pane.rs

   1use crate::{
   2    CloseWindow, NewFile, NewTerminal, OpenInTerminal, OpenOptions, OpenTerminal, OpenVisible,
   3    SplitDirection, ToggleFileFinder, ToggleProjectSymbols, ToggleZoom, Workspace,
   4    WorkspaceItemBuilder,
   5    invalid_buffer_view::InvalidBufferView,
   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::<InvalidBufferView>() {
 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::<InvalidBufferView>()
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                                window,
2739                                cx,
2740                            )
2741                        })
2742                    } else {
2743                        this.tooltip(Tooltip::text(end_slot_tooltip_text))
2744                    }
2745                });
2746                this.end_slot(end_slot)
2747            })
2748            .child(
2749                h_flex()
2750                    .gap_1()
2751                    .items_center()
2752                    .children(
2753                        std::iter::once(if let Some(decorated_icon) = decorated_icon {
2754                            Some(div().child(decorated_icon.into_any_element()))
2755                        } else {
2756                            icon.map(|icon| div().child(icon.into_any_element()))
2757                        })
2758                        .flatten(),
2759                    )
2760                    .child(label),
2761            );
2762
2763        let single_entry_to_resolve = (self.items[ix].buffer_kind(cx) == ItemBufferKind::Singleton)
2764            .then(|| self.items[ix].project_entry_ids(cx).get(0).copied())
2765            .flatten();
2766
2767        let total_items = self.items.len();
2768        let has_multibuffer_items = self
2769            .items
2770            .iter()
2771            .any(|item| item.buffer_kind(cx) == ItemBufferKind::Multibuffer);
2772        let has_items_to_left = ix > 0;
2773        let has_items_to_right = ix < total_items - 1;
2774        let has_clean_items = self.items.iter().any(|item| !item.is_dirty(cx));
2775        let is_pinned = self.is_tab_pinned(ix);
2776        let pane = cx.entity().downgrade();
2777        let menu_context = item.item_focus_handle(cx);
2778        right_click_menu(ix)
2779            .trigger(|_, _, _| tab)
2780            .menu(move |window, cx| {
2781                let pane = pane.clone();
2782                let menu_context = menu_context.clone();
2783                ContextMenu::build(window, cx, move |mut menu, window, cx| {
2784                    let close_active_item_action = CloseActiveItem {
2785                        save_intent: None,
2786                        close_pinned: true,
2787                    };
2788                    let close_inactive_items_action = CloseOtherItems {
2789                        save_intent: None,
2790                        close_pinned: false,
2791                    };
2792                    let close_multibuffers_action = CloseMultibufferItems {
2793                        save_intent: None,
2794                        close_pinned: false,
2795                    };
2796                    let close_items_to_the_left_action = CloseItemsToTheLeft {
2797                        close_pinned: false,
2798                    };
2799                    let close_items_to_the_right_action = CloseItemsToTheRight {
2800                        close_pinned: false,
2801                    };
2802                    let close_clean_items_action = CloseCleanItems {
2803                        close_pinned: false,
2804                    };
2805                    let close_all_items_action = CloseAllItems {
2806                        save_intent: None,
2807                        close_pinned: false,
2808                    };
2809                    if let Some(pane) = pane.upgrade() {
2810                        menu = menu
2811                            .entry(
2812                                "Close",
2813                                Some(Box::new(close_active_item_action)),
2814                                window.handler_for(&pane, move |pane, window, cx| {
2815                                    pane.close_item_by_id(item_id, SaveIntent::Close, window, cx)
2816                                        .detach_and_log_err(cx);
2817                                }),
2818                            )
2819                            .item(ContextMenuItem::Entry(
2820                                ContextMenuEntry::new("Close Others")
2821                                    .action(Box::new(close_inactive_items_action.clone()))
2822                                    .disabled(total_items == 1)
2823                                    .handler(window.handler_for(&pane, move |pane, window, cx| {
2824                                        pane.close_other_items(
2825                                            &close_inactive_items_action,
2826                                            Some(item_id),
2827                                            window,
2828                                            cx,
2829                                        )
2830                                        .detach_and_log_err(cx);
2831                                    })),
2832                            ))
2833                            // We make this optional, instead of using disabled as to not overwhelm the context menu unnecessarily
2834                            .extend(has_multibuffer_items.then(|| {
2835                                ContextMenuItem::Entry(
2836                                    ContextMenuEntry::new("Close Multibuffers")
2837                                        .action(Box::new(close_multibuffers_action.clone()))
2838                                        .handler(window.handler_for(
2839                                            &pane,
2840                                            move |pane, window, cx| {
2841                                                pane.close_multibuffer_items(
2842                                                    &close_multibuffers_action,
2843                                                    window,
2844                                                    cx,
2845                                                )
2846                                                .detach_and_log_err(cx);
2847                                            },
2848                                        )),
2849                                )
2850                            }))
2851                            .separator()
2852                            .item(ContextMenuItem::Entry(
2853                                ContextMenuEntry::new("Close Left")
2854                                    .action(Box::new(close_items_to_the_left_action.clone()))
2855                                    .disabled(!has_items_to_left)
2856                                    .handler(window.handler_for(&pane, move |pane, window, cx| {
2857                                        pane.close_items_to_the_left_by_id(
2858                                            Some(item_id),
2859                                            &close_items_to_the_left_action,
2860                                            window,
2861                                            cx,
2862                                        )
2863                                        .detach_and_log_err(cx);
2864                                    })),
2865                            ))
2866                            .item(ContextMenuItem::Entry(
2867                                ContextMenuEntry::new("Close Right")
2868                                    .action(Box::new(close_items_to_the_right_action.clone()))
2869                                    .disabled(!has_items_to_right)
2870                                    .handler(window.handler_for(&pane, move |pane, window, cx| {
2871                                        pane.close_items_to_the_right_by_id(
2872                                            Some(item_id),
2873                                            &close_items_to_the_right_action,
2874                                            window,
2875                                            cx,
2876                                        )
2877                                        .detach_and_log_err(cx);
2878                                    })),
2879                            ))
2880                            .separator()
2881                            .item(ContextMenuItem::Entry(
2882                                ContextMenuEntry::new("Close Clean")
2883                                    .action(Box::new(close_clean_items_action.clone()))
2884                                    .disabled(!has_clean_items)
2885                                    .handler(window.handler_for(&pane, move |pane, window, cx| {
2886                                        pane.close_clean_items(
2887                                            &close_clean_items_action,
2888                                            window,
2889                                            cx,
2890                                        )
2891                                        .detach_and_log_err(cx)
2892                                    })),
2893                            ))
2894                            .entry(
2895                                "Close All",
2896                                Some(Box::new(close_all_items_action.clone())),
2897                                window.handler_for(&pane, move |pane, window, cx| {
2898                                    pane.close_all_items(&close_all_items_action, window, cx)
2899                                        .detach_and_log_err(cx)
2900                                }),
2901                            );
2902
2903                        let pin_tab_entries = |menu: ContextMenu| {
2904                            menu.separator().map(|this| {
2905                                if is_pinned {
2906                                    this.entry(
2907                                        "Unpin Tab",
2908                                        Some(TogglePinTab.boxed_clone()),
2909                                        window.handler_for(&pane, move |pane, window, cx| {
2910                                            pane.unpin_tab_at(ix, window, cx);
2911                                        }),
2912                                    )
2913                                } else {
2914                                    this.entry(
2915                                        "Pin Tab",
2916                                        Some(TogglePinTab.boxed_clone()),
2917                                        window.handler_for(&pane, move |pane, window, cx| {
2918                                            pane.pin_tab_at(ix, window, cx);
2919                                        }),
2920                                    )
2921                                }
2922                            })
2923                        };
2924                        if let Some(entry) = single_entry_to_resolve {
2925                            let project_path = pane
2926                                .read(cx)
2927                                .item_for_entry(entry, cx)
2928                                .and_then(|item| item.project_path(cx));
2929                            let worktree = project_path.as_ref().and_then(|project_path| {
2930                                pane.read(cx)
2931                                    .project
2932                                    .upgrade()?
2933                                    .read(cx)
2934                                    .worktree_for_id(project_path.worktree_id, cx)
2935                            });
2936                            let has_relative_path = worktree.as_ref().is_some_and(|worktree| {
2937                                worktree
2938                                    .read(cx)
2939                                    .root_entry()
2940                                    .is_some_and(|entry| entry.is_dir())
2941                            });
2942
2943                            let entry_abs_path = pane.read(cx).entry_abs_path(entry, cx);
2944                            let parent_abs_path = entry_abs_path
2945                                .as_deref()
2946                                .and_then(|abs_path| Some(abs_path.parent()?.to_path_buf()));
2947                            let relative_path = project_path
2948                                .map(|project_path| project_path.path)
2949                                .filter(|_| has_relative_path);
2950
2951                            let visible_in_project_panel = relative_path.is_some()
2952                                && worktree.is_some_and(|worktree| worktree.read(cx).is_visible());
2953
2954                            let entry_id = entry.to_proto();
2955                            menu = menu
2956                                .separator()
2957                                .when_some(entry_abs_path, |menu, abs_path| {
2958                                    menu.entry(
2959                                        "Copy Path",
2960                                        Some(Box::new(zed_actions::workspace::CopyPath)),
2961                                        window.handler_for(&pane, move |_, _, cx| {
2962                                            cx.write_to_clipboard(ClipboardItem::new_string(
2963                                                abs_path.to_string_lossy().into_owned(),
2964                                            ));
2965                                        }),
2966                                    )
2967                                })
2968                                .when_some(relative_path, |menu, relative_path| {
2969                                    menu.entry(
2970                                        "Copy Relative Path",
2971                                        Some(Box::new(zed_actions::workspace::CopyRelativePath)),
2972                                        window.handler_for(&pane, move |this, _, cx| {
2973                                            let Some(project) = this.project.upgrade() else {
2974                                                return;
2975                                            };
2976                                            let path_style = project
2977                                                .update(cx, |project, cx| project.path_style(cx));
2978                                            cx.write_to_clipboard(ClipboardItem::new_string(
2979                                                relative_path.display(path_style).to_string(),
2980                                            ));
2981                                        }),
2982                                    )
2983                                })
2984                                .map(pin_tab_entries)
2985                                .separator()
2986                                .when(visible_in_project_panel, |menu| {
2987                                    menu.entry(
2988                                        "Reveal In Project Panel",
2989                                        Some(Box::new(RevealInProjectPanel::default())),
2990                                        window.handler_for(&pane, move |pane, _, cx| {
2991                                            pane.project
2992                                                .update(cx, |_, cx| {
2993                                                    cx.emit(project::Event::RevealInProjectPanel(
2994                                                        ProjectEntryId::from_proto(entry_id),
2995                                                    ))
2996                                                })
2997                                                .ok();
2998                                        }),
2999                                    )
3000                                })
3001                                .when_some(parent_abs_path, |menu, parent_abs_path| {
3002                                    menu.entry(
3003                                        "Open in Terminal",
3004                                        Some(Box::new(OpenInTerminal)),
3005                                        window.handler_for(&pane, move |_, window, cx| {
3006                                            window.dispatch_action(
3007                                                OpenTerminal {
3008                                                    working_directory: parent_abs_path.clone(),
3009                                                }
3010                                                .boxed_clone(),
3011                                                cx,
3012                                            );
3013                                        }),
3014                                    )
3015                                });
3016                        } else {
3017                            menu = menu.map(pin_tab_entries);
3018                        }
3019                    }
3020
3021                    menu.context(menu_context)
3022                })
3023            })
3024    }
3025
3026    fn render_tab_bar(&mut self, window: &mut Window, cx: &mut Context<Pane>) -> AnyElement {
3027        let focus_handle = self.focus_handle.clone();
3028        let navigate_backward = IconButton::new("navigate_backward", IconName::ArrowLeft)
3029            .icon_size(IconSize::Small)
3030            .on_click({
3031                let entity = cx.entity();
3032                move |_, window, cx| {
3033                    entity.update(cx, |pane, cx| {
3034                        pane.navigate_backward(&Default::default(), window, cx)
3035                    })
3036                }
3037            })
3038            .disabled(!self.can_navigate_backward())
3039            .tooltip({
3040                let focus_handle = focus_handle.clone();
3041                move |window, cx| {
3042                    Tooltip::for_action_in("Go Back", &GoBack, &focus_handle, window, cx)
3043                }
3044            });
3045
3046        let navigate_forward = IconButton::new("navigate_forward", IconName::ArrowRight)
3047            .icon_size(IconSize::Small)
3048            .on_click({
3049                let entity = cx.entity();
3050                move |_, window, cx| {
3051                    entity.update(cx, |pane, cx| {
3052                        pane.navigate_forward(&Default::default(), window, cx)
3053                    })
3054                }
3055            })
3056            .disabled(!self.can_navigate_forward())
3057            .tooltip({
3058                let focus_handle = focus_handle.clone();
3059                move |window, cx| {
3060                    Tooltip::for_action_in("Go Forward", &GoForward, &focus_handle, window, cx)
3061                }
3062            });
3063
3064        let mut tab_items = self
3065            .items
3066            .iter()
3067            .enumerate()
3068            .zip(tab_details(&self.items, window, cx))
3069            .map(|((ix, item), detail)| {
3070                self.render_tab(ix, &**item, detail, &focus_handle, window, cx)
3071            })
3072            .collect::<Vec<_>>();
3073        let tab_count = tab_items.len();
3074        if self.is_tab_pinned(tab_count) {
3075            log::warn!(
3076                "Pinned tab count ({}) exceeds actual tab count ({}). \
3077                This should not happen. If possible, add reproduction steps, \
3078                in a comment, to https://github.com/zed-industries/zed/issues/33342",
3079                self.pinned_tab_count,
3080                tab_count
3081            );
3082            self.pinned_tab_count = tab_count;
3083        }
3084        let unpinned_tabs = tab_items.split_off(self.pinned_tab_count);
3085        let pinned_tabs = tab_items;
3086        TabBar::new("tab_bar")
3087            .when(
3088                self.display_nav_history_buttons.unwrap_or_default(),
3089                |tab_bar| {
3090                    tab_bar
3091                        .start_child(navigate_backward)
3092                        .start_child(navigate_forward)
3093                },
3094            )
3095            .map(|tab_bar| {
3096                if self.show_tab_bar_buttons {
3097                    let render_tab_buttons = self.render_tab_bar_buttons.clone();
3098                    let (left_children, right_children) = render_tab_buttons(self, window, cx);
3099                    tab_bar
3100                        .start_children(left_children)
3101                        .end_children(right_children)
3102                } else {
3103                    tab_bar
3104                }
3105            })
3106            .children(pinned_tabs.len().ne(&0).then(|| {
3107                let max_scroll = self.tab_bar_scroll_handle.max_offset().width;
3108                // We need to check both because offset returns delta values even when the scroll handle is not scrollable
3109                let is_scrollable = !max_scroll.is_zero();
3110                let is_scrolled = self.tab_bar_scroll_handle.offset().x < px(0.);
3111                let has_active_unpinned_tab = self.active_item_index >= self.pinned_tab_count;
3112                h_flex()
3113                    .children(pinned_tabs)
3114                    .when(is_scrollable && is_scrolled, |this| {
3115                        this.when(has_active_unpinned_tab, |this| this.border_r_2())
3116                            .when(!has_active_unpinned_tab, |this| this.border_r_1())
3117                            .border_color(cx.theme().colors().border)
3118                    })
3119            }))
3120            .child(
3121                h_flex()
3122                    .id("unpinned tabs")
3123                    .overflow_x_scroll()
3124                    .w_full()
3125                    .track_scroll(&self.tab_bar_scroll_handle)
3126                    .on_scroll_wheel(cx.listener(|this, _, _, _| {
3127                        this.suppress_scroll = true;
3128                    }))
3129                    .children(unpinned_tabs)
3130                    .child(
3131                        div()
3132                            .id("tab_bar_drop_target")
3133                            .min_w_6()
3134                            // HACK: This empty child is currently necessary to force the drop target to appear
3135                            // despite us setting a min width above.
3136                            .child("")
3137                            // HACK: h_full doesn't occupy the complete height, using fixed height instead
3138                            .h(Tab::container_height(cx))
3139                            .flex_grow()
3140                            .drag_over::<DraggedTab>(|bar, _, _, cx| {
3141                                bar.bg(cx.theme().colors().drop_target_background)
3142                            })
3143                            .drag_over::<DraggedSelection>(|bar, _, _, cx| {
3144                                bar.bg(cx.theme().colors().drop_target_background)
3145                            })
3146                            .on_drop(cx.listener(
3147                                move |this, dragged_tab: &DraggedTab, window, cx| {
3148                                    this.drag_split_direction = None;
3149                                    this.handle_tab_drop(dragged_tab, this.items.len(), window, cx)
3150                                },
3151                            ))
3152                            .on_drop(cx.listener(
3153                                move |this, selection: &DraggedSelection, window, cx| {
3154                                    this.drag_split_direction = None;
3155                                    this.handle_project_entry_drop(
3156                                        &selection.active_selection.entry_id,
3157                                        Some(tab_count),
3158                                        window,
3159                                        cx,
3160                                    )
3161                                },
3162                            ))
3163                            .on_drop(cx.listener(move |this, paths, window, cx| {
3164                                this.drag_split_direction = None;
3165                                this.handle_external_paths_drop(paths, window, cx)
3166                            }))
3167                            .on_click(cx.listener(move |this, event: &ClickEvent, window, cx| {
3168                                if event.click_count() == 2 {
3169                                    window.dispatch_action(
3170                                        this.double_click_dispatch_action.boxed_clone(),
3171                                        cx,
3172                                    );
3173                                }
3174                            })),
3175                    ),
3176            )
3177            .into_any_element()
3178    }
3179
3180    pub fn render_menu_overlay(menu: &Entity<ContextMenu>) -> Div {
3181        div().absolute().bottom_0().right_0().size_0().child(
3182            deferred(anchored().anchor(Corner::TopRight).child(menu.clone())).with_priority(1),
3183        )
3184    }
3185
3186    pub fn set_zoomed(&mut self, zoomed: bool, cx: &mut Context<Self>) {
3187        self.zoomed = zoomed;
3188        cx.notify();
3189    }
3190
3191    pub fn is_zoomed(&self) -> bool {
3192        self.zoomed
3193    }
3194
3195    fn handle_drag_move<T: 'static>(
3196        &mut self,
3197        event: &DragMoveEvent<T>,
3198        window: &mut Window,
3199        cx: &mut Context<Self>,
3200    ) {
3201        let can_split_predicate = self.can_split_predicate.take();
3202        let can_split = match &can_split_predicate {
3203            Some(can_split_predicate) => {
3204                can_split_predicate(self, event.dragged_item(), window, cx)
3205            }
3206            None => false,
3207        };
3208        self.can_split_predicate = can_split_predicate;
3209        if !can_split {
3210            return;
3211        }
3212
3213        let rect = event.bounds.size;
3214
3215        let size = event.bounds.size.width.min(event.bounds.size.height)
3216            * WorkspaceSettings::get_global(cx).drop_target_size;
3217
3218        let relative_cursor = Point::new(
3219            event.event.position.x - event.bounds.left(),
3220            event.event.position.y - event.bounds.top(),
3221        );
3222
3223        let direction = if relative_cursor.x < size
3224            || relative_cursor.x > rect.width - size
3225            || relative_cursor.y < size
3226            || relative_cursor.y > rect.height - size
3227        {
3228            [
3229                SplitDirection::Up,
3230                SplitDirection::Right,
3231                SplitDirection::Down,
3232                SplitDirection::Left,
3233            ]
3234            .iter()
3235            .min_by_key(|side| match side {
3236                SplitDirection::Up => relative_cursor.y,
3237                SplitDirection::Right => rect.width - relative_cursor.x,
3238                SplitDirection::Down => rect.height - relative_cursor.y,
3239                SplitDirection::Left => relative_cursor.x,
3240            })
3241            .cloned()
3242        } else {
3243            None
3244        };
3245
3246        if direction != self.drag_split_direction {
3247            self.drag_split_direction = direction;
3248        }
3249    }
3250
3251    pub fn handle_tab_drop(
3252        &mut self,
3253        dragged_tab: &DraggedTab,
3254        ix: usize,
3255        window: &mut Window,
3256        cx: &mut Context<Self>,
3257    ) {
3258        if let Some(custom_drop_handle) = self.custom_drop_handle.clone()
3259            && let ControlFlow::Break(()) = custom_drop_handle(self, dragged_tab, window, cx)
3260        {
3261            return;
3262        }
3263        let mut to_pane = cx.entity();
3264        let split_direction = self.drag_split_direction;
3265        let item_id = dragged_tab.item.item_id();
3266        if let Some(preview_item_id) = self.preview_item_id
3267            && item_id == preview_item_id
3268        {
3269            self.set_preview_item_id(None, cx);
3270        }
3271
3272        let is_clone = cfg!(target_os = "macos") && window.modifiers().alt
3273            || cfg!(not(target_os = "macos")) && window.modifiers().control;
3274
3275        let from_pane = dragged_tab.pane.clone();
3276
3277        self.workspace
3278            .update(cx, |_, cx| {
3279                cx.defer_in(window, move |workspace, window, cx| {
3280                    if let Some(split_direction) = split_direction {
3281                        to_pane = workspace.split_pane(to_pane, split_direction, window, cx);
3282                    }
3283                    let database_id = workspace.database_id();
3284                    let was_pinned_in_from_pane = from_pane.read_with(cx, |pane, _| {
3285                        pane.index_for_item_id(item_id)
3286                            .is_some_and(|ix| pane.is_tab_pinned(ix))
3287                    });
3288                    let to_pane_old_length = to_pane.read(cx).items.len();
3289                    if is_clone {
3290                        let Some(item) = from_pane
3291                            .read(cx)
3292                            .items()
3293                            .find(|item| item.item_id() == item_id)
3294                            .cloned()
3295                        else {
3296                            return;
3297                        };
3298                        let task = item.clone_on_split(database_id, window, cx);
3299                        let to_pane = to_pane.downgrade();
3300                        cx.spawn_in(window, async move |_, cx| {
3301                            if let Some(item) = task.await {
3302                                to_pane
3303                                    .update_in(cx, |pane, window, cx| {
3304                                        pane.add_item(item, true, true, None, window, cx)
3305                                    })
3306                                    .ok();
3307                            }
3308                        })
3309                        .detach();
3310                    } else {
3311                        move_item(&from_pane, &to_pane, item_id, ix, true, window, cx);
3312                    }
3313                    to_pane.update(cx, |this, _| {
3314                        if to_pane == from_pane {
3315                            let actual_ix = this
3316                                .items
3317                                .iter()
3318                                .position(|item| item.item_id() == item_id)
3319                                .unwrap_or(0);
3320
3321                            let is_pinned_in_to_pane = this.is_tab_pinned(actual_ix);
3322
3323                            if !was_pinned_in_from_pane && is_pinned_in_to_pane {
3324                                this.pinned_tab_count += 1;
3325                            } else if was_pinned_in_from_pane && !is_pinned_in_to_pane {
3326                                this.pinned_tab_count -= 1;
3327                            }
3328                        } else if this.items.len() >= to_pane_old_length {
3329                            let is_pinned_in_to_pane = this.is_tab_pinned(ix);
3330                            let item_created_pane = to_pane_old_length == 0;
3331                            let is_first_position = ix == 0;
3332                            let was_dropped_at_beginning = item_created_pane || is_first_position;
3333                            let should_remain_pinned = is_pinned_in_to_pane
3334                                || (was_pinned_in_from_pane && was_dropped_at_beginning);
3335
3336                            if should_remain_pinned {
3337                                this.pinned_tab_count += 1;
3338                            }
3339                        }
3340                    });
3341                });
3342            })
3343            .log_err();
3344    }
3345
3346    fn handle_dragged_selection_drop(
3347        &mut self,
3348        dragged_selection: &DraggedSelection,
3349        dragged_onto: Option<usize>,
3350        window: &mut Window,
3351        cx: &mut Context<Self>,
3352    ) {
3353        if let Some(custom_drop_handle) = self.custom_drop_handle.clone()
3354            && let ControlFlow::Break(()) = custom_drop_handle(self, dragged_selection, window, cx)
3355        {
3356            return;
3357        }
3358        self.handle_project_entry_drop(
3359            &dragged_selection.active_selection.entry_id,
3360            dragged_onto,
3361            window,
3362            cx,
3363        );
3364    }
3365
3366    fn handle_project_entry_drop(
3367        &mut self,
3368        project_entry_id: &ProjectEntryId,
3369        target: Option<usize>,
3370        window: &mut Window,
3371        cx: &mut Context<Self>,
3372    ) {
3373        if let Some(custom_drop_handle) = self.custom_drop_handle.clone()
3374            && let ControlFlow::Break(()) = custom_drop_handle(self, project_entry_id, window, cx)
3375        {
3376            return;
3377        }
3378        let mut to_pane = cx.entity();
3379        let split_direction = self.drag_split_direction;
3380        let project_entry_id = *project_entry_id;
3381        self.workspace
3382            .update(cx, |_, cx| {
3383                cx.defer_in(window, move |workspace, window, cx| {
3384                    if let Some(project_path) = workspace
3385                        .project()
3386                        .read(cx)
3387                        .path_for_entry(project_entry_id, cx)
3388                    {
3389                        let load_path_task = workspace.load_path(project_path.clone(), window, cx);
3390                        cx.spawn_in(window, async move |workspace, cx| {
3391                            if let Some((project_entry_id, build_item)) =
3392                                load_path_task.await.notify_async_err(cx)
3393                            {
3394                                let (to_pane, new_item_handle) = workspace
3395                                    .update_in(cx, |workspace, window, cx| {
3396                                        if let Some(split_direction) = split_direction {
3397                                            to_pane = workspace.split_pane(
3398                                                to_pane,
3399                                                split_direction,
3400                                                window,
3401                                                cx,
3402                                            );
3403                                        }
3404                                        let new_item_handle = to_pane.update(cx, |pane, cx| {
3405                                            pane.open_item(
3406                                                project_entry_id,
3407                                                project_path,
3408                                                true,
3409                                                false,
3410                                                true,
3411                                                target,
3412                                                window,
3413                                                cx,
3414                                                build_item,
3415                                            )
3416                                        });
3417                                        (to_pane, new_item_handle)
3418                                    })
3419                                    .log_err()?;
3420                                to_pane
3421                                    .update_in(cx, |this, window, cx| {
3422                                        let Some(index) = this.index_for_item(&*new_item_handle)
3423                                        else {
3424                                            return;
3425                                        };
3426
3427                                        if target.is_some_and(|target| this.is_tab_pinned(target)) {
3428                                            this.pin_tab_at(index, window, cx);
3429                                        }
3430                                    })
3431                                    .ok()?
3432                            }
3433                            Some(())
3434                        })
3435                        .detach();
3436                    };
3437                });
3438            })
3439            .log_err();
3440    }
3441
3442    fn handle_external_paths_drop(
3443        &mut self,
3444        paths: &ExternalPaths,
3445        window: &mut Window,
3446        cx: &mut Context<Self>,
3447    ) {
3448        if let Some(custom_drop_handle) = self.custom_drop_handle.clone()
3449            && let ControlFlow::Break(()) = custom_drop_handle(self, paths, window, cx)
3450        {
3451            return;
3452        }
3453        let mut to_pane = cx.entity();
3454        let mut split_direction = self.drag_split_direction;
3455        let paths = paths.paths().to_vec();
3456        let is_remote = self
3457            .workspace
3458            .update(cx, |workspace, cx| {
3459                if workspace.project().read(cx).is_via_collab() {
3460                    workspace.show_error(
3461                        &anyhow::anyhow!("Cannot drop files on a remote project"),
3462                        cx,
3463                    );
3464                    true
3465                } else {
3466                    false
3467                }
3468            })
3469            .unwrap_or(true);
3470        if is_remote {
3471            return;
3472        }
3473
3474        self.workspace
3475            .update(cx, |workspace, cx| {
3476                let fs = Arc::clone(workspace.project().read(cx).fs());
3477                cx.spawn_in(window, async move |workspace, cx| {
3478                    let mut is_file_checks = FuturesUnordered::new();
3479                    for path in &paths {
3480                        is_file_checks.push(fs.is_file(path))
3481                    }
3482                    let mut has_files_to_open = false;
3483                    while let Some(is_file) = is_file_checks.next().await {
3484                        if is_file {
3485                            has_files_to_open = true;
3486                            break;
3487                        }
3488                    }
3489                    drop(is_file_checks);
3490                    if !has_files_to_open {
3491                        split_direction = None;
3492                    }
3493
3494                    if let Ok((open_task, to_pane)) =
3495                        workspace.update_in(cx, |workspace, window, cx| {
3496                            if let Some(split_direction) = split_direction {
3497                                to_pane =
3498                                    workspace.split_pane(to_pane, split_direction, window, cx);
3499                            }
3500                            (
3501                                workspace.open_paths(
3502                                    paths,
3503                                    OpenOptions {
3504                                        visible: Some(OpenVisible::OnlyDirectories),
3505                                        ..Default::default()
3506                                    },
3507                                    Some(to_pane.downgrade()),
3508                                    window,
3509                                    cx,
3510                                ),
3511                                to_pane,
3512                            )
3513                        })
3514                    {
3515                        let opened_items: Vec<_> = open_task.await;
3516                        _ = workspace.update_in(cx, |workspace, window, cx| {
3517                            for item in opened_items.into_iter().flatten() {
3518                                if let Err(e) = item {
3519                                    workspace.show_error(&e, cx);
3520                                }
3521                            }
3522                            if to_pane.read(cx).items_len() == 0 {
3523                                workspace.remove_pane(to_pane, None, window, cx);
3524                            }
3525                        });
3526                    }
3527                })
3528                .detach();
3529            })
3530            .log_err();
3531    }
3532
3533    pub fn display_nav_history_buttons(&mut self, display: Option<bool>) {
3534        self.display_nav_history_buttons = display;
3535    }
3536
3537    fn pinned_item_ids(&self) -> Vec<EntityId> {
3538        self.items
3539            .iter()
3540            .enumerate()
3541            .filter_map(|(index, item)| {
3542                if self.is_tab_pinned(index) {
3543                    return Some(item.item_id());
3544                }
3545
3546                None
3547            })
3548            .collect()
3549    }
3550
3551    fn clean_item_ids(&self, cx: &mut Context<Pane>) -> Vec<EntityId> {
3552        self.items()
3553            .filter_map(|item| {
3554                if !item.is_dirty(cx) {
3555                    return Some(item.item_id());
3556                }
3557
3558                None
3559            })
3560            .collect()
3561    }
3562
3563    fn to_the_side_item_ids(&self, item_id: EntityId, side: Side) -> Vec<EntityId> {
3564        match side {
3565            Side::Left => self
3566                .items()
3567                .take_while(|item| item.item_id() != item_id)
3568                .map(|item| item.item_id())
3569                .collect(),
3570            Side::Right => self
3571                .items()
3572                .rev()
3573                .take_while(|item| item.item_id() != item_id)
3574                .map(|item| item.item_id())
3575                .collect(),
3576        }
3577    }
3578
3579    fn multibuffer_item_ids(&self, cx: &mut Context<Pane>) -> Vec<EntityId> {
3580        self.items()
3581            .filter(|item| item.buffer_kind(cx) == ItemBufferKind::Multibuffer)
3582            .map(|item| item.item_id())
3583            .collect()
3584    }
3585
3586    pub fn drag_split_direction(&self) -> Option<SplitDirection> {
3587        self.drag_split_direction
3588    }
3589
3590    pub fn set_zoom_out_on_close(&mut self, zoom_out_on_close: bool) {
3591        self.zoom_out_on_close = zoom_out_on_close;
3592    }
3593}
3594
3595fn default_render_tab_bar_buttons(
3596    pane: &mut Pane,
3597    window: &mut Window,
3598    cx: &mut Context<Pane>,
3599) -> (Option<AnyElement>, Option<AnyElement>) {
3600    if !pane.has_focus(window, cx) && !pane.context_menu_focused(window, cx) {
3601        return (None, None);
3602    }
3603    // Ideally we would return a vec of elements here to pass directly to the [TabBar]'s
3604    // `end_slot`, but due to needing a view here that isn't possible.
3605    let right_children = h_flex()
3606        // Instead we need to replicate the spacing from the [TabBar]'s `end_slot` here.
3607        .gap(DynamicSpacing::Base04.rems(cx))
3608        .child(
3609            PopoverMenu::new("pane-tab-bar-popover-menu")
3610                .trigger_with_tooltip(
3611                    IconButton::new("plus", IconName::Plus).icon_size(IconSize::Small),
3612                    Tooltip::text("New..."),
3613                )
3614                .anchor(Corner::TopRight)
3615                .with_handle(pane.new_item_context_menu_handle.clone())
3616                .menu(move |window, cx| {
3617                    Some(ContextMenu::build(window, cx, |menu, _, _| {
3618                        menu.action("New File", NewFile.boxed_clone())
3619                            .action("Open File", ToggleFileFinder::default().boxed_clone())
3620                            .separator()
3621                            .action(
3622                                "Search Project",
3623                                DeploySearch {
3624                                    replace_enabled: false,
3625                                    included_files: None,
3626                                    excluded_files: None,
3627                                }
3628                                .boxed_clone(),
3629                            )
3630                            .action("Search Symbols", ToggleProjectSymbols.boxed_clone())
3631                            .separator()
3632                            .action("New Terminal", NewTerminal.boxed_clone())
3633                    }))
3634                }),
3635        )
3636        .child(
3637            PopoverMenu::new("pane-tab-bar-split")
3638                .trigger_with_tooltip(
3639                    IconButton::new("split", IconName::Split).icon_size(IconSize::Small),
3640                    Tooltip::text("Split Pane"),
3641                )
3642                .anchor(Corner::TopRight)
3643                .with_handle(pane.split_item_context_menu_handle.clone())
3644                .menu(move |window, cx| {
3645                    ContextMenu::build(window, cx, |menu, _, _| {
3646                        menu.action("Split Right", SplitRight.boxed_clone())
3647                            .action("Split Left", SplitLeft.boxed_clone())
3648                            .action("Split Up", SplitUp.boxed_clone())
3649                            .action("Split Down", SplitDown.boxed_clone())
3650                    })
3651                    .into()
3652                }),
3653        )
3654        .child({
3655            let zoomed = pane.is_zoomed();
3656            IconButton::new("toggle_zoom", IconName::Maximize)
3657                .icon_size(IconSize::Small)
3658                .toggle_state(zoomed)
3659                .selected_icon(IconName::Minimize)
3660                .on_click(cx.listener(|pane, _, window, cx| {
3661                    pane.toggle_zoom(&crate::ToggleZoom, window, cx);
3662                }))
3663                .tooltip(move |window, cx| {
3664                    Tooltip::for_action(
3665                        if zoomed { "Zoom Out" } else { "Zoom In" },
3666                        &ToggleZoom,
3667                        window,
3668                        cx,
3669                    )
3670                })
3671        })
3672        .into_any_element()
3673        .into();
3674    (None, right_children)
3675}
3676
3677impl Focusable for Pane {
3678    fn focus_handle(&self, _cx: &App) -> FocusHandle {
3679        self.focus_handle.clone()
3680    }
3681}
3682
3683impl Render for Pane {
3684    fn render(&mut self, window: &mut Window, cx: &mut Context<Self>) -> impl IntoElement {
3685        let mut key_context = KeyContext::new_with_defaults();
3686        key_context.add("Pane");
3687        if self.active_item().is_none() {
3688            key_context.add("EmptyPane");
3689        }
3690
3691        let should_display_tab_bar = self.should_display_tab_bar.clone();
3692        let display_tab_bar = should_display_tab_bar(window, cx);
3693        let Some(project) = self.project.upgrade() else {
3694            return div().track_focus(&self.focus_handle(cx));
3695        };
3696        let is_local = project.read(cx).is_local();
3697
3698        v_flex()
3699            .key_context(key_context)
3700            .track_focus(&self.focus_handle(cx))
3701            .size_full()
3702            .flex_none()
3703            .overflow_hidden()
3704            .on_action(
3705                cx.listener(|pane, _: &SplitLeft, _, cx| pane.split(SplitDirection::Left, cx)),
3706            )
3707            .on_action(cx.listener(|pane, _: &SplitUp, _, cx| pane.split(SplitDirection::Up, cx)))
3708            .on_action(cx.listener(|pane, _: &SplitHorizontal, _, cx| {
3709                pane.split(SplitDirection::horizontal(cx), cx)
3710            }))
3711            .on_action(cx.listener(|pane, _: &SplitVertical, _, cx| {
3712                pane.split(SplitDirection::vertical(cx), cx)
3713            }))
3714            .on_action(
3715                cx.listener(|pane, _: &SplitRight, _, cx| pane.split(SplitDirection::Right, cx)),
3716            )
3717            .on_action(
3718                cx.listener(|pane, _: &SplitDown, _, cx| pane.split(SplitDirection::Down, cx)),
3719            )
3720            .on_action(cx.listener(|pane, _: &SplitAndMoveUp, _, cx| {
3721                pane.split_and_move(SplitDirection::Up, cx)
3722            }))
3723            .on_action(cx.listener(|pane, _: &SplitAndMoveDown, _, cx| {
3724                pane.split_and_move(SplitDirection::Down, cx)
3725            }))
3726            .on_action(cx.listener(|pane, _: &SplitAndMoveLeft, _, cx| {
3727                pane.split_and_move(SplitDirection::Left, cx)
3728            }))
3729            .on_action(cx.listener(|pane, _: &SplitAndMoveRight, _, cx| {
3730                pane.split_and_move(SplitDirection::Right, cx)
3731            }))
3732            .on_action(cx.listener(|_, _: &JoinIntoNext, _, cx| {
3733                cx.emit(Event::JoinIntoNext);
3734            }))
3735            .on_action(cx.listener(|_, _: &JoinAll, _, cx| {
3736                cx.emit(Event::JoinAll);
3737            }))
3738            .on_action(cx.listener(Pane::toggle_zoom))
3739            .on_action(cx.listener(Self::navigate_backward))
3740            .on_action(cx.listener(Self::navigate_forward))
3741            .on_action(
3742                cx.listener(|pane: &mut Pane, action: &ActivateItem, window, cx| {
3743                    pane.activate_item(
3744                        action.0.min(pane.items.len().saturating_sub(1)),
3745                        true,
3746                        true,
3747                        window,
3748                        cx,
3749                    );
3750                }),
3751            )
3752            .on_action(cx.listener(Self::alternate_file))
3753            .on_action(cx.listener(Self::activate_last_item))
3754            .on_action(cx.listener(Self::activate_previous_item))
3755            .on_action(cx.listener(Self::activate_next_item))
3756            .on_action(cx.listener(Self::swap_item_left))
3757            .on_action(cx.listener(Self::swap_item_right))
3758            .on_action(cx.listener(Self::toggle_pin_tab))
3759            .on_action(cx.listener(Self::unpin_all_tabs))
3760            .when(PreviewTabsSettings::get_global(cx).enabled, |this| {
3761                this.on_action(cx.listener(|pane: &mut Pane, _: &TogglePreviewTab, _, cx| {
3762                    if let Some(active_item_id) = pane.active_item().map(|i| i.item_id()) {
3763                        if pane.is_active_preview_item(active_item_id) {
3764                            pane.set_preview_item_id(None, cx);
3765                        } else {
3766                            pane.set_preview_item_id(Some(active_item_id), cx);
3767                        }
3768                    }
3769                }))
3770            })
3771            .on_action(
3772                cx.listener(|pane: &mut Self, action: &CloseActiveItem, window, cx| {
3773                    pane.close_active_item(action, window, cx)
3774                        .detach_and_log_err(cx)
3775                }),
3776            )
3777            .on_action(
3778                cx.listener(|pane: &mut Self, action: &CloseOtherItems, window, cx| {
3779                    pane.close_other_items(action, None, window, cx)
3780                        .detach_and_log_err(cx);
3781                }),
3782            )
3783            .on_action(
3784                cx.listener(|pane: &mut Self, action: &CloseCleanItems, window, cx| {
3785                    pane.close_clean_items(action, window, cx)
3786                        .detach_and_log_err(cx)
3787                }),
3788            )
3789            .on_action(cx.listener(
3790                |pane: &mut Self, action: &CloseItemsToTheLeft, window, cx| {
3791                    pane.close_items_to_the_left_by_id(None, action, window, cx)
3792                        .detach_and_log_err(cx)
3793                },
3794            ))
3795            .on_action(cx.listener(
3796                |pane: &mut Self, action: &CloseItemsToTheRight, window, cx| {
3797                    pane.close_items_to_the_right_by_id(None, action, window, cx)
3798                        .detach_and_log_err(cx)
3799                },
3800            ))
3801            .on_action(
3802                cx.listener(|pane: &mut Self, action: &CloseAllItems, window, cx| {
3803                    pane.close_all_items(action, window, cx)
3804                        .detach_and_log_err(cx)
3805                }),
3806            )
3807            .on_action(cx.listener(
3808                |pane: &mut Self, action: &CloseMultibufferItems, window, cx| {
3809                    pane.close_multibuffer_items(action, window, cx)
3810                        .detach_and_log_err(cx)
3811                },
3812            ))
3813            .on_action(
3814                cx.listener(|pane: &mut Self, action: &RevealInProjectPanel, _, cx| {
3815                    let entry_id = action
3816                        .entry_id
3817                        .map(ProjectEntryId::from_proto)
3818                        .or_else(|| pane.active_item()?.project_entry_ids(cx).first().copied());
3819                    if let Some(entry_id) = entry_id {
3820                        pane.project
3821                            .update(cx, |_, cx| {
3822                                cx.emit(project::Event::RevealInProjectPanel(entry_id))
3823                            })
3824                            .ok();
3825                    }
3826                }),
3827            )
3828            .on_action(cx.listener(|_, _: &menu::Cancel, window, cx| {
3829                if cx.stop_active_drag(window) {
3830                } else {
3831                    cx.propagate();
3832                }
3833            }))
3834            .when(self.active_item().is_some() && display_tab_bar, |pane| {
3835                pane.child((self.render_tab_bar.clone())(self, window, cx))
3836            })
3837            .child({
3838                let has_worktrees = project.read(cx).visible_worktrees(cx).next().is_some();
3839                // main content
3840                div()
3841                    .flex_1()
3842                    .relative()
3843                    .group("")
3844                    .overflow_hidden()
3845                    .on_drag_move::<DraggedTab>(cx.listener(Self::handle_drag_move))
3846                    .on_drag_move::<DraggedSelection>(cx.listener(Self::handle_drag_move))
3847                    .when(is_local, |div| {
3848                        div.on_drag_move::<ExternalPaths>(cx.listener(Self::handle_drag_move))
3849                    })
3850                    .map(|div| {
3851                        if let Some(item) = self.active_item() {
3852                            div.id("pane_placeholder")
3853                                .v_flex()
3854                                .size_full()
3855                                .overflow_hidden()
3856                                .child(self.toolbar.clone())
3857                                .child(item.to_any())
3858                        } else {
3859                            let placeholder = div
3860                                .id("pane_placeholder")
3861                                .h_flex()
3862                                .size_full()
3863                                .justify_center()
3864                                .on_click(cx.listener(
3865                                    move |this, event: &ClickEvent, window, cx| {
3866                                        if event.click_count() == 2 {
3867                                            window.dispatch_action(
3868                                                this.double_click_dispatch_action.boxed_clone(),
3869                                                cx,
3870                                            );
3871                                        }
3872                                    },
3873                                ));
3874                            if has_worktrees {
3875                                placeholder
3876                            } else {
3877                                placeholder.child(
3878                                    Label::new("Open a file or project to get started.")
3879                                        .color(Color::Muted),
3880                                )
3881                            }
3882                        }
3883                    })
3884                    .child(
3885                        // drag target
3886                        div()
3887                            .invisible()
3888                            .absolute()
3889                            .bg(cx.theme().colors().drop_target_background)
3890                            .group_drag_over::<DraggedTab>("", |style| style.visible())
3891                            .group_drag_over::<DraggedSelection>("", |style| style.visible())
3892                            .when(is_local, |div| {
3893                                div.group_drag_over::<ExternalPaths>("", |style| style.visible())
3894                            })
3895                            .when_some(self.can_drop_predicate.clone(), |this, p| {
3896                                this.can_drop(move |a, window, cx| p(a, window, cx))
3897                            })
3898                            .on_drop(cx.listener(move |this, dragged_tab, window, cx| {
3899                                this.handle_tab_drop(
3900                                    dragged_tab,
3901                                    this.active_item_index(),
3902                                    window,
3903                                    cx,
3904                                )
3905                            }))
3906                            .on_drop(cx.listener(
3907                                move |this, selection: &DraggedSelection, window, cx| {
3908                                    this.handle_dragged_selection_drop(selection, None, window, cx)
3909                                },
3910                            ))
3911                            .on_drop(cx.listener(move |this, paths, window, cx| {
3912                                this.handle_external_paths_drop(paths, window, cx)
3913                            }))
3914                            .map(|div| {
3915                                let size = DefiniteLength::Fraction(0.5);
3916                                match self.drag_split_direction {
3917                                    None => div.top_0().right_0().bottom_0().left_0(),
3918                                    Some(SplitDirection::Up) => {
3919                                        div.top_0().left_0().right_0().h(size)
3920                                    }
3921                                    Some(SplitDirection::Down) => {
3922                                        div.left_0().bottom_0().right_0().h(size)
3923                                    }
3924                                    Some(SplitDirection::Left) => {
3925                                        div.top_0().left_0().bottom_0().w(size)
3926                                    }
3927                                    Some(SplitDirection::Right) => {
3928                                        div.top_0().bottom_0().right_0().w(size)
3929                                    }
3930                                }
3931                            }),
3932                    )
3933            })
3934            .on_mouse_down(
3935                MouseButton::Navigate(NavigationDirection::Back),
3936                cx.listener(|pane, _, window, cx| {
3937                    if let Some(workspace) = pane.workspace.upgrade() {
3938                        let pane = cx.entity().downgrade();
3939                        window.defer(cx, move |window, cx| {
3940                            workspace.update(cx, |workspace, cx| {
3941                                workspace.go_back(pane, window, cx).detach_and_log_err(cx)
3942                            })
3943                        })
3944                    }
3945                }),
3946            )
3947            .on_mouse_down(
3948                MouseButton::Navigate(NavigationDirection::Forward),
3949                cx.listener(|pane, _, window, cx| {
3950                    if let Some(workspace) = pane.workspace.upgrade() {
3951                        let pane = cx.entity().downgrade();
3952                        window.defer(cx, move |window, cx| {
3953                            workspace.update(cx, |workspace, cx| {
3954                                workspace
3955                                    .go_forward(pane, window, cx)
3956                                    .detach_and_log_err(cx)
3957                            })
3958                        })
3959                    }
3960                }),
3961            )
3962    }
3963}
3964
3965impl ItemNavHistory {
3966    pub fn push<D: 'static + Send + Any>(&mut self, data: Option<D>, cx: &mut App) {
3967        if self
3968            .item
3969            .upgrade()
3970            .is_some_and(|item| item.include_in_nav_history())
3971        {
3972            self.history
3973                .push(data, self.item.clone(), self.is_preview, cx);
3974        }
3975    }
3976
3977    pub fn pop_backward(&mut self, cx: &mut App) -> Option<NavigationEntry> {
3978        self.history.pop(NavigationMode::GoingBack, cx)
3979    }
3980
3981    pub fn pop_forward(&mut self, cx: &mut App) -> Option<NavigationEntry> {
3982        self.history.pop(NavigationMode::GoingForward, cx)
3983    }
3984}
3985
3986impl NavHistory {
3987    pub fn for_each_entry(
3988        &self,
3989        cx: &App,
3990        mut f: impl FnMut(&NavigationEntry, (ProjectPath, Option<PathBuf>)),
3991    ) {
3992        let borrowed_history = self.0.lock();
3993        borrowed_history
3994            .forward_stack
3995            .iter()
3996            .chain(borrowed_history.backward_stack.iter())
3997            .chain(borrowed_history.closed_stack.iter())
3998            .for_each(|entry| {
3999                if let Some(project_and_abs_path) =
4000                    borrowed_history.paths_by_item.get(&entry.item.id())
4001                {
4002                    f(entry, project_and_abs_path.clone());
4003                } else if let Some(item) = entry.item.upgrade()
4004                    && let Some(path) = item.project_path(cx)
4005                {
4006                    f(entry, (path, None));
4007                }
4008            })
4009    }
4010
4011    pub fn set_mode(&mut self, mode: NavigationMode) {
4012        self.0.lock().mode = mode;
4013    }
4014
4015    pub fn mode(&self) -> NavigationMode {
4016        self.0.lock().mode
4017    }
4018
4019    pub fn disable(&mut self) {
4020        self.0.lock().mode = NavigationMode::Disabled;
4021    }
4022
4023    pub fn enable(&mut self) {
4024        self.0.lock().mode = NavigationMode::Normal;
4025    }
4026
4027    pub fn pop(&mut self, mode: NavigationMode, cx: &mut App) -> Option<NavigationEntry> {
4028        let mut state = self.0.lock();
4029        let entry = match mode {
4030            NavigationMode::Normal | NavigationMode::Disabled | NavigationMode::ClosingItem => {
4031                return None;
4032            }
4033            NavigationMode::GoingBack => &mut state.backward_stack,
4034            NavigationMode::GoingForward => &mut state.forward_stack,
4035            NavigationMode::ReopeningClosedItem => &mut state.closed_stack,
4036        }
4037        .pop_back();
4038        if entry.is_some() {
4039            state.did_update(cx);
4040        }
4041        entry
4042    }
4043
4044    pub fn push<D: 'static + Send + Any>(
4045        &mut self,
4046        data: Option<D>,
4047        item: Arc<dyn WeakItemHandle>,
4048        is_preview: bool,
4049        cx: &mut App,
4050    ) {
4051        let state = &mut *self.0.lock();
4052        match state.mode {
4053            NavigationMode::Disabled => {}
4054            NavigationMode::Normal | NavigationMode::ReopeningClosedItem => {
4055                if state.backward_stack.len() >= MAX_NAVIGATION_HISTORY_LEN {
4056                    state.backward_stack.pop_front();
4057                }
4058                state.backward_stack.push_back(NavigationEntry {
4059                    item,
4060                    data: data.map(|data| Box::new(data) as Box<dyn Any + Send>),
4061                    timestamp: state.next_timestamp.fetch_add(1, Ordering::SeqCst),
4062                    is_preview,
4063                });
4064                state.forward_stack.clear();
4065            }
4066            NavigationMode::GoingBack => {
4067                if state.forward_stack.len() >= MAX_NAVIGATION_HISTORY_LEN {
4068                    state.forward_stack.pop_front();
4069                }
4070                state.forward_stack.push_back(NavigationEntry {
4071                    item,
4072                    data: data.map(|data| Box::new(data) as Box<dyn Any + Send>),
4073                    timestamp: state.next_timestamp.fetch_add(1, Ordering::SeqCst),
4074                    is_preview,
4075                });
4076            }
4077            NavigationMode::GoingForward => {
4078                if state.backward_stack.len() >= MAX_NAVIGATION_HISTORY_LEN {
4079                    state.backward_stack.pop_front();
4080                }
4081                state.backward_stack.push_back(NavigationEntry {
4082                    item,
4083                    data: data.map(|data| Box::new(data) as Box<dyn Any + Send>),
4084                    timestamp: state.next_timestamp.fetch_add(1, Ordering::SeqCst),
4085                    is_preview,
4086                });
4087            }
4088            NavigationMode::ClosingItem => {
4089                if state.closed_stack.len() >= MAX_NAVIGATION_HISTORY_LEN {
4090                    state.closed_stack.pop_front();
4091                }
4092                state.closed_stack.push_back(NavigationEntry {
4093                    item,
4094                    data: data.map(|data| Box::new(data) as Box<dyn Any + Send>),
4095                    timestamp: state.next_timestamp.fetch_add(1, Ordering::SeqCst),
4096                    is_preview,
4097                });
4098            }
4099        }
4100        state.did_update(cx);
4101    }
4102
4103    pub fn remove_item(&mut self, item_id: EntityId) {
4104        let mut state = self.0.lock();
4105        state.paths_by_item.remove(&item_id);
4106        state
4107            .backward_stack
4108            .retain(|entry| entry.item.id() != item_id);
4109        state
4110            .forward_stack
4111            .retain(|entry| entry.item.id() != item_id);
4112        state
4113            .closed_stack
4114            .retain(|entry| entry.item.id() != item_id);
4115    }
4116
4117    pub fn path_for_item(&self, item_id: EntityId) -> Option<(ProjectPath, Option<PathBuf>)> {
4118        self.0.lock().paths_by_item.get(&item_id).cloned()
4119    }
4120}
4121
4122impl NavHistoryState {
4123    pub fn did_update(&self, cx: &mut App) {
4124        if let Some(pane) = self.pane.upgrade() {
4125            cx.defer(move |cx| {
4126                pane.update(cx, |pane, cx| pane.history_updated(cx));
4127            });
4128        }
4129    }
4130}
4131
4132fn dirty_message_for(buffer_path: Option<ProjectPath>, path_style: PathStyle) -> String {
4133    let path = buffer_path
4134        .as_ref()
4135        .and_then(|p| {
4136            let path = p.path.display(path_style);
4137            if path.is_empty() { None } else { Some(path) }
4138        })
4139        .unwrap_or("This buffer".into());
4140    let path = truncate_and_remove_front(&path, 80);
4141    format!("{path} contains unsaved edits. Do you want to save it?")
4142}
4143
4144pub fn tab_details(items: &[Box<dyn ItemHandle>], _window: &Window, cx: &App) -> Vec<usize> {
4145    let mut tab_details = items.iter().map(|_| 0).collect::<Vec<_>>();
4146    let mut tab_descriptions = HashMap::default();
4147    let mut done = false;
4148    while !done {
4149        done = true;
4150
4151        // Store item indices by their tab description.
4152        for (ix, (item, detail)) in items.iter().zip(&tab_details).enumerate() {
4153            let description = item.tab_content_text(*detail, cx);
4154            if *detail == 0 || description != item.tab_content_text(detail - 1, cx) {
4155                tab_descriptions
4156                    .entry(description)
4157                    .or_insert(Vec::new())
4158                    .push(ix);
4159            }
4160        }
4161
4162        // If two or more items have the same tab description, increase their level
4163        // of detail and try again.
4164        for (_, item_ixs) in tab_descriptions.drain() {
4165            if item_ixs.len() > 1 {
4166                done = false;
4167                for ix in item_ixs {
4168                    tab_details[ix] += 1;
4169                }
4170            }
4171        }
4172    }
4173
4174    tab_details
4175}
4176
4177pub fn render_item_indicator(item: Box<dyn ItemHandle>, cx: &App) -> Option<Indicator> {
4178    maybe!({
4179        let indicator_color = match (item.has_conflict(cx), item.is_dirty(cx)) {
4180            (true, _) => Color::Warning,
4181            (_, true) => Color::Accent,
4182            (false, false) => return None,
4183        };
4184
4185        Some(Indicator::dot().color(indicator_color))
4186    })
4187}
4188
4189impl Render for DraggedTab {
4190    fn render(&mut self, window: &mut Window, cx: &mut Context<Self>) -> impl IntoElement {
4191        let ui_font = ThemeSettings::get_global(cx).ui_font.clone();
4192        let label = self.item.tab_content(
4193            TabContentParams {
4194                detail: Some(self.detail),
4195                selected: false,
4196                preview: false,
4197                deemphasized: false,
4198            },
4199            window,
4200            cx,
4201        );
4202        Tab::new("")
4203            .toggle_state(self.is_active)
4204            .child(label)
4205            .render(window, cx)
4206            .font(ui_font)
4207    }
4208}
4209
4210#[cfg(test)]
4211mod tests {
4212    use std::num::NonZero;
4213
4214    use super::*;
4215    use crate::item::test::{TestItem, TestProjectItem};
4216    use gpui::{TestAppContext, VisualTestContext, size};
4217    use project::FakeFs;
4218    use settings::SettingsStore;
4219    use theme::LoadThemes;
4220    use util::TryFutureExt;
4221
4222    #[gpui::test]
4223    async fn test_add_item_capped_to_max_tabs(cx: &mut TestAppContext) {
4224        init_test(cx);
4225        let fs = FakeFs::new(cx.executor());
4226
4227        let project = Project::test(fs, None, cx).await;
4228        let (workspace, cx) =
4229            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
4230        let pane = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
4231
4232        for i in 0..7 {
4233            add_labeled_item(&pane, format!("{}", i).as_str(), false, cx);
4234        }
4235
4236        set_max_tabs(cx, Some(5));
4237        add_labeled_item(&pane, "7", false, cx);
4238        // Remove items to respect the max tab cap.
4239        assert_item_labels(&pane, ["3", "4", "5", "6", "7*"], cx);
4240        pane.update_in(cx, |pane, window, cx| {
4241            pane.activate_item(0, false, false, window, cx);
4242        });
4243        add_labeled_item(&pane, "X", false, cx);
4244        // Respect activation order.
4245        assert_item_labels(&pane, ["3", "X*", "5", "6", "7"], cx);
4246
4247        for i in 0..7 {
4248            add_labeled_item(&pane, format!("D{}", i).as_str(), true, cx);
4249        }
4250        // Keeps dirty items, even over max tab cap.
4251        assert_item_labels(
4252            &pane,
4253            ["D0^", "D1^", "D2^", "D3^", "D4^", "D5^", "D6*^"],
4254            cx,
4255        );
4256
4257        set_max_tabs(cx, None);
4258        for i in 0..7 {
4259            add_labeled_item(&pane, format!("N{}", i).as_str(), false, cx);
4260        }
4261        // No cap when max tabs is None.
4262        assert_item_labels(
4263            &pane,
4264            [
4265                "D0^", "D1^", "D2^", "D3^", "D4^", "D5^", "D6^", "N0", "N1", "N2", "N3", "N4",
4266                "N5", "N6*",
4267            ],
4268            cx,
4269        );
4270    }
4271
4272    #[gpui::test]
4273    async fn test_reduce_max_tabs_closes_existing_items(cx: &mut TestAppContext) {
4274        init_test(cx);
4275        let fs = FakeFs::new(cx.executor());
4276
4277        let project = Project::test(fs, None, cx).await;
4278        let (workspace, cx) =
4279            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
4280        let pane = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
4281
4282        add_labeled_item(&pane, "A", false, cx);
4283        add_labeled_item(&pane, "B", false, cx);
4284        let item_c = add_labeled_item(&pane, "C", false, cx);
4285        let item_d = add_labeled_item(&pane, "D", false, cx);
4286        add_labeled_item(&pane, "E", false, cx);
4287        add_labeled_item(&pane, "Settings", false, cx);
4288        assert_item_labels(&pane, ["A", "B", "C", "D", "E", "Settings*"], cx);
4289
4290        set_max_tabs(cx, Some(5));
4291        assert_item_labels(&pane, ["B", "C", "D", "E", "Settings*"], cx);
4292
4293        set_max_tabs(cx, Some(4));
4294        assert_item_labels(&pane, ["C", "D", "E", "Settings*"], cx);
4295
4296        pane.update_in(cx, |pane, window, cx| {
4297            let ix = pane.index_for_item_id(item_c.item_id()).unwrap();
4298            pane.pin_tab_at(ix, window, cx);
4299
4300            let ix = pane.index_for_item_id(item_d.item_id()).unwrap();
4301            pane.pin_tab_at(ix, window, cx);
4302        });
4303        assert_item_labels(&pane, ["C!", "D!", "E", "Settings*"], cx);
4304
4305        set_max_tabs(cx, Some(2));
4306        assert_item_labels(&pane, ["C!", "D!", "Settings*"], cx);
4307    }
4308
4309    #[gpui::test]
4310    async fn test_allow_pinning_dirty_item_at_max_tabs(cx: &mut TestAppContext) {
4311        init_test(cx);
4312        let fs = FakeFs::new(cx.executor());
4313
4314        let project = Project::test(fs, None, cx).await;
4315        let (workspace, cx) =
4316            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
4317        let pane = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
4318
4319        set_max_tabs(cx, Some(1));
4320        let item_a = add_labeled_item(&pane, "A", true, cx);
4321
4322        pane.update_in(cx, |pane, window, cx| {
4323            let ix = pane.index_for_item_id(item_a.item_id()).unwrap();
4324            pane.pin_tab_at(ix, window, cx);
4325        });
4326        assert_item_labels(&pane, ["A*^!"], cx);
4327    }
4328
4329    #[gpui::test]
4330    async fn test_allow_pinning_non_dirty_item_at_max_tabs(cx: &mut TestAppContext) {
4331        init_test(cx);
4332        let fs = FakeFs::new(cx.executor());
4333
4334        let project = Project::test(fs, None, cx).await;
4335        let (workspace, cx) =
4336            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
4337        let pane = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
4338
4339        set_max_tabs(cx, Some(1));
4340        let item_a = add_labeled_item(&pane, "A", false, cx);
4341
4342        pane.update_in(cx, |pane, window, cx| {
4343            let ix = pane.index_for_item_id(item_a.item_id()).unwrap();
4344            pane.pin_tab_at(ix, window, cx);
4345        });
4346        assert_item_labels(&pane, ["A*!"], cx);
4347    }
4348
4349    #[gpui::test]
4350    async fn test_pin_tabs_incrementally_at_max_capacity(cx: &mut TestAppContext) {
4351        init_test(cx);
4352        let fs = FakeFs::new(cx.executor());
4353
4354        let project = Project::test(fs, None, cx).await;
4355        let (workspace, cx) =
4356            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
4357        let pane = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
4358
4359        set_max_tabs(cx, Some(3));
4360
4361        let item_a = add_labeled_item(&pane, "A", false, cx);
4362        assert_item_labels(&pane, ["A*"], cx);
4363
4364        pane.update_in(cx, |pane, window, cx| {
4365            let ix = pane.index_for_item_id(item_a.item_id()).unwrap();
4366            pane.pin_tab_at(ix, window, cx);
4367        });
4368        assert_item_labels(&pane, ["A*!"], cx);
4369
4370        let item_b = add_labeled_item(&pane, "B", false, cx);
4371        assert_item_labels(&pane, ["A!", "B*"], cx);
4372
4373        pane.update_in(cx, |pane, window, cx| {
4374            let ix = pane.index_for_item_id(item_b.item_id()).unwrap();
4375            pane.pin_tab_at(ix, window, cx);
4376        });
4377        assert_item_labels(&pane, ["A!", "B*!"], cx);
4378
4379        let item_c = add_labeled_item(&pane, "C", false, cx);
4380        assert_item_labels(&pane, ["A!", "B!", "C*"], cx);
4381
4382        pane.update_in(cx, |pane, window, cx| {
4383            let ix = pane.index_for_item_id(item_c.item_id()).unwrap();
4384            pane.pin_tab_at(ix, window, cx);
4385        });
4386        assert_item_labels(&pane, ["A!", "B!", "C*!"], cx);
4387    }
4388
4389    #[gpui::test]
4390    async fn test_pin_tabs_left_to_right_after_opening_at_max_capacity(cx: &mut TestAppContext) {
4391        init_test(cx);
4392        let fs = FakeFs::new(cx.executor());
4393
4394        let project = Project::test(fs, None, cx).await;
4395        let (workspace, cx) =
4396            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
4397        let pane = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
4398
4399        set_max_tabs(cx, Some(3));
4400
4401        let item_a = add_labeled_item(&pane, "A", false, cx);
4402        assert_item_labels(&pane, ["A*"], cx);
4403
4404        let item_b = add_labeled_item(&pane, "B", false, cx);
4405        assert_item_labels(&pane, ["A", "B*"], cx);
4406
4407        let item_c = add_labeled_item(&pane, "C", false, cx);
4408        assert_item_labels(&pane, ["A", "B", "C*"], cx);
4409
4410        pane.update_in(cx, |pane, window, cx| {
4411            let ix = pane.index_for_item_id(item_a.item_id()).unwrap();
4412            pane.pin_tab_at(ix, window, cx);
4413        });
4414        assert_item_labels(&pane, ["A!", "B", "C*"], cx);
4415
4416        pane.update_in(cx, |pane, window, cx| {
4417            let ix = pane.index_for_item_id(item_b.item_id()).unwrap();
4418            pane.pin_tab_at(ix, window, cx);
4419        });
4420        assert_item_labels(&pane, ["A!", "B!", "C*"], cx);
4421
4422        pane.update_in(cx, |pane, window, cx| {
4423            let ix = pane.index_for_item_id(item_c.item_id()).unwrap();
4424            pane.pin_tab_at(ix, window, cx);
4425        });
4426        assert_item_labels(&pane, ["A!", "B!", "C*!"], cx);
4427    }
4428
4429    #[gpui::test]
4430    async fn test_pin_tabs_right_to_left_after_opening_at_max_capacity(cx: &mut TestAppContext) {
4431        init_test(cx);
4432        let fs = FakeFs::new(cx.executor());
4433
4434        let project = Project::test(fs, None, cx).await;
4435        let (workspace, cx) =
4436            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
4437        let pane = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
4438
4439        set_max_tabs(cx, Some(3));
4440
4441        let item_a = add_labeled_item(&pane, "A", false, cx);
4442        assert_item_labels(&pane, ["A*"], cx);
4443
4444        let item_b = add_labeled_item(&pane, "B", false, cx);
4445        assert_item_labels(&pane, ["A", "B*"], cx);
4446
4447        let item_c = add_labeled_item(&pane, "C", false, cx);
4448        assert_item_labels(&pane, ["A", "B", "C*"], cx);
4449
4450        pane.update_in(cx, |pane, window, cx| {
4451            let ix = pane.index_for_item_id(item_c.item_id()).unwrap();
4452            pane.pin_tab_at(ix, window, cx);
4453        });
4454        assert_item_labels(&pane, ["C*!", "A", "B"], cx);
4455
4456        pane.update_in(cx, |pane, window, cx| {
4457            let ix = pane.index_for_item_id(item_b.item_id()).unwrap();
4458            pane.pin_tab_at(ix, window, cx);
4459        });
4460        assert_item_labels(&pane, ["C*!", "B!", "A"], cx);
4461
4462        pane.update_in(cx, |pane, window, cx| {
4463            let ix = pane.index_for_item_id(item_a.item_id()).unwrap();
4464            pane.pin_tab_at(ix, window, cx);
4465        });
4466        assert_item_labels(&pane, ["C*!", "B!", "A!"], cx);
4467    }
4468
4469    #[gpui::test]
4470    async fn test_pinned_tabs_never_closed_at_max_tabs(cx: &mut TestAppContext) {
4471        init_test(cx);
4472        let fs = FakeFs::new(cx.executor());
4473
4474        let project = Project::test(fs, None, cx).await;
4475        let (workspace, cx) =
4476            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
4477        let pane = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
4478
4479        let item_a = add_labeled_item(&pane, "A", false, cx);
4480        pane.update_in(cx, |pane, window, cx| {
4481            let ix = pane.index_for_item_id(item_a.item_id()).unwrap();
4482            pane.pin_tab_at(ix, window, cx);
4483        });
4484
4485        let item_b = add_labeled_item(&pane, "B", false, cx);
4486        pane.update_in(cx, |pane, window, cx| {
4487            let ix = pane.index_for_item_id(item_b.item_id()).unwrap();
4488            pane.pin_tab_at(ix, window, cx);
4489        });
4490
4491        add_labeled_item(&pane, "C", false, cx);
4492        add_labeled_item(&pane, "D", false, cx);
4493        add_labeled_item(&pane, "E", false, cx);
4494        assert_item_labels(&pane, ["A!", "B!", "C", "D", "E*"], cx);
4495
4496        set_max_tabs(cx, Some(3));
4497        add_labeled_item(&pane, "F", false, cx);
4498        assert_item_labels(&pane, ["A!", "B!", "F*"], cx);
4499
4500        add_labeled_item(&pane, "G", false, cx);
4501        assert_item_labels(&pane, ["A!", "B!", "G*"], cx);
4502
4503        add_labeled_item(&pane, "H", false, cx);
4504        assert_item_labels(&pane, ["A!", "B!", "H*"], cx);
4505    }
4506
4507    #[gpui::test]
4508    async fn test_always_allows_one_unpinned_item_over_max_tabs_regardless_of_pinned_count(
4509        cx: &mut TestAppContext,
4510    ) {
4511        init_test(cx);
4512        let fs = FakeFs::new(cx.executor());
4513
4514        let project = Project::test(fs, None, cx).await;
4515        let (workspace, cx) =
4516            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
4517        let pane = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
4518
4519        set_max_tabs(cx, Some(3));
4520
4521        let item_a = add_labeled_item(&pane, "A", false, cx);
4522        pane.update_in(cx, |pane, window, cx| {
4523            let ix = pane.index_for_item_id(item_a.item_id()).unwrap();
4524            pane.pin_tab_at(ix, window, cx);
4525        });
4526
4527        let item_b = add_labeled_item(&pane, "B", false, cx);
4528        pane.update_in(cx, |pane, window, cx| {
4529            let ix = pane.index_for_item_id(item_b.item_id()).unwrap();
4530            pane.pin_tab_at(ix, window, cx);
4531        });
4532
4533        let item_c = add_labeled_item(&pane, "C", false, cx);
4534        pane.update_in(cx, |pane, window, cx| {
4535            let ix = pane.index_for_item_id(item_c.item_id()).unwrap();
4536            pane.pin_tab_at(ix, window, cx);
4537        });
4538
4539        assert_item_labels(&pane, ["A!", "B!", "C*!"], cx);
4540
4541        let item_d = add_labeled_item(&pane, "D", false, cx);
4542        assert_item_labels(&pane, ["A!", "B!", "C!", "D*"], cx);
4543
4544        pane.update_in(cx, |pane, window, cx| {
4545            let ix = pane.index_for_item_id(item_d.item_id()).unwrap();
4546            pane.pin_tab_at(ix, window, cx);
4547        });
4548        assert_item_labels(&pane, ["A!", "B!", "C!", "D*!"], cx);
4549
4550        add_labeled_item(&pane, "E", false, cx);
4551        assert_item_labels(&pane, ["A!", "B!", "C!", "D!", "E*"], cx);
4552
4553        add_labeled_item(&pane, "F", false, cx);
4554        assert_item_labels(&pane, ["A!", "B!", "C!", "D!", "F*"], cx);
4555    }
4556
4557    #[gpui::test]
4558    async fn test_can_open_one_item_when_all_tabs_are_dirty_at_max(cx: &mut TestAppContext) {
4559        init_test(cx);
4560        let fs = FakeFs::new(cx.executor());
4561
4562        let project = Project::test(fs, None, cx).await;
4563        let (workspace, cx) =
4564            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
4565        let pane = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
4566
4567        set_max_tabs(cx, Some(3));
4568
4569        add_labeled_item(&pane, "A", true, cx);
4570        assert_item_labels(&pane, ["A*^"], cx);
4571
4572        add_labeled_item(&pane, "B", true, cx);
4573        assert_item_labels(&pane, ["A^", "B*^"], cx);
4574
4575        add_labeled_item(&pane, "C", true, cx);
4576        assert_item_labels(&pane, ["A^", "B^", "C*^"], cx);
4577
4578        add_labeled_item(&pane, "D", false, cx);
4579        assert_item_labels(&pane, ["A^", "B^", "C^", "D*"], cx);
4580
4581        add_labeled_item(&pane, "E", false, cx);
4582        assert_item_labels(&pane, ["A^", "B^", "C^", "E*"], cx);
4583
4584        add_labeled_item(&pane, "F", false, cx);
4585        assert_item_labels(&pane, ["A^", "B^", "C^", "F*"], cx);
4586
4587        add_labeled_item(&pane, "G", true, cx);
4588        assert_item_labels(&pane, ["A^", "B^", "C^", "G*^"], cx);
4589    }
4590
4591    #[gpui::test]
4592    async fn test_toggle_pin_tab(cx: &mut TestAppContext) {
4593        init_test(cx);
4594        let fs = FakeFs::new(cx.executor());
4595
4596        let project = Project::test(fs, None, cx).await;
4597        let (workspace, cx) =
4598            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
4599        let pane = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
4600
4601        set_labeled_items(&pane, ["A", "B*", "C"], cx);
4602        assert_item_labels(&pane, ["A", "B*", "C"], cx);
4603
4604        pane.update_in(cx, |pane, window, cx| {
4605            pane.toggle_pin_tab(&TogglePinTab, window, cx);
4606        });
4607        assert_item_labels(&pane, ["B*!", "A", "C"], cx);
4608
4609        pane.update_in(cx, |pane, window, cx| {
4610            pane.toggle_pin_tab(&TogglePinTab, window, cx);
4611        });
4612        assert_item_labels(&pane, ["B*", "A", "C"], cx);
4613    }
4614
4615    #[gpui::test]
4616    async fn test_unpin_all_tabs(cx: &mut TestAppContext) {
4617        init_test(cx);
4618        let fs = FakeFs::new(cx.executor());
4619
4620        let project = Project::test(fs, None, cx).await;
4621        let (workspace, cx) =
4622            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
4623        let pane = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
4624
4625        // Unpin all, in an empty pane
4626        pane.update_in(cx, |pane, window, cx| {
4627            pane.unpin_all_tabs(&UnpinAllTabs, window, cx);
4628        });
4629
4630        assert_item_labels(&pane, [], cx);
4631
4632        let item_a = add_labeled_item(&pane, "A", false, cx);
4633        let item_b = add_labeled_item(&pane, "B", false, cx);
4634        let item_c = add_labeled_item(&pane, "C", false, cx);
4635        assert_item_labels(&pane, ["A", "B", "C*"], cx);
4636
4637        // Unpin all, when no tabs are pinned
4638        pane.update_in(cx, |pane, window, cx| {
4639            pane.unpin_all_tabs(&UnpinAllTabs, window, cx);
4640        });
4641
4642        assert_item_labels(&pane, ["A", "B", "C*"], cx);
4643
4644        // Pin inactive tabs only
4645        pane.update_in(cx, |pane, window, cx| {
4646            let ix = pane.index_for_item_id(item_a.item_id()).unwrap();
4647            pane.pin_tab_at(ix, window, cx);
4648
4649            let ix = pane.index_for_item_id(item_b.item_id()).unwrap();
4650            pane.pin_tab_at(ix, window, cx);
4651        });
4652        assert_item_labels(&pane, ["A!", "B!", "C*"], cx);
4653
4654        pane.update_in(cx, |pane, window, cx| {
4655            pane.unpin_all_tabs(&UnpinAllTabs, window, cx);
4656        });
4657
4658        assert_item_labels(&pane, ["A", "B", "C*"], cx);
4659
4660        // Pin all tabs
4661        pane.update_in(cx, |pane, window, cx| {
4662            let ix = pane.index_for_item_id(item_a.item_id()).unwrap();
4663            pane.pin_tab_at(ix, window, cx);
4664
4665            let ix = pane.index_for_item_id(item_b.item_id()).unwrap();
4666            pane.pin_tab_at(ix, window, cx);
4667
4668            let ix = pane.index_for_item_id(item_c.item_id()).unwrap();
4669            pane.pin_tab_at(ix, window, cx);
4670        });
4671        assert_item_labels(&pane, ["A!", "B!", "C*!"], cx);
4672
4673        // Activate middle tab
4674        pane.update_in(cx, |pane, window, cx| {
4675            pane.activate_item(1, false, false, window, cx);
4676        });
4677        assert_item_labels(&pane, ["A!", "B*!", "C!"], cx);
4678
4679        pane.update_in(cx, |pane, window, cx| {
4680            pane.unpin_all_tabs(&UnpinAllTabs, window, cx);
4681        });
4682
4683        // Order has not changed
4684        assert_item_labels(&pane, ["A", "B*", "C"], cx);
4685    }
4686
4687    #[gpui::test]
4688    async fn test_pinning_active_tab_without_position_change_maintains_focus(
4689        cx: &mut TestAppContext,
4690    ) {
4691        init_test(cx);
4692        let fs = FakeFs::new(cx.executor());
4693
4694        let project = Project::test(fs, None, cx).await;
4695        let (workspace, cx) =
4696            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
4697        let pane = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
4698
4699        // Add A
4700        let item_a = add_labeled_item(&pane, "A", false, cx);
4701        assert_item_labels(&pane, ["A*"], cx);
4702
4703        // Add B
4704        add_labeled_item(&pane, "B", false, cx);
4705        assert_item_labels(&pane, ["A", "B*"], cx);
4706
4707        // Activate A again
4708        pane.update_in(cx, |pane, window, cx| {
4709            let ix = pane.index_for_item_id(item_a.item_id()).unwrap();
4710            pane.activate_item(ix, true, true, window, cx);
4711        });
4712        assert_item_labels(&pane, ["A*", "B"], cx);
4713
4714        // Pin A - remains active
4715        pane.update_in(cx, |pane, window, cx| {
4716            let ix = pane.index_for_item_id(item_a.item_id()).unwrap();
4717            pane.pin_tab_at(ix, window, cx);
4718        });
4719        assert_item_labels(&pane, ["A*!", "B"], cx);
4720
4721        // Unpin A - remain active
4722        pane.update_in(cx, |pane, window, cx| {
4723            let ix = pane.index_for_item_id(item_a.item_id()).unwrap();
4724            pane.unpin_tab_at(ix, window, cx);
4725        });
4726        assert_item_labels(&pane, ["A*", "B"], cx);
4727    }
4728
4729    #[gpui::test]
4730    async fn test_pinning_active_tab_with_position_change_maintains_focus(cx: &mut TestAppContext) {
4731        init_test(cx);
4732        let fs = FakeFs::new(cx.executor());
4733
4734        let project = Project::test(fs, None, cx).await;
4735        let (workspace, cx) =
4736            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
4737        let pane = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
4738
4739        // Add A, B, C
4740        add_labeled_item(&pane, "A", false, cx);
4741        add_labeled_item(&pane, "B", false, cx);
4742        let item_c = add_labeled_item(&pane, "C", false, cx);
4743        assert_item_labels(&pane, ["A", "B", "C*"], cx);
4744
4745        // Pin C - moves to pinned area, remains active
4746        pane.update_in(cx, |pane, window, cx| {
4747            let ix = pane.index_for_item_id(item_c.item_id()).unwrap();
4748            pane.pin_tab_at(ix, window, cx);
4749        });
4750        assert_item_labels(&pane, ["C*!", "A", "B"], cx);
4751
4752        // Unpin C - moves after pinned area, remains active
4753        pane.update_in(cx, |pane, window, cx| {
4754            let ix = pane.index_for_item_id(item_c.item_id()).unwrap();
4755            pane.unpin_tab_at(ix, window, cx);
4756        });
4757        assert_item_labels(&pane, ["C*", "A", "B"], cx);
4758    }
4759
4760    #[gpui::test]
4761    async fn test_pinning_inactive_tab_without_position_change_preserves_existing_focus(
4762        cx: &mut TestAppContext,
4763    ) {
4764        init_test(cx);
4765        let fs = FakeFs::new(cx.executor());
4766
4767        let project = Project::test(fs, None, cx).await;
4768        let (workspace, cx) =
4769            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
4770        let pane = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
4771
4772        // Add A, B
4773        let item_a = add_labeled_item(&pane, "A", false, cx);
4774        add_labeled_item(&pane, "B", false, cx);
4775        assert_item_labels(&pane, ["A", "B*"], cx);
4776
4777        // Pin A - already in pinned area, B remains active
4778        pane.update_in(cx, |pane, window, cx| {
4779            let ix = pane.index_for_item_id(item_a.item_id()).unwrap();
4780            pane.pin_tab_at(ix, window, cx);
4781        });
4782        assert_item_labels(&pane, ["A!", "B*"], cx);
4783
4784        // Unpin A - stays in place, B remains active
4785        pane.update_in(cx, |pane, window, cx| {
4786            let ix = pane.index_for_item_id(item_a.item_id()).unwrap();
4787            pane.unpin_tab_at(ix, window, cx);
4788        });
4789        assert_item_labels(&pane, ["A", "B*"], cx);
4790    }
4791
4792    #[gpui::test]
4793    async fn test_pinning_inactive_tab_with_position_change_preserves_existing_focus(
4794        cx: &mut TestAppContext,
4795    ) {
4796        init_test(cx);
4797        let fs = FakeFs::new(cx.executor());
4798
4799        let project = Project::test(fs, None, cx).await;
4800        let (workspace, cx) =
4801            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
4802        let pane = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
4803
4804        // Add A, B, C
4805        add_labeled_item(&pane, "A", false, cx);
4806        let item_b = add_labeled_item(&pane, "B", false, cx);
4807        let item_c = add_labeled_item(&pane, "C", false, cx);
4808        assert_item_labels(&pane, ["A", "B", "C*"], cx);
4809
4810        // Activate B
4811        pane.update_in(cx, |pane, window, cx| {
4812            let ix = pane.index_for_item_id(item_b.item_id()).unwrap();
4813            pane.activate_item(ix, true, true, window, cx);
4814        });
4815        assert_item_labels(&pane, ["A", "B*", "C"], cx);
4816
4817        // Pin C - moves to pinned area, B remains active
4818        pane.update_in(cx, |pane, window, cx| {
4819            let ix = pane.index_for_item_id(item_c.item_id()).unwrap();
4820            pane.pin_tab_at(ix, window, cx);
4821        });
4822        assert_item_labels(&pane, ["C!", "A", "B*"], cx);
4823
4824        // Unpin C - moves after pinned area, B remains active
4825        pane.update_in(cx, |pane, window, cx| {
4826            let ix = pane.index_for_item_id(item_c.item_id()).unwrap();
4827            pane.unpin_tab_at(ix, window, cx);
4828        });
4829        assert_item_labels(&pane, ["C", "A", "B*"], cx);
4830    }
4831
4832    #[gpui::test]
4833    async fn test_drag_unpinned_tab_to_split_creates_pane_with_unpinned_tab(
4834        cx: &mut TestAppContext,
4835    ) {
4836        init_test(cx);
4837        let fs = FakeFs::new(cx.executor());
4838
4839        let project = Project::test(fs, None, cx).await;
4840        let (workspace, cx) =
4841            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
4842        let pane_a = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
4843
4844        // Add A, B. Pin B. Activate A
4845        let item_a = add_labeled_item(&pane_a, "A", false, cx);
4846        let item_b = add_labeled_item(&pane_a, "B", false, cx);
4847
4848        pane_a.update_in(cx, |pane, window, cx| {
4849            let ix = pane.index_for_item_id(item_b.item_id()).unwrap();
4850            pane.pin_tab_at(ix, window, cx);
4851
4852            let ix = pane.index_for_item_id(item_a.item_id()).unwrap();
4853            pane.activate_item(ix, true, true, window, cx);
4854        });
4855
4856        // Drag A to create new split
4857        pane_a.update_in(cx, |pane, window, cx| {
4858            pane.drag_split_direction = Some(SplitDirection::Right);
4859
4860            let dragged_tab = DraggedTab {
4861                pane: pane_a.clone(),
4862                item: item_a.boxed_clone(),
4863                ix: 0,
4864                detail: 0,
4865                is_active: true,
4866            };
4867            pane.handle_tab_drop(&dragged_tab, 0, window, cx);
4868        });
4869
4870        // A should be moved to new pane. B should remain pinned, A should not be pinned
4871        let (pane_a, pane_b) = workspace.read_with(cx, |workspace, _| {
4872            let panes = workspace.panes();
4873            (panes[0].clone(), panes[1].clone())
4874        });
4875        assert_item_labels(&pane_a, ["B*!"], cx);
4876        assert_item_labels(&pane_b, ["A*"], cx);
4877    }
4878
4879    #[gpui::test]
4880    async fn test_drag_pinned_tab_to_split_creates_pane_with_pinned_tab(cx: &mut TestAppContext) {
4881        init_test(cx);
4882        let fs = FakeFs::new(cx.executor());
4883
4884        let project = Project::test(fs, None, cx).await;
4885        let (workspace, cx) =
4886            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
4887        let pane_a = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
4888
4889        // Add A, B. Pin both. Activate A
4890        let item_a = add_labeled_item(&pane_a, "A", false, cx);
4891        let item_b = add_labeled_item(&pane_a, "B", false, cx);
4892
4893        pane_a.update_in(cx, |pane, window, cx| {
4894            let ix = pane.index_for_item_id(item_a.item_id()).unwrap();
4895            pane.pin_tab_at(ix, window, cx);
4896
4897            let ix = pane.index_for_item_id(item_b.item_id()).unwrap();
4898            pane.pin_tab_at(ix, window, cx);
4899
4900            let ix = pane.index_for_item_id(item_a.item_id()).unwrap();
4901            pane.activate_item(ix, true, true, window, cx);
4902        });
4903        assert_item_labels(&pane_a, ["A*!", "B!"], cx);
4904
4905        // Drag A to create new split
4906        pane_a.update_in(cx, |pane, window, cx| {
4907            pane.drag_split_direction = Some(SplitDirection::Right);
4908
4909            let dragged_tab = DraggedTab {
4910                pane: pane_a.clone(),
4911                item: item_a.boxed_clone(),
4912                ix: 0,
4913                detail: 0,
4914                is_active: true,
4915            };
4916            pane.handle_tab_drop(&dragged_tab, 0, window, cx);
4917        });
4918
4919        // A should be moved to new pane. Both A and B should still be pinned
4920        let (pane_a, pane_b) = workspace.read_with(cx, |workspace, _| {
4921            let panes = workspace.panes();
4922            (panes[0].clone(), panes[1].clone())
4923        });
4924        assert_item_labels(&pane_a, ["B*!"], cx);
4925        assert_item_labels(&pane_b, ["A*!"], cx);
4926    }
4927
4928    #[gpui::test]
4929    async fn test_drag_pinned_tab_into_existing_panes_pinned_region(cx: &mut TestAppContext) {
4930        init_test(cx);
4931        let fs = FakeFs::new(cx.executor());
4932
4933        let project = Project::test(fs, None, cx).await;
4934        let (workspace, cx) =
4935            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
4936        let pane_a = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
4937
4938        // Add A to pane A and pin
4939        let item_a = add_labeled_item(&pane_a, "A", false, cx);
4940        pane_a.update_in(cx, |pane, window, cx| {
4941            let ix = pane.index_for_item_id(item_a.item_id()).unwrap();
4942            pane.pin_tab_at(ix, window, cx);
4943        });
4944        assert_item_labels(&pane_a, ["A*!"], cx);
4945
4946        // Add B to pane B and pin
4947        let pane_b = workspace.update_in(cx, |workspace, window, cx| {
4948            workspace.split_pane(pane_a.clone(), SplitDirection::Right, window, cx)
4949        });
4950        let item_b = add_labeled_item(&pane_b, "B", false, cx);
4951        pane_b.update_in(cx, |pane, window, cx| {
4952            let ix = pane.index_for_item_id(item_b.item_id()).unwrap();
4953            pane.pin_tab_at(ix, window, cx);
4954        });
4955        assert_item_labels(&pane_b, ["B*!"], cx);
4956
4957        // Move A from pane A to pane B's pinned region
4958        pane_b.update_in(cx, |pane, window, cx| {
4959            let dragged_tab = DraggedTab {
4960                pane: pane_a.clone(),
4961                item: item_a.boxed_clone(),
4962                ix: 0,
4963                detail: 0,
4964                is_active: true,
4965            };
4966            pane.handle_tab_drop(&dragged_tab, 0, window, cx);
4967        });
4968
4969        // A should stay pinned
4970        assert_item_labels(&pane_a, [], cx);
4971        assert_item_labels(&pane_b, ["A*!", "B!"], cx);
4972    }
4973
4974    #[gpui::test]
4975    async fn test_drag_pinned_tab_into_existing_panes_unpinned_region(cx: &mut TestAppContext) {
4976        init_test(cx);
4977        let fs = FakeFs::new(cx.executor());
4978
4979        let project = Project::test(fs, None, cx).await;
4980        let (workspace, cx) =
4981            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
4982        let pane_a = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
4983
4984        // Add A to pane A and pin
4985        let item_a = add_labeled_item(&pane_a, "A", false, cx);
4986        pane_a.update_in(cx, |pane, window, cx| {
4987            let ix = pane.index_for_item_id(item_a.item_id()).unwrap();
4988            pane.pin_tab_at(ix, window, cx);
4989        });
4990        assert_item_labels(&pane_a, ["A*!"], cx);
4991
4992        // Create pane B with pinned item B
4993        let pane_b = workspace.update_in(cx, |workspace, window, cx| {
4994            workspace.split_pane(pane_a.clone(), SplitDirection::Right, window, cx)
4995        });
4996        let item_b = add_labeled_item(&pane_b, "B", false, cx);
4997        assert_item_labels(&pane_b, ["B*"], cx);
4998
4999        pane_b.update_in(cx, |pane, window, cx| {
5000            let ix = pane.index_for_item_id(item_b.item_id()).unwrap();
5001            pane.pin_tab_at(ix, window, cx);
5002        });
5003        assert_item_labels(&pane_b, ["B*!"], cx);
5004
5005        // Move A from pane A to pane B's unpinned region
5006        pane_b.update_in(cx, |pane, window, cx| {
5007            let dragged_tab = DraggedTab {
5008                pane: pane_a.clone(),
5009                item: item_a.boxed_clone(),
5010                ix: 0,
5011                detail: 0,
5012                is_active: true,
5013            };
5014            pane.handle_tab_drop(&dragged_tab, 1, window, cx);
5015        });
5016
5017        // A should become pinned
5018        assert_item_labels(&pane_a, [], cx);
5019        assert_item_labels(&pane_b, ["B!", "A*"], cx);
5020    }
5021
5022    #[gpui::test]
5023    async fn test_drag_pinned_tab_into_existing_panes_first_position_with_no_pinned_tabs(
5024        cx: &mut TestAppContext,
5025    ) {
5026        init_test(cx);
5027        let fs = FakeFs::new(cx.executor());
5028
5029        let project = Project::test(fs, None, cx).await;
5030        let (workspace, cx) =
5031            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
5032        let pane_a = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
5033
5034        // Add A to pane A and pin
5035        let item_a = add_labeled_item(&pane_a, "A", false, cx);
5036        pane_a.update_in(cx, |pane, window, cx| {
5037            let ix = pane.index_for_item_id(item_a.item_id()).unwrap();
5038            pane.pin_tab_at(ix, window, cx);
5039        });
5040        assert_item_labels(&pane_a, ["A*!"], cx);
5041
5042        // Add B to pane B
5043        let pane_b = workspace.update_in(cx, |workspace, window, cx| {
5044            workspace.split_pane(pane_a.clone(), SplitDirection::Right, window, cx)
5045        });
5046        add_labeled_item(&pane_b, "B", false, cx);
5047        assert_item_labels(&pane_b, ["B*"], cx);
5048
5049        // Move A from pane A to position 0 in pane B, indicating it should stay pinned
5050        pane_b.update_in(cx, |pane, window, cx| {
5051            let dragged_tab = DraggedTab {
5052                pane: pane_a.clone(),
5053                item: item_a.boxed_clone(),
5054                ix: 0,
5055                detail: 0,
5056                is_active: true,
5057            };
5058            pane.handle_tab_drop(&dragged_tab, 0, window, cx);
5059        });
5060
5061        // A should stay pinned
5062        assert_item_labels(&pane_a, [], cx);
5063        assert_item_labels(&pane_b, ["A*!", "B"], cx);
5064    }
5065
5066    #[gpui::test]
5067    async fn test_drag_pinned_tab_into_existing_pane_at_max_capacity_closes_unpinned_tabs(
5068        cx: &mut TestAppContext,
5069    ) {
5070        init_test(cx);
5071        let fs = FakeFs::new(cx.executor());
5072
5073        let project = Project::test(fs, None, cx).await;
5074        let (workspace, cx) =
5075            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
5076        let pane_a = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
5077        set_max_tabs(cx, Some(2));
5078
5079        // Add A, B to pane A. Pin both
5080        let item_a = add_labeled_item(&pane_a, "A", false, cx);
5081        let item_b = add_labeled_item(&pane_a, "B", false, cx);
5082        pane_a.update_in(cx, |pane, window, cx| {
5083            let ix = pane.index_for_item_id(item_a.item_id()).unwrap();
5084            pane.pin_tab_at(ix, window, cx);
5085
5086            let ix = pane.index_for_item_id(item_b.item_id()).unwrap();
5087            pane.pin_tab_at(ix, window, cx);
5088        });
5089        assert_item_labels(&pane_a, ["A!", "B*!"], cx);
5090
5091        // Add C, D to pane B. Pin both
5092        let pane_b = workspace.update_in(cx, |workspace, window, cx| {
5093            workspace.split_pane(pane_a.clone(), SplitDirection::Right, window, cx)
5094        });
5095        let item_c = add_labeled_item(&pane_b, "C", false, cx);
5096        let item_d = add_labeled_item(&pane_b, "D", false, cx);
5097        pane_b.update_in(cx, |pane, window, cx| {
5098            let ix = pane.index_for_item_id(item_c.item_id()).unwrap();
5099            pane.pin_tab_at(ix, window, cx);
5100
5101            let ix = pane.index_for_item_id(item_d.item_id()).unwrap();
5102            pane.pin_tab_at(ix, window, cx);
5103        });
5104        assert_item_labels(&pane_b, ["C!", "D*!"], cx);
5105
5106        // Add a third unpinned item to pane B (exceeds max tabs), but is allowed,
5107        // as we allow 1 tab over max if the others are pinned or dirty
5108        add_labeled_item(&pane_b, "E", false, cx);
5109        assert_item_labels(&pane_b, ["C!", "D!", "E*"], cx);
5110
5111        // Drag pinned A from pane A to position 0 in pane B
5112        pane_b.update_in(cx, |pane, window, cx| {
5113            let dragged_tab = DraggedTab {
5114                pane: pane_a.clone(),
5115                item: item_a.boxed_clone(),
5116                ix: 0,
5117                detail: 0,
5118                is_active: true,
5119            };
5120            pane.handle_tab_drop(&dragged_tab, 0, window, cx);
5121        });
5122
5123        // E (unpinned) should be closed, leaving 3 pinned items
5124        assert_item_labels(&pane_a, ["B*!"], cx);
5125        assert_item_labels(&pane_b, ["A*!", "C!", "D!"], cx);
5126    }
5127
5128    #[gpui::test]
5129    async fn test_drag_last_pinned_tab_to_same_position_stays_pinned(cx: &mut TestAppContext) {
5130        init_test(cx);
5131        let fs = FakeFs::new(cx.executor());
5132
5133        let project = Project::test(fs, None, cx).await;
5134        let (workspace, cx) =
5135            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
5136        let pane_a = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
5137
5138        // Add A to pane A and pin it
5139        let item_a = add_labeled_item(&pane_a, "A", false, cx);
5140        pane_a.update_in(cx, |pane, window, cx| {
5141            let ix = pane.index_for_item_id(item_a.item_id()).unwrap();
5142            pane.pin_tab_at(ix, window, cx);
5143        });
5144        assert_item_labels(&pane_a, ["A*!"], cx);
5145
5146        // Drag pinned A to position 1 (directly to the right) in the same pane
5147        pane_a.update_in(cx, |pane, window, cx| {
5148            let dragged_tab = DraggedTab {
5149                pane: pane_a.clone(),
5150                item: item_a.boxed_clone(),
5151                ix: 0,
5152                detail: 0,
5153                is_active: true,
5154            };
5155            pane.handle_tab_drop(&dragged_tab, 1, window, cx);
5156        });
5157
5158        // A should still be pinned and active
5159        assert_item_labels(&pane_a, ["A*!"], cx);
5160    }
5161
5162    #[gpui::test]
5163    async fn test_drag_pinned_tab_beyond_last_pinned_tab_in_same_pane_stays_pinned(
5164        cx: &mut TestAppContext,
5165    ) {
5166        init_test(cx);
5167        let fs = FakeFs::new(cx.executor());
5168
5169        let project = Project::test(fs, None, cx).await;
5170        let (workspace, cx) =
5171            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
5172        let pane_a = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
5173
5174        // Add A, B to pane A and pin both
5175        let item_a = add_labeled_item(&pane_a, "A", false, cx);
5176        let item_b = add_labeled_item(&pane_a, "B", false, cx);
5177        pane_a.update_in(cx, |pane, window, cx| {
5178            let ix = pane.index_for_item_id(item_a.item_id()).unwrap();
5179            pane.pin_tab_at(ix, window, cx);
5180
5181            let ix = pane.index_for_item_id(item_b.item_id()).unwrap();
5182            pane.pin_tab_at(ix, window, cx);
5183        });
5184        assert_item_labels(&pane_a, ["A!", "B*!"], cx);
5185
5186        // Drag pinned A right of B in the same pane
5187        pane_a.update_in(cx, |pane, window, cx| {
5188            let dragged_tab = DraggedTab {
5189                pane: pane_a.clone(),
5190                item: item_a.boxed_clone(),
5191                ix: 0,
5192                detail: 0,
5193                is_active: true,
5194            };
5195            pane.handle_tab_drop(&dragged_tab, 2, window, cx);
5196        });
5197
5198        // A stays pinned
5199        assert_item_labels(&pane_a, ["B!", "A*!"], cx);
5200    }
5201
5202    #[gpui::test]
5203    async fn test_dragging_pinned_tab_onto_unpinned_tab_reduces_unpinned_tab_count(
5204        cx: &mut TestAppContext,
5205    ) {
5206        init_test(cx);
5207        let fs = FakeFs::new(cx.executor());
5208
5209        let project = Project::test(fs, None, cx).await;
5210        let (workspace, cx) =
5211            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
5212        let pane_a = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
5213
5214        // Add A, B to pane A and pin A
5215        let item_a = add_labeled_item(&pane_a, "A", false, cx);
5216        add_labeled_item(&pane_a, "B", false, cx);
5217        pane_a.update_in(cx, |pane, window, cx| {
5218            let ix = pane.index_for_item_id(item_a.item_id()).unwrap();
5219            pane.pin_tab_at(ix, window, cx);
5220        });
5221        assert_item_labels(&pane_a, ["A!", "B*"], cx);
5222
5223        // Drag pinned A on top of B in the same pane, which changes tab order to B, A
5224        pane_a.update_in(cx, |pane, window, cx| {
5225            let dragged_tab = DraggedTab {
5226                pane: pane_a.clone(),
5227                item: item_a.boxed_clone(),
5228                ix: 0,
5229                detail: 0,
5230                is_active: true,
5231            };
5232            pane.handle_tab_drop(&dragged_tab, 1, window, cx);
5233        });
5234
5235        // Neither are pinned
5236        assert_item_labels(&pane_a, ["B", "A*"], cx);
5237    }
5238
5239    #[gpui::test]
5240    async fn test_drag_pinned_tab_beyond_unpinned_tab_in_same_pane_becomes_unpinned(
5241        cx: &mut TestAppContext,
5242    ) {
5243        init_test(cx);
5244        let fs = FakeFs::new(cx.executor());
5245
5246        let project = Project::test(fs, None, cx).await;
5247        let (workspace, cx) =
5248            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
5249        let pane_a = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
5250
5251        // Add A, B to pane A and pin A
5252        let item_a = add_labeled_item(&pane_a, "A", false, cx);
5253        add_labeled_item(&pane_a, "B", false, cx);
5254        pane_a.update_in(cx, |pane, window, cx| {
5255            let ix = pane.index_for_item_id(item_a.item_id()).unwrap();
5256            pane.pin_tab_at(ix, window, cx);
5257        });
5258        assert_item_labels(&pane_a, ["A!", "B*"], cx);
5259
5260        // Drag pinned A right of B in the same pane
5261        pane_a.update_in(cx, |pane, window, cx| {
5262            let dragged_tab = DraggedTab {
5263                pane: pane_a.clone(),
5264                item: item_a.boxed_clone(),
5265                ix: 0,
5266                detail: 0,
5267                is_active: true,
5268            };
5269            pane.handle_tab_drop(&dragged_tab, 2, window, cx);
5270        });
5271
5272        // A becomes unpinned
5273        assert_item_labels(&pane_a, ["B", "A*"], cx);
5274    }
5275
5276    #[gpui::test]
5277    async fn test_drag_unpinned_tab_in_front_of_pinned_tab_in_same_pane_becomes_pinned(
5278        cx: &mut TestAppContext,
5279    ) {
5280        init_test(cx);
5281        let fs = FakeFs::new(cx.executor());
5282
5283        let project = Project::test(fs, None, cx).await;
5284        let (workspace, cx) =
5285            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
5286        let pane_a = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
5287
5288        // Add A, B to pane A and pin A
5289        let item_a = add_labeled_item(&pane_a, "A", false, cx);
5290        let item_b = add_labeled_item(&pane_a, "B", false, cx);
5291        pane_a.update_in(cx, |pane, window, cx| {
5292            let ix = pane.index_for_item_id(item_a.item_id()).unwrap();
5293            pane.pin_tab_at(ix, window, cx);
5294        });
5295        assert_item_labels(&pane_a, ["A!", "B*"], cx);
5296
5297        // Drag pinned B left of A in the same pane
5298        pane_a.update_in(cx, |pane, window, cx| {
5299            let dragged_tab = DraggedTab {
5300                pane: pane_a.clone(),
5301                item: item_b.boxed_clone(),
5302                ix: 1,
5303                detail: 0,
5304                is_active: true,
5305            };
5306            pane.handle_tab_drop(&dragged_tab, 0, window, cx);
5307        });
5308
5309        // A becomes unpinned
5310        assert_item_labels(&pane_a, ["B*!", "A!"], cx);
5311    }
5312
5313    #[gpui::test]
5314    async fn test_drag_unpinned_tab_to_the_pinned_region_stays_pinned(cx: &mut TestAppContext) {
5315        init_test(cx);
5316        let fs = FakeFs::new(cx.executor());
5317
5318        let project = Project::test(fs, None, cx).await;
5319        let (workspace, cx) =
5320            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
5321        let pane_a = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
5322
5323        // Add A, B, C to pane A and pin A
5324        let item_a = add_labeled_item(&pane_a, "A", false, cx);
5325        add_labeled_item(&pane_a, "B", false, cx);
5326        let item_c = add_labeled_item(&pane_a, "C", false, cx);
5327        pane_a.update_in(cx, |pane, window, cx| {
5328            let ix = pane.index_for_item_id(item_a.item_id()).unwrap();
5329            pane.pin_tab_at(ix, window, cx);
5330        });
5331        assert_item_labels(&pane_a, ["A!", "B", "C*"], cx);
5332
5333        // Drag pinned C left of B in the same pane
5334        pane_a.update_in(cx, |pane, window, cx| {
5335            let dragged_tab = DraggedTab {
5336                pane: pane_a.clone(),
5337                item: item_c.boxed_clone(),
5338                ix: 2,
5339                detail: 0,
5340                is_active: true,
5341            };
5342            pane.handle_tab_drop(&dragged_tab, 1, window, cx);
5343        });
5344
5345        // A stays pinned, B and C remain unpinned
5346        assert_item_labels(&pane_a, ["A!", "C*", "B"], cx);
5347    }
5348
5349    #[gpui::test]
5350    async fn test_drag_unpinned_tab_into_existing_panes_pinned_region(cx: &mut TestAppContext) {
5351        init_test(cx);
5352        let fs = FakeFs::new(cx.executor());
5353
5354        let project = Project::test(fs, None, cx).await;
5355        let (workspace, cx) =
5356            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
5357        let pane_a = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
5358
5359        // Add unpinned item A to pane A
5360        let item_a = add_labeled_item(&pane_a, "A", false, cx);
5361        assert_item_labels(&pane_a, ["A*"], cx);
5362
5363        // Create pane B with pinned item B
5364        let pane_b = workspace.update_in(cx, |workspace, window, cx| {
5365            workspace.split_pane(pane_a.clone(), SplitDirection::Right, window, cx)
5366        });
5367        let item_b = add_labeled_item(&pane_b, "B", false, cx);
5368        pane_b.update_in(cx, |pane, window, cx| {
5369            let ix = pane.index_for_item_id(item_b.item_id()).unwrap();
5370            pane.pin_tab_at(ix, window, cx);
5371        });
5372        assert_item_labels(&pane_b, ["B*!"], cx);
5373
5374        // Move A from pane A to pane B's pinned region
5375        pane_b.update_in(cx, |pane, window, cx| {
5376            let dragged_tab = DraggedTab {
5377                pane: pane_a.clone(),
5378                item: item_a.boxed_clone(),
5379                ix: 0,
5380                detail: 0,
5381                is_active: true,
5382            };
5383            pane.handle_tab_drop(&dragged_tab, 0, window, cx);
5384        });
5385
5386        // A should become pinned since it was dropped in the pinned region
5387        assert_item_labels(&pane_a, [], cx);
5388        assert_item_labels(&pane_b, ["A*!", "B!"], cx);
5389    }
5390
5391    #[gpui::test]
5392    async fn test_drag_unpinned_tab_into_existing_panes_unpinned_region(cx: &mut TestAppContext) {
5393        init_test(cx);
5394        let fs = FakeFs::new(cx.executor());
5395
5396        let project = Project::test(fs, None, cx).await;
5397        let (workspace, cx) =
5398            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
5399        let pane_a = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
5400
5401        // Add unpinned item A to pane A
5402        let item_a = add_labeled_item(&pane_a, "A", false, cx);
5403        assert_item_labels(&pane_a, ["A*"], cx);
5404
5405        // Create pane B with one pinned item B
5406        let pane_b = workspace.update_in(cx, |workspace, window, cx| {
5407            workspace.split_pane(pane_a.clone(), SplitDirection::Right, window, cx)
5408        });
5409        let item_b = add_labeled_item(&pane_b, "B", false, cx);
5410        pane_b.update_in(cx, |pane, window, cx| {
5411            let ix = pane.index_for_item_id(item_b.item_id()).unwrap();
5412            pane.pin_tab_at(ix, window, cx);
5413        });
5414        assert_item_labels(&pane_b, ["B*!"], cx);
5415
5416        // Move A from pane A to pane B's unpinned region
5417        pane_b.update_in(cx, |pane, window, cx| {
5418            let dragged_tab = DraggedTab {
5419                pane: pane_a.clone(),
5420                item: item_a.boxed_clone(),
5421                ix: 0,
5422                detail: 0,
5423                is_active: true,
5424            };
5425            pane.handle_tab_drop(&dragged_tab, 1, window, cx);
5426        });
5427
5428        // A should remain unpinned since it was dropped outside the pinned region
5429        assert_item_labels(&pane_a, [], cx);
5430        assert_item_labels(&pane_b, ["B!", "A*"], cx);
5431    }
5432
5433    #[gpui::test]
5434    async fn test_drag_pinned_tab_throughout_entire_range_of_pinned_tabs_both_directions(
5435        cx: &mut TestAppContext,
5436    ) {
5437        init_test(cx);
5438        let fs = FakeFs::new(cx.executor());
5439
5440        let project = Project::test(fs, None, cx).await;
5441        let (workspace, cx) =
5442            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
5443        let pane_a = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
5444
5445        // Add A, B, C and pin all
5446        let item_a = add_labeled_item(&pane_a, "A", false, cx);
5447        let item_b = add_labeled_item(&pane_a, "B", false, cx);
5448        let item_c = add_labeled_item(&pane_a, "C", false, cx);
5449        assert_item_labels(&pane_a, ["A", "B", "C*"], cx);
5450
5451        pane_a.update_in(cx, |pane, window, cx| {
5452            let ix = pane.index_for_item_id(item_a.item_id()).unwrap();
5453            pane.pin_tab_at(ix, window, cx);
5454
5455            let ix = pane.index_for_item_id(item_b.item_id()).unwrap();
5456            pane.pin_tab_at(ix, window, cx);
5457
5458            let ix = pane.index_for_item_id(item_c.item_id()).unwrap();
5459            pane.pin_tab_at(ix, window, cx);
5460        });
5461        assert_item_labels(&pane_a, ["A!", "B!", "C*!"], cx);
5462
5463        // Move A to right of B
5464        pane_a.update_in(cx, |pane, window, cx| {
5465            let dragged_tab = DraggedTab {
5466                pane: pane_a.clone(),
5467                item: item_a.boxed_clone(),
5468                ix: 0,
5469                detail: 0,
5470                is_active: true,
5471            };
5472            pane.handle_tab_drop(&dragged_tab, 1, window, cx);
5473        });
5474
5475        // A should be after B and all are pinned
5476        assert_item_labels(&pane_a, ["B!", "A*!", "C!"], cx);
5477
5478        // Move A to right of C
5479        pane_a.update_in(cx, |pane, window, cx| {
5480            let dragged_tab = DraggedTab {
5481                pane: pane_a.clone(),
5482                item: item_a.boxed_clone(),
5483                ix: 1,
5484                detail: 0,
5485                is_active: true,
5486            };
5487            pane.handle_tab_drop(&dragged_tab, 2, window, cx);
5488        });
5489
5490        // A should be after C and all are pinned
5491        assert_item_labels(&pane_a, ["B!", "C!", "A*!"], cx);
5492
5493        // Move A to left of C
5494        pane_a.update_in(cx, |pane, window, cx| {
5495            let dragged_tab = DraggedTab {
5496                pane: pane_a.clone(),
5497                item: item_a.boxed_clone(),
5498                ix: 2,
5499                detail: 0,
5500                is_active: true,
5501            };
5502            pane.handle_tab_drop(&dragged_tab, 1, window, cx);
5503        });
5504
5505        // A should be before C and all are pinned
5506        assert_item_labels(&pane_a, ["B!", "A*!", "C!"], cx);
5507
5508        // Move A to left of B
5509        pane_a.update_in(cx, |pane, window, cx| {
5510            let dragged_tab = DraggedTab {
5511                pane: pane_a.clone(),
5512                item: item_a.boxed_clone(),
5513                ix: 1,
5514                detail: 0,
5515                is_active: true,
5516            };
5517            pane.handle_tab_drop(&dragged_tab, 0, window, cx);
5518        });
5519
5520        // A should be before B and all are pinned
5521        assert_item_labels(&pane_a, ["A*!", "B!", "C!"], cx);
5522    }
5523
5524    #[gpui::test]
5525    async fn test_drag_first_tab_to_last_position(cx: &mut TestAppContext) {
5526        init_test(cx);
5527        let fs = FakeFs::new(cx.executor());
5528
5529        let project = Project::test(fs, None, cx).await;
5530        let (workspace, cx) =
5531            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
5532        let pane_a = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
5533
5534        // Add A, B, C
5535        let item_a = add_labeled_item(&pane_a, "A", false, cx);
5536        add_labeled_item(&pane_a, "B", false, cx);
5537        add_labeled_item(&pane_a, "C", false, cx);
5538        assert_item_labels(&pane_a, ["A", "B", "C*"], cx);
5539
5540        // Move A to the end
5541        pane_a.update_in(cx, |pane, window, cx| {
5542            let dragged_tab = DraggedTab {
5543                pane: pane_a.clone(),
5544                item: item_a.boxed_clone(),
5545                ix: 0,
5546                detail: 0,
5547                is_active: true,
5548            };
5549            pane.handle_tab_drop(&dragged_tab, 2, window, cx);
5550        });
5551
5552        // A should be at the end
5553        assert_item_labels(&pane_a, ["B", "C", "A*"], cx);
5554    }
5555
5556    #[gpui::test]
5557    async fn test_drag_last_tab_to_first_position(cx: &mut TestAppContext) {
5558        init_test(cx);
5559        let fs = FakeFs::new(cx.executor());
5560
5561        let project = Project::test(fs, None, cx).await;
5562        let (workspace, cx) =
5563            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
5564        let pane_a = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
5565
5566        // Add A, B, C
5567        add_labeled_item(&pane_a, "A", false, cx);
5568        add_labeled_item(&pane_a, "B", false, cx);
5569        let item_c = add_labeled_item(&pane_a, "C", false, cx);
5570        assert_item_labels(&pane_a, ["A", "B", "C*"], cx);
5571
5572        // Move C to the beginning
5573        pane_a.update_in(cx, |pane, window, cx| {
5574            let dragged_tab = DraggedTab {
5575                pane: pane_a.clone(),
5576                item: item_c.boxed_clone(),
5577                ix: 2,
5578                detail: 0,
5579                is_active: true,
5580            };
5581            pane.handle_tab_drop(&dragged_tab, 0, window, cx);
5582        });
5583
5584        // C should be at the beginning
5585        assert_item_labels(&pane_a, ["C*", "A", "B"], cx);
5586    }
5587
5588    #[gpui::test]
5589    async fn test_add_item_with_new_item(cx: &mut TestAppContext) {
5590        init_test(cx);
5591        let fs = FakeFs::new(cx.executor());
5592
5593        let project = Project::test(fs, None, cx).await;
5594        let (workspace, cx) =
5595            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
5596        let pane = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
5597
5598        // 1. Add with a destination index
5599        //   a. Add before the active item
5600        set_labeled_items(&pane, ["A", "B*", "C"], cx);
5601        pane.update_in(cx, |pane, window, cx| {
5602            pane.add_item(
5603                Box::new(cx.new(|cx| TestItem::new(cx).with_label("D"))),
5604                false,
5605                false,
5606                Some(0),
5607                window,
5608                cx,
5609            );
5610        });
5611        assert_item_labels(&pane, ["D*", "A", "B", "C"], cx);
5612
5613        //   b. Add after the active item
5614        set_labeled_items(&pane, ["A", "B*", "C"], cx);
5615        pane.update_in(cx, |pane, window, cx| {
5616            pane.add_item(
5617                Box::new(cx.new(|cx| TestItem::new(cx).with_label("D"))),
5618                false,
5619                false,
5620                Some(2),
5621                window,
5622                cx,
5623            );
5624        });
5625        assert_item_labels(&pane, ["A", "B", "D*", "C"], cx);
5626
5627        //   c. Add at the end of the item list (including off the length)
5628        set_labeled_items(&pane, ["A", "B*", "C"], cx);
5629        pane.update_in(cx, |pane, window, cx| {
5630            pane.add_item(
5631                Box::new(cx.new(|cx| TestItem::new(cx).with_label("D"))),
5632                false,
5633                false,
5634                Some(5),
5635                window,
5636                cx,
5637            );
5638        });
5639        assert_item_labels(&pane, ["A", "B", "C", "D*"], cx);
5640
5641        // 2. Add without a destination index
5642        //   a. Add with active item at the start of the item list
5643        set_labeled_items(&pane, ["A*", "B", "C"], cx);
5644        pane.update_in(cx, |pane, window, cx| {
5645            pane.add_item(
5646                Box::new(cx.new(|cx| TestItem::new(cx).with_label("D"))),
5647                false,
5648                false,
5649                None,
5650                window,
5651                cx,
5652            );
5653        });
5654        set_labeled_items(&pane, ["A", "D*", "B", "C"], cx);
5655
5656        //   b. Add with active item at the end of the item list
5657        set_labeled_items(&pane, ["A", "B", "C*"], cx);
5658        pane.update_in(cx, |pane, window, cx| {
5659            pane.add_item(
5660                Box::new(cx.new(|cx| TestItem::new(cx).with_label("D"))),
5661                false,
5662                false,
5663                None,
5664                window,
5665                cx,
5666            );
5667        });
5668        assert_item_labels(&pane, ["A", "B", "C", "D*"], cx);
5669    }
5670
5671    #[gpui::test]
5672    async fn test_add_item_with_existing_item(cx: &mut TestAppContext) {
5673        init_test(cx);
5674        let fs = FakeFs::new(cx.executor());
5675
5676        let project = Project::test(fs, None, cx).await;
5677        let (workspace, cx) =
5678            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
5679        let pane = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
5680
5681        // 1. Add with a destination index
5682        //   1a. Add before the active item
5683        let [_, _, _, d] = set_labeled_items(&pane, ["A", "B*", "C", "D"], cx);
5684        pane.update_in(cx, |pane, window, cx| {
5685            pane.add_item(d, false, false, Some(0), window, cx);
5686        });
5687        assert_item_labels(&pane, ["D*", "A", "B", "C"], cx);
5688
5689        //   1b. Add after the active item
5690        let [_, _, _, d] = set_labeled_items(&pane, ["A", "B*", "C", "D"], cx);
5691        pane.update_in(cx, |pane, window, cx| {
5692            pane.add_item(d, false, false, Some(2), window, cx);
5693        });
5694        assert_item_labels(&pane, ["A", "B", "D*", "C"], cx);
5695
5696        //   1c. Add at the end of the item list (including off the length)
5697        let [a, _, _, _] = set_labeled_items(&pane, ["A", "B*", "C", "D"], cx);
5698        pane.update_in(cx, |pane, window, cx| {
5699            pane.add_item(a, false, false, Some(5), window, cx);
5700        });
5701        assert_item_labels(&pane, ["B", "C", "D", "A*"], cx);
5702
5703        //   1d. Add same item to active index
5704        let [_, b, _] = set_labeled_items(&pane, ["A", "B*", "C"], cx);
5705        pane.update_in(cx, |pane, window, cx| {
5706            pane.add_item(b, false, false, Some(1), window, cx);
5707        });
5708        assert_item_labels(&pane, ["A", "B*", "C"], cx);
5709
5710        //   1e. Add item to index after same item in last position
5711        let [_, _, c] = set_labeled_items(&pane, ["A", "B*", "C"], cx);
5712        pane.update_in(cx, |pane, window, cx| {
5713            pane.add_item(c, false, false, Some(2), window, cx);
5714        });
5715        assert_item_labels(&pane, ["A", "B", "C*"], cx);
5716
5717        // 2. Add without a destination index
5718        //   2a. Add with active item at the start of the item list
5719        let [_, _, _, d] = set_labeled_items(&pane, ["A*", "B", "C", "D"], cx);
5720        pane.update_in(cx, |pane, window, cx| {
5721            pane.add_item(d, false, false, None, window, cx);
5722        });
5723        assert_item_labels(&pane, ["A", "D*", "B", "C"], cx);
5724
5725        //   2b. Add with active item at the end of the item list
5726        let [a, _, _, _] = set_labeled_items(&pane, ["A", "B", "C", "D*"], cx);
5727        pane.update_in(cx, |pane, window, cx| {
5728            pane.add_item(a, false, false, None, window, cx);
5729        });
5730        assert_item_labels(&pane, ["B", "C", "D", "A*"], cx);
5731
5732        //   2c. Add active item to active item at end of list
5733        let [_, _, c] = set_labeled_items(&pane, ["A", "B", "C*"], cx);
5734        pane.update_in(cx, |pane, window, cx| {
5735            pane.add_item(c, false, false, None, window, cx);
5736        });
5737        assert_item_labels(&pane, ["A", "B", "C*"], cx);
5738
5739        //   2d. Add active item to active item at start of list
5740        let [a, _, _] = set_labeled_items(&pane, ["A*", "B", "C"], cx);
5741        pane.update_in(cx, |pane, window, cx| {
5742            pane.add_item(a, false, false, None, window, cx);
5743        });
5744        assert_item_labels(&pane, ["A*", "B", "C"], cx);
5745    }
5746
5747    #[gpui::test]
5748    async fn test_add_item_with_same_project_entries(cx: &mut TestAppContext) {
5749        init_test(cx);
5750        let fs = FakeFs::new(cx.executor());
5751
5752        let project = Project::test(fs, None, cx).await;
5753        let (workspace, cx) =
5754            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
5755        let pane = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
5756
5757        // singleton view
5758        pane.update_in(cx, |pane, window, cx| {
5759            pane.add_item(
5760                Box::new(cx.new(|cx| {
5761                    TestItem::new(cx)
5762                        .with_buffer_kind(ItemBufferKind::Singleton)
5763                        .with_label("buffer 1")
5764                        .with_project_items(&[TestProjectItem::new(1, "one.txt", cx)])
5765                })),
5766                false,
5767                false,
5768                None,
5769                window,
5770                cx,
5771            );
5772        });
5773        assert_item_labels(&pane, ["buffer 1*"], cx);
5774
5775        // new singleton view with the same project entry
5776        pane.update_in(cx, |pane, window, cx| {
5777            pane.add_item(
5778                Box::new(cx.new(|cx| {
5779                    TestItem::new(cx)
5780                        .with_buffer_kind(ItemBufferKind::Singleton)
5781                        .with_label("buffer 1")
5782                        .with_project_items(&[TestProjectItem::new(1, "1.txt", cx)])
5783                })),
5784                false,
5785                false,
5786                None,
5787                window,
5788                cx,
5789            );
5790        });
5791        assert_item_labels(&pane, ["buffer 1*"], cx);
5792
5793        // new singleton view with different project entry
5794        pane.update_in(cx, |pane, window, cx| {
5795            pane.add_item(
5796                Box::new(cx.new(|cx| {
5797                    TestItem::new(cx)
5798                        .with_buffer_kind(ItemBufferKind::Singleton)
5799                        .with_label("buffer 2")
5800                        .with_project_items(&[TestProjectItem::new(2, "2.txt", cx)])
5801                })),
5802                false,
5803                false,
5804                None,
5805                window,
5806                cx,
5807            );
5808        });
5809        assert_item_labels(&pane, ["buffer 1", "buffer 2*"], cx);
5810
5811        // new multibuffer view with the same project entry
5812        pane.update_in(cx, |pane, window, cx| {
5813            pane.add_item(
5814                Box::new(cx.new(|cx| {
5815                    TestItem::new(cx)
5816                        .with_buffer_kind(ItemBufferKind::Multibuffer)
5817                        .with_label("multibuffer 1")
5818                        .with_project_items(&[TestProjectItem::new(1, "1.txt", cx)])
5819                })),
5820                false,
5821                false,
5822                None,
5823                window,
5824                cx,
5825            );
5826        });
5827        assert_item_labels(&pane, ["buffer 1", "buffer 2", "multibuffer 1*"], cx);
5828
5829        // another multibuffer view with the same project entry
5830        pane.update_in(cx, |pane, window, cx| {
5831            pane.add_item(
5832                Box::new(cx.new(|cx| {
5833                    TestItem::new(cx)
5834                        .with_buffer_kind(ItemBufferKind::Multibuffer)
5835                        .with_label("multibuffer 1b")
5836                        .with_project_items(&[TestProjectItem::new(1, "1.txt", cx)])
5837                })),
5838                false,
5839                false,
5840                None,
5841                window,
5842                cx,
5843            );
5844        });
5845        assert_item_labels(
5846            &pane,
5847            ["buffer 1", "buffer 2", "multibuffer 1", "multibuffer 1b*"],
5848            cx,
5849        );
5850    }
5851
5852    #[gpui::test]
5853    async fn test_remove_item_ordering_history(cx: &mut TestAppContext) {
5854        init_test(cx);
5855        let fs = FakeFs::new(cx.executor());
5856
5857        let project = Project::test(fs, None, cx).await;
5858        let (workspace, cx) =
5859            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
5860        let pane = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
5861
5862        add_labeled_item(&pane, "A", false, cx);
5863        add_labeled_item(&pane, "B", false, cx);
5864        add_labeled_item(&pane, "C", false, cx);
5865        add_labeled_item(&pane, "D", false, cx);
5866        assert_item_labels(&pane, ["A", "B", "C", "D*"], cx);
5867
5868        pane.update_in(cx, |pane, window, cx| {
5869            pane.activate_item(1, false, false, window, cx)
5870        });
5871        add_labeled_item(&pane, "1", false, cx);
5872        assert_item_labels(&pane, ["A", "B", "1*", "C", "D"], cx);
5873
5874        pane.update_in(cx, |pane, window, cx| {
5875            pane.close_active_item(
5876                &CloseActiveItem {
5877                    save_intent: None,
5878                    close_pinned: false,
5879                },
5880                window,
5881                cx,
5882            )
5883        })
5884        .await
5885        .unwrap();
5886        assert_item_labels(&pane, ["A", "B*", "C", "D"], cx);
5887
5888        pane.update_in(cx, |pane, window, cx| {
5889            pane.activate_item(3, false, false, window, cx)
5890        });
5891        assert_item_labels(&pane, ["A", "B", "C", "D*"], cx);
5892
5893        pane.update_in(cx, |pane, window, cx| {
5894            pane.close_active_item(
5895                &CloseActiveItem {
5896                    save_intent: None,
5897                    close_pinned: false,
5898                },
5899                window,
5900                cx,
5901            )
5902        })
5903        .await
5904        .unwrap();
5905        assert_item_labels(&pane, ["A", "B*", "C"], cx);
5906
5907        pane.update_in(cx, |pane, window, cx| {
5908            pane.close_active_item(
5909                &CloseActiveItem {
5910                    save_intent: None,
5911                    close_pinned: false,
5912                },
5913                window,
5914                cx,
5915            )
5916        })
5917        .await
5918        .unwrap();
5919        assert_item_labels(&pane, ["A", "C*"], cx);
5920
5921        pane.update_in(cx, |pane, window, cx| {
5922            pane.close_active_item(
5923                &CloseActiveItem {
5924                    save_intent: None,
5925                    close_pinned: false,
5926                },
5927                window,
5928                cx,
5929            )
5930        })
5931        .await
5932        .unwrap();
5933        assert_item_labels(&pane, ["A*"], cx);
5934    }
5935
5936    #[gpui::test]
5937    async fn test_remove_item_ordering_neighbour(cx: &mut TestAppContext) {
5938        init_test(cx);
5939        cx.update_global::<SettingsStore, ()>(|s, cx| {
5940            s.update_user_settings(cx, |s| {
5941                s.tabs.get_or_insert_default().activate_on_close = Some(ActivateOnClose::Neighbour);
5942            });
5943        });
5944        let fs = FakeFs::new(cx.executor());
5945
5946        let project = Project::test(fs, None, cx).await;
5947        let (workspace, cx) =
5948            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
5949        let pane = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
5950
5951        add_labeled_item(&pane, "A", false, cx);
5952        add_labeled_item(&pane, "B", false, cx);
5953        add_labeled_item(&pane, "C", false, cx);
5954        add_labeled_item(&pane, "D", false, cx);
5955        assert_item_labels(&pane, ["A", "B", "C", "D*"], cx);
5956
5957        pane.update_in(cx, |pane, window, cx| {
5958            pane.activate_item(1, false, false, window, cx)
5959        });
5960        add_labeled_item(&pane, "1", false, cx);
5961        assert_item_labels(&pane, ["A", "B", "1*", "C", "D"], cx);
5962
5963        pane.update_in(cx, |pane, window, cx| {
5964            pane.close_active_item(
5965                &CloseActiveItem {
5966                    save_intent: None,
5967                    close_pinned: false,
5968                },
5969                window,
5970                cx,
5971            )
5972        })
5973        .await
5974        .unwrap();
5975        assert_item_labels(&pane, ["A", "B", "C*", "D"], cx);
5976
5977        pane.update_in(cx, |pane, window, cx| {
5978            pane.activate_item(3, false, false, window, cx)
5979        });
5980        assert_item_labels(&pane, ["A", "B", "C", "D*"], cx);
5981
5982        pane.update_in(cx, |pane, window, cx| {
5983            pane.close_active_item(
5984                &CloseActiveItem {
5985                    save_intent: None,
5986                    close_pinned: false,
5987                },
5988                window,
5989                cx,
5990            )
5991        })
5992        .await
5993        .unwrap();
5994        assert_item_labels(&pane, ["A", "B", "C*"], cx);
5995
5996        pane.update_in(cx, |pane, window, cx| {
5997            pane.close_active_item(
5998                &CloseActiveItem {
5999                    save_intent: None,
6000                    close_pinned: false,
6001                },
6002                window,
6003                cx,
6004            )
6005        })
6006        .await
6007        .unwrap();
6008        assert_item_labels(&pane, ["A", "B*"], cx);
6009
6010        pane.update_in(cx, |pane, window, cx| {
6011            pane.close_active_item(
6012                &CloseActiveItem {
6013                    save_intent: None,
6014                    close_pinned: false,
6015                },
6016                window,
6017                cx,
6018            )
6019        })
6020        .await
6021        .unwrap();
6022        assert_item_labels(&pane, ["A*"], cx);
6023    }
6024
6025    #[gpui::test]
6026    async fn test_remove_item_ordering_left_neighbour(cx: &mut TestAppContext) {
6027        init_test(cx);
6028        cx.update_global::<SettingsStore, ()>(|s, cx| {
6029            s.update_user_settings(cx, |s| {
6030                s.tabs.get_or_insert_default().activate_on_close =
6031                    Some(ActivateOnClose::LeftNeighbour);
6032            });
6033        });
6034        let fs = FakeFs::new(cx.executor());
6035
6036        let project = Project::test(fs, None, cx).await;
6037        let (workspace, cx) =
6038            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
6039        let pane = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
6040
6041        add_labeled_item(&pane, "A", false, cx);
6042        add_labeled_item(&pane, "B", false, cx);
6043        add_labeled_item(&pane, "C", false, cx);
6044        add_labeled_item(&pane, "D", false, cx);
6045        assert_item_labels(&pane, ["A", "B", "C", "D*"], cx);
6046
6047        pane.update_in(cx, |pane, window, cx| {
6048            pane.activate_item(1, false, false, window, cx)
6049        });
6050        add_labeled_item(&pane, "1", false, cx);
6051        assert_item_labels(&pane, ["A", "B", "1*", "C", "D"], cx);
6052
6053        pane.update_in(cx, |pane, window, cx| {
6054            pane.close_active_item(
6055                &CloseActiveItem {
6056                    save_intent: None,
6057                    close_pinned: false,
6058                },
6059                window,
6060                cx,
6061            )
6062        })
6063        .await
6064        .unwrap();
6065        assert_item_labels(&pane, ["A", "B*", "C", "D"], cx);
6066
6067        pane.update_in(cx, |pane, window, cx| {
6068            pane.activate_item(3, false, false, window, cx)
6069        });
6070        assert_item_labels(&pane, ["A", "B", "C", "D*"], cx);
6071
6072        pane.update_in(cx, |pane, window, cx| {
6073            pane.close_active_item(
6074                &CloseActiveItem {
6075                    save_intent: None,
6076                    close_pinned: false,
6077                },
6078                window,
6079                cx,
6080            )
6081        })
6082        .await
6083        .unwrap();
6084        assert_item_labels(&pane, ["A", "B", "C*"], cx);
6085
6086        pane.update_in(cx, |pane, window, cx| {
6087            pane.activate_item(0, false, false, window, cx)
6088        });
6089        assert_item_labels(&pane, ["A*", "B", "C"], cx);
6090
6091        pane.update_in(cx, |pane, window, cx| {
6092            pane.close_active_item(
6093                &CloseActiveItem {
6094                    save_intent: None,
6095                    close_pinned: false,
6096                },
6097                window,
6098                cx,
6099            )
6100        })
6101        .await
6102        .unwrap();
6103        assert_item_labels(&pane, ["B*", "C"], cx);
6104
6105        pane.update_in(cx, |pane, window, cx| {
6106            pane.close_active_item(
6107                &CloseActiveItem {
6108                    save_intent: None,
6109                    close_pinned: false,
6110                },
6111                window,
6112                cx,
6113            )
6114        })
6115        .await
6116        .unwrap();
6117        assert_item_labels(&pane, ["C*"], cx);
6118    }
6119
6120    #[gpui::test]
6121    async fn test_close_inactive_items(cx: &mut TestAppContext) {
6122        init_test(cx);
6123        let fs = FakeFs::new(cx.executor());
6124
6125        let project = Project::test(fs, None, cx).await;
6126        let (workspace, cx) =
6127            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
6128        let pane = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
6129
6130        let item_a = add_labeled_item(&pane, "A", false, cx);
6131        pane.update_in(cx, |pane, window, cx| {
6132            let ix = pane.index_for_item_id(item_a.item_id()).unwrap();
6133            pane.pin_tab_at(ix, window, cx);
6134        });
6135        assert_item_labels(&pane, ["A*!"], cx);
6136
6137        let item_b = add_labeled_item(&pane, "B", false, cx);
6138        pane.update_in(cx, |pane, window, cx| {
6139            let ix = pane.index_for_item_id(item_b.item_id()).unwrap();
6140            pane.pin_tab_at(ix, window, cx);
6141        });
6142        assert_item_labels(&pane, ["A!", "B*!"], cx);
6143
6144        add_labeled_item(&pane, "C", false, cx);
6145        assert_item_labels(&pane, ["A!", "B!", "C*"], cx);
6146
6147        add_labeled_item(&pane, "D", false, cx);
6148        add_labeled_item(&pane, "E", false, cx);
6149        assert_item_labels(&pane, ["A!", "B!", "C", "D", "E*"], cx);
6150
6151        pane.update_in(cx, |pane, window, cx| {
6152            pane.close_other_items(
6153                &CloseOtherItems {
6154                    save_intent: None,
6155                    close_pinned: false,
6156                },
6157                None,
6158                window,
6159                cx,
6160            )
6161        })
6162        .await
6163        .unwrap();
6164        assert_item_labels(&pane, ["A!", "B!", "E*"], cx);
6165    }
6166
6167    #[gpui::test]
6168    async fn test_running_close_inactive_items_via_an_inactive_item(cx: &mut TestAppContext) {
6169        init_test(cx);
6170        let fs = FakeFs::new(cx.executor());
6171
6172        let project = Project::test(fs, None, cx).await;
6173        let (workspace, cx) =
6174            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
6175        let pane = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
6176
6177        add_labeled_item(&pane, "A", false, cx);
6178        assert_item_labels(&pane, ["A*"], cx);
6179
6180        let item_b = add_labeled_item(&pane, "B", false, cx);
6181        assert_item_labels(&pane, ["A", "B*"], cx);
6182
6183        add_labeled_item(&pane, "C", false, cx);
6184        add_labeled_item(&pane, "D", false, cx);
6185        add_labeled_item(&pane, "E", false, cx);
6186        assert_item_labels(&pane, ["A", "B", "C", "D", "E*"], cx);
6187
6188        pane.update_in(cx, |pane, window, cx| {
6189            pane.close_other_items(
6190                &CloseOtherItems {
6191                    save_intent: None,
6192                    close_pinned: false,
6193                },
6194                Some(item_b.item_id()),
6195                window,
6196                cx,
6197            )
6198        })
6199        .await
6200        .unwrap();
6201        assert_item_labels(&pane, ["B*"], cx);
6202    }
6203
6204    #[gpui::test]
6205    async fn test_close_clean_items(cx: &mut TestAppContext) {
6206        init_test(cx);
6207        let fs = FakeFs::new(cx.executor());
6208
6209        let project = Project::test(fs, None, cx).await;
6210        let (workspace, cx) =
6211            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
6212        let pane = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
6213
6214        add_labeled_item(&pane, "A", true, cx);
6215        add_labeled_item(&pane, "B", false, cx);
6216        add_labeled_item(&pane, "C", true, cx);
6217        add_labeled_item(&pane, "D", false, cx);
6218        add_labeled_item(&pane, "E", false, cx);
6219        assert_item_labels(&pane, ["A^", "B", "C^", "D", "E*"], cx);
6220
6221        pane.update_in(cx, |pane, window, cx| {
6222            pane.close_clean_items(
6223                &CloseCleanItems {
6224                    close_pinned: false,
6225                },
6226                window,
6227                cx,
6228            )
6229        })
6230        .await
6231        .unwrap();
6232        assert_item_labels(&pane, ["A^", "C*^"], cx);
6233    }
6234
6235    #[gpui::test]
6236    async fn test_close_items_to_the_left(cx: &mut TestAppContext) {
6237        init_test(cx);
6238        let fs = FakeFs::new(cx.executor());
6239
6240        let project = Project::test(fs, None, cx).await;
6241        let (workspace, cx) =
6242            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
6243        let pane = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
6244
6245        set_labeled_items(&pane, ["A", "B", "C*", "D", "E"], cx);
6246
6247        pane.update_in(cx, |pane, window, cx| {
6248            pane.close_items_to_the_left_by_id(
6249                None,
6250                &CloseItemsToTheLeft {
6251                    close_pinned: false,
6252                },
6253                window,
6254                cx,
6255            )
6256        })
6257        .await
6258        .unwrap();
6259        assert_item_labels(&pane, ["C*", "D", "E"], cx);
6260    }
6261
6262    #[gpui::test]
6263    async fn test_close_items_to_the_right(cx: &mut TestAppContext) {
6264        init_test(cx);
6265        let fs = FakeFs::new(cx.executor());
6266
6267        let project = Project::test(fs, None, cx).await;
6268        let (workspace, cx) =
6269            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
6270        let pane = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
6271
6272        set_labeled_items(&pane, ["A", "B", "C*", "D", "E"], cx);
6273
6274        pane.update_in(cx, |pane, window, cx| {
6275            pane.close_items_to_the_right_by_id(
6276                None,
6277                &CloseItemsToTheRight {
6278                    close_pinned: false,
6279                },
6280                window,
6281                cx,
6282            )
6283        })
6284        .await
6285        .unwrap();
6286        assert_item_labels(&pane, ["A", "B", "C*"], cx);
6287    }
6288
6289    #[gpui::test]
6290    async fn test_close_all_items(cx: &mut TestAppContext) {
6291        init_test(cx);
6292        let fs = FakeFs::new(cx.executor());
6293
6294        let project = Project::test(fs, None, cx).await;
6295        let (workspace, cx) =
6296            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
6297        let pane = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
6298
6299        let item_a = add_labeled_item(&pane, "A", false, cx);
6300        add_labeled_item(&pane, "B", false, cx);
6301        add_labeled_item(&pane, "C", false, cx);
6302        assert_item_labels(&pane, ["A", "B", "C*"], cx);
6303
6304        pane.update_in(cx, |pane, window, cx| {
6305            let ix = pane.index_for_item_id(item_a.item_id()).unwrap();
6306            pane.pin_tab_at(ix, window, cx);
6307            pane.close_all_items(
6308                &CloseAllItems {
6309                    save_intent: None,
6310                    close_pinned: false,
6311                },
6312                window,
6313                cx,
6314            )
6315        })
6316        .await
6317        .unwrap();
6318        assert_item_labels(&pane, ["A*!"], cx);
6319
6320        pane.update_in(cx, |pane, window, cx| {
6321            let ix = pane.index_for_item_id(item_a.item_id()).unwrap();
6322            pane.unpin_tab_at(ix, window, cx);
6323            pane.close_all_items(
6324                &CloseAllItems {
6325                    save_intent: None,
6326                    close_pinned: false,
6327                },
6328                window,
6329                cx,
6330            )
6331        })
6332        .await
6333        .unwrap();
6334
6335        assert_item_labels(&pane, [], cx);
6336
6337        add_labeled_item(&pane, "A", true, cx).update(cx, |item, cx| {
6338            item.project_items
6339                .push(TestProjectItem::new_dirty(1, "A.txt", cx))
6340        });
6341        add_labeled_item(&pane, "B", true, cx).update(cx, |item, cx| {
6342            item.project_items
6343                .push(TestProjectItem::new_dirty(2, "B.txt", cx))
6344        });
6345        add_labeled_item(&pane, "C", true, cx).update(cx, |item, cx| {
6346            item.project_items
6347                .push(TestProjectItem::new_dirty(3, "C.txt", cx))
6348        });
6349        assert_item_labels(&pane, ["A^", "B^", "C*^"], cx);
6350
6351        let save = pane.update_in(cx, |pane, window, cx| {
6352            pane.close_all_items(
6353                &CloseAllItems {
6354                    save_intent: None,
6355                    close_pinned: false,
6356                },
6357                window,
6358                cx,
6359            )
6360        });
6361
6362        cx.executor().run_until_parked();
6363        cx.simulate_prompt_answer("Save all");
6364        save.await.unwrap();
6365        assert_item_labels(&pane, [], cx);
6366
6367        add_labeled_item(&pane, "A", true, cx);
6368        add_labeled_item(&pane, "B", true, cx);
6369        add_labeled_item(&pane, "C", true, cx);
6370        assert_item_labels(&pane, ["A^", "B^", "C*^"], cx);
6371        let save = pane.update_in(cx, |pane, window, cx| {
6372            pane.close_all_items(
6373                &CloseAllItems {
6374                    save_intent: None,
6375                    close_pinned: false,
6376                },
6377                window,
6378                cx,
6379            )
6380        });
6381
6382        cx.executor().run_until_parked();
6383        cx.simulate_prompt_answer("Discard all");
6384        save.await.unwrap();
6385        assert_item_labels(&pane, [], cx);
6386    }
6387
6388    #[gpui::test]
6389    async fn test_close_multibuffer_items(cx: &mut TestAppContext) {
6390        init_test(cx);
6391        let fs = FakeFs::new(cx.executor());
6392
6393        let project = Project::test(fs, None, cx).await;
6394        let (workspace, cx) =
6395            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
6396        let pane = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
6397
6398        let add_labeled_item = |pane: &Entity<Pane>,
6399                                label,
6400                                is_dirty,
6401                                kind: ItemBufferKind,
6402                                cx: &mut VisualTestContext| {
6403            pane.update_in(cx, |pane, window, cx| {
6404                let labeled_item = Box::new(cx.new(|cx| {
6405                    TestItem::new(cx)
6406                        .with_label(label)
6407                        .with_dirty(is_dirty)
6408                        .with_buffer_kind(kind)
6409                }));
6410                pane.add_item(labeled_item.clone(), false, false, None, window, cx);
6411                labeled_item
6412            })
6413        };
6414
6415        let item_a = add_labeled_item(&pane, "A", false, ItemBufferKind::Multibuffer, cx);
6416        add_labeled_item(&pane, "B", false, ItemBufferKind::Multibuffer, cx);
6417        add_labeled_item(&pane, "C", false, ItemBufferKind::Singleton, cx);
6418        assert_item_labels(&pane, ["A", "B", "C*"], cx);
6419
6420        pane.update_in(cx, |pane, window, cx| {
6421            let ix = pane.index_for_item_id(item_a.item_id()).unwrap();
6422            pane.pin_tab_at(ix, window, cx);
6423            pane.close_multibuffer_items(
6424                &CloseMultibufferItems {
6425                    save_intent: None,
6426                    close_pinned: false,
6427                },
6428                window,
6429                cx,
6430            )
6431        })
6432        .await
6433        .unwrap();
6434        assert_item_labels(&pane, ["A!", "C*"], cx);
6435
6436        pane.update_in(cx, |pane, window, cx| {
6437            let ix = pane.index_for_item_id(item_a.item_id()).unwrap();
6438            pane.unpin_tab_at(ix, window, cx);
6439            pane.close_multibuffer_items(
6440                &CloseMultibufferItems {
6441                    save_intent: None,
6442                    close_pinned: false,
6443                },
6444                window,
6445                cx,
6446            )
6447        })
6448        .await
6449        .unwrap();
6450
6451        assert_item_labels(&pane, ["C*"], cx);
6452
6453        add_labeled_item(&pane, "A", true, ItemBufferKind::Singleton, cx).update(cx, |item, cx| {
6454            item.project_items
6455                .push(TestProjectItem::new_dirty(1, "A.txt", cx))
6456        });
6457        add_labeled_item(&pane, "B", true, ItemBufferKind::Multibuffer, cx).update(
6458            cx,
6459            |item, cx| {
6460                item.project_items
6461                    .push(TestProjectItem::new_dirty(2, "B.txt", cx))
6462            },
6463        );
6464        add_labeled_item(&pane, "D", true, ItemBufferKind::Multibuffer, cx).update(
6465            cx,
6466            |item, cx| {
6467                item.project_items
6468                    .push(TestProjectItem::new_dirty(3, "D.txt", cx))
6469            },
6470        );
6471        assert_item_labels(&pane, ["C", "A^", "B^", "D*^"], cx);
6472
6473        let save = pane.update_in(cx, |pane, window, cx| {
6474            pane.close_multibuffer_items(
6475                &CloseMultibufferItems {
6476                    save_intent: None,
6477                    close_pinned: false,
6478                },
6479                window,
6480                cx,
6481            )
6482        });
6483
6484        cx.executor().run_until_parked();
6485        cx.simulate_prompt_answer("Save all");
6486        save.await.unwrap();
6487        assert_item_labels(&pane, ["C", "A*^"], cx);
6488
6489        add_labeled_item(&pane, "B", true, ItemBufferKind::Multibuffer, cx).update(
6490            cx,
6491            |item, cx| {
6492                item.project_items
6493                    .push(TestProjectItem::new_dirty(2, "B.txt", cx))
6494            },
6495        );
6496        add_labeled_item(&pane, "D", true, ItemBufferKind::Multibuffer, cx).update(
6497            cx,
6498            |item, cx| {
6499                item.project_items
6500                    .push(TestProjectItem::new_dirty(3, "D.txt", cx))
6501            },
6502        );
6503        assert_item_labels(&pane, ["C", "A^", "B^", "D*^"], cx);
6504        let save = pane.update_in(cx, |pane, window, cx| {
6505            pane.close_multibuffer_items(
6506                &CloseMultibufferItems {
6507                    save_intent: None,
6508                    close_pinned: false,
6509                },
6510                window,
6511                cx,
6512            )
6513        });
6514
6515        cx.executor().run_until_parked();
6516        cx.simulate_prompt_answer("Discard all");
6517        save.await.unwrap();
6518        assert_item_labels(&pane, ["C", "A*^"], cx);
6519    }
6520
6521    #[gpui::test]
6522    async fn test_close_with_save_intent(cx: &mut TestAppContext) {
6523        init_test(cx);
6524        let fs = FakeFs::new(cx.executor());
6525
6526        let project = Project::test(fs, None, cx).await;
6527        let (workspace, cx) =
6528            cx.add_window_view(|window, cx| Workspace::test_new(project, window, cx));
6529        let pane = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
6530
6531        let a = cx.update(|_, cx| TestProjectItem::new_dirty(1, "A.txt", cx));
6532        let b = cx.update(|_, cx| TestProjectItem::new_dirty(1, "B.txt", cx));
6533        let c = cx.update(|_, cx| TestProjectItem::new_dirty(1, "C.txt", cx));
6534
6535        add_labeled_item(&pane, "AB", true, cx).update(cx, |item, _| {
6536            item.project_items.push(a.clone());
6537            item.project_items.push(b.clone());
6538        });
6539        add_labeled_item(&pane, "C", true, cx)
6540            .update(cx, |item, _| item.project_items.push(c.clone()));
6541        assert_item_labels(&pane, ["AB^", "C*^"], cx);
6542
6543        pane.update_in(cx, |pane, window, cx| {
6544            pane.close_all_items(
6545                &CloseAllItems {
6546                    save_intent: Some(SaveIntent::Save),
6547                    close_pinned: false,
6548                },
6549                window,
6550                cx,
6551            )
6552        })
6553        .await
6554        .unwrap();
6555
6556        assert_item_labels(&pane, [], cx);
6557        cx.update(|_, cx| {
6558            assert!(!a.read(cx).is_dirty);
6559            assert!(!b.read(cx).is_dirty);
6560            assert!(!c.read(cx).is_dirty);
6561        });
6562    }
6563
6564    #[gpui::test]
6565    async fn test_new_tab_scrolls_into_view_completely(cx: &mut TestAppContext) {
6566        // Arrange
6567        init_test(cx);
6568        let fs = FakeFs::new(cx.executor());
6569
6570        let project = Project::test(fs, None, cx).await;
6571        let (workspace, cx) =
6572            cx.add_window_view(|window, cx| Workspace::test_new(project, window, cx));
6573        let pane = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
6574
6575        cx.simulate_resize(size(px(300.), px(300.)));
6576
6577        add_labeled_item(&pane, "untitled", false, cx);
6578        add_labeled_item(&pane, "untitled", false, cx);
6579        add_labeled_item(&pane, "untitled", false, cx);
6580        add_labeled_item(&pane, "untitled", false, cx);
6581        // Act: this should trigger a scroll
6582        add_labeled_item(&pane, "untitled", false, cx);
6583        // Assert
6584        let tab_bar_scroll_handle =
6585            pane.update_in(cx, |pane, _window, _cx| pane.tab_bar_scroll_handle.clone());
6586        assert_eq!(tab_bar_scroll_handle.children_count(), 6);
6587        let tab_bounds = cx.debug_bounds("TAB-3").unwrap();
6588        let new_tab_button_bounds = cx.debug_bounds("ICON-Plus").unwrap();
6589        let scroll_bounds = tab_bar_scroll_handle.bounds();
6590        let scroll_offset = tab_bar_scroll_handle.offset();
6591        assert!(tab_bounds.right() <= scroll_bounds.right() + scroll_offset.x);
6592        // -39.5 is the magic number for this setup
6593        assert_eq!(scroll_offset.x, px(-39.5));
6594        assert!(
6595            !tab_bounds.intersects(&new_tab_button_bounds),
6596            "Tab should not overlap with the new tab button, if this is failing check if there's been a redesign!"
6597        );
6598    }
6599
6600    #[gpui::test]
6601    async fn test_close_all_items_including_pinned(cx: &mut TestAppContext) {
6602        init_test(cx);
6603        let fs = FakeFs::new(cx.executor());
6604
6605        let project = Project::test(fs, None, cx).await;
6606        let (workspace, cx) =
6607            cx.add_window_view(|window, cx| Workspace::test_new(project, window, cx));
6608        let pane = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
6609
6610        let item_a = add_labeled_item(&pane, "A", false, cx);
6611        add_labeled_item(&pane, "B", false, cx);
6612        add_labeled_item(&pane, "C", false, cx);
6613        assert_item_labels(&pane, ["A", "B", "C*"], cx);
6614
6615        pane.update_in(cx, |pane, window, cx| {
6616            let ix = pane.index_for_item_id(item_a.item_id()).unwrap();
6617            pane.pin_tab_at(ix, window, cx);
6618            pane.close_all_items(
6619                &CloseAllItems {
6620                    save_intent: None,
6621                    close_pinned: true,
6622                },
6623                window,
6624                cx,
6625            )
6626        })
6627        .await
6628        .unwrap();
6629        assert_item_labels(&pane, [], cx);
6630    }
6631
6632    #[gpui::test]
6633    async fn test_close_pinned_tab_with_non_pinned_in_same_pane(cx: &mut TestAppContext) {
6634        init_test(cx);
6635        let fs = FakeFs::new(cx.executor());
6636        let project = Project::test(fs, None, cx).await;
6637        let (workspace, cx) =
6638            cx.add_window_view(|window, cx| Workspace::test_new(project, window, cx));
6639
6640        // Non-pinned tabs in same pane
6641        let pane = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
6642        add_labeled_item(&pane, "A", false, cx);
6643        add_labeled_item(&pane, "B", false, cx);
6644        add_labeled_item(&pane, "C", false, cx);
6645        pane.update_in(cx, |pane, window, cx| {
6646            pane.pin_tab_at(0, window, cx);
6647        });
6648        set_labeled_items(&pane, ["A*", "B", "C"], cx);
6649        pane.update_in(cx, |pane, window, cx| {
6650            pane.close_active_item(
6651                &CloseActiveItem {
6652                    save_intent: None,
6653                    close_pinned: false,
6654                },
6655                window,
6656                cx,
6657            )
6658            .unwrap();
6659        });
6660        // Non-pinned tab should be active
6661        assert_item_labels(&pane, ["A!", "B*", "C"], cx);
6662    }
6663
6664    #[gpui::test]
6665    async fn test_close_pinned_tab_with_non_pinned_in_different_pane(cx: &mut TestAppContext) {
6666        init_test(cx);
6667        let fs = FakeFs::new(cx.executor());
6668        let project = Project::test(fs, None, cx).await;
6669        let (workspace, cx) =
6670            cx.add_window_view(|window, cx| Workspace::test_new(project, window, cx));
6671
6672        // No non-pinned tabs in same pane, non-pinned tabs in another pane
6673        let pane1 = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
6674        let pane2 = workspace.update_in(cx, |workspace, window, cx| {
6675            workspace.split_pane(pane1.clone(), SplitDirection::Right, window, cx)
6676        });
6677        add_labeled_item(&pane1, "A", false, cx);
6678        pane1.update_in(cx, |pane, window, cx| {
6679            pane.pin_tab_at(0, window, cx);
6680        });
6681        set_labeled_items(&pane1, ["A*"], cx);
6682        add_labeled_item(&pane2, "B", false, cx);
6683        set_labeled_items(&pane2, ["B"], cx);
6684        pane1.update_in(cx, |pane, window, cx| {
6685            pane.close_active_item(
6686                &CloseActiveItem {
6687                    save_intent: None,
6688                    close_pinned: false,
6689                },
6690                window,
6691                cx,
6692            )
6693            .unwrap();
6694        });
6695        //  Non-pinned tab of other pane should be active
6696        assert_item_labels(&pane2, ["B*"], cx);
6697    }
6698
6699    #[gpui::test]
6700    async fn ensure_item_closing_actions_do_not_panic_when_no_items_exist(cx: &mut TestAppContext) {
6701        init_test(cx);
6702        let fs = FakeFs::new(cx.executor());
6703        let project = Project::test(fs, None, cx).await;
6704        let (workspace, cx) =
6705            cx.add_window_view(|window, cx| Workspace::test_new(project, window, cx));
6706
6707        let pane = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
6708        assert_item_labels(&pane, [], cx);
6709
6710        pane.update_in(cx, |pane, window, cx| {
6711            pane.close_active_item(
6712                &CloseActiveItem {
6713                    save_intent: None,
6714                    close_pinned: false,
6715                },
6716                window,
6717                cx,
6718            )
6719        })
6720        .await
6721        .unwrap();
6722
6723        pane.update_in(cx, |pane, window, cx| {
6724            pane.close_other_items(
6725                &CloseOtherItems {
6726                    save_intent: None,
6727                    close_pinned: false,
6728                },
6729                None,
6730                window,
6731                cx,
6732            )
6733        })
6734        .await
6735        .unwrap();
6736
6737        pane.update_in(cx, |pane, window, cx| {
6738            pane.close_all_items(
6739                &CloseAllItems {
6740                    save_intent: None,
6741                    close_pinned: false,
6742                },
6743                window,
6744                cx,
6745            )
6746        })
6747        .await
6748        .unwrap();
6749
6750        pane.update_in(cx, |pane, window, cx| {
6751            pane.close_clean_items(
6752                &CloseCleanItems {
6753                    close_pinned: false,
6754                },
6755                window,
6756                cx,
6757            )
6758        })
6759        .await
6760        .unwrap();
6761
6762        pane.update_in(cx, |pane, window, cx| {
6763            pane.close_items_to_the_right_by_id(
6764                None,
6765                &CloseItemsToTheRight {
6766                    close_pinned: false,
6767                },
6768                window,
6769                cx,
6770            )
6771        })
6772        .await
6773        .unwrap();
6774
6775        pane.update_in(cx, |pane, window, cx| {
6776            pane.close_items_to_the_left_by_id(
6777                None,
6778                &CloseItemsToTheLeft {
6779                    close_pinned: false,
6780                },
6781                window,
6782                cx,
6783            )
6784        })
6785        .await
6786        .unwrap();
6787    }
6788
6789    #[gpui::test]
6790    async fn test_item_swapping_actions(cx: &mut TestAppContext) {
6791        init_test(cx);
6792        let fs = FakeFs::new(cx.executor());
6793        let project = Project::test(fs, None, cx).await;
6794        let (workspace, cx) =
6795            cx.add_window_view(|window, cx| Workspace::test_new(project, window, cx));
6796
6797        let pane = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
6798        assert_item_labels(&pane, [], cx);
6799
6800        // Test that these actions do not panic
6801        pane.update_in(cx, |pane, window, cx| {
6802            pane.swap_item_right(&Default::default(), window, cx);
6803        });
6804
6805        pane.update_in(cx, |pane, window, cx| {
6806            pane.swap_item_left(&Default::default(), window, cx);
6807        });
6808
6809        add_labeled_item(&pane, "A", false, cx);
6810        add_labeled_item(&pane, "B", false, cx);
6811        add_labeled_item(&pane, "C", false, cx);
6812        assert_item_labels(&pane, ["A", "B", "C*"], cx);
6813
6814        pane.update_in(cx, |pane, window, cx| {
6815            pane.swap_item_right(&Default::default(), window, cx);
6816        });
6817        assert_item_labels(&pane, ["A", "B", "C*"], cx);
6818
6819        pane.update_in(cx, |pane, window, cx| {
6820            pane.swap_item_left(&Default::default(), window, cx);
6821        });
6822        assert_item_labels(&pane, ["A", "C*", "B"], cx);
6823
6824        pane.update_in(cx, |pane, window, cx| {
6825            pane.swap_item_left(&Default::default(), window, cx);
6826        });
6827        assert_item_labels(&pane, ["C*", "A", "B"], cx);
6828
6829        pane.update_in(cx, |pane, window, cx| {
6830            pane.swap_item_left(&Default::default(), window, cx);
6831        });
6832        assert_item_labels(&pane, ["C*", "A", "B"], cx);
6833
6834        pane.update_in(cx, |pane, window, cx| {
6835            pane.swap_item_right(&Default::default(), window, cx);
6836        });
6837        assert_item_labels(&pane, ["A", "C*", "B"], cx);
6838    }
6839
6840    fn init_test(cx: &mut TestAppContext) {
6841        cx.update(|cx| {
6842            let settings_store = SettingsStore::test(cx);
6843            cx.set_global(settings_store);
6844            theme::init(LoadThemes::JustBase, cx);
6845            crate::init_settings(cx);
6846            Project::init_settings(cx);
6847        });
6848    }
6849
6850    fn set_max_tabs(cx: &mut TestAppContext, value: Option<usize>) {
6851        cx.update_global(|store: &mut SettingsStore, cx| {
6852            store.update_user_settings(cx, |settings| {
6853                settings.workspace.max_tabs = value.map(|v| NonZero::new(v).unwrap())
6854            });
6855        });
6856    }
6857
6858    fn add_labeled_item(
6859        pane: &Entity<Pane>,
6860        label: &str,
6861        is_dirty: bool,
6862        cx: &mut VisualTestContext,
6863    ) -> Box<Entity<TestItem>> {
6864        pane.update_in(cx, |pane, window, cx| {
6865            let labeled_item =
6866                Box::new(cx.new(|cx| TestItem::new(cx).with_label(label).with_dirty(is_dirty)));
6867            pane.add_item(labeled_item.clone(), false, false, None, window, cx);
6868            labeled_item
6869        })
6870    }
6871
6872    fn set_labeled_items<const COUNT: usize>(
6873        pane: &Entity<Pane>,
6874        labels: [&str; COUNT],
6875        cx: &mut VisualTestContext,
6876    ) -> [Box<Entity<TestItem>>; COUNT] {
6877        pane.update_in(cx, |pane, window, cx| {
6878            pane.items.clear();
6879            let mut active_item_index = 0;
6880
6881            let mut index = 0;
6882            let items = labels.map(|mut label| {
6883                if label.ends_with('*') {
6884                    label = label.trim_end_matches('*');
6885                    active_item_index = index;
6886                }
6887
6888                let labeled_item = Box::new(cx.new(|cx| TestItem::new(cx).with_label(label)));
6889                pane.add_item(labeled_item.clone(), false, false, None, window, cx);
6890                index += 1;
6891                labeled_item
6892            });
6893
6894            pane.activate_item(active_item_index, false, false, window, cx);
6895
6896            items
6897        })
6898    }
6899
6900    // Assert the item label, with the active item label suffixed with a '*'
6901    #[track_caller]
6902    fn assert_item_labels<const COUNT: usize>(
6903        pane: &Entity<Pane>,
6904        expected_states: [&str; COUNT],
6905        cx: &mut VisualTestContext,
6906    ) {
6907        let actual_states = pane.update(cx, |pane, cx| {
6908            pane.items
6909                .iter()
6910                .enumerate()
6911                .map(|(ix, item)| {
6912                    let mut state = item
6913                        .to_any()
6914                        .downcast::<TestItem>()
6915                        .unwrap()
6916                        .read(cx)
6917                        .label
6918                        .clone();
6919                    if ix == pane.active_item_index {
6920                        state.push('*');
6921                    }
6922                    if item.is_dirty(cx) {
6923                        state.push('^');
6924                    }
6925                    if pane.is_tab_pinned(ix) {
6926                        state.push('!');
6927                    }
6928                    state
6929                })
6930                .collect::<Vec<_>>()
6931        });
6932        assert_eq!(
6933            actual_states, expected_states,
6934            "pane items do not match expectation"
6935        );
6936    }
6937}