1use super::{ItemViewHandle, SplitDirection};
2use crate::{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, NavigationDirection},
10 AnyViewHandle, Entity, MutableAppContext, Quad, RenderContext, Task, View, ViewContext,
11 ViewHandle, WeakViewHandle,
12};
13use project::{ProjectEntry, ProjectPath};
14use std::{
15 any::{Any, TypeId},
16 cell::RefCell,
17 cmp, mem,
18 rc::Rc,
19};
20use util::ResultExt;
21
22action!(Split, SplitDirection);
23action!(ActivateItem, usize);
24action!(ActivatePrevItem);
25action!(ActivateNextItem);
26action!(CloseActiveItem);
27action!(CloseInactiveItems);
28action!(CloseItem, usize);
29action!(GoBack, Option<WeakViewHandle<Pane>>);
30action!(GoForward, Option<WeakViewHandle<Pane>>);
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, _: &CloseInactiveItems, cx| {
48 pane.close_inactive_items(cx);
49 });
50 cx.add_action(|pane: &mut Pane, action: &CloseItem, cx| {
51 pane.close_item(action.0, cx);
52 });
53 cx.add_action(|pane: &mut Pane, action: &Split, cx| {
54 pane.split(action.0, cx);
55 });
56 cx.add_action(|workspace: &mut Workspace, action: &GoBack, cx| {
57 Pane::go_back(
58 workspace,
59 action
60 .0
61 .as_ref()
62 .and_then(|weak_handle| weak_handle.upgrade(cx)),
63 cx,
64 )
65 .detach();
66 });
67 cx.add_action(|workspace: &mut Workspace, action: &GoForward, cx| {
68 Pane::go_forward(
69 workspace,
70 action
71 .0
72 .as_ref()
73 .and_then(|weak_handle| weak_handle.upgrade(cx)),
74 cx,
75 )
76 .detach();
77 });
78
79 cx.add_bindings(vec![
80 Binding::new("shift-cmd-{", ActivatePrevItem, Some("Pane")),
81 Binding::new("shift-cmd-}", ActivateNextItem, Some("Pane")),
82 Binding::new("cmd-w", CloseActiveItem, Some("Pane")),
83 Binding::new("alt-cmd-w", CloseInactiveItems, Some("Pane")),
84 Binding::new("cmd-k up", Split(SplitDirection::Up), Some("Pane")),
85 Binding::new("cmd-k down", Split(SplitDirection::Down), Some("Pane")),
86 Binding::new("cmd-k left", Split(SplitDirection::Left), Some("Pane")),
87 Binding::new("cmd-k right", Split(SplitDirection::Right), Some("Pane")),
88 Binding::new("ctrl--", GoBack(None), Some("Pane")),
89 Binding::new("shift-ctrl-_", GoForward(None), Some("Pane")),
90 ]);
91}
92
93pub enum Event {
94 Activate,
95 Remove,
96 Split(SplitDirection),
97}
98
99pub struct Pane {
100 item_views: Vec<(Option<usize>, Box<dyn ItemViewHandle>)>,
101 active_item_index: usize,
102 nav_history: Rc<RefCell<NavHistory>>,
103 toolbars: HashMap<TypeId, Box<dyn ToolbarHandle>>,
104 active_toolbar_type: Option<TypeId>,
105 active_toolbar_visible: bool,
106}
107
108pub trait Toolbar: View {
109 fn active_item_changed(
110 &mut self,
111 item: Option<Box<dyn ItemViewHandle>>,
112 cx: &mut ViewContext<Self>,
113 ) -> bool;
114 fn on_dismiss(&mut self, cx: &mut ViewContext<Self>);
115}
116
117trait ToolbarHandle {
118 fn active_item_changed(
119 &self,
120 item: Option<Box<dyn ItemViewHandle>>,
121 cx: &mut MutableAppContext,
122 ) -> bool;
123 fn on_dismiss(&self, cx: &mut MutableAppContext);
124 fn to_any(&self) -> AnyViewHandle;
125}
126
127pub struct ItemNavHistory {
128 history: Rc<RefCell<NavHistory>>,
129 item_view: Rc<dyn WeakItemViewHandle>,
130}
131
132#[derive(Default)]
133pub struct NavHistory {
134 mode: NavigationMode,
135 backward_stack: VecDeque<NavigationEntry>,
136 forward_stack: VecDeque<NavigationEntry>,
137 paths_by_item: HashMap<usize, ProjectPath>,
138}
139
140#[derive(Copy, Clone)]
141enum NavigationMode {
142 Normal,
143 GoingBack,
144 GoingForward,
145 Disabled,
146}
147
148impl Default for NavigationMode {
149 fn default() -> Self {
150 Self::Normal
151 }
152}
153
154pub struct NavigationEntry {
155 pub item_view: Rc<dyn WeakItemViewHandle>,
156 pub data: Option<Box<dyn Any>>,
157}
158
159impl Pane {
160 pub fn new() -> Self {
161 Self {
162 item_views: Vec::new(),
163 active_item_index: 0,
164 nav_history: Default::default(),
165 toolbars: Default::default(),
166 active_toolbar_type: Default::default(),
167 active_toolbar_visible: false,
168 }
169 }
170
171 pub fn nav_history(&self) -> &Rc<RefCell<NavHistory>> {
172 &self.nav_history
173 }
174
175 pub fn activate(&self, cx: &mut ViewContext<Self>) {
176 cx.emit(Event::Activate);
177 }
178
179 pub fn go_back(
180 workspace: &mut Workspace,
181 pane: Option<ViewHandle<Pane>>,
182 cx: &mut ViewContext<Workspace>,
183 ) -> Task<()> {
184 Self::navigate_history(
185 workspace,
186 pane.unwrap_or_else(|| workspace.active_pane().clone()),
187 NavigationMode::GoingBack,
188 cx,
189 )
190 }
191
192 pub fn go_forward(
193 workspace: &mut Workspace,
194 pane: Option<ViewHandle<Pane>>,
195 cx: &mut ViewContext<Workspace>,
196 ) -> Task<()> {
197 Self::navigate_history(
198 workspace,
199 pane.unwrap_or_else(|| workspace.active_pane().clone()),
200 NavigationMode::GoingForward,
201 cx,
202 )
203 }
204
205 fn navigate_history(
206 workspace: &mut Workspace,
207 pane: ViewHandle<Pane>,
208 mode: NavigationMode,
209 cx: &mut ViewContext<Workspace>,
210 ) -> Task<()> {
211 workspace.activate_pane(pane.clone(), cx);
212
213 let to_load = pane.update(cx, |pane, cx| {
214 // Retrieve the weak item handle from the history.
215 let entry = pane.nav_history.borrow_mut().pop(mode)?;
216
217 // If the item is still present in this pane, then activate it.
218 if let Some(index) = entry
219 .item_view
220 .upgrade(cx)
221 .and_then(|v| pane.index_for_item_view(v.as_ref()))
222 {
223 if let Some(item_view) = pane.active_item() {
224 pane.nav_history.borrow_mut().set_mode(mode);
225 item_view.deactivated(cx);
226 pane.nav_history
227 .borrow_mut()
228 .set_mode(NavigationMode::Normal);
229 }
230
231 pane.active_item_index = index;
232 pane.focus_active_item(cx);
233 if let Some(data) = entry.data {
234 pane.active_item()?.navigate(data, cx);
235 }
236 cx.notify();
237 None
238 }
239 // If the item is no longer present in this pane, then retrieve its
240 // project path in order to reopen it.
241 else {
242 pane.nav_history
243 .borrow_mut()
244 .paths_by_item
245 .get(&entry.item_view.id())
246 .cloned()
247 .map(|project_path| (project_path, entry))
248 }
249 });
250
251 if let Some((project_path, entry)) = to_load {
252 // If the item was no longer present, then load it again from its previous path.
253 let pane = pane.downgrade();
254 let task = workspace.load_path(project_path, cx);
255 cx.spawn(|workspace, mut cx| async move {
256 let item = task.await;
257 if let Some(pane) = pane.upgrade(&cx) {
258 if let Some(item) = item.log_err() {
259 workspace.update(&mut cx, |workspace, cx| {
260 pane.update(cx, |p, _| p.nav_history.borrow_mut().set_mode(mode));
261 let item_view = workspace.open_item_in_pane(item, &pane, cx);
262 pane.update(cx, |p, _| {
263 p.nav_history.borrow_mut().set_mode(NavigationMode::Normal)
264 });
265
266 if let Some(data) = entry.data {
267 item_view.navigate(data, cx);
268 }
269 });
270 } else {
271 workspace
272 .update(&mut cx, |workspace, cx| {
273 Self::navigate_history(workspace, pane, mode, cx)
274 })
275 .await;
276 }
277 }
278 })
279 } else {
280 Task::ready(())
281 }
282 }
283
284 pub fn open_item(
285 &mut self,
286 item_view_to_open: Box<dyn ItemViewHandle>,
287 cx: &mut ViewContext<Self>,
288 ) -> Box<dyn ItemViewHandle> {
289 // Find an existing view for the same project entry.
290 for (ix, (entry_id, item_view)) in self.item_views.iter().enumerate() {
291 if *entry_id == item_view_to_open.project_entry_id(cx) {
292 let item_view = item_view.boxed_clone();
293 self.activate_item(ix, cx);
294 return item_view;
295 }
296 }
297
298 item_view_to_open.set_nav_history(self.nav_history.clone(), cx);
299 self.add_item_view(item_view_to_open.boxed_clone(), cx);
300 item_view_to_open
301 }
302
303 pub fn add_item_view(
304 &mut self,
305 mut item_view: Box<dyn ItemViewHandle>,
306 cx: &mut ViewContext<Self>,
307 ) {
308 item_view.added_to_pane(cx);
309 let item_idx = cmp::min(self.active_item_index + 1, self.item_views.len());
310 self.item_views
311 .insert(item_idx, (item_view.project_entry_id(cx), item_view));
312 self.activate_item(item_idx, cx);
313 cx.notify();
314 }
315
316 pub fn item_views(&self) -> impl Iterator<Item = &Box<dyn ItemViewHandle>> {
317 self.item_views.iter().map(|(_, view)| view)
318 }
319
320 pub fn active_item(&self) -> Option<Box<dyn ItemViewHandle>> {
321 self.item_views
322 .get(self.active_item_index)
323 .map(|(_, view)| view.clone())
324 }
325
326 pub fn item_for_entry(&self, entry: ProjectEntry) -> Option<Box<dyn ItemViewHandle>> {
327 self.item_views.iter().find_map(|(id, view)| {
328 if *id == Some(entry.entry_id) {
329 Some(view.boxed_clone())
330 } else {
331 None
332 }
333 })
334 }
335
336 pub fn index_for_item_view(&self, item_view: &dyn ItemViewHandle) -> Option<usize> {
337 self.item_views
338 .iter()
339 .position(|(_, i)| i.id() == item_view.id())
340 }
341
342 pub fn index_for_item(&self, item: &dyn ItemViewHandle) -> Option<usize> {
343 self.item_views
344 .iter()
345 .position(|(_, my_item)| my_item.id() == item.id())
346 }
347
348 pub fn activate_item(&mut self, index: usize, cx: &mut ViewContext<Self>) {
349 if index < self.item_views.len() {
350 let prev_active_item_ix = mem::replace(&mut self.active_item_index, index);
351 if prev_active_item_ix != self.active_item_index
352 && prev_active_item_ix < self.item_views.len()
353 {
354 self.item_views[prev_active_item_ix].1.deactivated(cx);
355 }
356 self.update_active_toolbar(cx);
357 self.focus_active_item(cx);
358 self.activate(cx);
359 cx.notify();
360 }
361 }
362
363 pub fn activate_prev_item(&mut self, cx: &mut ViewContext<Self>) {
364 let mut index = self.active_item_index;
365 if index > 0 {
366 index -= 1;
367 } else if self.item_views.len() > 0 {
368 index = self.item_views.len() - 1;
369 }
370 self.activate_item(index, cx);
371 }
372
373 pub fn activate_next_item(&mut self, cx: &mut ViewContext<Self>) {
374 let mut index = self.active_item_index;
375 if index + 1 < self.item_views.len() {
376 index += 1;
377 } else {
378 index = 0;
379 }
380 self.activate_item(index, cx);
381 }
382
383 pub fn close_active_item(&mut self, cx: &mut ViewContext<Self>) {
384 if !self.item_views.is_empty() {
385 self.close_item(self.item_views[self.active_item_index].1.id(), cx)
386 }
387 }
388
389 pub fn close_inactive_items(&mut self, cx: &mut ViewContext<Self>) {
390 if !self.item_views.is_empty() {
391 let active_item_id = self.item_views[self.active_item_index].1.id();
392 self.close_items(cx, |id| id != active_item_id);
393 }
394 }
395
396 pub fn close_item(&mut self, view_id_to_close: usize, cx: &mut ViewContext<Self>) {
397 self.close_items(cx, |view_id| view_id == view_id_to_close);
398 }
399
400 pub fn close_items(
401 &mut self,
402 cx: &mut ViewContext<Self>,
403 should_close: impl Fn(usize) -> bool,
404 ) {
405 let mut item_ix = 0;
406 let mut new_active_item_index = self.active_item_index;
407 self.item_views.retain(|(_, item_view)| {
408 if should_close(item_view.id()) {
409 if item_ix == self.active_item_index {
410 item_view.deactivated(cx);
411 }
412
413 if item_ix < self.active_item_index {
414 new_active_item_index -= 1;
415 }
416
417 let mut nav_history = self.nav_history.borrow_mut();
418 if let Some(path) = item_view.project_path(cx) {
419 nav_history.paths_by_item.insert(item_view.id(), path);
420 } else {
421 nav_history.paths_by_item.remove(&item_view.id());
422 }
423
424 item_ix += 1;
425 false
426 } else {
427 item_ix += 1;
428 true
429 }
430 });
431
432 if self.item_views.is_empty() {
433 cx.emit(Event::Remove);
434 } else {
435 self.active_item_index = cmp::min(new_active_item_index, self.item_views.len() - 1);
436 self.focus_active_item(cx);
437 self.activate(cx);
438 }
439 self.update_active_toolbar(cx);
440
441 cx.notify();
442 }
443
444 fn focus_active_item(&mut self, cx: &mut ViewContext<Self>) {
445 if let Some(active_item) = self.active_item() {
446 cx.focus(active_item);
447 }
448 }
449
450 pub fn split(&mut self, direction: SplitDirection, cx: &mut ViewContext<Self>) {
451 cx.emit(Event::Split(direction));
452 }
453
454 pub fn show_toolbar<F, V>(&mut self, cx: &mut ViewContext<Self>, build_toolbar: F)
455 where
456 F: FnOnce(&mut ViewContext<V>) -> V,
457 V: Toolbar,
458 {
459 let type_id = TypeId::of::<V>();
460 if self.active_toolbar_type != Some(type_id) {
461 self.dismiss_toolbar(cx);
462
463 let active_item = self.active_item();
464 self.toolbars
465 .entry(type_id)
466 .or_insert_with(|| Box::new(cx.add_view(build_toolbar)));
467
468 self.active_toolbar_type = Some(type_id);
469 self.active_toolbar_visible =
470 self.toolbars[&type_id].active_item_changed(active_item, cx);
471 cx.notify();
472 }
473 }
474
475 pub fn dismiss_toolbar(&mut self, cx: &mut ViewContext<Self>) {
476 if let Some(active_toolbar_type) = self.active_toolbar_type.take() {
477 self.toolbars
478 .get_mut(&active_toolbar_type)
479 .unwrap()
480 .on_dismiss(cx);
481 self.active_toolbar_visible = false;
482 self.focus_active_item(cx);
483 cx.notify();
484 }
485 }
486
487 pub fn toolbar<T: Toolbar>(&self) -> Option<ViewHandle<T>> {
488 self.toolbars
489 .get(&TypeId::of::<T>())
490 .and_then(|toolbar| toolbar.to_any().downcast())
491 }
492
493 pub fn active_toolbar(&self) -> Option<AnyViewHandle> {
494 let type_id = self.active_toolbar_type?;
495 let toolbar = self.toolbars.get(&type_id)?;
496 if self.active_toolbar_visible {
497 Some(toolbar.to_any())
498 } else {
499 None
500 }
501 }
502
503 fn update_active_toolbar(&mut self, cx: &mut ViewContext<Self>) {
504 let active_item = self.item_views.get(self.active_item_index);
505 for (toolbar_type_id, toolbar) in &self.toolbars {
506 let visible = toolbar.active_item_changed(active_item.map(|i| i.1.clone()), cx);
507 if Some(*toolbar_type_id) == self.active_toolbar_type {
508 self.active_toolbar_visible = visible;
509 }
510 }
511 }
512
513 fn render_tabs(&self, cx: &mut RenderContext<Self>) -> ElementBox {
514 let theme = cx.app_state::<Settings>().theme.clone();
515
516 enum Tabs {}
517 let tabs = MouseEventHandler::new::<Tabs, _, _>(0, cx, |mouse_state, cx| {
518 let mut row = Flex::row();
519 for (ix, (_, item_view)) in self.item_views.iter().enumerate() {
520 let is_active = ix == self.active_item_index;
521
522 row.add_child({
523 let tab_style = if is_active {
524 theme.workspace.active_tab.clone()
525 } else {
526 theme.workspace.tab.clone()
527 };
528 let title = item_view.tab_content(&tab_style, cx);
529
530 let mut style = if is_active {
531 theme.workspace.active_tab.clone()
532 } else {
533 theme.workspace.tab.clone()
534 };
535 if ix == 0 {
536 style.container.border.left = false;
537 }
538
539 EventHandler::new(
540 Container::new(
541 Flex::row()
542 .with_child(
543 Align::new({
544 let diameter = 7.0;
545 let icon_color = if item_view.has_conflict(cx) {
546 Some(style.icon_conflict)
547 } else if item_view.is_dirty(cx) {
548 Some(style.icon_dirty)
549 } else {
550 None
551 };
552
553 ConstrainedBox::new(
554 Canvas::new(move |bounds, _, cx| {
555 if let Some(color) = icon_color {
556 let square = RectF::new(
557 bounds.origin(),
558 vec2f(diameter, diameter),
559 );
560 cx.scene.push_quad(Quad {
561 bounds: square,
562 background: Some(color),
563 border: Default::default(),
564 corner_radius: diameter / 2.,
565 });
566 }
567 })
568 .boxed(),
569 )
570 .with_width(diameter)
571 .with_height(diameter)
572 .boxed()
573 })
574 .boxed(),
575 )
576 .with_child(
577 Container::new(Align::new(title).boxed())
578 .with_style(ContainerStyle {
579 margin: Margin {
580 left: style.spacing,
581 right: style.spacing,
582 ..Default::default()
583 },
584 ..Default::default()
585 })
586 .boxed(),
587 )
588 .with_child(
589 Align::new(
590 ConstrainedBox::new(if mouse_state.hovered {
591 let item_id = item_view.id();
592 enum TabCloseButton {}
593 let icon = Svg::new("icons/x.svg");
594 MouseEventHandler::new::<TabCloseButton, _, _>(
595 item_id,
596 cx,
597 |mouse_state, _| {
598 if mouse_state.hovered {
599 icon.with_color(style.icon_close_active)
600 .boxed()
601 } else {
602 icon.with_color(style.icon_close).boxed()
603 }
604 },
605 )
606 .with_padding(Padding::uniform(4.))
607 .with_cursor_style(CursorStyle::PointingHand)
608 .on_click(move |cx| {
609 cx.dispatch_action(CloseItem(item_id))
610 })
611 .named("close-tab-icon")
612 } else {
613 Empty::new().boxed()
614 })
615 .with_width(style.icon_width)
616 .boxed(),
617 )
618 .boxed(),
619 )
620 .boxed(),
621 )
622 .with_style(style.container)
623 .boxed(),
624 )
625 .on_mouse_down(move |cx| {
626 cx.dispatch_action(ActivateItem(ix));
627 true
628 })
629 .boxed()
630 })
631 }
632
633 row.add_child(
634 Empty::new()
635 .contained()
636 .with_border(theme.workspace.tab.container.border)
637 .flexible(0., true)
638 .named("filler"),
639 );
640
641 row.boxed()
642 });
643
644 ConstrainedBox::new(tabs.boxed())
645 .with_height(theme.workspace.tab.height)
646 .named("tabs")
647 }
648}
649
650impl Entity for Pane {
651 type Event = Event;
652}
653
654impl View for Pane {
655 fn ui_name() -> &'static str {
656 "Pane"
657 }
658
659 fn render(&mut self, cx: &mut RenderContext<Self>) -> ElementBox {
660 let this = cx.handle();
661
662 EventHandler::new(if let Some(active_item) = self.active_item() {
663 Flex::column()
664 .with_child(self.render_tabs(cx))
665 .with_children(
666 self.active_toolbar()
667 .as_ref()
668 .map(|view| ChildView::new(view).boxed()),
669 )
670 .with_child(ChildView::new(active_item).flexible(1., true).boxed())
671 .boxed()
672 } else {
673 Empty::new().boxed()
674 })
675 .on_navigate_mouse_down(move |direction, cx| {
676 let this = this.clone();
677 match direction {
678 NavigationDirection::Back => cx.dispatch_action(GoBack(Some(this))),
679 NavigationDirection::Forward => cx.dispatch_action(GoForward(Some(this))),
680 }
681
682 true
683 })
684 .named("pane")
685 }
686
687 fn on_focus(&mut self, cx: &mut ViewContext<Self>) {
688 self.focus_active_item(cx);
689 }
690}
691
692impl<T: Toolbar> ToolbarHandle for ViewHandle<T> {
693 fn active_item_changed(
694 &self,
695 item: Option<Box<dyn ItemViewHandle>>,
696 cx: &mut MutableAppContext,
697 ) -> bool {
698 self.update(cx, |this, cx| this.active_item_changed(item, cx))
699 }
700
701 fn on_dismiss(&self, cx: &mut MutableAppContext) {
702 self.update(cx, |this, cx| this.on_dismiss(cx));
703 }
704
705 fn to_any(&self) -> AnyViewHandle {
706 self.into()
707 }
708}
709
710impl ItemNavHistory {
711 pub fn new<T: ItemView>(history: Rc<RefCell<NavHistory>>, item_view: &ViewHandle<T>) -> Self {
712 Self {
713 history,
714 item_view: Rc::new(item_view.downgrade()),
715 }
716 }
717
718 pub fn history(&self) -> Rc<RefCell<NavHistory>> {
719 self.history.clone()
720 }
721
722 pub fn push<D: 'static + Any>(&self, data: Option<D>) {
723 self.history.borrow_mut().push(data, self.item_view.clone());
724 }
725}
726
727impl NavHistory {
728 pub fn disable(&mut self) {
729 self.mode = NavigationMode::Disabled;
730 }
731
732 pub fn enable(&mut self) {
733 self.mode = NavigationMode::Normal;
734 }
735
736 pub fn pop_backward(&mut self) -> Option<NavigationEntry> {
737 self.backward_stack.pop_back()
738 }
739
740 pub fn pop_forward(&mut self) -> Option<NavigationEntry> {
741 self.forward_stack.pop_back()
742 }
743
744 fn pop(&mut self, mode: NavigationMode) -> Option<NavigationEntry> {
745 match mode {
746 NavigationMode::Normal | NavigationMode::Disabled => None,
747 NavigationMode::GoingBack => self.pop_backward(),
748 NavigationMode::GoingForward => self.pop_forward(),
749 }
750 }
751
752 fn set_mode(&mut self, mode: NavigationMode) {
753 self.mode = mode;
754 }
755
756 pub fn push<D: 'static + Any>(
757 &mut self,
758 data: Option<D>,
759 item_view: Rc<dyn WeakItemViewHandle>,
760 ) {
761 match self.mode {
762 NavigationMode::Disabled => {}
763 NavigationMode::Normal => {
764 if self.backward_stack.len() >= MAX_NAVIGATION_HISTORY_LEN {
765 self.backward_stack.pop_front();
766 }
767 self.backward_stack.push_back(NavigationEntry {
768 item_view,
769 data: data.map(|data| Box::new(data) as Box<dyn Any>),
770 });
771 self.forward_stack.clear();
772 }
773 NavigationMode::GoingBack => {
774 if self.forward_stack.len() >= MAX_NAVIGATION_HISTORY_LEN {
775 self.forward_stack.pop_front();
776 }
777 self.forward_stack.push_back(NavigationEntry {
778 item_view,
779 data: data.map(|data| Box::new(data) as Box<dyn Any>),
780 });
781 }
782 NavigationMode::GoingForward => {
783 if self.backward_stack.len() >= MAX_NAVIGATION_HISTORY_LEN {
784 self.backward_stack.pop_front();
785 }
786 self.backward_stack.push_back(NavigationEntry {
787 item_view,
788 data: data.map(|data| Box::new(data) as Box<dyn Any>),
789 });
790 }
791 }
792 }
793}