1use super::{ItemHandle, SplitDirection};
2use crate::{Item, Settings, WeakItemHandle, 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::{ProjectEntryId, 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 items: Vec<(Option<ProjectEntryId>, Box<dyn ItemHandle>)>,
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 ItemHandle>>,
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 ItemHandle>>,
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: Rc<dyn WeakItemHandle>,
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: Rc<dyn WeakItemHandle>,
156 pub data: Option<Box<dyn Any>>,
157}
158
159impl Pane {
160 pub fn new() -> Self {
161 Self {
162 items: 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
220 .upgrade(cx)
221 .and_then(|v| pane.index_for_item(v.as_ref()))
222 {
223 if let Some(item) = pane.active_item() {
224 pane.nav_history.borrow_mut().set_mode(mode);
225 item.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.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 task = task.await;
257 if let Some(pane) = pane.upgrade(&cx) {
258 if let Some((project_entry_id, build_item)) = task.log_err() {
259 pane.update(&mut cx, |pane, cx| {
260 pane.nav_history.borrow_mut().set_mode(mode);
261 let item = pane.open_item(project_entry_id, cx, build_item);
262 pane.nav_history
263 .borrow_mut()
264 .set_mode(NavigationMode::Normal);
265 if let Some(data) = entry.data {
266 item.navigate(data, cx);
267 }
268 });
269 } else {
270 workspace
271 .update(&mut cx, |workspace, cx| {
272 Self::navigate_history(workspace, pane, mode, cx)
273 })
274 .await;
275 }
276 }
277 })
278 } else {
279 Task::ready(())
280 }
281 }
282
283 pub fn open_item(
284 &mut self,
285 project_entry_id: ProjectEntryId,
286 cx: &mut ViewContext<Self>,
287 build_item: impl FnOnce(&mut MutableAppContext) -> Box<dyn ItemHandle>,
288 ) -> Box<dyn ItemHandle> {
289 for (ix, (existing_entry_id, item)) in self.items.iter().enumerate() {
290 if *existing_entry_id == Some(project_entry_id) {
291 let item = item.boxed_clone();
292 self.activate_item(ix, cx);
293 return item;
294 }
295 }
296
297 let item = build_item(cx);
298 self.add_item(Some(project_entry_id), item.boxed_clone(), cx);
299 item
300 }
301
302 pub(crate) fn add_item(
303 &mut self,
304 project_entry_id: Option<ProjectEntryId>,
305 mut item: Box<dyn ItemHandle>,
306 cx: &mut ViewContext<Self>,
307 ) {
308 item.set_nav_history(self.nav_history.clone(), cx);
309 item.added_to_pane(cx);
310 let item_idx = cmp::min(self.active_item_index + 1, self.items.len());
311 self.items.insert(item_idx, (project_entry_id, item));
312 self.activate_item(item_idx, cx);
313 cx.notify();
314 }
315
316 pub fn items(&self) -> impl Iterator<Item = &Box<dyn ItemHandle>> {
317 self.items.iter().map(|(_, view)| view)
318 }
319
320 pub fn active_item(&self) -> Option<Box<dyn ItemHandle>> {
321 self.items
322 .get(self.active_item_index)
323 .map(|(_, view)| view.clone())
324 }
325
326 pub fn project_entry_id_for_item(&self, item: &dyn ItemHandle) -> Option<ProjectEntryId> {
327 self.items.iter().find_map(|(entry_id, existing)| {
328 if existing.id() == item.id() {
329 *entry_id
330 } else {
331 None
332 }
333 })
334 }
335
336 pub fn item_for_entry(&self, entry_id: ProjectEntryId) -> Option<Box<dyn ItemHandle>> {
337 self.items.iter().find_map(|(id, view)| {
338 if *id == Some(entry_id) {
339 Some(view.boxed_clone())
340 } else {
341 None
342 }
343 })
344 }
345
346 pub fn index_for_item(&self, item: &dyn ItemHandle) -> Option<usize> {
347 self.items.iter().position(|(_, i)| i.id() == item.id())
348 }
349
350 pub fn activate_item(&mut self, index: usize, cx: &mut ViewContext<Self>) {
351 if index < self.items.len() {
352 let prev_active_item_ix = mem::replace(&mut self.active_item_index, index);
353 if prev_active_item_ix != self.active_item_index
354 && prev_active_item_ix < self.items.len()
355 {
356 self.items[prev_active_item_ix].1.deactivated(cx);
357 }
358 self.update_active_toolbar(cx);
359 self.focus_active_item(cx);
360 self.activate(cx);
361 cx.notify();
362 }
363 }
364
365 pub fn activate_prev_item(&mut self, cx: &mut ViewContext<Self>) {
366 let mut index = self.active_item_index;
367 if index > 0 {
368 index -= 1;
369 } else if self.items.len() > 0 {
370 index = self.items.len() - 1;
371 }
372 self.activate_item(index, cx);
373 }
374
375 pub fn activate_next_item(&mut self, cx: &mut ViewContext<Self>) {
376 let mut index = self.active_item_index;
377 if index + 1 < self.items.len() {
378 index += 1;
379 } else {
380 index = 0;
381 }
382 self.activate_item(index, cx);
383 }
384
385 pub fn close_active_item(&mut self, cx: &mut ViewContext<Self>) {
386 if !self.items.is_empty() {
387 self.close_item(self.items[self.active_item_index].1.id(), cx)
388 }
389 }
390
391 pub fn close_inactive_items(&mut self, cx: &mut ViewContext<Self>) {
392 if !self.items.is_empty() {
393 let active_item_id = self.items[self.active_item_index].1.id();
394 self.close_items(cx, |id| id != active_item_id);
395 }
396 }
397
398 pub fn close_item(&mut self, view_id_to_close: usize, cx: &mut ViewContext<Self>) {
399 self.close_items(cx, |view_id| view_id == view_id_to_close);
400 }
401
402 pub fn close_items(
403 &mut self,
404 cx: &mut ViewContext<Self>,
405 should_close: impl Fn(usize) -> bool,
406 ) {
407 let mut item_ix = 0;
408 let mut new_active_item_index = self.active_item_index;
409 self.items.retain(|(_, item)| {
410 if should_close(item.id()) {
411 if item_ix == self.active_item_index {
412 item.deactivated(cx);
413 }
414
415 if item_ix < self.active_item_index {
416 new_active_item_index -= 1;
417 }
418
419 let mut nav_history = self.nav_history.borrow_mut();
420 if let Some(path) = item.project_path(cx) {
421 nav_history.paths_by_item.insert(item.id(), path);
422 } else {
423 nav_history.paths_by_item.remove(&item.id());
424 }
425
426 item_ix += 1;
427 false
428 } else {
429 item_ix += 1;
430 true
431 }
432 });
433
434 if self.items.is_empty() {
435 cx.emit(Event::Remove);
436 } else {
437 self.active_item_index = cmp::min(new_active_item_index, self.items.len() - 1);
438 self.focus_active_item(cx);
439 self.activate(cx);
440 }
441 self.update_active_toolbar(cx);
442
443 cx.notify();
444 }
445
446 fn focus_active_item(&mut self, cx: &mut ViewContext<Self>) {
447 if let Some(active_item) = self.active_item() {
448 cx.focus(active_item);
449 }
450 }
451
452 pub fn split(&mut self, direction: SplitDirection, cx: &mut ViewContext<Self>) {
453 cx.emit(Event::Split(direction));
454 }
455
456 pub fn show_toolbar<F, V>(&mut self, cx: &mut ViewContext<Self>, build_toolbar: F)
457 where
458 F: FnOnce(&mut ViewContext<V>) -> V,
459 V: Toolbar,
460 {
461 let type_id = TypeId::of::<V>();
462 if self.active_toolbar_type != Some(type_id) {
463 self.dismiss_toolbar(cx);
464
465 let active_item = self.active_item();
466 self.toolbars
467 .entry(type_id)
468 .or_insert_with(|| Box::new(cx.add_view(build_toolbar)));
469
470 self.active_toolbar_type = Some(type_id);
471 self.active_toolbar_visible =
472 self.toolbars[&type_id].active_item_changed(active_item, cx);
473 cx.notify();
474 }
475 }
476
477 pub fn dismiss_toolbar(&mut self, cx: &mut ViewContext<Self>) {
478 if let Some(active_toolbar_type) = self.active_toolbar_type.take() {
479 self.toolbars
480 .get_mut(&active_toolbar_type)
481 .unwrap()
482 .on_dismiss(cx);
483 self.active_toolbar_visible = false;
484 self.focus_active_item(cx);
485 cx.notify();
486 }
487 }
488
489 pub fn toolbar<T: Toolbar>(&self) -> Option<ViewHandle<T>> {
490 self.toolbars
491 .get(&TypeId::of::<T>())
492 .and_then(|toolbar| toolbar.to_any().downcast())
493 }
494
495 pub fn active_toolbar(&self) -> Option<AnyViewHandle> {
496 let type_id = self.active_toolbar_type?;
497 let toolbar = self.toolbars.get(&type_id)?;
498 if self.active_toolbar_visible {
499 Some(toolbar.to_any())
500 } else {
501 None
502 }
503 }
504
505 fn update_active_toolbar(&mut self, cx: &mut ViewContext<Self>) {
506 let active_item = self.items.get(self.active_item_index);
507 for (toolbar_type_id, toolbar) in &self.toolbars {
508 let visible = toolbar.active_item_changed(active_item.map(|i| i.1.clone()), cx);
509 if Some(*toolbar_type_id) == self.active_toolbar_type {
510 self.active_toolbar_visible = visible;
511 }
512 }
513 }
514
515 fn render_tabs(&self, cx: &mut RenderContext<Self>) -> ElementBox {
516 let theme = cx.global::<Settings>().theme.clone();
517
518 enum Tabs {}
519 let tabs = MouseEventHandler::new::<Tabs, _, _>(0, cx, |mouse_state, cx| {
520 let mut row = Flex::row();
521 for (ix, (_, item)) in self.items.iter().enumerate() {
522 let is_active = ix == self.active_item_index;
523
524 row.add_child({
525 let tab_style = if is_active {
526 theme.workspace.active_tab.clone()
527 } else {
528 theme.workspace.tab.clone()
529 };
530 let title = item.tab_content(&tab_style, cx);
531
532 let mut style = if is_active {
533 theme.workspace.active_tab.clone()
534 } else {
535 theme.workspace.tab.clone()
536 };
537 if ix == 0 {
538 style.container.border.left = false;
539 }
540
541 EventHandler::new(
542 Container::new(
543 Flex::row()
544 .with_child(
545 Align::new({
546 let diameter = 7.0;
547 let icon_color = if item.has_conflict(cx) {
548 Some(style.icon_conflict)
549 } else if item.is_dirty(cx) {
550 Some(style.icon_dirty)
551 } else {
552 None
553 };
554
555 ConstrainedBox::new(
556 Canvas::new(move |bounds, _, cx| {
557 if let Some(color) = icon_color {
558 let square = RectF::new(
559 bounds.origin(),
560 vec2f(diameter, diameter),
561 );
562 cx.scene.push_quad(Quad {
563 bounds: square,
564 background: Some(color),
565 border: Default::default(),
566 corner_radius: diameter / 2.,
567 });
568 }
569 })
570 .boxed(),
571 )
572 .with_width(diameter)
573 .with_height(diameter)
574 .boxed()
575 })
576 .boxed(),
577 )
578 .with_child(
579 Container::new(Align::new(title).boxed())
580 .with_style(ContainerStyle {
581 margin: Margin {
582 left: style.spacing,
583 right: style.spacing,
584 ..Default::default()
585 },
586 ..Default::default()
587 })
588 .boxed(),
589 )
590 .with_child(
591 Align::new(
592 ConstrainedBox::new(if mouse_state.hovered {
593 let item_id = item.id();
594 enum TabCloseButton {}
595 let icon = Svg::new("icons/x.svg");
596 MouseEventHandler::new::<TabCloseButton, _, _>(
597 item_id,
598 cx,
599 |mouse_state, _| {
600 if mouse_state.hovered {
601 icon.with_color(style.icon_close_active)
602 .boxed()
603 } else {
604 icon.with_color(style.icon_close).boxed()
605 }
606 },
607 )
608 .with_padding(Padding::uniform(4.))
609 .with_cursor_style(CursorStyle::PointingHand)
610 .on_click(move |cx| {
611 cx.dispatch_action(CloseItem(item_id))
612 })
613 .named("close-tab-icon")
614 } else {
615 Empty::new().boxed()
616 })
617 .with_width(style.icon_width)
618 .boxed(),
619 )
620 .boxed(),
621 )
622 .boxed(),
623 )
624 .with_style(style.container)
625 .boxed(),
626 )
627 .on_mouse_down(move |cx| {
628 cx.dispatch_action(ActivateItem(ix));
629 true
630 })
631 .boxed()
632 })
633 }
634
635 row.add_child(
636 Empty::new()
637 .contained()
638 .with_border(theme.workspace.tab.container.border)
639 .flexible(0., true)
640 .named("filler"),
641 );
642
643 row.boxed()
644 });
645
646 ConstrainedBox::new(tabs.boxed())
647 .with_height(theme.workspace.tab.height)
648 .named("tabs")
649 }
650}
651
652impl Entity for Pane {
653 type Event = Event;
654}
655
656impl View for Pane {
657 fn ui_name() -> &'static str {
658 "Pane"
659 }
660
661 fn render(&mut self, cx: &mut RenderContext<Self>) -> ElementBox {
662 let this = cx.handle();
663
664 EventHandler::new(if let Some(active_item) = self.active_item() {
665 Flex::column()
666 .with_child(self.render_tabs(cx))
667 .with_children(
668 self.active_toolbar()
669 .as_ref()
670 .map(|view| ChildView::new(view).boxed()),
671 )
672 .with_child(ChildView::new(active_item).flexible(1., true).boxed())
673 .boxed()
674 } else {
675 Empty::new().boxed()
676 })
677 .on_navigate_mouse_down(move |direction, cx| {
678 let this = this.clone();
679 match direction {
680 NavigationDirection::Back => cx.dispatch_action(GoBack(Some(this))),
681 NavigationDirection::Forward => cx.dispatch_action(GoForward(Some(this))),
682 }
683
684 true
685 })
686 .named("pane")
687 }
688
689 fn on_focus(&mut self, cx: &mut ViewContext<Self>) {
690 self.focus_active_item(cx);
691 }
692}
693
694impl<T: Toolbar> ToolbarHandle for ViewHandle<T> {
695 fn active_item_changed(
696 &self,
697 item: Option<Box<dyn ItemHandle>>,
698 cx: &mut MutableAppContext,
699 ) -> bool {
700 self.update(cx, |this, cx| this.active_item_changed(item, cx))
701 }
702
703 fn on_dismiss(&self, cx: &mut MutableAppContext) {
704 self.update(cx, |this, cx| this.on_dismiss(cx));
705 }
706
707 fn to_any(&self) -> AnyViewHandle {
708 self.into()
709 }
710}
711
712impl ItemNavHistory {
713 pub fn new<T: Item>(history: Rc<RefCell<NavHistory>>, item: &ViewHandle<T>) -> Self {
714 Self {
715 history,
716 item: Rc::new(item.downgrade()),
717 }
718 }
719
720 pub fn history(&self) -> Rc<RefCell<NavHistory>> {
721 self.history.clone()
722 }
723
724 pub fn push<D: 'static + Any>(&self, data: Option<D>) {
725 self.history.borrow_mut().push(data, self.item.clone());
726 }
727}
728
729impl NavHistory {
730 pub fn disable(&mut self) {
731 self.mode = NavigationMode::Disabled;
732 }
733
734 pub fn enable(&mut self) {
735 self.mode = NavigationMode::Normal;
736 }
737
738 pub fn pop_backward(&mut self) -> Option<NavigationEntry> {
739 self.backward_stack.pop_back()
740 }
741
742 pub fn pop_forward(&mut self) -> Option<NavigationEntry> {
743 self.forward_stack.pop_back()
744 }
745
746 fn pop(&mut self, mode: NavigationMode) -> Option<NavigationEntry> {
747 match mode {
748 NavigationMode::Normal | NavigationMode::Disabled => None,
749 NavigationMode::GoingBack => self.pop_backward(),
750 NavigationMode::GoingForward => self.pop_forward(),
751 }
752 }
753
754 fn set_mode(&mut self, mode: NavigationMode) {
755 self.mode = mode;
756 }
757
758 pub fn push<D: 'static + Any>(&mut self, data: Option<D>, item: Rc<dyn WeakItemHandle>) {
759 match self.mode {
760 NavigationMode::Disabled => {}
761 NavigationMode::Normal => {
762 if self.backward_stack.len() >= MAX_NAVIGATION_HISTORY_LEN {
763 self.backward_stack.pop_front();
764 }
765 self.backward_stack.push_back(NavigationEntry {
766 item,
767 data: data.map(|data| Box::new(data) as Box<dyn Any>),
768 });
769 self.forward_stack.clear();
770 }
771 NavigationMode::GoingBack => {
772 if self.forward_stack.len() >= MAX_NAVIGATION_HISTORY_LEN {
773 self.forward_stack.pop_front();
774 }
775 self.forward_stack.push_back(NavigationEntry {
776 item,
777 data: data.map(|data| Box::new(data) as Box<dyn Any>),
778 });
779 }
780 NavigationMode::GoingForward => {
781 if self.backward_stack.len() >= MAX_NAVIGATION_HISTORY_LEN {
782 self.backward_stack.pop_front();
783 }
784 self.backward_stack.push_back(NavigationEntry {
785 item,
786 data: data.map(|data| Box::new(data) as Box<dyn Any>),
787 });
788 }
789 }
790 }
791}