.items.len()).saturating_sub(1);
1927            let index_to_activate = match activate_on_close {
1928                ActivateOnClose::History => self
1929                    .activation_history
1930                    .pop()
1931                    .and_then(|last_activated_item| {
1932                        self.items.iter().enumerate().find_map(|(index, item)| {
1933                            (item.item_id() == last_activated_item.entity_id).then_some(index)
1934                        })
1935                    })
1936                    // We didn't have a valid activation history entry, so fallback
1937                    // to activating the item to the left
1938                    .unwrap_or_else(left_neighbour_index),
1939                ActivateOnClose::Neighbour => {
1940                    self.activation_history.pop();
1941                    if item_index + 1 < self.items.len() {
1942                        item_index + 1
1943                    } else {
1944                        item_index.saturating_sub(1)
1945                    }
1946                }
1947                ActivateOnClose::LeftNeighbour => {
1948                    self.activation_history.pop();
1949                    left_neighbour_index()
1950                }
1951            };
1952
1953            let should_activate = activate_pane || self.has_focus(window, cx);
1954            if self.items.len() == 1 && should_activate {
1955                self.focus_handle.focus(window);
1956            } else {
1957                self.activate_item(
1958                    index_to_activate,
1959                    should_activate,
1960                    should_activate,
1961                    window,
1962                    cx,
1963                );
1964            }
1965        }
1966
1967        let item = self.items.remove(item_index);
1968
1969        cx.emit(Event::RemovedItem { item: item.clone() });
1970        if self.items.is_empty() {
1971            item.deactivated(window, cx);
1972            if close_pane_if_empty {
1973                self.update_toolbar(window, cx);
1974                cx.emit(Event::Remove {
1975                    focus_on_pane: focus_on_pane_if_closed,
1976                });
1977            }
1978        }
1979
1980        if item_index < self.active_item_index {
1981            self.active_item_index -= 1;
1982        }
1983
1984        let mode = self.nav_history.mode();
1985        self.nav_history.set_mode(NavigationMode::ClosingItem);
1986        item.deactivated(window, cx);
1987        item.on_removed(cx);
1988        self.nav_history.set_mode(mode);
1989
1990        if self.is_active_preview_item(item.item_id()) {
1991            self.set_preview_item_id(None, cx);
1992        }
1993
1994        if let Some(path) = item.project_path(cx) {
1995            let abs_path = self
1996                .nav_history
1997                .0
1998                .lock()
1999                .paths_by_item
2000                .get(&item.item_id())
2001                .and_then(|(_, abs_path)| abs_path.clone());
2002
2003            self.nav_history
2004                .0
2005                .lock()
2006                .paths_by_item
2007                .insert(item.item_id(), (path, abs_path));
2008        } else {
2009            self.nav_history
2010                .0
2011                .lock()
2012                .paths_by_item
2013                .remove(&item.item_id());
2014        }
2015
2016        if self.zoom_out_on_close && self.items.is_empty() && close_pane_if_empty && self.zoomed {
2017            cx.emit(Event::ZoomOut);
2018        }
2019
2020        cx.notify();
2021    }
2022
2023    pub async fn save_item(
2024        project: Entity<Project>,
2025        pane: &WeakEntity<Pane>,
2026        item: &dyn ItemHandle,
2027        save_intent: SaveIntent,
2028        cx: &mut AsyncWindowContext,
2029    ) -> Result<bool> {
2030        const CONFLICT_MESSAGE: &str = "This file has changed on disk since you started editing it. Do you want to overwrite it?";
2031
2032        const DELETED_MESSAGE: &str = "This file has been deleted on disk since you started editing it. Do you want to recreate it?";
2033
2034        let path_style = project.read_with(cx, |project, cx| project.path_style(cx))?;
2035        if save_intent == SaveIntent::Skip {
2036            return Ok(true);
2037        };
2038        let Some(item_ix) = pane
2039            .read_with(cx, |pane, _| pane.index_for_item(item))
2040            .ok()
2041            .flatten()
2042        else {
2043            return Ok(true);
2044        };
2045
2046        let (
2047            mut has_conflict,
2048            mut is_dirty,
2049            mut can_save,
2050            can_save_as,
2051            is_singleton,
2052            has_deleted_file,
2053        ) = cx.update(|_window, cx| {
2054            (
2055                item.has_conflict(cx),
2056                item.is_dirty(cx),
2057                item.can_save(cx),
2058                item.can_save_as(cx),
2059                item.buffer_kind(cx) == ItemBufferKind::Singleton,
2060                item.has_deleted_file(cx),
2061            )
2062        })?;
2063
2064        // when saving a single buffer, we ignore whether or not it's dirty.
2065        if save_intent == SaveIntent::Save || save_intent == SaveIntent::SaveWithoutFormat {
2066            is_dirty = true;
2067        }
2068
2069        if save_intent == SaveIntent::SaveAs {
2070            is_dirty = true;
2071            has_conflict = false;
2072            can_save = false;
2073        }
2074
2075        if save_intent == SaveIntent::Overwrite {
2076            has_conflict = false;
2077        }
2078
2079        let should_format = save_intent != SaveIntent::SaveWithoutFormat;
2080
2081        if has_conflict && can_save {
2082            if has_deleted_file && is_singleton {
2083                let answer = pane.update_in(cx, |pane, window, cx| {
2084                    pane.activate_item(item_ix, true, true, window, cx);
2085                    window.prompt(
2086                        PromptLevel::Warning,
2087                        DELETED_MESSAGE,
2088                        None,
2089                        &["Save", "Close", "Cancel"],
2090                        cx,
2091                    )
2092                })?;
2093                match answer.await {
2094                    Ok(0) => {
2095                        pane.update_in(cx, |_, window, cx| {
2096                            item.save(
2097                                SaveOptions {
2098                                    format: should_format,
2099                                    autosave: false,
2100                                },
2101                                project,
2102                                window,
2103                                cx,
2104                            )
2105                        })?
2106                        .await?
2107                    }
2108                    Ok(1) => {
2109                        pane.update_in(cx, |pane, window, cx| {
2110                            pane.remove_item(item.item_id(), false, true, window, cx)
2111                        })?;
2112                    }
2113                    _ => return Ok(false),
2114                }
2115                return Ok(true);
2116            } else {
2117                let answer = pane.update_in(cx, |pane, window, cx| {
2118                    pane.activate_item(item_ix, true, true, window, cx);
2119                    window.prompt(
2120                        PromptLevel::Warning,
2121                        CONFLICT_MESSAGE,
2122                        None,
2123                        &["Overwrite", "Discard", "Cancel"],
2124                        cx,
2125                    )
2126                })?;
2127                match answer.await {
2128                    Ok(0) => {
2129                        pane.update_in(cx, |_, window, cx| {
2130                            item.save(
2131                                SaveOptions {
2132                                    format: should_format,
2133                                    autosave: false,
2134                                },
2135                                project,
2136                                window,
2137                                cx,
2138                            )
2139                        })?
2140                        .await?
2141                    }
2142                    Ok(1) => {
2143                        pane.update_in(cx, |_, window, cx| item.reload(project, window, cx))?
2144                            .await?
2145                    }
2146                    _ => return Ok(false),
2147                }
2148            }
2149        } else if is_dirty && (can_save || can_save_as) {
2150            if save_intent == SaveIntent::Close {
2151                let will_autosave = cx.update(|_window, cx| {
2152                    item.can_autosave(cx)
2153                        && item.workspace_settings(cx).autosave.should_save_on_close()
2154                })?;
2155                if !will_autosave {
2156                    let item_id = item.item_id();
2157                    let answer_task = pane.update_in(cx, |pane, window, cx| {
2158                        if pane.save_modals_spawned.insert(item_id) {
2159                            pane.activate_item(item_ix, true, true, window, cx);
2160                            let prompt = dirty_message_for(item.project_path(cx), path_style);
2161                            Some(window.prompt(
2162                                PromptLevel::Warning,
2163                                &prompt,
2164                                None,
2165                                &["Save", "Don't Save", "Cancel"],
2166                                cx,
2167                            ))
2168                        } else {
2169                            None
2170                        }
2171                    })?;
2172                    if let Some(answer_task) = answer_task {
2173                        let answer = answer_task.await;
2174                        pane.update(cx, |pane, _| {
2175                            if !pane.save_modals_spawned.remove(&item_id) {
2176                                debug_panic!(
2177                                    "save modal was not present in spawned modals after awaiting for its answer"
2178                                )
2179                            }
2180                        })?;
2181                        match answer {
2182                            Ok(0) => {}
2183                            Ok(1) => {
2184                                // Don't save this file
2185                                pane.update_in(cx, |pane, _, cx| {
2186                                    if pane.is_tab_pinned(item_ix) && !item.can_save(cx) {
2187                                        pane.pinned_tab_count -= 1;
2188                                    }
2189                                })
2190                                .log_err();
2191                                return Ok(true);
2192                            }
2193                            _ => return Ok(false), // Cancel
2194                        }
2195                    } else {
2196                        return Ok(false);
2197                    }
2198                }
2199            }
2200
2201            if can_save {
2202                pane.update_in(cx, |pane, window, cx| {
2203                    if pane.is_active_preview_item(item.item_id()) {
2204                        pane.set_preview_item_id(None, cx);
2205                    }
2206                    item.save(
2207                        SaveOptions {
2208                            format: should_format,
2209                            autosave: false,
2210                        },
2211                        project,
2212                        window,
2213                        cx,
2214                    )
2215                })?
2216                .await?;
2217            } else if can_save_as && is_singleton {
2218                let suggested_name =
2219                    cx.update(|_window, cx| item.suggested_filename(cx).to_string())?;
2220                let new_path = pane.update_in(cx, |pane, window, cx| {
2221                    pane.activate_item(item_ix, true, true, window, cx);
2222                    pane.workspace.update(cx, |workspace, cx| {
2223                        let lister = if workspace.project().read(cx).is_local() {
2224                            DirectoryLister::Local(
2225                                workspace.project().clone(),
2226                                workspace.app_state().fs.clone(),
2227                            )
2228                        } else {
2229                            DirectoryLister::Project(workspace.project().clone())
2230                        };
2231                        workspace.prompt_for_new_path(lister, Some(suggested_name), window, cx)
2232                    })
2233                })??;
2234                let Some(new_path) = new_path.await.ok().flatten().into_iter().flatten().next()
2235                else {
2236                    return Ok(false);
2237                };
2238
2239                let project_path = pane
2240                    .update(cx, |pane, cx| {
2241                        pane.project
2242                            .update(cx, |project, cx| {
2243                                project.find_or_create_worktree(new_path, true, cx)
2244                            })
2245                            .ok()
2246                    })
2247                    .ok()
2248                    .flatten();
2249                let save_task = if let Some(project_path) = project_path {
2250                    let (worktree, path) = project_path.await?;
2251                    let worktree_id = worktree.read_with(cx, |worktree, _| worktree.id())?;
2252                    let new_path = ProjectPath {
2253                        worktree_id,
2254                        path: path,
2255                    };
2256
2257                    pane.update_in(cx, |pane, window, cx| {
2258                        if let Some(item) = pane.item_for_path(new_path.clone(), cx) {
2259                            pane.remove_item(item.item_id(), false, false, window, cx);
2260                        }
2261
2262                        item.save_as(project, new_path, window, cx)
2263                    })?
2264                } else {
2265                    return Ok(false);
2266                };
2267
2268                save_task.await?;
2269                return Ok(true);
2270            }
2271        }
2272
2273        pane.update(cx, |_, cx| {
2274            cx.emit(Event::UserSavedItem {
2275                item: item.downgrade_item(),
2276                save_intent,
2277            });
2278            true
2279        })
2280    }
2281
2282    pub fn autosave_item(
2283        item: &dyn ItemHandle,
2284        project: Entity<Project>,
2285        window: &mut Window,
2286        cx: &mut App,
2287    ) -> Task<Result<()>> {
2288        let format = !matches!(
2289            item.workspace_settings(cx).autosave,
2290            AutosaveSetting::AfterDelay { .. }
2291        );
2292        if item.can_autosave(cx) {
2293            item.save(
2294                SaveOptions {
2295                    format,
2296                    autosave: true,
2297                },
2298                project,
2299                window,
2300                cx,
2301            )
2302        } else {
2303            Task::ready(Ok(()))
2304        }
2305    }
2306
2307    pub fn focus_active_item(&mut self, window: &mut Window, cx: &mut Context<Self>) {
2308        if let Some(active_item) = self.active_item() {
2309            let focus_handle = active_item.item_focus_handle(cx);
2310            window.focus(&focus_handle);
2311        }
2312    }
2313
2314    pub fn split(&mut self, direction: SplitDirection, cx: &mut Context<Self>) {
2315        cx.emit(Event::Split {
2316            direction,
2317            clone_active_item: true,
2318        });
2319    }
2320
2321    pub fn split_and_move(&mut self, direction: SplitDirection, cx: &mut Context<Self>) {
2322        if self.items.len() > 1 {
2323            cx.emit(Event::Split {
2324                direction,
2325                clone_active_item: false,
2326            });
2327        }
2328    }
2329
2330    pub fn toolbar(&self) -> &Entity<Toolbar> {
2331        &self.toolbar
2332    }
2333
2334    pub fn handle_deleted_project_item(
2335        &mut self,
2336        entry_id: ProjectEntryId,
2337        window: &mut Window,
2338        cx: &mut Context<Pane>,
2339    ) -> Option<()> {
2340        let item_id = self.items().find_map(|item| {
2341            if item.buffer_kind(cx) == ItemBufferKind::Singleton
2342                && item.project_entry_ids(cx).as_slice() == [entry_id]
2343            {
2344                Some(item.item_id())
2345            } else {
2346                None
2347            }
2348        })?;
2349
2350        self.remove_item(item_id, false, true, window, cx);
2351        self.nav_history.remove_item(item_id);
2352
2353        Some(())
2354    }
2355
2356    fn update_toolbar(&mut self, window: &mut Window, cx: &mut Context<Self>) {
2357        let active_item = self
2358            .items
2359            .get(self.active_item_index)
2360            .map(|item| item.as_ref());
2361        self.toolbar.update(cx, |toolbar, cx| {
2362            toolbar.set_active_item(active_item, window, cx);
2363        });
2364    }
2365
2366    fn update_status_bar(&mut self, window: &mut Window, cx: &mut Context<Self>) {
2367        let workspace = self.workspace.clone();
2368        let pane = cx.entity();
2369
2370        window.defer(cx, move |window, cx| {
2371            let Ok(status_bar) =
2372                workspace.read_with(cx, |workspace, _| workspace.status_bar.clone())
2373            else {
2374                return;
2375            };
2376
2377            status_bar.update(cx, move |status_bar, cx| {
2378                status_bar.set_active_pane(&pane, window, cx);
2379            });
2380        });
2381    }
2382
2383    fn entry_abs_path(&self, entry: ProjectEntryId, cx: &App) -> Option<PathBuf> {
2384        let worktree = self
2385            .workspace
2386            .upgrade()?
2387            .read(cx)
2388            .project()
2389            .read(cx)
2390            .worktree_for_entry(entry, cx)?
2391            .read(cx);
2392        let entry = worktree.entry_for_id(entry)?;
2393        Some(match &entry.canonical_path {
2394            Some(canonical_path) => canonical_path.to_path_buf(),
2395            None => worktree.absolutize(&entry.path),
2396        })
2397    }
2398
2399    pub fn icon_color(selected: bool) -> Color {
2400        if selected {
2401            Color::Default
2402        } else {
2403            Color::Muted
2404        }
2405    }
2406
2407    fn toggle_pin_tab(&mut self, _: &TogglePinTab, window: &mut Window, cx: &mut Context<Self>) {
2408        if self.items.is_empty() {
2409            return;
2410        }
2411        let active_tab_ix = self.active_item_index();
2412        if self.is_tab_pinned(active_tab_ix) {
2413            self.unpin_tab_at(active_tab_ix, window, cx);
2414        } else {
2415            self.pin_tab_at(active_tab_ix, window, cx);
2416        }
2417    }
2418
2419    fn unpin_all_tabs(&mut self, _: &UnpinAllTabs, window: &mut Window, cx: &mut Context<Self>) {
2420        if self.items.is_empty() {
2421            return;
2422        }
2423
2424        let pinned_item_ids = self.pinned_item_ids().into_iter().rev();
2425
2426        for pinned_item_id in pinned_item_ids {
2427            if let Some(ix) = self.index_for_item_id(pinned_item_id) {
2428                self.unpin_tab_at(ix, window, cx);
2429            }
2430        }
2431    }
2432
2433    fn pin_tab_at(&mut self, ix: usize, window: &mut Window, cx: &mut Context<Self>) {
2434        self.change_tab_pin_state(ix, PinOperation::Pin, window, cx);
2435    }
2436
2437    fn unpin_tab_at(&mut self, ix: usize, window: &mut Window, cx: &mut Context<Self>) {
2438        self.change_tab_pin_state(ix, PinOperation::Unpin, window, cx);
2439    }
2440
2441    fn change_tab_pin_state(
2442        &mut self,
2443        ix: usize,
2444        operation: PinOperation,
2445        window: &mut Window,
2446        cx: &mut Context<Self>,
2447    ) {
2448        maybe!({
2449            let pane = cx.entity();
2450
2451            let destination_index = match operation {
2452                PinOperation::Pin => self.pinned_tab_count.min(ix),
2453                PinOperation::Unpin => self.pinned_tab_count.checked_sub(1)?,
2454            };
2455
2456            let id = self.item_for_index(ix)?.item_id();
2457            let should_activate = ix == self.active_item_index;
2458
2459            if matches!(operation, PinOperation::Pin) && self.is_active_preview_item(id) {
2460                self.set_preview_item_id(None, cx);
2461            }
2462
2463            match operation {
2464                PinOperation::Pin => self.pinned_tab_count += 1,
2465                PinOperation::Unpin => self.pinned_tab_count -= 1,
2466            }
2467
2468            if ix == destination_index {
2469                cx.notify();
2470            } else {
2471                self.workspace
2472                    .update(cx, |_, cx| {
2473                        cx.defer_in(window, move |_, window, cx| {
2474                            move_item(
2475                                &pane,
2476                                &pane,
2477                                id,
2478                                destination_index,
2479                                should_activate,
2480                                window,
2481                                cx,
2482                            );
2483                        });
2484                    })
2485                    .ok()?;
2486            }
2487
2488            let event = match operation {
2489                PinOperation::Pin => Event::ItemPinned,
2490                PinOperation::Unpin => Event::ItemUnpinned,
2491            };
2492
2493            cx.emit(event);
2494
2495            Some(())
2496        });
2497    }
2498
2499    fn is_tab_pinned(&self, ix: usize) -> bool {
2500        self.pinned_tab_count > ix
2501    }
2502
2503    fn has_unpinned_tabs(&self) -> bool {
2504        self.pinned_tab_count < self.items.len()
2505    }
2506
2507    fn activate_unpinned_tab(&mut self, window: &mut Window, cx: &mut Context<Self>) {
2508        if self.items.is_empty() {
2509            return;
2510        }
2511        let Some(index) = self
2512            .items()
2513            .enumerate()
2514            .find_map(|(index, _item)| (!self.is_tab_pinned(index)).then_some(index))
2515        else {
2516            return;
2517        };
2518        self.activate_item(index, true, true, window, cx);
2519    }
2520
2521    fn render_tab(
2522        &self,
2523        ix: usize,
2524        item: &dyn ItemHandle,
2525        detail: usize,
2526        focus_handle: &FocusHandle,
2527        window: &mut Window,
2528        cx: &mut Context<Pane>,
2529    ) -> impl IntoElement + use<> {
2530        let is_active = ix == self.active_item_index;
2531        let is_preview = self
2532            .preview_item_id
2533            .map(|id| id == item.item_id())
2534            .unwrap_or(false);
2535
2536        let label = item.tab_content(
2537            TabContentParams {
2538                detail: Some(detail),
2539                selected: is_active,
2540                preview: is_preview,
2541                deemphasized: !self.has_focus(window, cx),
2542            },
2543            window,
2544            cx,
2545        );
2546
2547        let item_diagnostic = item
2548            .project_path(cx)
2549            .map_or(None, |project_path| self.diagnostics.get(&project_path));
2550
2551        let decorated_icon = item_diagnostic.map_or(None, |diagnostic| {
2552            let icon = match item.tab_icon(window, cx) {
2553                Some(icon) => icon,
2554                None => return None,
2555            };
2556
2557            let knockout_item_color = if is_active {
2558                cx.theme().colors().tab_active_background
2559            } else {
2560                cx.theme().colors().tab_bar_background
2561            };
2562
2563            let (icon_decoration, icon_color) = if matches!(diagnostic, &DiagnosticSeverity::ERROR)
2564            {
2565                (IconDecorationKind::X, Color::Error)
2566            } else {
2567                (IconDecorationKind::Triangle, Color::Warning)
2568            };
2569
2570            Some(DecoratedIcon::new(
2571                icon.size(IconSize::Small).color(Color::Muted),
2572                Some(
2573                    IconDecoration::new(icon_decoration, knockout_item_color, cx)
2574                        .color(icon_color.color(cx))
2575                        .position(Point {
2576                            x: px(-2.),
2577                            y: px(-2.),
2578                        }),
2579                ),
2580            ))
2581        });
2582
2583        let icon = if decorated_icon.is_none() {
2584            match item_diagnostic {
2585                Some(&DiagnosticSeverity::ERROR) => None,
2586                Some(&DiagnosticSeverity::WARNING) => None,
2587                _ => item
2588                    .tab_icon(window, cx)
2589                    .map(|icon| icon.color(Color::Muted)),
2590            }
2591            .map(|icon| icon.size(IconSize::Small))
2592        } else {
2593            None
2594        };
2595
2596        let settings = ItemSettings::get_global(cx);
2597        let close_side = &settings.close_position;
2598        let show_close_button = &settings.show_close_button;
2599        let indicator = render_item_indicator(item.boxed_clone(), cx);
2600        let item_id = item.item_id();
2601        let is_first_item = ix == 0;
2602        let is_last_item = ix == self.items.len() - 1;
2603        let is_pinned = self.is_tab_pinned(ix);
2604        let position_relative_to_active_item = ix.cmp(&self.active_item_index);
2605
2606        let tab = Tab::new(ix)
2607            .position(if is_first_item {
2608                TabPosition::First
2609            } else if is_last_item {
2610                TabPosition::Last
2611            } else {
2612                TabPosition::Middle(position_relative_to_active_item)
2613            })
2614            .close_side(match close_side {
2615                ClosePosition::Left => ui::TabCloseSide::Start,
2616                ClosePosition::Right => ui::TabCloseSide::End,
2617            })
2618            .toggle_state(is_active)
2619            .on_click(cx.listener(move |pane: &mut Self, _, window, cx| {
2620                pane.activate_item(ix, true, true, window, cx)
2621            }))
2622            // TODO: This should be a click listener with the middle mouse button instead of a mouse down listener.
2623            .on_mouse_down(
2624                MouseButton::Middle,
2625                cx.listener(move |pane, _event, window, cx| {
2626                    pane.close_item_by_id(item_id, SaveIntent::Close, window, cx)
2627                        .detach_and_log_err(cx);
2628                }),
2629            )
2630            .on_mouse_down(
2631                MouseButton::Left,
2632                cx.listener(move |pane, event: &MouseDownEvent, _, cx| {
2633                    if let Some(id) = pane.preview_item_id
2634                        && id == item_id
2635                        && event.click_count > 1
2636                    {
2637                        pane.set_preview_item_id(None, cx);
2638                    }
2639                }),
2640            )
2641            .on_drag(
2642                DraggedTab {
2643                    item: item.boxed_clone(),
2644                    pane: cx.entity(),
2645                    detail,
2646                    is_active,
2647                    ix,
2648                },
2649                |tab, _, _, cx| cx.new(|_| tab.clone()),
2650            )
2651            .drag_over::<DraggedTab>(move |tab, dragged_tab: &DraggedTab, _, cx| {
2652                let mut styled_tab = tab
2653                    .bg(cx.theme().colors().drop_target_background)
2654                    .border_color(cx.theme().colors().drop_target_border)
2655                    .border_0();
2656
2657                if ix < dragged_tab.ix {
2658                    styled_tab = styled_tab.border_l_2();
2659                } else if ix > dragged_tab.ix {
2660                    styled_tab = styled_tab.border_r_2();
2661                }
2662
2663                styled_tab
2664            })
2665            .drag_over::<DraggedSelection>(|tab, _, _, cx| {
2666                tab.bg(cx.theme().colors().drop_target_background)
2667            })
2668            .when_some(self.can_drop_predicate.clone(), |this, p| {
2669                this.can_drop(move |a, window, cx| p(a, window, cx))
2670            })
2671            .on_drop(
2672                cx.listener(move |this, dragged_tab: &DraggedTab, window, cx| {
2673                    this.drag_split_direction = None;
2674                    this.handle_tab_drop(dragged_tab, ix, window, cx)
2675                }),
2676            )
2677            .on_drop(
2678                cx.listener(move |this, selection: &DraggedSelection, window, cx| {
2679                    this.drag_split_direction = None;
2680                    this.handle_dragged_selection_drop(selection, Some(ix), window, cx)
2681                }),
2682            )
2683            .on_drop(cx.listener(move |this, paths, window, cx| {
2684                this.drag_split_direction = None;
2685                this.handle_external_paths_drop(paths, window, cx)
2686            }))
2687            .when_some(item.tab_tooltip_content(cx), |tab, content| match content {
2688                TabTooltipContent::Text(text) => tab.tooltip(Tooltip::text(text)),
2689                TabTooltipContent::Custom(element_fn) => {
2690                    tab.tooltip(move |window, cx| element_fn(window, cx))
2691                }
2692            })
2693            .start_slot::<Indicator>(indicator)
2694            .map(|this| {
2695                let end_slot_action: &'static dyn Action;
2696                let end_slot_tooltip_text: &'static str;
2697                let end_slot = if is_pinned {
2698                    end_slot_action = &TogglePinTab;
2699                    end_slot_tooltip_text = "Unpin Tab";
2700                    IconButton::new("unpin tab", IconName::Pin)
2701                        .shape(IconButtonShape::Square)
2702                        .icon_color(Color::Muted)
2703                        .size(ButtonSize::None)
2704                        .icon_size(IconSize::Small)
2705                        .on_click(cx.listener(move |pane, _, window, cx| {
2706                            pane.unpin_tab_at(ix, window, cx);
2707                        }))
2708                } else {
2709                    end_slot_action = &CloseActiveItem {
2710                        save_intent: None,
2711                        close_pinned: false,
2712                    };
2713                    end_slot_tooltip_text = "Close Tab";
2714                    match show_close_button {
2715                        ShowCloseButton::Always => IconButton::new("close tab", IconName::Close),
2716                        ShowCloseButton::Hover => {
2717                            IconButton::new("close tab", IconName::Close).visible_on_hover("")
2718                        }
2719                        ShowCloseButton::Hidden => return this,
2720                    }
2721                    .shape(IconButtonShape::Square)
2722                    .icon_color(Color::Muted)
2723                    .size(ButtonSize::None)
2724                    .icon_size(IconSize::Small)
2725                    .on_click(cx.listener(move |pane, _, window, cx| {
2726                        pane.close_item_by_id(item_id, SaveIntent::Close, window, cx)
2727                            .detach_and_log_err(cx);
2728                    }))
2729                }
2730                .map(|this| {
2731                    if is_active {
2732                        let focus_handle = focus_handle.clone();
2733                        this.tooltip(move |_window, cx| {
2734                            Tooltip::for_action_in(
2735                                end_slot_tooltip_text,
2736                                end_slot_action,
2737                                &focus_handle,
2738                                cx,
2739                            )
2740                        })
2741                    } else {
2742                        this.tooltip(Tooltip::text(end_slot_tooltip_text))
2743                    }
2744                });
2745                this.end_slot(end_slot)
2746            })
2747            .child(
2748                h_flex()
2749                    .gap_1()
2750                    .items_center()
2751                    .children(
2752                        std::iter::once(if let Some(decorated_icon) = decorated_icon {
2753                            Some(div().child(decorated_icon.into_any_element()))
2754                        } else {
2755                            icon.map(|icon| div().child(icon.into_any_element()))
2756                        })
2757                        .flatten(),
2758                    )
2759                    .child(label),
2760            );
2761
2762        let single_entry_to_resolve = (self.items[ix].buffer_kind(cx) == ItemBufferKind::Singleton)
2763            .then(|| self.items[ix].project_entry_ids(cx).get(0).copied())
2764            .flatten();
2765
2766        let total_items = self.items.len();
2767        let has_multibuffer_items = self
2768            .items
2769            .iter()
2770            .any(|item| item.buffer_kind(cx) == ItemBufferKind::Multibuffer);
2771        let has_items_to_left = ix > 0;
2772        let has_items_to_right = ix < total_items - 1;
2773        let has_clean_items = self.items.iter().any(|item| !item.is_dirty(cx));
2774        let is_pinned = self.is_tab_pinned(ix);
2775        let pane = cx.entity().downgrade();
2776        let menu_context = item.item_focus_handle(cx);
2777        right_click_menu(ix)
2778            .trigger(|_, _, _| tab)
2779            .menu(move |window, cx| {
2780                let pane = pane.clone();
2781                let menu_context = menu_context.clone();
2782                ContextMenu::build(window, cx, move |mut menu, window, cx| {
2783                    let close_active_item_action = CloseActiveItem {
2784                        save_intent: None,
2785                        close_pinned: true,
2786                    };
2787                    let close_inactive_items_action = CloseOtherItems {
2788                        save_intent: None,
2789                        close_pinned: false,
2790                    };
2791                    let close_multibuffers_action = CloseMultibufferItems {
2792                        save_intent: None,
2793                        close_pinned: false,
2794                    };
2795                    let close_items_to_the_left_action = CloseItemsToTheLeft {
2796                        close_pinned: false,
2797                    };
2798                    let close_items_to_the_right_action = CloseItemsToTheRight {
2799                        close_pinned: false,
2800                    };
2801                    let close_clean_items_action = CloseCleanItems {
2802                        close_pinned: false,
2803                    };
2804                    let close_all_items_action = CloseAllItems {
2805                        save_intent: None,
2806                        close_pinned: false,
2807                    };
2808                    if let Some(pane) = pane.upgrade() {
2809                        menu = menu
2810                            .entry(
2811                                "Close",
2812                                Some(Box::new(close_active_item_action)),
2813                                window.handler_for(&pane, move |pane, window, cx| {
2814                                    pane.close_item_by_id(item_id, SaveIntent::Close, window, cx)
2815                                        .detach_and_log_err(cx);
2816                                }),
2817                            )
2818                            .item(ContextMenuItem::Entry(
2819                                ContextMenuEntry::new("Close Others")
2820                                    .action(Box::new(close_inactive_items_action.clone()))
2821                                    .disabled(total_items == 1)
2822                                    .handler(window.handler_for(&pane, move |pane, window, cx| {
2823                                        pane.close_other_items(
2824                                            &close_inactive_items_action,
2825                                            Some(item_id),
2826                                            window,
2827                                            cx,
2828                                        )
2829                                        .detach_and_log_err(cx);
2830                                    })),
2831                            ))
2832                            // We make this optional, instead of using disabled as to not overwhelm the context menu unnecessarily
2833                            .extend(has_multibuffer_items.then(|| {
2834                                ContextMenuItem::Entry(
2835                                    ContextMenuEntry::new("Close Multibuffers")
2836                                        .action(Box::new(close_multibuffers_action.clone()))
2837                                        .handler(window.handler_for(
2838                                            &pane,
2839                                            move |pane, window, cx| {
2840                                                pane.close_multibuffer_items(
2841                                                    &close_multibuffers_action,
2842                                                    window,
2843                                                    cx,
2844                                                )
2845                                                .detach_and_log_err(cx);
2846                                            },
2847                                        )),
2848                                )
2849                            }))
2850                            .separator()
2851                            .item(ContextMenuItem::Entry(
2852                                ContextMenuEntry::new("Close Left")
2853                                    .action(Box::new(close_items_to_the_left_action.clone()))
2854                                    .disabled(!has_items_to_left)
2855                                    .handler(window.handler_for(&pane, move |pane, window, cx| {
2856                                        pane.close_items_to_the_left_by_id(
2857                                            Some(item_id),
2858                                            &close_items_to_the_left_action,
2859                                            window,
2860                                            cx,
2861                                        )
2862                                        .detach_and_log_err(cx);
2863                                    })),
2864                            ))
2865                            .item(ContextMenuItem::Entry(
2866                                ContextMenuEntry::new("Close Right")
2867                                    .action(Box::new(close_items_to_the_right_action.clone()))
2868                                    .disabled(!has_items_to_right)
2869                                    .handler(window.handler_for(&pane, move |pane, window, cx| {
2870                                        pane.close_items_to_the_right_by_id(
2871                                            Some(item_id),
2872                                            &close_items_to_the_right_action,
2873                                            window,
2874                                            cx,
2875                                        )
2876                                        .detach_and_log_err(cx);
2877                                    })),
2878                            ))
2879                            .separator()
2880                            .item(ContextMenuItem::Entry(
2881                                ContextMenuEntry::new("Close Clean")
2882                                    .action(Box::new(close_clean_items_action.clone()))
2883                                    .disabled(!has_clean_items)
2884                                    .handler(window.handler_for(&pane, move |pane, window, cx| {
2885                                        pane.close_clean_items(
2886                                            &close_clean_items_action,
2887                                            window,
2888                                            cx,
2889                                        )
2890                                        .detach_and_log_err(cx)
2891                                    })),
2892                            ))
2893                            .entry(
2894                                "Close All",
2895                                Some(Box::new(close_all_items_action.clone())),
2896                                window.handler_for(&pane, move |pane, window, cx| {
2897                                    pane.close_all_items(&close_all_items_action, window, cx)
2898                                        .detach_and_log_err(cx)
2899                                }),
2900                            );
2901
2902                        let pin_tab_entries = |menu: ContextMenu| {
2903                            menu.separator().map(|this| {
2904                                if is_pinned {
2905                                    this.entry(
2906                                        "Unpin Tab",
2907                                        Some(TogglePinTab.boxed_clone()),
2908                                        window.handler_for(&pane, move |pane, window, cx| {
2909                                            pane.unpin_tab_at(ix, window, cx);
2910                                        }),
2911                                    )
2912                                } else {
2913                                    this.entry(
2914                                        "Pin Tab",
2915                                        Some(TogglePinTab.boxed_clone()),
2916                                        window.handler_for(&pane, move |pane, window, cx| {
2917                                            pane.pin_tab_at(ix, window, cx);
2918                                        }),
2919                                    )
2920                                }
2921                            })
2922                        };
2923                        if let Some(entry) = single_entry_to_resolve {
2924                            let project_path = pane
2925                                .read(cx)
2926                                .item_for_entry(entry, cx)
2927                                .and_then(|item| item.project_path(cx));
2928                            let worktree = project_path.as_ref().and_then(|project_path| {
2929                                pane.read(cx)
2930                                    .project
2931                                    .upgrade()?
2932                                    .read(cx)
2933                                    .worktree_for_id(project_path.worktree_id, cx)
2934                            });
2935                            let has_relative_path = worktree.as_ref().is_some_and(|worktree| {
2936                                worktree
2937                                    .read(cx)
2938                                    .root_entry()
2939                                    .is_some_and(|entry| entry.is_dir())
2940                            });
2941
2942                            let entry_abs_path = pane.read(cx).entry_abs_path(entry, cx);
2943                            let parent_abs_path = entry_abs_path
2944                                .as_deref()
2945                                .and_then(|abs_path| Some(abs_path.parent()?.to_path_buf()));
2946                            let relative_path = project_path
2947                                .map(|project_path| project_path.path)
2948                                .filter(|_| has_relative_path);
2949
2950                            let visible_in_project_panel = relative_path.is_some()
2951                                && worktree.is_some_and(|worktree| worktree.read(cx).is_visible());
2952
2953                            let entry_id = entry.to_proto();
2954                            menu = menu
2955                                .separator()
2956                                .when_some(entry_abs_path, |menu, abs_path| {
2957                                    menu.entry(
2958                                        "Copy Path",
2959                                        Some(Box::new(zed_actions::workspace::CopyPath)),
2960                                        window.handler_for(&pane, move |_, _, cx| {
2961                                            cx.write_to_clipboard(ClipboardItem::new_string(
2962                                                abs_path.to_string_lossy().into_owned(),
2963                                            ));
2964                                        }),
2965                                    )
2966                                })
2967                                .when_some(relative_path, |menu, relative_path| {
2968                                    menu.entry(
2969                                        "Copy Relative Path",
2970                                        Some(Box::new(zed_actions::workspace::CopyRelativePath)),
2971                                        window.handler_for(&pane, move |this, _, cx| {
2972                                            let Some(project) = this.project.upgrade() else {
2973                                                return;
2974                                            };
2975                                            let path_style = project
2976                                                .update(cx, |project, cx| project.path_style(cx));
2977                                            cx.write_to_clipboard(ClipboardItem::new_string(
2978                                                relative_path.display(path_style).to_string(),
2979                                            ));
2980                                        }),
2981                                    )
2982                                })
2983                                .map(pin_tab_entries)
2984                                .separator()
2985                                .when(visible_in_project_panel, |menu| {
2986                                    menu.entry(
2987                                        "Reveal In Project Panel",
2988                                        Some(Box::new(RevealInProjectPanel::default())),
2989                                        window.handler_for(&pane, move |pane, _, cx| {
2990                                            pane.project
2991                                                .update(cx, |_, cx| {
2992                                                    cx.emit(project::Event::RevealInProjectPanel(
2993                                                        ProjectEntryId::from_proto(entry_id),
2994                                                    ))
2995                                                })
2996                                                .ok();
2997                                        }),
2998                                    )
2999                                })
3000                                .when_some(parent_abs_path, |menu, parent_abs_path| {
3001                                    menu.entry(
3002                                        "Open in Terminal",
3003                                        Some(Box::new(OpenInTerminal)),
3004                                        window.handler_for(&pane, move |_, window, cx| {
3005                                            window.dispatch_action(
3006                                                OpenTerminal {
3007                                                    working_directory: parent_abs_path.clone(),
3008                                                }
3009                                                .boxed_clone(),
3010                                                cx,
3011                                            );
3012                                        }),
3013                                    )
3014                                });
3015                        } else {
3016                            menu = menu.map(pin_tab_entries);
3017                        }
3018                    }
3019
3020                    menu.context(menu_context)
3021                })
3022            })
3023    }
3024
3025    fn render_tab_bar(&mut self, window: &mut Window, cx: &mut Context<Pane>) -> AnyElement {
3026        let focus_handle = self.focus_handle.clone();
3027        let navigate_backward = IconButton::new("navigate_backward", IconName::ArrowLeft)
3028            .icon_size(IconSize::Small)
3029            .on_click({
3030                let entity = cx.entity();
3031                move |_, window, cx| {
3032                    entity.update(cx, |pane, cx| {
3033                        pane.navigate_backward(&Default::default(), window, cx)
3034                    })
3035                }
3036            })
3037            .disabled(!self.can_navigate_backward())
3038            .tooltip({
3039                let focus_handle = focus_handle.clone();
3040                move |_window, cx| Tooltip::for_action_in("Go Back", &GoBack, &focus_handle, cx)
3041            });
3042
3043        let navigate_forward = IconButton::new("navigate_forward", IconName::ArrowRight)
3044            .icon_size(IconSize::Small)
3045            .on_click({
3046                let entity = cx.entity();
3047                move |_, window, cx| {
3048                    entity.update(cx, |pane, cx| {
3049                        pane.navigate_forward(&Default::default(), window, cx)
3050                    })
3051                }
3052            })
3053            .disabled(!self.can_navigate_forward())
3054            .tooltip({
3055                let focus_handle = focus_handle.clone();
3056                move |_window, cx| {
3057                    Tooltip::for_action_in("Go Forward", &GoForward, &focus_handle, cx)
3058                }
3059            });
3060
3061        let mut tab_items = self
3062            .items
3063            .iter()
3064            .enumerate()
3065            .zip(tab_details(&self.items, window, cx))
3066            .map(|((ix, item), detail)| {
3067                self.render_tab(ix, &**item, detail, &focus_handle, window, cx)
3068            })
3069            .collect::<Vec<_>>();
3070        let tab_count = tab_items.len();
3071        if self.is_tab_pinned(tab_count) {
3072            log::warn!(
3073                "Pinned tab count ({}) exceeds actual tab count ({}). \
3074                This should not happen. If possible, add reproduction steps, \
3075                in a comment, to https://github.com/zed-industries/zed/issues/33342",
3076                self.pinned_tab_count,
3077                tab_count
3078            );
3079            self.pinned_tab_count = tab_count;
3080        }
3081        let unpinned_tabs = tab_items.split_off(self.pinned_tab_count);
3082        let pinned_tabs = tab_items;
3083        TabBar::new("tab_bar")
3084            .when(
3085                self.display_nav_history_buttons.unwrap_or_default(),
3086                |tab_bar| {
3087                    tab_bar
3088                        .start_child(navigate_backward)
3089                        .start_child(navigate_forward)
3090                },
3091            )
3092            .map(|tab_bar| {
3093                if self.show_tab_bar_buttons {
3094                    let render_tab_buttons = self.render_tab_bar_buttons.clone();
3095                    let (left_children, right_children) = render_tab_buttons(self, window, cx);
3096                    tab_bar
3097                        .start_children(left_children)
3098                        .end_children(right_children)
3099                } else {
3100                    tab_bar
3101                }
3102            })
3103            .children(pinned_tabs.len().ne(&0).then(|| {
3104                let max_scroll = self.tab_bar_scroll_handle.max_offset().width;
3105                // We need to check both because offset returns delta values even when the scroll handle is not scrollable
3106                let is_scrollable = !max_scroll.is_zero();
3107                let is_scrolled = self.tab_bar_scroll_handle.offset().x < px(0.);
3108                let has_active_unpinned_tab = self.active_item_index >= self.pinned_tab_count;
3109                h_flex()
3110                    .children(pinned_tabs)
3111                    .when(is_scrollable && is_scrolled, |this| {
3112                        this.when(has_active_unpinned_tab, |this| this.border_r_2())
3113                            .when(!has_active_unpinned_tab, |this| this.border_r_1())
3114                            .border_color(cx.theme().colors().border)
3115                    })
3116            }))
3117            .child(
3118                h_flex()
3119                    .id("unpinned tabs")
3120                    .overflow_x_scroll()
3121                    .w_full()
3122                    .track_scroll(&self.tab_bar_scroll_handle)
3123                    .on_scroll_wheel(cx.listener(|this, _, _, _| {
3124                        this.suppress_scroll = true;
3125                    }))
3126                    .children(unpinned_tabs)
3127                    .child(
3128                        div()
3129                            .id("tab_bar_drop_target")
3130                            .min_w_6()
3131                            // HACK: This empty child is currently necessary to force the drop target to appear
3132                            // despite us setting a min width above.
3133                            .child("")
3134                            // HACK: h_full doesn't occupy the complete height, using fixed height instead
3135                            .h(Tab::container_height(cx))
3136                            .flex_grow()
3137                            .drag_over::<DraggedTab>(|bar, _, _, cx| {
3138                                bar.bg(cx.theme().colors().drop_target_background)
3139                            })
3140                            .drag_over::<DraggedSelection>(|bar, _, _, cx| {
3141                                bar.bg(cx.theme().colors().drop_target_background)
3142                            })
3143                            .on_drop(cx.listener(
3144                                move |this, dragged_tab: &DraggedTab, window, cx| {
3145                                    this.drag_split_direction = None;
3146                                    this.handle_tab_drop(dragged_tab, this.items.len(), window, cx)
3147                                },
3148                            ))
3149                            .on_drop(cx.listener(
3150                                move |this, selection: &DraggedSelection, window, cx| {
3151                                    this.drag_split_direction = None;
3152                                    this.handle_project_entry_drop(
3153                                        &selection.active_selection.entry_id,
3154                                        Some(tab_count),
3155                                        window,
3156                                        cx,
3157                                    )
3158                                },
3159                            ))
3160                            .on_drop(cx.listener(move |this, paths, window, cx| {
3161                                this.drag_split_direction = None;
3162                                this.handle_external_paths_drop(paths, window, cx)
3163                            }))
3164                            .on_click(cx.listener(move |this, event: &ClickEvent, window, cx| {
3165                                if event.click_count() == 2 {
3166                                    window.dispatch_action(
3167                                        this.double_click_dispatch_action.boxed_clone(),
3168                                        cx,
3169                                    );
3170                                }
3171                            })),
3172                    ),
3173            )
3174            .into_any_element()
3175    }
3176
3177    pub fn render_menu_overlay(menu: &Entity<ContextMenu>) -> Div {
3178        div().absolute().bottom_0().right_0().size_0().child(
3179            deferred(anchored().anchor(Corner::TopRight).child(menu.clone())).with_priority(1),
3180        )
3181    }
3182
3183    pub fn set_zoomed(&mut self, zoomed: bool, cx: &mut Context<Self>) {
3184        self.zoomed = zoomed;
3185        cx.notify();
3186    }
3187
3188    pub fn is_zoomed(&self) -> bool {
3189        self.zoomed
3190    }
3191
3192    fn handle_drag_move<T: 'static>(
3193        &mut self,
3194        event: &DragMoveEvent<T>,
3195        window: &mut Window,
3196        cx: &mut Context<Self>,
3197    ) {
3198        let can_split_predicate = self.can_split_predicate.take();
3199        let can_split = match &can_split_predicate {
3200            Some(can_split_predicate) => {
3201                can_split_predicate(self, event.dragged_item(), window, cx)
3202            }
3203            None => false,
3204        };
3205        self.can_split_predicate = can_split_predicate;
3206        if !can_split {
3207            return;
3208        }
3209
3210        let rect = event.bounds.size;
3211
3212        let size = event.bounds.size.width.min(event.bounds.size.height)
3213            * WorkspaceSettings::get_global(cx).drop_target_size;
3214
3215        let relative_cursor = Point::new(
3216            event.event.position.x - event.bounds.left(),
3217            event.event.position.y - event.bounds.top(),
3218        );
3219
3220        let direction = if relative_cursor.x < size
3221            || relative_cursor.x > rect.width - size
3222            || relative_cursor.y < size
3223            || relative_cursor.y > rect.height - size
3224        {
3225            [
3226                SplitDirection::Up,
3227                SplitDirection::Right,
3228                SplitDirection::Down,
3229                SplitDirection::Left,
3230            ]
3231            .iter()
3232            .min_by_key(|side| match side {
3233                SplitDirection::Up => relative_cursor.y,
3234                SplitDirection::Right => rect.width - relative_cursor.x,
3235                SplitDirection::Down => rect.height - relative_cursor.y,
3236                SplitDirection::Left => relative_cursor.x,
3237            })
3238            .cloned()
3239        } else {
3240            None
3241        };
3242
3243        if direction != self.drag_split_direction {
3244            self.drag_split_direction = direction;
3245        }
3246    }
3247
3248    pub fn handle_tab_drop(
3249        &mut self,
3250        dragged_tab: &DraggedTab,
3251        ix: usize,
3252        window: &mut Window,
3253        cx: &mut Context<Self>,
3254    ) {
3255        if let Some(custom_drop_handle) = self.custom_drop_handle.clone()
3256            && let ControlFlow::Break(()) = custom_drop_handle(self, dragged_tab, window, cx)
3257        {
3258            return;
3259        }
3260        let mut to_pane = cx.entity();
3261        let split_direction = self.drag_split_direction;
3262        let item_id = dragged_tab.item.item_id();
3263        if let Some(preview_item_id) = self.preview_item_id
3264            && item_id == preview_item_id
3265        {
3266            self.set_preview_item_id(None, cx);
3267        }
3268
3269        let is_clone = cfg!(target_os = "macos") && window.modifiers().alt
3270            || cfg!(not(target_os = "macos")) && window.modifiers().control;
3271
3272        let from_pane = dragged_tab.pane.clone();
3273
3274        self.workspace
3275            .update(cx, |_, cx| {
3276                cx.defer_in(window, move |workspace, window, cx| {
3277                    if let Some(split_direction) = split_direction {
3278                        to_pane = workspace.split_pane(to_pane, split_direction, window, cx);
3279                    }
3280                    let database_id = workspace.database_id();
3281                    let was_pinned_in_from_pane = from_pane.read_with(cx, |pane, _| {
3282                        pane.index_for_item_id(item_id)
3283                            .is_some_and(|ix| pane.is_tab_pinned(ix))
3284                    });
3285                    let to_pane_old_length = to_pane.read(cx).items.len();
3286                    if is_clone {
3287                        let Some(item) = from_pane
3288                            .read(cx)
3289                            .items()
3290                            .find(|item| item.item_id() == item_id)
3291                            .cloned()
3292                        else {
3293                            return;
3294                        };
3295                        if item.can_split(cx) {
3296                            let task = item.clone_on_split(database_id, window, cx);
3297                            let to_pane = to_pane.downgrade();
3298                            cx.spawn_in(window, async move |_, cx| {
3299                                if let Some(item) = task.await {
3300                                    to_pane
3301                                        .update_in(cx, |pane, window, cx| {
3302                                            pane.add_item(item, true, true, None, window, cx)
3303                                        })
3304                                        .ok();
3305                                }
3306                            })
3307                            .detach();
3308                        } else {
3309                            move_item(&from_pane, &to_pane, item_id, ix, true, window, cx);
3310                        }
3311                    } else {
3312                        move_item(&from_pane, &to_pane, item_id, ix, true, window, cx);
3313                    }
3314                    to_pane.update(cx, |this, _| {
3315                        if to_pane == from_pane {
3316                            let actual_ix = this
3317                                .items
3318                                .iter()
3319                                .position(|item| item.item_id() == item_id)
3320                                .unwrap_or(0);
3321
3322                            let is_pinned_in_to_pane = this.is_tab_pinned(actual_ix);
3323
3324                            if !was_pinned_in_from_pane && is_pinned_in_to_pane {
3325                                this.pinned_tab_count += 1;
3326                            } else if was_pinned_in_from_pane && !is_pinned_in_to_pane {
3327                                this.pinned_tab_count -= 1;
3328                            }
3329                        } else if this.items.len() >= to_pane_old_length {
3330                            let is_pinned_in_to_pane = this.is_tab_pinned(ix);
3331                            let item_created_pane = to_pane_old_length == 0;
3332                            let is_first_position = ix == 0;
3333                            let was_dropped_at_beginning = item_created_pane || is_first_position;
3334                            let should_remain_pinned = is_pinned_in_to_pane
3335                                || (was_pinned_in_from_pane && was_dropped_at_beginning);
3336
3337                            if should_remain_pinned {
3338                                this.pinned_tab_count += 1;
3339                            }
3340                        }
3341                    });
3342                });
3343            })
3344            .log_err();
3345    }
3346
3347    fn handle_dragged_selection_drop(
3348        &mut self,
3349        dragged_selection: &DraggedSelection,
3350        dragged_onto: Option<usize>,
3351        window: &mut Window,
3352        cx: &mut Context<Self>,
3353    ) {
3354        if let Some(custom_drop_handle) = self.custom_drop_handle.clone()
3355            && let ControlFlow::Break(()) = custom_drop_handle(self, dragged_selection, window, cx)
3356        {
3357            return;
3358        }
3359        self.handle_project_entry_drop(
3360            &dragged_selection.active_selection.entry_id,
3361            dragged_onto,
3362            window,
3363            cx,
3364        );
3365    }
3366
3367    fn handle_project_entry_drop(
3368        &mut self,
3369        project_entry_id: &ProjectEntryId,
3370        target: Option<usize>,
3371        window: &mut Window,
3372        cx: &mut Context<Self>,
3373    ) {
3374        if let Some(custom_drop_handle) = self.custom_drop_handle.clone()
3375            && let ControlFlow::Break(()) = custom_drop_handle(self, project_entry_id, window, cx)
3376        {
3377            return;
3378        }
3379        let mut to_pane = cx.entity();
3380        let split_direction = self.drag_split_direction;
3381        let project_entry_id = *project_entry_id;
3382        self.workspace
3383            .update(cx, |_, cx| {
3384                cx.defer_in(window, move |workspace, window, cx| {
3385                    if let Some(project_path) = workspace
3386                        .project()
3387                        .read(cx)
3388                        .path_for_entry(project_entry_id, cx)
3389                    {
3390                        let load_path_task = workspace.load_path(project_path.clone(), window, cx);
3391                        cx.spawn_in(window, async move |workspace, cx| {
3392                            if let Some((project_entry_id, build_item)) =
3393                                load_path_task.await.notify_async_err(cx)
3394                            {
3395                                let (to_pane, new_item_handle) = workspace
3396                                    .update_in(cx, |workspace, window, cx| {
3397                                        if let Some(split_direction) = split_direction {
3398                                            to_pane = workspace.split_pane(
3399                                                to_pane,
3400                                                split_direction,
3401                                                window,
3402                                                cx,
3403                                            );
3404                                        }
3405                                        let new_item_handle = to_pane.update(cx, |pane, cx| {
3406                                            pane.open_item(
3407                                                project_entry_id,
3408                                                project_path,
3409                                                true,
3410                                                false,
3411                                                true,
3412                                                target,
3413                                                window,
3414                                                cx,
3415                                                build_item,
3416                                            )
3417                                        });
3418                                        (to_pane, new_item_handle)
3419                                    })
3420                                    .log_err()?;
3421                                to_pane
3422                                    .update_in(cx, |this, window, cx| {
3423                                        let Some(index) = this.index_for_item(&*new_item_handle)
3424                                        else {
3425                                            return;
3426                                        };
3427
3428                                        if target.is_some_and(|target| this.is_tab_pinned(target)) {
3429                                            this.pin_tab_at(index, window, cx);
3430                                        }
3431                                    })
3432                                    .ok()?
3433                            }
3434                            Some(())
3435                        })
3436                        .detach();
3437                    };
3438                });
3439            })
3440            .log_err();
3441    }
3442
3443    fn handle_external_paths_drop(
3444        &mut self,
3445        paths: &ExternalPaths,
3446        window: &mut Window,
3447        cx: &mut Context<Self>,
3448    ) {
3449        if let Some(custom_drop_handle) = self.custom_drop_handle.clone()
3450            && let ControlFlow::Break(()) = custom_drop_handle(self, paths, window, cx)
3451        {
3452            return;
3453        }
3454        let mut to_pane = cx.entity();
3455        let mut split_direction = self.drag_split_direction;
3456        let paths = paths.paths().to_vec();
3457        let is_remote = self
3458            .workspace
3459            .update(cx, |workspace, cx| {
3460                if workspace.project().read(cx).is_via_collab() {
3461                    workspace.show_error(
3462                        &anyhow::anyhow!("Cannot drop files on a remote project"),
3463                        cx,
3464                    );
3465                    true
3466                } else {
3467                    false
3468                }
3469            })
3470            .unwrap_or(true);
3471        if is_remote {
3472            return;
3473        }
3474
3475        self.workspace
3476            .update(cx, |workspace, cx| {
3477                let fs = Arc::clone(workspace.project().read(cx).fs());
3478                cx.spawn_in(window, async move |workspace, cx| {
3479                    let mut is_file_checks = FuturesUnordered::new();
3480                    for path in &paths {
3481                        is_file_checks.push(fs.is_file(path))
3482                    }
3483                    let mut has_files_to_open = false;
3484                    while let Some(is_file) = is_file_checks.next().await {
3485                        if is_file {
3486                            has_files_to_open = true;
3487                            break;
3488                        }
3489                    }
3490                    drop(is_file_checks);
3491                    if !has_files_to_open {
3492                        split_direction = None;
3493                    }
3494
3495                    if let Ok((open_task, to_pane)) =
3496                        workspace.update_in(cx, |workspace, window, cx| {
3497                            if let Some(split_direction) = split_direction {
3498                                to_pane =
3499                                    workspace.split_pane(to_pane, split_direction, window, cx);
3500                            }
3501                            (
3502                                workspace.open_paths(
3503                                    paths,
3504                                    OpenOptions {
3505                                        visible: Some(OpenVisible::OnlyDirectories),
3506                                        ..Default::default()
3507                                    },
3508                                    Some(to_pane.downgrade()),
3509                                    window,
3510                                    cx,
3511                                ),
3512                                to_pane,
3513                            )
3514                        })
3515                    {
3516                        let opened_items: Vec<_> = open_task.await;
3517                        _ = workspace.update_in(cx, |workspace, window, cx| {
3518                            for item in opened_items.into_iter().flatten() {
3519                                if let Err(e) = item {
3520                                    workspace.show_error(&e, cx);
3521                                }
3522                            }
3523                            if to_pane.read(cx).items_len() == 0 {
3524                                workspace.remove_pane(to_pane, None, window, cx);
3525                            }
3526                        });
3527                    }
3528                })
3529                .detach();
3530            })
3531            .log_err();
3532    }
3533
3534    pub fn display_nav_history_buttons(&mut self, display: Option<bool>) {
3535        self.display_nav_history_buttons = display;
3536    }
3537
3538    fn pinned_item_ids(&self) -> Vec<EntityId> {
3539        self.items
3540            .iter()
3541            .enumerate()
3542            .filter_map(|(index, item)| {
3543                if self.is_tab_pinned(index) {
3544                    return Some(item.item_id());
3545                }
3546
3547                None
3548            })
3549            .collect()
3550    }
3551
3552    fn clean_item_ids(&self, cx: &mut Context<Pane>) -> Vec<EntityId> {
3553        self.items()
3554            .filter_map(|item| {
3555                if !item.is_dirty(cx) {
3556                    return Some(item.item_id());
3557                }
3558
3559                None
3560            })
3561            .collect()
3562    }
3563
3564    fn to_the_side_item_ids(&self, item_id: EntityId, side: Side) -> Vec<EntityId> {
3565        match side {
3566            Side::Left => self
3567                .items()
3568                .take_while(|item| item.item_id() != item_id)
3569                .map(|item| item.item_id())
3570                .collect(),
3571            Side::Right => self
3572                .items()
3573                .rev()
3574                .take_while(|item| item.item_id() != item_id)
3575                .map(|item| item.item_id())
3576                .collect(),
3577        }
3578    }
3579
3580    fn multibuffer_item_ids(&self, cx: &mut Context<Pane>) -> Vec<EntityId> {
3581        self.items()
3582            .filter(|item| item.buffer_kind(cx) == ItemBufferKind::Multibuffer)
3583            .map(|item| item.item_id())
3584            .collect()
3585    }
3586
3587    pub fn drag_split_direction(&self) -> Option<SplitDirection> {
3588        self.drag_split_direction
3589    }
3590
3591    pub fn set_zoom_out_on_close(&mut self, zoom_out_on_close: bool) {
3592        self.zoom_out_on_close = zoom_out_on_close;
3593    }
3594}
3595
3596fn default_render_tab_bar_buttons(
3597    pane: &mut Pane,
3598    window: &mut Window,
3599    cx: &mut Context<Pane>,
3600) -> (Option<AnyElement>, Option<AnyElement>) {
3601    if !pane.has_focus(window, cx) && !pane.context_menu_focused(window, cx) {
3602        return (None, None);
3603    }
3604    let (can_clone, can_split_move) = match pane.active_item() {
3605        Some(active_item) if active_item.can_split(cx) => (true, false),
3606        Some(_) => (false, pane.items_len() > 1),
3607        None => (false, false),
3608    };
3609    // Ideally we would return a vec of elements here to pass directly to the [TabBar]'s
3610    // `end_slot`, but due to needing a view here that isn't possible.
3611    let right_children = h_flex()
3612        // Instead we need to replicate the spacing from the [TabBar]'s `end_slot` here.
3613        .gap(DynamicSpacing::Base04.rems(cx))
3614        .child(
3615            PopoverMenu::new("pane-tab-bar-popover-menu")
3616                .trigger_with_tooltip(
3617                    IconButton::new("plus", IconName::Plus).icon_size(IconSize::Small),
3618                    Tooltip::text("New..."),
3619                )
3620                .anchor(Corner::TopRight)
3621                .with_handle(pane.new_item_context_menu_handle.clone())
3622                .menu(move |window, cx| {
3623                    Some(ContextMenu::build(window, cx, |menu, _, _| {
3624                        menu.action("New File", NewFile.boxed_clone())
3625                            .action("Open File", ToggleFileFinder::default().boxed_clone())
3626                            .separator()
3627                            .action(
3628                                "Search Project",
3629                                DeploySearch {
3630                                    replace_enabled: false,
3631                                    included_files: None,
3632                                    excluded_files: None,
3633                                }
3634                                .boxed_clone(),
3635                            )
3636                            .action("Search Symbols", ToggleProjectSymbols.boxed_clone())
3637                            .separator()
3638                            .action("New Terminal", NewTerminal.boxed_clone())
3639                    }))
3640                }),
3641        )
3642        .child(
3643            PopoverMenu::new("pane-tab-bar-split")
3644                .trigger_with_tooltip(
3645                    IconButton::new("split", IconName::Split)
3646                        .icon_size(IconSize::Small)
3647                        .disabled(!can_clone && !can_split_move),
3648                    Tooltip::text("Split Pane"),
3649                )
3650                .anchor(Corner::TopRight)
3651                .with_handle(pane.split_item_context_menu_handle.clone())
3652                .menu(move |window, cx| {
3653                    ContextMenu::build(window, cx, |menu, _, _| {
3654                        if can_split_move {
3655                            menu.action("Split Right", SplitAndMoveRight.boxed_clone())
3656                                .action("Split Left", SplitAndMoveLeft.boxed_clone())
3657                                .action("Split Up", SplitAndMoveUp.boxed_clone())
3658                                .action("Split Down", SplitAndMoveDown.boxed_clone())
3659                        } else {
3660                            menu.action("Split Right", SplitRight.boxed_clone())
3661                                .action("Split Left", SplitLeft.boxed_clone())
3662                                .action("Split Up", SplitUp.boxed_clone())
3663                                .action("Split Down", SplitDown.boxed_clone())
3664                        }
3665                    })
3666                    .into()
3667                }),
3668        )
3669        .child({
3670            let zoomed = pane.is_zoomed();
3671            IconButton::new("toggle_zoom", IconName::Maximize)
3672                .icon_size(IconSize::Small)
3673                .toggle_state(zoomed)
3674                .selected_icon(IconName::Minimize)
3675                .on_click(cx.listener(|pane, _, window, cx| {
3676                    pane.toggle_zoom(&crate::ToggleZoom, window, cx);
3677                }))
3678                .tooltip(move |_window, cx| {
3679                    Tooltip::for_action(
3680                        if zoomed { "Zoom Out" } else { "Zoom In" },
3681                        &ToggleZoom,
3682                        cx,
3683                    )
3684                })
3685        })
3686        .into_any_element()
3687        .into();
3688    (None, right_children)
3689}
3690
3691impl Focusable for Pane {
3692    fn focus_handle(&self, _cx: &App) -> FocusHandle {
3693        self.focus_handle.clone()
3694    }
3695}
3696
3697impl Render for Pane {
3698    fn render(&mut self, window: &mut Window, cx: &mut Context<Self>) -> impl IntoElement {
3699        let mut key_context = KeyContext::new_with_defaults();
3700        key_context.add("Pane");
3701        if self.active_item().is_none() {
3702            key_context.add("EmptyPane");
3703        }
3704
3705        self.toolbar
3706            .read(cx)
3707            .contribute_context(&mut key_context, cx);
3708
3709        let should_display_tab_bar = self.should_display_tab_bar.clone();
3710        let display_tab_bar = should_display_tab_bar(window, cx);
3711        let Some(project) = self.project.upgrade() else {
3712            return div().track_focus(&self.focus_handle(cx));
3713        };
3714        let is_local = project.read(cx).is_local();
3715
3716        v_flex()
3717            .key_context(key_context)
3718            .track_focus(&self.focus_handle(cx))
3719            .size_full()
3720            .flex_none()
3721            .overflow_hidden()
3722            .on_action(
3723                cx.listener(|pane, _: &SplitLeft, _, cx| pane.split(SplitDirection::Left, cx)),
3724            )
3725            .on_action(cx.listener(|pane, _: &SplitUp, _, cx| pane.split(SplitDirection::Up, cx)))
3726            .on_action(cx.listener(|pane, _: &SplitHorizontal, _, cx| {
3727                pane.split(SplitDirection::horizontal(cx), cx)
3728            }))
3729            .on_action(cx.listener(|pane, _: &SplitVertical, _, cx| {
3730                pane.split(SplitDirection::vertical(cx), cx)
3731            }))
3732            .on_action(
3733                cx.listener(|pane, _: &SplitRight, _, cx| pane.split(SplitDirection::Right, cx)),
3734            )
3735            .on_action(
3736                cx.listener(|pane, _: &SplitDown, _, cx| pane.split(SplitDirection::Down, cx)),
3737            )
3738            .on_action(cx.listener(|pane, _: &SplitAndMoveUp, _, cx| {
3739                pane.split_and_move(SplitDirection::Up, cx)
3740            }))
3741            .on_action(cx.listener(|pane, _: &SplitAndMoveDown, _, cx| {
3742                pane.split_and_move(SplitDirection::Down, cx)
3743            }))
3744            .on_action(cx.listener(|pane, _: &SplitAndMoveLeft, _, cx| {
3745                pane.split_and_move(SplitDirection::Left, cx)
3746            }))
3747            .on_action(cx.listener(|pane, _: &SplitAndMoveRight, _, cx| {
3748                pane.split_and_move(SplitDirection::Right, cx)
3749            }))
3750            .on_action(cx.listener(|_, _: &JoinIntoNext, _, cx| {
3751                cx.emit(Event::JoinIntoNext);
3752            }))
3753            .on_action(cx.listener(|_, _: &JoinAll, _, cx| {
3754                cx.emit(Event::JoinAll);
3755            }))
3756            .on_action(cx.listener(Pane::toggle_zoom))
3757            .on_action(cx.listener(Self::navigate_backward))
3758            .on_action(cx.listener(Self::navigate_forward))
3759            .on_action(
3760                cx.listener(|pane: &mut Pane, action: &ActivateItem, window, cx| {
3761                    pane.activate_item(
3762                        action.0.min(pane.items.len().saturating_sub(1)),
3763                        true,
3764                        true,
3765                        window,
3766                        cx,
3767                    );
3768                }),
3769            )
3770            .on_action(cx.listener(Self::alternate_file))
3771            .on_action(cx.listener(Self::activate_last_item))
3772            .on_action(cx.listener(Self::activate_previous_item))
3773            .on_action(cx.listener(Self::activate_next_item))
3774            .on_action(cx.listener(Self::swap_item_left))
3775            .on_action(cx.listener(Self::swap_item_right))
3776            .on_action(cx.listener(Self::toggle_pin_tab))
3777            .on_action(cx.listener(Self::unpin_all_tabs))
3778            .when(PreviewTabsSettings::get_global(cx).enabled, |this| {
3779                this.on_action(cx.listener(|pane: &mut Pane, _: &TogglePreviewTab, _, cx| {
3780                    if let Some(active_item_id) = pane.active_item().map(|i| i.item_id()) {
3781                        if pane.is_active_preview_item(active_item_id) {
3782                            pane.set_preview_item_id(None, cx);
3783                        } else {
3784                            pane.set_preview_item_id(Some(active_item_id), cx);
3785                        }
3786                    }
3787                }))
3788            })
3789            .on_action(
3790                cx.listener(|pane: &mut Self, action: &CloseActiveItem, window, cx| {
3791                    pane.close_active_item(action, window, cx)
3792                        .detach_and_log_err(cx)
3793                }),
3794            )
3795            .on_action(
3796                cx.listener(|pane: &mut Self, action: &CloseOtherItems, window, cx| {
3797                    pane.close_other_items(action, None, window, cx)
3798                        .detach_and_log_err(cx);
3799                }),
3800            )
3801            .on_action(
3802                cx.listener(|pane: &mut Self, action: &CloseCleanItems, window, cx| {
3803                    pane.close_clean_items(action, window, cx)
3804                        .detach_and_log_err(cx)
3805                }),
3806            )
3807            .on_action(cx.listener(
3808                |pane: &mut Self, action: &CloseItemsToTheLeft, window, cx| {
3809                    pane.close_items_to_the_left_by_id(None, action, window, cx)
3810                        .detach_and_log_err(cx)
3811                },
3812            ))
3813            .on_action(cx.listener(
3814                |pane: &mut Self, action: &CloseItemsToTheRight, window, cx| {
3815                    pane.close_items_to_the_right_by_id(None, action, window, cx)
3816                        .detach_and_log_err(cx)
3817                },
3818            ))
3819            .on_action(
3820                cx.listener(|pane: &mut Self, action: &CloseAllItems, window, cx| {
3821                    pane.close_all_items(action, window, cx)
3822                        .detach_and_log_err(cx)
3823                }),
3824            )
3825            .on_action(cx.listener(
3826                |pane: &mut Self, action: &CloseMultibufferItems, window, cx| {
3827                    pane.close_multibuffer_items(action, window, cx)
3828                        .detach_and_log_err(cx)
3829                },
3830            ))
3831            .on_action(
3832                cx.listener(|pane: &mut Self, action: &RevealInProjectPanel, _, cx| {
3833                    let entry_id = action
3834                        .entry_id
3835                        .map(ProjectEntryId::from_proto)
3836                        .or_else(|| pane.active_item()?.project_entry_ids(cx).first().copied());
3837                    if let Some(entry_id) = entry_id {
3838                        pane.project
3839                            .update(cx, |_, cx| {
3840                                cx.emit(project::Event::RevealInProjectPanel(entry_id))
3841                            })
3842                            .ok();
3843                    }
3844                }),
3845            )
3846            .on_action(cx.listener(|_, _: &menu::Cancel, window, cx| {
3847                if cx.stop_active_drag(window) {
3848                } else {
3849                    cx.propagate();
3850                }
3851            }))
3852            .when(self.active_item().is_some() && display_tab_bar, |pane| {
3853                pane.child((self.render_tab_bar.clone())(self, window, cx))
3854            })
3855            .child({
3856                let has_worktrees = project.read(cx).visible_worktrees(cx).next().is_some();
3857                // main content
3858                div()
3859                    .flex_1()
3860                    .relative()
3861                    .group("")
3862                    .overflow_hidden()
3863                    .on_drag_move::<DraggedTab>(cx.listener(Self::handle_drag_move))
3864                    .on_drag_move::<DraggedSelection>(cx.listener(Self::handle_drag_move))
3865                    .when(is_local, |div| {
3866                        div.on_drag_move::<ExternalPaths>(cx.listener(Self::handle_drag_move))
3867                    })
3868                    .map(|div| {
3869                        if let Some(item) = self.active_item() {
3870                            div.id("pane_placeholder")
3871                                .v_flex()
3872                                .size_full()
3873                                .overflow_hidden()
3874                                .child(self.toolbar.clone())
3875                                .child(item.to_any())
3876                        } else {
3877                            let placeholder = div
3878                                .id("pane_placeholder")
3879                                .h_flex()
3880                                .size_full()
3881                                .justify_center()
3882                                .on_click(cx.listener(
3883                                    move |this, event: &ClickEvent, window, cx| {
3884                                        if event.click_count() == 2 {
3885                                            window.dispatch_action(
3886                                                this.double_click_dispatch_action.boxed_clone(),
3887                                                cx,
3888                                            );
3889                                        }
3890                                    },
3891                                ));
3892                            if has_worktrees {
3893                                placeholder
3894                            } else {
3895                                placeholder.child(
3896                                    Label::new("Open a file or project to get started.")
3897                                        .color(Color::Muted),
3898                                )
3899                            }
3900                        }
3901                    })
3902                    .child(
3903                        // drag target
3904                        div()
3905                            .invisible()
3906                            .absolute()
3907                            .bg(cx.theme().colors().drop_target_background)
3908                            .group_drag_over::<DraggedTab>("", |style| style.visible())
3909                            .group_drag_over::<DraggedSelection>("", |style| style.visible())
3910                            .when(is_local, |div| {
3911                                div.group_drag_over::<ExternalPaths>("", |style| style.visible())
3912                            })
3913                            .when_some(self.can_drop_predicate.clone(), |this, p| {
3914                                this.can_drop(move |a, window, cx| p(a, window, cx))
3915                            })
3916                            .on_drop(cx.listener(move |this, dragged_tab, window, cx| {
3917                                this.handle_tab_drop(
3918                                    dragged_tab,
3919                                    this.active_item_index(),
3920                                    window,
3921                                    cx,
3922                                )
3923                            }))
3924                            .on_drop(cx.listener(
3925                                move |this, selection: &DraggedSelection, window, cx| {
3926                                    this.handle_dragged_selection_drop(selection, None, window, cx)
3927                                },
3928                            ))
3929                            .on_drop(cx.listener(move |this, paths, window, cx| {
3930                                this.handle_external_paths_drop(paths, window, cx)
3931                            }))
3932                            .map(|div| {
3933                                let size = DefiniteLength::Fraction(0.5);
3934                                match self.drag_split_direction {
3935                                    None => div.top_0().right_0().bottom_0().left_0(),
3936                                    Some(SplitDirection::Up) => {
3937                                        div.top_0().left_0().right_0().h(size)
3938                                    }
3939                                    Some(SplitDirection::Down) => {
3940                                        div.left_0().bottom_0().right_0().h(size)
3941                                    }
3942                                    Some(SplitDirection::Left) => {
3943                                        div.top_0().left_0().bottom_0().w(size)
3944                                    }
3945                                    Some(SplitDirection::Right) => {
3946                                        div.top_0().bottom_0().right_0().w(size)
3947                                    }
3948                                }
3949                            }),
3950                    )
3951            })
3952            .on_mouse_down(
3953                MouseButton::Navigate(NavigationDirection::Back),
3954                cx.listener(|pane, _, window, cx| {
3955                    if let Some(workspace) = pane.workspace.upgrade() {
3956                        let pane = cx.entity().downgrade();
3957                        window.defer(cx, move |window, cx| {
3958                            workspace.update(cx, |workspace, cx| {
3959                                workspace.go_back(pane, window, cx).detach_and_log_err(cx)
3960                            })
3961                        })
3962                    }
3963                }),
3964            )
3965            .on_mouse_down(
3966                MouseButton::Navigate(NavigationDirection::Forward),
3967                cx.listener(|pane, _, window, cx| {
3968                    if let Some(workspace) = pane.workspace.upgrade() {
3969                        let pane = cx.entity().downgrade();
3970                        window.defer(cx, move |window, cx| {
3971                            workspace.update(cx, |workspace, cx| {
3972                                workspace
3973                                    .go_forward(pane, window, cx)
3974                                    .detach_and_log_err(cx)
3975                            })
3976                        })
3977                    }
3978                }),
3979            )
3980    }
3981}
3982
3983impl ItemNavHistory {
3984    pub fn push<D: 'static + Send + Any>(&mut self, data: Option<D>, cx: &mut App) {
3985        if self
3986            .item
3987            .upgrade()
3988            .is_some_and(|item| item.include_in_nav_history())
3989        {
3990            self.history
3991                .push(data, self.item.clone(), self.is_preview, cx);
3992        }
3993    }
3994
3995    pub fn pop_backward(&mut self, cx: &mut App) -> Option<NavigationEntry> {
3996        self.history.pop(NavigationMode::GoingBack, cx)
3997    }
3998
3999    pub fn pop_forward(&mut self, cx: &mut App) -> Option<NavigationEntry> {
4000        self.history.pop(NavigationMode::GoingForward, cx)
4001    }
4002}
4003
4004impl NavHistory {
4005    pub fn for_each_entry(
4006        &self,
4007        cx: &App,
4008        mut f: impl FnMut(&NavigationEntry, (ProjectPath, Option<PathBuf>)),
4009    ) {
4010        let borrowed_history = self.0.lock();
4011        borrowed_history
4012            .forward_stack
4013            .iter()
4014            .chain(borrowed_history.backward_stack.iter())
4015            .chain(borrowed_history.closed_stack.iter())
4016            .for_each(|entry| {
4017                if let Some(project_and_abs_path) =
4018                    borrowed_history.paths_by_item.get(&entry.item.id())
4019                {
4020                    f(entry, project_and_abs_path.clone());
4021                } else if let Some(item) = entry.item.upgrade()
4022                    && let Some(path) = item.project_path(cx)
4023                {
4024                    f(entry, (path, None));
4025                }
4026            })
4027    }
4028
4029    pub fn set_mode(&mut self, mode: NavigationMode) {
4030        self.0.lock().mode = mode;
4031    }
4032
4033    pub fn mode(&self) -> NavigationMode {
4034        self.0.lock().mode
4035    }
4036
4037    pub fn disable(&mut self) {
4038        self.0.lock().mode = NavigationMode::Disabled;
4039    }
4040
4041    pub fn enable(&mut self) {
4042        self.0.lock().mode = NavigationMode::Normal;
4043    }
4044
4045    pub fn pop(&mut self, mode: NavigationMode, cx: &mut App) -> Option<NavigationEntry> {
4046        let mut state = self.0.lock();
4047        let entry = match mode {
4048            NavigationMode::Normal | NavigationMode::Disabled | NavigationMode::ClosingItem => {
4049                return None;
4050            }
4051            NavigationMode::GoingBack => &mut state.backward_stack,
4052            NavigationMode::GoingForward => &mut state.forward_stack,
4053            NavigationMode::ReopeningClosedItem => &mut state.closed_stack,
4054        }
4055        .pop_back();
4056        if entry.is_some() {
4057            state.did_update(cx);
4058        }
4059        entry
4060    }
4061
4062    pub fn push<D: 'static + Send + Any>(
4063        &mut self,
4064        data: Option<D>,
4065        item: Arc<dyn WeakItemHandle>,
4066        is_preview: bool,
4067        cx: &mut App,
4068    ) {
4069        let state = &mut *self.0.lock();
4070        match state.mode {
4071            NavigationMode::Disabled => {}
4072            NavigationMode::Normal | NavigationMode::ReopeningClosedItem => {
4073                if state.backward_stack.len() >= MAX_NAVIGATION_HISTORY_LEN {
4074                    state.backward_stack.pop_front();
4075                }
4076                state.backward_stack.push_back(NavigationEntry {
4077                    item,
4078                    data: data.map(|data| Box::new(data) as Box<dyn Any + Send>),
4079                    timestamp: state.next_timestamp.fetch_add(1, Ordering::SeqCst),
4080                    is_preview,
4081                });
4082                state.forward_stack.clear();
4083            }
4084            NavigationMode::GoingBack => {
4085                if state.forward_stack.len() >= MAX_NAVIGATION_HISTORY_LEN {
4086                    state.forward_stack.pop_front();
4087                }
4088                state.forward_stack.push_back(NavigationEntry {
4089                    item,
4090                    data: data.map(|data| Box::new(data) as Box<dyn Any + Send>),
4091                    timestamp: state.next_timestamp.fetch_add(1, Ordering::SeqCst),
4092                    is_preview,
4093                });
4094            }
4095            NavigationMode::GoingForward => {
4096                if state.backward_stack.len() >= MAX_NAVIGATION_HISTORY_LEN {
4097                    state.backward_stack.pop_front();
4098                }
4099                state.backward_stack.push_back(NavigationEntry {
4100                    item,
4101                    data: data.map(|data| Box::new(data) as Box<dyn Any + Send>),
4102                    timestamp: state.next_timestamp.fetch_add(1, Ordering::SeqCst),
4103                    is_preview,
4104                });
4105            }
4106            NavigationMode::ClosingItem => {
4107                if state.closed_stack.len() >= MAX_NAVIGATION_HISTORY_LEN {
4108                    state.closed_stack.pop_front();
4109                }
4110                state.closed_stack.push_back(NavigationEntry {
4111                    item,
4112                    data: data.map(|data| Box::new(data) as Box<dyn Any + Send>),
4113                    timestamp: state.next_timestamp.fetch_add(1, Ordering::SeqCst),
4114                    is_preview,
4115                });
4116            }
4117        }
4118        state.did_update(cx);
4119    }
4120
4121    pub fn remove_item(&mut self, item_id: EntityId) {
4122        let mut state = self.0.lock();
4123        state.paths_by_item.remove(&item_id);
4124        state
4125            .backward_stack
4126            .retain(|entry| entry.item.id() != item_id);
4127        state
4128            .forward_stack
4129            .retain(|entry| entry.item.id() != item_id);
4130        state
4131            .closed_stack
4132            .retain(|entry| entry.item.id() != item_id);
4133    }
4134
4135    pub fn path_for_item(&self, item_id: EntityId) -> Option<(ProjectPath, Option<PathBuf>)> {
4136        self.0.lock().paths_by_item.get(&item_id).cloned()
4137    }
4138}
4139
4140impl NavHistoryState {
4141    pub fn did_update(&self, cx: &mut App) {
4142        if let Some(pane) = self.pane.upgrade() {
4143            cx.defer(move |cx| {
4144                pane.update(cx, |pane, cx| pane.history_updated(cx));
4145            });
4146        }
4147    }
4148}
4149
4150fn dirty_message_for(buffer_path: Option<ProjectPath>, path_style: PathStyle) -> String {
4151    let path = buffer_path
4152        .as_ref()
4153        .and_then(|p| {
4154            let path = p.path.display(path_style);
4155            if path.is_empty() { None } else { Some(path) }
4156        })
4157        .unwrap_or("This buffer".into());
4158    let path = truncate_and_remove_front(&path, 80);
4159    format!("{path} contains unsaved edits. Do you want to save it?")
4160}
4161
4162pub fn tab_details(items: &[Box<dyn ItemHandle>], _window: &Window, cx: &App) -> Vec<usize> {
4163    let mut tab_details = items.iter().map(|_| 0).collect::<Vec<_>>();
4164    let mut tab_descriptions = HashMap::default();
4165    let mut done = false;
4166    while !done {
4167        done = true;
4168
4169        // Store item indices by their tab description.
4170        for (ix, (item, detail)) in items.iter().zip(&tab_details).enumerate() {
4171            let description = item.tab_content_text(*detail, cx);
4172            if *detail == 0 || description != item.tab_content_text(detail - 1, cx) {
4173                tab_descriptions
4174                    .entry(description)
4175                    .or_insert(Vec::new())
4176                    .push(ix);
4177            }
4178        }
4179
4180        // If two or more items have the same tab description, increase their level
4181        // of detail and try again.
4182        for (_, item_ixs) in tab_descriptions.drain() {
4183            if item_ixs.len() > 1 {
4184                done = false;
4185                for ix in item_ixs {
4186                    tab_details[ix] += 1;
4187                }
4188            }
4189        }
4190    }
4191
4192    tab_details
4193}
4194
4195pub fn render_item_indicator(item: Box<dyn ItemHandle>, cx: &App) -> Option<Indicator> {
4196    maybe!({
4197        let indicator_color = match (item.has_conflict(cx), item.is_dirty(cx)) {
4198            (true, _) => Color::Warning,
4199            (_, true) => Color::Accent,
4200            (false, false) => return None,
4201        };
4202
4203        Some(Indicator::dot().color(indicator_color))
4204    })
4205}
4206
4207impl Render for DraggedTab {
4208    fn render(&mut self, window: &mut Window, cx: &mut Context<Self>) -> impl IntoElement {
4209        let ui_font = ThemeSettings::get_global(cx).ui_font.clone();
4210        let label = self.item.tab_content(
4211            TabContentParams {
4212                detail: Some(self.detail),
4213                selected: false,
4214                preview: false,
4215                deemphasized: false,
4216            },
4217            window,
4218            cx,
4219        );
4220        Tab::new("")
4221            .toggle_state(self.is_active)
4222            .child(label)
4223            .render(window, cx)
4224            .font(ui_font)
4225    }
4226}
4227
4228#[cfg(test)]
4229mod tests {
4230    use std::num::NonZero;
4231
4232    use super::*;
4233    use crate::item::test::{TestItem, TestProjectItem};
4234    use gpui::{TestAppContext, VisualTestContext, size};
4235    use project::FakeFs;
4236    use settings::SettingsStore;
4237    use theme::LoadThemes;
4238    use util::TryFutureExt;
4239
4240    #[gpui::test]
4241    async fn test_add_item_capped_to_max_tabs(cx: &mut TestAppContext) {
4242        init_test(cx);
4243        let fs = FakeFs::new(cx.executor());
4244
4245        let project = Project::test(fs, None, cx).await;
4246        let (workspace, cx) =
4247            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
4248        let pane = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
4249
4250        for i in 0..7 {
4251            add_labeled_item(&pane, format!("{}", i).as_str(), false, cx);
4252        }
4253
4254        set_max_tabs(cx, Some(5));
4255        add_labeled_item(&pane, "7", false, cx);
4256        // Remove items to respect the max tab cap.
4257        assert_item_labels(&pane, ["3", "4", "5", "6", "7*"], cx);
4258        pane.update_in(cx, |pane, window, cx| {
4259            pane.activate_item(0, false, false, window, cx);
4260        });
4261        add_labeled_item(&pane, "X", false, cx);
4262        // Respect activation order.
4263        assert_item_labels(&pane, ["3", "X*", "5", "6", "7"], cx);
4264
4265        for i in 0..7 {
4266            add_labeled_item(&pane, format!("D{}", i).as_str(), true, cx);
4267        }
4268        // Keeps dirty items, even over max tab cap.
4269        assert_item_labels(
4270            &pane,
4271            ["D0^", "D1^", "D2^", "D3^", "D4^", "D5^", "D6*^"],
4272            cx,
4273        );
4274
4275        set_max_tabs(cx, None);
4276        for i in 0..7 {
4277            add_labeled_item(&pane, format!("N{}", i).as_str(), false, cx);
4278        }
4279        // No cap when max tabs is None.
4280        assert_item_labels(
4281            &pane,
4282            [
4283                "D0^", "D1^", "D2^", "D3^", "D4^", "D5^", "D6^", "N0", "N1", "N2", "N3", "N4",
4284                "N5", "N6*",
4285            ],
4286            cx,
4287        );
4288    }
4289
4290    #[gpui::test]
4291    async fn test_reduce_max_tabs_closes_existing_items(cx: &mut TestAppContext) {
4292        init_test(cx);
4293        let fs = FakeFs::new(cx.executor());
4294
4295        let project = Project::test(fs, None, cx).await;
4296        let (workspace, cx) =
4297            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
4298        let pane = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
4299
4300        add_labeled_item(&pane, "A", false, cx);
4301        add_labeled_item(&pane, "B", false, cx);
4302        let item_c = add_labeled_item(&pane, "C", false, cx);
4303        let item_d = add_labeled_item(&pane, "D", false, cx);
4304        add_labeled_item(&pane, "E", false, cx);
4305        add_labeled_item(&pane, "Settings", false, cx);
4306        assert_item_labels(&pane, ["A", "B", "C", "D", "E", "Settings*"], cx);
4307
4308        set_max_tabs(cx, Some(5));
4309        assert_item_labels(&pane, ["B", "C", "D", "E", "Settings*"], cx);
4310
4311        set_max_tabs(cx, Some(4));
4312        assert_item_labels(&pane, ["C", "D", "E", "Settings*"], cx);
4313
4314        pane.update_in(cx, |pane, window, cx| {
4315            let ix = pane.index_for_item_id(item_c.item_id()).unwrap();
4316            pane.pin_tab_at(ix, window, cx);
4317
4318            let ix = pane.index_for_item_id(item_d.item_id()).unwrap();
4319            pane.pin_tab_at(ix, window, cx);
4320        });
4321        assert_item_labels(&pane, ["C!", "D!", "E", "Settings*"], cx);
4322
4323        set_max_tabs(cx, Some(2));
4324        assert_item_labels(&pane, ["C!", "D!", "Settings*"], cx);
4325    }
4326
4327    #[gpui::test]
4328    async fn test_allow_pinning_dirty_item_at_max_tabs(cx: &mut TestAppContext) {
4329        init_test(cx);
4330        let fs = FakeFs::new(cx.executor());
4331
4332        let project = Project::test(fs, None, cx).await;
4333        let (workspace, cx) =
4334            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
4335        let pane = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
4336
4337        set_max_tabs(cx, Some(1));
4338        let item_a = add_labeled_item(&pane, "A", true, cx);
4339
4340        pane.update_in(cx, |pane, window, cx| {
4341            let ix = pane.index_for_item_id(item_a.item_id()).unwrap();
4342            pane.pin_tab_at(ix, window, cx);
4343        });
4344        assert_item_labels(&pane, ["A*^!"], cx);
4345    }
4346
4347    #[gpui::test]
4348    async fn test_allow_pinning_non_dirty_item_at_max_tabs(cx: &mut TestAppContext) {
4349        init_test(cx);
4350        let fs = FakeFs::new(cx.executor());
4351
4352        let project = Project::test(fs, None, cx).await;
4353        let (workspace, cx) =
4354            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
4355        let pane = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
4356
4357        set_max_tabs(cx, Some(1));
4358        let item_a = add_labeled_item(&pane, "A", false, cx);
4359
4360        pane.update_in(cx, |pane, window, cx| {
4361            let ix = pane.index_for_item_id(item_a.item_id()).unwrap();
4362            pane.pin_tab_at(ix, window, cx);
4363        });
4364        assert_item_labels(&pane, ["A*!"], cx);
4365    }
4366
4367    #[gpui::test]
4368    async fn test_pin_tabs_incrementally_at_max_capacity(cx: &mut TestAppContext) {
4369        init_test(cx);
4370        let fs = FakeFs::new(cx.executor());
4371
4372        let project = Project::test(fs, None, cx).await;
4373        let (workspace, cx) =
4374            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
4375        let pane = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
4376
4377        set_max_tabs(cx, Some(3));
4378
4379        let item_a = add_labeled_item(&pane, "A", false, cx);
4380        assert_item_labels(&pane, ["A*"], cx);
4381
4382        pane.update_in(cx, |pane, window, cx| {
4383            let ix = pane.index_for_item_id(item_a.item_id()).unwrap();
4384            pane.pin_tab_at(ix, window, cx);
4385        });
4386        assert_item_labels(&pane, ["A*!"], cx);
4387
4388        let item_b = add_labeled_item(&pane, "B", false, cx);
4389        assert_item_labels(&pane, ["A!", "B*"], cx);
4390
4391        pane.update_in(cx, |pane, window, cx| {
4392            let ix = pane.index_for_item_id(item_b.item_id()).unwrap();
4393            pane.pin_tab_at(ix, window, cx);
4394        });
4395        assert_item_labels(&pane, ["A!", "B*!"], cx);
4396
4397        let item_c = add_labeled_item(&pane, "C", false, cx);
4398        assert_item_labels(&pane, ["A!", "B!", "C*"], cx);
4399
4400        pane.update_in(cx, |pane, window, cx| {
4401            let ix = pane.index_for_item_id(item_c.item_id()).unwrap();
4402            pane.pin_tab_at(ix, window, cx);
4403        });
4404        assert_item_labels(&pane, ["A!", "B!", "C*!"], cx);
4405    }
4406
4407    #[gpui::test]
4408    async fn test_pin_tabs_left_to_right_after_opening_at_max_capacity(cx: &mut TestAppContext) {
4409        init_test(cx);
4410        let fs = FakeFs::new(cx.executor());
4411
4412        let project = Project::test(fs, None, cx).await;
4413        let (workspace, cx) =
4414            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
4415        let pane = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
4416
4417        set_max_tabs(cx, Some(3));
4418
4419        let item_a = add_labeled_item(&pane, "A", false, cx);
4420        assert_item_labels(&pane, ["A*"], cx);
4421
4422        let item_b = add_labeled_item(&pane, "B", false, cx);
4423        assert_item_labels(&pane, ["A", "B*"], cx);
4424
4425        let item_c = add_labeled_item(&pane, "C", false, cx);
4426        assert_item_labels(&pane, ["A", "B", "C*"], cx);
4427
4428        pane.update_in(cx, |pane, window, cx| {
4429            let ix = pane.index_for_item_id(item_a.item_id()).unwrap();
4430            pane.pin_tab_at(ix, window, cx);
4431        });
4432        assert_item_labels(&pane, ["A!", "B", "C*"], cx);
4433
4434        pane.update_in(cx, |pane, window, cx| {
4435            let ix = pane.index_for_item_id(item_b.item_id()).unwrap();
4436            pane.pin_tab_at(ix, window, cx);
4437        });
4438        assert_item_labels(&pane, ["A!", "B!", "C*"], cx);
4439
4440        pane.update_in(cx, |pane, window, cx| {
4441            let ix = pane.index_for_item_id(item_c.item_id()).unwrap();
4442            pane.pin_tab_at(ix, window, cx);
4443        });
4444        assert_item_labels(&pane, ["A!", "B!", "C*!"], cx);
4445    }
4446
4447    #[gpui::test]
4448    async fn test_pin_tabs_right_to_left_after_opening_at_max_capacity(cx: &mut TestAppContext) {
4449        init_test(cx);
4450        let fs = FakeFs::new(cx.executor());
4451
4452        let project = Project::test(fs, None, cx).await;
4453        let (workspace, cx) =
4454            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
4455        let pane = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
4456
4457        set_max_tabs(cx, Some(3));
4458
4459        let item_a = add_labeled_item(&pane, "A", false, cx);
4460        assert_item_labels(&pane, ["A*"], cx);
4461
4462        let item_b = add_labeled_item(&pane, "B", false, cx);
4463        assert_item_labels(&pane, ["A", "B*"], cx);
4464
4465        let item_c = add_labeled_item(&pane, "C", false, cx);
4466        assert_item_labels(&pane, ["A", "B", "C*"], cx);
4467
4468        pane.update_in(cx, |pane, window, cx| {
4469            let ix = pane.index_for_item_id(item_c.item_id()).unwrap();
4470            pane.pin_tab_at(ix, window, cx);
4471        });
4472        assert_item_labels(&pane, ["C*!", "A", "B"], cx);
4473
4474        pane.update_in(cx, |pane, window, cx| {
4475            let ix = pane.index_for_item_id(item_b.item_id()).unwrap();
4476            pane.pin_tab_at(ix, window, cx);
4477        });
4478        assert_item_labels(&pane, ["C*!", "B!", "A"], cx);
4479
4480        pane.update_in(cx, |pane, window, cx| {
4481            let ix = pane.index_for_item_id(item_a.item_id()).unwrap();
4482            pane.pin_tab_at(ix, window, cx);
4483        });
4484        assert_item_labels(&pane, ["C*!", "B!", "A!"], cx);
4485    }
4486
4487    #[gpui::test]
4488    async fn test_pinned_tabs_never_closed_at_max_tabs(cx: &mut TestAppContext) {
4489        init_test(cx);
4490        let fs = FakeFs::new(cx.executor());
4491
4492        let project = Project::test(fs, None, cx).await;
4493        let (workspace, cx) =
4494            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
4495        let pane = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
4496
4497        let item_a = add_labeled_item(&pane, "A", false, cx);
4498        pane.update_in(cx, |pane, window, cx| {
4499            let ix = pane.index_for_item_id(item_a.item_id()).unwrap();
4500            pane.pin_tab_at(ix, window, cx);
4501        });
4502
4503        let item_b = add_labeled_item(&pane, "B", false, cx);
4504        pane.update_in(cx, |pane, window, cx| {
4505            let ix = pane.index_for_item_id(item_b.item_id()).unwrap();
4506            pane.pin_tab_at(ix, window, cx);
4507        });
4508
4509        add_labeled_item(&pane, "C", false, cx);
4510        add_labeled_item(&pane, "D", false, cx);
4511        add_labeled_item(&pane, "E", false, cx);
4512        assert_item_labels(&pane, ["A!", "B!", "C", "D", "E*"], cx);
4513
4514        set_max_tabs(cx, Some(3));
4515        add_labeled_item(&pane, "F", false, cx);
4516        assert_item_labels(&pane, ["A!", "B!", "F*"], cx);
4517
4518        add_labeled_item(&pane, "G", false, cx);
4519        assert_item_labels(&pane, ["A!", "B!", "G*"], cx);
4520
4521        add_labeled_item(&pane, "H", false, cx);
4522        assert_item_labels(&pane, ["A!", "B!", "H*"], cx);
4523    }
4524
4525    #[gpui::test]
4526    async fn test_always_allows_one_unpinned_item_over_max_tabs_regardless_of_pinned_count(
4527        cx: &mut TestAppContext,
4528    ) {
4529        init_test(cx);
4530        let fs = FakeFs::new(cx.executor());
4531
4532        let project = Project::test(fs, None, cx).await;
4533        let (workspace, cx) =
4534            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
4535        let pane = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
4536
4537        set_max_tabs(cx, Some(3));
4538
4539        let item_a = add_labeled_item(&pane, "A", false, cx);
4540        pane.update_in(cx, |pane, window, cx| {
4541            let ix = pane.index_for_item_id(item_a.item_id()).unwrap();
4542            pane.pin_tab_at(ix, window, cx);
4543        });
4544
4545        let item_b = add_labeled_item(&pane, "B", false, cx);
4546        pane.update_in(cx, |pane, window, cx| {
4547            let ix = pane.index_for_item_id(item_b.item_id()).unwrap();
4548            pane.pin_tab_at(ix, window, cx);
4549        });
4550
4551        let item_c = add_labeled_item(&pane, "C", false, cx);
4552        pane.update_in(cx, |pane, window, cx| {
4553            let ix = pane.index_for_item_id(item_c.item_id()).unwrap();
4554            pane.pin_tab_at(ix, window, cx);
4555        });
4556
4557        assert_item_labels(&pane, ["A!", "B!", "C*!"], cx);
4558
4559        let item_d = add_labeled_item(&pane, "D", false, cx);
4560        assert_item_labels(&pane, ["A!", "B!", "C!", "D*"], cx);
4561
4562        pane.update_in(cx, |pane, window, cx| {
4563            let ix = pane.index_for_item_id(item_d.item_id()).unwrap();
4564            pane.pin_tab_at(ix, window, cx);
4565        });
4566        assert_item_labels(&pane, ["A!", "B!", "C!", "D*!"], cx);
4567
4568        add_labeled_item(&pane, "E", false, cx);
4569        assert_item_labels(&pane, ["A!", "B!", "C!", "D!", "E*"], cx);
4570
4571        add_labeled_item(&pane, "F", false, cx);
4572        assert_item_labels(&pane, ["A!", "B!", "C!", "D!", "F*"], cx);
4573    }
4574
4575    #[gpui::test]
4576    async fn test_can_open_one_item_when_all_tabs_are_dirty_at_max(cx: &mut TestAppContext) {
4577        init_test(cx);
4578        let fs = FakeFs::new(cx.executor());
4579
4580        let project = Project::test(fs, None, cx).await;
4581        let (workspace, cx) =
4582            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
4583        let pane = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
4584
4585        set_max_tabs(cx, Some(3));
4586
4587        add_labeled_item(&pane, "A", true, cx);
4588        assert_item_labels(&pane, ["A*^"], cx);
4589
4590        add_labeled_item(&pane, "B", true, cx);
4591        assert_item_labels(&pane, ["A^", "B*^"], cx);
4592
4593        add_labeled_item(&pane, "C", true, cx);
4594        assert_item_labels(&pane, ["A^", "B^", "C*^"], cx);
4595
4596        add_labeled_item(&pane, "D", false, cx);
4597        assert_item_labels(&pane, ["A^", "B^", "C^", "D*"], cx);
4598
4599        add_labeled_item(&pane, "E", false, cx);
4600        assert_item_labels(&pane, ["A^", "B^", "C^", "E*"], cx);
4601
4602        add_labeled_item(&pane, "F", false, cx);
4603        assert_item_labels(&pane, ["A^", "B^", "C^", "F*"], cx);
4604
4605        add_labeled_item(&pane, "G", true, cx);
4606        assert_item_labels(&pane, ["A^", "B^", "C^", "G*^"], cx);
4607    }
4608
4609    #[gpui::test]
4610    async fn test_toggle_pin_tab(cx: &mut TestAppContext) {
4611        init_test(cx);
4612        let fs = FakeFs::new(cx.executor());
4613
4614        let project = Project::test(fs, None, cx).await;
4615        let (workspace, cx) =
4616            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
4617        let pane = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
4618
4619        set_labeled_items(&pane, ["A", "B*", "C"], cx);
4620        assert_item_labels(&pane, ["A", "B*", "C"], cx);
4621
4622        pane.update_in(cx, |pane, window, cx| {
4623            pane.toggle_pin_tab(&TogglePinTab, window, cx);
4624        });
4625        assert_item_labels(&pane, ["B*!", "A", "C"], cx);
4626
4627        pane.update_in(cx, |pane, window, cx| {
4628            pane.toggle_pin_tab(&TogglePinTab, window, cx);
4629        });
4630        assert_item_labels(&pane, ["B*", "A", "C"], cx);
4631    }
4632
4633    #[gpui::test]
4634    async fn test_unpin_all_tabs(cx: &mut TestAppContext) {
4635        init_test(cx);
4636        let fs = FakeFs::new(cx.executor());
4637
4638        let project = Project::test(fs, None, cx).await;
4639        let (workspace, cx) =
4640            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
4641        let pane = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
4642
4643        // Unpin all, in an empty pane
4644        pane.update_in(cx, |pane, window, cx| {
4645            pane.unpin_all_tabs(&UnpinAllTabs, window, cx);
4646        });
4647
4648        assert_item_labels(&pane, [], cx);
4649
4650        let item_a = add_labeled_item(&pane, "A", false, cx);
4651        let item_b = add_labeled_item(&pane, "B", false, cx);
4652        let item_c = add_labeled_item(&pane, "C", false, cx);
4653        assert_item_labels(&pane, ["A", "B", "C*"], cx);
4654
4655        // Unpin all, when no tabs are pinned
4656        pane.update_in(cx, |pane, window, cx| {
4657            pane.unpin_all_tabs(&UnpinAllTabs, window, cx);
4658        });
4659
4660        assert_item_labels(&pane, ["A", "B", "C*"], cx);
4661
4662        // Pin inactive tabs only
4663        pane.update_in(cx, |pane, window, cx| {
4664            let ix = pane.index_for_item_id(item_a.item_id()).unwrap();
4665            pane.pin_tab_at(ix, window, cx);
4666
4667            let ix = pane.index_for_item_id(item_b.item_id()).unwrap();
4668            pane.pin_tab_at(ix, window, cx);
4669        });
4670        assert_item_labels(&pane, ["A!", "B!", "C*"], cx);
4671
4672        pane.update_in(cx, |pane, window, cx| {
4673            pane.unpin_all_tabs(&UnpinAllTabs, window, cx);
4674        });
4675
4676        assert_item_labels(&pane, ["A", "B", "C*"], cx);
4677
4678        // Pin all tabs
4679        pane.update_in(cx, |pane, window, cx| {
4680            let ix = pane.index_for_item_id(item_a.item_id()).unwrap();
4681            pane.pin_tab_at(ix, window, cx);
4682
4683            let ix = pane.index_for_item_id(item_b.item_id()).unwrap();
4684            pane.pin_tab_at(ix, window, cx);
4685
4686            let ix = pane.index_for_item_id(item_c.item_id()).unwrap();
4687            pane.pin_tab_at(ix, window, cx);
4688        });
4689        assert_item_labels(&pane, ["A!", "B!", "C*!"], cx);
4690
4691        // Activate middle tab
4692        pane.update_in(cx, |pane, window, cx| {
4693            pane.activate_item(1, false, false, window, cx);
4694        });
4695        assert_item_labels(&pane, ["A!", "B*!", "C!"], cx);
4696
4697        pane.update_in(cx, |pane, window, cx| {
4698            pane.unpin_all_tabs(&UnpinAllTabs, window, cx);
4699        });
4700
4701        // Order has not changed
4702        assert_item_labels(&pane, ["A", "B*", "C"], cx);
4703    }
4704
4705    #[gpui::test]
4706    async fn test_pinning_active_tab_without_position_change_maintains_focus(
4707        cx: &mut TestAppContext,
4708    ) {
4709        init_test(cx);
4710        let fs = FakeFs::new(cx.executor());
4711
4712        let project = Project::test(fs, None, cx).await;
4713        let (workspace, cx) =
4714            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
4715        let pane = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
4716
4717        // Add A
4718        let item_a = add_labeled_item(&pane, "A", false, cx);
4719        assert_item_labels(&pane, ["A*"], cx);
4720
4721        // Add B
4722        add_labeled_item(&pane, "B", false, cx);
4723        assert_item_labels(&pane, ["A", "B*"], cx);
4724
4725        // Activate A again
4726        pane.update_in(cx, |pane, window, cx| {
4727            let ix = pane.index_for_item_id(item_a.item_id()).unwrap();
4728            pane.activate_item(ix, true, true, window, cx);
4729        });
4730        assert_item_labels(&pane, ["A*", "B"], cx);
4731
4732        // Pin A - remains active
4733        pane.update_in(cx, |pane, window, cx| {
4734            let ix = pane.index_for_item_id(item_a.item_id()).unwrap();
4735            pane.pin_tab_at(ix, window, cx);
4736        });
4737        assert_item_labels(&pane, ["A*!", "B"], cx);
4738
4739        // Unpin A - remain active
4740        pane.update_in(cx, |pane, window, cx| {
4741            let ix = pane.index_for_item_id(item_a.item_id()).unwrap();
4742            pane.unpin_tab_at(ix, window, cx);
4743        });
4744        assert_item_labels(&pane, ["A*", "B"], cx);
4745    }
4746
4747    #[gpui::test]
4748    async fn test_pinning_active_tab_with_position_change_maintains_focus(cx: &mut TestAppContext) {
4749        init_test(cx);
4750        let fs = FakeFs::new(cx.executor());
4751
4752        let project = Project::test(fs, None, cx).await;
4753        let (workspace, cx) =
4754            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
4755        let pane = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
4756
4757        // Add A, B, C
4758        add_labeled_item(&pane, "A", false, cx);
4759        add_labeled_item(&pane, "B", false, cx);
4760        let item_c = add_labeled_item(&pane, "C", false, cx);
4761        assert_item_labels(&pane, ["A", "B", "C*"], cx);
4762
4763        // Pin C - moves to pinned area, remains active
4764        pane.update_in(cx, |pane, window, cx| {
4765            let ix = pane.index_for_item_id(item_c.item_id()).unwrap();
4766            pane.pin_tab_at(ix, window, cx);
4767        });
4768        assert_item_labels(&pane, ["C*!", "A", "B"], cx);
4769
4770        // Unpin C - moves after pinned area, remains active
4771        pane.update_in(cx, |pane, window, cx| {
4772            let ix = pane.index_for_item_id(item_c.item_id()).unwrap();
4773            pane.unpin_tab_at(ix, window, cx);
4774        });
4775        assert_item_labels(&pane, ["C*", "A", "B"], cx);
4776    }
4777
4778    #[gpui::test]
4779    async fn test_pinning_inactive_tab_without_position_change_preserves_existing_focus(
4780        cx: &mut TestAppContext,
4781    ) {
4782        init_test(cx);
4783        let fs = FakeFs::new(cx.executor());
4784
4785        let project = Project::test(fs, None, cx).await;
4786        let (workspace, cx) =
4787            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
4788        let pane = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
4789
4790        // Add A, B
4791        let item_a = add_labeled_item(&pane, "A", false, cx);
4792        add_labeled_item(&pane, "B", false, cx);
4793        assert_item_labels(&pane, ["A", "B*"], cx);
4794
4795        // Pin A - already in pinned area, B remains active
4796        pane.update_in(cx, |pane, window, cx| {
4797            let ix = pane.index_for_item_id(item_a.item_id()).unwrap();
4798            pane.pin_tab_at(ix, window, cx);
4799        });
4800        assert_item_labels(&pane, ["A!", "B*"], cx);
4801
4802        // Unpin A - stays in place, B remains active
4803        pane.update_in(cx, |pane, window, cx| {
4804            let ix = pane.index_for_item_id(item_a.item_id()).unwrap();
4805            pane.unpin_tab_at(ix, window, cx);
4806        });
4807        assert_item_labels(&pane, ["A", "B*"], cx);
4808    }
4809
4810    #[gpui::test]
4811    async fn test_pinning_inactive_tab_with_position_change_preserves_existing_focus(
4812        cx: &mut TestAppContext,
4813    ) {
4814        init_test(cx);
4815        let fs = FakeFs::new(cx.executor());
4816
4817        let project = Project::test(fs, None, cx).await;
4818        let (workspace, cx) =
4819            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
4820        let pane = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
4821
4822        // Add A, B, C
4823        add_labeled_item(&pane, "A", false, cx);
4824        let item_b = add_labeled_item(&pane, "B", false, cx);
4825        let item_c = add_labeled_item(&pane, "C", false, cx);
4826        assert_item_labels(&pane, ["A", "B", "C*"], cx);
4827
4828        // Activate B
4829        pane.update_in(cx, |pane, window, cx| {
4830            let ix = pane.index_for_item_id(item_b.item_id()).unwrap();
4831            pane.activate_item(ix, true, true, window, cx);
4832        });
4833        assert_item_labels(&pane, ["A", "B*", "C"], cx);
4834
4835        // Pin C - moves to pinned area, B remains active
4836        pane.update_in(cx, |pane, window, cx| {
4837            let ix = pane.index_for_item_id(item_c.item_id()).unwrap();
4838            pane.pin_tab_at(ix, window, cx);
4839        });
4840        assert_item_labels(&pane, ["C!", "A", "B*"], cx);
4841
4842        // Unpin C - moves after pinned area, B remains active
4843        pane.update_in(cx, |pane, window, cx| {
4844            let ix = pane.index_for_item_id(item_c.item_id()).unwrap();
4845            pane.unpin_tab_at(ix, window, cx);
4846        });
4847        assert_item_labels(&pane, ["C", "A", "B*"], cx);
4848    }
4849
4850    #[gpui::test]
4851    async fn test_drag_unpinned_tab_to_split_creates_pane_with_unpinned_tab(
4852        cx: &mut TestAppContext,
4853    ) {
4854        init_test(cx);
4855        let fs = FakeFs::new(cx.executor());
4856
4857        let project = Project::test(fs, None, cx).await;
4858        let (workspace, cx) =
4859            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
4860        let pane_a = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
4861
4862        // Add A, B. Pin B. Activate A
4863        let item_a = add_labeled_item(&pane_a, "A", false, cx);
4864        let item_b = add_labeled_item(&pane_a, "B", false, cx);
4865
4866        pane_a.update_in(cx, |pane, window, cx| {
4867            let ix = pane.index_for_item_id(item_b.item_id()).unwrap();
4868            pane.pin_tab_at(ix, window, cx);
4869
4870            let ix = pane.index_for_item_id(item_a.item_id()).unwrap();
4871            pane.activate_item(ix, true, true, window, cx);
4872        });
4873
4874        // Drag A to create new split
4875        pane_a.update_in(cx, |pane, window, cx| {
4876            pane.drag_split_direction = Some(SplitDirection::Right);
4877
4878            let dragged_tab = DraggedTab {
4879                pane: pane_a.clone(),
4880                item: item_a.boxed_clone(),
4881                ix: 0,
4882                detail: 0,
4883                is_active: true,
4884            };
4885            pane.handle_tab_drop(&dragged_tab, 0, window, cx);
4886        });
4887
4888        // A should be moved to new pane. B should remain pinned, A should not be pinned
4889        let (pane_a, pane_b) = workspace.read_with(cx, |workspace, _| {
4890            let panes = workspace.panes();
4891            (panes[0].clone(), panes[1].clone())
4892        });
4893        assert_item_labels(&pane_a, ["B*!"], cx);
4894        assert_item_labels(&pane_b, ["A*"], cx);
4895    }
4896
4897    #[gpui::test]
4898    async fn test_drag_pinned_tab_to_split_creates_pane_with_pinned_tab(cx: &mut TestAppContext) {
4899        init_test(cx);
4900        let fs = FakeFs::new(cx.executor());
4901
4902        let project = Project::test(fs, None, cx).await;
4903        let (workspace, cx) =
4904            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
4905        let pane_a = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
4906
4907        // Add A, B. Pin both. Activate A
4908        let item_a = add_labeled_item(&pane_a, "A", false, cx);
4909        let item_b = add_labeled_item(&pane_a, "B", false, cx);
4910
4911        pane_a.update_in(cx, |pane, window, cx| {
4912            let ix = pane.index_for_item_id(item_a.item_id()).unwrap();
4913            pane.pin_tab_at(ix, window, cx);
4914
4915            let ix = pane.index_for_item_id(item_b.item_id()).unwrap();
4916            pane.pin_tab_at(ix, window, cx);
4917
4918            let ix = pane.index_for_item_id(item_a.item_id()).unwrap();
4919            pane.activate_item(ix, true, true, window, cx);
4920        });
4921        assert_item_labels(&pane_a, ["A*!", "B!"], cx);
4922
4923        // Drag A to create new split
4924        pane_a.update_in(cx, |pane, window, cx| {
4925            pane.drag_split_direction = Some(SplitDirection::Right);
4926
4927            let dragged_tab = DraggedTab {
4928                pane: pane_a.clone(),
4929                item: item_a.boxed_clone(),
4930                ix: 0,
4931                detail: 0,
4932                is_active: true,
4933            };
4934            pane.handle_tab_drop(&dragged_tab, 0, window, cx);
4935        });
4936
4937        // A should be moved to new pane. Both A and B should still be pinned
4938        let (pane_a, pane_b) = workspace.read_with(cx, |workspace, _| {
4939            let panes = workspace.panes();
4940            (panes[0].clone(), panes[1].clone())
4941        });
4942        assert_item_labels(&pane_a, ["B*!"], cx);
4943        assert_item_labels(&pane_b, ["A*!"], cx);
4944    }
4945
4946    #[gpui::test]
4947    async fn test_drag_pinned_tab_into_existing_panes_pinned_region(cx: &mut TestAppContext) {
4948        init_test(cx);
4949        let fs = FakeFs::new(cx.executor());
4950
4951        let project = Project::test(fs, None, cx).await;
4952        let (workspace, cx) =
4953            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
4954        let pane_a = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
4955
4956        // Add A to pane A and pin
4957        let item_a = add_labeled_item(&pane_a, "A", false, cx);
4958        pane_a.update_in(cx, |pane, window, cx| {
4959            let ix = pane.index_for_item_id(item_a.item_id()).unwrap();
4960            pane.pin_tab_at(ix, window, cx);
4961        });
4962        assert_item_labels(&pane_a, ["A*!"], cx);
4963
4964        // Add B to pane B and pin
4965        let pane_b = workspace.update_in(cx, |workspace, window, cx| {
4966            workspace.split_pane(pane_a.clone(), SplitDirection::Right, window, cx)
4967        });
4968        let item_b = add_labeled_item(&pane_b, "B", false, cx);
4969        pane_b.update_in(cx, |pane, window, cx| {
4970            let ix = pane.index_for_item_id(item_b.item_id()).unwrap();
4971            pane.pin_tab_at(ix, window, cx);
4972        });
4973        assert_item_labels(&pane_b, ["B*!"], cx);
4974
4975        // Move A from pane A to pane B's pinned region
4976        pane_b.update_in(cx, |pane, window, cx| {
4977            let dragged_tab = DraggedTab {
4978                pane: pane_a.clone(),
4979                item: item_a.boxed_clone(),
4980                ix: 0,
4981                detail: 0,
4982                is_active: true,
4983            };
4984            pane.handle_tab_drop(&dragged_tab, 0, window, cx);
4985        });
4986
4987        // A should stay pinned
4988        assert_item_labels(&pane_a, [], cx);
4989        assert_item_labels(&pane_b, ["A*!", "B!"], cx);
4990    }
4991
4992    #[gpui::test]
4993    async fn test_drag_pinned_tab_into_existing_panes_unpinned_region(cx: &mut TestAppContext) {
4994        init_test(cx);
4995        let fs = FakeFs::new(cx.executor());
4996
4997        let project = Project::test(fs, None, cx).await;
4998        let (workspace, cx) =
4999            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
5000        let pane_a = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
5001
5002        // Add A to pane A and pin
5003        let item_a = add_labeled_item(&pane_a, "A", false, cx);
5004        pane_a.update_in(cx, |pane, window, cx| {
5005            let ix = pane.index_for_item_id(item_a.item_id()).unwrap();
5006            pane.pin_tab_at(ix, window, cx);
5007        });
5008        assert_item_labels(&pane_a, ["A*!"], cx);
5009
5010        // Create pane B with pinned item B
5011        let pane_b = workspace.update_in(cx, |workspace, window, cx| {
5012            workspace.split_pane(pane_a.clone(), SplitDirection::Right, window, cx)
5013        });
5014        let item_b = add_labeled_item(&pane_b, "B", false, cx);
5015        assert_item_labels(&pane_b, ["B*"], cx);
5016
5017        pane_b.update_in(cx, |pane, window, cx| {
5018            let ix = pane.index_for_item_id(item_b.item_id()).unwrap();
5019            pane.pin_tab_at(ix, window, cx);
5020        });
5021        assert_item_labels(&pane_b, ["B*!"], cx);
5022
5023        // Move A from pane A to pane B's unpinned region
5024        pane_b.update_in(cx, |pane, window, cx| {
5025            let dragged_tab = DraggedTab {
5026                pane: pane_a.clone(),
5027                item: item_a.boxed_clone(),
5028                ix: 0,
5029                detail: 0,
5030                is_active: true,
5031            };
5032            pane.handle_tab_drop(&dragged_tab, 1, window, cx);
5033        });
5034
5035        // A should become pinned
5036        assert_item_labels(&pane_a, [], cx);
5037        assert_item_labels(&pane_b, ["B!", "A*"], cx);
5038    }
5039
5040    #[gpui::test]
5041    async fn test_drag_pinned_tab_into_existing_panes_first_position_with_no_pinned_tabs(
5042        cx: &mut TestAppContext,
5043    ) {
5044        init_test(cx);
5045        let fs = FakeFs::new(cx.executor());
5046
5047        let project = Project::test(fs, None, cx).await;
5048        let (workspace, cx) =
5049            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
5050        let pane_a = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
5051
5052        // Add A to pane A and pin
5053        let item_a = add_labeled_item(&pane_a, "A", false, cx);
5054        pane_a.update_in(cx, |pane, window, cx| {
5055            let ix = pane.index_for_item_id(item_a.item_id()).unwrap();
5056            pane.pin_tab_at(ix, window, cx);
5057        });
5058        assert_item_labels(&pane_a, ["A*!"], cx);
5059
5060        // Add B to pane B
5061        let pane_b = workspace.update_in(cx, |workspace, window, cx| {
5062            workspace.split_pane(pane_a.clone(), SplitDirection::Right, window, cx)
5063        });
5064        add_labeled_item(&pane_b, "B", false, cx);
5065        assert_item_labels(&pane_b, ["B*"], cx);
5066
5067        // Move A from pane A to position 0 in pane B, indicating it should stay pinned
5068        pane_b.update_in(cx, |pane, window, cx| {
5069            let dragged_tab = DraggedTab {
5070                pane: pane_a.clone(),
5071                item: item_a.boxed_clone(),
5072                ix: 0,
5073                detail: 0,
5074                is_active: true,
5075            };
5076            pane.handle_tab_drop(&dragged_tab, 0, window, cx);
5077        });
5078
5079        // A should stay pinned
5080        assert_item_labels(&pane_a, [], cx);
5081        assert_item_labels(&pane_b, ["A*!", "B"], cx);
5082    }
5083
5084    #[gpui::test]
5085    async fn test_drag_pinned_tab_into_existing_pane_at_max_capacity_closes_unpinned_tabs(
5086        cx: &mut TestAppContext,
5087    ) {
5088        init_test(cx);
5089        let fs = FakeFs::new(cx.executor());
5090
5091        let project = Project::test(fs, None, cx).await;
5092        let (workspace, cx) =
5093            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
5094        let pane_a = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
5095        set_max_tabs(cx, Some(2));
5096
5097        // Add A, B to pane A. Pin both
5098        let item_a = add_labeled_item(&pane_a, "A", false, cx);
5099        let item_b = add_labeled_item(&pane_a, "B", false, cx);
5100        pane_a.update_in(cx, |pane, window, cx| {
5101            let ix = pane.index_for_item_id(item_a.item_id()).unwrap();
5102            pane.pin_tab_at(ix, window, cx);
5103
5104            let ix = pane.index_for_item_id(item_b.item_id()).unwrap();
5105            pane.pin_tab_at(ix, window, cx);
5106        });
5107        assert_item_labels(&pane_a, ["A!", "B*!"], cx);
5108
5109        // Add C, D to pane B. Pin both
5110        let pane_b = workspace.update_in(cx, |workspace, window, cx| {
5111            workspace.split_pane(pane_a.clone(), SplitDirection::Right, window, cx)
5112        });
5113        let item_c = add_labeled_item(&pane_b, "C", false, cx);
5114        let item_d = add_labeled_item(&pane_b, "D", false, cx);
5115        pane_b.update_in(cx, |pane, window, cx| {
5116            let ix = pane.index_for_item_id(item_c.item_id()).unwrap();
5117            pane.pin_tab_at(ix, window, cx);
5118
5119            let ix = pane.index_for_item_id(item_d.item_id()).unwrap();
5120            pane.pin_tab_at(ix, window, cx);
5121        });
5122        assert_item_labels(&pane_b, ["C!", "D*!"], cx);
5123
5124        // Add a third unpinned item to pane B (exceeds max tabs), but is allowed,
5125        // as we allow 1 tab over max if the others are pinned or dirty
5126        add_labeled_item(&pane_b, "E", false, cx);
5127        assert_item_labels(&pane_b, ["C!", "D!", "E*"], cx);
5128
5129        // Drag pinned A from pane A to position 0 in pane B
5130        pane_b.update_in(cx, |pane, window, cx| {
5131            let dragged_tab = DraggedTab {
5132                pane: pane_a.clone(),
5133                item: item_a.boxed_clone(),
5134                ix: 0,
5135                detail: 0,
5136                is_active: true,
5137            };
5138            pane.handle_tab_drop(&dragged_tab, 0, window, cx);
5139        });
5140
5141        // E (unpinned) should be closed, leaving 3 pinned items
5142        assert_item_labels(&pane_a, ["B*!"], cx);
5143        assert_item_labels(&pane_b, ["A*!", "C!", "D!"], cx);
5144    }
5145
5146    #[gpui::test]
5147    async fn test_drag_last_pinned_tab_to_same_position_stays_pinned(cx: &mut TestAppContext) {
5148        init_test(cx);
5149        let fs = FakeFs::new(cx.executor());
5150
5151        let project = Project::test(fs, None, cx).await;
5152        let (workspace, cx) =
5153            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
5154        let pane_a = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
5155
5156        // Add A to pane A and pin it
5157        let item_a = add_labeled_item(&pane_a, "A", false, cx);
5158        pane_a.update_in(cx, |pane, window, cx| {
5159            let ix = pane.index_for_item_id(item_a.item_id()).unwrap();
5160            pane.pin_tab_at(ix, window, cx);
5161        });
5162        assert_item_labels(&pane_a, ["A*!"], cx);
5163
5164        // Drag pinned A to position 1 (directly to the right) in the same pane
5165        pane_a.update_in(cx, |pane, window, cx| {
5166            let dragged_tab = DraggedTab {
5167                pane: pane_a.clone(),
5168                item: item_a.boxed_clone(),
5169                ix: 0,
5170                detail: 0,
5171                is_active: true,
5172            };
5173            pane.handle_tab_drop(&dragged_tab, 1, window, cx);
5174        });
5175
5176        // A should still be pinned and active
5177        assert_item_labels(&pane_a, ["A*!"], cx);
5178    }
5179
5180    #[gpui::test]
5181    async fn test_drag_pinned_tab_beyond_last_pinned_tab_in_same_pane_stays_pinned(
5182        cx: &mut TestAppContext,
5183    ) {
5184        init_test(cx);
5185        let fs = FakeFs::new(cx.executor());
5186
5187        let project = Project::test(fs, None, cx).await;
5188        let (workspace, cx) =
5189            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
5190        let pane_a = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
5191
5192        // Add A, B to pane A and pin both
5193        let item_a = add_labeled_item(&pane_a, "A", false, cx);
5194        let item_b = add_labeled_item(&pane_a, "B", false, cx);
5195        pane_a.update_in(cx, |pane, window, cx| {
5196            let ix = pane.index_for_item_id(item_a.item_id()).unwrap();
5197            pane.pin_tab_at(ix, window, cx);
5198
5199            let ix = pane.index_for_item_id(item_b.item_id()).unwrap();
5200            pane.pin_tab_at(ix, window, cx);
5201        });
5202        assert_item_labels(&pane_a, ["A!", "B*!"], cx);
5203
5204        // Drag pinned A right of B in the same pane
5205        pane_a.update_in(cx, |pane, window, cx| {
5206            let dragged_tab = DraggedTab {
5207                pane: pane_a.clone(),
5208                item: item_a.boxed_clone(),
5209                ix: 0,
5210                detail: 0,
5211                is_active: true,
5212            };
5213            pane.handle_tab_drop(&dragged_tab, 2, window, cx);
5214        });
5215
5216        // A stays pinned
5217        assert_item_labels(&pane_a, ["B!", "A*!"], cx);
5218    }
5219
5220    #[gpui::test]
5221    async fn test_dragging_pinned_tab_onto_unpinned_tab_reduces_unpinned_tab_count(
5222        cx: &mut TestAppContext,
5223    ) {
5224        init_test(cx);
5225        let fs = FakeFs::new(cx.executor());
5226
5227        let project = Project::test(fs, None, cx).await;
5228        let (workspace, cx) =
5229            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
5230        let pane_a = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
5231
5232        // Add A, B to pane A and pin A
5233        let item_a = add_labeled_item(&pane_a, "A", false, cx);
5234        add_labeled_item(&pane_a, "B", false, cx);
5235        pane_a.update_in(cx, |pane, window, cx| {
5236            let ix = pane.index_for_item_id(item_a.item_id()).unwrap();
5237            pane.pin_tab_at(ix, window, cx);
5238        });
5239        assert_item_labels(&pane_a, ["A!", "B*"], cx);
5240
5241        // Drag pinned A on top of B in the same pane, which changes tab order to B, A
5242        pane_a.update_in(cx, |pane, window, cx| {
5243            let dragged_tab = DraggedTab {
5244                pane: pane_a.clone(),
5245                item: item_a.boxed_clone(),
5246                ix: 0,
5247                detail: 0,
5248                is_active: true,
5249            };
5250            pane.handle_tab_drop(&dragged_tab, 1, window, cx);
5251        });
5252
5253        // Neither are pinned
5254        assert_item_labels(&pane_a, ["B", "A*"], cx);
5255    }
5256
5257    #[gpui::test]
5258    async fn test_drag_pinned_tab_beyond_unpinned_tab_in_same_pane_becomes_unpinned(
5259        cx: &mut TestAppContext,
5260    ) {
5261        init_test(cx);
5262        let fs = FakeFs::new(cx.executor());
5263
5264        let project = Project::test(fs, None, cx).await;
5265        let (workspace, cx) =
5266            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
5267        let pane_a = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
5268
5269        // Add A, B to pane A and pin A
5270        let item_a = add_labeled_item(&pane_a, "A", false, cx);
5271        add_labeled_item(&pane_a, "B", false, cx);
5272        pane_a.update_in(cx, |pane, window, cx| {
5273            let ix = pane.index_for_item_id(item_a.item_id()).unwrap();
5274            pane.pin_tab_at(ix, window, cx);
5275        });
5276        assert_item_labels(&pane_a, ["A!", "B*"], cx);
5277
5278        // Drag pinned A right of B in the same pane
5279        pane_a.update_in(cx, |pane, window, cx| {
5280            let dragged_tab = DraggedTab {
5281                pane: pane_a.clone(),
5282                item: item_a.boxed_clone(),
5283                ix: 0,
5284                detail: 0,
5285                is_active: true,
5286            };
5287            pane.handle_tab_drop(&dragged_tab, 2, window, cx);
5288        });
5289
5290        // A becomes unpinned
5291        assert_item_labels(&pane_a, ["B", "A*"], cx);
5292    }
5293
5294    #[gpui::test]
5295    async fn test_drag_unpinned_tab_in_front_of_pinned_tab_in_same_pane_becomes_pinned(
5296        cx: &mut TestAppContext,
5297    ) {
5298        init_test(cx);
5299        let fs = FakeFs::new(cx.executor());
5300
5301        let project = Project::test(fs, None, cx).await;
5302        let (workspace, cx) =
5303            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
5304        let pane_a = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
5305
5306        // Add A, B to pane A and pin A
5307        let item_a = add_labeled_item(&pane_a, "A", false, cx);
5308        let item_b = add_labeled_item(&pane_a, "B", false, cx);
5309        pane_a.update_in(cx, |pane, window, cx| {
5310            let ix = pane.index_for_item_id(item_a.item_id()).unwrap();
5311            pane.pin_tab_at(ix, window, cx);
5312        });
5313        assert_item_labels(&pane_a, ["A!", "B*"], cx);
5314
5315        // Drag pinned B left of A in the same pane
5316        pane_a.update_in(cx, |pane, window, cx| {
5317            let dragged_tab = DraggedTab {
5318                pane: pane_a.clone(),
5319                item: item_b.boxed_clone(),
5320                ix: 1,
5321                detail: 0,
5322                is_active: true,
5323            };
5324            pane.handle_tab_drop(&dragged_tab, 0, window, cx);
5325        });
5326
5327        // A becomes unpinned
5328        assert_item_labels(&pane_a, ["B*!", "A!"], cx);
5329    }
5330
5331    #[gpui::test]
5332    async fn test_drag_unpinned_tab_to_the_pinned_region_stays_pinned(cx: &mut TestAppContext) {
5333        init_test(cx);
5334        let fs = FakeFs::new(cx.executor());
5335
5336        let project = Project::test(fs, None, cx).await;
5337        let (workspace, cx) =
5338            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
5339        let pane_a = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
5340
5341        // Add A, B, C to pane A and pin A
5342        let item_a = add_labeled_item(&pane_a, "A", false, cx);
5343        add_labeled_item(&pane_a, "B", false, cx);
5344        let item_c = add_labeled_item(&pane_a, "C", false, cx);
5345        pane_a.update_in(cx, |pane, window, cx| {
5346            let ix = pane.index_for_item_id(item_a.item_id()).unwrap();
5347            pane.pin_tab_at(ix, window, cx);
5348        });
5349        assert_item_labels(&pane_a, ["A!", "B", "C*"], cx);
5350
5351        // Drag pinned C left of B in the same pane
5352        pane_a.update_in(cx, |pane, window, cx| {
5353            let dragged_tab = DraggedTab {
5354                pane: pane_a.clone(),
5355                item: item_c.boxed_clone(),
5356                ix: 2,
5357                detail: 0,
5358                is_active: true,
5359            };
5360            pane.handle_tab_drop(&dragged_tab, 1, window, cx);
5361        });
5362
5363        // A stays pinned, B and C remain unpinned
5364        assert_item_labels(&pane_a, ["A!", "C*", "B"], cx);
5365    }
5366
5367    #[gpui::test]
5368    async fn test_drag_unpinned_tab_into_existing_panes_pinned_region(cx: &mut TestAppContext) {
5369        init_test(cx);
5370        let fs = FakeFs::new(cx.executor());
5371
5372        let project = Project::test(fs, None, cx).await;
5373        let (workspace, cx) =
5374            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
5375        let pane_a = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
5376
5377        // Add unpinned item A to pane A
5378        let item_a = add_labeled_item(&pane_a, "A", false, cx);
5379        assert_item_labels(&pane_a, ["A*"], cx);
5380
5381        // Create pane B with pinned item B
5382        let pane_b = workspace.update_in(cx, |workspace, window, cx| {
5383            workspace.split_pane(pane_a.clone(), SplitDirection::Right, window, cx)
5384        });
5385        let item_b = add_labeled_item(&pane_b, "B", false, cx);
5386        pane_b.update_in(cx, |pane, window, cx| {
5387            let ix = pane.index_for_item_id(item_b.item_id()).unwrap();
5388            pane.pin_tab_at(ix, window, cx);
5389        });
5390        assert_item_labels(&pane_b, ["B*!"], cx);
5391
5392        // Move A from pane A to pane B's pinned region
5393        pane_b.update_in(cx, |pane, window, cx| {
5394            let dragged_tab = DraggedTab {
5395                pane: pane_a.clone(),
5396                item: item_a.boxed_clone(),
5397                ix: 0,
5398                detail: 0,
5399                is_active: true,
5400            };
5401            pane.handle_tab_drop(&dragged_tab, 0, window, cx);
5402        });
5403
5404        // A should become pinned since it was dropped in the pinned region
5405        assert_item_labels(&pane_a, [], cx);
5406        assert_item_labels(&pane_b, ["A*!", "B!"], cx);
5407    }
5408
5409    #[gpui::test]
5410    async fn test_drag_unpinned_tab_into_existing_panes_unpinned_region(cx: &mut TestAppContext) {
5411        init_test(cx);
5412        let fs = FakeFs::new(cx.executor());
5413
5414        let project = Project::test(fs, None, cx).await;
5415        let (workspace, cx) =
5416            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
5417        let pane_a = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
5418
5419        // Add unpinned item A to pane A
5420        let item_a = add_labeled_item(&pane_a, "A", false, cx);
5421        assert_item_labels(&pane_a, ["A*"], cx);
5422
5423        // Create pane B with one pinned item B
5424        let pane_b = workspace.update_in(cx, |workspace, window, cx| {
5425            workspace.split_pane(pane_a.clone(), SplitDirection::Right, window, cx)
5426        });
5427        let item_b = add_labeled_item(&pane_b, "B", false, cx);
5428        pane_b.update_in(cx, |pane, window, cx| {
5429            let ix = pane.index_for_item_id(item_b.item_id()).unwrap();
5430            pane.pin_tab_at(ix, window, cx);
5431        });
5432        assert_item_labels(&pane_b, ["B*!"], cx);
5433
5434        // Move A from pane A to pane B's unpinned region
5435        pane_b.update_in(cx, |pane, window, cx| {
5436            let dragged_tab = DraggedTab {
5437                pane: pane_a.clone(),
5438                item: item_a.boxed_clone(),
5439                ix: 0,
5440                detail: 0,
5441                is_active: true,
5442            };
5443            pane.handle_tab_drop(&dragged_tab, 1, window, cx);
5444        });
5445
5446        // A should remain unpinned since it was dropped outside the pinned region
5447        assert_item_labels(&pane_a, [], cx);
5448        assert_item_labels(&pane_b, ["B!", "A*"], cx);
5449    }
5450
5451    #[gpui::test]
5452    async fn test_drag_pinned_tab_throughout_entire_range_of_pinned_tabs_both_directions(
5453        cx: &mut TestAppContext,
5454    ) {
5455        init_test(cx);
5456        let fs = FakeFs::new(cx.executor());
5457
5458        let project = Project::test(fs, None, cx).await;
5459        let (workspace, cx) =
5460            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
5461        let pane_a = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
5462
5463        // Add A, B, C and pin all
5464        let item_a = add_labeled_item(&pane_a, "A", false, cx);
5465        let item_b = add_labeled_item(&pane_a, "B", false, cx);
5466        let item_c = add_labeled_item(&pane_a, "C", false, cx);
5467        assert_item_labels(&pane_a, ["A", "B", "C*"], cx);
5468
5469        pane_a.update_in(cx, |pane, window, cx| {
5470            let ix = pane.index_for_item_id(item_a.item_id()).unwrap();
5471            pane.pin_tab_at(ix, window, cx);
5472
5473            let ix = pane.index_for_item_id(item_b.item_id()).unwrap();
5474            pane.pin_tab_at(ix, window, cx);
5475
5476            let ix = pane.index_for_item_id(item_c.item_id()).unwrap();
5477            pane.pin_tab_at(ix, window, cx);
5478        });
5479        assert_item_labels(&pane_a, ["A!", "B!", "C*!"], cx);
5480
5481        // Move A to right of B
5482        pane_a.update_in(cx, |pane, window, cx| {
5483            let dragged_tab = DraggedTab {
5484                pane: pane_a.clone(),
5485                item: item_a.boxed_clone(),
5486                ix: 0,
5487                detail: 0,
5488                is_active: true,
5489            };
5490            pane.handle_tab_drop(&dragged_tab, 1, window, cx);
5491        });
5492
5493        // A should be after B and all are pinned
5494        assert_item_labels(&pane_a, ["B!", "A*!", "C!"], cx);
5495
5496        // Move A to right of C
5497        pane_a.update_in(cx, |pane, window, cx| {
5498            let dragged_tab = DraggedTab {
5499                pane: pane_a.clone(),
5500                item: item_a.boxed_clone(),
5501                ix: 1,
5502                detail: 0,
5503                is_active: true,
5504            };
5505            pane.handle_tab_drop(&dragged_tab, 2, window, cx);
5506        });
5507
5508        // A should be after C and all are pinned
5509        assert_item_labels(&pane_a, ["B!", "C!", "A*!"], cx);
5510
5511        // Move A to left of C
5512        pane_a.update_in(cx, |pane, window, cx| {
5513            let dragged_tab = DraggedTab {
5514                pane: pane_a.clone(),
5515                item: item_a.boxed_clone(),
5516                ix: 2,
5517                detail: 0,
5518                is_active: true,
5519            };
5520            pane.handle_tab_drop(&dragged_tab, 1, window, cx);
5521        });
5522
5523        // A should be before C and all are pinned
5524        assert_item_labels(&pane_a, ["B!", "A*!", "C!"], cx);
5525
5526        // Move A to left of B
5527        pane_a.update_in(cx, |pane, window, cx| {
5528            let dragged_tab = DraggedTab {
5529                pane: pane_a.clone(),
5530                item: item_a.boxed_clone(),
5531                ix: 1,
5532                detail: 0,
5533                is_active: true,
5534            };
5535            pane.handle_tab_drop(&dragged_tab, 0, window, cx);
5536        });
5537
5538        // A should be before B and all are pinned
5539        assert_item_labels(&pane_a, ["A*!", "B!", "C!"], cx);
5540    }
5541
5542    #[gpui::test]
5543    async fn test_drag_first_tab_to_last_position(cx: &mut TestAppContext) {
5544        init_test(cx);
5545        let fs = FakeFs::new(cx.executor());
5546
5547        let project = Project::test(fs, None, cx).await;
5548        let (workspace, cx) =
5549            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
5550        let pane_a = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
5551
5552        // Add A, B, C
5553        let item_a = add_labeled_item(&pane_a, "A", false, cx);
5554        add_labeled_item(&pane_a, "B", false, cx);
5555        add_labeled_item(&pane_a, "C", false, cx);
5556        assert_item_labels(&pane_a, ["A", "B", "C*"], cx);
5557
5558        // Move A to the end
5559        pane_a.update_in(cx, |pane, window, cx| {
5560            let dragged_tab = DraggedTab {
5561                pane: pane_a.clone(),
5562                item: item_a.boxed_clone(),
5563                ix: 0,
5564                detail: 0,
5565                is_active: true,
5566            };
5567            pane.handle_tab_drop(&dragged_tab, 2, window, cx);
5568        });
5569
5570        // A should be at the end
5571        assert_item_labels(&pane_a, ["B", "C", "A*"], cx);
5572    }
5573
5574    #[gpui::test]
5575    async fn test_drag_last_tab_to_first_position(cx: &mut TestAppContext) {
5576        init_test(cx);
5577        let fs = FakeFs::new(cx.executor());
5578
5579        let project = Project::test(fs, None, cx).await;
5580        let (workspace, cx) =
5581            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
5582        let pane_a = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
5583
5584        // Add A, B, C
5585        add_labeled_item(&pane_a, "A", false, cx);
5586        add_labeled_item(&pane_a, "B", false, cx);
5587        let item_c = add_labeled_item(&pane_a, "C", false, cx);
5588        assert_item_labels(&pane_a, ["A", "B", "C*"], cx);
5589
5590        // Move C to the beginning
5591        pane_a.update_in(cx, |pane, window, cx| {
5592            let dragged_tab = DraggedTab {
5593                pane: pane_a.clone(),
5594                item: item_c.boxed_clone(),
5595                ix: 2,
5596                detail: 0,
5597                is_active: true,
5598            };
5599            pane.handle_tab_drop(&dragged_tab, 0, window, cx);
5600        });
5601
5602        // C should be at the beginning
5603        assert_item_labels(&pane_a, ["C*", "A", "B"], cx);
5604    }
5605
5606    #[gpui::test]
5607    async fn test_add_item_with_new_item(cx: &mut TestAppContext) {
5608        init_test(cx);
5609        let fs = FakeFs::new(cx.executor());
5610
5611        let project = Project::test(fs, None, cx).await;
5612        let (workspace, cx) =
5613            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
5614        let pane = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
5615
5616        // 1. Add with a destination index
5617        //   a. Add before the active item
5618        set_labeled_items(&pane, ["A", "B*", "C"], cx);
5619        pane.update_in(cx, |pane, window, cx| {
5620            pane.add_item(
5621                Box::new(cx.new(|cx| TestItem::new(cx).with_label("D"))),
5622                false,
5623                false,
5624                Some(0),
5625                window,
5626                cx,
5627            );
5628        });
5629        assert_item_labels(&pane, ["D*", "A", "B", "C"], cx);
5630
5631        //   b. Add after the active item
5632        set_labeled_items(&pane, ["A", "B*", "C"], cx);
5633        pane.update_in(cx, |pane, window, cx| {
5634            pane.add_item(
5635                Box::new(cx.new(|cx| TestItem::new(cx).with_label("D"))),
5636                false,
5637                false,
5638                Some(2),
5639                window,
5640                cx,
5641            );
5642        });
5643        assert_item_labels(&pane, ["A", "B", "D*", "C"], cx);
5644
5645        //   c. Add at the end of the item list (including off the length)
5646        set_labeled_items(&pane, ["A", "B*", "C"], cx);
5647        pane.update_in(cx, |pane, window, cx| {
5648            pane.add_item(
5649                Box::new(cx.new(|cx| TestItem::new(cx).with_label("D"))),
5650                false,
5651                false,
5652                Some(5),
5653                window,
5654                cx,
5655            );
5656        });
5657        assert_item_labels(&pane, ["A", "B", "C", "D*"], cx);
5658
5659        // 2. Add without a destination index
5660        //   a. Add with active item at the start of the item list
5661        set_labeled_items(&pane, ["A*", "B", "C"], cx);
5662        pane.update_in(cx, |pane, window, cx| {
5663            pane.add_item(
5664                Box::new(cx.new(|cx| TestItem::new(cx).with_label("D"))),
5665                false,
5666                false,
5667                None,
5668                window,
5669                cx,
5670            );
5671        });
5672        set_labeled_items(&pane, ["A", "D*", "B", "C"], cx);
5673
5674        //   b. Add with active item at the end of the item list
5675        set_labeled_items(&pane, ["A", "B", "C*"], cx);
5676        pane.update_in(cx, |pane, window, cx| {
5677            pane.add_item(
5678                Box::new(cx.new(|cx| TestItem::new(cx).with_label("D"))),
5679                false,
5680                false,
5681                None,
5682                window,
5683                cx,
5684            );
5685        });
5686        assert_item_labels(&pane, ["A", "B", "C", "D*"], cx);
5687    }
5688
5689    #[gpui::test]
5690    async fn test_add_item_with_existing_item(cx: &mut TestAppContext) {
5691        init_test(cx);
5692        let fs = FakeFs::new(cx.executor());
5693
5694        let project = Project::test(fs, None, cx).await;
5695        let (workspace, cx) =
5696            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
5697        let pane = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
5698
5699        // 1. Add with a destination index
5700        //   1a. Add before the active item
5701        let [_, _, _, d] = set_labeled_items(&pane, ["A", "B*", "C", "D"], cx);
5702        pane.update_in(cx, |pane, window, cx| {
5703            pane.add_item(d, false, false, Some(0), window, cx);
5704        });
5705        assert_item_labels(&pane, ["D*", "A", "B", "C"], cx);
5706
5707        //   1b. Add after the active item
5708        let [_, _, _, d] = set_labeled_items(&pane, ["A", "B*", "C", "D"], cx);
5709        pane.update_in(cx, |pane, window, cx| {
5710            pane.add_item(d, false, false, Some(2), window, cx);
5711        });
5712        assert_item_labels(&pane, ["A", "B", "D*", "C"], cx);
5713
5714        //   1c. Add at the end of the item list (including off the length)
5715        let [a, _, _, _] = set_labeled_items(&pane, ["A", "B*", "C", "D"], cx);
5716        pane.update_in(cx, |pane, window, cx| {
5717            pane.add_item(a, false, false, Some(5), window, cx);
5718        });
5719        assert_item_labels(&pane, ["B", "C", "D", "A*"], cx);
5720
5721        //   1d. Add same item to active index
5722        let [_, b, _] = set_labeled_items(&pane, ["A", "B*", "C"], cx);
5723        pane.update_in(cx, |pane, window, cx| {
5724            pane.add_item(b, false, false, Some(1), window, cx);
5725        });
5726        assert_item_labels(&pane, ["A", "B*", "C"], cx);
5727
5728        //   1e. Add item to index after same item in last position
5729        let [_, _, c] = set_labeled_items(&pane, ["A", "B*", "C"], cx);
5730        pane.update_in(cx, |pane, window, cx| {
5731            pane.add_item(c, false, false, Some(2), window, cx);
5732        });
5733        assert_item_labels(&pane, ["A", "B", "C*"], cx);
5734
5735        // 2. Add without a destination index
5736        //   2a. Add with active item at the start of the item list
5737        let [_, _, _, d] = set_labeled_items(&pane, ["A*", "B", "C", "D"], cx);
5738        pane.update_in(cx, |pane, window, cx| {
5739            pane.add_item(d, false, false, None, window, cx);
5740        });
5741        assert_item_labels(&pane, ["A", "D*", "B", "C"], cx);
5742
5743        //   2b. Add with active item at the end of the item list
5744        let [a, _, _, _] = set_labeled_items(&pane, ["A", "B", "C", "D*"], cx);
5745        pane.update_in(cx, |pane, window, cx| {
5746            pane.add_item(a, false, false, None, window, cx);
5747        });
5748        assert_item_labels(&pane, ["B", "C", "D", "A*"], cx);
5749
5750        //   2c. Add active item to active item at end of list
5751        let [_, _, c] = set_labeled_items(&pane, ["A", "B", "C*"], cx);
5752        pane.update_in(cx, |pane, window, cx| {
5753            pane.add_item(c, false, false, None, window, cx);
5754        });
5755        assert_item_labels(&pane, ["A", "B", "C*"], cx);
5756
5757        //   2d. Add active item to active item at start of list
5758        let [a, _, _] = set_labeled_items(&pane, ["A*", "B", "C"], cx);
5759        pane.update_in(cx, |pane, window, cx| {
5760            pane.add_item(a, false, false, None, window, cx);
5761        });
5762        assert_item_labels(&pane, ["A*", "B", "C"], cx);
5763    }
5764
5765    #[gpui::test]
5766    async fn test_add_item_with_same_project_entries(cx: &mut TestAppContext) {
5767        init_test(cx);
5768        let fs = FakeFs::new(cx.executor());
5769
5770        let project = Project::test(fs, None, cx).await;
5771        let (workspace, cx) =
5772            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
5773        let pane = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
5774
5775        // singleton view
5776        pane.update_in(cx, |pane, window, cx| {
5777            pane.add_item(
5778                Box::new(cx.new(|cx| {
5779                    TestItem::new(cx)
5780                        .with_buffer_kind(ItemBufferKind::Singleton)
5781                        .with_label("buffer 1")
5782                        .with_project_items(&[TestProjectItem::new(1, "one.txt", cx)])
5783                })),
5784                false,
5785                false,
5786                None,
5787                window,
5788                cx,
5789            );
5790        });
5791        assert_item_labels(&pane, ["buffer 1*"], cx);
5792
5793        // new singleton view with the same project entry
5794        pane.update_in(cx, |pane, window, cx| {
5795            pane.add_item(
5796                Box::new(cx.new(|cx| {
5797                    TestItem::new(cx)
5798                        .with_buffer_kind(ItemBufferKind::Singleton)
5799                        .with_label("buffer 1")
5800                        .with_project_items(&[TestProjectItem::new(1, "1.txt", cx)])
5801                })),
5802                false,
5803                false,
5804                None,
5805                window,
5806                cx,
5807            );
5808        });
5809        assert_item_labels(&pane, ["buffer 1*"], cx);
5810
5811        // new singleton view with different project entry
5812        pane.update_in(cx, |pane, window, cx| {
5813            pane.add_item(
5814                Box::new(cx.new(|cx| {
5815                    TestItem::new(cx)
5816                        .with_buffer_kind(ItemBufferKind::Singleton)
5817                        .with_label("buffer 2")
5818                        .with_project_items(&[TestProjectItem::new(2, "2.txt", cx)])
5819                })),
5820                false,
5821                false,
5822                None,
5823                window,
5824                cx,
5825            );
5826        });
5827        assert_item_labels(&pane, ["buffer 1", "buffer 2*"], cx);
5828
5829        // new multibuffer view with the same project entry
5830        pane.update_in(cx, |pane, window, cx| {
5831            pane.add_item(
5832                Box::new(cx.new(|cx| {
5833                    TestItem::new(cx)
5834                        .with_buffer_kind(ItemBufferKind::Multibuffer)
5835                        .with_label("multibuffer 1")
5836                        .with_project_items(&[TestProjectItem::new(1, "1.txt", cx)])
5837                })),
5838                false,
5839                false,
5840                None,
5841                window,
5842                cx,
5843            );
5844        });
5845        assert_item_labels(&pane, ["buffer 1", "buffer 2", "multibuffer 1*"], cx);
5846
5847        // another multibuffer view with the same project entry
5848        pane.update_in(cx, |pane, window, cx| {
5849            pane.add_item(
5850                Box::new(cx.new(|cx| {
5851                    TestItem::new(cx)
5852                        .with_buffer_kind(ItemBufferKind::Multibuffer)
5853                        .with_label("multibuffer 1b")
5854                        .with_project_items(&[TestProjectItem::new(1, "1.txt", cx)])
5855                })),
5856                false,
5857                false,
5858                None,
5859                window,
5860                cx,
5861            );
5862        });
5863        assert_item_labels(
5864            &pane,
5865            ["buffer 1", "buffer 2", "multibuffer 1", "multibuffer 1b*"],
5866            cx,
5867        );
5868    }
5869
5870    #[gpui::test]
5871    async fn test_remove_item_ordering_history(cx: &mut TestAppContext) {
5872        init_test(cx);
5873        let fs = FakeFs::new(cx.executor());
5874
5875        let project = Project::test(fs, None, cx).await;
5876        let (workspace, cx) =
5877            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
5878        let pane = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
5879
5880        add_labeled_item(&pane, "A", false, cx);
5881        add_labeled_item(&pane, "B", false, cx);
5882        add_labeled_item(&pane, "C", false, cx);
5883        add_labeled_item(&pane, "D", false, cx);
5884        assert_item_labels(&pane, ["A", "B", "C", "D*"], cx);
5885
5886        pane.update_in(cx, |pane, window, cx| {
5887            pane.activate_item(1, false, false, window, cx)
5888        });
5889        add_labeled_item(&pane, "1", false, cx);
5890        assert_item_labels(&pane, ["A", "B", "1*", "C", "D"], cx);
5891
5892        pane.update_in(cx, |pane, window, cx| {
5893            pane.close_active_item(
5894                &CloseActiveItem {
5895                    save_intent: None,
5896                    close_pinned: false,
5897                },
5898                window,
5899                cx,
5900            )
5901        })
5902        .await
5903        .unwrap();
5904        assert_item_labels(&pane, ["A", "B*", "C", "D"], cx);
5905
5906        pane.update_in(cx, |pane, window, cx| {
5907            pane.activate_item(3, false, false, window, cx)
5908        });
5909        assert_item_labels(&pane, ["A", "B", "C", "D*"], cx);
5910
5911        pane.update_in(cx, |pane, window, cx| {
5912            pane.close_active_item(
5913                &CloseActiveItem {
5914                    save_intent: None,
5915                    close_pinned: false,
5916                },
5917                window,
5918                cx,
5919            )
5920        })
5921        .await
5922        .unwrap();
5923        assert_item_labels(&pane, ["A", "B*", "C"], cx);
5924
5925        pane.update_in(cx, |pane, window, cx| {
5926            pane.close_active_item(
5927                &CloseActiveItem {
5928                    save_intent: None,
5929                    close_pinned: false,
5930                },
5931                window,
5932                cx,
5933            )
5934        })
5935        .await
5936        .unwrap();
5937        assert_item_labels(&pane, ["A", "C*"], cx);
5938
5939        pane.update_in(cx, |pane, window, cx| {
5940            pane.close_active_item(
5941                &CloseActiveItem {
5942                    save_intent: None,
5943                    close_pinned: false,
5944                },
5945                window,
5946                cx,
5947            )
5948        })
5949        .await
5950        .unwrap();
5951        assert_item_labels(&pane, ["A*"], cx);
5952    }
5953
5954    #[gpui::test]
5955    async fn test_remove_item_ordering_neighbour(cx: &mut TestAppContext) {
5956        init_test(cx);
5957        cx.update_global::<SettingsStore, ()>(|s, cx| {
5958            s.update_user_settings(cx, |s| {
5959                s.tabs.get_or_insert_default().activate_on_close = Some(ActivateOnClose::Neighbour);
5960            });
5961        });
5962        let fs = FakeFs::new(cx.executor());
5963
5964        let project = Project::test(fs, None, cx).await;
5965        let (workspace, cx) =
5966            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
5967        let pane = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
5968
5969        add_labeled_item(&pane, "A", false, cx);
5970        add_labeled_item(&pane, "B", false, cx);
5971        add_labeled_item(&pane, "C", false, cx);
5972        add_labeled_item(&pane, "D", false, cx);
5973        assert_item_labels(&pane, ["A", "B", "C", "D*"], cx);
5974
5975        pane.update_in(cx, |pane, window, cx| {
5976            pane.activate_item(1, false, false, window, cx)
5977        });
5978        add_labeled_item(&pane, "1", false, cx);
5979        assert_item_labels(&pane, ["A", "B", "1*", "C", "D"], cx);
5980
5981        pane.update_in(cx, |pane, window, cx| {
5982            pane.close_active_item(
5983                &CloseActiveItem {
5984                    save_intent: None,
5985                    close_pinned: false,
5986                },
5987                window,
5988                cx,
5989            )
5990        })
5991        .await
5992        .unwrap();
5993        assert_item_labels(&pane, ["A", "B", "C*", "D"], cx);
5994
5995        pane.update_in(cx, |pane, window, cx| {
5996            pane.activate_item(3, false, false, window, cx)
5997        });
5998        assert_item_labels(&pane, ["A", "B", "C", "D*"], cx);
5999
6000        pane.update_in(cx, |pane, window, cx| {
6001            pane.close_active_item(
6002                &CloseActiveItem {
6003                    save_intent: None,
6004                    close_pinned: false,
6005                },
6006                window,
6007                cx,
6008            )
6009        })
6010        .await
6011        .unwrap();
6012        assert_item_labels(&pane, ["A", "B", "C*"], cx);
6013
6014        pane.update_in(cx, |pane, window, cx| {
6015            pane.close_active_item(
6016                &CloseActiveItem {
6017                    save_intent: None,
6018                    close_pinned: false,
6019                },
6020                window,
6021                cx,
6022            )
6023        })
6024        .await
6025        .unwrap();
6026        assert_item_labels(&pane, ["A", "B*"], cx);
6027
6028        pane.update_in(cx, |pane, window, cx| {
6029            pane.close_active_item(
6030                &CloseActiveItem {
6031                    save_intent: None,
6032                    close_pinned: false,
6033                },
6034                window,
6035                cx,
6036            )
6037        })
6038        .await
6039        .unwrap();
6040        assert_item_labels(&pane, ["A*"], cx);
6041    }
6042
6043    #[gpui::test]
6044    async fn test_remove_item_ordering_left_neighbour(cx: &mut TestAppContext) {
6045        init_test(cx);
6046        cx.update_global::<SettingsStore, ()>(|s, cx| {
6047            s.update_user_settings(cx, |s| {
6048                s.tabs.get_or_insert_default().activate_on_close =
6049                    Some(ActivateOnClose::LeftNeighbour);
6050            });
6051        });
6052        let fs = FakeFs::new(cx.executor());
6053
6054        let project = Project::test(fs, None, cx).await;
6055        let (workspace, cx) =
6056            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
6057        let pane = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
6058
6059        add_labeled_item(&pane, "A", false, cx);
6060        add_labeled_item(&pane, "B", false, cx);
6061        add_labeled_item(&pane, "C", false, cx);
6062        add_labeled_item(&pane, "D", false, cx);
6063        assert_item_labels(&pane, ["A", "B", "C", "D*"], cx);
6064
6065        pane.update_in(cx, |pane, window, cx| {
6066            pane.activate_item(1, false, false, window, cx)
6067        });
6068        add_labeled_item(&pane, "1", false, cx);
6069        assert_item_labels(&pane, ["A", "B", "1*", "C", "D"], cx);
6070
6071        pane.update_in(cx, |pane, window, cx| {
6072            pane.close_active_item(
6073                &CloseActiveItem {
6074                    save_intent: None,
6075                    close_pinned: false,
6076                },
6077                window,
6078                cx,
6079            )
6080        })
6081        .await
6082        .unwrap();
6083        assert_item_labels(&pane, ["A", "B*", "C", "D"], cx);
6084
6085        pane.update_in(cx, |pane, window, cx| {
6086            pane.activate_item(3, false, false, window, cx)
6087        });
6088        assert_item_labels(&pane, ["A", "B", "C", "D*"], cx);
6089
6090        pane.update_in(cx, |pane, window, cx| {
6091            pane.close_active_item(
6092                &CloseActiveItem {
6093                    save_intent: None,
6094                    close_pinned: false,
6095                },
6096                window,
6097                cx,
6098            )
6099        })
6100        .await
6101        .unwrap();
6102        assert_item_labels(&pane, ["A", "B", "C*"], cx);
6103
6104        pane.update_in(cx, |pane, window, cx| {
6105            pane.activate_item(0, false, false, window, cx)
6106        });
6107        assert_item_labels(&pane, ["A*", "B", "C"], cx);
6108
6109        pane.update_in(cx, |pane, window, cx| {
6110            pane.close_active_item(
6111                &CloseActiveItem {
6112                    save_intent: None,
6113                    close_pinned: false,
6114                },
6115                window,
6116                cx,
6117            )
6118        })
6119        .await
6120        .unwrap();
6121        assert_item_labels(&pane, ["B*", "C"], cx);
6122
6123        pane.update_in(cx, |pane, window, cx| {
6124            pane.close_active_item(
6125                &CloseActiveItem {
6126                    save_intent: None,
6127                    close_pinned: false,
6128                },
6129                window,
6130                cx,
6131            )
6132        })
6133        .await
6134        .unwrap();
6135        assert_item_labels(&pane, ["C*"], cx);
6136    }
6137
6138    #[gpui::test]
6139    async fn test_close_inactive_items(cx: &mut TestAppContext) {
6140        init_test(cx);
6141        let fs = FakeFs::new(cx.executor());
6142
6143        let project = Project::test(fs, None, cx).await;
6144        let (workspace, cx) =
6145            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
6146        let pane = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
6147
6148        let item_a = add_labeled_item(&pane, "A", false, cx);
6149        pane.update_in(cx, |pane, window, cx| {
6150            let ix = pane.index_for_item_id(item_a.item_id()).unwrap();
6151            pane.pin_tab_at(ix, window, cx);
6152        });
6153        assert_item_labels(&pane, ["A*!"], cx);
6154
6155        let item_b = add_labeled_item(&pane, "B", false, cx);
6156        pane.update_in(cx, |pane, window, cx| {
6157            let ix = pane.index_for_item_id(item_b.item_id()).unwrap();
6158            pane.pin_tab_at(ix, window, cx);
6159        });
6160        assert_item_labels(&pane, ["A!", "B*!"], cx);
6161
6162        add_labeled_item(&pane, "C", false, cx);
6163        assert_item_labels(&pane, ["A!", "B!", "C*"], cx);
6164
6165        add_labeled_item(&pane, "D", false, cx);
6166        add_labeled_item(&pane, "E", false, cx);
6167        assert_item_labels(&pane, ["A!", "B!", "C", "D", "E*"], cx);
6168
6169        pane.update_in(cx, |pane, window, cx| {
6170            pane.close_other_items(
6171                &CloseOtherItems {
6172                    save_intent: None,
6173                    close_pinned: false,
6174                },
6175                None,
6176                window,
6177                cx,
6178            )
6179        })
6180        .await
6181        .unwrap();
6182        assert_item_labels(&pane, ["A!", "B!", "E*"], cx);
6183    }
6184
6185    #[gpui::test]
6186    async fn test_running_close_inactive_items_via_an_inactive_item(cx: &mut TestAppContext) {
6187        init_test(cx);
6188        let fs = FakeFs::new(cx.executor());
6189
6190        let project = Project::test(fs, None, cx).await;
6191        let (workspace, cx) =
6192            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
6193        let pane = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
6194
6195        add_labeled_item(&pane, "A", false, cx);
6196        assert_item_labels(&pane, ["A*"], cx);
6197
6198        let item_b = add_labeled_item(&pane, "B", false, cx);
6199        assert_item_labels(&pane, ["A", "B*"], cx);
6200
6201        add_labeled_item(&pane, "C", false, cx);
6202        add_labeled_item(&pane, "D", false, cx);
6203        add_labeled_item(&pane, "E", false, cx);
6204        assert_item_labels(&pane, ["A", "B", "C", "D", "E*"], cx);
6205
6206        pane.update_in(cx, |pane, window, cx| {
6207            pane.close_other_items(
6208                &CloseOtherItems {
6209                    save_intent: None,
6210                    close_pinned: false,
6211                },
6212                Some(item_b.item_id()),
6213                window,
6214                cx,
6215            )
6216        })
6217        .await
6218        .unwrap();
6219        assert_item_labels(&pane, ["B*"], cx);
6220    }
6221
6222    #[gpui::test]
6223    async fn test_close_clean_items(cx: &mut TestAppContext) {
6224        init_test(cx);
6225        let fs = FakeFs::new(cx.executor());
6226
6227        let project = Project::test(fs, None, cx).await;
6228        let (workspace, cx) =
6229            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
6230        let pane = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
6231
6232        add_labeled_item(&pane, "A", true, cx);
6233        add_labeled_item(&pane, "B", false, cx);
6234        add_labeled_item(&pane, "C", true, cx);
6235        add_labeled_item(&pane, "D", false, cx);
6236        add_labeled_item(&pane, "E", false, cx);
6237        assert_item_labels(&pane, ["A^", "B", "C^", "D", "E*"], cx);
6238
6239        pane.update_in(cx, |pane, window, cx| {
6240            pane.close_clean_items(
6241                &CloseCleanItems {
6242                    close_pinned: false,
6243                },
6244                window,
6245                cx,
6246            )
6247        })
6248        .await
6249        .unwrap();
6250        assert_item_labels(&pane, ["A^", "C*^"], cx);
6251    }
6252
6253    #[gpui::test]
6254    async fn test_close_items_to_the_left(cx: &mut TestAppContext) {
6255        init_test(cx);
6256        let fs = FakeFs::new(cx.executor());
6257
6258        let project = Project::test(fs, None, cx).await;
6259        let (workspace, cx) =
6260            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
6261        let pane = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
6262
6263        set_labeled_items(&pane, ["A", "B", "C*", "D", "E"], cx);
6264
6265        pane.update_in(cx, |pane, window, cx| {
6266            pane.close_items_to_the_left_by_id(
6267                None,
6268                &CloseItemsToTheLeft {
6269                    close_pinned: false,
6270                },
6271                window,
6272                cx,
6273            )
6274        })
6275        .await
6276        .unwrap();
6277        assert_item_labels(&pane, ["C*", "D", "E"], cx);
6278    }
6279
6280    #[gpui::test]
6281    async fn test_close_items_to_the_right(cx: &mut TestAppContext) {
6282        init_test(cx);
6283        let fs = FakeFs::new(cx.executor());
6284
6285        let project = Project::test(fs, None, cx).await;
6286        let (workspace, cx) =
6287            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
6288        let pane = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
6289
6290        set_labeled_items(&pane, ["A", "B", "C*", "D", "E"], cx);
6291
6292        pane.update_in(cx, |pane, window, cx| {
6293            pane.close_items_to_the_right_by_id(
6294                None,
6295                &CloseItemsToTheRight {
6296                    close_pinned: false,
6297                },
6298                window,
6299                cx,
6300            )
6301        })
6302        .await
6303        .unwrap();
6304        assert_item_labels(&pane, ["A", "B", "C*"], cx);
6305    }
6306
6307    #[gpui::test]
6308    async fn test_close_all_items(cx: &mut TestAppContext) {
6309        init_test(cx);
6310        let fs = FakeFs::new(cx.executor());
6311
6312        let project = Project::test(fs, None, cx).await;
6313        let (workspace, cx) =
6314            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
6315        let pane = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
6316
6317        let item_a = add_labeled_item(&pane, "A", false, cx);
6318        add_labeled_item(&pane, "B", false, cx);
6319        add_labeled_item(&pane, "C", false, cx);
6320        assert_item_labels(&pane, ["A", "B", "C*"], cx);
6321
6322        pane.update_in(cx, |pane, window, cx| {
6323            let ix = pane.index_for_item_id(item_a.item_id()).unwrap();
6324            pane.pin_tab_at(ix, window, cx);
6325            pane.close_all_items(
6326                &CloseAllItems {
6327                    save_intent: None,
6328                    close_pinned: false,
6329                },
6330                window,
6331                cx,
6332            )
6333        })
6334        .await
6335        .unwrap();
6336        assert_item_labels(&pane, ["A*!"], cx);
6337
6338        pane.update_in(cx, |pane, window, cx| {
6339            let ix = pane.index_for_item_id(item_a.item_id()).unwrap();
6340            pane.unpin_tab_at(ix, window, cx);
6341            pane.close_all_items(
6342                &CloseAllItems {
6343                    save_intent: None,
6344                    close_pinned: false,
6345                },
6346                window,
6347                cx,
6348            )
6349        })
6350        .await
6351        .unwrap();
6352
6353        assert_item_labels(&pane, [], cx);
6354
6355        add_labeled_item(&pane, "A", true, cx).update(cx, |item, cx| {
6356            item.project_items
6357                .push(TestProjectItem::new_dirty(1, "A.txt", cx))
6358        });
6359        add_labeled_item(&pane, "B", true, cx).update(cx, |item, cx| {
6360            item.project_items
6361                .push(TestProjectItem::new_dirty(2, "B.txt", cx))
6362        });
6363        add_labeled_item(&pane, "C", true, cx).update(cx, |item, cx| {
6364            item.project_items
6365                .push(TestProjectItem::new_dirty(3, "C.txt", cx))
6366        });
6367        assert_item_labels(&pane, ["A^", "B^", "C*^"], cx);
6368
6369        let save = pane.update_in(cx, |pane, window, cx| {
6370            pane.close_all_items(
6371                &CloseAllItems {
6372                    save_intent: None,
6373                    close_pinned: false,
6374                },
6375                window,
6376                cx,
6377            )
6378        });
6379
6380        cx.executor().run_until_parked();
6381        cx.simulate_prompt_answer("Save all");
6382        save.await.unwrap();
6383        assert_item_labels(&pane, [], cx);
6384
6385        add_labeled_item(&pane, "A", true, cx);
6386        add_labeled_item(&pane, "B", true, cx);
6387        add_labeled_item(&pane, "C", true, cx);
6388        assert_item_labels(&pane, ["A^", "B^", "C*^"], cx);
6389        let save = pane.update_in(cx, |pane, window, cx| {
6390            pane.close_all_items(
6391                &CloseAllItems {
6392                    save_intent: None,
6393                    close_pinned: false,
6394                },
6395                window,
6396                cx,
6397            )
6398        });
6399
6400        cx.executor().run_until_parked();
6401        cx.simulate_prompt_answer("Discard all");
6402        save.await.unwrap();
6403        assert_item_labels(&pane, [], cx);
6404    }
6405
6406    #[gpui::test]
6407    async fn test_close_multibuffer_items(cx: &mut TestAppContext) {
6408        init_test(cx);
6409        let fs = FakeFs::new(cx.executor());
6410
6411        let project = Project::test(fs, None, cx).await;
6412        let (workspace, cx) =
6413            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
6414        let pane = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
6415
6416        let add_labeled_item = |pane: &Entity<Pane>,
6417                                label,
6418                                is_dirty,
6419                                kind: ItemBufferKind,
6420                                cx: &mut VisualTestContext| {
6421            pane.update_in(cx, |pane, window, cx| {
6422                let labeled_item = Box::new(cx.new(|cx| {
6423                    TestItem::new(cx)
6424                        .with_label(label)
6425                        .with_dirty(is_dirty)
6426                        .with_buffer_kind(kind)
6427                }));
6428                pane.add_item(labeled_item.clone(), false, false, None, window, cx);
6429                labeled_item
6430            })
6431        };
6432
6433        let item_a = add_labeled_item(&pane, "A", false, ItemBufferKind::Multibuffer, cx);
6434        add_labeled_item(&pane, "B", false, ItemBufferKind::Multibuffer, cx);
6435        add_labeled_item(&pane, "C", false, ItemBufferKind::Singleton, cx);
6436        assert_item_labels(&pane, ["A", "B", "C*"], cx);
6437
6438        pane.update_in(cx, |pane, window, cx| {
6439            let ix = pane.index_for_item_id(item_a.item_id()).unwrap();
6440            pane.pin_tab_at(ix, window, cx);
6441            pane.close_multibuffer_items(
6442                &CloseMultibufferItems {
6443                    save_intent: None,
6444                    close_pinned: false,
6445                },
6446                window,
6447                cx,
6448            )
6449        })
6450        .await
6451        .unwrap();
6452        assert_item_labels(&pane, ["A!", "C*"], cx);
6453
6454        pane.update_in(cx, |pane, window, cx| {
6455            let ix = pane.index_for_item_id(item_a.item_id()).unwrap();
6456            pane.unpin_tab_at(ix, window, cx);
6457            pane.close_multibuffer_items(
6458                &CloseMultibufferItems {
6459                    save_intent: None,
6460                    close_pinned: false,
6461                },
6462                window,
6463                cx,
6464            )
6465        })
6466        .await
6467        .unwrap();
6468
6469        assert_item_labels(&pane, ["C*"], cx);
6470
6471        add_labeled_item(&pane, "A", true, ItemBufferKind::Singleton, cx).update(cx, |item, cx| {
6472            item.project_items
6473                .push(TestProjectItem::new_dirty(1, "A.txt", cx))
6474        });
6475        add_labeled_item(&pane, "B", true, ItemBufferKind::Multibuffer, cx).update(
6476            cx,
6477            |item, cx| {
6478                item.project_items
6479                    .push(TestProjectItem::new_dirty(2, "B.txt", cx))
6480            },
6481        );
6482        add_labeled_item(&pane, "D", true, ItemBufferKind::Multibuffer, cx).update(
6483            cx,
6484            |item, cx| {
6485                item.project_items
6486                    .push(TestProjectItem::new_dirty(3, "D.txt", cx))
6487            },
6488        );
6489        assert_item_labels(&pane, ["C", "A^", "B^", "D*^"], cx);
6490
6491        let save = pane.update_in(cx, |pane, window, cx| {
6492            pane.close_multibuffer_items(
6493                &CloseMultibufferItems {
6494                    save_intent: None,
6495                    close_pinned: false,
6496                },
6497                window,
6498                cx,
6499            )
6500        });
6501
6502        cx.executor().run_until_parked();
6503        cx.simulate_prompt_answer("Save all");
6504        save.await.unwrap();
6505        assert_item_labels(&pane, ["C", "A*^"], cx);
6506
6507        add_labeled_item(&pane, "B", true, ItemBufferKind::Multibuffer, cx).update(
6508            cx,
6509            |item, cx| {
6510                item.project_items
6511                    .push(TestProjectItem::new_dirty(2, "B.txt", cx))
6512            },
6513        );
6514        add_labeled_item(&pane, "D", true, ItemBufferKind::Multibuffer, cx).update(
6515            cx,
6516            |item, cx| {
6517                item.project_items
6518                    .push(TestProjectItem::new_dirty(3, "D.txt", cx))
6519            },
6520        );
6521        assert_item_labels(&pane, ["C", "A^", "B^", "D*^"], cx);
6522        let save = pane.update_in(cx, |pane, window, cx| {
6523            pane.close_multibuffer_items(
6524                &CloseMultibufferItems {
6525                    save_intent: None,
6526                    close_pinned: false,
6527                },
6528                window,
6529                cx,
6530            )
6531        });
6532
6533        cx.executor().run_until_parked();
6534        cx.simulate_prompt_answer("Discard all");
6535        save.await.unwrap();
6536        assert_item_labels(&pane, ["C", "A*^"], cx);
6537    }
6538
6539    #[gpui::test]
6540    async fn test_close_with_save_intent(cx: &mut TestAppContext) {
6541        init_test(cx);
6542        let fs = FakeFs::new(cx.executor());
6543
6544        let project = Project::test(fs, None, cx).await;
6545        let (workspace, cx) =
6546            cx.add_window_view(|window, cx| Workspace::test_new(project, window, cx));
6547        let pane = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
6548
6549        let a = cx.update(|_, cx| TestProjectItem::new_dirty(1, "A.txt", cx));
6550        let b = cx.update(|_, cx| TestProjectItem::new_dirty(1, "B.txt", cx));
6551        let c = cx.update(|_, cx| TestProjectItem::new_dirty(1, "C.txt", cx));
6552
6553        add_labeled_item(&pane, "AB", true, cx).update(cx, |item, _| {
6554            item.project_items.push(a.clone());
6555            item.project_items.push(b.clone());
6556        });
6557        add_labeled_item(&pane, "C", true, cx)
6558            .update(cx, |item, _| item.project_items.push(c.clone()));
6559        assert_item_labels(&pane, ["AB^", "C*^"], cx);
6560
6561        pane.update_in(cx, |pane, window, cx| {
6562            pane.close_all_items(
6563                &CloseAllItems {
6564                    save_intent: Some(SaveIntent::Save),
6565                    close_pinned: false,
6566                },
6567                window,
6568                cx,
6569            )
6570        })
6571        .await
6572        .unwrap();
6573
6574        assert_item_labels(&pane, [], cx);
6575        cx.update(|_, cx| {
6576            assert!(!a.read(cx).is_dirty);
6577            assert!(!b.read(cx).is_dirty);
6578            assert!(!c.read(cx).is_dirty);
6579        });
6580    }
6581
6582    #[gpui::test]
6583    async fn test_new_tab_scrolls_into_view_completely(cx: &mut TestAppContext) {
6584        // Arrange
6585        init_test(cx);
6586        let fs = FakeFs::new(cx.executor());
6587
6588        let project = Project::test(fs, None, cx).await;
6589        let (workspace, cx) =
6590            cx.add_window_view(|window, cx| Workspace::test_new(project, window, cx));
6591        let pane = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
6592
6593        cx.simulate_resize(size(px(300.), px(300.)));
6594
6595        add_labeled_item(&pane, "untitled", false, cx);
6596        add_labeled_item(&pane, "untitled", false, cx);
6597        add_labeled_item(&pane, "untitled", false, cx);
6598        add_labeled_item(&pane, "untitled", false, cx);
6599        // Act: this should trigger a scroll
6600        add_labeled_item(&pane, "untitled", false, cx);
6601        // Assert
6602        let tab_bar_scroll_handle =
6603            pane.update_in(cx, |pane, _window, _cx| pane.tab_bar_scroll_handle.clone());
6604        assert_eq!(tab_bar_scroll_handle.children_count(), 6);
6605        let tab_bounds = cx.debug_bounds("TAB-3").unwrap();
6606        let new_tab_button_bounds = cx.debug_bounds("ICON-Plus").unwrap();
6607        let scroll_bounds = tab_bar_scroll_handle.bounds();
6608        let scroll_offset = tab_bar_scroll_handle.offset();
6609        assert!(tab_bounds.right() <= scroll_bounds.right() + scroll_offset.x);
6610        // -39.5 is the magic number for this setup
6611        assert_eq!(scroll_offset.x, px(-39.5));
6612        assert!(
6613            !tab_bounds.intersects(&new_tab_button_bounds),
6614            "Tab should not overlap with the new tab button, if this is failing check if there's been a redesign!"
6615        );
6616    }
6617
6618    #[gpui::test]
6619    async fn test_close_all_items_including_pinned(cx: &mut TestAppContext) {
6620        init_test(cx);
6621        let fs = FakeFs::new(cx.executor());
6622
6623        let project = Project::test(fs, None, cx).await;
6624        let (workspace, cx) =
6625            cx.add_window_view(|window, cx| Workspace::test_new(project, window, cx));
6626        let pane = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
6627
6628        let item_a = add_labeled_item(&pane, "A", false, cx);
6629        add_labeled_item(&pane, "B", false, cx);
6630        add_labeled_item(&pane, "C", false, cx);
6631        assert_item_labels(&pane, ["A", "B", "C*"], cx);
6632
6633        pane.update_in(cx, |pane, window, cx| {
6634            let ix = pane.index_for_item_id(item_a.item_id()).unwrap();
6635            pane.pin_tab_at(ix, window, cx);
6636            pane.close_all_items(
6637                &CloseAllItems {
6638                    save_intent: None,
6639                    close_pinned: true,
6640                },
6641                window,
6642                cx,
6643            )
6644        })
6645        .await
6646        .unwrap();
6647        assert_item_labels(&pane, [], cx);
6648    }
6649
6650    #[gpui::test]
6651    async fn test_close_pinned_tab_with_non_pinned_in_same_pane(cx: &mut TestAppContext) {
6652        init_test(cx);
6653        let fs = FakeFs::new(cx.executor());
6654        let project = Project::test(fs, None, cx).await;
6655        let (workspace, cx) =
6656            cx.add_window_view(|window, cx| Workspace::test_new(project, window, cx));
6657
6658        // Non-pinned tabs in same pane
6659        let pane = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
6660        add_labeled_item(&pane, "A", false, cx);
6661        add_labeled_item(&pane, "B", false, cx);
6662        add_labeled_item(&pane, "C", false, cx);
6663        pane.update_in(cx, |pane, window, cx| {
6664            pane.pin_tab_at(0, window, cx);
6665        });
6666        set_labeled_items(&pane, ["A*", "B", "C"], cx);
6667        pane.update_in(cx, |pane, window, cx| {
6668            pane.close_active_item(
6669                &CloseActiveItem {
6670                    save_intent: None,
6671                    close_pinned: false,
6672                },
6673                window,
6674                cx,
6675            )
6676            .unwrap();
6677        });
6678        // Non-pinned tab should be active
6679        assert_item_labels(&pane, ["A!", "B*", "C"], cx);
6680    }
6681
6682    #[gpui::test]
6683    async fn test_close_pinned_tab_with_non_pinned_in_different_pane(cx: &mut TestAppContext) {
6684        init_test(cx);
6685        let fs = FakeFs::new(cx.executor());
6686        let project = Project::test(fs, None, cx).await;
6687        let (workspace, cx) =
6688            cx.add_window_view(|window, cx| Workspace::test_new(project, window, cx));
6689
6690        // No non-pinned tabs in same pane, non-pinned tabs in another pane
6691        let pane1 = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
6692        let pane2 = workspace.update_in(cx, |workspace, window, cx| {
6693            workspace.split_pane(pane1.clone(), SplitDirection::Right, window, cx)
6694        });
6695        add_labeled_item(&pane1, "A", false, cx);
6696        pane1.update_in(cx, |pane, window, cx| {
6697            pane.pin_tab_at(0, window, cx);
6698        });
6699        set_labeled_items(&pane1, ["A*"], cx);
6700        add_labeled_item(&pane2, "B", false, cx);
6701        set_labeled_items(&pane2, ["B"], cx);
6702        pane1.update_in(cx, |pane, window, cx| {
6703            pane.close_active_item(
6704                &CloseActiveItem {
6705                    save_intent: None,
6706                    close_pinned: false,
6707                },
6708                window,
6709                cx,
6710            )
6711            .unwrap();
6712        });
6713        //  Non-pinned tab of other pane should be active
6714        assert_item_labels(&pane2, ["B*"], cx);
6715    }
6716
6717    #[gpui::test]
6718    async fn ensure_item_closing_actions_do_not_panic_when_no_items_exist(cx: &mut TestAppContext) {
6719        init_test(cx);
6720        let fs = FakeFs::new(cx.executor());
6721        let project = Project::test(fs, None, cx).await;
6722        let (workspace, cx) =
6723            cx.add_window_view(|window, cx| Workspace::test_new(project, window, cx));
6724
6725        let pane = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
6726        assert_item_labels(&pane, [], cx);
6727
6728        pane.update_in(cx, |pane, window, cx| {
6729            pane.close_active_item(
6730                &CloseActiveItem {
6731                    save_intent: None,
6732                    close_pinned: false,
6733                },
6734                window,
6735                cx,
6736            )
6737        })
6738        .await
6739        .unwrap();
6740
6741        pane.update_in(cx, |pane, window, cx| {
6742            pane.close_other_items(
6743                &CloseOtherItems {
6744                    save_intent: None,
6745                    close_pinned: false,
6746                },
6747                None,
6748                window,
6749                cx,
6750            )
6751        })
6752        .await
6753        .unwrap();
6754
6755        pane.update_in(cx, |pane, window, cx| {
6756            pane.close_all_items(
6757                &CloseAllItems {
6758                    save_intent: None,
6759                    close_pinned: false,
6760                },
6761                window,
6762                cx,
6763            )
6764        })
6765        .await
6766        .unwrap();
6767
6768        pane.update_in(cx, |pane, window, cx| {
6769            pane.close_clean_items(
6770                &CloseCleanItems {
6771                    close_pinned: false,
6772                },
6773                window,
6774                cx,
6775            )
6776        })
6777        .await
6778        .unwrap();
6779
6780        pane.update_in(cx, |pane, window, cx| {
6781            pane.close_items_to_the_right_by_id(
6782                None,
6783                &CloseItemsToTheRight {
6784                    close_pinned: false,
6785                },
6786                window,
6787                cx,
6788            )
6789        })
6790        .await
6791        .unwrap();
6792
6793        pane.update_in(cx, |pane, window, cx| {
6794            pane.close_items_to_the_left_by_id(
6795                None,
6796                &CloseItemsToTheLeft {
6797                    close_pinned: false,
6798                },
6799                window,
6800                cx,
6801            )
6802        })
6803        .await
6804        .unwrap();
6805    }
6806
6807    #[gpui::test]
6808    async fn test_item_swapping_actions(cx: &mut TestAppContext) {
6809        init_test(cx);
6810        let fs = FakeFs::new(cx.executor());
6811        let project = Project::test(fs, None, cx).await;
6812        let (workspace, cx) =
6813            cx.add_window_view(|window, cx| Workspace::test_new(project, window, cx));
6814
6815        let pane = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
6816        assert_item_labels(&pane, [], cx);
6817
6818        // Test that these actions do not panic
6819        pane.update_in(cx, |pane, window, cx| {
6820            pane.swap_item_right(&Default::default(), window, cx);
6821        });
6822
6823        pane.update_in(cx, |pane, window, cx| {
6824            pane.swap_item_left(&Default::default(), window, cx);
6825        });
6826
6827        add_labeled_item(&pane, "A", false, cx);
6828        add_labeled_item(&pane, "B", false, cx);
6829        add_labeled_item(&pane, "C", false, cx);
6830        assert_item_labels(&pane, ["A", "B", "C*"], cx);
6831
6832        pane.update_in(cx, |pane, window, cx| {
6833            pane.swap_item_right(&Default::default(), window, cx);
6834        });
6835        assert_item_labels(&pane, ["A", "B", "C*"], cx);
6836
6837        pane.update_in(cx, |pane, window, cx| {
6838            pane.swap_item_left(&Default::default(), window, cx);
6839        });
6840        assert_item_labels(&pane, ["A", "C*", "B"], cx);
6841
6842        pane.update_in(cx, |pane, window, cx| {
6843            pane.swap_item_left(&Default::default(), window, cx);
6844        });
6845        assert_item_labels(&pane, ["C*", "A", "B"], cx);
6846
6847        pane.update_in(cx, |pane, window, cx| {
6848            pane.swap_item_left(&Default::default(), window, cx);
6849        });
6850        assert_item_labels(&pane, ["C*", "A", "B"], cx);
6851
6852        pane.update_in(cx, |pane, window, cx| {
6853            pane.swap_item_right(&Default::default(), window, cx);
6854        });
6855        assert_item_labels(&pane, ["A", "C*", "B"], cx);
6856    }
6857
6858    fn init_test(cx: &mut TestAppContext) {
6859        cx.update(|cx| {
6860            let settings_store = SettingsStore::test(cx);
6861            cx.set_global(settings_store);
6862            theme::init(LoadThemes::JustBase, cx);
6863            crate::init_settings(cx);
6864            Project::init_settings(cx);
6865        });
6866    }
6867
6868    fn set_max_tabs(cx: &mut TestAppContext, value: Option<usize>) {
6869        cx.update_global(|store: &mut SettingsStore, cx| {
6870            store.update_user_settings(cx, |settings| {
6871                settings.workspace.max_tabs = value.map(|v| NonZero::new(v).unwrap())
6872            });
6873        });
6874    }
6875
6876    fn add_labeled_item(
6877        pane: &Entity<Pane>,
6878        label: &str,
6879        is_dirty: bool,
6880        cx: &mut VisualTestContext,
6881    ) -> Box<Entity<TestItem>> {
6882        pane.update_in(cx, |pane, window, cx| {
6883            let labeled_item =
6884                Box::new(cx.new(|cx| TestItem::new(cx).with_label(label).with_dirty(is_dirty)));
6885            pane.add_item(labeled_item.clone(), false, false, None, window, cx);
6886            labeled_item
6887        })
6888    }
6889
6890    fn set_labeled_items<const COUNT: usize>(
6891        pane: &Entity<Pane>,
6892        labels: [&str; COUNT],
6893        cx: &mut VisualTestContext,
6894    ) -> [Box<Entity<TestItem>>; COUNT] {
6895        pane.update_in(cx, |pane, window, cx| {
6896            pane.items.clear();
6897            let mut active_item_index = 0;
6898
6899            let mut index = 0;
6900            let items = labels.map(|mut label| {
6901                if label.ends_with('*') {
6902                    label = label.trim_end_matches('*');
6903                    active_item_index = index;
6904                }
6905
6906                let labeled_item = Box::new(cx.new(|cx| TestItem::new(cx).with_label(label)));
6907                pane.add_item(labeled_item.clone(), false, false, None, window, cx);
6908                index += 1;
6909                labeled_item
6910            });
6911
6912            pane.activate_item(active_item_index, false, false, window, cx);
6913
6914            items
6915        })
6916    }
6917
6918    // Assert the item label, with the active item label suffixed with a '*'
6919    #[track_caller]
6920    fn assert_item_labels<const COUNT: usize>(
6921        pane: &Entity<Pane>,
6922        expected_states: [&str; COUNT],
6923        cx: &mut VisualTestContext,
6924    ) {
6925        let actual_states = pane.update(cx, |pane, cx| {
6926            pane.items
6927                .iter()
6928                .enumerate()
6929                .map(|(ix, item)| {
6930                    let mut state = item
6931                        .to_any()
6932                        .downcast::<TestItem>()
6933                        .unwrap()
6934                        .read(cx)
6935                        .label
6936                        .clone();
6937                    if ix == pane.active_item_index {
6938                        state.push('*');
6939                    }
6940                    if item.is_dirty(cx) {
6941                        state.push('^');
6942                    }
6943                    if pane.is_tab_pinned(ix) {
6944                        state.push('!');
6945                    }
6946                    state
6947                })
6948                .collect::<Vec<_>>()
6949        });
6950        assert_eq!(
6951            actual_states, expected_states,
6952            "pane items do not match expectation"
6953        );
6954    }
6955}