1use super::{ItemViewHandle, SplitDirection};
2use crate::{ItemHandle, ItemView, Settings, WeakItemViewHandle, Workspace};
3use collections::{HashMap, VecDeque};
4use gpui::{
5 action,
6 elements::*,
7 geometry::{rect::RectF, vector::vec2f},
8 keymap::Binding,
9 platform::CursorStyle,
10 AnyViewHandle, Entity, MutableAppContext, Quad, RenderContext, Task, View, ViewContext,
11 ViewHandle,
12};
13use postage::watch;
14use project::ProjectPath;
15use std::{
16 any::{Any, TypeId},
17 cell::RefCell,
18 cmp, mem,
19 rc::Rc,
20};
21use util::ResultExt;
22
23action!(Split, SplitDirection);
24action!(ActivateItem, usize);
25action!(ActivatePrevItem);
26action!(ActivateNextItem);
27action!(CloseActiveItem);
28action!(CloseItem, usize);
29action!(GoBack);
30action!(GoForward);
31
32const MAX_NAVIGATION_HISTORY_LEN: usize = 1024;
33
34pub fn init(cx: &mut MutableAppContext) {
35 cx.add_action(|pane: &mut Pane, action: &ActivateItem, cx| {
36 pane.activate_item(action.0, cx);
37 });
38 cx.add_action(|pane: &mut Pane, _: &ActivatePrevItem, cx| {
39 pane.activate_prev_item(cx);
40 });
41 cx.add_action(|pane: &mut Pane, _: &ActivateNextItem, cx| {
42 pane.activate_next_item(cx);
43 });
44 cx.add_action(|pane: &mut Pane, _: &CloseActiveItem, cx| {
45 pane.close_active_item(cx);
46 });
47 cx.add_action(|pane: &mut Pane, action: &CloseItem, cx| {
48 pane.close_item(action.0, cx);
49 });
50 cx.add_action(|pane: &mut Pane, action: &Split, cx| {
51 pane.split(action.0, cx);
52 });
53 cx.add_action(|workspace: &mut Workspace, _: &GoBack, cx| {
54 Pane::go_back(workspace, cx).detach();
55 });
56 cx.add_action(|workspace: &mut Workspace, _: &GoForward, cx| {
57 Pane::go_forward(workspace, cx).detach();
58 });
59
60 cx.add_bindings(vec![
61 Binding::new("shift-cmd-{", ActivatePrevItem, Some("Pane")),
62 Binding::new("shift-cmd-}", ActivateNextItem, Some("Pane")),
63 Binding::new("cmd-w", CloseActiveItem, Some("Pane")),
64 Binding::new("cmd-k up", Split(SplitDirection::Up), Some("Pane")),
65 Binding::new("cmd-k down", Split(SplitDirection::Down), Some("Pane")),
66 Binding::new("cmd-k left", Split(SplitDirection::Left), Some("Pane")),
67 Binding::new("cmd-k right", Split(SplitDirection::Right), Some("Pane")),
68 Binding::new("ctrl--", GoBack, Some("Pane")),
69 Binding::new("shift-ctrl-_", GoForward, Some("Pane")),
70 ]);
71}
72
73pub enum Event {
74 Activate,
75 Remove,
76 Split(SplitDirection),
77}
78
79pub struct Pane {
80 item_views: Vec<(usize, Box<dyn ItemViewHandle>)>,
81 active_item_index: usize,
82 settings: watch::Receiver<Settings>,
83 nav_history: Rc<RefCell<NavHistory>>,
84 toolbars: HashMap<TypeId, Box<dyn ToolbarHandle>>,
85 active_toolbar_type: Option<TypeId>,
86 active_toolbar_visible: bool,
87}
88
89pub trait Toolbar: View {
90 fn active_item_changed(
91 &mut self,
92 item: Option<Box<dyn ItemViewHandle>>,
93 cx: &mut ViewContext<Self>,
94 ) -> bool;
95 fn on_dismiss(&mut self, cx: &mut ViewContext<Self>);
96}
97
98trait ToolbarHandle {
99 fn active_item_changed(
100 &self,
101 item: Option<Box<dyn ItemViewHandle>>,
102 cx: &mut MutableAppContext,
103 ) -> bool;
104 fn on_dismiss(&self, cx: &mut MutableAppContext);
105 fn to_any(&self) -> AnyViewHandle;
106}
107
108pub struct ItemNavHistory {
109 history: Rc<RefCell<NavHistory>>,
110 item_view: Rc<dyn WeakItemViewHandle>,
111}
112
113#[derive(Default)]
114pub struct NavHistory {
115 mode: NavigationMode,
116 backward_stack: VecDeque<NavigationEntry>,
117 forward_stack: VecDeque<NavigationEntry>,
118 paths_by_item: HashMap<usize, ProjectPath>,
119}
120
121#[derive(Copy, Clone)]
122enum NavigationMode {
123 Normal,
124 GoingBack,
125 GoingForward,
126 Disabled,
127}
128
129impl Default for NavigationMode {
130 fn default() -> Self {
131 Self::Normal
132 }
133}
134
135pub struct NavigationEntry {
136 pub item_view: Rc<dyn WeakItemViewHandle>,
137 pub data: Option<Box<dyn Any>>,
138}
139
140impl Pane {
141 pub fn new(settings: watch::Receiver<Settings>) -> Self {
142 Self {
143 item_views: Vec::new(),
144 active_item_index: 0,
145 settings,
146 nav_history: Default::default(),
147 toolbars: Default::default(),
148 active_toolbar_type: Default::default(),
149 active_toolbar_visible: false,
150 }
151 }
152
153 pub fn nav_history(&self) -> &Rc<RefCell<NavHistory>> {
154 &self.nav_history
155 }
156
157 pub fn activate(&self, cx: &mut ViewContext<Self>) {
158 cx.emit(Event::Activate);
159 }
160
161 pub fn go_back(workspace: &mut Workspace, cx: &mut ViewContext<Workspace>) -> Task<()> {
162 Self::navigate_history(
163 workspace,
164 workspace.active_pane().clone(),
165 NavigationMode::GoingBack,
166 cx,
167 )
168 }
169
170 pub fn go_forward(workspace: &mut Workspace, cx: &mut ViewContext<Workspace>) -> Task<()> {
171 Self::navigate_history(
172 workspace,
173 workspace.active_pane().clone(),
174 NavigationMode::GoingForward,
175 cx,
176 )
177 }
178
179 fn navigate_history(
180 workspace: &mut Workspace,
181 pane: ViewHandle<Pane>,
182 mode: NavigationMode,
183 cx: &mut ViewContext<Workspace>,
184 ) -> Task<()> {
185 let to_load = pane.update(cx, |pane, cx| {
186 // Retrieve the weak item handle from the history.
187 let entry = pane.nav_history.borrow_mut().pop(mode)?;
188
189 // If the item is still present in this pane, then activate it.
190 if let Some(index) = entry
191 .item_view
192 .upgrade(cx)
193 .and_then(|v| pane.index_for_item_view(v.as_ref()))
194 {
195 if let Some(item_view) = pane.active_item() {
196 pane.nav_history.borrow_mut().set_mode(mode);
197 item_view.deactivated(cx);
198 pane.nav_history
199 .borrow_mut()
200 .set_mode(NavigationMode::Normal);
201 }
202
203 pane.active_item_index = index;
204 pane.focus_active_item(cx);
205 if let Some(data) = entry.data {
206 pane.active_item()?.navigate(data, cx);
207 }
208 cx.notify();
209 None
210 }
211 // If the item is no longer present in this pane, then retrieve its
212 // project path in order to reopen it.
213 else {
214 pane.nav_history
215 .borrow_mut()
216 .paths_by_item
217 .get(&entry.item_view.id())
218 .cloned()
219 .map(|project_path| (project_path, entry))
220 }
221 });
222
223 if let Some((project_path, entry)) = to_load {
224 // If the item was no longer present, then load it again from its previous path.
225 let pane = pane.downgrade();
226 let task = workspace.load_path(project_path, cx);
227 cx.spawn(|workspace, mut cx| async move {
228 let item = task.await;
229 if let Some(pane) = pane.upgrade(&cx) {
230 if let Some(item) = item.log_err() {
231 workspace.update(&mut cx, |workspace, cx| {
232 pane.update(cx, |p, _| p.nav_history.borrow_mut().set_mode(mode));
233 let item_view = workspace.open_item_in_pane(item, &pane, cx);
234 pane.update(cx, |p, _| {
235 p.nav_history.borrow_mut().set_mode(NavigationMode::Normal)
236 });
237
238 if let Some(data) = entry.data {
239 item_view.navigate(data, cx);
240 }
241 });
242 } else {
243 workspace
244 .update(&mut cx, |workspace, cx| {
245 Self::navigate_history(workspace, pane, mode, cx)
246 })
247 .await;
248 }
249 }
250 })
251 } else {
252 Task::ready(())
253 }
254 }
255
256 pub fn open_item<T>(
257 &mut self,
258 item_handle: T,
259 workspace: &Workspace,
260 cx: &mut ViewContext<Self>,
261 ) -> Box<dyn ItemViewHandle>
262 where
263 T: 'static + ItemHandle,
264 {
265 for (ix, (item_id, item_view)) in self.item_views.iter().enumerate() {
266 if *item_id == item_handle.id() {
267 let item_view = item_view.boxed_clone();
268 self.activate_item(ix, cx);
269 return item_view;
270 }
271 }
272
273 let item_view =
274 item_handle.add_view(cx.window_id(), workspace, self.nav_history.clone(), cx);
275 self.add_item_view(item_view.boxed_clone(), cx);
276 item_view
277 }
278
279 pub fn add_item_view(
280 &mut self,
281 mut item_view: Box<dyn ItemViewHandle>,
282 cx: &mut ViewContext<Self>,
283 ) {
284 item_view.added_to_pane(cx);
285 let item_idx = cmp::min(self.active_item_index + 1, self.item_views.len());
286 self.item_views
287 .insert(item_idx, (item_view.item(cx).id(), item_view));
288 self.activate_item(item_idx, cx);
289 cx.notify();
290 }
291
292 pub fn contains_item(&self, item: &dyn ItemHandle) -> bool {
293 let item_id = item.id();
294 self.item_views
295 .iter()
296 .any(|(existing_item_id, _)| *existing_item_id == item_id)
297 }
298
299 pub fn item_views(&self) -> impl Iterator<Item = &Box<dyn ItemViewHandle>> {
300 self.item_views.iter().map(|(_, view)| view)
301 }
302
303 pub fn active_item(&self) -> Option<Box<dyn ItemViewHandle>> {
304 self.item_views
305 .get(self.active_item_index)
306 .map(|(_, view)| view.clone())
307 }
308
309 pub fn index_for_item_view(&self, item_view: &dyn ItemViewHandle) -> Option<usize> {
310 self.item_views
311 .iter()
312 .position(|(_, i)| i.id() == item_view.id())
313 }
314
315 pub fn index_for_item(&self, item: &dyn ItemHandle) -> Option<usize> {
316 self.item_views.iter().position(|(id, _)| *id == item.id())
317 }
318
319 pub fn activate_item(&mut self, index: usize, cx: &mut ViewContext<Self>) {
320 if index < self.item_views.len() {
321 let prev_active_item_ix = mem::replace(&mut self.active_item_index, index);
322 if prev_active_item_ix != self.active_item_index
323 && prev_active_item_ix < self.item_views.len()
324 {
325 self.item_views[prev_active_item_ix].1.deactivated(cx);
326 }
327 self.update_active_toolbar(cx);
328 self.focus_active_item(cx);
329 cx.notify();
330 }
331 }
332
333 pub fn activate_prev_item(&mut self, cx: &mut ViewContext<Self>) {
334 let mut index = self.active_item_index;
335 if index > 0 {
336 index -= 1;
337 } else if self.item_views.len() > 0 {
338 index = self.item_views.len() - 1;
339 }
340 self.activate_item(index, cx);
341 }
342
343 pub fn activate_next_item(&mut self, cx: &mut ViewContext<Self>) {
344 let mut index = self.active_item_index;
345 if index + 1 < self.item_views.len() {
346 index += 1;
347 } else {
348 index = 0;
349 }
350 self.activate_item(index, cx);
351 }
352
353 pub fn close_active_item(&mut self, cx: &mut ViewContext<Self>) {
354 if !self.item_views.is_empty() {
355 self.close_item(self.item_views[self.active_item_index].1.id(), cx)
356 }
357 }
358
359 pub fn close_item(&mut self, item_view_id: usize, cx: &mut ViewContext<Self>) {
360 let mut item_ix = 0;
361 self.item_views.retain(|(_, item_view)| {
362 if item_view.id() == item_view_id {
363 if item_ix == self.active_item_index {
364 item_view.deactivated(cx);
365 }
366
367 let mut nav_history = self.nav_history.borrow_mut();
368 if let Some(path) = item_view.project_path(cx) {
369 nav_history.paths_by_item.insert(item_view.id(), path);
370 } else {
371 nav_history.paths_by_item.remove(&item_view.id());
372 }
373
374 item_ix += 1;
375 false
376 } else {
377 item_ix += 1;
378 true
379 }
380 });
381 self.activate_item(
382 cmp::min(
383 self.active_item_index,
384 self.item_views.len().saturating_sub(1),
385 ),
386 cx,
387 );
388
389 if self.item_views.is_empty() {
390 self.update_active_toolbar(cx);
391 cx.emit(Event::Remove);
392 }
393
394 cx.notify();
395 }
396
397 fn focus_active_item(&mut self, cx: &mut ViewContext<Self>) {
398 if let Some(active_item) = self.active_item() {
399 cx.focus(active_item);
400 }
401 }
402
403 pub fn split(&mut self, direction: SplitDirection, cx: &mut ViewContext<Self>) {
404 cx.emit(Event::Split(direction));
405 }
406
407 pub fn show_toolbar<F, V>(&mut self, cx: &mut ViewContext<Self>, build_toolbar: F)
408 where
409 F: FnOnce(&mut ViewContext<V>) -> V,
410 V: Toolbar,
411 {
412 let type_id = TypeId::of::<V>();
413 if self.active_toolbar_type != Some(type_id) {
414 self.dismiss_toolbar(cx);
415
416 let active_item = self.active_item();
417 self.toolbars
418 .entry(type_id)
419 .or_insert_with(|| Box::new(cx.add_view(build_toolbar)));
420
421 self.active_toolbar_type = Some(type_id);
422 self.active_toolbar_visible =
423 self.toolbars[&type_id].active_item_changed(active_item, cx);
424 cx.notify();
425 }
426 }
427
428 pub fn dismiss_toolbar(&mut self, cx: &mut ViewContext<Self>) {
429 if let Some(active_toolbar_type) = self.active_toolbar_type.take() {
430 self.toolbars
431 .get_mut(&active_toolbar_type)
432 .unwrap()
433 .on_dismiss(cx);
434 self.active_toolbar_visible = false;
435 self.focus_active_item(cx);
436 cx.notify();
437 }
438 }
439
440 pub fn toolbar<T: Toolbar>(&self) -> Option<ViewHandle<T>> {
441 self.toolbars
442 .get(&TypeId::of::<T>())
443 .and_then(|toolbar| toolbar.to_any().downcast())
444 }
445
446 pub fn active_toolbar(&self) -> Option<AnyViewHandle> {
447 let type_id = self.active_toolbar_type?;
448 let toolbar = self.toolbars.get(&type_id)?;
449 if self.active_toolbar_visible {
450 Some(toolbar.to_any())
451 } else {
452 None
453 }
454 }
455
456 fn update_active_toolbar(&mut self, cx: &mut ViewContext<Self>) {
457 let active_item = self.item_views.get(self.active_item_index);
458 for (toolbar_type_id, toolbar) in &self.toolbars {
459 let visible = toolbar.active_item_changed(active_item.map(|i| i.1.clone()), cx);
460 if Some(*toolbar_type_id) == self.active_toolbar_type {
461 self.active_toolbar_visible = visible;
462 }
463 }
464 }
465
466 fn render_tabs(&self, cx: &mut RenderContext<Self>) -> ElementBox {
467 let settings = self.settings.borrow();
468 let theme = &settings.theme;
469
470 enum Tabs {}
471 let tabs = MouseEventHandler::new::<Tabs, _, _>(0, cx, |mouse_state, cx| {
472 let mut row = Flex::row();
473 for (ix, (_, item_view)) in self.item_views.iter().enumerate() {
474 let is_active = ix == self.active_item_index;
475
476 row.add_child({
477 let tab_style = if is_active {
478 theme.workspace.active_tab.clone()
479 } else {
480 theme.workspace.tab.clone()
481 };
482 let title = item_view.tab_content(&tab_style, cx);
483
484 let mut style = if is_active {
485 theme.workspace.active_tab.clone()
486 } else {
487 theme.workspace.tab.clone()
488 };
489 if ix == 0 {
490 style.container.border.left = false;
491 }
492
493 EventHandler::new(
494 Container::new(
495 Flex::row()
496 .with_child(
497 Align::new({
498 let diameter = 7.0;
499 let icon_color = if item_view.has_conflict(cx) {
500 Some(style.icon_conflict)
501 } else if item_view.is_dirty(cx) {
502 Some(style.icon_dirty)
503 } else {
504 None
505 };
506
507 ConstrainedBox::new(
508 Canvas::new(move |bounds, _, cx| {
509 if let Some(color) = icon_color {
510 let square = RectF::new(
511 bounds.origin(),
512 vec2f(diameter, diameter),
513 );
514 cx.scene.push_quad(Quad {
515 bounds: square,
516 background: Some(color),
517 border: Default::default(),
518 corner_radius: diameter / 2.,
519 });
520 }
521 })
522 .boxed(),
523 )
524 .with_width(diameter)
525 .with_height(diameter)
526 .boxed()
527 })
528 .boxed(),
529 )
530 .with_child(
531 Container::new(Align::new(title).boxed())
532 .with_style(ContainerStyle {
533 margin: Margin {
534 left: style.spacing,
535 right: style.spacing,
536 ..Default::default()
537 },
538 ..Default::default()
539 })
540 .boxed(),
541 )
542 .with_child(
543 Align::new(
544 ConstrainedBox::new(if mouse_state.hovered {
545 let item_id = item_view.id();
546 enum TabCloseButton {}
547 let icon = Svg::new("icons/x.svg");
548 MouseEventHandler::new::<TabCloseButton, _, _>(
549 item_id,
550 cx,
551 |mouse_state, _| {
552 if mouse_state.hovered {
553 icon.with_color(style.icon_close_active)
554 .boxed()
555 } else {
556 icon.with_color(style.icon_close).boxed()
557 }
558 },
559 )
560 .with_padding(Padding::uniform(4.))
561 .with_cursor_style(CursorStyle::PointingHand)
562 .on_click(move |cx| {
563 cx.dispatch_action(CloseItem(item_id))
564 })
565 .named("close-tab-icon")
566 } else {
567 Empty::new().boxed()
568 })
569 .with_width(style.icon_width)
570 .boxed(),
571 )
572 .boxed(),
573 )
574 .boxed(),
575 )
576 .with_style(style.container)
577 .boxed(),
578 )
579 .on_mouse_down(move |cx| {
580 cx.dispatch_action(ActivateItem(ix));
581 true
582 })
583 .boxed()
584 })
585 }
586
587 row.add_child(
588 Empty::new()
589 .contained()
590 .with_border(theme.workspace.tab.container.border)
591 .flexible(0., true)
592 .named("filler"),
593 );
594
595 row.boxed()
596 });
597
598 ConstrainedBox::new(tabs.boxed())
599 .with_height(theme.workspace.tab.height)
600 .named("tabs")
601 }
602}
603
604impl Entity for Pane {
605 type Event = Event;
606}
607
608impl View for Pane {
609 fn ui_name() -> &'static str {
610 "Pane"
611 }
612
613 fn render(&mut self, cx: &mut RenderContext<Self>) -> ElementBox {
614 if let Some(active_item) = self.active_item() {
615 Flex::column()
616 .with_child(self.render_tabs(cx))
617 .with_children(
618 self.active_toolbar()
619 .as_ref()
620 .map(|view| ChildView::new(view).boxed()),
621 )
622 .with_child(ChildView::new(active_item).flexible(1., true).boxed())
623 .named("pane")
624 } else {
625 Empty::new().named("pane")
626 }
627 }
628
629 fn on_focus(&mut self, cx: &mut ViewContext<Self>) {
630 self.focus_active_item(cx);
631 }
632}
633
634impl<T: Toolbar> ToolbarHandle for ViewHandle<T> {
635 fn active_item_changed(
636 &self,
637 item: Option<Box<dyn ItemViewHandle>>,
638 cx: &mut MutableAppContext,
639 ) -> bool {
640 self.update(cx, |this, cx| this.active_item_changed(item, cx))
641 }
642
643 fn on_dismiss(&self, cx: &mut MutableAppContext) {
644 self.update(cx, |this, cx| this.on_dismiss(cx));
645 }
646
647 fn to_any(&self) -> AnyViewHandle {
648 self.into()
649 }
650}
651
652impl ItemNavHistory {
653 pub fn new<T: ItemView>(history: Rc<RefCell<NavHistory>>, item_view: &ViewHandle<T>) -> Self {
654 Self {
655 history,
656 item_view: Rc::new(item_view.downgrade()),
657 }
658 }
659
660 pub fn history(&self) -> Rc<RefCell<NavHistory>> {
661 self.history.clone()
662 }
663
664 pub fn push<D: 'static + Any>(&self, data: Option<D>) {
665 self.history.borrow_mut().push(data, self.item_view.clone());
666 }
667}
668
669impl NavHistory {
670 pub fn disable(&mut self) {
671 self.mode = NavigationMode::Disabled;
672 }
673
674 pub fn enable(&mut self) {
675 self.mode = NavigationMode::Normal;
676 }
677
678 pub fn pop_backward(&mut self) -> Option<NavigationEntry> {
679 self.backward_stack.pop_back()
680 }
681
682 pub fn pop_forward(&mut self) -> Option<NavigationEntry> {
683 self.forward_stack.pop_back()
684 }
685
686 fn pop(&mut self, mode: NavigationMode) -> Option<NavigationEntry> {
687 match mode {
688 NavigationMode::Normal | NavigationMode::Disabled => None,
689 NavigationMode::GoingBack => self.pop_backward(),
690 NavigationMode::GoingForward => self.pop_forward(),
691 }
692 }
693
694 fn set_mode(&mut self, mode: NavigationMode) {
695 self.mode = mode;
696 }
697
698 pub fn push<D: 'static + Any>(
699 &mut self,
700 data: Option<D>,
701 item_view: Rc<dyn WeakItemViewHandle>,
702 ) {
703 match self.mode {
704 NavigationMode::Disabled => {}
705 NavigationMode::Normal => {
706 if self.backward_stack.len() >= MAX_NAVIGATION_HISTORY_LEN {
707 self.backward_stack.pop_front();
708 }
709 self.backward_stack.push_back(NavigationEntry {
710 item_view,
711 data: data.map(|data| Box::new(data) as Box<dyn Any>),
712 });
713 self.forward_stack.clear();
714 }
715 NavigationMode::GoingBack => {
716 if self.forward_stack.len() >= MAX_NAVIGATION_HISTORY_LEN {
717 self.forward_stack.pop_front();
718 }
719 self.forward_stack.push_back(NavigationEntry {
720 item_view,
721 data: data.map(|data| Box::new(data) as Box<dyn Any>),
722 });
723 }
724 NavigationMode::GoingForward => {
725 if self.backward_stack.len() >= MAX_NAVIGATION_HISTORY_LEN {
726 self.backward_stack.pop_front();
727 }
728 self.backward_stack.push_back(NavigationEntry {
729 item_view,
730 data: data.map(|data| Box::new(data) as Box<dyn Any>),
731 });
732 }
733 }
734 }
735}