pane.rs

   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 == &current_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                        let task = item.clone_on_split(database_id, window, cx);
3296                        let to_pane = to_pane.downgrade();
3297                        cx.spawn_in(window, async move |_, cx| {
3298                            if let Some(item) = task.await {
3299                                to_pane
3300                                    .update_in(cx, |pane, window, cx| {
3301                                        pane.add_item(item, true, true, None, window, cx)
3302                                    })
3303                                    .ok();
3304                            }
3305                        })
3306                        .detach();
3307                    } else {
3308                        move_item(&from_pane, &to_pane, item_id, ix, true, window, cx);
3309                    }
3310                    to_pane.update(cx, |this, _| {
3311                        if to_pane == from_pane {
3312                            let actual_ix = this
3313                                .items
3314                                .iter()
3315                                .position(|item| item.item_id() == item_id)
3316                                .unwrap_or(0);
3317
3318                            let is_pinned_in_to_pane = this.is_tab_pinned(actual_ix);
3319
3320                            if !was_pinned_in_from_pane && is_pinned_in_to_pane {
3321                                this.pinned_tab_count += 1;
3322                            } else if was_pinned_in_from_pane && !is_pinned_in_to_pane {
3323                                this.pinned_tab_count -= 1;
3324                            }
3325                        } else if this.items.len() >= to_pane_old_length {
3326                            let is_pinned_in_to_pane = this.is_tab_pinned(ix);
3327                            let item_created_pane = to_pane_old_length == 0;
3328                            let is_first_position = ix == 0;
3329                            let was_dropped_at_beginning = item_created_pane || is_first_position;
3330                            let should_remain_pinned = is_pinned_in_to_pane
3331                                || (was_pinned_in_from_pane && was_dropped_at_beginning);
3332
3333                            if should_remain_pinned {
3334                                this.pinned_tab_count += 1;
3335                            }
3336                        }
3337                    });
3338                });
3339            })
3340            .log_err();
3341    }
3342
3343    fn handle_dragged_selection_drop(
3344        &mut self,
3345        dragged_selection: &DraggedSelection,
3346        dragged_onto: Option<usize>,
3347        window: &mut Window,
3348        cx: &mut Context<Self>,
3349    ) {
3350        if let Some(custom_drop_handle) = self.custom_drop_handle.clone()
3351            && let ControlFlow::Break(()) = custom_drop_handle(self, dragged_selection, window, cx)
3352        {
3353            return;
3354        }
3355        self.handle_project_entry_drop(
3356            &dragged_selection.active_selection.entry_id,
3357            dragged_onto,
3358            window,
3359            cx,
3360        );
3361    }
3362
3363    fn handle_project_entry_drop(
3364        &mut self,
3365        project_entry_id: &ProjectEntryId,
3366        target: Option<usize>,
3367        window: &mut Window,
3368        cx: &mut Context<Self>,
3369    ) {
3370        if let Some(custom_drop_handle) = self.custom_drop_handle.clone()
3371            && let ControlFlow::Break(()) = custom_drop_handle(self, project_entry_id, window, cx)
3372        {
3373            return;
3374        }
3375        let mut to_pane = cx.entity();
3376        let split_direction = self.drag_split_direction;
3377        let project_entry_id = *project_entry_id;
3378        self.workspace
3379            .update(cx, |_, cx| {
3380                cx.defer_in(window, move |workspace, window, cx| {
3381                    if let Some(project_path) = workspace
3382                        .project()
3383                        .read(cx)
3384                        .path_for_entry(project_entry_id, cx)
3385                    {
3386                        let load_path_task = workspace.load_path(project_path.clone(), window, cx);
3387                        cx.spawn_in(window, async move |workspace, cx| {
3388                            if let Some((project_entry_id, build_item)) =
3389                                load_path_task.await.notify_async_err(cx)
3390                            {
3391                                let (to_pane, new_item_handle) = workspace
3392                                    .update_in(cx, |workspace, window, cx| {
3393                                        if let Some(split_direction) = split_direction {
3394                                            to_pane = workspace.split_pane(
3395                                                to_pane,
3396                                                split_direction,
3397                                                window,
3398                                                cx,
3399                                            );
3400                                        }
3401                                        let new_item_handle = to_pane.update(cx, |pane, cx| {
3402                                            pane.open_item(
3403                                                project_entry_id,
3404                                                project_path,
3405                                                true,
3406                                                false,
3407                                                true,
3408                                                target,
3409                                                window,
3410                                                cx,
3411                                                build_item,
3412                                            )
3413                                        });
3414                                        (to_pane, new_item_handle)
3415                                    })
3416                                    .log_err()?;
3417                                to_pane
3418                                    .update_in(cx, |this, window, cx| {
3419                                        let Some(index) = this.index_for_item(&*new_item_handle)
3420                                        else {
3421                                            return;
3422                                        };
3423
3424                                        if target.is_some_and(|target| this.is_tab_pinned(target)) {
3425                                            this.pin_tab_at(index, window, cx);
3426                                        }
3427                                    })
3428                                    .ok()?
3429                            }
3430                            Some(())
3431                        })
3432                        .detach();
3433                    };
3434                });
3435            })
3436            .log_err();
3437    }
3438
3439    fn handle_external_paths_drop(
3440        &mut self,
3441        paths: &ExternalPaths,
3442        window: &mut Window,
3443        cx: &mut Context<Self>,
3444    ) {
3445        if let Some(custom_drop_handle) = self.custom_drop_handle.clone()
3446            && let ControlFlow::Break(()) = custom_drop_handle(self, paths, window, cx)
3447        {
3448            return;
3449        }
3450        let mut to_pane = cx.entity();
3451        let mut split_direction = self.drag_split_direction;
3452        let paths = paths.paths().to_vec();
3453        let is_remote = self
3454            .workspace
3455            .update(cx, |workspace, cx| {
3456                if workspace.project().read(cx).is_via_collab() {
3457                    workspace.show_error(
3458                        &anyhow::anyhow!("Cannot drop files on a remote project"),
3459                        cx,
3460                    );
3461                    true
3462                } else {
3463                    false
3464                }
3465            })
3466            .unwrap_or(true);
3467        if is_remote {
3468            return;
3469        }
3470
3471        self.workspace
3472            .update(cx, |workspace, cx| {
3473                let fs = Arc::clone(workspace.project().read(cx).fs());
3474                cx.spawn_in(window, async move |workspace, cx| {
3475                    let mut is_file_checks = FuturesUnordered::new();
3476                    for path in &paths {
3477                        is_file_checks.push(fs.is_file(path))
3478                    }
3479                    let mut has_files_to_open = false;
3480                    while let Some(is_file) = is_file_checks.next().await {
3481                        if is_file {
3482                            has_files_to_open = true;
3483                            break;
3484                        }
3485                    }
3486                    drop(is_file_checks);
3487                    if !has_files_to_open {
3488                        split_direction = None;
3489                    }
3490
3491                    if let Ok((open_task, to_pane)) =
3492                        workspace.update_in(cx, |workspace, window, cx| {
3493                            if let Some(split_direction) = split_direction {
3494                                to_pane =
3495                                    workspace.split_pane(to_pane, split_direction, window, cx);
3496                            }
3497                            (
3498                                workspace.open_paths(
3499                                    paths,
3500                                    OpenOptions {
3501                                        visible: Some(OpenVisible::OnlyDirectories),
3502                                        ..Default::default()
3503                                    },
3504                                    Some(to_pane.downgrade()),
3505                                    window,
3506                                    cx,
3507                                ),
3508                                to_pane,
3509                            )
3510                        })
3511                    {
3512                        let opened_items: Vec<_> = open_task.await;
3513                        _ = workspace.update_in(cx, |workspace, window, cx| {
3514                            for item in opened_items.into_iter().flatten() {
3515                                if let Err(e) = item {
3516                                    workspace.show_error(&e, cx);
3517                                }
3518                            }
3519                            if to_pane.read(cx).items_len() == 0 {
3520                                workspace.remove_pane(to_pane, None, window, cx);
3521                            }
3522                        });
3523                    }
3524                })
3525                .detach();
3526            })
3527            .log_err();
3528    }
3529
3530    pub fn display_nav_history_buttons(&mut self, display: Option<bool>) {
3531        self.display_nav_history_buttons = display;
3532    }
3533
3534    fn pinned_item_ids(&self) -> Vec<EntityId> {
3535        self.items
3536            .iter()
3537            .enumerate()
3538            .filter_map(|(index, item)| {
3539                if self.is_tab_pinned(index) {
3540                    return Some(item.item_id());
3541                }
3542
3543                None
3544            })
3545            .collect()
3546    }
3547
3548    fn clean_item_ids(&self, cx: &mut Context<Pane>) -> Vec<EntityId> {
3549        self.items()
3550            .filter_map(|item| {
3551                if !item.is_dirty(cx) {
3552                    return Some(item.item_id());
3553                }
3554
3555                None
3556            })
3557            .collect()
3558    }
3559
3560    fn to_the_side_item_ids(&self, item_id: EntityId, side: Side) -> Vec<EntityId> {
3561        match side {
3562            Side::Left => self
3563                .items()
3564                .take_while(|item| item.item_id() != item_id)
3565                .map(|item| item.item_id())
3566                .collect(),
3567            Side::Right => self
3568                .items()
3569                .rev()
3570                .take_while(|item| item.item_id() != item_id)
3571                .map(|item| item.item_id())
3572                .collect(),
3573        }
3574    }
3575
3576    fn multibuffer_item_ids(&self, cx: &mut Context<Pane>) -> Vec<EntityId> {
3577        self.items()
3578            .filter(|item| item.buffer_kind(cx) == ItemBufferKind::Multibuffer)
3579            .map(|item| item.item_id())
3580            .collect()
3581    }
3582
3583    pub fn drag_split_direction(&self) -> Option<SplitDirection> {
3584        self.drag_split_direction
3585    }
3586
3587    pub fn set_zoom_out_on_close(&mut self, zoom_out_on_close: bool) {
3588        self.zoom_out_on_close = zoom_out_on_close;
3589    }
3590}
3591
3592fn default_render_tab_bar_buttons(
3593    pane: &mut Pane,
3594    window: &mut Window,
3595    cx: &mut Context<Pane>,
3596) -> (Option<AnyElement>, Option<AnyElement>) {
3597    if !pane.has_focus(window, cx) && !pane.context_menu_focused(window, cx) {
3598        return (None, None);
3599    }
3600    // Ideally we would return a vec of elements here to pass directly to the [TabBar]'s
3601    // `end_slot`, but due to needing a view here that isn't possible.
3602    let right_children = h_flex()
3603        // Instead we need to replicate the spacing from the [TabBar]'s `end_slot` here.
3604        .gap(DynamicSpacing::Base04.rems(cx))
3605        .child(
3606            PopoverMenu::new("pane-tab-bar-popover-menu")
3607                .trigger_with_tooltip(
3608                    IconButton::new("plus", IconName::Plus).icon_size(IconSize::Small),
3609                    Tooltip::text("New..."),
3610                )
3611                .anchor(Corner::TopRight)
3612                .with_handle(pane.new_item_context_menu_handle.clone())
3613                .menu(move |window, cx| {
3614                    Some(ContextMenu::build(window, cx, |menu, _, _| {
3615                        menu.action("New File", NewFile.boxed_clone())
3616                            .action("Open File", ToggleFileFinder::default().boxed_clone())
3617                            .separator()
3618                            .action(
3619                                "Search Project",
3620                                DeploySearch {
3621                                    replace_enabled: false,
3622                                    included_files: None,
3623                                    excluded_files: None,
3624                                }
3625                                .boxed_clone(),
3626                            )
3627                            .action("Search Symbols", ToggleProjectSymbols.boxed_clone())
3628                            .separator()
3629                            .action("New Terminal", NewTerminal.boxed_clone())
3630                    }))
3631                }),
3632        )
3633        .child(
3634            PopoverMenu::new("pane-tab-bar-split")
3635                .trigger_with_tooltip(
3636                    IconButton::new("split", IconName::Split).icon_size(IconSize::Small),
3637                    Tooltip::text("Split Pane"),
3638                )
3639                .anchor(Corner::TopRight)
3640                .with_handle(pane.split_item_context_menu_handle.clone())
3641                .menu(move |window, cx| {
3642                    ContextMenu::build(window, cx, |menu, _, _| {
3643                        menu.action("Split Right", SplitRight.boxed_clone())
3644                            .action("Split Left", SplitLeft.boxed_clone())
3645                            .action("Split Up", SplitUp.boxed_clone())
3646                            .action("Split Down", SplitDown.boxed_clone())
3647                    })
3648                    .into()
3649                }),
3650        )
3651        .child({
3652            let zoomed = pane.is_zoomed();
3653            IconButton::new("toggle_zoom", IconName::Maximize)
3654                .icon_size(IconSize::Small)
3655                .toggle_state(zoomed)
3656                .selected_icon(IconName::Minimize)
3657                .on_click(cx.listener(|pane, _, window, cx| {
3658                    pane.toggle_zoom(&crate::ToggleZoom, window, cx);
3659                }))
3660                .tooltip(move |_window, cx| {
3661                    Tooltip::for_action(
3662                        if zoomed { "Zoom Out" } else { "Zoom In" },
3663                        &ToggleZoom,
3664                        cx,
3665                    )
3666                })
3667        })
3668        .into_any_element()
3669        .into();
3670    (None, right_children)
3671}
3672
3673impl Focusable for Pane {
3674    fn focus_handle(&self, _cx: &App) -> FocusHandle {
3675        self.focus_handle.clone()
3676    }
3677}
3678
3679impl Render for Pane {
3680    fn render(&mut self, window: &mut Window, cx: &mut Context<Self>) -> impl IntoElement {
3681        let mut key_context = KeyContext::new_with_defaults();
3682        key_context.add("Pane");
3683        if self.active_item().is_none() {
3684            key_context.add("EmptyPane");
3685        }
3686
3687        let should_display_tab_bar = self.should_display_tab_bar.clone();
3688        let display_tab_bar = should_display_tab_bar(window, cx);
3689        let Some(project) = self.project.upgrade() else {
3690            return div().track_focus(&self.focus_handle(cx));
3691        };
3692        let is_local = project.read(cx).is_local();
3693
3694        v_flex()
3695            .key_context(key_context)
3696            .track_focus(&self.focus_handle(cx))
3697            .size_full()
3698            .flex_none()
3699            .overflow_hidden()
3700            .on_action(
3701                cx.listener(|pane, _: &SplitLeft, _, cx| pane.split(SplitDirection::Left, cx)),
3702            )
3703            .on_action(cx.listener(|pane, _: &SplitUp, _, cx| pane.split(SplitDirection::Up, cx)))
3704            .on_action(cx.listener(|pane, _: &SplitHorizontal, _, cx| {
3705                pane.split(SplitDirection::horizontal(cx), cx)
3706            }))
3707            .on_action(cx.listener(|pane, _: &SplitVertical, _, cx| {
3708                pane.split(SplitDirection::vertical(cx), cx)
3709            }))
3710            .on_action(
3711                cx.listener(|pane, _: &SplitRight, _, cx| pane.split(SplitDirection::Right, cx)),
3712            )
3713            .on_action(
3714                cx.listener(|pane, _: &SplitDown, _, cx| pane.split(SplitDirection::Down, cx)),
3715            )
3716            .on_action(cx.listener(|pane, _: &SplitAndMoveUp, _, cx| {
3717                pane.split_and_move(SplitDirection::Up, cx)
3718            }))
3719            .on_action(cx.listener(|pane, _: &SplitAndMoveDown, _, cx| {
3720                pane.split_and_move(SplitDirection::Down, cx)
3721            }))
3722            .on_action(cx.listener(|pane, _: &SplitAndMoveLeft, _, cx| {
3723                pane.split_and_move(SplitDirection::Left, cx)
3724            }))
3725            .on_action(cx.listener(|pane, _: &SplitAndMoveRight, _, cx| {
3726                pane.split_and_move(SplitDirection::Right, cx)
3727            }))
3728            .on_action(cx.listener(|_, _: &JoinIntoNext, _, cx| {
3729                cx.emit(Event::JoinIntoNext);
3730            }))
3731            .on_action(cx.listener(|_, _: &JoinAll, _, cx| {
3732                cx.emit(Event::JoinAll);
3733            }))
3734            .on_action(cx.listener(Pane::toggle_zoom))
3735            .on_action(cx.listener(Self::navigate_backward))
3736            .on_action(cx.listener(Self::navigate_forward))
3737            .on_action(
3738                cx.listener(|pane: &mut Pane, action: &ActivateItem, window, cx| {
3739                    pane.activate_item(
3740                        action.0.min(pane.items.len().saturating_sub(1)),
3741                        true,
3742                        true,
3743                        window,
3744                        cx,
3745                    );
3746                }),
3747            )
3748            .on_action(cx.listener(Self::alternate_file))
3749            .on_action(cx.listener(Self::activate_last_item))
3750            .on_action(cx.listener(Self::activate_previous_item))
3751            .on_action(cx.listener(Self::activate_next_item))
3752            .on_action(cx.listener(Self::swap_item_left))
3753            .on_action(cx.listener(Self::swap_item_right))
3754            .on_action(cx.listener(Self::toggle_pin_tab))
3755            .on_action(cx.listener(Self::unpin_all_tabs))
3756            .when(PreviewTabsSettings::get_global(cx).enabled, |this| {
3757                this.on_action(cx.listener(|pane: &mut Pane, _: &TogglePreviewTab, _, cx| {
3758                    if let Some(active_item_id) = pane.active_item().map(|i| i.item_id()) {
3759                        if pane.is_active_preview_item(active_item_id) {
3760                            pane.set_preview_item_id(None, cx);
3761                        } else {
3762                            pane.set_preview_item_id(Some(active_item_id), cx);
3763                        }
3764                    }
3765                }))
3766            })
3767            .on_action(
3768                cx.listener(|pane: &mut Self, action: &CloseActiveItem, window, cx| {
3769                    pane.close_active_item(action, window, cx)
3770                        .detach_and_log_err(cx)
3771                }),
3772            )
3773            .on_action(
3774                cx.listener(|pane: &mut Self, action: &CloseOtherItems, window, cx| {
3775                    pane.close_other_items(action, None, window, cx)
3776                        .detach_and_log_err(cx);
3777                }),
3778            )
3779            .on_action(
3780                cx.listener(|pane: &mut Self, action: &CloseCleanItems, window, cx| {
3781                    pane.close_clean_items(action, window, cx)
3782                        .detach_and_log_err(cx)
3783                }),
3784            )
3785            .on_action(cx.listener(
3786                |pane: &mut Self, action: &CloseItemsToTheLeft, window, cx| {
3787                    pane.close_items_to_the_left_by_id(None, action, window, cx)
3788                        .detach_and_log_err(cx)
3789                },
3790            ))
3791            .on_action(cx.listener(
3792                |pane: &mut Self, action: &CloseItemsToTheRight, window, cx| {
3793                    pane.close_items_to_the_right_by_id(None, action, window, cx)
3794                        .detach_and_log_err(cx)
3795                },
3796            ))
3797            .on_action(
3798                cx.listener(|pane: &mut Self, action: &CloseAllItems, window, cx| {
3799                    pane.close_all_items(action, window, cx)
3800                        .detach_and_log_err(cx)
3801                }),
3802            )
3803            .on_action(cx.listener(
3804                |pane: &mut Self, action: &CloseMultibufferItems, window, cx| {
3805                    pane.close_multibuffer_items(action, window, cx)
3806                        .detach_and_log_err(cx)
3807                },
3808            ))
3809            .on_action(
3810                cx.listener(|pane: &mut Self, action: &RevealInProjectPanel, _, cx| {
3811                    let entry_id = action
3812                        .entry_id
3813                        .map(ProjectEntryId::from_proto)
3814                        .or_else(|| pane.active_item()?.project_entry_ids(cx).first().copied());
3815                    if let Some(entry_id) = entry_id {
3816                        pane.project
3817                            .update(cx, |_, cx| {
3818                                cx.emit(project::Event::RevealInProjectPanel(entry_id))
3819                            })
3820                            .ok();
3821                    }
3822                }),
3823            )
3824            .on_action(cx.listener(|_, _: &menu::Cancel, window, cx| {
3825                if cx.stop_active_drag(window) {
3826                } else {
3827                    cx.propagate();
3828                }
3829            }))
3830            .when(self.active_item().is_some() && display_tab_bar, |pane| {
3831                pane.child((self.render_tab_bar.clone())(self, window, cx))
3832            })
3833            .child({
3834                let has_worktrees = project.read(cx).visible_worktrees(cx).next().is_some();
3835                // main content
3836                div()
3837                    .flex_1()
3838                    .relative()
3839                    .group("")
3840                    .overflow_hidden()
3841                    .on_drag_move::<DraggedTab>(cx.listener(Self::handle_drag_move))
3842                    .on_drag_move::<DraggedSelection>(cx.listener(Self::handle_drag_move))
3843                    .when(is_local, |div| {
3844                        div.on_drag_move::<ExternalPaths>(cx.listener(Self::handle_drag_move))
3845                    })
3846                    .map(|div| {
3847                        if let Some(item) = self.active_item() {
3848                            div.id("pane_placeholder")
3849                                .v_flex()
3850                                .size_full()
3851                                .overflow_hidden()
3852                                .child(self.toolbar.clone())
3853                                .child(item.to_any())
3854                        } else {
3855                            let placeholder = div
3856                                .id("pane_placeholder")
3857                                .h_flex()
3858                                .size_full()
3859                                .justify_center()
3860                                .on_click(cx.listener(
3861                                    move |this, event: &ClickEvent, window, cx| {
3862                                        if event.click_count() == 2 {
3863                                            window.dispatch_action(
3864                                                this.double_click_dispatch_action.boxed_clone(),
3865                                                cx,
3866                                            );
3867                                        }
3868                                    },
3869                                ));
3870                            if has_worktrees {
3871                                placeholder
3872                            } else {
3873                                placeholder.child(
3874                                    Label::new("Open a file or project to get started.")
3875                                        .color(Color::Muted),
3876                                )
3877                            }
3878                        }
3879                    })
3880                    .child(
3881                        // drag target
3882                        div()
3883                            .invisible()
3884                            .absolute()
3885                            .bg(cx.theme().colors().drop_target_background)
3886                            .group_drag_over::<DraggedTab>("", |style| style.visible())
3887                            .group_drag_over::<DraggedSelection>("", |style| style.visible())
3888                            .when(is_local, |div| {
3889                                div.group_drag_over::<ExternalPaths>("", |style| style.visible())
3890                            })
3891                            .when_some(self.can_drop_predicate.clone(), |this, p| {
3892                                this.can_drop(move |a, window, cx| p(a, window, cx))
3893                            })
3894                            .on_drop(cx.listener(move |this, dragged_tab, window, cx| {
3895                                this.handle_tab_drop(
3896                                    dragged_tab,
3897                                    this.active_item_index(),
3898                                    window,
3899                                    cx,
3900                                )
3901                            }))
3902                            .on_drop(cx.listener(
3903                                move |this, selection: &DraggedSelection, window, cx| {
3904                                    this.handle_dragged_selection_drop(selection, None, window, cx)
3905                                },
3906                            ))
3907                            .on_drop(cx.listener(move |this, paths, window, cx| {
3908                                this.handle_external_paths_drop(paths, window, cx)
3909                            }))
3910                            .map(|div| {
3911                                let size = DefiniteLength::Fraction(0.5);
3912                                match self.drag_split_direction {
3913                                    None => div.top_0().right_0().bottom_0().left_0(),
3914                                    Some(SplitDirection::Up) => {
3915                                        div.top_0().left_0().right_0().h(size)
3916                                    }
3917                                    Some(SplitDirection::Down) => {
3918                                        div.left_0().bottom_0().right_0().h(size)
3919                                    }
3920                                    Some(SplitDirection::Left) => {
3921                                        div.top_0().left_0().bottom_0().w(size)
3922                                    }
3923                                    Some(SplitDirection::Right) => {
3924                                        div.top_0().bottom_0().right_0().w(size)
3925                                    }
3926                                }
3927                            }),
3928                    )
3929            })
3930            .on_mouse_down(
3931                MouseButton::Navigate(NavigationDirection::Back),
3932                cx.listener(|pane, _, window, cx| {
3933                    if let Some(workspace) = pane.workspace.upgrade() {
3934                        let pane = cx.entity().downgrade();
3935                        window.defer(cx, move |window, cx| {
3936                            workspace.update(cx, |workspace, cx| {
3937                                workspace.go_back(pane, window, cx).detach_and_log_err(cx)
3938                            })
3939                        })
3940                    }
3941                }),
3942            )
3943            .on_mouse_down(
3944                MouseButton::Navigate(NavigationDirection::Forward),
3945                cx.listener(|pane, _, window, cx| {
3946                    if let Some(workspace) = pane.workspace.upgrade() {
3947                        let pane = cx.entity().downgrade();
3948                        window.defer(cx, move |window, cx| {
3949                            workspace.update(cx, |workspace, cx| {
3950                                workspace
3951                                    .go_forward(pane, window, cx)
3952                                    .detach_and_log_err(cx)
3953                            })
3954                        })
3955                    }
3956                }),
3957            )
3958    }
3959}
3960
3961impl ItemNavHistory {
3962    pub fn push<D: 'static + Send + Any>(&mut self, data: Option<D>, cx: &mut App) {
3963        if self
3964            .item
3965            .upgrade()
3966            .is_some_and(|item| item.include_in_nav_history())
3967        {
3968            self.history
3969                .push(data, self.item.clone(), self.is_preview, cx);
3970        }
3971    }
3972
3973    pub fn pop_backward(&mut self, cx: &mut App) -> Option<NavigationEntry> {
3974        self.history.pop(NavigationMode::GoingBack, cx)
3975    }
3976
3977    pub fn pop_forward(&mut self, cx: &mut App) -> Option<NavigationEntry> {
3978        self.history.pop(NavigationMode::GoingForward, cx)
3979    }
3980}
3981
3982impl NavHistory {
3983    pub fn for_each_entry(
3984        &self,
3985        cx: &App,
3986        mut f: impl FnMut(&NavigationEntry, (ProjectPath, Option<PathBuf>)),
3987    ) {
3988        let borrowed_history = self.0.lock();
3989        borrowed_history
3990            .forward_stack
3991            .iter()
3992            .chain(borrowed_history.backward_stack.iter())
3993            .chain(borrowed_history.closed_stack.iter())
3994            .for_each(|entry| {
3995                if let Some(project_and_abs_path) =
3996                    borrowed_history.paths_by_item.get(&entry.item.id())
3997                {
3998                    f(entry, project_and_abs_path.clone());
3999                } else if let Some(item) = entry.item.upgrade()
4000                    && let Some(path) = item.project_path(cx)
4001                {
4002                    f(entry, (path, None));
4003                }
4004            })
4005    }
4006
4007    pub fn set_mode(&mut self, mode: NavigationMode) {
4008        self.0.lock().mode = mode;
4009    }
4010
4011    pub fn mode(&self) -> NavigationMode {
4012        self.0.lock().mode
4013    }
4014
4015    pub fn disable(&mut self) {
4016        self.0.lock().mode = NavigationMode::Disabled;
4017    }
4018
4019    pub fn enable(&mut self) {
4020        self.0.lock().mode = NavigationMode::Normal;
4021    }
4022
4023    pub fn pop(&mut self, mode: NavigationMode, cx: &mut App) -> Option<NavigationEntry> {
4024        let mut state = self.0.lock();
4025        let entry = match mode {
4026            NavigationMode::Normal | NavigationMode::Disabled | NavigationMode::ClosingItem => {
4027                return None;
4028            }
4029            NavigationMode::GoingBack => &mut state.backward_stack,
4030            NavigationMode::GoingForward => &mut state.forward_stack,
4031            NavigationMode::ReopeningClosedItem => &mut state.closed_stack,
4032        }
4033        .pop_back();
4034        if entry.is_some() {
4035            state.did_update(cx);
4036        }
4037        entry
4038    }
4039
4040    pub fn push<D: 'static + Send + Any>(
4041        &mut self,
4042        data: Option<D>,
4043        item: Arc<dyn WeakItemHandle>,
4044        is_preview: bool,
4045        cx: &mut App,
4046    ) {
4047        let state = &mut *self.0.lock();
4048        match state.mode {
4049            NavigationMode::Disabled => {}
4050            NavigationMode::Normal | NavigationMode::ReopeningClosedItem => {
4051                if state.backward_stack.len() >= MAX_NAVIGATION_HISTORY_LEN {
4052                    state.backward_stack.pop_front();
4053                }
4054                state.backward_stack.push_back(NavigationEntry {
4055                    item,
4056                    data: data.map(|data| Box::new(data) as Box<dyn Any + Send>),
4057                    timestamp: state.next_timestamp.fetch_add(1, Ordering::SeqCst),
4058                    is_preview,
4059                });
4060                state.forward_stack.clear();
4061            }
4062            NavigationMode::GoingBack => {
4063                if state.forward_stack.len() >= MAX_NAVIGATION_HISTORY_LEN {
4064                    state.forward_stack.pop_front();
4065                }
4066                state.forward_stack.push_back(NavigationEntry {
4067                    item,
4068                    data: data.map(|data| Box::new(data) as Box<dyn Any + Send>),
4069                    timestamp: state.next_timestamp.fetch_add(1, Ordering::SeqCst),
4070                    is_preview,
4071                });
4072            }
4073            NavigationMode::GoingForward => {
4074                if state.backward_stack.len() >= MAX_NAVIGATION_HISTORY_LEN {
4075                    state.backward_stack.pop_front();
4076                }
4077                state.backward_stack.push_back(NavigationEntry {
4078                    item,
4079                    data: data.map(|data| Box::new(data) as Box<dyn Any + Send>),
4080                    timestamp: state.next_timestamp.fetch_add(1, Ordering::SeqCst),
4081                    is_preview,
4082                });
4083            }
4084            NavigationMode::ClosingItem => {
4085                if state.closed_stack.len() >= MAX_NAVIGATION_HISTORY_LEN {
4086                    state.closed_stack.pop_front();
4087                }
4088                state.closed_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        }
4096        state.did_update(cx);
4097    }
4098
4099    pub fn remove_item(&mut self, item_id: EntityId) {
4100        let mut state = self.0.lock();
4101        state.paths_by_item.remove(&item_id);
4102        state
4103            .backward_stack
4104            .retain(|entry| entry.item.id() != item_id);
4105        state
4106            .forward_stack
4107            .retain(|entry| entry.item.id() != item_id);
4108        state
4109            .closed_stack
4110            .retain(|entry| entry.item.id() != item_id);
4111    }
4112
4113    pub fn path_for_item(&self, item_id: EntityId) -> Option<(ProjectPath, Option<PathBuf>)> {
4114        self.0.lock().paths_by_item.get(&item_id).cloned()
4115    }
4116}
4117
4118impl NavHistoryState {
4119    pub fn did_update(&self, cx: &mut App) {
4120        if let Some(pane) = self.pane.upgrade() {
4121            cx.defer(move |cx| {
4122                pane.update(cx, |pane, cx| pane.history_updated(cx));
4123            });
4124        }
4125    }
4126}
4127
4128fn dirty_message_for(buffer_path: Option<ProjectPath>, path_style: PathStyle) -> String {
4129    let path = buffer_path
4130        .as_ref()
4131        .and_then(|p| {
4132            let path = p.path.display(path_style);
4133            if path.is_empty() { None } else { Some(path) }
4134        })
4135        .unwrap_or("This buffer".into());
4136    let path = truncate_and_remove_front(&path, 80);
4137    format!("{path} contains unsaved edits. Do you want to save it?")
4138}
4139
4140pub fn tab_details(items: &[Box<dyn ItemHandle>], _window: &Window, cx: &App) -> Vec<usize> {
4141    let mut tab_details = items.iter().map(|_| 0).collect::<Vec<_>>();
4142    let mut tab_descriptions = HashMap::default();
4143    let mut done = false;
4144    while !done {
4145        done = true;
4146
4147        // Store item indices by their tab description.
4148        for (ix, (item, detail)) in items.iter().zip(&tab_details).enumerate() {
4149            let description = item.tab_content_text(*detail, cx);
4150            if *detail == 0 || description != item.tab_content_text(detail - 1, cx) {
4151                tab_descriptions
4152                    .entry(description)
4153                    .or_insert(Vec::new())
4154                    .push(ix);
4155            }
4156        }
4157
4158        // If two or more items have the same tab description, increase their level
4159        // of detail and try again.
4160        for (_, item_ixs) in tab_descriptions.drain() {
4161            if item_ixs.len() > 1 {
4162                done = false;
4163                for ix in item_ixs {
4164                    tab_details[ix] += 1;
4165                }
4166            }
4167        }
4168    }
4169
4170    tab_details
4171}
4172
4173pub fn render_item_indicator(item: Box<dyn ItemHandle>, cx: &App) -> Option<Indicator> {
4174    maybe!({
4175        let indicator_color = match (item.has_conflict(cx), item.is_dirty(cx)) {
4176            (true, _) => Color::Warning,
4177            (_, true) => Color::Accent,
4178            (false, false) => return None,
4179        };
4180
4181        Some(Indicator::dot().color(indicator_color))
4182    })
4183}
4184
4185impl Render for DraggedTab {
4186    fn render(&mut self, window: &mut Window, cx: &mut Context<Self>) -> impl IntoElement {
4187        let ui_font = ThemeSettings::get_global(cx).ui_font.clone();
4188        let label = self.item.tab_content(
4189            TabContentParams {
4190                detail: Some(self.detail),
4191                selected: false,
4192                preview: false,
4193                deemphasized: false,
4194            },
4195            window,
4196            cx,
4197        );
4198        Tab::new("")
4199            .toggle_state(self.is_active)
4200            .child(label)
4201            .render(window, cx)
4202            .font(ui_font)
4203    }
4204}
4205
4206#[cfg(test)]
4207mod tests {
4208    use std::num::NonZero;
4209
4210    use super::*;
4211    use crate::item::test::{TestItem, TestProjectItem};
4212    use gpui::{TestAppContext, VisualTestContext, size};
4213    use project::FakeFs;
4214    use settings::SettingsStore;
4215    use theme::LoadThemes;
4216    use util::TryFutureExt;
4217
4218    #[gpui::test]
4219    async fn test_add_item_capped_to_max_tabs(cx: &mut TestAppContext) {
4220        init_test(cx);
4221        let fs = FakeFs::new(cx.executor());
4222
4223        let project = Project::test(fs, None, cx).await;
4224        let (workspace, cx) =
4225            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
4226        let pane = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
4227
4228        for i in 0..7 {
4229            add_labeled_item(&pane, format!("{}", i).as_str(), false, cx);
4230        }
4231
4232        set_max_tabs(cx, Some(5));
4233        add_labeled_item(&pane, "7", false, cx);
4234        // Remove items to respect the max tab cap.
4235        assert_item_labels(&pane, ["3", "4", "5", "6", "7*"], cx);
4236        pane.update_in(cx, |pane, window, cx| {
4237            pane.activate_item(0, false, false, window, cx);
4238        });
4239        add_labeled_item(&pane, "X", false, cx);
4240        // Respect activation order.
4241        assert_item_labels(&pane, ["3", "X*", "5", "6", "7"], cx);
4242
4243        for i in 0..7 {
4244            add_labeled_item(&pane, format!("D{}", i).as_str(), true, cx);
4245        }
4246        // Keeps dirty items, even over max tab cap.
4247        assert_item_labels(
4248            &pane,
4249            ["D0^", "D1^", "D2^", "D3^", "D4^", "D5^", "D6*^"],
4250            cx,
4251        );
4252
4253        set_max_tabs(cx, None);
4254        for i in 0..7 {
4255            add_labeled_item(&pane, format!("N{}", i).as_str(), false, cx);
4256        }
4257        // No cap when max tabs is None.
4258        assert_item_labels(
4259            &pane,
4260            [
4261                "D0^", "D1^", "D2^", "D3^", "D4^", "D5^", "D6^", "N0", "N1", "N2", "N3", "N4",
4262                "N5", "N6*",
4263            ],
4264            cx,
4265        );
4266    }
4267
4268    #[gpui::test]
4269    async fn test_reduce_max_tabs_closes_existing_items(cx: &mut TestAppContext) {
4270        init_test(cx);
4271        let fs = FakeFs::new(cx.executor());
4272
4273        let project = Project::test(fs, None, cx).await;
4274        let (workspace, cx) =
4275            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
4276        let pane = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
4277
4278        add_labeled_item(&pane, "A", false, cx);
4279        add_labeled_item(&pane, "B", false, cx);
4280        let item_c = add_labeled_item(&pane, "C", false, cx);
4281        let item_d = add_labeled_item(&pane, "D", false, cx);
4282        add_labeled_item(&pane, "E", false, cx);
4283        add_labeled_item(&pane, "Settings", false, cx);
4284        assert_item_labels(&pane, ["A", "B", "C", "D", "E", "Settings*"], cx);
4285
4286        set_max_tabs(cx, Some(5));
4287        assert_item_labels(&pane, ["B", "C", "D", "E", "Settings*"], cx);
4288
4289        set_max_tabs(cx, Some(4));
4290        assert_item_labels(&pane, ["C", "D", "E", "Settings*"], cx);
4291
4292        pane.update_in(cx, |pane, window, cx| {
4293            let ix = pane.index_for_item_id(item_c.item_id()).unwrap();
4294            pane.pin_tab_at(ix, window, cx);
4295
4296            let ix = pane.index_for_item_id(item_d.item_id()).unwrap();
4297            pane.pin_tab_at(ix, window, cx);
4298        });
4299        assert_item_labels(&pane, ["C!", "D!", "E", "Settings*"], cx);
4300
4301        set_max_tabs(cx, Some(2));
4302        assert_item_labels(&pane, ["C!", "D!", "Settings*"], cx);
4303    }
4304
4305    #[gpui::test]
4306    async fn test_allow_pinning_dirty_item_at_max_tabs(cx: &mut TestAppContext) {
4307        init_test(cx);
4308        let fs = FakeFs::new(cx.executor());
4309
4310        let project = Project::test(fs, None, cx).await;
4311        let (workspace, cx) =
4312            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
4313        let pane = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
4314
4315        set_max_tabs(cx, Some(1));
4316        let item_a = add_labeled_item(&pane, "A", true, cx);
4317
4318        pane.update_in(cx, |pane, window, cx| {
4319            let ix = pane.index_for_item_id(item_a.item_id()).unwrap();
4320            pane.pin_tab_at(ix, window, cx);
4321        });
4322        assert_item_labels(&pane, ["A*^!"], cx);
4323    }
4324
4325    #[gpui::test]
4326    async fn test_allow_pinning_non_dirty_item_at_max_tabs(cx: &mut TestAppContext) {
4327        init_test(cx);
4328        let fs = FakeFs::new(cx.executor());
4329
4330        let project = Project::test(fs, None, cx).await;
4331        let (workspace, cx) =
4332            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
4333        let pane = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
4334
4335        set_max_tabs(cx, Some(1));
4336        let item_a = add_labeled_item(&pane, "A", false, cx);
4337
4338        pane.update_in(cx, |pane, window, cx| {
4339            let ix = pane.index_for_item_id(item_a.item_id()).unwrap();
4340            pane.pin_tab_at(ix, window, cx);
4341        });
4342        assert_item_labels(&pane, ["A*!"], cx);
4343    }
4344
4345    #[gpui::test]
4346    async fn test_pin_tabs_incrementally_at_max_capacity(cx: &mut TestAppContext) {
4347        init_test(cx);
4348        let fs = FakeFs::new(cx.executor());
4349
4350        let project = Project::test(fs, None, cx).await;
4351        let (workspace, cx) =
4352            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
4353        let pane = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
4354
4355        set_max_tabs(cx, Some(3));
4356
4357        let item_a = add_labeled_item(&pane, "A", false, cx);
4358        assert_item_labels(&pane, ["A*"], 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        let item_b = add_labeled_item(&pane, "B", false, cx);
4367        assert_item_labels(&pane, ["A!", "B*"], cx);
4368
4369        pane.update_in(cx, |pane, window, cx| {
4370            let ix = pane.index_for_item_id(item_b.item_id()).unwrap();
4371            pane.pin_tab_at(ix, window, cx);
4372        });
4373        assert_item_labels(&pane, ["A!", "B*!"], cx);
4374
4375        let item_c = add_labeled_item(&pane, "C", false, cx);
4376        assert_item_labels(&pane, ["A!", "B!", "C*"], cx);
4377
4378        pane.update_in(cx, |pane, window, cx| {
4379            let ix = pane.index_for_item_id(item_c.item_id()).unwrap();
4380            pane.pin_tab_at(ix, window, cx);
4381        });
4382        assert_item_labels(&pane, ["A!", "B!", "C*!"], cx);
4383    }
4384
4385    #[gpui::test]
4386    async fn test_pin_tabs_left_to_right_after_opening_at_max_capacity(cx: &mut TestAppContext) {
4387        init_test(cx);
4388        let fs = FakeFs::new(cx.executor());
4389
4390        let project = Project::test(fs, None, cx).await;
4391        let (workspace, cx) =
4392            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
4393        let pane = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
4394
4395        set_max_tabs(cx, Some(3));
4396
4397        let item_a = add_labeled_item(&pane, "A", false, cx);
4398        assert_item_labels(&pane, ["A*"], cx);
4399
4400        let item_b = add_labeled_item(&pane, "B", false, cx);
4401        assert_item_labels(&pane, ["A", "B*"], cx);
4402
4403        let item_c = add_labeled_item(&pane, "C", false, cx);
4404        assert_item_labels(&pane, ["A", "B", "C*"], cx);
4405
4406        pane.update_in(cx, |pane, window, cx| {
4407            let ix = pane.index_for_item_id(item_a.item_id()).unwrap();
4408            pane.pin_tab_at(ix, window, cx);
4409        });
4410        assert_item_labels(&pane, ["A!", "B", "C*"], cx);
4411
4412        pane.update_in(cx, |pane, window, cx| {
4413            let ix = pane.index_for_item_id(item_b.item_id()).unwrap();
4414            pane.pin_tab_at(ix, window, cx);
4415        });
4416        assert_item_labels(&pane, ["A!", "B!", "C*"], cx);
4417
4418        pane.update_in(cx, |pane, window, cx| {
4419            let ix = pane.index_for_item_id(item_c.item_id()).unwrap();
4420            pane.pin_tab_at(ix, window, cx);
4421        });
4422        assert_item_labels(&pane, ["A!", "B!", "C*!"], cx);
4423    }
4424
4425    #[gpui::test]
4426    async fn test_pin_tabs_right_to_left_after_opening_at_max_capacity(cx: &mut TestAppContext) {
4427        init_test(cx);
4428        let fs = FakeFs::new(cx.executor());
4429
4430        let project = Project::test(fs, None, cx).await;
4431        let (workspace, cx) =
4432            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
4433        let pane = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
4434
4435        set_max_tabs(cx, Some(3));
4436
4437        let item_a = add_labeled_item(&pane, "A", false, cx);
4438        assert_item_labels(&pane, ["A*"], cx);
4439
4440        let item_b = add_labeled_item(&pane, "B", false, cx);
4441        assert_item_labels(&pane, ["A", "B*"], cx);
4442
4443        let item_c = add_labeled_item(&pane, "C", false, cx);
4444        assert_item_labels(&pane, ["A", "B", "C*"], cx);
4445
4446        pane.update_in(cx, |pane, window, cx| {
4447            let ix = pane.index_for_item_id(item_c.item_id()).unwrap();
4448            pane.pin_tab_at(ix, window, cx);
4449        });
4450        assert_item_labels(&pane, ["C*!", "A", "B"], cx);
4451
4452        pane.update_in(cx, |pane, window, cx| {
4453            let ix = pane.index_for_item_id(item_b.item_id()).unwrap();
4454            pane.pin_tab_at(ix, window, cx);
4455        });
4456        assert_item_labels(&pane, ["C*!", "B!", "A"], cx);
4457
4458        pane.update_in(cx, |pane, window, cx| {
4459            let ix = pane.index_for_item_id(item_a.item_id()).unwrap();
4460            pane.pin_tab_at(ix, window, cx);
4461        });
4462        assert_item_labels(&pane, ["C*!", "B!", "A!"], cx);
4463    }
4464
4465    #[gpui::test]
4466    async fn test_pinned_tabs_never_closed_at_max_tabs(cx: &mut TestAppContext) {
4467        init_test(cx);
4468        let fs = FakeFs::new(cx.executor());
4469
4470        let project = Project::test(fs, None, cx).await;
4471        let (workspace, cx) =
4472            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
4473        let pane = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
4474
4475        let item_a = add_labeled_item(&pane, "A", false, cx);
4476        pane.update_in(cx, |pane, window, cx| {
4477            let ix = pane.index_for_item_id(item_a.item_id()).unwrap();
4478            pane.pin_tab_at(ix, window, cx);
4479        });
4480
4481        let item_b = add_labeled_item(&pane, "B", false, cx);
4482        pane.update_in(cx, |pane, window, cx| {
4483            let ix = pane.index_for_item_id(item_b.item_id()).unwrap();
4484            pane.pin_tab_at(ix, window, cx);
4485        });
4486
4487        add_labeled_item(&pane, "C", false, cx);
4488        add_labeled_item(&pane, "D", false, cx);
4489        add_labeled_item(&pane, "E", false, cx);
4490        assert_item_labels(&pane, ["A!", "B!", "C", "D", "E*"], cx);
4491
4492        set_max_tabs(cx, Some(3));
4493        add_labeled_item(&pane, "F", false, cx);
4494        assert_item_labels(&pane, ["A!", "B!", "F*"], cx);
4495
4496        add_labeled_item(&pane, "G", false, cx);
4497        assert_item_labels(&pane, ["A!", "B!", "G*"], cx);
4498
4499        add_labeled_item(&pane, "H", false, cx);
4500        assert_item_labels(&pane, ["A!", "B!", "H*"], cx);
4501    }
4502
4503    #[gpui::test]
4504    async fn test_always_allows_one_unpinned_item_over_max_tabs_regardless_of_pinned_count(
4505        cx: &mut TestAppContext,
4506    ) {
4507        init_test(cx);
4508        let fs = FakeFs::new(cx.executor());
4509
4510        let project = Project::test(fs, None, cx).await;
4511        let (workspace, cx) =
4512            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
4513        let pane = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
4514
4515        set_max_tabs(cx, Some(3));
4516
4517        let item_a = add_labeled_item(&pane, "A", false, cx);
4518        pane.update_in(cx, |pane, window, cx| {
4519            let ix = pane.index_for_item_id(item_a.item_id()).unwrap();
4520            pane.pin_tab_at(ix, window, cx);
4521        });
4522
4523        let item_b = add_labeled_item(&pane, "B", false, cx);
4524        pane.update_in(cx, |pane, window, cx| {
4525            let ix = pane.index_for_item_id(item_b.item_id()).unwrap();
4526            pane.pin_tab_at(ix, window, cx);
4527        });
4528
4529        let item_c = add_labeled_item(&pane, "C", false, cx);
4530        pane.update_in(cx, |pane, window, cx| {
4531            let ix = pane.index_for_item_id(item_c.item_id()).unwrap();
4532            pane.pin_tab_at(ix, window, cx);
4533        });
4534
4535        assert_item_labels(&pane, ["A!", "B!", "C*!"], cx);
4536
4537        let item_d = add_labeled_item(&pane, "D", false, cx);
4538        assert_item_labels(&pane, ["A!", "B!", "C!", "D*"], cx);
4539
4540        pane.update_in(cx, |pane, window, cx| {
4541            let ix = pane.index_for_item_id(item_d.item_id()).unwrap();
4542            pane.pin_tab_at(ix, window, cx);
4543        });
4544        assert_item_labels(&pane, ["A!", "B!", "C!", "D*!"], cx);
4545
4546        add_labeled_item(&pane, "E", false, cx);
4547        assert_item_labels(&pane, ["A!", "B!", "C!", "D!", "E*"], cx);
4548
4549        add_labeled_item(&pane, "F", false, cx);
4550        assert_item_labels(&pane, ["A!", "B!", "C!", "D!", "F*"], cx);
4551    }
4552
4553    #[gpui::test]
4554    async fn test_can_open_one_item_when_all_tabs_are_dirty_at_max(cx: &mut TestAppContext) {
4555        init_test(cx);
4556        let fs = FakeFs::new(cx.executor());
4557
4558        let project = Project::test(fs, None, cx).await;
4559        let (workspace, cx) =
4560            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
4561        let pane = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
4562
4563        set_max_tabs(cx, Some(3));
4564
4565        add_labeled_item(&pane, "A", true, cx);
4566        assert_item_labels(&pane, ["A*^"], cx);
4567
4568        add_labeled_item(&pane, "B", true, cx);
4569        assert_item_labels(&pane, ["A^", "B*^"], cx);
4570
4571        add_labeled_item(&pane, "C", true, cx);
4572        assert_item_labels(&pane, ["A^", "B^", "C*^"], cx);
4573
4574        add_labeled_item(&pane, "D", false, cx);
4575        assert_item_labels(&pane, ["A^", "B^", "C^", "D*"], cx);
4576
4577        add_labeled_item(&pane, "E", false, cx);
4578        assert_item_labels(&pane, ["A^", "B^", "C^", "E*"], cx);
4579
4580        add_labeled_item(&pane, "F", false, cx);
4581        assert_item_labels(&pane, ["A^", "B^", "C^", "F*"], cx);
4582
4583        add_labeled_item(&pane, "G", true, cx);
4584        assert_item_labels(&pane, ["A^", "B^", "C^", "G*^"], cx);
4585    }
4586
4587    #[gpui::test]
4588    async fn test_toggle_pin_tab(cx: &mut TestAppContext) {
4589        init_test(cx);
4590        let fs = FakeFs::new(cx.executor());
4591
4592        let project = Project::test(fs, None, cx).await;
4593        let (workspace, cx) =
4594            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
4595        let pane = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
4596
4597        set_labeled_items(&pane, ["A", "B*", "C"], cx);
4598        assert_item_labels(&pane, ["A", "B*", "C"], cx);
4599
4600        pane.update_in(cx, |pane, window, cx| {
4601            pane.toggle_pin_tab(&TogglePinTab, window, cx);
4602        });
4603        assert_item_labels(&pane, ["B*!", "A", "C"], cx);
4604
4605        pane.update_in(cx, |pane, window, cx| {
4606            pane.toggle_pin_tab(&TogglePinTab, window, cx);
4607        });
4608        assert_item_labels(&pane, ["B*", "A", "C"], cx);
4609    }
4610
4611    #[gpui::test]
4612    async fn test_unpin_all_tabs(cx: &mut TestAppContext) {
4613        init_test(cx);
4614        let fs = FakeFs::new(cx.executor());
4615
4616        let project = Project::test(fs, None, cx).await;
4617        let (workspace, cx) =
4618            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
4619        let pane = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
4620
4621        // Unpin all, in an empty pane
4622        pane.update_in(cx, |pane, window, cx| {
4623            pane.unpin_all_tabs(&UnpinAllTabs, window, cx);
4624        });
4625
4626        assert_item_labels(&pane, [], cx);
4627
4628        let item_a = add_labeled_item(&pane, "A", false, cx);
4629        let item_b = add_labeled_item(&pane, "B", false, cx);
4630        let item_c = add_labeled_item(&pane, "C", false, cx);
4631        assert_item_labels(&pane, ["A", "B", "C*"], cx);
4632
4633        // Unpin all, when no tabs are pinned
4634        pane.update_in(cx, |pane, window, cx| {
4635            pane.unpin_all_tabs(&UnpinAllTabs, window, cx);
4636        });
4637
4638        assert_item_labels(&pane, ["A", "B", "C*"], cx);
4639
4640        // Pin inactive tabs only
4641        pane.update_in(cx, |pane, window, cx| {
4642            let ix = pane.index_for_item_id(item_a.item_id()).unwrap();
4643            pane.pin_tab_at(ix, window, cx);
4644
4645            let ix = pane.index_for_item_id(item_b.item_id()).unwrap();
4646            pane.pin_tab_at(ix, window, cx);
4647        });
4648        assert_item_labels(&pane, ["A!", "B!", "C*"], cx);
4649
4650        pane.update_in(cx, |pane, window, cx| {
4651            pane.unpin_all_tabs(&UnpinAllTabs, window, cx);
4652        });
4653
4654        assert_item_labels(&pane, ["A", "B", "C*"], cx);
4655
4656        // Pin all tabs
4657        pane.update_in(cx, |pane, window, cx| {
4658            let ix = pane.index_for_item_id(item_a.item_id()).unwrap();
4659            pane.pin_tab_at(ix, window, cx);
4660
4661            let ix = pane.index_for_item_id(item_b.item_id()).unwrap();
4662            pane.pin_tab_at(ix, window, cx);
4663
4664            let ix = pane.index_for_item_id(item_c.item_id()).unwrap();
4665            pane.pin_tab_at(ix, window, cx);
4666        });
4667        assert_item_labels(&pane, ["A!", "B!", "C*!"], cx);
4668
4669        // Activate middle tab
4670        pane.update_in(cx, |pane, window, cx| {
4671            pane.activate_item(1, false, false, window, cx);
4672        });
4673        assert_item_labels(&pane, ["A!", "B*!", "C!"], cx);
4674
4675        pane.update_in(cx, |pane, window, cx| {
4676            pane.unpin_all_tabs(&UnpinAllTabs, window, cx);
4677        });
4678
4679        // Order has not changed
4680        assert_item_labels(&pane, ["A", "B*", "C"], cx);
4681    }
4682
4683    #[gpui::test]
4684    async fn test_pinning_active_tab_without_position_change_maintains_focus(
4685        cx: &mut TestAppContext,
4686    ) {
4687        init_test(cx);
4688        let fs = FakeFs::new(cx.executor());
4689
4690        let project = Project::test(fs, None, cx).await;
4691        let (workspace, cx) =
4692            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
4693        let pane = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
4694
4695        // Add A
4696        let item_a = add_labeled_item(&pane, "A", false, cx);
4697        assert_item_labels(&pane, ["A*"], cx);
4698
4699        // Add B
4700        add_labeled_item(&pane, "B", false, cx);
4701        assert_item_labels(&pane, ["A", "B*"], cx);
4702
4703        // Activate A again
4704        pane.update_in(cx, |pane, window, cx| {
4705            let ix = pane.index_for_item_id(item_a.item_id()).unwrap();
4706            pane.activate_item(ix, true, true, window, cx);
4707        });
4708        assert_item_labels(&pane, ["A*", "B"], cx);
4709
4710        // Pin A - remains active
4711        pane.update_in(cx, |pane, window, cx| {
4712            let ix = pane.index_for_item_id(item_a.item_id()).unwrap();
4713            pane.pin_tab_at(ix, window, cx);
4714        });
4715        assert_item_labels(&pane, ["A*!", "B"], cx);
4716
4717        // Unpin A - remain active
4718        pane.update_in(cx, |pane, window, cx| {
4719            let ix = pane.index_for_item_id(item_a.item_id()).unwrap();
4720            pane.unpin_tab_at(ix, window, cx);
4721        });
4722        assert_item_labels(&pane, ["A*", "B"], cx);
4723    }
4724
4725    #[gpui::test]
4726    async fn test_pinning_active_tab_with_position_change_maintains_focus(cx: &mut TestAppContext) {
4727        init_test(cx);
4728        let fs = FakeFs::new(cx.executor());
4729
4730        let project = Project::test(fs, None, cx).await;
4731        let (workspace, cx) =
4732            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
4733        let pane = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
4734
4735        // Add A, B, C
4736        add_labeled_item(&pane, "A", false, cx);
4737        add_labeled_item(&pane, "B", false, cx);
4738        let item_c = add_labeled_item(&pane, "C", false, cx);
4739        assert_item_labels(&pane, ["A", "B", "C*"], cx);
4740
4741        // Pin C - moves to pinned area, remains active
4742        pane.update_in(cx, |pane, window, cx| {
4743            let ix = pane.index_for_item_id(item_c.item_id()).unwrap();
4744            pane.pin_tab_at(ix, window, cx);
4745        });
4746        assert_item_labels(&pane, ["C*!", "A", "B"], cx);
4747
4748        // Unpin C - moves after pinned area, remains active
4749        pane.update_in(cx, |pane, window, cx| {
4750            let ix = pane.index_for_item_id(item_c.item_id()).unwrap();
4751            pane.unpin_tab_at(ix, window, cx);
4752        });
4753        assert_item_labels(&pane, ["C*", "A", "B"], cx);
4754    }
4755
4756    #[gpui::test]
4757    async fn test_pinning_inactive_tab_without_position_change_preserves_existing_focus(
4758        cx: &mut TestAppContext,
4759    ) {
4760        init_test(cx);
4761        let fs = FakeFs::new(cx.executor());
4762
4763        let project = Project::test(fs, None, cx).await;
4764        let (workspace, cx) =
4765            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
4766        let pane = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
4767
4768        // Add A, B
4769        let item_a = add_labeled_item(&pane, "A", false, cx);
4770        add_labeled_item(&pane, "B", false, cx);
4771        assert_item_labels(&pane, ["A", "B*"], cx);
4772
4773        // Pin A - already in pinned area, B remains active
4774        pane.update_in(cx, |pane, window, cx| {
4775            let ix = pane.index_for_item_id(item_a.item_id()).unwrap();
4776            pane.pin_tab_at(ix, window, cx);
4777        });
4778        assert_item_labels(&pane, ["A!", "B*"], cx);
4779
4780        // Unpin A - stays in place, B remains active
4781        pane.update_in(cx, |pane, window, cx| {
4782            let ix = pane.index_for_item_id(item_a.item_id()).unwrap();
4783            pane.unpin_tab_at(ix, window, cx);
4784        });
4785        assert_item_labels(&pane, ["A", "B*"], cx);
4786    }
4787
4788    #[gpui::test]
4789    async fn test_pinning_inactive_tab_with_position_change_preserves_existing_focus(
4790        cx: &mut TestAppContext,
4791    ) {
4792        init_test(cx);
4793        let fs = FakeFs::new(cx.executor());
4794
4795        let project = Project::test(fs, None, cx).await;
4796        let (workspace, cx) =
4797            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
4798        let pane = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
4799
4800        // Add A, B, C
4801        add_labeled_item(&pane, "A", false, cx);
4802        let item_b = add_labeled_item(&pane, "B", false, cx);
4803        let item_c = add_labeled_item(&pane, "C", false, cx);
4804        assert_item_labels(&pane, ["A", "B", "C*"], cx);
4805
4806        // Activate B
4807        pane.update_in(cx, |pane, window, cx| {
4808            let ix = pane.index_for_item_id(item_b.item_id()).unwrap();
4809            pane.activate_item(ix, true, true, window, cx);
4810        });
4811        assert_item_labels(&pane, ["A", "B*", "C"], cx);
4812
4813        // Pin C - moves to pinned area, B remains active
4814        pane.update_in(cx, |pane, window, cx| {
4815            let ix = pane.index_for_item_id(item_c.item_id()).unwrap();
4816            pane.pin_tab_at(ix, window, cx);
4817        });
4818        assert_item_labels(&pane, ["C!", "A", "B*"], cx);
4819
4820        // Unpin C - moves after pinned area, B remains active
4821        pane.update_in(cx, |pane, window, cx| {
4822            let ix = pane.index_for_item_id(item_c.item_id()).unwrap();
4823            pane.unpin_tab_at(ix, window, cx);
4824        });
4825        assert_item_labels(&pane, ["C", "A", "B*"], cx);
4826    }
4827
4828    #[gpui::test]
4829    async fn test_drag_unpinned_tab_to_split_creates_pane_with_unpinned_tab(
4830        cx: &mut TestAppContext,
4831    ) {
4832        init_test(cx);
4833        let fs = FakeFs::new(cx.executor());
4834
4835        let project = Project::test(fs, None, cx).await;
4836        let (workspace, cx) =
4837            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
4838        let pane_a = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
4839
4840        // Add A, B. Pin B. Activate A
4841        let item_a = add_labeled_item(&pane_a, "A", false, cx);
4842        let item_b = add_labeled_item(&pane_a, "B", false, cx);
4843
4844        pane_a.update_in(cx, |pane, window, cx| {
4845            let ix = pane.index_for_item_id(item_b.item_id()).unwrap();
4846            pane.pin_tab_at(ix, window, cx);
4847
4848            let ix = pane.index_for_item_id(item_a.item_id()).unwrap();
4849            pane.activate_item(ix, true, true, window, cx);
4850        });
4851
4852        // Drag A to create new split
4853        pane_a.update_in(cx, |pane, window, cx| {
4854            pane.drag_split_direction = Some(SplitDirection::Right);
4855
4856            let dragged_tab = DraggedTab {
4857                pane: pane_a.clone(),
4858                item: item_a.boxed_clone(),
4859                ix: 0,
4860                detail: 0,
4861                is_active: true,
4862            };
4863            pane.handle_tab_drop(&dragged_tab, 0, window, cx);
4864        });
4865
4866        // A should be moved to new pane. B should remain pinned, A should not be pinned
4867        let (pane_a, pane_b) = workspace.read_with(cx, |workspace, _| {
4868            let panes = workspace.panes();
4869            (panes[0].clone(), panes[1].clone())
4870        });
4871        assert_item_labels(&pane_a, ["B*!"], cx);
4872        assert_item_labels(&pane_b, ["A*"], cx);
4873    }
4874
4875    #[gpui::test]
4876    async fn test_drag_pinned_tab_to_split_creates_pane_with_pinned_tab(cx: &mut TestAppContext) {
4877        init_test(cx);
4878        let fs = FakeFs::new(cx.executor());
4879
4880        let project = Project::test(fs, None, cx).await;
4881        let (workspace, cx) =
4882            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
4883        let pane_a = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
4884
4885        // Add A, B. Pin both. Activate A
4886        let item_a = add_labeled_item(&pane_a, "A", false, cx);
4887        let item_b = add_labeled_item(&pane_a, "B", false, cx);
4888
4889        pane_a.update_in(cx, |pane, window, cx| {
4890            let ix = pane.index_for_item_id(item_a.item_id()).unwrap();
4891            pane.pin_tab_at(ix, window, cx);
4892
4893            let ix = pane.index_for_item_id(item_b.item_id()).unwrap();
4894            pane.pin_tab_at(ix, window, cx);
4895
4896            let ix = pane.index_for_item_id(item_a.item_id()).unwrap();
4897            pane.activate_item(ix, true, true, window, cx);
4898        });
4899        assert_item_labels(&pane_a, ["A*!", "B!"], cx);
4900
4901        // Drag A to create new split
4902        pane_a.update_in(cx, |pane, window, cx| {
4903            pane.drag_split_direction = Some(SplitDirection::Right);
4904
4905            let dragged_tab = DraggedTab {
4906                pane: pane_a.clone(),
4907                item: item_a.boxed_clone(),
4908                ix: 0,
4909                detail: 0,
4910                is_active: true,
4911            };
4912            pane.handle_tab_drop(&dragged_tab, 0, window, cx);
4913        });
4914
4915        // A should be moved to new pane. Both A and B should still be pinned
4916        let (pane_a, pane_b) = workspace.read_with(cx, |workspace, _| {
4917            let panes = workspace.panes();
4918            (panes[0].clone(), panes[1].clone())
4919        });
4920        assert_item_labels(&pane_a, ["B*!"], cx);
4921        assert_item_labels(&pane_b, ["A*!"], cx);
4922    }
4923
4924    #[gpui::test]
4925    async fn test_drag_pinned_tab_into_existing_panes_pinned_region(cx: &mut TestAppContext) {
4926        init_test(cx);
4927        let fs = FakeFs::new(cx.executor());
4928
4929        let project = Project::test(fs, None, cx).await;
4930        let (workspace, cx) =
4931            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
4932        let pane_a = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
4933
4934        // Add A to pane A and pin
4935        let item_a = add_labeled_item(&pane_a, "A", false, cx);
4936        pane_a.update_in(cx, |pane, window, cx| {
4937            let ix = pane.index_for_item_id(item_a.item_id()).unwrap();
4938            pane.pin_tab_at(ix, window, cx);
4939        });
4940        assert_item_labels(&pane_a, ["A*!"], cx);
4941
4942        // Add B to pane B and pin
4943        let pane_b = workspace.update_in(cx, |workspace, window, cx| {
4944            workspace.split_pane(pane_a.clone(), SplitDirection::Right, window, cx)
4945        });
4946        let item_b = add_labeled_item(&pane_b, "B", false, cx);
4947        pane_b.update_in(cx, |pane, window, cx| {
4948            let ix = pane.index_for_item_id(item_b.item_id()).unwrap();
4949            pane.pin_tab_at(ix, window, cx);
4950        });
4951        assert_item_labels(&pane_b, ["B*!"], cx);
4952
4953        // Move A from pane A to pane B's pinned region
4954        pane_b.update_in(cx, |pane, window, cx| {
4955            let dragged_tab = DraggedTab {
4956                pane: pane_a.clone(),
4957                item: item_a.boxed_clone(),
4958                ix: 0,
4959                detail: 0,
4960                is_active: true,
4961            };
4962            pane.handle_tab_drop(&dragged_tab, 0, window, cx);
4963        });
4964
4965        // A should stay pinned
4966        assert_item_labels(&pane_a, [], cx);
4967        assert_item_labels(&pane_b, ["A*!", "B!"], cx);
4968    }
4969
4970    #[gpui::test]
4971    async fn test_drag_pinned_tab_into_existing_panes_unpinned_region(cx: &mut TestAppContext) {
4972        init_test(cx);
4973        let fs = FakeFs::new(cx.executor());
4974
4975        let project = Project::test(fs, None, cx).await;
4976        let (workspace, cx) =
4977            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
4978        let pane_a = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
4979
4980        // Add A to pane A and pin
4981        let item_a = add_labeled_item(&pane_a, "A", false, cx);
4982        pane_a.update_in(cx, |pane, window, cx| {
4983            let ix = pane.index_for_item_id(item_a.item_id()).unwrap();
4984            pane.pin_tab_at(ix, window, cx);
4985        });
4986        assert_item_labels(&pane_a, ["A*!"], cx);
4987
4988        // Create pane B with pinned item B
4989        let pane_b = workspace.update_in(cx, |workspace, window, cx| {
4990            workspace.split_pane(pane_a.clone(), SplitDirection::Right, window, cx)
4991        });
4992        let item_b = add_labeled_item(&pane_b, "B", false, cx);
4993        assert_item_labels(&pane_b, ["B*"], cx);
4994
4995        pane_b.update_in(cx, |pane, window, cx| {
4996            let ix = pane.index_for_item_id(item_b.item_id()).unwrap();
4997            pane.pin_tab_at(ix, window, cx);
4998        });
4999        assert_item_labels(&pane_b, ["B*!"], cx);
5000
5001        // Move A from pane A to pane B's unpinned region
5002        pane_b.update_in(cx, |pane, window, cx| {
5003            let dragged_tab = DraggedTab {
5004                pane: pane_a.clone(),
5005                item: item_a.boxed_clone(),
5006                ix: 0,
5007                detail: 0,
5008                is_active: true,
5009            };
5010            pane.handle_tab_drop(&dragged_tab, 1, window, cx);
5011        });
5012
5013        // A should become pinned
5014        assert_item_labels(&pane_a, [], cx);
5015        assert_item_labels(&pane_b, ["B!", "A*"], cx);
5016    }
5017
5018    #[gpui::test]
5019    async fn test_drag_pinned_tab_into_existing_panes_first_position_with_no_pinned_tabs(
5020        cx: &mut TestAppContext,
5021    ) {
5022        init_test(cx);
5023        let fs = FakeFs::new(cx.executor());
5024
5025        let project = Project::test(fs, None, cx).await;
5026        let (workspace, cx) =
5027            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
5028        let pane_a = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
5029
5030        // Add A to pane A and pin
5031        let item_a = add_labeled_item(&pane_a, "A", false, cx);
5032        pane_a.update_in(cx, |pane, window, cx| {
5033            let ix = pane.index_for_item_id(item_a.item_id()).unwrap();
5034            pane.pin_tab_at(ix, window, cx);
5035        });
5036        assert_item_labels(&pane_a, ["A*!"], cx);
5037
5038        // Add B to pane B
5039        let pane_b = workspace.update_in(cx, |workspace, window, cx| {
5040            workspace.split_pane(pane_a.clone(), SplitDirection::Right, window, cx)
5041        });
5042        add_labeled_item(&pane_b, "B", false, cx);
5043        assert_item_labels(&pane_b, ["B*"], cx);
5044
5045        // Move A from pane A to position 0 in pane B, indicating it should stay pinned
5046        pane_b.update_in(cx, |pane, window, cx| {
5047            let dragged_tab = DraggedTab {
5048                pane: pane_a.clone(),
5049                item: item_a.boxed_clone(),
5050                ix: 0,
5051                detail: 0,
5052                is_active: true,
5053            };
5054            pane.handle_tab_drop(&dragged_tab, 0, window, cx);
5055        });
5056
5057        // A should stay pinned
5058        assert_item_labels(&pane_a, [], cx);
5059        assert_item_labels(&pane_b, ["A*!", "B"], cx);
5060    }
5061
5062    #[gpui::test]
5063    async fn test_drag_pinned_tab_into_existing_pane_at_max_capacity_closes_unpinned_tabs(
5064        cx: &mut TestAppContext,
5065    ) {
5066        init_test(cx);
5067        let fs = FakeFs::new(cx.executor());
5068
5069        let project = Project::test(fs, None, cx).await;
5070        let (workspace, cx) =
5071            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
5072        let pane_a = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
5073        set_max_tabs(cx, Some(2));
5074
5075        // Add A, B to pane A. Pin both
5076        let item_a = add_labeled_item(&pane_a, "A", false, cx);
5077        let item_b = add_labeled_item(&pane_a, "B", false, cx);
5078        pane_a.update_in(cx, |pane, window, cx| {
5079            let ix = pane.index_for_item_id(item_a.item_id()).unwrap();
5080            pane.pin_tab_at(ix, window, cx);
5081
5082            let ix = pane.index_for_item_id(item_b.item_id()).unwrap();
5083            pane.pin_tab_at(ix, window, cx);
5084        });
5085        assert_item_labels(&pane_a, ["A!", "B*!"], cx);
5086
5087        // Add C, D to pane B. Pin both
5088        let pane_b = workspace.update_in(cx, |workspace, window, cx| {
5089            workspace.split_pane(pane_a.clone(), SplitDirection::Right, window, cx)
5090        });
5091        let item_c = add_labeled_item(&pane_b, "C", false, cx);
5092        let item_d = add_labeled_item(&pane_b, "D", false, cx);
5093        pane_b.update_in(cx, |pane, window, cx| {
5094            let ix = pane.index_for_item_id(item_c.item_id()).unwrap();
5095            pane.pin_tab_at(ix, window, cx);
5096
5097            let ix = pane.index_for_item_id(item_d.item_id()).unwrap();
5098            pane.pin_tab_at(ix, window, cx);
5099        });
5100        assert_item_labels(&pane_b, ["C!", "D*!"], cx);
5101
5102        // Add a third unpinned item to pane B (exceeds max tabs), but is allowed,
5103        // as we allow 1 tab over max if the others are pinned or dirty
5104        add_labeled_item(&pane_b, "E", false, cx);
5105        assert_item_labels(&pane_b, ["C!", "D!", "E*"], cx);
5106
5107        // Drag pinned A from pane A to position 0 in pane B
5108        pane_b.update_in(cx, |pane, window, cx| {
5109            let dragged_tab = DraggedTab {
5110                pane: pane_a.clone(),
5111                item: item_a.boxed_clone(),
5112                ix: 0,
5113                detail: 0,
5114                is_active: true,
5115            };
5116            pane.handle_tab_drop(&dragged_tab, 0, window, cx);
5117        });
5118
5119        // E (unpinned) should be closed, leaving 3 pinned items
5120        assert_item_labels(&pane_a, ["B*!"], cx);
5121        assert_item_labels(&pane_b, ["A*!", "C!", "D!"], cx);
5122    }
5123
5124    #[gpui::test]
5125    async fn test_drag_last_pinned_tab_to_same_position_stays_pinned(cx: &mut TestAppContext) {
5126        init_test(cx);
5127        let fs = FakeFs::new(cx.executor());
5128
5129        let project = Project::test(fs, None, cx).await;
5130        let (workspace, cx) =
5131            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
5132        let pane_a = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
5133
5134        // Add A to pane A and pin it
5135        let item_a = add_labeled_item(&pane_a, "A", false, cx);
5136        pane_a.update_in(cx, |pane, window, cx| {
5137            let ix = pane.index_for_item_id(item_a.item_id()).unwrap();
5138            pane.pin_tab_at(ix, window, cx);
5139        });
5140        assert_item_labels(&pane_a, ["A*!"], cx);
5141
5142        // Drag pinned A to position 1 (directly to the right) in the same pane
5143        pane_a.update_in(cx, |pane, window, cx| {
5144            let dragged_tab = DraggedTab {
5145                pane: pane_a.clone(),
5146                item: item_a.boxed_clone(),
5147                ix: 0,
5148                detail: 0,
5149                is_active: true,
5150            };
5151            pane.handle_tab_drop(&dragged_tab, 1, window, cx);
5152        });
5153
5154        // A should still be pinned and active
5155        assert_item_labels(&pane_a, ["A*!"], cx);
5156    }
5157
5158    #[gpui::test]
5159    async fn test_drag_pinned_tab_beyond_last_pinned_tab_in_same_pane_stays_pinned(
5160        cx: &mut TestAppContext,
5161    ) {
5162        init_test(cx);
5163        let fs = FakeFs::new(cx.executor());
5164
5165        let project = Project::test(fs, None, cx).await;
5166        let (workspace, cx) =
5167            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
5168        let pane_a = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
5169
5170        // Add A, B to pane A and pin both
5171        let item_a = add_labeled_item(&pane_a, "A", false, cx);
5172        let item_b = add_labeled_item(&pane_a, "B", false, cx);
5173        pane_a.update_in(cx, |pane, window, cx| {
5174            let ix = pane.index_for_item_id(item_a.item_id()).unwrap();
5175            pane.pin_tab_at(ix, window, cx);
5176
5177            let ix = pane.index_for_item_id(item_b.item_id()).unwrap();
5178            pane.pin_tab_at(ix, window, cx);
5179        });
5180        assert_item_labels(&pane_a, ["A!", "B*!"], cx);
5181
5182        // Drag pinned A right of B in the same pane
5183        pane_a.update_in(cx, |pane, window, cx| {
5184            let dragged_tab = DraggedTab {
5185                pane: pane_a.clone(),
5186                item: item_a.boxed_clone(),
5187                ix: 0,
5188                detail: 0,
5189                is_active: true,
5190            };
5191            pane.handle_tab_drop(&dragged_tab, 2, window, cx);
5192        });
5193
5194        // A stays pinned
5195        assert_item_labels(&pane_a, ["B!", "A*!"], cx);
5196    }
5197
5198    #[gpui::test]
5199    async fn test_dragging_pinned_tab_onto_unpinned_tab_reduces_unpinned_tab_count(
5200        cx: &mut TestAppContext,
5201    ) {
5202        init_test(cx);
5203        let fs = FakeFs::new(cx.executor());
5204
5205        let project = Project::test(fs, None, cx).await;
5206        let (workspace, cx) =
5207            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
5208        let pane_a = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
5209
5210        // Add A, B to pane A and pin A
5211        let item_a = add_labeled_item(&pane_a, "A", false, cx);
5212        add_labeled_item(&pane_a, "B", false, cx);
5213        pane_a.update_in(cx, |pane, window, cx| {
5214            let ix = pane.index_for_item_id(item_a.item_id()).unwrap();
5215            pane.pin_tab_at(ix, window, cx);
5216        });
5217        assert_item_labels(&pane_a, ["A!", "B*"], cx);
5218
5219        // Drag pinned A on top of B in the same pane, which changes tab order to B, A
5220        pane_a.update_in(cx, |pane, window, cx| {
5221            let dragged_tab = DraggedTab {
5222                pane: pane_a.clone(),
5223                item: item_a.boxed_clone(),
5224                ix: 0,
5225                detail: 0,
5226                is_active: true,
5227            };
5228            pane.handle_tab_drop(&dragged_tab, 1, window, cx);
5229        });
5230
5231        // Neither are pinned
5232        assert_item_labels(&pane_a, ["B", "A*"], cx);
5233    }
5234
5235    #[gpui::test]
5236    async fn test_drag_pinned_tab_beyond_unpinned_tab_in_same_pane_becomes_unpinned(
5237        cx: &mut TestAppContext,
5238    ) {
5239        init_test(cx);
5240        let fs = FakeFs::new(cx.executor());
5241
5242        let project = Project::test(fs, None, cx).await;
5243        let (workspace, cx) =
5244            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
5245        let pane_a = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
5246
5247        // Add A, B to pane A and pin A
5248        let item_a = add_labeled_item(&pane_a, "A", false, cx);
5249        add_labeled_item(&pane_a, "B", false, cx);
5250        pane_a.update_in(cx, |pane, window, cx| {
5251            let ix = pane.index_for_item_id(item_a.item_id()).unwrap();
5252            pane.pin_tab_at(ix, window, cx);
5253        });
5254        assert_item_labels(&pane_a, ["A!", "B*"], cx);
5255
5256        // Drag pinned A right of B in the same pane
5257        pane_a.update_in(cx, |pane, window, cx| {
5258            let dragged_tab = DraggedTab {
5259                pane: pane_a.clone(),
5260                item: item_a.boxed_clone(),
5261                ix: 0,
5262                detail: 0,
5263                is_active: true,
5264            };
5265            pane.handle_tab_drop(&dragged_tab, 2, window, cx);
5266        });
5267
5268        // A becomes unpinned
5269        assert_item_labels(&pane_a, ["B", "A*"], cx);
5270    }
5271
5272    #[gpui::test]
5273    async fn test_drag_unpinned_tab_in_front_of_pinned_tab_in_same_pane_becomes_pinned(
5274        cx: &mut TestAppContext,
5275    ) {
5276        init_test(cx);
5277        let fs = FakeFs::new(cx.executor());
5278
5279        let project = Project::test(fs, None, cx).await;
5280        let (workspace, cx) =
5281            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
5282        let pane_a = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
5283
5284        // Add A, B to pane A and pin A
5285        let item_a = add_labeled_item(&pane_a, "A", false, cx);
5286        let item_b = add_labeled_item(&pane_a, "B", false, cx);
5287        pane_a.update_in(cx, |pane, window, cx| {
5288            let ix = pane.index_for_item_id(item_a.item_id()).unwrap();
5289            pane.pin_tab_at(ix, window, cx);
5290        });
5291        assert_item_labels(&pane_a, ["A!", "B*"], cx);
5292
5293        // Drag pinned B left of A in the same pane
5294        pane_a.update_in(cx, |pane, window, cx| {
5295            let dragged_tab = DraggedTab {
5296                pane: pane_a.clone(),
5297                item: item_b.boxed_clone(),
5298                ix: 1,
5299                detail: 0,
5300                is_active: true,
5301            };
5302            pane.handle_tab_drop(&dragged_tab, 0, window, cx);
5303        });
5304
5305        // A becomes unpinned
5306        assert_item_labels(&pane_a, ["B*!", "A!"], cx);
5307    }
5308
5309    #[gpui::test]
5310    async fn test_drag_unpinned_tab_to_the_pinned_region_stays_pinned(cx: &mut TestAppContext) {
5311        init_test(cx);
5312        let fs = FakeFs::new(cx.executor());
5313
5314        let project = Project::test(fs, None, cx).await;
5315        let (workspace, cx) =
5316            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
5317        let pane_a = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
5318
5319        // Add A, B, C to pane A and pin A
5320        let item_a = add_labeled_item(&pane_a, "A", false, cx);
5321        add_labeled_item(&pane_a, "B", false, cx);
5322        let item_c = add_labeled_item(&pane_a, "C", false, cx);
5323        pane_a.update_in(cx, |pane, window, cx| {
5324            let ix = pane.index_for_item_id(item_a.item_id()).unwrap();
5325            pane.pin_tab_at(ix, window, cx);
5326        });
5327        assert_item_labels(&pane_a, ["A!", "B", "C*"], cx);
5328
5329        // Drag pinned C left of B in the same pane
5330        pane_a.update_in(cx, |pane, window, cx| {
5331            let dragged_tab = DraggedTab {
5332                pane: pane_a.clone(),
5333                item: item_c.boxed_clone(),
5334                ix: 2,
5335                detail: 0,
5336                is_active: true,
5337            };
5338            pane.handle_tab_drop(&dragged_tab, 1, window, cx);
5339        });
5340
5341        // A stays pinned, B and C remain unpinned
5342        assert_item_labels(&pane_a, ["A!", "C*", "B"], cx);
5343    }
5344
5345    #[gpui::test]
5346    async fn test_drag_unpinned_tab_into_existing_panes_pinned_region(cx: &mut TestAppContext) {
5347        init_test(cx);
5348        let fs = FakeFs::new(cx.executor());
5349
5350        let project = Project::test(fs, None, cx).await;
5351        let (workspace, cx) =
5352            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
5353        let pane_a = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
5354
5355        // Add unpinned item A to pane A
5356        let item_a = add_labeled_item(&pane_a, "A", false, cx);
5357        assert_item_labels(&pane_a, ["A*"], cx);
5358
5359        // Create pane B with pinned item B
5360        let pane_b = workspace.update_in(cx, |workspace, window, cx| {
5361            workspace.split_pane(pane_a.clone(), SplitDirection::Right, window, cx)
5362        });
5363        let item_b = add_labeled_item(&pane_b, "B", false, cx);
5364        pane_b.update_in(cx, |pane, window, cx| {
5365            let ix = pane.index_for_item_id(item_b.item_id()).unwrap();
5366            pane.pin_tab_at(ix, window, cx);
5367        });
5368        assert_item_labels(&pane_b, ["B*!"], cx);
5369
5370        // Move A from pane A to pane B's pinned region
5371        pane_b.update_in(cx, |pane, window, cx| {
5372            let dragged_tab = DraggedTab {
5373                pane: pane_a.clone(),
5374                item: item_a.boxed_clone(),
5375                ix: 0,
5376                detail: 0,
5377                is_active: true,
5378            };
5379            pane.handle_tab_drop(&dragged_tab, 0, window, cx);
5380        });
5381
5382        // A should become pinned since it was dropped in the pinned region
5383        assert_item_labels(&pane_a, [], cx);
5384        assert_item_labels(&pane_b, ["A*!", "B!"], cx);
5385    }
5386
5387    #[gpui::test]
5388    async fn test_drag_unpinned_tab_into_existing_panes_unpinned_region(cx: &mut TestAppContext) {
5389        init_test(cx);
5390        let fs = FakeFs::new(cx.executor());
5391
5392        let project = Project::test(fs, None, cx).await;
5393        let (workspace, cx) =
5394            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
5395        let pane_a = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
5396
5397        // Add unpinned item A to pane A
5398        let item_a = add_labeled_item(&pane_a, "A", false, cx);
5399        assert_item_labels(&pane_a, ["A*"], cx);
5400
5401        // Create pane B with one pinned item B
5402        let pane_b = workspace.update_in(cx, |workspace, window, cx| {
5403            workspace.split_pane(pane_a.clone(), SplitDirection::Right, window, cx)
5404        });
5405        let item_b = add_labeled_item(&pane_b, "B", false, cx);
5406        pane_b.update_in(cx, |pane, window, cx| {
5407            let ix = pane.index_for_item_id(item_b.item_id()).unwrap();
5408            pane.pin_tab_at(ix, window, cx);
5409        });
5410        assert_item_labels(&pane_b, ["B*!"], cx);
5411
5412        // Move A from pane A to pane B's unpinned region
5413        pane_b.update_in(cx, |pane, window, cx| {
5414            let dragged_tab = DraggedTab {
5415                pane: pane_a.clone(),
5416                item: item_a.boxed_clone(),
5417                ix: 0,
5418                detail: 0,
5419                is_active: true,
5420            };
5421            pane.handle_tab_drop(&dragged_tab, 1, window, cx);
5422        });
5423
5424        // A should remain unpinned since it was dropped outside the pinned region
5425        assert_item_labels(&pane_a, [], cx);
5426        assert_item_labels(&pane_b, ["B!", "A*"], cx);
5427    }
5428
5429    #[gpui::test]
5430    async fn test_drag_pinned_tab_throughout_entire_range_of_pinned_tabs_both_directions(
5431        cx: &mut TestAppContext,
5432    ) {
5433        init_test(cx);
5434        let fs = FakeFs::new(cx.executor());
5435
5436        let project = Project::test(fs, None, cx).await;
5437        let (workspace, cx) =
5438            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
5439        let pane_a = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
5440
5441        // Add A, B, C and pin all
5442        let item_a = add_labeled_item(&pane_a, "A", false, cx);
5443        let item_b = add_labeled_item(&pane_a, "B", false, cx);
5444        let item_c = add_labeled_item(&pane_a, "C", false, cx);
5445        assert_item_labels(&pane_a, ["A", "B", "C*"], cx);
5446
5447        pane_a.update_in(cx, |pane, window, cx| {
5448            let ix = pane.index_for_item_id(item_a.item_id()).unwrap();
5449            pane.pin_tab_at(ix, window, cx);
5450
5451            let ix = pane.index_for_item_id(item_b.item_id()).unwrap();
5452            pane.pin_tab_at(ix, window, cx);
5453
5454            let ix = pane.index_for_item_id(item_c.item_id()).unwrap();
5455            pane.pin_tab_at(ix, window, cx);
5456        });
5457        assert_item_labels(&pane_a, ["A!", "B!", "C*!"], cx);
5458
5459        // Move A to right of B
5460        pane_a.update_in(cx, |pane, window, cx| {
5461            let dragged_tab = DraggedTab {
5462                pane: pane_a.clone(),
5463                item: item_a.boxed_clone(),
5464                ix: 0,
5465                detail: 0,
5466                is_active: true,
5467            };
5468            pane.handle_tab_drop(&dragged_tab, 1, window, cx);
5469        });
5470
5471        // A should be after B and all are pinned
5472        assert_item_labels(&pane_a, ["B!", "A*!", "C!"], cx);
5473
5474        // Move A to right of C
5475        pane_a.update_in(cx, |pane, window, cx| {
5476            let dragged_tab = DraggedTab {
5477                pane: pane_a.clone(),
5478                item: item_a.boxed_clone(),
5479                ix: 1,
5480                detail: 0,
5481                is_active: true,
5482            };
5483            pane.handle_tab_drop(&dragged_tab, 2, window, cx);
5484        });
5485
5486        // A should be after C and all are pinned
5487        assert_item_labels(&pane_a, ["B!", "C!", "A*!"], cx);
5488
5489        // Move A to left of C
5490        pane_a.update_in(cx, |pane, window, cx| {
5491            let dragged_tab = DraggedTab {
5492                pane: pane_a.clone(),
5493                item: item_a.boxed_clone(),
5494                ix: 2,
5495                detail: 0,
5496                is_active: true,
5497            };
5498            pane.handle_tab_drop(&dragged_tab, 1, window, cx);
5499        });
5500
5501        // A should be before C and all are pinned
5502        assert_item_labels(&pane_a, ["B!", "A*!", "C!"], cx);
5503
5504        // Move A to left of B
5505        pane_a.update_in(cx, |pane, window, cx| {
5506            let dragged_tab = DraggedTab {
5507                pane: pane_a.clone(),
5508                item: item_a.boxed_clone(),
5509                ix: 1,
5510                detail: 0,
5511                is_active: true,
5512            };
5513            pane.handle_tab_drop(&dragged_tab, 0, window, cx);
5514        });
5515
5516        // A should be before B and all are pinned
5517        assert_item_labels(&pane_a, ["A*!", "B!", "C!"], cx);
5518    }
5519
5520    #[gpui::test]
5521    async fn test_drag_first_tab_to_last_position(cx: &mut TestAppContext) {
5522        init_test(cx);
5523        let fs = FakeFs::new(cx.executor());
5524
5525        let project = Project::test(fs, None, cx).await;
5526        let (workspace, cx) =
5527            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
5528        let pane_a = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
5529
5530        // Add A, B, C
5531        let item_a = add_labeled_item(&pane_a, "A", false, cx);
5532        add_labeled_item(&pane_a, "B", false, cx);
5533        add_labeled_item(&pane_a, "C", false, cx);
5534        assert_item_labels(&pane_a, ["A", "B", "C*"], cx);
5535
5536        // Move A to the end
5537        pane_a.update_in(cx, |pane, window, cx| {
5538            let dragged_tab = DraggedTab {
5539                pane: pane_a.clone(),
5540                item: item_a.boxed_clone(),
5541                ix: 0,
5542                detail: 0,
5543                is_active: true,
5544            };
5545            pane.handle_tab_drop(&dragged_tab, 2, window, cx);
5546        });
5547
5548        // A should be at the end
5549        assert_item_labels(&pane_a, ["B", "C", "A*"], cx);
5550    }
5551
5552    #[gpui::test]
5553    async fn test_drag_last_tab_to_first_position(cx: &mut TestAppContext) {
5554        init_test(cx);
5555        let fs = FakeFs::new(cx.executor());
5556
5557        let project = Project::test(fs, None, cx).await;
5558        let (workspace, cx) =
5559            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
5560        let pane_a = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
5561
5562        // Add A, B, C
5563        add_labeled_item(&pane_a, "A", false, cx);
5564        add_labeled_item(&pane_a, "B", false, cx);
5565        let item_c = add_labeled_item(&pane_a, "C", false, cx);
5566        assert_item_labels(&pane_a, ["A", "B", "C*"], cx);
5567
5568        // Move C to the beginning
5569        pane_a.update_in(cx, |pane, window, cx| {
5570            let dragged_tab = DraggedTab {
5571                pane: pane_a.clone(),
5572                item: item_c.boxed_clone(),
5573                ix: 2,
5574                detail: 0,
5575                is_active: true,
5576            };
5577            pane.handle_tab_drop(&dragged_tab, 0, window, cx);
5578        });
5579
5580        // C should be at the beginning
5581        assert_item_labels(&pane_a, ["C*", "A", "B"], cx);
5582    }
5583
5584    #[gpui::test]
5585    async fn test_add_item_with_new_item(cx: &mut TestAppContext) {
5586        init_test(cx);
5587        let fs = FakeFs::new(cx.executor());
5588
5589        let project = Project::test(fs, None, cx).await;
5590        let (workspace, cx) =
5591            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
5592        let pane = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
5593
5594        // 1. Add with a destination index
5595        //   a. Add before the active item
5596        set_labeled_items(&pane, ["A", "B*", "C"], cx);
5597        pane.update_in(cx, |pane, window, cx| {
5598            pane.add_item(
5599                Box::new(cx.new(|cx| TestItem::new(cx).with_label("D"))),
5600                false,
5601                false,
5602                Some(0),
5603                window,
5604                cx,
5605            );
5606        });
5607        assert_item_labels(&pane, ["D*", "A", "B", "C"], cx);
5608
5609        //   b. Add after the active item
5610        set_labeled_items(&pane, ["A", "B*", "C"], cx);
5611        pane.update_in(cx, |pane, window, cx| {
5612            pane.add_item(
5613                Box::new(cx.new(|cx| TestItem::new(cx).with_label("D"))),
5614                false,
5615                false,
5616                Some(2),
5617                window,
5618                cx,
5619            );
5620        });
5621        assert_item_labels(&pane, ["A", "B", "D*", "C"], cx);
5622
5623        //   c. Add at the end of the item list (including off the length)
5624        set_labeled_items(&pane, ["A", "B*", "C"], cx);
5625        pane.update_in(cx, |pane, window, cx| {
5626            pane.add_item(
5627                Box::new(cx.new(|cx| TestItem::new(cx).with_label("D"))),
5628                false,
5629                false,
5630                Some(5),
5631                window,
5632                cx,
5633            );
5634        });
5635        assert_item_labels(&pane, ["A", "B", "C", "D*"], cx);
5636
5637        // 2. Add without a destination index
5638        //   a. Add with active item at the start of the item list
5639        set_labeled_items(&pane, ["A*", "B", "C"], cx);
5640        pane.update_in(cx, |pane, window, cx| {
5641            pane.add_item(
5642                Box::new(cx.new(|cx| TestItem::new(cx).with_label("D"))),
5643                false,
5644                false,
5645                None,
5646                window,
5647                cx,
5648            );
5649        });
5650        set_labeled_items(&pane, ["A", "D*", "B", "C"], cx);
5651
5652        //   b. Add with active item at the end of the item list
5653        set_labeled_items(&pane, ["A", "B", "C*"], cx);
5654        pane.update_in(cx, |pane, window, cx| {
5655            pane.add_item(
5656                Box::new(cx.new(|cx| TestItem::new(cx).with_label("D"))),
5657                false,
5658                false,
5659                None,
5660                window,
5661                cx,
5662            );
5663        });
5664        assert_item_labels(&pane, ["A", "B", "C", "D*"], cx);
5665    }
5666
5667    #[gpui::test]
5668    async fn test_add_item_with_existing_item(cx: &mut TestAppContext) {
5669        init_test(cx);
5670        let fs = FakeFs::new(cx.executor());
5671
5672        let project = Project::test(fs, None, cx).await;
5673        let (workspace, cx) =
5674            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
5675        let pane = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
5676
5677        // 1. Add with a destination index
5678        //   1a. Add before the active item
5679        let [_, _, _, d] = set_labeled_items(&pane, ["A", "B*", "C", "D"], cx);
5680        pane.update_in(cx, |pane, window, cx| {
5681            pane.add_item(d, false, false, Some(0), window, cx);
5682        });
5683        assert_item_labels(&pane, ["D*", "A", "B", "C"], cx);
5684
5685        //   1b. Add after the active item
5686        let [_, _, _, d] = set_labeled_items(&pane, ["A", "B*", "C", "D"], cx);
5687        pane.update_in(cx, |pane, window, cx| {
5688            pane.add_item(d, false, false, Some(2), window, cx);
5689        });
5690        assert_item_labels(&pane, ["A", "B", "D*", "C"], cx);
5691
5692        //   1c. Add at the end of the item list (including off the length)
5693        let [a, _, _, _] = set_labeled_items(&pane, ["A", "B*", "C", "D"], cx);
5694        pane.update_in(cx, |pane, window, cx| {
5695            pane.add_item(a, false, false, Some(5), window, cx);
5696        });
5697        assert_item_labels(&pane, ["B", "C", "D", "A*"], cx);
5698
5699        //   1d. Add same item to active index
5700        let [_, b, _] = set_labeled_items(&pane, ["A", "B*", "C"], cx);
5701        pane.update_in(cx, |pane, window, cx| {
5702            pane.add_item(b, false, false, Some(1), window, cx);
5703        });
5704        assert_item_labels(&pane, ["A", "B*", "C"], cx);
5705
5706        //   1e. Add item to index after same item in last position
5707        let [_, _, c] = set_labeled_items(&pane, ["A", "B*", "C"], cx);
5708        pane.update_in(cx, |pane, window, cx| {
5709            pane.add_item(c, false, false, Some(2), window, cx);
5710        });
5711        assert_item_labels(&pane, ["A", "B", "C*"], cx);
5712
5713        // 2. Add without a destination index
5714        //   2a. Add with active item at the start of the item list
5715        let [_, _, _, d] = set_labeled_items(&pane, ["A*", "B", "C", "D"], cx);
5716        pane.update_in(cx, |pane, window, cx| {
5717            pane.add_item(d, false, false, None, window, cx);
5718        });
5719        assert_item_labels(&pane, ["A", "D*", "B", "C"], cx);
5720
5721        //   2b. Add with active item at the end of the item list
5722        let [a, _, _, _] = set_labeled_items(&pane, ["A", "B", "C", "D*"], cx);
5723        pane.update_in(cx, |pane, window, cx| {
5724            pane.add_item(a, false, false, None, window, cx);
5725        });
5726        assert_item_labels(&pane, ["B", "C", "D", "A*"], cx);
5727
5728        //   2c. Add active item to active item at end of list
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, None, window, cx);
5732        });
5733        assert_item_labels(&pane, ["A", "B", "C*"], cx);
5734
5735        //   2d. Add active item to active item at start of list
5736        let [a, _, _] = set_labeled_items(&pane, ["A*", "B", "C"], cx);
5737        pane.update_in(cx, |pane, window, cx| {
5738            pane.add_item(a, false, false, None, window, cx);
5739        });
5740        assert_item_labels(&pane, ["A*", "B", "C"], cx);
5741    }
5742
5743    #[gpui::test]
5744    async fn test_add_item_with_same_project_entries(cx: &mut TestAppContext) {
5745        init_test(cx);
5746        let fs = FakeFs::new(cx.executor());
5747
5748        let project = Project::test(fs, None, cx).await;
5749        let (workspace, cx) =
5750            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
5751        let pane = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
5752
5753        // singleton view
5754        pane.update_in(cx, |pane, window, cx| {
5755            pane.add_item(
5756                Box::new(cx.new(|cx| {
5757                    TestItem::new(cx)
5758                        .with_buffer_kind(ItemBufferKind::Singleton)
5759                        .with_label("buffer 1")
5760                        .with_project_items(&[TestProjectItem::new(1, "one.txt", cx)])
5761                })),
5762                false,
5763                false,
5764                None,
5765                window,
5766                cx,
5767            );
5768        });
5769        assert_item_labels(&pane, ["buffer 1*"], cx);
5770
5771        // new singleton view with the same project entry
5772        pane.update_in(cx, |pane, window, cx| {
5773            pane.add_item(
5774                Box::new(cx.new(|cx| {
5775                    TestItem::new(cx)
5776                        .with_buffer_kind(ItemBufferKind::Singleton)
5777                        .with_label("buffer 1")
5778                        .with_project_items(&[TestProjectItem::new(1, "1.txt", cx)])
5779                })),
5780                false,
5781                false,
5782                None,
5783                window,
5784                cx,
5785            );
5786        });
5787        assert_item_labels(&pane, ["buffer 1*"], cx);
5788
5789        // new singleton view with different project entry
5790        pane.update_in(cx, |pane, window, cx| {
5791            pane.add_item(
5792                Box::new(cx.new(|cx| {
5793                    TestItem::new(cx)
5794                        .with_buffer_kind(ItemBufferKind::Singleton)
5795                        .with_label("buffer 2")
5796                        .with_project_items(&[TestProjectItem::new(2, "2.txt", cx)])
5797                })),
5798                false,
5799                false,
5800                None,
5801                window,
5802                cx,
5803            );
5804        });
5805        assert_item_labels(&pane, ["buffer 1", "buffer 2*"], cx);
5806
5807        // new multibuffer view with the same project entry
5808        pane.update_in(cx, |pane, window, cx| {
5809            pane.add_item(
5810                Box::new(cx.new(|cx| {
5811                    TestItem::new(cx)
5812                        .with_buffer_kind(ItemBufferKind::Multibuffer)
5813                        .with_label("multibuffer 1")
5814                        .with_project_items(&[TestProjectItem::new(1, "1.txt", cx)])
5815                })),
5816                false,
5817                false,
5818                None,
5819                window,
5820                cx,
5821            );
5822        });
5823        assert_item_labels(&pane, ["buffer 1", "buffer 2", "multibuffer 1*"], cx);
5824
5825        // another multibuffer view with the same project entry
5826        pane.update_in(cx, |pane, window, cx| {
5827            pane.add_item(
5828                Box::new(cx.new(|cx| {
5829                    TestItem::new(cx)
5830                        .with_buffer_kind(ItemBufferKind::Multibuffer)
5831                        .with_label("multibuffer 1b")
5832                        .with_project_items(&[TestProjectItem::new(1, "1.txt", cx)])
5833                })),
5834                false,
5835                false,
5836                None,
5837                window,
5838                cx,
5839            );
5840        });
5841        assert_item_labels(
5842            &pane,
5843            ["buffer 1", "buffer 2", "multibuffer 1", "multibuffer 1b*"],
5844            cx,
5845        );
5846    }
5847
5848    #[gpui::test]
5849    async fn test_remove_item_ordering_history(cx: &mut TestAppContext) {
5850        init_test(cx);
5851        let fs = FakeFs::new(cx.executor());
5852
5853        let project = Project::test(fs, None, cx).await;
5854        let (workspace, cx) =
5855            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
5856        let pane = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
5857
5858        add_labeled_item(&pane, "A", false, cx);
5859        add_labeled_item(&pane, "B", false, cx);
5860        add_labeled_item(&pane, "C", false, cx);
5861        add_labeled_item(&pane, "D", false, cx);
5862        assert_item_labels(&pane, ["A", "B", "C", "D*"], cx);
5863
5864        pane.update_in(cx, |pane, window, cx| {
5865            pane.activate_item(1, false, false, window, cx)
5866        });
5867        add_labeled_item(&pane, "1", false, cx);
5868        assert_item_labels(&pane, ["A", "B", "1*", "C", "D"], cx);
5869
5870        pane.update_in(cx, |pane, window, cx| {
5871            pane.close_active_item(
5872                &CloseActiveItem {
5873                    save_intent: None,
5874                    close_pinned: false,
5875                },
5876                window,
5877                cx,
5878            )
5879        })
5880        .await
5881        .unwrap();
5882        assert_item_labels(&pane, ["A", "B*", "C", "D"], cx);
5883
5884        pane.update_in(cx, |pane, window, cx| {
5885            pane.activate_item(3, false, false, window, cx)
5886        });
5887        assert_item_labels(&pane, ["A", "B", "C", "D*"], cx);
5888
5889        pane.update_in(cx, |pane, window, cx| {
5890            pane.close_active_item(
5891                &CloseActiveItem {
5892                    save_intent: None,
5893                    close_pinned: false,
5894                },
5895                window,
5896                cx,
5897            )
5898        })
5899        .await
5900        .unwrap();
5901        assert_item_labels(&pane, ["A", "B*", "C"], cx);
5902
5903        pane.update_in(cx, |pane, window, cx| {
5904            pane.close_active_item(
5905                &CloseActiveItem {
5906                    save_intent: None,
5907                    close_pinned: false,
5908                },
5909                window,
5910                cx,
5911            )
5912        })
5913        .await
5914        .unwrap();
5915        assert_item_labels(&pane, ["A", "C*"], cx);
5916
5917        pane.update_in(cx, |pane, window, cx| {
5918            pane.close_active_item(
5919                &CloseActiveItem {
5920                    save_intent: None,
5921                    close_pinned: false,
5922                },
5923                window,
5924                cx,
5925            )
5926        })
5927        .await
5928        .unwrap();
5929        assert_item_labels(&pane, ["A*"], cx);
5930    }
5931
5932    #[gpui::test]
5933    async fn test_remove_item_ordering_neighbour(cx: &mut TestAppContext) {
5934        init_test(cx);
5935        cx.update_global::<SettingsStore, ()>(|s, cx| {
5936            s.update_user_settings(cx, |s| {
5937                s.tabs.get_or_insert_default().activate_on_close = Some(ActivateOnClose::Neighbour);
5938            });
5939        });
5940        let fs = FakeFs::new(cx.executor());
5941
5942        let project = Project::test(fs, None, cx).await;
5943        let (workspace, cx) =
5944            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
5945        let pane = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
5946
5947        add_labeled_item(&pane, "A", false, cx);
5948        add_labeled_item(&pane, "B", false, cx);
5949        add_labeled_item(&pane, "C", false, cx);
5950        add_labeled_item(&pane, "D", false, cx);
5951        assert_item_labels(&pane, ["A", "B", "C", "D*"], cx);
5952
5953        pane.update_in(cx, |pane, window, cx| {
5954            pane.activate_item(1, false, false, window, cx)
5955        });
5956        add_labeled_item(&pane, "1", false, cx);
5957        assert_item_labels(&pane, ["A", "B", "1*", "C", "D"], cx);
5958
5959        pane.update_in(cx, |pane, window, cx| {
5960            pane.close_active_item(
5961                &CloseActiveItem {
5962                    save_intent: None,
5963                    close_pinned: false,
5964                },
5965                window,
5966                cx,
5967            )
5968        })
5969        .await
5970        .unwrap();
5971        assert_item_labels(&pane, ["A", "B", "C*", "D"], cx);
5972
5973        pane.update_in(cx, |pane, window, cx| {
5974            pane.activate_item(3, false, false, window, cx)
5975        });
5976        assert_item_labels(&pane, ["A", "B", "C", "D*"], cx);
5977
5978        pane.update_in(cx, |pane, window, cx| {
5979            pane.close_active_item(
5980                &CloseActiveItem {
5981                    save_intent: None,
5982                    close_pinned: false,
5983                },
5984                window,
5985                cx,
5986            )
5987        })
5988        .await
5989        .unwrap();
5990        assert_item_labels(&pane, ["A", "B", "C*"], cx);
5991
5992        pane.update_in(cx, |pane, window, cx| {
5993            pane.close_active_item(
5994                &CloseActiveItem {
5995                    save_intent: None,
5996                    close_pinned: false,
5997                },
5998                window,
5999                cx,
6000            )
6001        })
6002        .await
6003        .unwrap();
6004        assert_item_labels(&pane, ["A", "B*"], cx);
6005
6006        pane.update_in(cx, |pane, window, cx| {
6007            pane.close_active_item(
6008                &CloseActiveItem {
6009                    save_intent: None,
6010                    close_pinned: false,
6011                },
6012                window,
6013                cx,
6014            )
6015        })
6016        .await
6017        .unwrap();
6018        assert_item_labels(&pane, ["A*"], cx);
6019    }
6020
6021    #[gpui::test]
6022    async fn test_remove_item_ordering_left_neighbour(cx: &mut TestAppContext) {
6023        init_test(cx);
6024        cx.update_global::<SettingsStore, ()>(|s, cx| {
6025            s.update_user_settings(cx, |s| {
6026                s.tabs.get_or_insert_default().activate_on_close =
6027                    Some(ActivateOnClose::LeftNeighbour);
6028            });
6029        });
6030        let fs = FakeFs::new(cx.executor());
6031
6032        let project = Project::test(fs, None, cx).await;
6033        let (workspace, cx) =
6034            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
6035        let pane = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
6036
6037        add_labeled_item(&pane, "A", false, cx);
6038        add_labeled_item(&pane, "B", false, cx);
6039        add_labeled_item(&pane, "C", false, cx);
6040        add_labeled_item(&pane, "D", false, cx);
6041        assert_item_labels(&pane, ["A", "B", "C", "D*"], cx);
6042
6043        pane.update_in(cx, |pane, window, cx| {
6044            pane.activate_item(1, false, false, window, cx)
6045        });
6046        add_labeled_item(&pane, "1", false, cx);
6047        assert_item_labels(&pane, ["A", "B", "1*", "C", "D"], cx);
6048
6049        pane.update_in(cx, |pane, window, cx| {
6050            pane.close_active_item(
6051                &CloseActiveItem {
6052                    save_intent: None,
6053                    close_pinned: false,
6054                },
6055                window,
6056                cx,
6057            )
6058        })
6059        .await
6060        .unwrap();
6061        assert_item_labels(&pane, ["A", "B*", "C", "D"], cx);
6062
6063        pane.update_in(cx, |pane, window, cx| {
6064            pane.activate_item(3, false, false, window, cx)
6065        });
6066        assert_item_labels(&pane, ["A", "B", "C", "D*"], cx);
6067
6068        pane.update_in(cx, |pane, window, cx| {
6069            pane.close_active_item(
6070                &CloseActiveItem {
6071                    save_intent: None,
6072                    close_pinned: false,
6073                },
6074                window,
6075                cx,
6076            )
6077        })
6078        .await
6079        .unwrap();
6080        assert_item_labels(&pane, ["A", "B", "C*"], cx);
6081
6082        pane.update_in(cx, |pane, window, cx| {
6083            pane.activate_item(0, false, false, window, cx)
6084        });
6085        assert_item_labels(&pane, ["A*", "B", "C"], cx);
6086
6087        pane.update_in(cx, |pane, window, cx| {
6088            pane.close_active_item(
6089                &CloseActiveItem {
6090                    save_intent: None,
6091                    close_pinned: false,
6092                },
6093                window,
6094                cx,
6095            )
6096        })
6097        .await
6098        .unwrap();
6099        assert_item_labels(&pane, ["B*", "C"], cx);
6100
6101        pane.update_in(cx, |pane, window, cx| {
6102            pane.close_active_item(
6103                &CloseActiveItem {
6104                    save_intent: None,
6105                    close_pinned: false,
6106                },
6107                window,
6108                cx,
6109            )
6110        })
6111        .await
6112        .unwrap();
6113        assert_item_labels(&pane, ["C*"], cx);
6114    }
6115
6116    #[gpui::test]
6117    async fn test_close_inactive_items(cx: &mut TestAppContext) {
6118        init_test(cx);
6119        let fs = FakeFs::new(cx.executor());
6120
6121        let project = Project::test(fs, None, cx).await;
6122        let (workspace, cx) =
6123            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
6124        let pane = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
6125
6126        let item_a = add_labeled_item(&pane, "A", false, cx);
6127        pane.update_in(cx, |pane, window, cx| {
6128            let ix = pane.index_for_item_id(item_a.item_id()).unwrap();
6129            pane.pin_tab_at(ix, window, cx);
6130        });
6131        assert_item_labels(&pane, ["A*!"], cx);
6132
6133        let item_b = add_labeled_item(&pane, "B", false, cx);
6134        pane.update_in(cx, |pane, window, cx| {
6135            let ix = pane.index_for_item_id(item_b.item_id()).unwrap();
6136            pane.pin_tab_at(ix, window, cx);
6137        });
6138        assert_item_labels(&pane, ["A!", "B*!"], cx);
6139
6140        add_labeled_item(&pane, "C", false, cx);
6141        assert_item_labels(&pane, ["A!", "B!", "C*"], cx);
6142
6143        add_labeled_item(&pane, "D", false, cx);
6144        add_labeled_item(&pane, "E", false, cx);
6145        assert_item_labels(&pane, ["A!", "B!", "C", "D", "E*"], cx);
6146
6147        pane.update_in(cx, |pane, window, cx| {
6148            pane.close_other_items(
6149                &CloseOtherItems {
6150                    save_intent: None,
6151                    close_pinned: false,
6152                },
6153                None,
6154                window,
6155                cx,
6156            )
6157        })
6158        .await
6159        .unwrap();
6160        assert_item_labels(&pane, ["A!", "B!", "E*"], cx);
6161    }
6162
6163    #[gpui::test]
6164    async fn test_running_close_inactive_items_via_an_inactive_item(cx: &mut TestAppContext) {
6165        init_test(cx);
6166        let fs = FakeFs::new(cx.executor());
6167
6168        let project = Project::test(fs, None, cx).await;
6169        let (workspace, cx) =
6170            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
6171        let pane = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
6172
6173        add_labeled_item(&pane, "A", false, cx);
6174        assert_item_labels(&pane, ["A*"], cx);
6175
6176        let item_b = add_labeled_item(&pane, "B", false, cx);
6177        assert_item_labels(&pane, ["A", "B*"], cx);
6178
6179        add_labeled_item(&pane, "C", false, cx);
6180        add_labeled_item(&pane, "D", false, cx);
6181        add_labeled_item(&pane, "E", false, cx);
6182        assert_item_labels(&pane, ["A", "B", "C", "D", "E*"], cx);
6183
6184        pane.update_in(cx, |pane, window, cx| {
6185            pane.close_other_items(
6186                &CloseOtherItems {
6187                    save_intent: None,
6188                    close_pinned: false,
6189                },
6190                Some(item_b.item_id()),
6191                window,
6192                cx,
6193            )
6194        })
6195        .await
6196        .unwrap();
6197        assert_item_labels(&pane, ["B*"], cx);
6198    }
6199
6200    #[gpui::test]
6201    async fn test_close_clean_items(cx: &mut TestAppContext) {
6202        init_test(cx);
6203        let fs = FakeFs::new(cx.executor());
6204
6205        let project = Project::test(fs, None, cx).await;
6206        let (workspace, cx) =
6207            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
6208        let pane = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
6209
6210        add_labeled_item(&pane, "A", true, cx);
6211        add_labeled_item(&pane, "B", false, cx);
6212        add_labeled_item(&pane, "C", true, cx);
6213        add_labeled_item(&pane, "D", false, cx);
6214        add_labeled_item(&pane, "E", false, cx);
6215        assert_item_labels(&pane, ["A^", "B", "C^", "D", "E*"], cx);
6216
6217        pane.update_in(cx, |pane, window, cx| {
6218            pane.close_clean_items(
6219                &CloseCleanItems {
6220                    close_pinned: false,
6221                },
6222                window,
6223                cx,
6224            )
6225        })
6226        .await
6227        .unwrap();
6228        assert_item_labels(&pane, ["A^", "C*^"], cx);
6229    }
6230
6231    #[gpui::test]
6232    async fn test_close_items_to_the_left(cx: &mut TestAppContext) {
6233        init_test(cx);
6234        let fs = FakeFs::new(cx.executor());
6235
6236        let project = Project::test(fs, None, cx).await;
6237        let (workspace, cx) =
6238            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
6239        let pane = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
6240
6241        set_labeled_items(&pane, ["A", "B", "C*", "D", "E"], cx);
6242
6243        pane.update_in(cx, |pane, window, cx| {
6244            pane.close_items_to_the_left_by_id(
6245                None,
6246                &CloseItemsToTheLeft {
6247                    close_pinned: false,
6248                },
6249                window,
6250                cx,
6251            )
6252        })
6253        .await
6254        .unwrap();
6255        assert_item_labels(&pane, ["C*", "D", "E"], cx);
6256    }
6257
6258    #[gpui::test]
6259    async fn test_close_items_to_the_right(cx: &mut TestAppContext) {
6260        init_test(cx);
6261        let fs = FakeFs::new(cx.executor());
6262
6263        let project = Project::test(fs, None, cx).await;
6264        let (workspace, cx) =
6265            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
6266        let pane = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
6267
6268        set_labeled_items(&pane, ["A", "B", "C*", "D", "E"], cx);
6269
6270        pane.update_in(cx, |pane, window, cx| {
6271            pane.close_items_to_the_right_by_id(
6272                None,
6273                &CloseItemsToTheRight {
6274                    close_pinned: false,
6275                },
6276                window,
6277                cx,
6278            )
6279        })
6280        .await
6281        .unwrap();
6282        assert_item_labels(&pane, ["A", "B", "C*"], cx);
6283    }
6284
6285    #[gpui::test]
6286    async fn test_close_all_items(cx: &mut TestAppContext) {
6287        init_test(cx);
6288        let fs = FakeFs::new(cx.executor());
6289
6290        let project = Project::test(fs, None, cx).await;
6291        let (workspace, cx) =
6292            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
6293        let pane = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
6294
6295        let item_a = add_labeled_item(&pane, "A", false, cx);
6296        add_labeled_item(&pane, "B", false, cx);
6297        add_labeled_item(&pane, "C", false, cx);
6298        assert_item_labels(&pane, ["A", "B", "C*"], cx);
6299
6300        pane.update_in(cx, |pane, window, cx| {
6301            let ix = pane.index_for_item_id(item_a.item_id()).unwrap();
6302            pane.pin_tab_at(ix, window, cx);
6303            pane.close_all_items(
6304                &CloseAllItems {
6305                    save_intent: None,
6306                    close_pinned: false,
6307                },
6308                window,
6309                cx,
6310            )
6311        })
6312        .await
6313        .unwrap();
6314        assert_item_labels(&pane, ["A*!"], cx);
6315
6316        pane.update_in(cx, |pane, window, cx| {
6317            let ix = pane.index_for_item_id(item_a.item_id()).unwrap();
6318            pane.unpin_tab_at(ix, window, cx);
6319            pane.close_all_items(
6320                &CloseAllItems {
6321                    save_intent: None,
6322                    close_pinned: false,
6323                },
6324                window,
6325                cx,
6326            )
6327        })
6328        .await
6329        .unwrap();
6330
6331        assert_item_labels(&pane, [], cx);
6332
6333        add_labeled_item(&pane, "A", true, cx).update(cx, |item, cx| {
6334            item.project_items
6335                .push(TestProjectItem::new_dirty(1, "A.txt", cx))
6336        });
6337        add_labeled_item(&pane, "B", true, cx).update(cx, |item, cx| {
6338            item.project_items
6339                .push(TestProjectItem::new_dirty(2, "B.txt", cx))
6340        });
6341        add_labeled_item(&pane, "C", true, cx).update(cx, |item, cx| {
6342            item.project_items
6343                .push(TestProjectItem::new_dirty(3, "C.txt", cx))
6344        });
6345        assert_item_labels(&pane, ["A^", "B^", "C*^"], cx);
6346
6347        let save = pane.update_in(cx, |pane, window, cx| {
6348            pane.close_all_items(
6349                &CloseAllItems {
6350                    save_intent: None,
6351                    close_pinned: false,
6352                },
6353                window,
6354                cx,
6355            )
6356        });
6357
6358        cx.executor().run_until_parked();
6359        cx.simulate_prompt_answer("Save all");
6360        save.await.unwrap();
6361        assert_item_labels(&pane, [], cx);
6362
6363        add_labeled_item(&pane, "A", true, cx);
6364        add_labeled_item(&pane, "B", true, cx);
6365        add_labeled_item(&pane, "C", true, cx);
6366        assert_item_labels(&pane, ["A^", "B^", "C*^"], cx);
6367        let save = pane.update_in(cx, |pane, window, cx| {
6368            pane.close_all_items(
6369                &CloseAllItems {
6370                    save_intent: None,
6371                    close_pinned: false,
6372                },
6373                window,
6374                cx,
6375            )
6376        });
6377
6378        cx.executor().run_until_parked();
6379        cx.simulate_prompt_answer("Discard all");
6380        save.await.unwrap();
6381        assert_item_labels(&pane, [], cx);
6382    }
6383
6384    #[gpui::test]
6385    async fn test_close_multibuffer_items(cx: &mut TestAppContext) {
6386        init_test(cx);
6387        let fs = FakeFs::new(cx.executor());
6388
6389        let project = Project::test(fs, None, cx).await;
6390        let (workspace, cx) =
6391            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
6392        let pane = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
6393
6394        let add_labeled_item = |pane: &Entity<Pane>,
6395                                label,
6396                                is_dirty,
6397                                kind: ItemBufferKind,
6398                                cx: &mut VisualTestContext| {
6399            pane.update_in(cx, |pane, window, cx| {
6400                let labeled_item = Box::new(cx.new(|cx| {
6401                    TestItem::new(cx)
6402                        .with_label(label)
6403                        .with_dirty(is_dirty)
6404                        .with_buffer_kind(kind)
6405                }));
6406                pane.add_item(labeled_item.clone(), false, false, None, window, cx);
6407                labeled_item
6408            })
6409        };
6410
6411        let item_a = add_labeled_item(&pane, "A", false, ItemBufferKind::Multibuffer, cx);
6412        add_labeled_item(&pane, "B", false, ItemBufferKind::Multibuffer, cx);
6413        add_labeled_item(&pane, "C", false, ItemBufferKind::Singleton, cx);
6414        assert_item_labels(&pane, ["A", "B", "C*"], cx);
6415
6416        pane.update_in(cx, |pane, window, cx| {
6417            let ix = pane.index_for_item_id(item_a.item_id()).unwrap();
6418            pane.pin_tab_at(ix, window, cx);
6419            pane.close_multibuffer_items(
6420                &CloseMultibufferItems {
6421                    save_intent: None,
6422                    close_pinned: false,
6423                },
6424                window,
6425                cx,
6426            )
6427        })
6428        .await
6429        .unwrap();
6430        assert_item_labels(&pane, ["A!", "C*"], cx);
6431
6432        pane.update_in(cx, |pane, window, cx| {
6433            let ix = pane.index_for_item_id(item_a.item_id()).unwrap();
6434            pane.unpin_tab_at(ix, window, cx);
6435            pane.close_multibuffer_items(
6436                &CloseMultibufferItems {
6437                    save_intent: None,
6438                    close_pinned: false,
6439                },
6440                window,
6441                cx,
6442            )
6443        })
6444        .await
6445        .unwrap();
6446
6447        assert_item_labels(&pane, ["C*"], cx);
6448
6449        add_labeled_item(&pane, "A", true, ItemBufferKind::Singleton, cx).update(cx, |item, cx| {
6450            item.project_items
6451                .push(TestProjectItem::new_dirty(1, "A.txt", cx))
6452        });
6453        add_labeled_item(&pane, "B", true, ItemBufferKind::Multibuffer, cx).update(
6454            cx,
6455            |item, cx| {
6456                item.project_items
6457                    .push(TestProjectItem::new_dirty(2, "B.txt", cx))
6458            },
6459        );
6460        add_labeled_item(&pane, "D", true, ItemBufferKind::Multibuffer, cx).update(
6461            cx,
6462            |item, cx| {
6463                item.project_items
6464                    .push(TestProjectItem::new_dirty(3, "D.txt", cx))
6465            },
6466        );
6467        assert_item_labels(&pane, ["C", "A^", "B^", "D*^"], cx);
6468
6469        let save = pane.update_in(cx, |pane, window, cx| {
6470            pane.close_multibuffer_items(
6471                &CloseMultibufferItems {
6472                    save_intent: None,
6473                    close_pinned: false,
6474                },
6475                window,
6476                cx,
6477            )
6478        });
6479
6480        cx.executor().run_until_parked();
6481        cx.simulate_prompt_answer("Save all");
6482        save.await.unwrap();
6483        assert_item_labels(&pane, ["C", "A*^"], cx);
6484
6485        add_labeled_item(&pane, "B", true, ItemBufferKind::Multibuffer, cx).update(
6486            cx,
6487            |item, cx| {
6488                item.project_items
6489                    .push(TestProjectItem::new_dirty(2, "B.txt", cx))
6490            },
6491        );
6492        add_labeled_item(&pane, "D", true, ItemBufferKind::Multibuffer, cx).update(
6493            cx,
6494            |item, cx| {
6495                item.project_items
6496                    .push(TestProjectItem::new_dirty(3, "D.txt", cx))
6497            },
6498        );
6499        assert_item_labels(&pane, ["C", "A^", "B^", "D*^"], cx);
6500        let save = pane.update_in(cx, |pane, window, cx| {
6501            pane.close_multibuffer_items(
6502                &CloseMultibufferItems {
6503                    save_intent: None,
6504                    close_pinned: false,
6505                },
6506                window,
6507                cx,
6508            )
6509        });
6510
6511        cx.executor().run_until_parked();
6512        cx.simulate_prompt_answer("Discard all");
6513        save.await.unwrap();
6514        assert_item_labels(&pane, ["C", "A*^"], cx);
6515    }
6516
6517    #[gpui::test]
6518    async fn test_close_with_save_intent(cx: &mut TestAppContext) {
6519        init_test(cx);
6520        let fs = FakeFs::new(cx.executor());
6521
6522        let project = Project::test(fs, None, cx).await;
6523        let (workspace, cx) =
6524            cx.add_window_view(|window, cx| Workspace::test_new(project, window, cx));
6525        let pane = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
6526
6527        let a = cx.update(|_, cx| TestProjectItem::new_dirty(1, "A.txt", cx));
6528        let b = cx.update(|_, cx| TestProjectItem::new_dirty(1, "B.txt", cx));
6529        let c = cx.update(|_, cx| TestProjectItem::new_dirty(1, "C.txt", cx));
6530
6531        add_labeled_item(&pane, "AB", true, cx).update(cx, |item, _| {
6532            item.project_items.push(a.clone());
6533            item.project_items.push(b.clone());
6534        });
6535        add_labeled_item(&pane, "C", true, cx)
6536            .update(cx, |item, _| item.project_items.push(c.clone()));
6537        assert_item_labels(&pane, ["AB^", "C*^"], cx);
6538
6539        pane.update_in(cx, |pane, window, cx| {
6540            pane.close_all_items(
6541                &CloseAllItems {
6542                    save_intent: Some(SaveIntent::Save),
6543                    close_pinned: false,
6544                },
6545                window,
6546                cx,
6547            )
6548        })
6549        .await
6550        .unwrap();
6551
6552        assert_item_labels(&pane, [], cx);
6553        cx.update(|_, cx| {
6554            assert!(!a.read(cx).is_dirty);
6555            assert!(!b.read(cx).is_dirty);
6556            assert!(!c.read(cx).is_dirty);
6557        });
6558    }
6559
6560    #[gpui::test]
6561    async fn test_new_tab_scrolls_into_view_completely(cx: &mut TestAppContext) {
6562        // Arrange
6563        init_test(cx);
6564        let fs = FakeFs::new(cx.executor());
6565
6566        let project = Project::test(fs, None, cx).await;
6567        let (workspace, cx) =
6568            cx.add_window_view(|window, cx| Workspace::test_new(project, window, cx));
6569        let pane = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
6570
6571        cx.simulate_resize(size(px(300.), px(300.)));
6572
6573        add_labeled_item(&pane, "untitled", false, cx);
6574        add_labeled_item(&pane, "untitled", false, cx);
6575        add_labeled_item(&pane, "untitled", false, cx);
6576        add_labeled_item(&pane, "untitled", false, cx);
6577        // Act: this should trigger a scroll
6578        add_labeled_item(&pane, "untitled", false, cx);
6579        // Assert
6580        let tab_bar_scroll_handle =
6581            pane.update_in(cx, |pane, _window, _cx| pane.tab_bar_scroll_handle.clone());
6582        assert_eq!(tab_bar_scroll_handle.children_count(), 6);
6583        let tab_bounds = cx.debug_bounds("TAB-3").unwrap();
6584        let new_tab_button_bounds = cx.debug_bounds("ICON-Plus").unwrap();
6585        let scroll_bounds = tab_bar_scroll_handle.bounds();
6586        let scroll_offset = tab_bar_scroll_handle.offset();
6587        assert!(tab_bounds.right() <= scroll_bounds.right() + scroll_offset.x);
6588        // -39.5 is the magic number for this setup
6589        assert_eq!(scroll_offset.x, px(-39.5));
6590        assert!(
6591            !tab_bounds.intersects(&new_tab_button_bounds),
6592            "Tab should not overlap with the new tab button, if this is failing check if there's been a redesign!"
6593        );
6594    }
6595
6596    #[gpui::test]
6597    async fn test_close_all_items_including_pinned(cx: &mut TestAppContext) {
6598        init_test(cx);
6599        let fs = FakeFs::new(cx.executor());
6600
6601        let project = Project::test(fs, None, cx).await;
6602        let (workspace, cx) =
6603            cx.add_window_view(|window, cx| Workspace::test_new(project, window, cx));
6604        let pane = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
6605
6606        let item_a = add_labeled_item(&pane, "A", false, cx);
6607        add_labeled_item(&pane, "B", false, cx);
6608        add_labeled_item(&pane, "C", false, cx);
6609        assert_item_labels(&pane, ["A", "B", "C*"], cx);
6610
6611        pane.update_in(cx, |pane, window, cx| {
6612            let ix = pane.index_for_item_id(item_a.item_id()).unwrap();
6613            pane.pin_tab_at(ix, window, cx);
6614            pane.close_all_items(
6615                &CloseAllItems {
6616                    save_intent: None,
6617                    close_pinned: true,
6618                },
6619                window,
6620                cx,
6621            )
6622        })
6623        .await
6624        .unwrap();
6625        assert_item_labels(&pane, [], cx);
6626    }
6627
6628    #[gpui::test]
6629    async fn test_close_pinned_tab_with_non_pinned_in_same_pane(cx: &mut TestAppContext) {
6630        init_test(cx);
6631        let fs = FakeFs::new(cx.executor());
6632        let project = Project::test(fs, None, cx).await;
6633        let (workspace, cx) =
6634            cx.add_window_view(|window, cx| Workspace::test_new(project, window, cx));
6635
6636        // Non-pinned tabs in same pane
6637        let pane = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
6638        add_labeled_item(&pane, "A", false, cx);
6639        add_labeled_item(&pane, "B", false, cx);
6640        add_labeled_item(&pane, "C", false, cx);
6641        pane.update_in(cx, |pane, window, cx| {
6642            pane.pin_tab_at(0, window, cx);
6643        });
6644        set_labeled_items(&pane, ["A*", "B", "C"], cx);
6645        pane.update_in(cx, |pane, window, cx| {
6646            pane.close_active_item(
6647                &CloseActiveItem {
6648                    save_intent: None,
6649                    close_pinned: false,
6650                },
6651                window,
6652                cx,
6653            )
6654            .unwrap();
6655        });
6656        // Non-pinned tab should be active
6657        assert_item_labels(&pane, ["A!", "B*", "C"], cx);
6658    }
6659
6660    #[gpui::test]
6661    async fn test_close_pinned_tab_with_non_pinned_in_different_pane(cx: &mut TestAppContext) {
6662        init_test(cx);
6663        let fs = FakeFs::new(cx.executor());
6664        let project = Project::test(fs, None, cx).await;
6665        let (workspace, cx) =
6666            cx.add_window_view(|window, cx| Workspace::test_new(project, window, cx));
6667
6668        // No non-pinned tabs in same pane, non-pinned tabs in another pane
6669        let pane1 = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
6670        let pane2 = workspace.update_in(cx, |workspace, window, cx| {
6671            workspace.split_pane(pane1.clone(), SplitDirection::Right, window, cx)
6672        });
6673        add_labeled_item(&pane1, "A", false, cx);
6674        pane1.update_in(cx, |pane, window, cx| {
6675            pane.pin_tab_at(0, window, cx);
6676        });
6677        set_labeled_items(&pane1, ["A*"], cx);
6678        add_labeled_item(&pane2, "B", false, cx);
6679        set_labeled_items(&pane2, ["B"], cx);
6680        pane1.update_in(cx, |pane, window, cx| {
6681            pane.close_active_item(
6682                &CloseActiveItem {
6683                    save_intent: None,
6684                    close_pinned: false,
6685                },
6686                window,
6687                cx,
6688            )
6689            .unwrap();
6690        });
6691        //  Non-pinned tab of other pane should be active
6692        assert_item_labels(&pane2, ["B*"], cx);
6693    }
6694
6695    #[gpui::test]
6696    async fn ensure_item_closing_actions_do_not_panic_when_no_items_exist(cx: &mut TestAppContext) {
6697        init_test(cx);
6698        let fs = FakeFs::new(cx.executor());
6699        let project = Project::test(fs, None, cx).await;
6700        let (workspace, cx) =
6701            cx.add_window_view(|window, cx| Workspace::test_new(project, window, cx));
6702
6703        let pane = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
6704        assert_item_labels(&pane, [], cx);
6705
6706        pane.update_in(cx, |pane, window, cx| {
6707            pane.close_active_item(
6708                &CloseActiveItem {
6709                    save_intent: None,
6710                    close_pinned: false,
6711                },
6712                window,
6713                cx,
6714            )
6715        })
6716        .await
6717        .unwrap();
6718
6719        pane.update_in(cx, |pane, window, cx| {
6720            pane.close_other_items(
6721                &CloseOtherItems {
6722                    save_intent: None,
6723                    close_pinned: false,
6724                },
6725                None,
6726                window,
6727                cx,
6728            )
6729        })
6730        .await
6731        .unwrap();
6732
6733        pane.update_in(cx, |pane, window, cx| {
6734            pane.close_all_items(
6735                &CloseAllItems {
6736                    save_intent: None,
6737                    close_pinned: false,
6738                },
6739                window,
6740                cx,
6741            )
6742        })
6743        .await
6744        .unwrap();
6745
6746        pane.update_in(cx, |pane, window, cx| {
6747            pane.close_clean_items(
6748                &CloseCleanItems {
6749                    close_pinned: false,
6750                },
6751                window,
6752                cx,
6753            )
6754        })
6755        .await
6756        .unwrap();
6757
6758        pane.update_in(cx, |pane, window, cx| {
6759            pane.close_items_to_the_right_by_id(
6760                None,
6761                &CloseItemsToTheRight {
6762                    close_pinned: false,
6763                },
6764                window,
6765                cx,
6766            )
6767        })
6768        .await
6769        .unwrap();
6770
6771        pane.update_in(cx, |pane, window, cx| {
6772            pane.close_items_to_the_left_by_id(
6773                None,
6774                &CloseItemsToTheLeft {
6775                    close_pinned: false,
6776                },
6777                window,
6778                cx,
6779            )
6780        })
6781        .await
6782        .unwrap();
6783    }
6784
6785    #[gpui::test]
6786    async fn test_item_swapping_actions(cx: &mut TestAppContext) {
6787        init_test(cx);
6788        let fs = FakeFs::new(cx.executor());
6789        let project = Project::test(fs, None, cx).await;
6790        let (workspace, cx) =
6791            cx.add_window_view(|window, cx| Workspace::test_new(project, window, cx));
6792
6793        let pane = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
6794        assert_item_labels(&pane, [], cx);
6795
6796        // Test that these actions do not panic
6797        pane.update_in(cx, |pane, window, cx| {
6798            pane.swap_item_right(&Default::default(), window, cx);
6799        });
6800
6801        pane.update_in(cx, |pane, window, cx| {
6802            pane.swap_item_left(&Default::default(), window, cx);
6803        });
6804
6805        add_labeled_item(&pane, "A", false, cx);
6806        add_labeled_item(&pane, "B", false, cx);
6807        add_labeled_item(&pane, "C", false, cx);
6808        assert_item_labels(&pane, ["A", "B", "C*"], cx);
6809
6810        pane.update_in(cx, |pane, window, cx| {
6811            pane.swap_item_right(&Default::default(), window, cx);
6812        });
6813        assert_item_labels(&pane, ["A", "B", "C*"], cx);
6814
6815        pane.update_in(cx, |pane, window, cx| {
6816            pane.swap_item_left(&Default::default(), window, cx);
6817        });
6818        assert_item_labels(&pane, ["A", "C*", "B"], cx);
6819
6820        pane.update_in(cx, |pane, window, cx| {
6821            pane.swap_item_left(&Default::default(), window, cx);
6822        });
6823        assert_item_labels(&pane, ["C*", "A", "B"], cx);
6824
6825        pane.update_in(cx, |pane, window, cx| {
6826            pane.swap_item_left(&Default::default(), window, cx);
6827        });
6828        assert_item_labels(&pane, ["C*", "A", "B"], cx);
6829
6830        pane.update_in(cx, |pane, window, cx| {
6831            pane.swap_item_right(&Default::default(), window, cx);
6832        });
6833        assert_item_labels(&pane, ["A", "C*", "B"], cx);
6834    }
6835
6836    fn init_test(cx: &mut TestAppContext) {
6837        cx.update(|cx| {
6838            let settings_store = SettingsStore::test(cx);
6839            cx.set_global(settings_store);
6840            theme::init(LoadThemes::JustBase, cx);
6841            crate::init_settings(cx);
6842            Project::init_settings(cx);
6843        });
6844    }
6845
6846    fn set_max_tabs(cx: &mut TestAppContext, value: Option<usize>) {
6847        cx.update_global(|store: &mut SettingsStore, cx| {
6848            store.update_user_settings(cx, |settings| {
6849                settings.workspace.max_tabs = value.map(|v| NonZero::new(v).unwrap())
6850            });
6851        });
6852    }
6853
6854    fn add_labeled_item(
6855        pane: &Entity<Pane>,
6856        label: &str,
6857        is_dirty: bool,
6858        cx: &mut VisualTestContext,
6859    ) -> Box<Entity<TestItem>> {
6860        pane.update_in(cx, |pane, window, cx| {
6861            let labeled_item =
6862                Box::new(cx.new(|cx| TestItem::new(cx).with_label(label).with_dirty(is_dirty)));
6863            pane.add_item(labeled_item.clone(), false, false, None, window, cx);
6864            labeled_item
6865        })
6866    }
6867
6868    fn set_labeled_items<const COUNT: usize>(
6869        pane: &Entity<Pane>,
6870        labels: [&str; COUNT],
6871        cx: &mut VisualTestContext,
6872    ) -> [Box<Entity<TestItem>>; COUNT] {
6873        pane.update_in(cx, |pane, window, cx| {
6874            pane.items.clear();
6875            let mut active_item_index = 0;
6876
6877            let mut index = 0;
6878            let items = labels.map(|mut label| {
6879                if label.ends_with('*') {
6880                    label = label.trim_end_matches('*');
6881                    active_item_index = index;
6882                }
6883
6884                let labeled_item = Box::new(cx.new(|cx| TestItem::new(cx).with_label(label)));
6885                pane.add_item(labeled_item.clone(), false, false, None, window, cx);
6886                index += 1;
6887                labeled_item
6888            });
6889
6890            pane.activate_item(active_item_index, false, false, window, cx);
6891
6892            items
6893        })
6894    }
6895
6896    // Assert the item label, with the active item label suffixed with a '*'
6897    #[track_caller]
6898    fn assert_item_labels<const COUNT: usize>(
6899        pane: &Entity<Pane>,
6900        expected_states: [&str; COUNT],
6901        cx: &mut VisualTestContext,
6902    ) {
6903        let actual_states = pane.update(cx, |pane, cx| {
6904            pane.items
6905                .iter()
6906                .enumerate()
6907                .map(|(ix, item)| {
6908                    let mut state = item
6909                        .to_any()
6910                        .downcast::<TestItem>()
6911                        .unwrap()
6912                        .read(cx)
6913                        .label
6914                        .clone();
6915                    if ix == pane.active_item_index {
6916                        state.push('*');
6917                    }
6918                    if item.is_dirty(cx) {
6919                        state.push('^');
6920                    }
6921                    if pane.is_tab_pinned(ix) {
6922                        state.push('!');
6923                    }
6924                    state
6925                })
6926                .collect::<Vec<_>>()
6927        });
6928        assert_eq!(
6929            actual_states, expected_states,
6930            "pane items do not match expectation"
6931        );
6932    }
6933}