1mod dragged_item_receiver;
   2
   3use super::{ItemHandle, SplitDirection};
   4use crate::{
   5    item::WeakItemHandle, notify_of_new_dock, toolbar::Toolbar, AutosaveSetting, Item,
   6    NewCenterTerminal, NewFile, NewSearch, ToggleZoom, Workspace, WorkspaceSettings,
   7};
   8use anyhow::Result;
   9use collections::{HashMap, HashSet, VecDeque};
  10use context_menu::{ContextMenu, ContextMenuItem};
  11use drag_and_drop::{DragAndDrop, Draggable};
  12use dragged_item_receiver::dragged_item_receiver;
  13use futures::StreamExt;
  14use gpui::{
  15    actions,
  16    elements::*,
  17    geometry::{
  18        rect::RectF,
  19        vector::{vec2f, Vector2F},
  20    },
  21    impl_actions,
  22    keymap_matcher::KeymapContext,
  23    platform::{CursorStyle, MouseButton, NavigationDirection, PromptLevel},
  24    Action, AnyViewHandle, AnyWeakViewHandle, AppContext, AsyncAppContext, Entity, EventContext,
  25    LayoutContext, ModelHandle, MouseRegion, Quad, Task, View, ViewContext, ViewHandle,
  26    WeakViewHandle, WindowContext,
  27};
  28use project::{Project, ProjectEntryId, ProjectPath};
  29use serde::Deserialize;
  30use std::{
  31    any::Any,
  32    cell::RefCell,
  33    cmp, mem,
  34    path::{Path, PathBuf},
  35    rc::Rc,
  36    sync::{
  37        atomic::{AtomicUsize, Ordering},
  38        Arc,
  39    },
  40};
  41use theme::{Theme, ThemeSettings};
  42
  43#[derive(Clone, Deserialize, PartialEq)]
  44pub struct ActivateItem(pub usize);
  45
  46#[derive(Clone, PartialEq)]
  47pub struct CloseItemById {
  48    pub item_id: usize,
  49    pub pane: WeakViewHandle<Pane>,
  50}
  51
  52#[derive(Clone, PartialEq)]
  53pub struct CloseItemsToTheLeftById {
  54    pub item_id: usize,
  55    pub pane: WeakViewHandle<Pane>,
  56}
  57
  58#[derive(Clone, PartialEq)]
  59pub struct CloseItemsToTheRightById {
  60    pub item_id: usize,
  61    pub pane: WeakViewHandle<Pane>,
  62}
  63
  64actions!(
  65    pane,
  66    [
  67        ActivatePrevItem,
  68        ActivateNextItem,
  69        ActivateLastItem,
  70        CloseActiveItem,
  71        CloseInactiveItems,
  72        CloseCleanItems,
  73        CloseItemsToTheLeft,
  74        CloseItemsToTheRight,
  75        CloseAllItems,
  76        GoBack,
  77        GoForward,
  78        ReopenClosedItem,
  79        SplitLeft,
  80        SplitUp,
  81        SplitRight,
  82        SplitDown,
  83    ]
  84);
  85
  86impl_actions!(pane, [ActivateItem]);
  87
  88const MAX_NAVIGATION_HISTORY_LEN: usize = 1024;
  89
  90pub type BackgroundActions = fn() -> &'static [(&'static str, &'static dyn Action)];
  91
  92pub fn init(cx: &mut AppContext) {
  93    cx.add_action(Pane::toggle_zoom);
  94    cx.add_action(|pane: &mut Pane, action: &ActivateItem, cx| {
  95        pane.activate_item(action.0, true, true, cx);
  96    });
  97    cx.add_action(|pane: &mut Pane, _: &ActivateLastItem, cx| {
  98        pane.activate_item(pane.items.len() - 1, true, true, cx);
  99    });
 100    cx.add_action(|pane: &mut Pane, _: &ActivatePrevItem, cx| {
 101        pane.activate_prev_item(true, cx);
 102    });
 103    cx.add_action(|pane: &mut Pane, _: &ActivateNextItem, cx| {
 104        pane.activate_next_item(true, cx);
 105    });
 106    cx.add_async_action(Pane::close_active_item);
 107    cx.add_async_action(Pane::close_inactive_items);
 108    cx.add_async_action(Pane::close_clean_items);
 109    cx.add_async_action(Pane::close_items_to_the_left);
 110    cx.add_async_action(Pane::close_items_to_the_right);
 111    cx.add_async_action(Pane::close_all_items);
 112    cx.add_action(|pane: &mut Pane, _: &SplitLeft, cx| pane.split(SplitDirection::Left, cx));
 113    cx.add_action(|pane: &mut Pane, _: &SplitUp, cx| pane.split(SplitDirection::Up, cx));
 114    cx.add_action(|pane: &mut Pane, _: &SplitRight, cx| pane.split(SplitDirection::Right, cx));
 115    cx.add_action(|pane: &mut Pane, _: &SplitDown, cx| pane.split(SplitDirection::Down, cx));
 116}
 117
 118#[derive(Debug)]
 119pub enum Event {
 120    AddItem { item: Box<dyn ItemHandle> },
 121    ActivateItem { local: bool },
 122    Remove,
 123    RemoveItem { item_id: usize },
 124    Split(SplitDirection),
 125    ChangeItemTitle,
 126    Focus,
 127    ZoomIn,
 128    ZoomOut,
 129}
 130
 131pub struct Pane {
 132    items: Vec<Box<dyn ItemHandle>>,
 133    activation_history: Vec<usize>,
 134    zoomed: bool,
 135    active_item_index: usize,
 136    last_focused_view_by_item: HashMap<usize, AnyWeakViewHandle>,
 137    autoscroll: bool,
 138    nav_history: NavHistory,
 139    toolbar: ViewHandle<Toolbar>,
 140    tab_bar_context_menu: TabBarContextMenu,
 141    tab_context_menu: ViewHandle<ContextMenu>,
 142    _background_actions: BackgroundActions,
 143    workspace: WeakViewHandle<Workspace>,
 144    project: ModelHandle<Project>,
 145    has_focus: bool,
 146    can_drop: Rc<dyn Fn(&DragAndDrop<Workspace>, &WindowContext) -> bool>,
 147    can_split: bool,
 148    render_tab_bar_buttons: Rc<dyn Fn(&mut Pane, &mut ViewContext<Pane>) -> AnyElement<Pane>>,
 149}
 150
 151pub struct ItemNavHistory {
 152    history: NavHistory,
 153    item: Rc<dyn WeakItemHandle>,
 154}
 155
 156#[derive(Clone)]
 157pub struct NavHistory(Rc<RefCell<NavHistoryState>>);
 158
 159struct NavHistoryState {
 160    mode: NavigationMode,
 161    backward_stack: VecDeque<NavigationEntry>,
 162    forward_stack: VecDeque<NavigationEntry>,
 163    closed_stack: VecDeque<NavigationEntry>,
 164    paths_by_item: HashMap<usize, (ProjectPath, Option<PathBuf>)>,
 165    pane: WeakViewHandle<Pane>,
 166    next_timestamp: Arc<AtomicUsize>,
 167}
 168
 169#[derive(Copy, Clone)]
 170pub enum NavigationMode {
 171    Normal,
 172    GoingBack,
 173    GoingForward,
 174    ClosingItem,
 175    ReopeningClosedItem,
 176    Disabled,
 177}
 178
 179impl Default for NavigationMode {
 180    fn default() -> Self {
 181        Self::Normal
 182    }
 183}
 184
 185pub struct NavigationEntry {
 186    pub item: Rc<dyn WeakItemHandle>,
 187    pub data: Option<Box<dyn Any>>,
 188    pub timestamp: usize,
 189}
 190
 191pub struct DraggedItem {
 192    pub handle: Box<dyn ItemHandle>,
 193    pub pane: WeakViewHandle<Pane>,
 194}
 195
 196pub enum ReorderBehavior {
 197    None,
 198    MoveAfterActive,
 199    MoveToIndex(usize),
 200}
 201
 202#[derive(Debug, Clone, Copy, PartialEq, Eq)]
 203enum TabBarContextMenuKind {
 204    New,
 205    Split,
 206}
 207
 208struct TabBarContextMenu {
 209    kind: TabBarContextMenuKind,
 210    handle: ViewHandle<ContextMenu>,
 211}
 212
 213impl TabBarContextMenu {
 214    fn handle_if_kind(&self, kind: TabBarContextMenuKind) -> Option<ViewHandle<ContextMenu>> {
 215        if self.kind == kind {
 216            return Some(self.handle.clone());
 217        }
 218        None
 219    }
 220}
 221
 222impl Pane {
 223    pub fn new(
 224        workspace: WeakViewHandle<Workspace>,
 225        project: ModelHandle<Project>,
 226        background_actions: BackgroundActions,
 227        next_timestamp: Arc<AtomicUsize>,
 228        cx: &mut ViewContext<Self>,
 229    ) -> Self {
 230        let pane_view_id = cx.view_id();
 231        let handle = cx.weak_handle();
 232        let context_menu = cx.add_view(|cx| ContextMenu::new(pane_view_id, cx));
 233        context_menu.update(cx, |menu, _| {
 234            menu.set_position_mode(OverlayPositionMode::Local)
 235        });
 236
 237        Self {
 238            items: Vec::new(),
 239            activation_history: Vec::new(),
 240            zoomed: false,
 241            active_item_index: 0,
 242            last_focused_view_by_item: Default::default(),
 243            autoscroll: false,
 244            nav_history: NavHistory(Rc::new(RefCell::new(NavHistoryState {
 245                mode: NavigationMode::Normal,
 246                backward_stack: Default::default(),
 247                forward_stack: Default::default(),
 248                closed_stack: Default::default(),
 249                paths_by_item: Default::default(),
 250                pane: handle.clone(),
 251                next_timestamp,
 252            }))),
 253            toolbar: cx.add_view(|_| Toolbar::new(handle)),
 254            tab_bar_context_menu: TabBarContextMenu {
 255                kind: TabBarContextMenuKind::New,
 256                handle: context_menu,
 257            },
 258            tab_context_menu: cx.add_view(|cx| ContextMenu::new(pane_view_id, cx)),
 259            _background_actions: background_actions,
 260            workspace,
 261            project,
 262            has_focus: false,
 263            can_drop: Rc::new(|_, _| true),
 264            can_split: true,
 265            render_tab_bar_buttons: Rc::new(|pane, cx| {
 266                Flex::row()
 267                    // New menu
 268                    .with_child(Self::render_tab_bar_button(
 269                        0,
 270                        "icons/plus_12.svg",
 271                        false,
 272                        Some(("New...".into(), None)),
 273                        cx,
 274                        |pane, cx| pane.deploy_new_menu(cx),
 275                        pane.tab_bar_context_menu
 276                            .handle_if_kind(TabBarContextMenuKind::New),
 277                    ))
 278                    .with_child(Self::render_tab_bar_button(
 279                        1,
 280                        "icons/split_12.svg",
 281                        false,
 282                        Some(("Split Pane".into(), None)),
 283                        cx,
 284                        |pane, cx| pane.deploy_split_menu(cx),
 285                        pane.tab_bar_context_menu
 286                            .handle_if_kind(TabBarContextMenuKind::Split),
 287                    ))
 288                    .with_child(Pane::render_tab_bar_button(
 289                        2,
 290                        if pane.is_zoomed() {
 291                            "icons/minimize_8.svg"
 292                        } else {
 293                            "icons/maximize_8.svg"
 294                        },
 295                        pane.is_zoomed(),
 296                        Some(("Toggle Zoom".into(), Some(Box::new(ToggleZoom)))),
 297                        cx,
 298                        move |pane, cx| pane.toggle_zoom(&Default::default(), cx),
 299                        None,
 300                    ))
 301                    .into_any()
 302            }),
 303        }
 304    }
 305
 306    pub(crate) fn workspace(&self) -> &WeakViewHandle<Workspace> {
 307        &self.workspace
 308    }
 309
 310    pub fn has_focus(&self) -> bool {
 311        self.has_focus
 312    }
 313
 314    pub fn active_item_index(&self) -> usize {
 315        self.active_item_index
 316    }
 317
 318    pub fn on_can_drop<F>(&mut self, can_drop: F)
 319    where
 320        F: 'static + Fn(&DragAndDrop<Workspace>, &WindowContext) -> bool,
 321    {
 322        self.can_drop = Rc::new(can_drop);
 323    }
 324
 325    pub fn set_can_split(&mut self, can_split: bool, cx: &mut ViewContext<Self>) {
 326        self.can_split = can_split;
 327        cx.notify();
 328    }
 329
 330    pub fn set_can_navigate(&mut self, can_navigate: bool, cx: &mut ViewContext<Self>) {
 331        self.toolbar.update(cx, |toolbar, cx| {
 332            toolbar.set_can_navigate(can_navigate, cx);
 333        });
 334        cx.notify();
 335    }
 336
 337    pub fn set_render_tab_bar_buttons<F>(&mut self, cx: &mut ViewContext<Self>, render: F)
 338    where
 339        F: 'static + Fn(&mut Pane, &mut ViewContext<Pane>) -> AnyElement<Pane>,
 340    {
 341        self.render_tab_bar_buttons = Rc::new(render);
 342        cx.notify();
 343    }
 344
 345    pub fn nav_history_for_item<T: Item>(&self, item: &ViewHandle<T>) -> ItemNavHistory {
 346        ItemNavHistory {
 347            history: self.nav_history.clone(),
 348            item: Rc::new(item.downgrade()),
 349        }
 350    }
 351
 352    pub fn nav_history(&self) -> &NavHistory {
 353        &self.nav_history
 354    }
 355
 356    pub fn nav_history_mut(&mut self) -> &mut NavHistory {
 357        &mut self.nav_history
 358    }
 359
 360    pub fn disable_history(&mut self) {
 361        self.nav_history.disable();
 362    }
 363
 364    pub fn enable_history(&mut self) {
 365        self.nav_history.enable();
 366    }
 367
 368    pub fn can_navigate_backward(&self) -> bool {
 369        !self.nav_history.0.borrow().backward_stack.is_empty()
 370    }
 371
 372    pub fn can_navigate_forward(&self) -> bool {
 373        !self.nav_history.0.borrow().forward_stack.is_empty()
 374    }
 375
 376    fn history_updated(&mut self, cx: &mut ViewContext<Self>) {
 377        self.toolbar.update(cx, |_, cx| cx.notify());
 378    }
 379
 380    pub(crate) fn open_item(
 381        &mut self,
 382        project_entry_id: ProjectEntryId,
 383        focus_item: bool,
 384        cx: &mut ViewContext<Self>,
 385        build_item: impl FnOnce(&mut ViewContext<Pane>) -> Box<dyn ItemHandle>,
 386    ) -> Box<dyn ItemHandle> {
 387        let mut existing_item = None;
 388        for (index, item) in self.items.iter().enumerate() {
 389            if item.is_singleton(cx) && item.project_entry_ids(cx).as_slice() == [project_entry_id]
 390            {
 391                let item = item.boxed_clone();
 392                existing_item = Some((index, item));
 393                break;
 394            }
 395        }
 396
 397        if let Some((index, existing_item)) = existing_item {
 398            self.activate_item(index, focus_item, focus_item, cx);
 399            existing_item
 400        } else {
 401            let new_item = build_item(cx);
 402            self.add_item(new_item.clone(), true, focus_item, None, cx);
 403            new_item
 404        }
 405    }
 406
 407    pub fn add_item(
 408        &mut self,
 409        item: Box<dyn ItemHandle>,
 410        activate_pane: bool,
 411        focus_item: bool,
 412        destination_index: Option<usize>,
 413        cx: &mut ViewContext<Self>,
 414    ) {
 415        if item.is_singleton(cx) {
 416            if let Some(&entry_id) = item.project_entry_ids(cx).get(0) {
 417                let project = self.project.read(cx);
 418                if let Some(project_path) = project.path_for_entry(entry_id, cx) {
 419                    let abs_path = project.absolute_path(&project_path, cx);
 420                    self.nav_history
 421                        .0
 422                        .borrow_mut()
 423                        .paths_by_item
 424                        .insert(item.id(), (project_path, abs_path));
 425                }
 426            }
 427        }
 428        // If no destination index is specified, add or move the item after the active item.
 429        let mut insertion_index = {
 430            cmp::min(
 431                if let Some(destination_index) = destination_index {
 432                    destination_index
 433                } else {
 434                    self.active_item_index + 1
 435                },
 436                self.items.len(),
 437            )
 438        };
 439
 440        // Does the item already exist?
 441        let project_entry_id = if item.is_singleton(cx) {
 442            item.project_entry_ids(cx).get(0).copied()
 443        } else {
 444            None
 445        };
 446
 447        let existing_item_index = self.items.iter().position(|existing_item| {
 448            if existing_item.id() == item.id() {
 449                true
 450            } else if existing_item.is_singleton(cx) {
 451                existing_item
 452                    .project_entry_ids(cx)
 453                    .get(0)
 454                    .map_or(false, |existing_entry_id| {
 455                        Some(existing_entry_id) == project_entry_id.as_ref()
 456                    })
 457            } else {
 458                false
 459            }
 460        });
 461
 462        if let Some(existing_item_index) = existing_item_index {
 463            // If the item already exists, move it to the desired destination and activate it
 464
 465            if existing_item_index != insertion_index {
 466                let existing_item_is_active = existing_item_index == self.active_item_index;
 467
 468                // If the caller didn't specify a destination and the added item is already
 469                // the active one, don't move it
 470                if existing_item_is_active && destination_index.is_none() {
 471                    insertion_index = existing_item_index;
 472                } else {
 473                    self.items.remove(existing_item_index);
 474                    if existing_item_index < self.active_item_index {
 475                        self.active_item_index -= 1;
 476                    }
 477                    insertion_index = insertion_index.min(self.items.len());
 478
 479                    self.items.insert(insertion_index, item.clone());
 480
 481                    if existing_item_is_active {
 482                        self.active_item_index = insertion_index;
 483                    } else if insertion_index <= self.active_item_index {
 484                        self.active_item_index += 1;
 485                    }
 486                }
 487
 488                cx.notify();
 489            }
 490
 491            self.activate_item(insertion_index, activate_pane, focus_item, cx);
 492        } else {
 493            self.items.insert(insertion_index, item.clone());
 494            if insertion_index <= self.active_item_index {
 495                self.active_item_index += 1;
 496            }
 497
 498            self.activate_item(insertion_index, activate_pane, focus_item, cx);
 499            cx.notify();
 500        }
 501
 502        cx.emit(Event::AddItem { item });
 503    }
 504
 505    pub fn items_len(&self) -> usize {
 506        self.items.len()
 507    }
 508
 509    pub fn items(&self) -> impl Iterator<Item = &Box<dyn ItemHandle>> + DoubleEndedIterator {
 510        self.items.iter()
 511    }
 512
 513    pub fn items_of_type<T: View>(&self) -> impl '_ + Iterator<Item = ViewHandle<T>> {
 514        self.items
 515            .iter()
 516            .filter_map(|item| item.as_any().clone().downcast())
 517    }
 518
 519    pub fn active_item(&self) -> Option<Box<dyn ItemHandle>> {
 520        self.items.get(self.active_item_index).cloned()
 521    }
 522
 523    pub fn item_for_entry(
 524        &self,
 525        entry_id: ProjectEntryId,
 526        cx: &AppContext,
 527    ) -> Option<Box<dyn ItemHandle>> {
 528        self.items.iter().find_map(|item| {
 529            if item.is_singleton(cx) && item.project_entry_ids(cx).as_slice() == [entry_id] {
 530                Some(item.boxed_clone())
 531            } else {
 532                None
 533            }
 534        })
 535    }
 536
 537    pub fn index_for_item(&self, item: &dyn ItemHandle) -> Option<usize> {
 538        self.items.iter().position(|i| i.id() == item.id())
 539    }
 540
 541    pub fn toggle_zoom(&mut self, _: &ToggleZoom, cx: &mut ViewContext<Self>) {
 542        // Potentially warn the user of the new keybinding
 543        let workspace_handle = self.workspace().clone();
 544        cx.spawn(|_, mut cx| async move { notify_of_new_dock(&workspace_handle, &mut cx) })
 545            .detach();
 546
 547        if self.zoomed {
 548            cx.emit(Event::ZoomOut);
 549        } else if !self.items.is_empty() {
 550            if !self.has_focus {
 551                cx.focus_self();
 552            }
 553            cx.emit(Event::ZoomIn);
 554        }
 555    }
 556
 557    pub fn activate_item(
 558        &mut self,
 559        index: usize,
 560        activate_pane: bool,
 561        focus_item: bool,
 562        cx: &mut ViewContext<Self>,
 563    ) {
 564        use NavigationMode::{GoingBack, GoingForward};
 565
 566        if index < self.items.len() {
 567            let prev_active_item_ix = mem::replace(&mut self.active_item_index, index);
 568            if prev_active_item_ix != self.active_item_index
 569                || matches!(self.nav_history.mode(), GoingBack | GoingForward)
 570            {
 571                if let Some(prev_item) = self.items.get(prev_active_item_ix) {
 572                    prev_item.deactivated(cx);
 573                }
 574
 575                cx.emit(Event::ActivateItem {
 576                    local: activate_pane,
 577                });
 578            }
 579
 580            if let Some(newly_active_item) = self.items.get(index) {
 581                self.activation_history
 582                    .retain(|&previously_active_item_id| {
 583                        previously_active_item_id != newly_active_item.id()
 584                    });
 585                self.activation_history.push(newly_active_item.id());
 586            }
 587
 588            self.update_toolbar(cx);
 589
 590            if focus_item {
 591                self.focus_active_item(cx);
 592            }
 593
 594            self.autoscroll = true;
 595            cx.notify();
 596        }
 597    }
 598
 599    pub fn activate_prev_item(&mut self, activate_pane: bool, cx: &mut ViewContext<Self>) {
 600        let mut index = self.active_item_index;
 601        if index > 0 {
 602            index -= 1;
 603        } else if !self.items.is_empty() {
 604            index = self.items.len() - 1;
 605        }
 606        self.activate_item(index, activate_pane, activate_pane, cx);
 607    }
 608
 609    pub fn activate_next_item(&mut self, activate_pane: bool, cx: &mut ViewContext<Self>) {
 610        let mut index = self.active_item_index;
 611        if index + 1 < self.items.len() {
 612            index += 1;
 613        } else {
 614            index = 0;
 615        }
 616        self.activate_item(index, activate_pane, activate_pane, cx);
 617    }
 618
 619    pub fn close_active_item(
 620        &mut self,
 621        _: &CloseActiveItem,
 622        cx: &mut ViewContext<Self>,
 623    ) -> Option<Task<Result<()>>> {
 624        if self.items.is_empty() {
 625            return None;
 626        }
 627        let active_item_id = self.items[self.active_item_index].id();
 628        Some(self.close_item_by_id(active_item_id, cx))
 629    }
 630
 631    pub fn close_item_by_id(
 632        &mut self,
 633        item_id_to_close: usize,
 634        cx: &mut ViewContext<Self>,
 635    ) -> Task<Result<()>> {
 636        self.close_items(cx, move |view_id| view_id == item_id_to_close)
 637    }
 638
 639    pub fn close_inactive_items(
 640        &mut self,
 641        _: &CloseInactiveItems,
 642        cx: &mut ViewContext<Self>,
 643    ) -> Option<Task<Result<()>>> {
 644        if self.items.is_empty() {
 645            return None;
 646        }
 647
 648        let active_item_id = self.items[self.active_item_index].id();
 649        Some(self.close_items(cx, move |item_id| item_id != active_item_id))
 650    }
 651
 652    pub fn close_clean_items(
 653        &mut self,
 654        _: &CloseCleanItems,
 655        cx: &mut ViewContext<Self>,
 656    ) -> Option<Task<Result<()>>> {
 657        let item_ids: Vec<_> = self
 658            .items()
 659            .filter(|item| !item.is_dirty(cx))
 660            .map(|item| item.id())
 661            .collect();
 662        Some(self.close_items(cx, move |item_id| item_ids.contains(&item_id)))
 663    }
 664
 665    pub fn close_items_to_the_left(
 666        &mut self,
 667        _: &CloseItemsToTheLeft,
 668        cx: &mut ViewContext<Self>,
 669    ) -> Option<Task<Result<()>>> {
 670        if self.items.is_empty() {
 671            return None;
 672        }
 673        let active_item_id = self.items[self.active_item_index].id();
 674        Some(self.close_items_to_the_left_by_id(active_item_id, cx))
 675    }
 676
 677    pub fn close_items_to_the_left_by_id(
 678        &mut self,
 679        item_id: usize,
 680        cx: &mut ViewContext<Self>,
 681    ) -> Task<Result<()>> {
 682        let item_ids: Vec<_> = self
 683            .items()
 684            .take_while(|item| item.id() != item_id)
 685            .map(|item| item.id())
 686            .collect();
 687        self.close_items(cx, move |item_id| item_ids.contains(&item_id))
 688    }
 689
 690    pub fn close_items_to_the_right(
 691        &mut self,
 692        _: &CloseItemsToTheRight,
 693        cx: &mut ViewContext<Self>,
 694    ) -> Option<Task<Result<()>>> {
 695        if self.items.is_empty() {
 696            return None;
 697        }
 698        let active_item_id = self.items[self.active_item_index].id();
 699        Some(self.close_items_to_the_right_by_id(active_item_id, cx))
 700    }
 701
 702    pub fn close_items_to_the_right_by_id(
 703        &mut self,
 704        item_id: usize,
 705        cx: &mut ViewContext<Self>,
 706    ) -> Task<Result<()>> {
 707        let item_ids: Vec<_> = self
 708            .items()
 709            .rev()
 710            .take_while(|item| item.id() != item_id)
 711            .map(|item| item.id())
 712            .collect();
 713        self.close_items(cx, move |item_id| item_ids.contains(&item_id))
 714    }
 715
 716    pub fn close_all_items(
 717        &mut self,
 718        _: &CloseAllItems,
 719        cx: &mut ViewContext<Self>,
 720    ) -> Option<Task<Result<()>>> {
 721        Some(self.close_items(cx, move |_| true))
 722    }
 723
 724    pub fn close_items(
 725        &mut self,
 726        cx: &mut ViewContext<Pane>,
 727        should_close: impl 'static + Fn(usize) -> bool,
 728    ) -> Task<Result<()>> {
 729        // Find the items to close.
 730        let mut items_to_close = Vec::new();
 731        for item in &self.items {
 732            if should_close(item.id()) {
 733                items_to_close.push(item.boxed_clone());
 734            }
 735        }
 736
 737        // If a buffer is open both in a singleton editor and in a multibuffer, make sure
 738        // to focus the singleton buffer when prompting to save that buffer, as opposed
 739        // to focusing the multibuffer, because this gives the user a more clear idea
 740        // of what content they would be saving.
 741        items_to_close.sort_by_key(|item| !item.is_singleton(cx));
 742
 743        let workspace = self.workspace.clone();
 744        cx.spawn(|pane, mut cx| async move {
 745            let mut saved_project_items_ids = HashSet::default();
 746            for item in items_to_close.clone() {
 747                // Find the item's current index and its set of project item models. Avoid
 748                // storing these in advance, in case they have changed since this task
 749                // was started.
 750                let (item_ix, mut project_item_ids) = pane.read_with(&cx, |pane, cx| {
 751                    (pane.index_for_item(&*item), item.project_item_model_ids(cx))
 752                })?;
 753                let item_ix = if let Some(ix) = item_ix {
 754                    ix
 755                } else {
 756                    continue;
 757                };
 758
 759                // Check if this view has any project items that are not open anywhere else
 760                // in the workspace, AND that the user has not already been prompted to save.
 761                // If there are any such project entries, prompt the user to save this item.
 762                let project = workspace.read_with(&cx, |workspace, cx| {
 763                    for item in workspace.items(cx) {
 764                        if !items_to_close
 765                            .iter()
 766                            .any(|item_to_close| item_to_close.id() == item.id())
 767                        {
 768                            let other_project_item_ids = item.project_item_model_ids(cx);
 769                            project_item_ids.retain(|id| !other_project_item_ids.contains(id));
 770                        }
 771                    }
 772                    workspace.project().clone()
 773                })?;
 774                let should_save = project_item_ids
 775                    .iter()
 776                    .any(|id| saved_project_items_ids.insert(*id));
 777
 778                if should_save
 779                    && !Self::save_item(project.clone(), &pane, item_ix, &*item, true, &mut cx)
 780                        .await?
 781                {
 782                    break;
 783                }
 784
 785                // Remove the item from the pane.
 786                pane.update(&mut cx, |pane, cx| {
 787                    if let Some(item_ix) = pane.items.iter().position(|i| i.id() == item.id()) {
 788                        pane.remove_item(item_ix, false, cx);
 789                    }
 790                })?;
 791            }
 792
 793            pane.update(&mut cx, |_, cx| cx.notify())?;
 794            Ok(())
 795        })
 796    }
 797
 798    pub fn remove_item(
 799        &mut self,
 800        item_index: usize,
 801        activate_pane: bool,
 802        cx: &mut ViewContext<Self>,
 803    ) {
 804        self.activation_history
 805            .retain(|&history_entry| history_entry != self.items[item_index].id());
 806
 807        if item_index == self.active_item_index {
 808            let index_to_activate = self
 809                .activation_history
 810                .pop()
 811                .and_then(|last_activated_item| {
 812                    self.items.iter().enumerate().find_map(|(index, item)| {
 813                        (item.id() == last_activated_item).then_some(index)
 814                    })
 815                })
 816                // We didn't have a valid activation history entry, so fallback
 817                // to activating the item to the left
 818                .unwrap_or_else(|| item_index.min(self.items.len()).saturating_sub(1));
 819
 820            let should_activate = activate_pane || self.has_focus;
 821            self.activate_item(index_to_activate, should_activate, should_activate, cx);
 822        }
 823
 824        let item = self.items.remove(item_index);
 825
 826        cx.emit(Event::RemoveItem { item_id: item.id() });
 827        if self.items.is_empty() {
 828            item.deactivated(cx);
 829            self.update_toolbar(cx);
 830            cx.emit(Event::Remove);
 831        }
 832
 833        if item_index < self.active_item_index {
 834            self.active_item_index -= 1;
 835        }
 836
 837        self.nav_history.set_mode(NavigationMode::ClosingItem);
 838        item.deactivated(cx);
 839        self.nav_history.set_mode(NavigationMode::Normal);
 840
 841        if let Some(path) = item.project_path(cx) {
 842            let abs_path = self
 843                .nav_history
 844                .0
 845                .borrow()
 846                .paths_by_item
 847                .get(&item.id())
 848                .and_then(|(_, abs_path)| abs_path.clone());
 849            self.nav_history
 850                .0
 851                .borrow_mut()
 852                .paths_by_item
 853                .insert(item.id(), (path, abs_path));
 854        } else {
 855            self.nav_history
 856                .0
 857                .borrow_mut()
 858                .paths_by_item
 859                .remove(&item.id());
 860        }
 861
 862        if self.items.is_empty() && self.zoomed {
 863            cx.emit(Event::ZoomOut);
 864        }
 865
 866        cx.notify();
 867    }
 868
 869    pub async fn save_item(
 870        project: ModelHandle<Project>,
 871        pane: &WeakViewHandle<Pane>,
 872        item_ix: usize,
 873        item: &dyn ItemHandle,
 874        should_prompt_for_save: bool,
 875        cx: &mut AsyncAppContext,
 876    ) -> Result<bool> {
 877        const CONFLICT_MESSAGE: &str =
 878            "This file has changed on disk since you started editing it. Do you want to overwrite it?";
 879        const DIRTY_MESSAGE: &str = "This file contains unsaved edits. Do you want to save it?";
 880
 881        let (has_conflict, is_dirty, can_save, is_singleton) = cx.read(|cx| {
 882            (
 883                item.has_conflict(cx),
 884                item.is_dirty(cx),
 885                item.can_save(cx),
 886                item.is_singleton(cx),
 887            )
 888        });
 889
 890        if has_conflict && can_save {
 891            let mut answer = pane.update(cx, |pane, cx| {
 892                pane.activate_item(item_ix, true, true, cx);
 893                cx.prompt(
 894                    PromptLevel::Warning,
 895                    CONFLICT_MESSAGE,
 896                    &["Overwrite", "Discard", "Cancel"],
 897                )
 898            })?;
 899            match answer.next().await {
 900                Some(0) => pane.update(cx, |_, cx| item.save(project, cx))?.await?,
 901                Some(1) => pane.update(cx, |_, cx| item.reload(project, cx))?.await?,
 902                _ => return Ok(false),
 903            }
 904        } else if is_dirty && (can_save || is_singleton) {
 905            let will_autosave = cx.read(|cx| {
 906                matches!(
 907                    settings::get::<WorkspaceSettings>(cx).autosave,
 908                    AutosaveSetting::OnFocusChange | AutosaveSetting::OnWindowChange
 909                ) && Self::can_autosave_item(&*item, cx)
 910            });
 911            let should_save = if should_prompt_for_save && !will_autosave {
 912                let mut answer = pane.update(cx, |pane, cx| {
 913                    pane.activate_item(item_ix, true, true, cx);
 914                    cx.prompt(
 915                        PromptLevel::Warning,
 916                        DIRTY_MESSAGE,
 917                        &["Save", "Don't Save", "Cancel"],
 918                    )
 919                })?;
 920                match answer.next().await {
 921                    Some(0) => true,
 922                    Some(1) => false,
 923                    _ => return Ok(false),
 924                }
 925            } else {
 926                true
 927            };
 928
 929            if should_save {
 930                if can_save {
 931                    pane.update(cx, |_, cx| item.save(project, cx))?.await?;
 932                } else if is_singleton {
 933                    let start_abs_path = project
 934                        .read_with(cx, |project, cx| {
 935                            let worktree = project.visible_worktrees(cx).next()?;
 936                            Some(worktree.read(cx).as_local()?.abs_path().to_path_buf())
 937                        })
 938                        .unwrap_or_else(|| Path::new("").into());
 939
 940                    let mut abs_path = cx.update(|cx| cx.prompt_for_new_path(&start_abs_path));
 941                    if let Some(abs_path) = abs_path.next().await.flatten() {
 942                        pane.update(cx, |_, cx| item.save_as(project, abs_path, cx))?
 943                            .await?;
 944                    } else {
 945                        return Ok(false);
 946                    }
 947                }
 948            }
 949        }
 950        Ok(true)
 951    }
 952
 953    fn can_autosave_item(item: &dyn ItemHandle, cx: &AppContext) -> bool {
 954        let is_deleted = item.project_entry_ids(cx).is_empty();
 955        item.is_dirty(cx) && !item.has_conflict(cx) && item.can_save(cx) && !is_deleted
 956    }
 957
 958    pub fn autosave_item(
 959        item: &dyn ItemHandle,
 960        project: ModelHandle<Project>,
 961        cx: &mut WindowContext,
 962    ) -> Task<Result<()>> {
 963        if Self::can_autosave_item(item, cx) {
 964            item.save(project, cx)
 965        } else {
 966            Task::ready(Ok(()))
 967        }
 968    }
 969
 970    pub fn focus_active_item(&mut self, cx: &mut ViewContext<Self>) {
 971        if let Some(active_item) = self.active_item() {
 972            cx.focus(active_item.as_any());
 973        }
 974    }
 975
 976    pub fn split(&mut self, direction: SplitDirection, cx: &mut ViewContext<Self>) {
 977        cx.emit(Event::Split(direction));
 978    }
 979
 980    fn deploy_split_menu(&mut self, cx: &mut ViewContext<Self>) {
 981        self.tab_bar_context_menu.handle.update(cx, |menu, cx| {
 982            menu.show(
 983                Default::default(),
 984                AnchorCorner::TopRight,
 985                vec![
 986                    ContextMenuItem::action("Split Right", SplitRight),
 987                    ContextMenuItem::action("Split Left", SplitLeft),
 988                    ContextMenuItem::action("Split Up", SplitUp),
 989                    ContextMenuItem::action("Split Down", SplitDown),
 990                ],
 991                cx,
 992            );
 993        });
 994
 995        self.tab_bar_context_menu.kind = TabBarContextMenuKind::Split;
 996    }
 997
 998    fn deploy_new_menu(&mut self, cx: &mut ViewContext<Self>) {
 999        self.tab_bar_context_menu.handle.update(cx, |menu, cx| {
1000            menu.show(
1001                Default::default(),
1002                AnchorCorner::TopRight,
1003                vec![
1004                    ContextMenuItem::action("New File", NewFile),
1005                    ContextMenuItem::action("New Terminal", NewCenterTerminal),
1006                    ContextMenuItem::action("New Search", NewSearch),
1007                ],
1008                cx,
1009            );
1010        });
1011
1012        self.tab_bar_context_menu.kind = TabBarContextMenuKind::New;
1013    }
1014
1015    fn deploy_tab_context_menu(
1016        &mut self,
1017        position: Vector2F,
1018        target_item_id: usize,
1019        cx: &mut ViewContext<Self>,
1020    ) {
1021        let active_item_id = self.items[self.active_item_index].id();
1022        let is_active_item = target_item_id == active_item_id;
1023        let target_pane = cx.weak_handle();
1024
1025        // The `CloseInactiveItems` action should really be called "CloseOthers" and the behaviour should be dynamically based on the tab the action is ran on.  Currently, this is a weird action because you can run it on a non-active tab and it will close everything by the actual active tab
1026
1027        self.tab_context_menu.update(cx, |menu, cx| {
1028            menu.show(
1029                position,
1030                AnchorCorner::TopLeft,
1031                if is_active_item {
1032                    vec![
1033                        ContextMenuItem::action("Close Active Item", CloseActiveItem),
1034                        ContextMenuItem::action("Close Inactive Items", CloseInactiveItems),
1035                        ContextMenuItem::action("Close Clean Items", CloseCleanItems),
1036                        ContextMenuItem::action("Close Items To The Left", CloseItemsToTheLeft),
1037                        ContextMenuItem::action("Close Items To The Right", CloseItemsToTheRight),
1038                        ContextMenuItem::action("Close All Items", CloseAllItems),
1039                    ]
1040                } else {
1041                    // In the case of the user right clicking on a non-active tab, for some item-closing commands, we need to provide the id of the tab, for the others, we can reuse the existing command.
1042                    vec![
1043                        ContextMenuItem::handler("Close Inactive Item", {
1044                            let pane = target_pane.clone();
1045                            move |cx| {
1046                                if let Some(pane) = pane.upgrade(cx) {
1047                                    pane.update(cx, |pane, cx| {
1048                                        pane.close_item_by_id(target_item_id, cx)
1049                                            .detach_and_log_err(cx);
1050                                    })
1051                                }
1052                            }
1053                        }),
1054                        ContextMenuItem::action("Close Inactive Items", CloseInactiveItems),
1055                        ContextMenuItem::action("Close Clean Items", CloseCleanItems),
1056                        ContextMenuItem::handler("Close Items To The Left", {
1057                            let pane = target_pane.clone();
1058                            move |cx| {
1059                                if let Some(pane) = pane.upgrade(cx) {
1060                                    pane.update(cx, |pane, cx| {
1061                                        pane.close_items_to_the_left_by_id(target_item_id, cx)
1062                                            .detach_and_log_err(cx);
1063                                    })
1064                                }
1065                            }
1066                        }),
1067                        ContextMenuItem::handler("Close Items To The Right", {
1068                            let pane = target_pane.clone();
1069                            move |cx| {
1070                                if let Some(pane) = pane.upgrade(cx) {
1071                                    pane.update(cx, |pane, cx| {
1072                                        pane.close_items_to_the_right_by_id(target_item_id, cx)
1073                                            .detach_and_log_err(cx);
1074                                    })
1075                                }
1076                            }
1077                        }),
1078                        ContextMenuItem::action("Close All Items", CloseAllItems),
1079                    ]
1080                },
1081                cx,
1082            );
1083        });
1084    }
1085
1086    pub fn toolbar(&self) -> &ViewHandle<Toolbar> {
1087        &self.toolbar
1088    }
1089
1090    pub fn handle_deleted_project_item(
1091        &mut self,
1092        entry_id: ProjectEntryId,
1093        cx: &mut ViewContext<Pane>,
1094    ) -> Option<()> {
1095        let (item_index_to_delete, item_id) = self.items().enumerate().find_map(|(i, item)| {
1096            if item.is_singleton(cx) && item.project_entry_ids(cx).as_slice() == [entry_id] {
1097                Some((i, item.id()))
1098            } else {
1099                None
1100            }
1101        })?;
1102
1103        self.remove_item(item_index_to_delete, false, cx);
1104        self.nav_history.remove_item(item_id);
1105
1106        Some(())
1107    }
1108
1109    fn update_toolbar(&mut self, cx: &mut ViewContext<Self>) {
1110        let active_item = self
1111            .items
1112            .get(self.active_item_index)
1113            .map(|item| item.as_ref());
1114        self.toolbar.update(cx, |toolbar, cx| {
1115            toolbar.set_active_pane_item(active_item, cx);
1116        });
1117    }
1118
1119    fn render_tabs(&mut self, cx: &mut ViewContext<Self>) -> impl Element<Self> {
1120        let theme = theme::current(cx).clone();
1121
1122        let pane = cx.handle().downgrade();
1123        let autoscroll = if mem::take(&mut self.autoscroll) {
1124            Some(self.active_item_index)
1125        } else {
1126            None
1127        };
1128
1129        let pane_active = self.has_focus;
1130
1131        enum Tabs {}
1132        let mut row = Flex::row().scrollable::<Tabs>(1, autoscroll, cx);
1133        for (ix, (item, detail)) in self
1134            .items
1135            .iter()
1136            .cloned()
1137            .zip(self.tab_details(cx))
1138            .enumerate()
1139        {
1140            let detail = if detail == 0 { None } else { Some(detail) };
1141            let tab_active = ix == self.active_item_index;
1142
1143            row.add_child({
1144                enum TabDragReceiver {}
1145                let mut receiver =
1146                    dragged_item_receiver::<TabDragReceiver, _, _>(self, ix, ix, true, None, cx, {
1147                        let item = item.clone();
1148                        let pane = pane.clone();
1149                        let detail = detail.clone();
1150
1151                        let theme = theme::current(cx).clone();
1152                        let mut tooltip_theme = theme.tooltip.clone();
1153                        tooltip_theme.max_text_width = None;
1154                        let tab_tooltip_text =
1155                            item.tab_tooltip_text(cx).map(|text| text.into_owned());
1156
1157                        move |mouse_state, cx| {
1158                            let tab_style =
1159                                theme.workspace.tab_bar.tab_style(pane_active, tab_active);
1160                            let hovered = mouse_state.hovered();
1161
1162                            enum Tab {}
1163                            let mouse_event_handler =
1164                                MouseEventHandler::<Tab, Pane>::new(ix, cx, |_, cx| {
1165                                    Self::render_tab(
1166                                        &item,
1167                                        pane.clone(),
1168                                        ix == 0,
1169                                        detail,
1170                                        hovered,
1171                                        tab_style,
1172                                        cx,
1173                                    )
1174                                })
1175                                .on_down(MouseButton::Left, move |_, this, cx| {
1176                                    this.activate_item(ix, true, true, cx);
1177                                })
1178                                .on_click(MouseButton::Middle, {
1179                                    let item_id = item.id();
1180                                    move |_, pane, cx| {
1181                                        pane.close_item_by_id(item_id, cx).detach_and_log_err(cx);
1182                                    }
1183                                })
1184                                .on_down(
1185                                    MouseButton::Right,
1186                                    move |event, pane, cx| {
1187                                        pane.deploy_tab_context_menu(event.position, item.id(), cx);
1188                                    },
1189                                );
1190
1191                            if let Some(tab_tooltip_text) = tab_tooltip_text {
1192                                mouse_event_handler
1193                                    .with_tooltip::<Self>(
1194                                        ix,
1195                                        tab_tooltip_text,
1196                                        None,
1197                                        tooltip_theme,
1198                                        cx,
1199                                    )
1200                                    .into_any()
1201                            } else {
1202                                mouse_event_handler.into_any()
1203                            }
1204                        }
1205                    });
1206
1207                if !pane_active || !tab_active {
1208                    receiver = receiver.with_cursor_style(CursorStyle::PointingHand);
1209                }
1210
1211                receiver.as_draggable(
1212                    DraggedItem {
1213                        handle: item,
1214                        pane: pane.clone(),
1215                    },
1216                    {
1217                        let theme = theme::current(cx).clone();
1218
1219                        let detail = detail.clone();
1220                        move |dragged_item: &DraggedItem, cx: &mut ViewContext<Workspace>| {
1221                            let tab_style = &theme.workspace.tab_bar.dragged_tab;
1222                            Self::render_dragged_tab(
1223                                &dragged_item.handle,
1224                                dragged_item.pane.clone(),
1225                                false,
1226                                detail,
1227                                false,
1228                                &tab_style,
1229                                cx,
1230                            )
1231                        }
1232                    },
1233                )
1234            })
1235        }
1236
1237        // Use the inactive tab style along with the current pane's active status to decide how to render
1238        // the filler
1239        let filler_index = self.items.len();
1240        let filler_style = theme.workspace.tab_bar.tab_style(pane_active, false);
1241        enum Filler {}
1242        row.add_child(
1243            dragged_item_receiver::<Filler, _, _>(self, 0, filler_index, true, None, cx, |_, _| {
1244                Empty::new()
1245                    .contained()
1246                    .with_style(filler_style.container)
1247                    .with_border(filler_style.container.border)
1248            })
1249            .flex(1., true)
1250            .into_any_named("filler"),
1251        );
1252
1253        row
1254    }
1255
1256    fn tab_details(&self, cx: &AppContext) -> Vec<usize> {
1257        let mut tab_details = (0..self.items.len()).map(|_| 0).collect::<Vec<_>>();
1258
1259        let mut tab_descriptions = HashMap::default();
1260        let mut done = false;
1261        while !done {
1262            done = true;
1263
1264            // Store item indices by their tab description.
1265            for (ix, (item, detail)) in self.items.iter().zip(&tab_details).enumerate() {
1266                if let Some(description) = item.tab_description(*detail, cx) {
1267                    if *detail == 0
1268                        || Some(&description) != item.tab_description(detail - 1, cx).as_ref()
1269                    {
1270                        tab_descriptions
1271                            .entry(description)
1272                            .or_insert(Vec::new())
1273                            .push(ix);
1274                    }
1275                }
1276            }
1277
1278            // If two or more items have the same tab description, increase their level
1279            // of detail and try again.
1280            for (_, item_ixs) in tab_descriptions.drain() {
1281                if item_ixs.len() > 1 {
1282                    done = false;
1283                    for ix in item_ixs {
1284                        tab_details[ix] += 1;
1285                    }
1286                }
1287            }
1288        }
1289
1290        tab_details
1291    }
1292
1293    fn render_tab(
1294        item: &Box<dyn ItemHandle>,
1295        pane: WeakViewHandle<Pane>,
1296        first: bool,
1297        detail: Option<usize>,
1298        hovered: bool,
1299        tab_style: &theme::Tab,
1300        cx: &mut ViewContext<Self>,
1301    ) -> AnyElement<Self> {
1302        let title = item.tab_content(detail, &tab_style, cx);
1303        Self::render_tab_with_title(title, item, pane, first, hovered, tab_style, cx)
1304    }
1305
1306    fn render_dragged_tab(
1307        item: &Box<dyn ItemHandle>,
1308        pane: WeakViewHandle<Pane>,
1309        first: bool,
1310        detail: Option<usize>,
1311        hovered: bool,
1312        tab_style: &theme::Tab,
1313        cx: &mut ViewContext<Workspace>,
1314    ) -> AnyElement<Workspace> {
1315        let title = item.dragged_tab_content(detail, &tab_style, cx);
1316        Self::render_tab_with_title(title, item, pane, first, hovered, tab_style, cx)
1317    }
1318
1319    fn render_tab_with_title<T: View>(
1320        title: AnyElement<T>,
1321        item: &Box<dyn ItemHandle>,
1322        pane: WeakViewHandle<Pane>,
1323        first: bool,
1324        hovered: bool,
1325        tab_style: &theme::Tab,
1326        cx: &mut ViewContext<T>,
1327    ) -> AnyElement<T> {
1328        let mut container = tab_style.container.clone();
1329        if first {
1330            container.border.left = false;
1331        }
1332
1333        Flex::row()
1334            .with_child({
1335                let diameter = 7.0;
1336                let icon_color = if item.has_conflict(cx) {
1337                    Some(tab_style.icon_conflict)
1338                } else if item.is_dirty(cx) {
1339                    Some(tab_style.icon_dirty)
1340                } else {
1341                    None
1342                };
1343
1344                Canvas::new(move |scene, bounds, _, _, _| {
1345                    if let Some(color) = icon_color {
1346                        let square = RectF::new(bounds.origin(), vec2f(diameter, diameter));
1347                        scene.push_quad(Quad {
1348                            bounds: square,
1349                            background: Some(color),
1350                            border: Default::default(),
1351                            corner_radius: diameter / 2.,
1352                        });
1353                    }
1354                })
1355                .constrained()
1356                .with_width(diameter)
1357                .with_height(diameter)
1358                .aligned()
1359            })
1360            .with_child(title.aligned().contained().with_style(ContainerStyle {
1361                margin: Margin {
1362                    left: tab_style.spacing,
1363                    right: tab_style.spacing,
1364                    ..Default::default()
1365                },
1366                ..Default::default()
1367            }))
1368            .with_child(
1369                if hovered {
1370                    let item_id = item.id();
1371                    enum TabCloseButton {}
1372                    let icon = Svg::new("icons/x_mark_8.svg");
1373                    MouseEventHandler::<TabCloseButton, _>::new(item_id, cx, |mouse_state, _| {
1374                        if mouse_state.hovered() {
1375                            icon.with_color(tab_style.icon_close_active)
1376                        } else {
1377                            icon.with_color(tab_style.icon_close)
1378                        }
1379                    })
1380                    .with_padding(Padding::uniform(4.))
1381                    .with_cursor_style(CursorStyle::PointingHand)
1382                    .on_click(MouseButton::Left, {
1383                        let pane = pane.clone();
1384                        move |_, _, cx| {
1385                            let pane = pane.clone();
1386                            cx.window_context().defer(move |cx| {
1387                                if let Some(pane) = pane.upgrade(cx) {
1388                                    pane.update(cx, |pane, cx| {
1389                                        pane.close_item_by_id(item_id, cx).detach_and_log_err(cx);
1390                                    });
1391                                }
1392                            });
1393                        }
1394                    })
1395                    .into_any_named("close-tab-icon")
1396                    .constrained()
1397                } else {
1398                    Empty::new().constrained()
1399                }
1400                .with_width(tab_style.close_icon_width)
1401                .aligned(),
1402            )
1403            .contained()
1404            .with_style(container)
1405            .constrained()
1406            .with_height(tab_style.height)
1407            .into_any()
1408    }
1409
1410    pub fn render_tab_bar_button<F: 'static + Fn(&mut Pane, &mut EventContext<Pane>)>(
1411        index: usize,
1412        icon: &'static str,
1413        active: bool,
1414        tooltip: Option<(String, Option<Box<dyn Action>>)>,
1415        cx: &mut ViewContext<Pane>,
1416        on_click: F,
1417        context_menu: Option<ViewHandle<ContextMenu>>,
1418    ) -> AnyElement<Pane> {
1419        enum TabBarButton {}
1420
1421        let mut button = MouseEventHandler::<TabBarButton, _>::new(index, cx, |mouse_state, cx| {
1422            let theme = &settings::get::<ThemeSettings>(cx).theme.workspace.tab_bar;
1423            let style = theme.pane_button.style_for(mouse_state, active);
1424            Svg::new(icon)
1425                .with_color(style.color)
1426                .constrained()
1427                .with_width(style.icon_width)
1428                .aligned()
1429                .constrained()
1430                .with_width(style.button_width)
1431                .with_height(style.button_width)
1432        })
1433        .with_cursor_style(CursorStyle::PointingHand)
1434        .on_click(MouseButton::Left, move |_, pane, cx| on_click(pane, cx))
1435        .into_any();
1436        if let Some((tooltip, action)) = tooltip {
1437            let tooltip_style = settings::get::<ThemeSettings>(cx).theme.tooltip.clone();
1438            button = button
1439                .with_tooltip::<TabBarButton>(index, tooltip, action, tooltip_style, cx)
1440                .into_any();
1441        }
1442
1443        Stack::new()
1444            .with_child(button)
1445            .with_children(
1446                context_menu.map(|menu| ChildView::new(&menu, cx).aligned().bottom().right()),
1447            )
1448            .flex(1., false)
1449            .into_any_named("tab bar button")
1450    }
1451
1452    fn render_blank_pane(&self, theme: &Theme, _cx: &mut ViewContext<Self>) -> AnyElement<Self> {
1453        let background = theme.workspace.background;
1454        Empty::new()
1455            .contained()
1456            .with_background_color(background)
1457            .into_any()
1458    }
1459
1460    pub fn set_zoomed(&mut self, zoomed: bool, cx: &mut ViewContext<Self>) {
1461        self.zoomed = zoomed;
1462        cx.notify();
1463    }
1464
1465    pub fn is_zoomed(&self) -> bool {
1466        self.zoomed
1467    }
1468}
1469
1470impl Entity for Pane {
1471    type Event = Event;
1472}
1473
1474impl View for Pane {
1475    fn ui_name() -> &'static str {
1476        "Pane"
1477    }
1478
1479    fn render(&mut self, cx: &mut ViewContext<Self>) -> AnyElement<Self> {
1480        enum MouseNavigationHandler {}
1481
1482        MouseEventHandler::<MouseNavigationHandler, _>::new(0, cx, |_, cx| {
1483            let active_item_index = self.active_item_index;
1484
1485            if let Some(active_item) = self.active_item() {
1486                Flex::column()
1487                    .with_child({
1488                        let theme = theme::current(cx).clone();
1489
1490                        let mut stack = Stack::new();
1491
1492                        enum TabBarEventHandler {}
1493                        stack.add_child(
1494                            MouseEventHandler::<TabBarEventHandler, _>::new(0, cx, |_, _| {
1495                                Empty::new()
1496                                    .contained()
1497                                    .with_style(theme.workspace.tab_bar.container)
1498                            })
1499                            .on_down(
1500                                MouseButton::Left,
1501                                move |_, this, cx| {
1502                                    this.activate_item(active_item_index, true, true, cx);
1503                                },
1504                            ),
1505                        );
1506
1507                        let mut tab_row = Flex::row()
1508                            .with_child(self.render_tabs(cx).flex(1., true).into_any_named("tabs"));
1509
1510                        if self.has_focus {
1511                            let render_tab_bar_buttons = self.render_tab_bar_buttons.clone();
1512                            tab_row.add_child(
1513                                (render_tab_bar_buttons)(self, cx)
1514                                    .contained()
1515                                    .with_style(theme.workspace.tab_bar.pane_button_container)
1516                                    .flex(1., false)
1517                                    .into_any(),
1518                            )
1519                        }
1520
1521                        stack.add_child(tab_row);
1522                        stack
1523                            .constrained()
1524                            .with_height(theme.workspace.tab_bar.height)
1525                            .flex(1., false)
1526                            .into_any_named("tab bar")
1527                    })
1528                    .with_child({
1529                        enum PaneContentTabDropTarget {}
1530                        dragged_item_receiver::<PaneContentTabDropTarget, _, _>(
1531                            self,
1532                            0,
1533                            self.active_item_index + 1,
1534                            !self.can_split,
1535                            if self.can_split { Some(100.) } else { None },
1536                            cx,
1537                            {
1538                                let toolbar = self.toolbar.clone();
1539                                let toolbar_hidden = toolbar.read(cx).hidden();
1540                                move |_, cx| {
1541                                    Flex::column()
1542                                        .with_children(
1543                                            (!toolbar_hidden)
1544                                                .then(|| ChildView::new(&toolbar, cx).expanded()),
1545                                        )
1546                                        .with_child(
1547                                            ChildView::new(active_item.as_any(), cx).flex(1., true),
1548                                        )
1549                                }
1550                            },
1551                        )
1552                        .flex(1., true)
1553                    })
1554                    .with_child(ChildView::new(&self.tab_context_menu, cx))
1555                    .into_any()
1556            } else {
1557                enum EmptyPane {}
1558                let theme = theme::current(cx).clone();
1559
1560                dragged_item_receiver::<EmptyPane, _, _>(self, 0, 0, false, None, cx, |_, cx| {
1561                    self.render_blank_pane(&theme, cx)
1562                })
1563                .on_down(MouseButton::Left, |_, _, cx| {
1564                    cx.focus_parent();
1565                })
1566                .into_any()
1567            }
1568        })
1569        .on_down(
1570            MouseButton::Navigate(NavigationDirection::Back),
1571            move |_, pane, cx| {
1572                if let Some(workspace) = pane.workspace.upgrade(cx) {
1573                    let pane = cx.weak_handle();
1574                    cx.window_context().defer(move |cx| {
1575                        workspace.update(cx, |workspace, cx| {
1576                            workspace.go_back(pane, cx).detach_and_log_err(cx)
1577                        })
1578                    })
1579                }
1580            },
1581        )
1582        .on_down(MouseButton::Navigate(NavigationDirection::Forward), {
1583            move |_, pane, cx| {
1584                if let Some(workspace) = pane.workspace.upgrade(cx) {
1585                    let pane = cx.weak_handle();
1586                    cx.window_context().defer(move |cx| {
1587                        workspace.update(cx, |workspace, cx| {
1588                            workspace.go_forward(pane, cx).detach_and_log_err(cx)
1589                        })
1590                    })
1591                }
1592            }
1593        })
1594        .into_any_named("pane")
1595    }
1596
1597    fn focus_in(&mut self, focused: AnyViewHandle, cx: &mut ViewContext<Self>) {
1598        if !self.has_focus {
1599            self.has_focus = true;
1600            cx.emit(Event::Focus);
1601            cx.notify();
1602        }
1603
1604        self.toolbar.update(cx, |toolbar, cx| {
1605            toolbar.pane_focus_update(true, cx);
1606        });
1607
1608        if let Some(active_item) = self.active_item() {
1609            if cx.is_self_focused() {
1610                // Pane was focused directly. We need to either focus a view inside the active item,
1611                // or focus the active item itself
1612                if let Some(weak_last_focused_view) =
1613                    self.last_focused_view_by_item.get(&active_item.id())
1614                {
1615                    if let Some(last_focused_view) = weak_last_focused_view.upgrade(cx) {
1616                        cx.focus(&last_focused_view);
1617                        return;
1618                    } else {
1619                        self.last_focused_view_by_item.remove(&active_item.id());
1620                    }
1621                }
1622
1623                cx.focus(active_item.as_any());
1624            } else if focused != self.tab_bar_context_menu.handle {
1625                self.last_focused_view_by_item
1626                    .insert(active_item.id(), focused.downgrade());
1627            }
1628        }
1629    }
1630
1631    fn focus_out(&mut self, _: AnyViewHandle, cx: &mut ViewContext<Self>) {
1632        self.has_focus = false;
1633        self.toolbar.update(cx, |toolbar, cx| {
1634            toolbar.pane_focus_update(false, cx);
1635        });
1636        cx.notify();
1637    }
1638
1639    fn update_keymap_context(&self, keymap: &mut KeymapContext, _: &AppContext) {
1640        Self::reset_to_default_keymap_context(keymap);
1641    }
1642}
1643
1644impl ItemNavHistory {
1645    pub fn push<D: 'static + Any>(&mut self, data: Option<D>, cx: &mut WindowContext) {
1646        self.history.push(data, self.item.clone(), cx);
1647    }
1648
1649    pub fn pop_backward(&mut self, cx: &mut WindowContext) -> Option<NavigationEntry> {
1650        self.history.pop(NavigationMode::GoingBack, cx)
1651    }
1652
1653    pub fn pop_forward(&mut self, cx: &mut WindowContext) -> Option<NavigationEntry> {
1654        self.history.pop(NavigationMode::GoingForward, cx)
1655    }
1656}
1657
1658impl NavHistory {
1659    pub fn for_each_entry(
1660        &self,
1661        cx: &AppContext,
1662        mut f: impl FnMut(&NavigationEntry, (ProjectPath, Option<PathBuf>)),
1663    ) {
1664        let borrowed_history = self.0.borrow();
1665        borrowed_history
1666            .forward_stack
1667            .iter()
1668            .chain(borrowed_history.backward_stack.iter())
1669            .chain(borrowed_history.closed_stack.iter())
1670            .for_each(|entry| {
1671                if let Some(project_and_abs_path) =
1672                    borrowed_history.paths_by_item.get(&entry.item.id())
1673                {
1674                    f(entry, project_and_abs_path.clone());
1675                } else if let Some(item) = entry.item.upgrade(cx) {
1676                    if let Some(path) = item.project_path(cx) {
1677                        f(entry, (path, None));
1678                    }
1679                }
1680            })
1681    }
1682
1683    pub fn set_mode(&mut self, mode: NavigationMode) {
1684        self.0.borrow_mut().mode = mode;
1685    }
1686
1687    pub fn mode(&self) -> NavigationMode {
1688        self.0.borrow().mode
1689    }
1690
1691    pub fn disable(&mut self) {
1692        self.0.borrow_mut().mode = NavigationMode::Disabled;
1693    }
1694
1695    pub fn enable(&mut self) {
1696        self.0.borrow_mut().mode = NavigationMode::Normal;
1697    }
1698
1699    pub fn pop(&mut self, mode: NavigationMode, cx: &mut WindowContext) -> Option<NavigationEntry> {
1700        let mut state = self.0.borrow_mut();
1701        let entry = match mode {
1702            NavigationMode::Normal | NavigationMode::Disabled | NavigationMode::ClosingItem => {
1703                return None
1704            }
1705            NavigationMode::GoingBack => &mut state.backward_stack,
1706            NavigationMode::GoingForward => &mut state.forward_stack,
1707            NavigationMode::ReopeningClosedItem => &mut state.closed_stack,
1708        }
1709        .pop_back();
1710        if entry.is_some() {
1711            state.did_update(cx);
1712        }
1713        entry
1714    }
1715
1716    pub fn push<D: 'static + Any>(
1717        &mut self,
1718        data: Option<D>,
1719        item: Rc<dyn WeakItemHandle>,
1720        cx: &mut WindowContext,
1721    ) {
1722        let state = &mut *self.0.borrow_mut();
1723        match state.mode {
1724            NavigationMode::Disabled => {}
1725            NavigationMode::Normal | NavigationMode::ReopeningClosedItem => {
1726                if state.backward_stack.len() >= MAX_NAVIGATION_HISTORY_LEN {
1727                    state.backward_stack.pop_front();
1728                }
1729                state.backward_stack.push_back(NavigationEntry {
1730                    item,
1731                    data: data.map(|data| Box::new(data) as Box<dyn Any>),
1732                    timestamp: state.next_timestamp.fetch_add(1, Ordering::SeqCst),
1733                });
1734                state.forward_stack.clear();
1735            }
1736            NavigationMode::GoingBack => {
1737                if state.forward_stack.len() >= MAX_NAVIGATION_HISTORY_LEN {
1738                    state.forward_stack.pop_front();
1739                }
1740                state.forward_stack.push_back(NavigationEntry {
1741                    item,
1742                    data: data.map(|data| Box::new(data) as Box<dyn Any>),
1743                    timestamp: state.next_timestamp.fetch_add(1, Ordering::SeqCst),
1744                });
1745            }
1746            NavigationMode::GoingForward => {
1747                if state.backward_stack.len() >= MAX_NAVIGATION_HISTORY_LEN {
1748                    state.backward_stack.pop_front();
1749                }
1750                state.backward_stack.push_back(NavigationEntry {
1751                    item,
1752                    data: data.map(|data| Box::new(data) as Box<dyn Any>),
1753                    timestamp: state.next_timestamp.fetch_add(1, Ordering::SeqCst),
1754                });
1755            }
1756            NavigationMode::ClosingItem => {
1757                if state.closed_stack.len() >= MAX_NAVIGATION_HISTORY_LEN {
1758                    state.closed_stack.pop_front();
1759                }
1760                state.closed_stack.push_back(NavigationEntry {
1761                    item,
1762                    data: data.map(|data| Box::new(data) as Box<dyn Any>),
1763                    timestamp: state.next_timestamp.fetch_add(1, Ordering::SeqCst),
1764                });
1765            }
1766        }
1767        state.did_update(cx);
1768    }
1769
1770    pub fn remove_item(&mut self, item_id: usize) {
1771        let mut state = self.0.borrow_mut();
1772        state.paths_by_item.remove(&item_id);
1773        state
1774            .backward_stack
1775            .retain(|entry| entry.item.id() != item_id);
1776        state
1777            .forward_stack
1778            .retain(|entry| entry.item.id() != item_id);
1779        state
1780            .closed_stack
1781            .retain(|entry| entry.item.id() != item_id);
1782    }
1783
1784    pub fn path_for_item(&self, item_id: usize) -> Option<(ProjectPath, Option<PathBuf>)> {
1785        self.0.borrow().paths_by_item.get(&item_id).cloned()
1786    }
1787}
1788
1789impl NavHistoryState {
1790    pub fn did_update(&self, cx: &mut WindowContext) {
1791        if let Some(pane) = self.pane.upgrade(cx) {
1792            cx.defer(move |cx| {
1793                pane.update(cx, |pane, cx| pane.history_updated(cx));
1794            });
1795        }
1796    }
1797}
1798
1799pub struct PaneBackdrop<V: View> {
1800    child_view: usize,
1801    child: AnyElement<V>,
1802}
1803
1804impl<V: View> PaneBackdrop<V> {
1805    pub fn new(pane_item_view: usize, child: AnyElement<V>) -> Self {
1806        PaneBackdrop {
1807            child,
1808            child_view: pane_item_view,
1809        }
1810    }
1811}
1812
1813impl<V: View> Element<V> for PaneBackdrop<V> {
1814    type LayoutState = ();
1815
1816    type PaintState = ();
1817
1818    fn layout(
1819        &mut self,
1820        constraint: gpui::SizeConstraint,
1821        view: &mut V,
1822        cx: &mut LayoutContext<V>,
1823    ) -> (Vector2F, Self::LayoutState) {
1824        let size = self.child.layout(constraint, view, cx);
1825        (size, ())
1826    }
1827
1828    fn paint(
1829        &mut self,
1830        scene: &mut gpui::SceneBuilder,
1831        bounds: RectF,
1832        visible_bounds: RectF,
1833        _: &mut Self::LayoutState,
1834        view: &mut V,
1835        cx: &mut ViewContext<V>,
1836    ) -> Self::PaintState {
1837        let background = theme::current(cx).editor.background;
1838
1839        let visible_bounds = bounds.intersection(visible_bounds).unwrap_or_default();
1840
1841        scene.push_quad(gpui::Quad {
1842            bounds: RectF::new(bounds.origin(), bounds.size()),
1843            background: Some(background),
1844            ..Default::default()
1845        });
1846
1847        let child_view_id = self.child_view;
1848        scene.push_mouse_region(
1849            MouseRegion::new::<Self>(child_view_id, 0, visible_bounds).on_down(
1850                gpui::platform::MouseButton::Left,
1851                move |_, _: &mut V, cx| {
1852                    let window_id = cx.window_id();
1853                    cx.app_context().focus(window_id, Some(child_view_id))
1854                },
1855            ),
1856        );
1857
1858        scene.paint_layer(Some(bounds), |scene| {
1859            self.child
1860                .paint(scene, bounds.origin(), visible_bounds, view, cx)
1861        })
1862    }
1863
1864    fn rect_for_text_range(
1865        &self,
1866        range_utf16: std::ops::Range<usize>,
1867        _bounds: RectF,
1868        _visible_bounds: RectF,
1869        _layout: &Self::LayoutState,
1870        _paint: &Self::PaintState,
1871        view: &V,
1872        cx: &gpui::ViewContext<V>,
1873    ) -> Option<RectF> {
1874        self.child.rect_for_text_range(range_utf16, view, cx)
1875    }
1876
1877    fn debug(
1878        &self,
1879        _bounds: RectF,
1880        _layout: &Self::LayoutState,
1881        _paint: &Self::PaintState,
1882        view: &V,
1883        cx: &gpui::ViewContext<V>,
1884    ) -> serde_json::Value {
1885        gpui::json::json!({
1886            "type": "Pane Back Drop",
1887            "view": self.child_view,
1888            "child": self.child.debug(view, cx),
1889        })
1890    }
1891}
1892
1893#[cfg(test)]
1894mod tests {
1895    use super::*;
1896    use crate::item::test::{TestItem, TestProjectItem};
1897    use gpui::TestAppContext;
1898    use project::FakeFs;
1899    use settings::SettingsStore;
1900
1901    #[gpui::test]
1902    async fn test_remove_active_empty(cx: &mut TestAppContext) {
1903        init_test(cx);
1904        let fs = FakeFs::new(cx.background());
1905
1906        let project = Project::test(fs, None, cx).await;
1907        let (_, workspace) = cx.add_window(|cx| Workspace::test_new(project.clone(), cx));
1908        let pane = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
1909
1910        pane.update(cx, |pane, cx| {
1911            assert!(pane.close_active_item(&CloseActiveItem, cx).is_none())
1912        });
1913    }
1914
1915    #[gpui::test]
1916    async fn test_add_item_with_new_item(cx: &mut TestAppContext) {
1917        cx.foreground().forbid_parking();
1918        init_test(cx);
1919        let fs = FakeFs::new(cx.background());
1920
1921        let project = Project::test(fs, None, cx).await;
1922        let (_, workspace) = cx.add_window(|cx| Workspace::test_new(project.clone(), cx));
1923        let pane = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
1924
1925        // 1. Add with a destination index
1926        //   a. Add before the active item
1927        set_labeled_items(&pane, ["A", "B*", "C"], cx);
1928        pane.update(cx, |pane, cx| {
1929            pane.add_item(
1930                Box::new(cx.add_view(|_| TestItem::new().with_label("D"))),
1931                false,
1932                false,
1933                Some(0),
1934                cx,
1935            );
1936        });
1937        assert_item_labels(&pane, ["D*", "A", "B", "C"], cx);
1938
1939        //   b. Add after the active item
1940        set_labeled_items(&pane, ["A", "B*", "C"], cx);
1941        pane.update(cx, |pane, cx| {
1942            pane.add_item(
1943                Box::new(cx.add_view(|_| TestItem::new().with_label("D"))),
1944                false,
1945                false,
1946                Some(2),
1947                cx,
1948            );
1949        });
1950        assert_item_labels(&pane, ["A", "B", "D*", "C"], cx);
1951
1952        //   c. Add at the end of the item list (including off the length)
1953        set_labeled_items(&pane, ["A", "B*", "C"], cx);
1954        pane.update(cx, |pane, cx| {
1955            pane.add_item(
1956                Box::new(cx.add_view(|_| TestItem::new().with_label("D"))),
1957                false,
1958                false,
1959                Some(5),
1960                cx,
1961            );
1962        });
1963        assert_item_labels(&pane, ["A", "B", "C", "D*"], cx);
1964
1965        // 2. Add without a destination index
1966        //   a. Add with active item at the start of the item list
1967        set_labeled_items(&pane, ["A*", "B", "C"], cx);
1968        pane.update(cx, |pane, cx| {
1969            pane.add_item(
1970                Box::new(cx.add_view(|_| TestItem::new().with_label("D"))),
1971                false,
1972                false,
1973                None,
1974                cx,
1975            );
1976        });
1977        set_labeled_items(&pane, ["A", "D*", "B", "C"], cx);
1978
1979        //   b. Add with active item at the end of the item list
1980        set_labeled_items(&pane, ["A", "B", "C*"], cx);
1981        pane.update(cx, |pane, cx| {
1982            pane.add_item(
1983                Box::new(cx.add_view(|_| TestItem::new().with_label("D"))),
1984                false,
1985                false,
1986                None,
1987                cx,
1988            );
1989        });
1990        assert_item_labels(&pane, ["A", "B", "C", "D*"], cx);
1991    }
1992
1993    #[gpui::test]
1994    async fn test_add_item_with_existing_item(cx: &mut TestAppContext) {
1995        cx.foreground().forbid_parking();
1996        init_test(cx);
1997        let fs = FakeFs::new(cx.background());
1998
1999        let project = Project::test(fs, None, cx).await;
2000        let (_, workspace) = cx.add_window(|cx| Workspace::test_new(project.clone(), cx));
2001        let pane = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
2002
2003        // 1. Add with a destination index
2004        //   1a. Add before the active item
2005        let [_, _, _, d] = set_labeled_items(&pane, ["A", "B*", "C", "D"], cx);
2006        pane.update(cx, |pane, cx| {
2007            pane.add_item(d, false, false, Some(0), cx);
2008        });
2009        assert_item_labels(&pane, ["D*", "A", "B", "C"], cx);
2010
2011        //   1b. Add after the active item
2012        let [_, _, _, d] = set_labeled_items(&pane, ["A", "B*", "C", "D"], cx);
2013        pane.update(cx, |pane, cx| {
2014            pane.add_item(d, false, false, Some(2), cx);
2015        });
2016        assert_item_labels(&pane, ["A", "B", "D*", "C"], cx);
2017
2018        //   1c. Add at the end of the item list (including off the length)
2019        let [a, _, _, _] = set_labeled_items(&pane, ["A", "B*", "C", "D"], cx);
2020        pane.update(cx, |pane, cx| {
2021            pane.add_item(a, false, false, Some(5), cx);
2022        });
2023        assert_item_labels(&pane, ["B", "C", "D", "A*"], cx);
2024
2025        //   1d. Add same item to active index
2026        let [_, b, _] = set_labeled_items(&pane, ["A", "B*", "C"], cx);
2027        pane.update(cx, |pane, cx| {
2028            pane.add_item(b, false, false, Some(1), cx);
2029        });
2030        assert_item_labels(&pane, ["A", "B*", "C"], cx);
2031
2032        //   1e. Add item to index after same item in last position
2033        let [_, _, c] = set_labeled_items(&pane, ["A", "B*", "C"], cx);
2034        pane.update(cx, |pane, cx| {
2035            pane.add_item(c, false, false, Some(2), cx);
2036        });
2037        assert_item_labels(&pane, ["A", "B", "C*"], cx);
2038
2039        // 2. Add without a destination index
2040        //   2a. Add with active item at the start of the item list
2041        let [_, _, _, d] = set_labeled_items(&pane, ["A*", "B", "C", "D"], cx);
2042        pane.update(cx, |pane, cx| {
2043            pane.add_item(d, false, false, None, cx);
2044        });
2045        assert_item_labels(&pane, ["A", "D*", "B", "C"], cx);
2046
2047        //   2b. Add with active item at the end of the item list
2048        let [a, _, _, _] = set_labeled_items(&pane, ["A", "B", "C", "D*"], cx);
2049        pane.update(cx, |pane, cx| {
2050            pane.add_item(a, false, false, None, cx);
2051        });
2052        assert_item_labels(&pane, ["B", "C", "D", "A*"], cx);
2053
2054        //   2c. Add active item to active item at end of list
2055        let [_, _, c] = set_labeled_items(&pane, ["A", "B", "C*"], cx);
2056        pane.update(cx, |pane, cx| {
2057            pane.add_item(c, false, false, None, cx);
2058        });
2059        assert_item_labels(&pane, ["A", "B", "C*"], cx);
2060
2061        //   2d. Add active item to active item at start of list
2062        let [a, _, _] = set_labeled_items(&pane, ["A*", "B", "C"], cx);
2063        pane.update(cx, |pane, cx| {
2064            pane.add_item(a, false, false, None, cx);
2065        });
2066        assert_item_labels(&pane, ["A*", "B", "C"], cx);
2067    }
2068
2069    #[gpui::test]
2070    async fn test_add_item_with_same_project_entries(cx: &mut TestAppContext) {
2071        cx.foreground().forbid_parking();
2072        init_test(cx);
2073        let fs = FakeFs::new(cx.background());
2074
2075        let project = Project::test(fs, None, cx).await;
2076        let (_, workspace) = cx.add_window(|cx| Workspace::test_new(project.clone(), cx));
2077        let pane = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
2078
2079        // singleton view
2080        pane.update(cx, |pane, cx| {
2081            let item = TestItem::new()
2082                .with_singleton(true)
2083                .with_label("buffer 1")
2084                .with_project_items(&[TestProjectItem::new(1, "one.txt", cx)]);
2085
2086            pane.add_item(Box::new(cx.add_view(|_| item)), false, false, None, cx);
2087        });
2088        assert_item_labels(&pane, ["buffer 1*"], cx);
2089
2090        // new singleton view with the same project entry
2091        pane.update(cx, |pane, cx| {
2092            let item = TestItem::new()
2093                .with_singleton(true)
2094                .with_label("buffer 1")
2095                .with_project_items(&[TestProjectItem::new(1, "1.txt", cx)]);
2096
2097            pane.add_item(Box::new(cx.add_view(|_| item)), false, false, None, cx);
2098        });
2099        assert_item_labels(&pane, ["buffer 1*"], cx);
2100
2101        // new singleton view with different project entry
2102        pane.update(cx, |pane, cx| {
2103            let item = TestItem::new()
2104                .with_singleton(true)
2105                .with_label("buffer 2")
2106                .with_project_items(&[TestProjectItem::new(2, "2.txt", cx)]);
2107            pane.add_item(Box::new(cx.add_view(|_| item)), false, false, None, cx);
2108        });
2109        assert_item_labels(&pane, ["buffer 1", "buffer 2*"], cx);
2110
2111        // new multibuffer view with the same project entry
2112        pane.update(cx, |pane, cx| {
2113            let item = TestItem::new()
2114                .with_singleton(false)
2115                .with_label("multibuffer 1")
2116                .with_project_items(&[TestProjectItem::new(1, "1.txt", cx)]);
2117
2118            pane.add_item(Box::new(cx.add_view(|_| item)), false, false, None, cx);
2119        });
2120        assert_item_labels(&pane, ["buffer 1", "buffer 2", "multibuffer 1*"], cx);
2121
2122        // another multibuffer view with the same project entry
2123        pane.update(cx, |pane, cx| {
2124            let item = TestItem::new()
2125                .with_singleton(false)
2126                .with_label("multibuffer 1b")
2127                .with_project_items(&[TestProjectItem::new(1, "1.txt", cx)]);
2128
2129            pane.add_item(Box::new(cx.add_view(|_| item)), false, false, None, cx);
2130        });
2131        assert_item_labels(
2132            &pane,
2133            ["buffer 1", "buffer 2", "multibuffer 1", "multibuffer 1b*"],
2134            cx,
2135        );
2136    }
2137
2138    #[gpui::test]
2139    async fn test_remove_item_ordering(cx: &mut TestAppContext) {
2140        init_test(cx);
2141        let fs = FakeFs::new(cx.background());
2142
2143        let project = Project::test(fs, None, cx).await;
2144        let (_, workspace) = cx.add_window(|cx| Workspace::test_new(project.clone(), cx));
2145        let pane = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
2146
2147        add_labeled_item(&pane, "A", false, cx);
2148        add_labeled_item(&pane, "B", false, cx);
2149        add_labeled_item(&pane, "C", false, cx);
2150        add_labeled_item(&pane, "D", false, cx);
2151        assert_item_labels(&pane, ["A", "B", "C", "D*"], cx);
2152
2153        pane.update(cx, |pane, cx| pane.activate_item(1, false, false, cx));
2154        add_labeled_item(&pane, "1", false, cx);
2155        assert_item_labels(&pane, ["A", "B", "1*", "C", "D"], cx);
2156
2157        pane.update(cx, |pane, cx| pane.close_active_item(&CloseActiveItem, cx))
2158            .unwrap()
2159            .await
2160            .unwrap();
2161        assert_item_labels(&pane, ["A", "B*", "C", "D"], cx);
2162
2163        pane.update(cx, |pane, cx| pane.activate_item(3, false, false, cx));
2164        assert_item_labels(&pane, ["A", "B", "C", "D*"], cx);
2165
2166        pane.update(cx, |pane, cx| pane.close_active_item(&CloseActiveItem, cx))
2167            .unwrap()
2168            .await
2169            .unwrap();
2170        assert_item_labels(&pane, ["A", "B*", "C"], cx);
2171
2172        pane.update(cx, |pane, cx| pane.close_active_item(&CloseActiveItem, cx))
2173            .unwrap()
2174            .await
2175            .unwrap();
2176        assert_item_labels(&pane, ["A", "C*"], cx);
2177
2178        pane.update(cx, |pane, cx| pane.close_active_item(&CloseActiveItem, cx))
2179            .unwrap()
2180            .await
2181            .unwrap();
2182        assert_item_labels(&pane, ["A*"], cx);
2183    }
2184
2185    #[gpui::test]
2186    async fn test_close_inactive_items(cx: &mut TestAppContext) {
2187        init_test(cx);
2188        let fs = FakeFs::new(cx.background());
2189
2190        let project = Project::test(fs, None, cx).await;
2191        let (_, workspace) = cx.add_window(|cx| Workspace::test_new(project.clone(), cx));
2192        let pane = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
2193
2194        set_labeled_items(&pane, ["A", "B", "C*", "D", "E"], cx);
2195
2196        pane.update(cx, |pane, cx| {
2197            pane.close_inactive_items(&CloseInactiveItems, cx)
2198        })
2199        .unwrap()
2200        .await
2201        .unwrap();
2202        assert_item_labels(&pane, ["C*"], cx);
2203    }
2204
2205    #[gpui::test]
2206    async fn test_close_clean_items(cx: &mut TestAppContext) {
2207        init_test(cx);
2208        let fs = FakeFs::new(cx.background());
2209
2210        let project = Project::test(fs, None, cx).await;
2211        let (_, workspace) = cx.add_window(|cx| Workspace::test_new(project.clone(), cx));
2212        let pane = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
2213
2214        add_labeled_item(&pane, "A", true, cx);
2215        add_labeled_item(&pane, "B", false, cx);
2216        add_labeled_item(&pane, "C", true, cx);
2217        add_labeled_item(&pane, "D", false, cx);
2218        add_labeled_item(&pane, "E", false, cx);
2219        assert_item_labels(&pane, ["A^", "B", "C^", "D", "E*"], cx);
2220
2221        pane.update(cx, |pane, cx| pane.close_clean_items(&CloseCleanItems, cx))
2222            .unwrap()
2223            .await
2224            .unwrap();
2225        assert_item_labels(&pane, ["A^", "C*^"], cx);
2226    }
2227
2228    #[gpui::test]
2229    async fn test_close_items_to_the_left(cx: &mut TestAppContext) {
2230        init_test(cx);
2231        let fs = FakeFs::new(cx.background());
2232
2233        let project = Project::test(fs, None, cx).await;
2234        let (_, workspace) = cx.add_window(|cx| Workspace::test_new(project.clone(), cx));
2235        let pane = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
2236
2237        set_labeled_items(&pane, ["A", "B", "C*", "D", "E"], cx);
2238
2239        pane.update(cx, |pane, cx| {
2240            pane.close_items_to_the_left(&CloseItemsToTheLeft, cx)
2241        })
2242        .unwrap()
2243        .await
2244        .unwrap();
2245        assert_item_labels(&pane, ["C*", "D", "E"], cx);
2246    }
2247
2248    #[gpui::test]
2249    async fn test_close_items_to_the_right(cx: &mut TestAppContext) {
2250        init_test(cx);
2251        let fs = FakeFs::new(cx.background());
2252
2253        let project = Project::test(fs, None, cx).await;
2254        let (_, workspace) = cx.add_window(|cx| Workspace::test_new(project.clone(), cx));
2255        let pane = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
2256
2257        set_labeled_items(&pane, ["A", "B", "C*", "D", "E"], cx);
2258
2259        pane.update(cx, |pane, cx| {
2260            pane.close_items_to_the_right(&CloseItemsToTheRight, cx)
2261        })
2262        .unwrap()
2263        .await
2264        .unwrap();
2265        assert_item_labels(&pane, ["A", "B", "C*"], cx);
2266    }
2267
2268    #[gpui::test]
2269    async fn test_close_all_items(cx: &mut TestAppContext) {
2270        init_test(cx);
2271        let fs = FakeFs::new(cx.background());
2272
2273        let project = Project::test(fs, None, cx).await;
2274        let (_, workspace) = cx.add_window(|cx| Workspace::test_new(project.clone(), cx));
2275        let pane = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
2276
2277        add_labeled_item(&pane, "A", false, cx);
2278        add_labeled_item(&pane, "B", false, cx);
2279        add_labeled_item(&pane, "C", false, cx);
2280        assert_item_labels(&pane, ["A", "B", "C*"], cx);
2281
2282        pane.update(cx, |pane, cx| pane.close_all_items(&CloseAllItems, cx))
2283            .unwrap()
2284            .await
2285            .unwrap();
2286        assert_item_labels(&pane, [], cx);
2287    }
2288
2289    fn init_test(cx: &mut TestAppContext) {
2290        cx.update(|cx| {
2291            cx.set_global(SettingsStore::test(cx));
2292            theme::init((), cx);
2293            crate::init_settings(cx);
2294        });
2295    }
2296
2297    fn add_labeled_item(
2298        pane: &ViewHandle<Pane>,
2299        label: &str,
2300        is_dirty: bool,
2301        cx: &mut TestAppContext,
2302    ) -> Box<ViewHandle<TestItem>> {
2303        pane.update(cx, |pane, cx| {
2304            let labeled_item =
2305                Box::new(cx.add_view(|_| TestItem::new().with_label(label).with_dirty(is_dirty)));
2306            pane.add_item(labeled_item.clone(), false, false, None, cx);
2307            labeled_item
2308        })
2309    }
2310
2311    fn set_labeled_items<const COUNT: usize>(
2312        pane: &ViewHandle<Pane>,
2313        labels: [&str; COUNT],
2314        cx: &mut TestAppContext,
2315    ) -> [Box<ViewHandle<TestItem>>; COUNT] {
2316        pane.update(cx, |pane, cx| {
2317            pane.items.clear();
2318            let mut active_item_index = 0;
2319
2320            let mut index = 0;
2321            let items = labels.map(|mut label| {
2322                if label.ends_with("*") {
2323                    label = label.trim_end_matches("*");
2324                    active_item_index = index;
2325                }
2326
2327                let labeled_item = Box::new(cx.add_view(|_| TestItem::new().with_label(label)));
2328                pane.add_item(labeled_item.clone(), false, false, None, cx);
2329                index += 1;
2330                labeled_item
2331            });
2332
2333            pane.activate_item(active_item_index, false, false, cx);
2334
2335            items
2336        })
2337    }
2338
2339    // Assert the item label, with the active item label suffixed with a '*'
2340    fn assert_item_labels<const COUNT: usize>(
2341        pane: &ViewHandle<Pane>,
2342        expected_states: [&str; COUNT],
2343        cx: &mut TestAppContext,
2344    ) {
2345        pane.read_with(cx, |pane, cx| {
2346            let actual_states = pane
2347                .items
2348                .iter()
2349                .enumerate()
2350                .map(|(ix, item)| {
2351                    let mut state = item
2352                        .as_any()
2353                        .downcast_ref::<TestItem>()
2354                        .unwrap()
2355                        .read(cx)
2356                        .label
2357                        .clone();
2358                    if ix == pane.active_item_index {
2359                        state.push('*');
2360                    }
2361                    if item.is_dirty(cx) {
2362                        state.push('^');
2363                    }
2364                    state
2365                })
2366                .collect::<Vec<_>>();
2367
2368            assert_eq!(
2369                actual_states, expected_states,
2370                "pane items do not match expectation"
2371            );
2372        })
2373    }
2374}