1mod dragged_item_receiver;
   2
   3use super::{ItemHandle, SplitDirection};
   4use crate::{
   5    dock::{icon_for_dock_anchor, AnchorDockBottom, AnchorDockRight, ExpandDock, HideDock},
   6    item::WeakItemHandle,
   7    toolbar::Toolbar,
   8    Item, NewFile, NewSearch, NewTerminal, Workspace,
   9};
  10use anyhow::{anyhow, Result};
  11use collections::{HashMap, HashSet, VecDeque};
  12use context_menu::{ContextMenu, ContextMenuItem};
  13use drag_and_drop::Draggable;
  14pub use dragged_item_receiver::{dragged_item_receiver, handle_dropped_item};
  15use futures::StreamExt;
  16use gpui::{
  17    actions,
  18    elements::*,
  19    geometry::{
  20        rect::RectF,
  21        vector::{vec2f, Vector2F},
  22    },
  23    impl_actions, impl_internal_actions,
  24    keymap_matcher::KeymapContext,
  25    platform::{CursorStyle, MouseButton, NavigationDirection, PromptLevel},
  26    Action, AnyViewHandle, AnyWeakViewHandle, AppContext, AsyncAppContext, Entity, ModelHandle,
  27    MouseRegion, Quad, Task, View, ViewContext, ViewHandle, WeakViewHandle, WindowContext,
  28};
  29use project::{Project, ProjectEntryId, ProjectPath};
  30use serde::Deserialize;
  31use settings::{Autosave, DockAnchor, Settings};
  32use std::{any::Any, cell::RefCell, cmp, mem, path::Path, rc::Rc};
  33use theme::Theme;
  34use util::ResultExt;
  35
  36#[derive(Clone, Deserialize, PartialEq)]
  37pub struct ActivateItem(pub usize);
  38
  39#[derive(Clone, PartialEq)]
  40pub struct CloseItemById {
  41    pub item_id: usize,
  42    pub pane: WeakViewHandle<Pane>,
  43}
  44
  45#[derive(Clone, PartialEq)]
  46pub struct CloseItemsToTheLeftById {
  47    pub item_id: usize,
  48    pub pane: WeakViewHandle<Pane>,
  49}
  50
  51#[derive(Clone, PartialEq)]
  52pub struct CloseItemsToTheRightById {
  53    pub item_id: usize,
  54    pub pane: WeakViewHandle<Pane>,
  55}
  56
  57actions!(
  58    pane,
  59    [
  60        ActivatePrevItem,
  61        ActivateNextItem,
  62        ActivateLastItem,
  63        CloseActiveItem,
  64        CloseInactiveItems,
  65        CloseCleanItems,
  66        CloseItemsToTheLeft,
  67        CloseItemsToTheRight,
  68        CloseAllItems,
  69        ReopenClosedItem,
  70        SplitLeft,
  71        SplitUp,
  72        SplitRight,
  73        SplitDown,
  74    ]
  75);
  76
  77#[derive(Clone, PartialEq)]
  78pub struct MoveItem {
  79    pub item_id: usize,
  80    pub from: WeakViewHandle<Pane>,
  81    pub to: WeakViewHandle<Pane>,
  82    pub destination_index: usize,
  83}
  84
  85#[derive(Clone, Deserialize, PartialEq)]
  86pub struct GoBack {
  87    #[serde(skip_deserializing)]
  88    pub pane: Option<WeakViewHandle<Pane>>,
  89}
  90
  91#[derive(Clone, Deserialize, PartialEq)]
  92pub struct GoForward {
  93    #[serde(skip_deserializing)]
  94    pub pane: Option<WeakViewHandle<Pane>>,
  95}
  96
  97#[derive(Clone, PartialEq)]
  98pub struct DeploySplitMenu;
  99
 100#[derive(Clone, PartialEq)]
 101pub struct DeployDockMenu;
 102
 103#[derive(Clone, PartialEq)]
 104pub struct DeployNewMenu;
 105
 106#[derive(Clone, PartialEq)]
 107pub struct DeployTabContextMenu {
 108    pub position: Vector2F,
 109    pub item_id: usize,
 110    pub pane: WeakViewHandle<Pane>,
 111}
 112
 113impl_actions!(pane, [GoBack, GoForward, ActivateItem]);
 114impl_internal_actions!(
 115    pane,
 116    [
 117        CloseItemById,
 118        CloseItemsToTheLeftById,
 119        CloseItemsToTheRightById,
 120        DeployTabContextMenu,
 121        DeploySplitMenu,
 122        DeployNewMenu,
 123        DeployDockMenu,
 124        MoveItem
 125    ]
 126);
 127
 128const MAX_NAVIGATION_HISTORY_LEN: usize = 1024;
 129
 130pub type BackgroundActions = fn() -> &'static [(&'static str, &'static dyn Action)];
 131
 132pub fn init(cx: &mut AppContext) {
 133    cx.add_action(|pane: &mut Pane, action: &ActivateItem, cx| {
 134        pane.activate_item(action.0, true, true, cx);
 135    });
 136    cx.add_action(|pane: &mut Pane, _: &ActivateLastItem, cx| {
 137        pane.activate_item(pane.items.len() - 1, true, true, cx);
 138    });
 139    cx.add_action(|pane: &mut Pane, _: &ActivatePrevItem, cx| {
 140        pane.activate_prev_item(true, cx);
 141    });
 142    cx.add_action(|pane: &mut Pane, _: &ActivateNextItem, cx| {
 143        pane.activate_next_item(true, cx);
 144    });
 145    cx.add_async_action(Pane::close_active_item);
 146    cx.add_async_action(Pane::close_inactive_items);
 147    cx.add_async_action(Pane::close_clean_items);
 148    cx.add_async_action(Pane::close_items_to_the_left);
 149    cx.add_async_action(Pane::close_items_to_the_right);
 150    cx.add_async_action(Pane::close_all_items);
 151    cx.add_async_action(|workspace: &mut Workspace, action: &CloseItemById, cx| {
 152        let pane = action.pane.upgrade(cx)?;
 153        let task = Pane::close_item_by_id(workspace, pane, action.item_id, cx);
 154        Some(cx.foreground().spawn(async move {
 155            task.await?;
 156            Ok(())
 157        }))
 158    });
 159    cx.add_async_action(
 160        |workspace: &mut Workspace, action: &CloseItemsToTheLeftById, cx| {
 161            let pane = action.pane.upgrade(cx)?;
 162            let task = Pane::close_items_to_the_left_by_id(workspace, pane, action.item_id, cx);
 163            Some(cx.foreground().spawn(async move {
 164                task.await?;
 165                Ok(())
 166            }))
 167        },
 168    );
 169    cx.add_async_action(
 170        |workspace: &mut Workspace, action: &CloseItemsToTheRightById, cx| {
 171            let pane = action.pane.upgrade(cx)?;
 172            let task = Pane::close_items_to_the_right_by_id(workspace, pane, action.item_id, cx);
 173            Some(cx.foreground().spawn(async move {
 174                task.await?;
 175                Ok(())
 176            }))
 177        },
 178    );
 179    cx.add_action(
 180        |workspace,
 181         MoveItem {
 182             from,
 183             to,
 184             item_id,
 185             destination_index,
 186         },
 187         cx| {
 188            // Get item handle to move
 189            let from = if let Some(from) = from.upgrade(cx) {
 190                from
 191            } else {
 192                return;
 193            };
 194
 195            // Add item to new pane at given index
 196            let to = if let Some(to) = to.upgrade(cx) {
 197                to
 198            } else {
 199                return;
 200            };
 201
 202            Pane::move_item(workspace, from, to, *item_id, *destination_index, cx)
 203        },
 204    );
 205    cx.add_action(|pane: &mut Pane, _: &SplitLeft, cx| pane.split(SplitDirection::Left, cx));
 206    cx.add_action(|pane: &mut Pane, _: &SplitUp, cx| pane.split(SplitDirection::Up, cx));
 207    cx.add_action(|pane: &mut Pane, _: &SplitRight, cx| pane.split(SplitDirection::Right, cx));
 208    cx.add_action(|pane: &mut Pane, _: &SplitDown, cx| pane.split(SplitDirection::Down, cx));
 209    cx.add_action(Pane::deploy_split_menu);
 210    cx.add_action(Pane::deploy_dock_menu);
 211    cx.add_action(Pane::deploy_new_menu);
 212    cx.add_action(Pane::deploy_tab_context_menu);
 213    cx.add_action(|workspace: &mut Workspace, _: &ReopenClosedItem, cx| {
 214        Pane::reopen_closed_item(workspace, cx).detach();
 215    });
 216    cx.add_action(|workspace: &mut Workspace, action: &GoBack, cx| {
 217        Pane::go_back(
 218            workspace,
 219            action
 220                .pane
 221                .as_ref()
 222                .and_then(|weak_handle| weak_handle.upgrade(cx)),
 223            cx,
 224        )
 225        .detach();
 226    });
 227    cx.add_action(|workspace: &mut Workspace, action: &GoForward, cx| {
 228        Pane::go_forward(
 229            workspace,
 230            action
 231                .pane
 232                .as_ref()
 233                .and_then(|weak_handle| weak_handle.upgrade(cx)),
 234            cx,
 235        )
 236        .detach();
 237    });
 238}
 239
 240#[derive(Debug)]
 241pub enum Event {
 242    ActivateItem { local: bool },
 243    Remove,
 244    RemoveItem { item_id: usize },
 245    Split(SplitDirection),
 246    ChangeItemTitle,
 247}
 248
 249pub struct Pane {
 250    items: Vec<Box<dyn ItemHandle>>,
 251    activation_history: Vec<usize>,
 252    is_active: bool,
 253    active_item_index: usize,
 254    last_focused_view_by_item: HashMap<usize, AnyWeakViewHandle>,
 255    autoscroll: bool,
 256    nav_history: Rc<RefCell<NavHistory>>,
 257    toolbar: ViewHandle<Toolbar>,
 258    tab_bar_context_menu: TabBarContextMenu,
 259    tab_context_menu: ViewHandle<ContextMenu>,
 260    docked: Option<DockAnchor>,
 261    _background_actions: BackgroundActions,
 262    _workspace_id: usize,
 263}
 264
 265pub struct ItemNavHistory {
 266    history: Rc<RefCell<NavHistory>>,
 267    item: Rc<dyn WeakItemHandle>,
 268}
 269
 270struct NavHistory {
 271    mode: NavigationMode,
 272    backward_stack: VecDeque<NavigationEntry>,
 273    forward_stack: VecDeque<NavigationEntry>,
 274    closed_stack: VecDeque<NavigationEntry>,
 275    paths_by_item: HashMap<usize, ProjectPath>,
 276    pane: WeakViewHandle<Pane>,
 277}
 278
 279#[derive(Copy, Clone)]
 280enum NavigationMode {
 281    Normal,
 282    GoingBack,
 283    GoingForward,
 284    ClosingItem,
 285    ReopeningClosedItem,
 286    Disabled,
 287}
 288
 289impl Default for NavigationMode {
 290    fn default() -> Self {
 291        Self::Normal
 292    }
 293}
 294
 295pub struct NavigationEntry {
 296    pub item: Rc<dyn WeakItemHandle>,
 297    pub data: Option<Box<dyn Any>>,
 298}
 299
 300struct DraggedItem {
 301    item: Box<dyn ItemHandle>,
 302    pane: WeakViewHandle<Pane>,
 303}
 304
 305pub enum ReorderBehavior {
 306    None,
 307    MoveAfterActive,
 308    MoveToIndex(usize),
 309}
 310
 311#[derive(Debug, Clone, Copy, PartialEq, Eq)]
 312enum TabBarContextMenuKind {
 313    New,
 314    Split,
 315    Dock,
 316}
 317
 318struct TabBarContextMenu {
 319    kind: TabBarContextMenuKind,
 320    handle: ViewHandle<ContextMenu>,
 321}
 322
 323impl TabBarContextMenu {
 324    fn handle_if_kind(&self, kind: TabBarContextMenuKind) -> Option<ViewHandle<ContextMenu>> {
 325        if self.kind == kind {
 326            return Some(self.handle.clone());
 327        }
 328        None
 329    }
 330}
 331
 332impl Pane {
 333    pub fn new(
 334        workspace_id: usize,
 335        docked: Option<DockAnchor>,
 336        background_actions: BackgroundActions,
 337        cx: &mut ViewContext<Self>,
 338    ) -> Self {
 339        let handle = cx.weak_handle();
 340        let context_menu = cx.add_view(ContextMenu::new);
 341        context_menu.update(cx, |menu, _| {
 342            menu.set_position_mode(OverlayPositionMode::Local)
 343        });
 344
 345        Self {
 346            items: Vec::new(),
 347            activation_history: Vec::new(),
 348            is_active: true,
 349            active_item_index: 0,
 350            last_focused_view_by_item: Default::default(),
 351            autoscroll: false,
 352            nav_history: Rc::new(RefCell::new(NavHistory {
 353                mode: NavigationMode::Normal,
 354                backward_stack: Default::default(),
 355                forward_stack: Default::default(),
 356                closed_stack: Default::default(),
 357                paths_by_item: Default::default(),
 358                pane: handle.clone(),
 359            })),
 360            toolbar: cx.add_view(|_| Toolbar::new(handle)),
 361            tab_bar_context_menu: TabBarContextMenu {
 362                kind: TabBarContextMenuKind::New,
 363                handle: context_menu,
 364            },
 365            tab_context_menu: cx.add_view(ContextMenu::new),
 366            docked,
 367            _background_actions: background_actions,
 368            _workspace_id: workspace_id,
 369        }
 370    }
 371
 372    pub fn is_active(&self) -> bool {
 373        self.is_active
 374    }
 375
 376    pub fn set_active(&mut self, is_active: bool, cx: &mut ViewContext<Self>) {
 377        self.is_active = is_active;
 378        cx.notify();
 379    }
 380
 381    pub fn set_docked(&mut self, docked: Option<DockAnchor>, cx: &mut ViewContext<Self>) {
 382        self.docked = docked;
 383        cx.notify();
 384    }
 385
 386    pub fn nav_history_for_item<T: Item>(&self, item: &ViewHandle<T>) -> ItemNavHistory {
 387        ItemNavHistory {
 388            history: self.nav_history.clone(),
 389            item: Rc::new(item.downgrade()),
 390        }
 391    }
 392
 393    pub fn go_back(
 394        workspace: &mut Workspace,
 395        pane: Option<ViewHandle<Pane>>,
 396        cx: &mut ViewContext<Workspace>,
 397    ) -> Task<Result<()>> {
 398        Self::navigate_history(
 399            workspace,
 400            pane.unwrap_or_else(|| workspace.active_pane().clone()),
 401            NavigationMode::GoingBack,
 402            cx,
 403        )
 404    }
 405
 406    pub fn go_forward(
 407        workspace: &mut Workspace,
 408        pane: Option<ViewHandle<Pane>>,
 409        cx: &mut ViewContext<Workspace>,
 410    ) -> Task<Result<()>> {
 411        Self::navigate_history(
 412            workspace,
 413            pane.unwrap_or_else(|| workspace.active_pane().clone()),
 414            NavigationMode::GoingForward,
 415            cx,
 416        )
 417    }
 418
 419    pub fn reopen_closed_item(
 420        workspace: &mut Workspace,
 421        cx: &mut ViewContext<Workspace>,
 422    ) -> Task<Result<()>> {
 423        Self::navigate_history(
 424            workspace,
 425            workspace.active_pane().clone(),
 426            NavigationMode::ReopeningClosedItem,
 427            cx,
 428        )
 429    }
 430
 431    pub fn disable_history(&mut self) {
 432        self.nav_history.borrow_mut().disable();
 433    }
 434
 435    pub fn enable_history(&mut self) {
 436        self.nav_history.borrow_mut().enable();
 437    }
 438
 439    pub fn can_navigate_backward(&self) -> bool {
 440        !self.nav_history.borrow().backward_stack.is_empty()
 441    }
 442
 443    pub fn can_navigate_forward(&self) -> bool {
 444        !self.nav_history.borrow().forward_stack.is_empty()
 445    }
 446
 447    fn history_updated(&mut self, cx: &mut ViewContext<Self>) {
 448        self.toolbar.update(cx, |_, cx| cx.notify());
 449    }
 450
 451    fn navigate_history(
 452        workspace: &mut Workspace,
 453        pane: ViewHandle<Pane>,
 454        mode: NavigationMode,
 455        cx: &mut ViewContext<Workspace>,
 456    ) -> Task<Result<()>> {
 457        cx.focus(&pane);
 458
 459        let to_load = pane.update(cx, |pane, cx| {
 460            loop {
 461                // Retrieve the weak item handle from the history.
 462                let entry = pane.nav_history.borrow_mut().pop(mode, cx)?;
 463
 464                // If the item is still present in this pane, then activate it.
 465                if let Some(index) = entry
 466                    .item
 467                    .upgrade(cx)
 468                    .and_then(|v| pane.index_for_item(v.as_ref()))
 469                {
 470                    let prev_active_item_index = pane.active_item_index;
 471                    pane.nav_history.borrow_mut().set_mode(mode);
 472                    pane.activate_item(index, true, true, cx);
 473                    pane.nav_history
 474                        .borrow_mut()
 475                        .set_mode(NavigationMode::Normal);
 476
 477                    let mut navigated = prev_active_item_index != pane.active_item_index;
 478                    if let Some(data) = entry.data {
 479                        navigated |= pane.active_item()?.navigate(data, cx);
 480                    }
 481
 482                    if navigated {
 483                        break None;
 484                    }
 485                }
 486                // If the item is no longer present in this pane, then retrieve its
 487                // project path in order to reopen it.
 488                else {
 489                    break pane
 490                        .nav_history
 491                        .borrow()
 492                        .paths_by_item
 493                        .get(&entry.item.id())
 494                        .cloned()
 495                        .map(|project_path| (project_path, entry));
 496                }
 497            }
 498        });
 499
 500        if let Some((project_path, entry)) = to_load {
 501            // If the item was no longer present, then load it again from its previous path.
 502            let pane = pane.downgrade();
 503            let task = workspace.load_path(project_path, cx);
 504            cx.spawn(|workspace, mut cx| async move {
 505                let task = task.await;
 506                let pane = pane
 507                    .upgrade(&cx)
 508                    .ok_or_else(|| anyhow!("pane was dropped"))?;
 509                let mut navigated = false;
 510                if let Some((project_entry_id, build_item)) = task.log_err() {
 511                    let prev_active_item_id = pane.update(&mut cx, |pane, _| {
 512                        pane.nav_history.borrow_mut().set_mode(mode);
 513                        pane.active_item().map(|p| p.id())
 514                    })?;
 515
 516                    let item = workspace.update(&mut cx, |workspace, cx| {
 517                        Self::open_item(
 518                            workspace,
 519                            pane.clone(),
 520                            project_entry_id,
 521                            true,
 522                            cx,
 523                            build_item,
 524                        )
 525                    })?;
 526
 527                    pane.update(&mut cx, |pane, cx| {
 528                        navigated |= Some(item.id()) != prev_active_item_id;
 529                        pane.nav_history
 530                            .borrow_mut()
 531                            .set_mode(NavigationMode::Normal);
 532                        if let Some(data) = entry.data {
 533                            navigated |= item.navigate(data, cx);
 534                        }
 535                    })?;
 536                }
 537
 538                if !navigated {
 539                    workspace
 540                        .update(&mut cx, |workspace, cx| {
 541                            Self::navigate_history(workspace, pane, mode, cx)
 542                        })?
 543                        .await?;
 544                }
 545
 546                Ok(())
 547            })
 548        } else {
 549            Task::ready(Ok(()))
 550        }
 551    }
 552
 553    pub(crate) fn open_item(
 554        workspace: &mut Workspace,
 555        pane: ViewHandle<Pane>,
 556        project_entry_id: ProjectEntryId,
 557        focus_item: bool,
 558        cx: &mut ViewContext<Workspace>,
 559        build_item: impl FnOnce(&mut ViewContext<Pane>) -> Box<dyn ItemHandle>,
 560    ) -> Box<dyn ItemHandle> {
 561        let existing_item = pane.update(cx, |pane, cx| {
 562            for (index, item) in pane.items.iter().enumerate() {
 563                if item.is_singleton(cx)
 564                    && item.project_entry_ids(cx).as_slice() == [project_entry_id]
 565                {
 566                    let item = item.boxed_clone();
 567                    return Some((index, item));
 568                }
 569            }
 570            None
 571        });
 572
 573        if let Some((index, existing_item)) = existing_item {
 574            pane.update(cx, |pane, cx| {
 575                pane.activate_item(index, focus_item, focus_item, cx);
 576            });
 577            existing_item
 578        } else {
 579            let new_item = pane.update(cx, |_, cx| build_item(cx));
 580            Pane::add_item(
 581                workspace,
 582                &pane,
 583                new_item.clone(),
 584                true,
 585                focus_item,
 586                None,
 587                cx,
 588            );
 589            new_item
 590        }
 591    }
 592
 593    pub(crate) fn add_item(
 594        workspace: &mut Workspace,
 595        pane: &ViewHandle<Pane>,
 596        item: Box<dyn ItemHandle>,
 597        activate_pane: bool,
 598        focus_item: bool,
 599        destination_index: Option<usize>,
 600        cx: &mut ViewContext<Workspace>,
 601    ) {
 602        // If no destination index is specified, add or move the item after the active item.
 603        let mut insertion_index = {
 604            let pane = pane.read(cx);
 605            cmp::min(
 606                if let Some(destination_index) = destination_index {
 607                    destination_index
 608                } else {
 609                    pane.active_item_index + 1
 610                },
 611                pane.items.len(),
 612            )
 613        };
 614
 615        item.added_to_pane(workspace, pane.clone(), cx);
 616
 617        // Does the item already exist?
 618        let project_entry_id = if item.is_singleton(cx) {
 619            item.project_entry_ids(cx).get(0).copied()
 620        } else {
 621            None
 622        };
 623
 624        let existing_item_index = pane.read(cx).items.iter().position(|existing_item| {
 625            if existing_item.id() == item.id() {
 626                true
 627            } else if existing_item.is_singleton(cx) {
 628                existing_item
 629                    .project_entry_ids(cx)
 630                    .get(0)
 631                    .map_or(false, |existing_entry_id| {
 632                        Some(existing_entry_id) == project_entry_id.as_ref()
 633                    })
 634            } else {
 635                false
 636            }
 637        });
 638
 639        if let Some(existing_item_index) = existing_item_index {
 640            // If the item already exists, move it to the desired destination and activate it
 641            pane.update(cx, |pane, cx| {
 642                if existing_item_index != insertion_index {
 643                    cx.reparent(item.as_any());
 644                    let existing_item_is_active = existing_item_index == pane.active_item_index;
 645
 646                    // If the caller didn't specify a destination and the added item is already
 647                    // the active one, don't move it
 648                    if existing_item_is_active && destination_index.is_none() {
 649                        insertion_index = existing_item_index;
 650                    } else {
 651                        pane.items.remove(existing_item_index);
 652                        if existing_item_index < pane.active_item_index {
 653                            pane.active_item_index -= 1;
 654                        }
 655                        insertion_index = insertion_index.min(pane.items.len());
 656
 657                        pane.items.insert(insertion_index, item.clone());
 658
 659                        if existing_item_is_active {
 660                            pane.active_item_index = insertion_index;
 661                        } else if insertion_index <= pane.active_item_index {
 662                            pane.active_item_index += 1;
 663                        }
 664                    }
 665
 666                    cx.notify();
 667                }
 668
 669                pane.activate_item(insertion_index, activate_pane, focus_item, cx);
 670            });
 671        } else {
 672            pane.update(cx, |pane, cx| {
 673                cx.reparent(item.as_any());
 674                pane.items.insert(insertion_index, item);
 675                if insertion_index <= pane.active_item_index {
 676                    pane.active_item_index += 1;
 677                }
 678
 679                pane.activate_item(insertion_index, activate_pane, focus_item, cx);
 680                cx.notify();
 681            });
 682        }
 683    }
 684
 685    pub fn items_len(&self) -> usize {
 686        self.items.len()
 687    }
 688
 689    pub fn items(&self) -> impl Iterator<Item = &Box<dyn ItemHandle>> + DoubleEndedIterator {
 690        self.items.iter()
 691    }
 692
 693    pub fn items_of_type<T: View>(&self) -> impl '_ + Iterator<Item = ViewHandle<T>> {
 694        self.items
 695            .iter()
 696            .filter_map(|item| item.as_any().clone().downcast())
 697    }
 698
 699    pub fn active_item(&self) -> Option<Box<dyn ItemHandle>> {
 700        self.items.get(self.active_item_index).cloned()
 701    }
 702
 703    pub fn item_for_entry(
 704        &self,
 705        entry_id: ProjectEntryId,
 706        cx: &AppContext,
 707    ) -> Option<Box<dyn ItemHandle>> {
 708        self.items.iter().find_map(|item| {
 709            if item.is_singleton(cx) && item.project_entry_ids(cx).as_slice() == [entry_id] {
 710                Some(item.boxed_clone())
 711            } else {
 712                None
 713            }
 714        })
 715    }
 716
 717    pub fn index_for_item(&self, item: &dyn ItemHandle) -> Option<usize> {
 718        self.items.iter().position(|i| i.id() == item.id())
 719    }
 720
 721    pub fn activate_item(
 722        &mut self,
 723        index: usize,
 724        activate_pane: bool,
 725        focus_item: bool,
 726        cx: &mut ViewContext<Self>,
 727    ) {
 728        use NavigationMode::{GoingBack, GoingForward};
 729
 730        if index < self.items.len() {
 731            let prev_active_item_ix = mem::replace(&mut self.active_item_index, index);
 732            if prev_active_item_ix != self.active_item_index
 733                || matches!(self.nav_history.borrow().mode, GoingBack | GoingForward)
 734            {
 735                if let Some(prev_item) = self.items.get(prev_active_item_ix) {
 736                    prev_item.deactivated(cx);
 737                }
 738
 739                cx.emit(Event::ActivateItem {
 740                    local: activate_pane,
 741                });
 742            }
 743
 744            if let Some(newly_active_item) = self.items.get(index) {
 745                self.activation_history
 746                    .retain(|&previously_active_item_id| {
 747                        previously_active_item_id != newly_active_item.id()
 748                    });
 749                self.activation_history.push(newly_active_item.id());
 750            }
 751
 752            self.update_toolbar(cx);
 753
 754            if focus_item {
 755                self.focus_active_item(cx);
 756            }
 757
 758            self.autoscroll = true;
 759            cx.notify();
 760        }
 761    }
 762
 763    pub fn activate_prev_item(&mut self, activate_pane: bool, cx: &mut ViewContext<Self>) {
 764        let mut index = self.active_item_index;
 765        if index > 0 {
 766            index -= 1;
 767        } else if !self.items.is_empty() {
 768            index = self.items.len() - 1;
 769        }
 770        self.activate_item(index, activate_pane, activate_pane, cx);
 771    }
 772
 773    pub fn activate_next_item(&mut self, activate_pane: bool, cx: &mut ViewContext<Self>) {
 774        let mut index = self.active_item_index;
 775        if index + 1 < self.items.len() {
 776            index += 1;
 777        } else {
 778            index = 0;
 779        }
 780        self.activate_item(index, activate_pane, activate_pane, cx);
 781    }
 782
 783    pub fn close_active_item(
 784        workspace: &mut Workspace,
 785        _: &CloseActiveItem,
 786        cx: &mut ViewContext<Workspace>,
 787    ) -> Option<Task<Result<()>>> {
 788        let pane_handle = workspace.active_pane().clone();
 789        let pane = pane_handle.read(cx);
 790
 791        if pane.items.is_empty() {
 792            return None;
 793        }
 794        let active_item_id = pane.items[pane.active_item_index].id();
 795
 796        let task = Self::close_item_by_id(workspace, pane_handle, active_item_id, cx);
 797
 798        Some(cx.foreground().spawn(async move {
 799            task.await?;
 800            Ok(())
 801        }))
 802    }
 803
 804    pub fn close_item_by_id(
 805        workspace: &mut Workspace,
 806        pane: ViewHandle<Pane>,
 807        item_id_to_close: usize,
 808        cx: &mut ViewContext<Workspace>,
 809    ) -> Task<Result<()>> {
 810        Self::close_items(workspace, pane, cx, move |view_id| {
 811            view_id == item_id_to_close
 812        })
 813    }
 814
 815    pub fn close_inactive_items(
 816        workspace: &mut Workspace,
 817        _: &CloseInactiveItems,
 818        cx: &mut ViewContext<Workspace>,
 819    ) -> Option<Task<Result<()>>> {
 820        let pane_handle = workspace.active_pane().clone();
 821        let pane = pane_handle.read(cx);
 822        let active_item_id = pane.items[pane.active_item_index].id();
 823
 824        let task = Self::close_items(workspace, pane_handle, cx, move |item_id| {
 825            item_id != active_item_id
 826        });
 827
 828        Some(cx.foreground().spawn(async move {
 829            task.await?;
 830            Ok(())
 831        }))
 832    }
 833
 834    pub fn close_clean_items(
 835        workspace: &mut Workspace,
 836        _: &CloseCleanItems,
 837        cx: &mut ViewContext<Workspace>,
 838    ) -> Option<Task<Result<()>>> {
 839        let pane_handle = workspace.active_pane().clone();
 840        let pane = pane_handle.read(cx);
 841
 842        let item_ids: Vec<_> = pane
 843            .items()
 844            .filter(|item| !item.is_dirty(cx))
 845            .map(|item| item.id())
 846            .collect();
 847
 848        let task = Self::close_items(workspace, pane_handle, cx, move |item_id| {
 849            item_ids.contains(&item_id)
 850        });
 851
 852        Some(cx.foreground().spawn(async move {
 853            task.await?;
 854            Ok(())
 855        }))
 856    }
 857
 858    pub fn close_items_to_the_left(
 859        workspace: &mut Workspace,
 860        _: &CloseItemsToTheLeft,
 861        cx: &mut ViewContext<Workspace>,
 862    ) -> Option<Task<Result<()>>> {
 863        let pane_handle = workspace.active_pane().clone();
 864        let pane = pane_handle.read(cx);
 865        let active_item_id = pane.items[pane.active_item_index].id();
 866
 867        let task = Self::close_items_to_the_left_by_id(workspace, pane_handle, active_item_id, cx);
 868
 869        Some(cx.foreground().spawn(async move {
 870            task.await?;
 871            Ok(())
 872        }))
 873    }
 874
 875    pub fn close_items_to_the_left_by_id(
 876        workspace: &mut Workspace,
 877        pane: ViewHandle<Pane>,
 878        item_id: usize,
 879        cx: &mut ViewContext<Workspace>,
 880    ) -> Task<Result<()>> {
 881        let item_ids: Vec<_> = pane
 882            .read(cx)
 883            .items()
 884            .take_while(|item| item.id() != item_id)
 885            .map(|item| item.id())
 886            .collect();
 887
 888        let task = Self::close_items(workspace, pane, cx, move |item_id| {
 889            item_ids.contains(&item_id)
 890        });
 891
 892        cx.foreground().spawn(async move {
 893            task.await?;
 894            Ok(())
 895        })
 896    }
 897
 898    pub fn close_items_to_the_right(
 899        workspace: &mut Workspace,
 900        _: &CloseItemsToTheRight,
 901        cx: &mut ViewContext<Workspace>,
 902    ) -> Option<Task<Result<()>>> {
 903        let pane_handle = workspace.active_pane().clone();
 904        let pane = pane_handle.read(cx);
 905        let active_item_id = pane.items[pane.active_item_index].id();
 906
 907        let task = Self::close_items_to_the_right_by_id(workspace, pane_handle, active_item_id, cx);
 908
 909        Some(cx.foreground().spawn(async move {
 910            task.await?;
 911            Ok(())
 912        }))
 913    }
 914
 915    pub fn close_items_to_the_right_by_id(
 916        workspace: &mut Workspace,
 917        pane: ViewHandle<Pane>,
 918        item_id: usize,
 919        cx: &mut ViewContext<Workspace>,
 920    ) -> Task<Result<()>> {
 921        let item_ids: Vec<_> = pane
 922            .read(cx)
 923            .items()
 924            .rev()
 925            .take_while(|item| item.id() != item_id)
 926            .map(|item| item.id())
 927            .collect();
 928
 929        let task = Self::close_items(workspace, pane, cx, move |item_id| {
 930            item_ids.contains(&item_id)
 931        });
 932
 933        cx.foreground().spawn(async move {
 934            task.await?;
 935            Ok(())
 936        })
 937    }
 938
 939    pub fn close_all_items(
 940        workspace: &mut Workspace,
 941        _: &CloseAllItems,
 942        cx: &mut ViewContext<Workspace>,
 943    ) -> Option<Task<Result<()>>> {
 944        let pane_handle = workspace.active_pane().clone();
 945
 946        let task = Self::close_items(workspace, pane_handle, cx, move |_| true);
 947
 948        Some(cx.foreground().spawn(async move {
 949            task.await?;
 950            Ok(())
 951        }))
 952    }
 953
 954    pub fn close_items(
 955        workspace: &mut Workspace,
 956        pane: ViewHandle<Pane>,
 957        cx: &mut ViewContext<Workspace>,
 958        should_close: impl 'static + Fn(usize) -> bool,
 959    ) -> Task<Result<()>> {
 960        let project = workspace.project().clone();
 961
 962        // Find the items to close.
 963        let mut items_to_close = Vec::new();
 964        for item in &pane.read(cx).items {
 965            if should_close(item.id()) {
 966                items_to_close.push(item.boxed_clone());
 967            }
 968        }
 969
 970        // If a buffer is open both in a singleton editor and in a multibuffer, make sure
 971        // to focus the singleton buffer when prompting to save that buffer, as opposed
 972        // to focusing the multibuffer, because this gives the user a more clear idea
 973        // of what content they would be saving.
 974        items_to_close.sort_by_key(|item| !item.is_singleton(cx));
 975
 976        cx.spawn(|workspace, mut cx| async move {
 977            let mut saved_project_items_ids = HashSet::default();
 978            for item in items_to_close.clone() {
 979                // Find the item's current index and its set of project item models. Avoid
 980                // storing these in advance, in case they have changed since this task
 981                // was started.
 982                let (item_ix, mut project_item_ids) = pane.read_with(&cx, |pane, cx| {
 983                    (pane.index_for_item(&*item), item.project_item_model_ids(cx))
 984                })?;
 985                let item_ix = if let Some(ix) = item_ix {
 986                    ix
 987                } else {
 988                    continue;
 989                };
 990
 991                // Check if this view has any project items that are not open anywhere else
 992                // in the workspace, AND that the user has not already been prompted to save.
 993                // If there are any such project entries, prompt the user to save this item.
 994                workspace.read_with(&cx, |workspace, cx| {
 995                    for item in workspace.items(cx) {
 996                        if !items_to_close
 997                            .iter()
 998                            .any(|item_to_close| item_to_close.id() == item.id())
 999                        {
1000                            let other_project_item_ids = item.project_item_model_ids(cx);
1001                            project_item_ids.retain(|id| !other_project_item_ids.contains(id));
1002                        }
1003                    }
1004                })?;
1005                let should_save = project_item_ids
1006                    .iter()
1007                    .any(|id| saved_project_items_ids.insert(*id));
1008
1009                if should_save
1010                    && !Self::save_item(project.clone(), &pane, item_ix, &*item, true, &mut cx)
1011                        .await?
1012                {
1013                    break;
1014                }
1015
1016                // Remove the item from the pane.
1017                pane.update(&mut cx, |pane, cx| {
1018                    if let Some(item_ix) = pane.items.iter().position(|i| i.id() == item.id()) {
1019                        pane.remove_item(item_ix, false, cx);
1020                    }
1021                })?;
1022            }
1023
1024            pane.update(&mut cx, |_, cx| cx.notify())?;
1025            Ok(())
1026        })
1027    }
1028
1029    fn remove_item(&mut self, item_index: usize, activate_pane: bool, cx: &mut ViewContext<Self>) {
1030        self.activation_history
1031            .retain(|&history_entry| history_entry != self.items[item_index].id());
1032
1033        if item_index == self.active_item_index {
1034            let index_to_activate = self
1035                .activation_history
1036                .pop()
1037                .and_then(|last_activated_item| {
1038                    self.items.iter().enumerate().find_map(|(index, item)| {
1039                        (item.id() == last_activated_item).then_some(index)
1040                    })
1041                })
1042                // We didn't have a valid activation history entry, so fallback
1043                // to activating the item to the left
1044                .unwrap_or_else(|| item_index.min(self.items.len()).saturating_sub(1));
1045
1046            self.activate_item(index_to_activate, activate_pane, activate_pane, cx);
1047        }
1048
1049        let item = self.items.remove(item_index);
1050
1051        cx.emit(Event::RemoveItem { item_id: item.id() });
1052        if self.items.is_empty() {
1053            item.deactivated(cx);
1054            self.update_toolbar(cx);
1055            cx.emit(Event::Remove);
1056        }
1057
1058        if item_index < self.active_item_index {
1059            self.active_item_index -= 1;
1060        }
1061
1062        self.nav_history
1063            .borrow_mut()
1064            .set_mode(NavigationMode::ClosingItem);
1065        item.deactivated(cx);
1066        self.nav_history
1067            .borrow_mut()
1068            .set_mode(NavigationMode::Normal);
1069
1070        if let Some(path) = item.project_path(cx) {
1071            self.nav_history
1072                .borrow_mut()
1073                .paths_by_item
1074                .insert(item.id(), path);
1075        } else {
1076            self.nav_history
1077                .borrow_mut()
1078                .paths_by_item
1079                .remove(&item.id());
1080        }
1081
1082        cx.notify();
1083    }
1084
1085    pub async fn save_item(
1086        project: ModelHandle<Project>,
1087        pane: &ViewHandle<Pane>,
1088        item_ix: usize,
1089        item: &dyn ItemHandle,
1090        should_prompt_for_save: bool,
1091        cx: &mut AsyncAppContext,
1092    ) -> Result<bool> {
1093        const CONFLICT_MESSAGE: &str =
1094            "This file has changed on disk since you started editing it. Do you want to overwrite it?";
1095        const DIRTY_MESSAGE: &str = "This file contains unsaved edits. Do you want to save it?";
1096
1097        let (has_conflict, is_dirty, can_save, is_singleton) = cx.read(|cx| {
1098            (
1099                item.has_conflict(cx),
1100                item.is_dirty(cx),
1101                item.can_save(cx),
1102                item.is_singleton(cx),
1103            )
1104        });
1105
1106        if has_conflict && can_save {
1107            let mut answer = pane.update(cx, |pane, cx| {
1108                pane.activate_item(item_ix, true, true, cx);
1109                cx.prompt(
1110                    PromptLevel::Warning,
1111                    CONFLICT_MESSAGE,
1112                    &["Overwrite", "Discard", "Cancel"],
1113                )
1114            })?;
1115            match answer.next().await {
1116                Some(0) => pane.update(cx, |_, cx| item.save(project, cx))?.await?,
1117                Some(1) => pane.update(cx, |_, cx| item.reload(project, cx))?.await?,
1118                _ => return Ok(false),
1119            }
1120        } else if is_dirty && (can_save || is_singleton) {
1121            let will_autosave = cx.read(|cx| {
1122                matches!(
1123                    cx.global::<Settings>().autosave,
1124                    Autosave::OnFocusChange | Autosave::OnWindowChange
1125                ) && Self::can_autosave_item(&*item, cx)
1126            });
1127            let should_save = if should_prompt_for_save && !will_autosave {
1128                let mut answer = pane.update(cx, |pane, cx| {
1129                    pane.activate_item(item_ix, true, true, cx);
1130                    cx.prompt(
1131                        PromptLevel::Warning,
1132                        DIRTY_MESSAGE,
1133                        &["Save", "Don't Save", "Cancel"],
1134                    )
1135                })?;
1136                match answer.next().await {
1137                    Some(0) => true,
1138                    Some(1) => false,
1139                    _ => return Ok(false),
1140                }
1141            } else {
1142                true
1143            };
1144
1145            if should_save {
1146                if can_save {
1147                    pane.update(cx, |_, cx| item.save(project, cx))?.await?;
1148                } else if is_singleton {
1149                    let start_abs_path = project
1150                        .read_with(cx, |project, cx| {
1151                            let worktree = project.visible_worktrees(cx).next()?;
1152                            Some(worktree.read(cx).as_local()?.abs_path().to_path_buf())
1153                        })
1154                        .unwrap_or_else(|| Path::new("").into());
1155
1156                    let mut abs_path = cx.update(|cx| cx.prompt_for_new_path(&start_abs_path));
1157                    if let Some(abs_path) = abs_path.next().await.flatten() {
1158                        pane.update(cx, |_, cx| item.save_as(project, abs_path, cx))?
1159                            .await?;
1160                    } else {
1161                        return Ok(false);
1162                    }
1163                }
1164            }
1165        }
1166        Ok(true)
1167    }
1168
1169    fn can_autosave_item(item: &dyn ItemHandle, cx: &AppContext) -> bool {
1170        let is_deleted = item.project_entry_ids(cx).is_empty();
1171        item.is_dirty(cx) && !item.has_conflict(cx) && item.can_save(cx) && !is_deleted
1172    }
1173
1174    pub fn autosave_item(
1175        item: &dyn ItemHandle,
1176        project: ModelHandle<Project>,
1177        cx: &mut WindowContext,
1178    ) -> Task<Result<()>> {
1179        if Self::can_autosave_item(item, cx) {
1180            item.save(project, cx)
1181        } else {
1182            Task::ready(Ok(()))
1183        }
1184    }
1185
1186    pub fn focus_active_item(&mut self, cx: &mut ViewContext<Self>) {
1187        if let Some(active_item) = self.active_item() {
1188            cx.focus(active_item.as_any());
1189        }
1190    }
1191
1192    pub fn move_item(
1193        workspace: &mut Workspace,
1194        from: ViewHandle<Pane>,
1195        to: ViewHandle<Pane>,
1196        item_id_to_move: usize,
1197        destination_index: usize,
1198        cx: &mut ViewContext<Workspace>,
1199    ) {
1200        let item_to_move = from
1201            .read(cx)
1202            .items()
1203            .enumerate()
1204            .find(|(_, item_handle)| item_handle.id() == item_id_to_move);
1205
1206        if item_to_move.is_none() {
1207            log::warn!("Tried to move item handle which was not in `from` pane. Maybe tab was closed during drop");
1208            return;
1209        }
1210        let (item_ix, item_handle) = item_to_move.unwrap();
1211        let item_handle = item_handle.clone();
1212
1213        if from != to {
1214            // Close item from previous pane
1215            from.update(cx, |from, cx| {
1216                from.remove_item(item_ix, false, cx);
1217            });
1218        }
1219
1220        // This automatically removes duplicate items in the pane
1221        Pane::add_item(
1222            workspace,
1223            &to,
1224            item_handle,
1225            true,
1226            true,
1227            Some(destination_index),
1228            cx,
1229        );
1230
1231        cx.focus(&to);
1232    }
1233
1234    pub fn split(&mut self, direction: SplitDirection, cx: &mut ViewContext<Self>) {
1235        cx.emit(Event::Split(direction));
1236    }
1237
1238    fn deploy_split_menu(&mut self, _: &DeploySplitMenu, cx: &mut ViewContext<Self>) {
1239        self.tab_bar_context_menu.handle.update(cx, |menu, cx| {
1240            menu.show(
1241                Default::default(),
1242                AnchorCorner::TopRight,
1243                vec![
1244                    ContextMenuItem::item("Split Right", SplitRight),
1245                    ContextMenuItem::item("Split Left", SplitLeft),
1246                    ContextMenuItem::item("Split Up", SplitUp),
1247                    ContextMenuItem::item("Split Down", SplitDown),
1248                ],
1249                cx,
1250            );
1251        });
1252
1253        self.tab_bar_context_menu.kind = TabBarContextMenuKind::Split;
1254    }
1255
1256    fn deploy_dock_menu(&mut self, _: &DeployDockMenu, cx: &mut ViewContext<Self>) {
1257        self.tab_bar_context_menu.handle.update(cx, |menu, cx| {
1258            menu.show(
1259                Default::default(),
1260                AnchorCorner::TopRight,
1261                vec![
1262                    ContextMenuItem::item("Anchor Dock Right", AnchorDockRight),
1263                    ContextMenuItem::item("Anchor Dock Bottom", AnchorDockBottom),
1264                    ContextMenuItem::item("Expand Dock", ExpandDock),
1265                ],
1266                cx,
1267            );
1268        });
1269
1270        self.tab_bar_context_menu.kind = TabBarContextMenuKind::Dock;
1271    }
1272
1273    fn deploy_new_menu(&mut self, _: &DeployNewMenu, cx: &mut ViewContext<Self>) {
1274        self.tab_bar_context_menu.handle.update(cx, |menu, cx| {
1275            menu.show(
1276                Default::default(),
1277                AnchorCorner::TopRight,
1278                vec![
1279                    ContextMenuItem::item("New File", NewFile),
1280                    ContextMenuItem::item("New Terminal", NewTerminal),
1281                    ContextMenuItem::item("New Search", NewSearch),
1282                ],
1283                cx,
1284            );
1285        });
1286
1287        self.tab_bar_context_menu.kind = TabBarContextMenuKind::New;
1288    }
1289
1290    fn deploy_tab_context_menu(
1291        &mut self,
1292        action: &DeployTabContextMenu,
1293        cx: &mut ViewContext<Self>,
1294    ) {
1295        let target_item_id = action.item_id;
1296        let target_pane = action.pane.clone();
1297        let active_item_id = self.items[self.active_item_index].id();
1298        let is_active_item = target_item_id == active_item_id;
1299
1300        // The `CloseInactiveItems` action should really be called "CloseOthers" and the behaviour should be dynamically based on the tab the action is ran on.  Currenlty, 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
1301
1302        self.tab_context_menu.update(cx, |menu, cx| {
1303            menu.show(
1304                action.position,
1305                AnchorCorner::TopLeft,
1306                if is_active_item {
1307                    vec![
1308                        ContextMenuItem::item("Close Active Item", CloseActiveItem),
1309                        ContextMenuItem::item("Close Inactive Items", CloseInactiveItems),
1310                        ContextMenuItem::item("Close Clean Items", CloseCleanItems),
1311                        ContextMenuItem::item("Close Items To The Left", CloseItemsToTheLeft),
1312                        ContextMenuItem::item("Close Items To The Right", CloseItemsToTheRight),
1313                        ContextMenuItem::item("Close All Items", CloseAllItems),
1314                    ]
1315                } else {
1316                    // 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.
1317                    vec![
1318                        ContextMenuItem::item(
1319                            "Close Inactive Item",
1320                            CloseItemById {
1321                                item_id: target_item_id,
1322                                pane: target_pane.clone(),
1323                            },
1324                        ),
1325                        ContextMenuItem::item("Close Inactive Items", CloseInactiveItems),
1326                        ContextMenuItem::item("Close Clean Items", CloseCleanItems),
1327                        ContextMenuItem::item(
1328                            "Close Items To The Left",
1329                            CloseItemsToTheLeftById {
1330                                item_id: target_item_id,
1331                                pane: target_pane.clone(),
1332                            },
1333                        ),
1334                        ContextMenuItem::item(
1335                            "Close Items To The Right",
1336                            CloseItemsToTheRightById {
1337                                item_id: target_item_id,
1338                                pane: target_pane.clone(),
1339                            },
1340                        ),
1341                        ContextMenuItem::item("Close All Items", CloseAllItems),
1342                    ]
1343                },
1344                cx,
1345            );
1346        });
1347    }
1348
1349    pub fn toolbar(&self) -> &ViewHandle<Toolbar> {
1350        &self.toolbar
1351    }
1352
1353    fn update_toolbar(&mut self, cx: &mut ViewContext<Self>) {
1354        let active_item = self
1355            .items
1356            .get(self.active_item_index)
1357            .map(|item| item.as_ref());
1358        self.toolbar.update(cx, |toolbar, cx| {
1359            toolbar.set_active_pane_item(active_item, cx);
1360        });
1361    }
1362
1363    fn render_tabs(&mut self, cx: &mut ViewContext<Self>) -> impl Element<Self> {
1364        let theme = cx.global::<Settings>().theme.clone();
1365
1366        let pane = cx.handle().downgrade();
1367        let autoscroll = if mem::take(&mut self.autoscroll) {
1368            Some(self.active_item_index)
1369        } else {
1370            None
1371        };
1372
1373        let pane_active = self.is_active;
1374
1375        enum Tabs {}
1376        let mut row = Flex::row().scrollable::<Tabs>(1, autoscroll, cx);
1377        for (ix, (item, detail)) in self
1378            .items
1379            .iter()
1380            .cloned()
1381            .zip(self.tab_details(cx))
1382            .enumerate()
1383        {
1384            let detail = if detail == 0 { None } else { Some(detail) };
1385            let tab_active = ix == self.active_item_index;
1386
1387            row.add_child({
1388                enum TabDragReceiver {}
1389                let mut receiver =
1390                    dragged_item_receiver::<TabDragReceiver, _, _>(ix, ix, true, None, cx, {
1391                        let item = item.clone();
1392                        let pane = pane.clone();
1393                        let detail = detail.clone();
1394
1395                        let theme = cx.global::<Settings>().theme.clone();
1396                        let mut tooltip_theme = theme.tooltip.clone();
1397                        tooltip_theme.max_text_width = None;
1398                        let tab_tooltip_text = item.tab_tooltip_text(cx).map(|a| a.to_string());
1399
1400                        move |mouse_state, cx| {
1401                            let tab_style =
1402                                theme.workspace.tab_bar.tab_style(pane_active, tab_active);
1403                            let hovered = mouse_state.hovered();
1404
1405                            enum Tab {}
1406                            let mouse_event_handler =
1407                                MouseEventHandler::<Tab, Pane>::new(ix, cx, |_, cx| {
1408                                    Self::render_tab(
1409                                        &item,
1410                                        pane.clone(),
1411                                        ix == 0,
1412                                        detail,
1413                                        hovered,
1414                                        tab_style,
1415                                        cx,
1416                                    )
1417                                })
1418                                .on_down(MouseButton::Left, move |_, _, cx| {
1419                                    cx.dispatch_action(ActivateItem(ix));
1420                                })
1421                                .on_click(MouseButton::Middle, {
1422                                    let item = item.clone();
1423                                    let pane = pane.clone();
1424                                    move |_, _, cx| {
1425                                        cx.dispatch_action(CloseItemById {
1426                                            item_id: item.id(),
1427                                            pane: pane.clone(),
1428                                        })
1429                                    }
1430                                })
1431                                .on_down(
1432                                    MouseButton::Right,
1433                                    move |e, _, cx| {
1434                                        let item = item.clone();
1435                                        cx.dispatch_action(DeployTabContextMenu {
1436                                            position: e.position,
1437                                            item_id: item.id(),
1438                                            pane: pane.clone(),
1439                                        });
1440                                    },
1441                                );
1442
1443                            if let Some(tab_tooltip_text) = tab_tooltip_text {
1444                                mouse_event_handler
1445                                    .with_tooltip::<Self>(
1446                                        ix,
1447                                        tab_tooltip_text,
1448                                        None,
1449                                        tooltip_theme,
1450                                        cx,
1451                                    )
1452                                    .into_any()
1453                            } else {
1454                                mouse_event_handler.into_any()
1455                            }
1456                        }
1457                    });
1458
1459                if !pane_active || !tab_active {
1460                    receiver = receiver.with_cursor_style(CursorStyle::PointingHand);
1461                }
1462
1463                receiver.as_draggable(
1464                    DraggedItem {
1465                        item,
1466                        pane: pane.clone(),
1467                    },
1468                    {
1469                        let theme = cx.global::<Settings>().theme.clone();
1470
1471                        let detail = detail.clone();
1472                        move |dragged_item: &DraggedItem, cx: &mut ViewContext<Workspace>| {
1473                            let tab_style = &theme.workspace.tab_bar.dragged_tab;
1474                            Self::render_dragged_tab(
1475                                &dragged_item.item,
1476                                dragged_item.pane.clone(),
1477                                false,
1478                                detail,
1479                                false,
1480                                &tab_style,
1481                                cx,
1482                            )
1483                        }
1484                    },
1485                )
1486            })
1487        }
1488
1489        // Use the inactive tab style along with the current pane's active status to decide how to render
1490        // the filler
1491        let filler_index = self.items.len();
1492        let filler_style = theme.workspace.tab_bar.tab_style(pane_active, false);
1493        enum Filler {}
1494        row.add_child(
1495            dragged_item_receiver::<Filler, _, _>(0, filler_index, true, None, cx, |_, _| {
1496                Empty::new()
1497                    .contained()
1498                    .with_style(filler_style.container)
1499                    .with_border(filler_style.container.border)
1500            })
1501            .flex(1., true)
1502            .into_any_named("filler"),
1503        );
1504
1505        row
1506    }
1507
1508    fn tab_details(&self, cx: &AppContext) -> Vec<usize> {
1509        let mut tab_details = (0..self.items.len()).map(|_| 0).collect::<Vec<_>>();
1510
1511        let mut tab_descriptions = HashMap::default();
1512        let mut done = false;
1513        while !done {
1514            done = true;
1515
1516            // Store item indices by their tab description.
1517            for (ix, (item, detail)) in self.items.iter().zip(&tab_details).enumerate() {
1518                if let Some(description) = item.tab_description(*detail, cx) {
1519                    if *detail == 0
1520                        || Some(&description) != item.tab_description(detail - 1, cx).as_ref()
1521                    {
1522                        tab_descriptions
1523                            .entry(description)
1524                            .or_insert(Vec::new())
1525                            .push(ix);
1526                    }
1527                }
1528            }
1529
1530            // If two or more items have the same tab description, increase their level
1531            // of detail and try again.
1532            for (_, item_ixs) in tab_descriptions.drain() {
1533                if item_ixs.len() > 1 {
1534                    done = false;
1535                    for ix in item_ixs {
1536                        tab_details[ix] += 1;
1537                    }
1538                }
1539            }
1540        }
1541
1542        tab_details
1543    }
1544
1545    fn render_tab(
1546        item: &Box<dyn ItemHandle>,
1547        pane: WeakViewHandle<Pane>,
1548        first: bool,
1549        detail: Option<usize>,
1550        hovered: bool,
1551        tab_style: &theme::Tab,
1552        cx: &mut ViewContext<Self>,
1553    ) -> AnyElement<Self> {
1554        let title = item.tab_content(detail, &tab_style, cx);
1555        Self::render_tab_with_title(title, item, pane, first, hovered, tab_style, cx)
1556    }
1557
1558    fn render_dragged_tab(
1559        item: &Box<dyn ItemHandle>,
1560        pane: WeakViewHandle<Pane>,
1561        first: bool,
1562        detail: Option<usize>,
1563        hovered: bool,
1564        tab_style: &theme::Tab,
1565        cx: &mut ViewContext<Workspace>,
1566    ) -> AnyElement<Workspace> {
1567        let title = item.dragged_tab_content(detail, &tab_style, cx);
1568        Self::render_tab_with_title(title, item, pane, first, hovered, tab_style, cx)
1569    }
1570
1571    fn render_tab_with_title<T: View>(
1572        title: AnyElement<T>,
1573        item: &Box<dyn ItemHandle>,
1574        pane: WeakViewHandle<Pane>,
1575        first: bool,
1576        hovered: bool,
1577        tab_style: &theme::Tab,
1578        cx: &mut ViewContext<T>,
1579    ) -> AnyElement<T> {
1580        let mut container = tab_style.container.clone();
1581        if first {
1582            container.border.left = false;
1583        }
1584
1585        Flex::row()
1586            .with_child({
1587                let diameter = 7.0;
1588                let icon_color = if item.has_conflict(cx) {
1589                    Some(tab_style.icon_conflict)
1590                } else if item.is_dirty(cx) {
1591                    Some(tab_style.icon_dirty)
1592                } else {
1593                    None
1594                };
1595
1596                Canvas::new(move |scene, bounds, _, _, _| {
1597                    if let Some(color) = icon_color {
1598                        let square = RectF::new(bounds.origin(), vec2f(diameter, diameter));
1599                        scene.push_quad(Quad {
1600                            bounds: square,
1601                            background: Some(color),
1602                            border: Default::default(),
1603                            corner_radius: diameter / 2.,
1604                        });
1605                    }
1606                })
1607                .constrained()
1608                .with_width(diameter)
1609                .with_height(diameter)
1610                .aligned()
1611            })
1612            .with_child(title.aligned().contained().with_style(ContainerStyle {
1613                margin: Margin {
1614                    left: tab_style.spacing,
1615                    right: tab_style.spacing,
1616                    ..Default::default()
1617                },
1618                ..Default::default()
1619            }))
1620            .with_child(
1621                if hovered {
1622                    let item_id = item.id();
1623                    enum TabCloseButton {}
1624                    let icon = Svg::new("icons/x_mark_8.svg");
1625                    MouseEventHandler::<TabCloseButton, _>::new(item_id, cx, |mouse_state, _| {
1626                        if mouse_state.hovered() {
1627                            icon.with_color(tab_style.icon_close_active)
1628                        } else {
1629                            icon.with_color(tab_style.icon_close)
1630                        }
1631                    })
1632                    .with_padding(Padding::uniform(4.))
1633                    .with_cursor_style(CursorStyle::PointingHand)
1634                    .on_click(MouseButton::Left, {
1635                        let pane = pane.clone();
1636                        move |_, _, cx| {
1637                            cx.dispatch_action(CloseItemById {
1638                                item_id,
1639                                pane: pane.clone(),
1640                            })
1641                        }
1642                    })
1643                    .into_any_named("close-tab-icon")
1644                    .constrained()
1645                } else {
1646                    Empty::new().constrained()
1647                }
1648                .with_width(tab_style.close_icon_width)
1649                .aligned(),
1650            )
1651            .contained()
1652            .with_style(container)
1653            .constrained()
1654            .with_height(tab_style.height)
1655            .into_any()
1656    }
1657
1658    fn render_tab_bar_buttons(
1659        &mut self,
1660        theme: &Theme,
1661        cx: &mut ViewContext<Self>,
1662    ) -> AnyElement<Self> {
1663        Flex::row()
1664            // New menu
1665            .with_child(render_tab_bar_button(
1666                0,
1667                "icons/plus_12.svg",
1668                cx,
1669                DeployNewMenu,
1670                self.tab_bar_context_menu
1671                    .handle_if_kind(TabBarContextMenuKind::New),
1672            ))
1673            .with_child(
1674                self.docked
1675                    .map(|anchor| {
1676                        // Add the dock menu button if this pane is a dock
1677                        let dock_icon = icon_for_dock_anchor(anchor);
1678
1679                        render_tab_bar_button(
1680                            1,
1681                            dock_icon,
1682                            cx,
1683                            DeployDockMenu,
1684                            self.tab_bar_context_menu
1685                                .handle_if_kind(TabBarContextMenuKind::Dock),
1686                        )
1687                    })
1688                    .unwrap_or_else(|| {
1689                        // Add the split menu if this pane is not a dock
1690                        render_tab_bar_button(
1691                            2,
1692                            "icons/split_12.svg",
1693                            cx,
1694                            DeploySplitMenu,
1695                            self.tab_bar_context_menu
1696                                .handle_if_kind(TabBarContextMenuKind::Split),
1697                        )
1698                    }),
1699            )
1700            // Add the close dock button if this pane is a dock
1701            .with_children(
1702                self.docked
1703                    .map(|_| render_tab_bar_button(3, "icons/x_mark_8.svg", cx, HideDock, None)),
1704            )
1705            .contained()
1706            .with_style(theme.workspace.tab_bar.pane_button_container)
1707            .flex(1., false)
1708            .into_any()
1709    }
1710
1711    fn render_blank_pane(
1712        &mut self,
1713        theme: &Theme,
1714        _cx: &mut ViewContext<Self>,
1715    ) -> AnyElement<Self> {
1716        let background = theme.workspace.background;
1717        Empty::new()
1718            .contained()
1719            .with_background_color(background)
1720            .into_any()
1721    }
1722}
1723
1724impl Entity for Pane {
1725    type Event = Event;
1726}
1727
1728impl View for Pane {
1729    fn ui_name() -> &'static str {
1730        "Pane"
1731    }
1732
1733    fn render(&mut self, cx: &mut ViewContext<Self>) -> AnyElement<Self> {
1734        enum MouseNavigationHandler {}
1735
1736        MouseEventHandler::<MouseNavigationHandler, _>::new(0, cx, |_, cx| {
1737            let active_item_index = self.active_item_index;
1738
1739            if let Some(active_item) = self.active_item() {
1740                Flex::column()
1741                    .with_child({
1742                        let theme = cx.global::<Settings>().theme.clone();
1743
1744                        let mut stack = Stack::new();
1745
1746                        enum TabBarEventHandler {}
1747                        stack.add_child(
1748                            MouseEventHandler::<TabBarEventHandler, _>::new(0, cx, |_, _| {
1749                                Empty::new()
1750                                    .contained()
1751                                    .with_style(theme.workspace.tab_bar.container)
1752                            })
1753                            .on_down(
1754                                MouseButton::Left,
1755                                move |_, _, cx| {
1756                                    cx.dispatch_action(ActivateItem(active_item_index));
1757                                },
1758                            ),
1759                        );
1760
1761                        let mut tab_row = Flex::row()
1762                            .with_child(self.render_tabs(cx).flex(1., true).into_any_named("tabs"));
1763
1764                        if self.is_active {
1765                            tab_row.add_child(self.render_tab_bar_buttons(&theme, cx))
1766                        }
1767
1768                        stack.add_child(tab_row);
1769                        stack
1770                            .constrained()
1771                            .with_height(theme.workspace.tab_bar.height)
1772                            .flex(1., false)
1773                            .into_any_named("tab bar")
1774                    })
1775                    .with_child({
1776                        enum PaneContentTabDropTarget {}
1777                        dragged_item_receiver::<PaneContentTabDropTarget, _, _>(
1778                            0,
1779                            self.active_item_index + 1,
1780                            false,
1781                            if self.docked.is_some() {
1782                                None
1783                            } else {
1784                                Some(100.)
1785                            },
1786                            cx,
1787                            {
1788                                let toolbar = self.toolbar.clone();
1789                                let toolbar_hidden = toolbar.read(cx).hidden();
1790                                move |_, cx| {
1791                                    Flex::column()
1792                                        .with_children(
1793                                            (!toolbar_hidden)
1794                                                .then(|| ChildView::new(&toolbar, cx).expanded()),
1795                                        )
1796                                        .with_child(
1797                                            ChildView::new(active_item.as_any(), cx).flex(1., true),
1798                                        )
1799                                }
1800                            },
1801                        )
1802                        .flex(1., true)
1803                    })
1804                    .with_child(ChildView::new(&self.tab_context_menu, cx))
1805                    .into_any()
1806            } else {
1807                enum EmptyPane {}
1808                let theme = cx.global::<Settings>().theme.clone();
1809
1810                dragged_item_receiver::<EmptyPane, _, _>(0, 0, false, None, cx, |_, cx| {
1811                    self.render_blank_pane(&theme, cx)
1812                })
1813                .on_down(MouseButton::Left, |_, _, cx| {
1814                    cx.focus_parent_view();
1815                })
1816                .into_any()
1817            }
1818        })
1819        .on_down(
1820            MouseButton::Navigate(NavigationDirection::Back),
1821            move |_, _, cx| {
1822                let pane = cx.weak_handle();
1823                cx.dispatch_action(GoBack { pane: Some(pane) });
1824            },
1825        )
1826        .on_down(MouseButton::Navigate(NavigationDirection::Forward), {
1827            move |_, _, cx| {
1828                let pane = cx.weak_handle();
1829                cx.dispatch_action(GoForward { pane: Some(pane) })
1830            }
1831        })
1832        .into_any_named("pane")
1833    }
1834
1835    fn focus_in(&mut self, focused: AnyViewHandle, cx: &mut ViewContext<Self>) {
1836        self.toolbar.update(cx, |toolbar, cx| {
1837            toolbar.pane_focus_update(true, cx);
1838        });
1839
1840        if let Some(active_item) = self.active_item() {
1841            if cx.is_self_focused() {
1842                // Pane was focused directly. We need to either focus a view inside the active item,
1843                // or focus the active item itself
1844                if let Some(weak_last_focused_view) =
1845                    self.last_focused_view_by_item.get(&active_item.id())
1846                {
1847                    if let Some(last_focused_view) = weak_last_focused_view.upgrade(cx) {
1848                        cx.focus(&last_focused_view);
1849                        return;
1850                    } else {
1851                        self.last_focused_view_by_item.remove(&active_item.id());
1852                    }
1853                }
1854
1855                cx.focus(active_item.as_any());
1856            } else if focused != self.tab_bar_context_menu.handle {
1857                self.last_focused_view_by_item
1858                    .insert(active_item.id(), focused.downgrade());
1859            }
1860        }
1861    }
1862
1863    fn focus_out(&mut self, _: AnyViewHandle, cx: &mut ViewContext<Self>) {
1864        self.toolbar.update(cx, |toolbar, cx| {
1865            toolbar.pane_focus_update(false, cx);
1866        });
1867    }
1868
1869    fn keymap_context(&self, _: &AppContext) -> KeymapContext {
1870        let mut keymap = Self::default_keymap_context();
1871        if self.docked.is_some() {
1872            keymap.add_identifier("docked");
1873        }
1874        keymap
1875    }
1876}
1877
1878fn render_tab_bar_button<A: Action + Clone>(
1879    index: usize,
1880    icon: &'static str,
1881    cx: &mut ViewContext<Pane>,
1882    action: A,
1883    context_menu: Option<ViewHandle<ContextMenu>>,
1884) -> AnyElement<Pane> {
1885    enum TabBarButton {}
1886
1887    Stack::new()
1888        .with_child(
1889            MouseEventHandler::<TabBarButton, _>::new(index, cx, |mouse_state, cx| {
1890                let theme = &cx.global::<Settings>().theme.workspace.tab_bar;
1891                let style = theme.pane_button.style_for(mouse_state, false);
1892                Svg::new(icon)
1893                    .with_color(style.color)
1894                    .constrained()
1895                    .with_width(style.icon_width)
1896                    .aligned()
1897                    .constrained()
1898                    .with_width(style.button_width)
1899                    .with_height(style.button_width)
1900            })
1901            .with_cursor_style(CursorStyle::PointingHand)
1902            .on_click(MouseButton::Left, move |_, _, cx| {
1903                cx.dispatch_action(action.clone());
1904            }),
1905        )
1906        .with_children(
1907            context_menu.map(|menu| ChildView::new(&menu, cx).aligned().bottom().right()),
1908        )
1909        .flex(1., false)
1910        .into_any_named("tab bar button")
1911}
1912
1913impl ItemNavHistory {
1914    pub fn push<D: 'static + Any>(&self, data: Option<D>, cx: &mut WindowContext) {
1915        self.history.borrow_mut().push(data, self.item.clone(), cx);
1916    }
1917
1918    pub fn pop_backward(&self, cx: &mut WindowContext) -> Option<NavigationEntry> {
1919        self.history.borrow_mut().pop(NavigationMode::GoingBack, cx)
1920    }
1921
1922    pub fn pop_forward(&self, cx: &mut WindowContext) -> Option<NavigationEntry> {
1923        self.history
1924            .borrow_mut()
1925            .pop(NavigationMode::GoingForward, cx)
1926    }
1927}
1928
1929impl NavHistory {
1930    fn set_mode(&mut self, mode: NavigationMode) {
1931        self.mode = mode;
1932    }
1933
1934    fn disable(&mut self) {
1935        self.mode = NavigationMode::Disabled;
1936    }
1937
1938    fn enable(&mut self) {
1939        self.mode = NavigationMode::Normal;
1940    }
1941
1942    fn pop(&mut self, mode: NavigationMode, cx: &mut WindowContext) -> Option<NavigationEntry> {
1943        let entry = match mode {
1944            NavigationMode::Normal | NavigationMode::Disabled | NavigationMode::ClosingItem => {
1945                return None
1946            }
1947            NavigationMode::GoingBack => &mut self.backward_stack,
1948            NavigationMode::GoingForward => &mut self.forward_stack,
1949            NavigationMode::ReopeningClosedItem => &mut self.closed_stack,
1950        }
1951        .pop_back();
1952        if entry.is_some() {
1953            self.did_update(cx);
1954        }
1955        entry
1956    }
1957
1958    fn push<D: 'static + Any>(
1959        &mut self,
1960        data: Option<D>,
1961        item: Rc<dyn WeakItemHandle>,
1962        cx: &mut WindowContext,
1963    ) {
1964        match self.mode {
1965            NavigationMode::Disabled => {}
1966            NavigationMode::Normal | NavigationMode::ReopeningClosedItem => {
1967                if self.backward_stack.len() >= MAX_NAVIGATION_HISTORY_LEN {
1968                    self.backward_stack.pop_front();
1969                }
1970                self.backward_stack.push_back(NavigationEntry {
1971                    item,
1972                    data: data.map(|data| Box::new(data) as Box<dyn Any>),
1973                });
1974                self.forward_stack.clear();
1975            }
1976            NavigationMode::GoingBack => {
1977                if self.forward_stack.len() >= MAX_NAVIGATION_HISTORY_LEN {
1978                    self.forward_stack.pop_front();
1979                }
1980                self.forward_stack.push_back(NavigationEntry {
1981                    item,
1982                    data: data.map(|data| Box::new(data) as Box<dyn Any>),
1983                });
1984            }
1985            NavigationMode::GoingForward => {
1986                if self.backward_stack.len() >= MAX_NAVIGATION_HISTORY_LEN {
1987                    self.backward_stack.pop_front();
1988                }
1989                self.backward_stack.push_back(NavigationEntry {
1990                    item,
1991                    data: data.map(|data| Box::new(data) as Box<dyn Any>),
1992                });
1993            }
1994            NavigationMode::ClosingItem => {
1995                if self.closed_stack.len() >= MAX_NAVIGATION_HISTORY_LEN {
1996                    self.closed_stack.pop_front();
1997                }
1998                self.closed_stack.push_back(NavigationEntry {
1999                    item,
2000                    data: data.map(|data| Box::new(data) as Box<dyn Any>),
2001                });
2002            }
2003        }
2004        self.did_update(cx);
2005    }
2006
2007    fn did_update(&self, cx: &mut WindowContext) {
2008        if let Some(pane) = self.pane.upgrade(cx) {
2009            cx.defer(move |cx| {
2010                pane.update(cx, |pane, cx| pane.history_updated(cx));
2011            });
2012        }
2013    }
2014}
2015
2016pub struct PaneBackdrop<V: View> {
2017    child_view: usize,
2018    child: AnyElement<V>,
2019}
2020
2021impl<V: View> PaneBackdrop<V> {
2022    pub fn new(pane_item_view: usize, child: AnyElement<V>) -> Self {
2023        PaneBackdrop {
2024            child,
2025            child_view: pane_item_view,
2026        }
2027    }
2028}
2029
2030impl<V: View> Element<V> for PaneBackdrop<V> {
2031    type LayoutState = ();
2032
2033    type PaintState = ();
2034
2035    fn layout(
2036        &mut self,
2037        constraint: gpui::SizeConstraint,
2038        view: &mut V,
2039        cx: &mut ViewContext<V>,
2040    ) -> (Vector2F, Self::LayoutState) {
2041        let size = self.child.layout(constraint, view, cx);
2042        (size, ())
2043    }
2044
2045    fn paint(
2046        &mut self,
2047        scene: &mut gpui::SceneBuilder,
2048        bounds: RectF,
2049        visible_bounds: RectF,
2050        _: &mut Self::LayoutState,
2051        view: &mut V,
2052        cx: &mut ViewContext<V>,
2053    ) -> Self::PaintState {
2054        let background = cx.global::<Settings>().theme.editor.background;
2055
2056        let visible_bounds = bounds.intersection(visible_bounds).unwrap_or_default();
2057
2058        scene.push_quad(gpui::Quad {
2059            bounds: RectF::new(bounds.origin(), bounds.size()),
2060            background: Some(background),
2061            ..Default::default()
2062        });
2063
2064        let child_view_id = self.child_view;
2065        scene.push_mouse_region(
2066            MouseRegion::new::<Self>(child_view_id, 0, visible_bounds).on_down(
2067                gpui::platform::MouseButton::Left,
2068                move |_, _: &mut V, cx| {
2069                    let window_id = cx.window_id();
2070                    cx.app_context().focus(window_id, Some(child_view_id))
2071                },
2072            ),
2073        );
2074
2075        scene.paint_layer(Some(bounds), |scene| {
2076            self.child
2077                .paint(scene, bounds.origin(), visible_bounds, view, cx)
2078        })
2079    }
2080
2081    fn rect_for_text_range(
2082        &self,
2083        range_utf16: std::ops::Range<usize>,
2084        _bounds: RectF,
2085        _visible_bounds: RectF,
2086        _layout: &Self::LayoutState,
2087        _paint: &Self::PaintState,
2088        view: &V,
2089        cx: &gpui::ViewContext<V>,
2090    ) -> Option<RectF> {
2091        self.child.rect_for_text_range(range_utf16, view, cx)
2092    }
2093
2094    fn debug(
2095        &self,
2096        _bounds: RectF,
2097        _layout: &Self::LayoutState,
2098        _paint: &Self::PaintState,
2099        view: &V,
2100        cx: &gpui::ViewContext<V>,
2101    ) -> serde_json::Value {
2102        gpui::json::json!({
2103            "type": "Pane Back Drop",
2104            "view": self.child_view,
2105            "child": self.child.debug(view, cx),
2106        })
2107    }
2108}
2109
2110#[cfg(test)]
2111mod tests {
2112    use std::sync::Arc;
2113
2114    use super::*;
2115    use crate::item::test::{TestItem, TestProjectItem};
2116    use gpui::{executor::Deterministic, TestAppContext};
2117    use project::FakeFs;
2118
2119    #[gpui::test]
2120    async fn test_remove_active_empty(cx: &mut TestAppContext) {
2121        Settings::test_async(cx);
2122        let fs = FakeFs::new(cx.background());
2123
2124        let project = Project::test(fs, None, cx).await;
2125        let (_, workspace) = cx.add_window(|cx| Workspace::test_new(project.clone(), cx));
2126
2127        workspace.update(cx, |workspace, cx| {
2128            assert!(Pane::close_active_item(workspace, &CloseActiveItem, cx).is_none())
2129        });
2130    }
2131
2132    #[gpui::test]
2133    async fn test_add_item_with_new_item(cx: &mut TestAppContext) {
2134        cx.foreground().forbid_parking();
2135        Settings::test_async(cx);
2136        let fs = FakeFs::new(cx.background());
2137
2138        let project = Project::test(fs, None, cx).await;
2139        let (_, workspace) = cx.add_window(|cx| Workspace::test_new(project.clone(), cx));
2140        let pane = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
2141
2142        // 1. Add with a destination index
2143        //   a. Add before the active item
2144        set_labeled_items(&workspace, &pane, ["A", "B*", "C"], cx);
2145        workspace.update(cx, |workspace, cx| {
2146            Pane::add_item(
2147                workspace,
2148                &pane,
2149                Box::new(cx.add_view(|_| TestItem::new().with_label("D"))),
2150                false,
2151                false,
2152                Some(0),
2153                cx,
2154            );
2155        });
2156        assert_item_labels(&pane, ["D*", "A", "B", "C"], cx);
2157
2158        //   b. Add after the active item
2159        set_labeled_items(&workspace, &pane, ["A", "B*", "C"], cx);
2160        workspace.update(cx, |workspace, cx| {
2161            Pane::add_item(
2162                workspace,
2163                &pane,
2164                Box::new(cx.add_view(|_| TestItem::new().with_label("D"))),
2165                false,
2166                false,
2167                Some(2),
2168                cx,
2169            );
2170        });
2171        assert_item_labels(&pane, ["A", "B", "D*", "C"], cx);
2172
2173        //   c. Add at the end of the item list (including off the length)
2174        set_labeled_items(&workspace, &pane, ["A", "B*", "C"], cx);
2175        workspace.update(cx, |workspace, cx| {
2176            Pane::add_item(
2177                workspace,
2178                &pane,
2179                Box::new(cx.add_view(|_| TestItem::new().with_label("D"))),
2180                false,
2181                false,
2182                Some(5),
2183                cx,
2184            );
2185        });
2186        assert_item_labels(&pane, ["A", "B", "C", "D*"], cx);
2187
2188        // 2. Add without a destination index
2189        //   a. Add with active item at the start of the item list
2190        set_labeled_items(&workspace, &pane, ["A*", "B", "C"], cx);
2191        workspace.update(cx, |workspace, cx| {
2192            Pane::add_item(
2193                workspace,
2194                &pane,
2195                Box::new(cx.add_view(|_| TestItem::new().with_label("D"))),
2196                false,
2197                false,
2198                None,
2199                cx,
2200            );
2201        });
2202        set_labeled_items(&workspace, &pane, ["A", "D*", "B", "C"], cx);
2203
2204        //   b. Add with active item at the end of the item list
2205        set_labeled_items(&workspace, &pane, ["A", "B", "C*"], cx);
2206        workspace.update(cx, |workspace, cx| {
2207            Pane::add_item(
2208                workspace,
2209                &pane,
2210                Box::new(cx.add_view(|_| TestItem::new().with_label("D"))),
2211                false,
2212                false,
2213                None,
2214                cx,
2215            );
2216        });
2217        assert_item_labels(&pane, ["A", "B", "C", "D*"], cx);
2218    }
2219
2220    #[gpui::test]
2221    async fn test_add_item_with_existing_item(cx: &mut TestAppContext) {
2222        cx.foreground().forbid_parking();
2223        Settings::test_async(cx);
2224        let fs = FakeFs::new(cx.background());
2225
2226        let project = Project::test(fs, None, cx).await;
2227        let (_, workspace) = cx.add_window(|cx| Workspace::test_new(project.clone(), cx));
2228        let pane = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
2229
2230        // 1. Add with a destination index
2231        //   1a. Add before the active item
2232        let [_, _, _, d] = set_labeled_items(&workspace, &pane, ["A", "B*", "C", "D"], cx);
2233        workspace.update(cx, |workspace, cx| {
2234            Pane::add_item(workspace, &pane, d, false, false, Some(0), cx);
2235        });
2236        assert_item_labels(&pane, ["D*", "A", "B", "C"], cx);
2237
2238        //   1b. Add after the active item
2239        let [_, _, _, d] = set_labeled_items(&workspace, &pane, ["A", "B*", "C", "D"], cx);
2240        workspace.update(cx, |workspace, cx| {
2241            Pane::add_item(workspace, &pane, d, false, false, Some(2), cx);
2242        });
2243        assert_item_labels(&pane, ["A", "B", "D*", "C"], cx);
2244
2245        //   1c. Add at the end of the item list (including off the length)
2246        let [a, _, _, _] = set_labeled_items(&workspace, &pane, ["A", "B*", "C", "D"], cx);
2247        workspace.update(cx, |workspace, cx| {
2248            Pane::add_item(workspace, &pane, a, false, false, Some(5), cx);
2249        });
2250        assert_item_labels(&pane, ["B", "C", "D", "A*"], cx);
2251
2252        //   1d. Add same item to active index
2253        let [_, b, _] = set_labeled_items(&workspace, &pane, ["A", "B*", "C"], cx);
2254        workspace.update(cx, |workspace, cx| {
2255            Pane::add_item(workspace, &pane, b, false, false, Some(1), cx);
2256        });
2257        assert_item_labels(&pane, ["A", "B*", "C"], cx);
2258
2259        //   1e. Add item to index after same item in last position
2260        let [_, _, c] = set_labeled_items(&workspace, &pane, ["A", "B*", "C"], cx);
2261        workspace.update(cx, |workspace, cx| {
2262            Pane::add_item(workspace, &pane, c, false, false, Some(2), cx);
2263        });
2264        assert_item_labels(&pane, ["A", "B", "C*"], cx);
2265
2266        // 2. Add without a destination index
2267        //   2a. Add with active item at the start of the item list
2268        let [_, _, _, d] = set_labeled_items(&workspace, &pane, ["A*", "B", "C", "D"], cx);
2269        workspace.update(cx, |workspace, cx| {
2270            Pane::add_item(workspace, &pane, d, false, false, None, cx);
2271        });
2272        assert_item_labels(&pane, ["A", "D*", "B", "C"], cx);
2273
2274        //   2b. Add with active item at the end of the item list
2275        let [a, _, _, _] = set_labeled_items(&workspace, &pane, ["A", "B", "C", "D*"], cx);
2276        workspace.update(cx, |workspace, cx| {
2277            Pane::add_item(workspace, &pane, a, false, false, None, cx);
2278        });
2279        assert_item_labels(&pane, ["B", "C", "D", "A*"], cx);
2280
2281        //   2c. Add active item to active item at end of list
2282        let [_, _, c] = set_labeled_items(&workspace, &pane, ["A", "B", "C*"], cx);
2283        workspace.update(cx, |workspace, cx| {
2284            Pane::add_item(workspace, &pane, c, false, false, None, cx);
2285        });
2286        assert_item_labels(&pane, ["A", "B", "C*"], cx);
2287
2288        //   2d. Add active item to active item at start of list
2289        let [a, _, _] = set_labeled_items(&workspace, &pane, ["A*", "B", "C"], cx);
2290        workspace.update(cx, |workspace, cx| {
2291            Pane::add_item(workspace, &pane, a, false, false, None, cx);
2292        });
2293        assert_item_labels(&pane, ["A*", "B", "C"], cx);
2294    }
2295
2296    #[gpui::test]
2297    async fn test_add_item_with_same_project_entries(cx: &mut TestAppContext) {
2298        cx.foreground().forbid_parking();
2299        Settings::test_async(cx);
2300        let fs = FakeFs::new(cx.background());
2301
2302        let project = Project::test(fs, None, cx).await;
2303        let (_, workspace) = cx.add_window(|cx| Workspace::test_new(project.clone(), cx));
2304        let pane = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
2305
2306        // singleton view
2307        workspace.update(cx, |workspace, cx| {
2308            let item = TestItem::new()
2309                .with_singleton(true)
2310                .with_label("buffer 1")
2311                .with_project_items(&[TestProjectItem::new(1, "one.txt", cx)]);
2312
2313            Pane::add_item(
2314                workspace,
2315                &pane,
2316                Box::new(cx.add_view(|_| item)),
2317                false,
2318                false,
2319                None,
2320                cx,
2321            );
2322        });
2323        assert_item_labels(&pane, ["buffer 1*"], cx);
2324
2325        // new singleton view with the same project entry
2326        workspace.update(cx, |workspace, cx| {
2327            let item = TestItem::new()
2328                .with_singleton(true)
2329                .with_label("buffer 1")
2330                .with_project_items(&[TestProjectItem::new(1, "1.txt", cx)]);
2331
2332            Pane::add_item(
2333                workspace,
2334                &pane,
2335                Box::new(cx.add_view(|_| item)),
2336                false,
2337                false,
2338                None,
2339                cx,
2340            );
2341        });
2342        assert_item_labels(&pane, ["buffer 1*"], cx);
2343
2344        // new singleton view with different project entry
2345        workspace.update(cx, |workspace, cx| {
2346            let item = TestItem::new()
2347                .with_singleton(true)
2348                .with_label("buffer 2")
2349                .with_project_items(&[TestProjectItem::new(2, "2.txt", cx)]);
2350
2351            Pane::add_item(
2352                workspace,
2353                &pane,
2354                Box::new(cx.add_view(|_| item)),
2355                false,
2356                false,
2357                None,
2358                cx,
2359            );
2360        });
2361        assert_item_labels(&pane, ["buffer 1", "buffer 2*"], cx);
2362
2363        // new multibuffer view with the same project entry
2364        workspace.update(cx, |workspace, cx| {
2365            let item = TestItem::new()
2366                .with_singleton(false)
2367                .with_label("multibuffer 1")
2368                .with_project_items(&[TestProjectItem::new(1, "1.txt", cx)]);
2369
2370            Pane::add_item(
2371                workspace,
2372                &pane,
2373                Box::new(cx.add_view(|_| item)),
2374                false,
2375                false,
2376                None,
2377                cx,
2378            );
2379        });
2380        assert_item_labels(&pane, ["buffer 1", "buffer 2", "multibuffer 1*"], cx);
2381
2382        // another multibuffer view with the same project entry
2383        workspace.update(cx, |workspace, cx| {
2384            let item = TestItem::new()
2385                .with_singleton(false)
2386                .with_label("multibuffer 1b")
2387                .with_project_items(&[TestProjectItem::new(1, "1.txt", cx)]);
2388
2389            Pane::add_item(
2390                workspace,
2391                &pane,
2392                Box::new(cx.add_view(|_| item)),
2393                false,
2394                false,
2395                None,
2396                cx,
2397            );
2398        });
2399        assert_item_labels(
2400            &pane,
2401            ["buffer 1", "buffer 2", "multibuffer 1", "multibuffer 1b*"],
2402            cx,
2403        );
2404    }
2405
2406    #[gpui::test]
2407    async fn test_remove_item_ordering(deterministic: Arc<Deterministic>, cx: &mut TestAppContext) {
2408        Settings::test_async(cx);
2409        let fs = FakeFs::new(cx.background());
2410
2411        let project = Project::test(fs, None, cx).await;
2412        let (_, workspace) = cx.add_window(|cx| Workspace::test_new(project.clone(), cx));
2413        let pane = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
2414
2415        add_labeled_item(&workspace, &pane, "A", false, cx);
2416        add_labeled_item(&workspace, &pane, "B", false, cx);
2417        add_labeled_item(&workspace, &pane, "C", false, cx);
2418        add_labeled_item(&workspace, &pane, "D", false, cx);
2419        assert_item_labels(&pane, ["A", "B", "C", "D*"], cx);
2420
2421        pane.update(cx, |pane, cx| pane.activate_item(1, false, false, cx));
2422        add_labeled_item(&workspace, &pane, "1", false, cx);
2423        assert_item_labels(&pane, ["A", "B", "1*", "C", "D"], cx);
2424
2425        workspace.update(cx, |workspace, cx| {
2426            Pane::close_active_item(workspace, &CloseActiveItem, cx);
2427        });
2428        deterministic.run_until_parked();
2429        assert_item_labels(&pane, ["A", "B*", "C", "D"], cx);
2430
2431        pane.update(cx, |pane, cx| pane.activate_item(3, false, false, cx));
2432        assert_item_labels(&pane, ["A", "B", "C", "D*"], cx);
2433
2434        workspace.update(cx, |workspace, cx| {
2435            Pane::close_active_item(workspace, &CloseActiveItem, cx);
2436        });
2437        deterministic.run_until_parked();
2438        assert_item_labels(&pane, ["A", "B*", "C"], cx);
2439
2440        workspace.update(cx, |workspace, cx| {
2441            Pane::close_active_item(workspace, &CloseActiveItem, cx);
2442        });
2443        deterministic.run_until_parked();
2444        assert_item_labels(&pane, ["A", "C*"], cx);
2445
2446        workspace.update(cx, |workspace, cx| {
2447            Pane::close_active_item(workspace, &CloseActiveItem, cx);
2448        });
2449        deterministic.run_until_parked();
2450        assert_item_labels(&pane, ["A*"], cx);
2451    }
2452
2453    #[gpui::test]
2454    async fn test_close_inactive_items(deterministic: Arc<Deterministic>, cx: &mut TestAppContext) {
2455        Settings::test_async(cx);
2456        let fs = FakeFs::new(cx.background());
2457
2458        let project = Project::test(fs, None, cx).await;
2459        let (_, workspace) = cx.add_window(|cx| Workspace::test_new(project.clone(), cx));
2460        let pane = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
2461
2462        set_labeled_items(&workspace, &pane, ["A", "B", "C*", "D", "E"], cx);
2463
2464        workspace.update(cx, |workspace, cx| {
2465            Pane::close_inactive_items(workspace, &CloseInactiveItems, cx);
2466        });
2467
2468        deterministic.run_until_parked();
2469        assert_item_labels(&pane, ["C*"], cx);
2470    }
2471
2472    #[gpui::test]
2473    async fn test_close_clean_items(deterministic: Arc<Deterministic>, cx: &mut TestAppContext) {
2474        Settings::test_async(cx);
2475        let fs = FakeFs::new(cx.background());
2476
2477        let project = Project::test(fs, None, cx).await;
2478        let (_, workspace) = cx.add_window(|cx| Workspace::test_new(project.clone(), cx));
2479        let pane = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
2480
2481        add_labeled_item(&workspace, &pane, "A", true, cx);
2482        add_labeled_item(&workspace, &pane, "B", false, cx);
2483        add_labeled_item(&workspace, &pane, "C", true, cx);
2484        add_labeled_item(&workspace, &pane, "D", false, cx);
2485        add_labeled_item(&workspace, &pane, "E", false, cx);
2486        assert_item_labels(&pane, ["A^", "B", "C^", "D", "E*"], cx);
2487
2488        workspace.update(cx, |workspace, cx| {
2489            Pane::close_clean_items(workspace, &CloseCleanItems, cx);
2490        });
2491
2492        deterministic.run_until_parked();
2493        assert_item_labels(&pane, ["A^", "C*^"], cx);
2494    }
2495
2496    #[gpui::test]
2497    async fn test_close_items_to_the_left(
2498        deterministic: Arc<Deterministic>,
2499        cx: &mut TestAppContext,
2500    ) {
2501        Settings::test_async(cx);
2502        let fs = FakeFs::new(cx.background());
2503
2504        let project = Project::test(fs, None, cx).await;
2505        let (_, workspace) = cx.add_window(|cx| Workspace::test_new(project.clone(), cx));
2506        let pane = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
2507
2508        set_labeled_items(&workspace, &pane, ["A", "B", "C*", "D", "E"], cx);
2509
2510        workspace.update(cx, |workspace, cx| {
2511            Pane::close_items_to_the_left(workspace, &CloseItemsToTheLeft, cx);
2512        });
2513
2514        deterministic.run_until_parked();
2515        assert_item_labels(&pane, ["C*", "D", "E"], cx);
2516    }
2517
2518    #[gpui::test]
2519    async fn test_close_items_to_the_right(
2520        deterministic: Arc<Deterministic>,
2521        cx: &mut TestAppContext,
2522    ) {
2523        Settings::test_async(cx);
2524        let fs = FakeFs::new(cx.background());
2525
2526        let project = Project::test(fs, None, cx).await;
2527        let (_, workspace) = cx.add_window(|cx| Workspace::test_new(project.clone(), cx));
2528        let pane = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
2529
2530        set_labeled_items(&workspace, &pane, ["A", "B", "C*", "D", "E"], cx);
2531
2532        workspace.update(cx, |workspace, cx| {
2533            Pane::close_items_to_the_right(workspace, &CloseItemsToTheRight, cx);
2534        });
2535
2536        deterministic.run_until_parked();
2537        assert_item_labels(&pane, ["A", "B", "C*"], cx);
2538    }
2539
2540    #[gpui::test]
2541    async fn test_close_all_items(deterministic: Arc<Deterministic>, cx: &mut TestAppContext) {
2542        Settings::test_async(cx);
2543        let fs = FakeFs::new(cx.background());
2544
2545        let project = Project::test(fs, None, cx).await;
2546        let (_, workspace) = cx.add_window(|cx| Workspace::test_new(project.clone(), cx));
2547        let pane = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
2548
2549        add_labeled_item(&workspace, &pane, "A", false, cx);
2550        add_labeled_item(&workspace, &pane, "B", false, cx);
2551        add_labeled_item(&workspace, &pane, "C", false, cx);
2552        assert_item_labels(&pane, ["A", "B", "C*"], cx);
2553
2554        workspace.update(cx, |workspace, cx| {
2555            Pane::close_all_items(workspace, &CloseAllItems, cx);
2556        });
2557
2558        deterministic.run_until_parked();
2559        assert_item_labels(&pane, [], cx);
2560    }
2561
2562    fn add_labeled_item(
2563        workspace: &ViewHandle<Workspace>,
2564        pane: &ViewHandle<Pane>,
2565        label: &str,
2566        is_dirty: bool,
2567        cx: &mut TestAppContext,
2568    ) -> Box<ViewHandle<TestItem>> {
2569        workspace.update(cx, |workspace, cx| {
2570            let labeled_item =
2571                Box::new(cx.add_view(|_| TestItem::new().with_label(label).with_dirty(is_dirty)));
2572
2573            Pane::add_item(
2574                workspace,
2575                pane,
2576                labeled_item.clone(),
2577                false,
2578                false,
2579                None,
2580                cx,
2581            );
2582
2583            labeled_item
2584        })
2585    }
2586
2587    fn set_labeled_items<const COUNT: usize>(
2588        workspace: &ViewHandle<Workspace>,
2589        pane: &ViewHandle<Pane>,
2590        labels: [&str; COUNT],
2591        cx: &mut TestAppContext,
2592    ) -> [Box<ViewHandle<TestItem>>; COUNT] {
2593        pane.update(cx, |pane, _| {
2594            pane.items.clear();
2595        });
2596
2597        workspace.update(cx, |workspace, cx| {
2598            let mut active_item_index = 0;
2599
2600            let mut index = 0;
2601            let items = labels.map(|mut label| {
2602                if label.ends_with("*") {
2603                    label = label.trim_end_matches("*");
2604                    active_item_index = index;
2605                }
2606
2607                let labeled_item = Box::new(cx.add_view(|_| TestItem::new().with_label(label)));
2608                Pane::add_item(
2609                    workspace,
2610                    pane,
2611                    labeled_item.clone(),
2612                    false,
2613                    false,
2614                    None,
2615                    cx,
2616                );
2617                index += 1;
2618                labeled_item
2619            });
2620
2621            pane.update(cx, |pane, cx| {
2622                pane.activate_item(active_item_index, false, false, cx)
2623            });
2624
2625            items
2626        })
2627    }
2628
2629    // Assert the item label, with the active item label suffixed with a '*'
2630    fn assert_item_labels<const COUNT: usize>(
2631        pane: &ViewHandle<Pane>,
2632        expected_states: [&str; COUNT],
2633        cx: &mut TestAppContext,
2634    ) {
2635        pane.read_with(cx, |pane, cx| {
2636            let actual_states = pane
2637                .items
2638                .iter()
2639                .enumerate()
2640                .map(|(ix, item)| {
2641                    let mut state = item
2642                        .as_any()
2643                        .downcast_ref::<TestItem>()
2644                        .unwrap()
2645                        .read(cx)
2646                        .label
2647                        .clone();
2648                    if ix == pane.active_item_index {
2649                        state.push('*');
2650                    }
2651                    if item.is_dirty(cx) {
2652                        state.push('^');
2653                    }
2654                    state
2655                })
2656                .collect::<Vec<_>>();
2657
2658            assert_eq!(
2659                actual_states, expected_states,
2660                "pane items do not match expectation"
2661            );
2662        })
2663    }
2664}