1use crate::{pane_group::element::pane_axis, AppState, FollowerState, Pane, Workspace};
2use anyhow::{anyhow, Result};
3use call::{ActiveCall, ParticipantLocation};
4use collections::HashMap;
5use gpui::{
6 point, size, AnyWeakView, Axis, Bounds, Entity as _, IntoElement, Model, Pixels, Point, View,
7 ViewContext,
8};
9use parking_lot::Mutex;
10use project::Project;
11use serde::Deserialize;
12use std::sync::Arc;
13use ui::{prelude::*, Button};
14
15const HANDLE_HITBOX_SIZE: f32 = 10.0; //todo!(change this back to 4)
16const HORIZONTAL_MIN_SIZE: f32 = 80.;
17const VERTICAL_MIN_SIZE: f32 = 100.;
18
19#[derive(Clone)]
20pub struct PaneGroup {
21 pub(crate) root: Member,
22}
23
24impl PaneGroup {
25 pub(crate) fn with_root(root: Member) -> Self {
26 Self { root }
27 }
28
29 pub fn new(pane: View<Pane>) -> Self {
30 Self {
31 root: Member::Pane(pane),
32 }
33 }
34
35 pub fn split(
36 &mut self,
37 old_pane: &View<Pane>,
38 new_pane: &View<Pane>,
39 direction: SplitDirection,
40 ) -> Result<()> {
41 match &mut self.root {
42 Member::Pane(pane) => {
43 if pane == old_pane {
44 self.root = Member::new_axis(old_pane.clone(), new_pane.clone(), direction);
45 Ok(())
46 } else {
47 Err(anyhow!("Pane not found"))
48 }
49 }
50 Member::Axis(axis) => axis.split(old_pane, new_pane, direction),
51 }
52 }
53
54 pub fn bounding_box_for_pane(&self, pane: &View<Pane>) -> Option<Bounds<Pixels>> {
55 match &self.root {
56 Member::Pane(_) => None,
57 Member::Axis(axis) => axis.bounding_box_for_pane(pane),
58 }
59 }
60
61 pub fn pane_at_pixel_position(&self, coordinate: Point<Pixels>) -> Option<&View<Pane>> {
62 match &self.root {
63 Member::Pane(pane) => Some(pane),
64 Member::Axis(axis) => axis.pane_at_pixel_position(coordinate),
65 }
66 }
67
68 /// Returns:
69 /// - Ok(true) if it found and removed a pane
70 /// - Ok(false) if it found but did not remove the pane
71 /// - Err(_) if it did not find the pane
72 pub fn remove(&mut self, pane: &View<Pane>) -> Result<bool> {
73 match &mut self.root {
74 Member::Pane(_) => Ok(false),
75 Member::Axis(axis) => {
76 if let Some(last_pane) = axis.remove(pane)? {
77 self.root = last_pane;
78 }
79 Ok(true)
80 }
81 }
82 }
83
84 pub fn swap(&mut self, from: &View<Pane>, to: &View<Pane>) {
85 match &mut self.root {
86 Member::Pane(_) => {}
87 Member::Axis(axis) => axis.swap(from, to),
88 };
89 }
90
91 pub(crate) fn render(
92 &self,
93 project: &Model<Project>,
94 follower_states: &HashMap<View<Pane>, FollowerState>,
95 active_call: Option<&Model<ActiveCall>>,
96 active_pane: &View<Pane>,
97 zoomed: Option<&AnyWeakView>,
98 app_state: &Arc<AppState>,
99 cx: &mut ViewContext<Workspace>,
100 ) -> impl IntoElement {
101 self.root.render(
102 project,
103 0,
104 follower_states,
105 active_call,
106 active_pane,
107 zoomed,
108 app_state,
109 cx,
110 )
111 }
112
113 pub(crate) fn panes(&self) -> Vec<&View<Pane>> {
114 let mut panes = Vec::new();
115 self.root.collect_panes(&mut panes);
116 panes
117 }
118
119 pub(crate) fn first_pane(&self) -> View<Pane> {
120 self.root.first_pane()
121 }
122}
123
124#[derive(Clone)]
125pub(crate) enum Member {
126 Axis(PaneAxis),
127 Pane(View<Pane>),
128}
129
130impl Member {
131 fn new_axis(old_pane: View<Pane>, new_pane: View<Pane>, direction: SplitDirection) -> Self {
132 use Axis::*;
133 use SplitDirection::*;
134
135 let axis = match direction {
136 Up | Down => Vertical,
137 Left | Right => Horizontal,
138 };
139
140 let members = match direction {
141 Up | Left => vec![Member::Pane(new_pane), Member::Pane(old_pane)],
142 Down | Right => vec![Member::Pane(old_pane), Member::Pane(new_pane)],
143 };
144
145 Member::Axis(PaneAxis::new(axis, members))
146 }
147
148 fn contains(&self, needle: &View<Pane>) -> bool {
149 match self {
150 Member::Axis(axis) => axis.members.iter().any(|member| member.contains(needle)),
151 Member::Pane(pane) => pane == needle,
152 }
153 }
154
155 fn first_pane(&self) -> View<Pane> {
156 match self {
157 Member::Axis(axis) => axis.members[0].first_pane(),
158 Member::Pane(pane) => pane.clone(),
159 }
160 }
161
162 pub fn render(
163 &self,
164 project: &Model<Project>,
165 basis: usize,
166 follower_states: &HashMap<View<Pane>, FollowerState>,
167 active_call: Option<&Model<ActiveCall>>,
168 active_pane: &View<Pane>,
169 zoomed: Option<&AnyWeakView>,
170 app_state: &Arc<AppState>,
171 cx: &mut ViewContext<Workspace>,
172 ) -> impl IntoElement {
173 match self {
174 Member::Pane(pane) => {
175 if zoomed == Some(&pane.downgrade().into()) {
176 return div().into_any();
177 }
178
179 let leader = follower_states.get(pane).and_then(|state| {
180 let room = active_call?.read(cx).room()?.read(cx);
181 room.remote_participant_for_peer_id(state.leader_id)
182 });
183
184 let mut leader_border = None;
185 let mut leader_status_box = None;
186 if let Some(leader) = &leader {
187 let mut leader_color = cx
188 .theme()
189 .players()
190 .color_for_participant(leader.participant_index.0)
191 .cursor;
192 leader_color.fade_out(0.3);
193 leader_border = Some(leader_color);
194
195 leader_status_box = match leader.location {
196 ParticipantLocation::SharedProject {
197 project_id: leader_project_id,
198 } => {
199 if Some(leader_project_id) == project.read(cx).remote_id() {
200 None
201 } else {
202 let leader_user = leader.user.clone();
203 let leader_user_id = leader.user.id;
204 Some(
205 Button::new(
206 ("leader-status", pane.entity_id()),
207 format!(
208 "Follow {} to their active project",
209 leader_user.github_login,
210 ),
211 )
212 .on_click(cx.listener(
213 move |this, _, cx| {
214 crate::join_remote_project(
215 leader_project_id,
216 leader_user_id,
217 this.app_state().clone(),
218 cx,
219 )
220 .detach_and_log_err(cx);
221 },
222 )),
223 )
224 }
225 }
226 ParticipantLocation::UnsharedProject => Some(Button::new(
227 ("leader-status", pane.entity_id()),
228 format!(
229 "{} is viewing an unshared Zed project",
230 leader.user.github_login
231 ),
232 )),
233 ParticipantLocation::External => Some(Button::new(
234 ("leader-status", pane.entity_id()),
235 format!(
236 "{} is viewing a window outside of Zed",
237 leader.user.github_login
238 ),
239 )),
240 };
241 }
242
243 div()
244 .relative()
245 .flex_1()
246 .size_full()
247 .child(pane.clone())
248 .when_some(leader_border, |this, color| {
249 this.child(
250 div()
251 .absolute()
252 .size_full()
253 .left_0()
254 .top_0()
255 .border_2()
256 .border_color(color),
257 )
258 })
259 .when_some(leader_status_box, |this, status_box| {
260 this.child(
261 div()
262 .absolute()
263 .w_96()
264 .bottom_3()
265 .right_3()
266 .z_index(1)
267 .child(status_box),
268 )
269 })
270 .into_any()
271
272 // let el = div()
273 // .flex()
274 // .flex_1()
275 // .gap_px()
276 // .w_full()
277 // .h_full()
278 // .bg(cx.theme().colors().editor)
279 // .children();
280 }
281 Member::Axis(axis) => axis
282 .render(
283 project,
284 basis + 1,
285 follower_states,
286 active_call,
287 active_pane,
288 zoomed,
289 app_state,
290 cx,
291 )
292 .into_any(),
293 }
294 }
295
296 fn collect_panes<'a>(&'a self, panes: &mut Vec<&'a View<Pane>>) {
297 match self {
298 Member::Axis(axis) => {
299 for member in &axis.members {
300 member.collect_panes(panes);
301 }
302 }
303 Member::Pane(pane) => panes.push(pane),
304 }
305 }
306}
307
308#[derive(Clone)]
309pub(crate) struct PaneAxis {
310 pub axis: Axis,
311 pub members: Vec<Member>,
312 pub flexes: Arc<Mutex<Vec<f32>>>,
313 pub bounding_boxes: Arc<Mutex<Vec<Option<Bounds<Pixels>>>>>,
314}
315
316impl PaneAxis {
317 pub fn new(axis: Axis, members: Vec<Member>) -> Self {
318 let flexes = Arc::new(Mutex::new(vec![1.; members.len()]));
319 let bounding_boxes = Arc::new(Mutex::new(vec![None; members.len()]));
320 Self {
321 axis,
322 members,
323 flexes,
324 bounding_boxes,
325 }
326 }
327
328 pub fn load(axis: Axis, members: Vec<Member>, flexes: Option<Vec<f32>>) -> Self {
329 let flexes = flexes.unwrap_or_else(|| vec![1.; members.len()]);
330 debug_assert!(members.len() == flexes.len());
331
332 let flexes = Arc::new(Mutex::new(flexes));
333 let bounding_boxes = Arc::new(Mutex::new(vec![None; members.len()]));
334 Self {
335 axis,
336 members,
337 flexes,
338 bounding_boxes,
339 }
340 }
341
342 fn split(
343 &mut self,
344 old_pane: &View<Pane>,
345 new_pane: &View<Pane>,
346 direction: SplitDirection,
347 ) -> Result<()> {
348 for (mut idx, member) in self.members.iter_mut().enumerate() {
349 match member {
350 Member::Axis(axis) => {
351 if axis.split(old_pane, new_pane, direction).is_ok() {
352 return Ok(());
353 }
354 }
355 Member::Pane(pane) => {
356 if pane == old_pane {
357 if direction.axis() == self.axis {
358 if direction.increasing() {
359 idx += 1;
360 }
361
362 self.members.insert(idx, Member::Pane(new_pane.clone()));
363 *self.flexes.lock() = vec![1.; self.members.len()];
364 } else {
365 *member =
366 Member::new_axis(old_pane.clone(), new_pane.clone(), direction);
367 }
368 return Ok(());
369 }
370 }
371 }
372 }
373 Err(anyhow!("Pane not found"))
374 }
375
376 fn remove(&mut self, pane_to_remove: &View<Pane>) -> Result<Option<Member>> {
377 let mut found_pane = false;
378 let mut remove_member = None;
379 for (idx, member) in self.members.iter_mut().enumerate() {
380 match member {
381 Member::Axis(axis) => {
382 if let Ok(last_pane) = axis.remove(pane_to_remove) {
383 if let Some(last_pane) = last_pane {
384 *member = last_pane;
385 }
386 found_pane = true;
387 break;
388 }
389 }
390 Member::Pane(pane) => {
391 if pane == pane_to_remove {
392 found_pane = true;
393 remove_member = Some(idx);
394 break;
395 }
396 }
397 }
398 }
399
400 if found_pane {
401 if let Some(idx) = remove_member {
402 self.members.remove(idx);
403 *self.flexes.lock() = vec![1.; self.members.len()];
404 }
405
406 if self.members.len() == 1 {
407 let result = self.members.pop();
408 *self.flexes.lock() = vec![1.; self.members.len()];
409 Ok(result)
410 } else {
411 Ok(None)
412 }
413 } else {
414 Err(anyhow!("Pane not found"))
415 }
416 }
417
418 fn swap(&mut self, from: &View<Pane>, to: &View<Pane>) {
419 for member in self.members.iter_mut() {
420 match member {
421 Member::Axis(axis) => axis.swap(from, to),
422 Member::Pane(pane) => {
423 if pane == from {
424 *member = Member::Pane(to.clone());
425 } else if pane == to {
426 *member = Member::Pane(from.clone())
427 }
428 }
429 }
430 }
431 }
432
433 fn bounding_box_for_pane(&self, pane: &View<Pane>) -> Option<Bounds<Pixels>> {
434 debug_assert!(self.members.len() == self.bounding_boxes.lock().len());
435
436 for (idx, member) in self.members.iter().enumerate() {
437 match member {
438 Member::Pane(found) => {
439 if pane == found {
440 return self.bounding_boxes.lock()[idx];
441 }
442 }
443 Member::Axis(axis) => {
444 if let Some(rect) = axis.bounding_box_for_pane(pane) {
445 return Some(rect);
446 }
447 }
448 }
449 }
450 None
451 }
452
453 fn pane_at_pixel_position(&self, coordinate: Point<Pixels>) -> Option<&View<Pane>> {
454 debug_assert!(self.members.len() == self.bounding_boxes.lock().len());
455
456 let bounding_boxes = self.bounding_boxes.lock();
457
458 for (idx, member) in self.members.iter().enumerate() {
459 if let Some(coordinates) = bounding_boxes[idx] {
460 if coordinates.contains(&coordinate) {
461 return match member {
462 Member::Pane(found) => Some(found),
463 Member::Axis(axis) => axis.pane_at_pixel_position(coordinate),
464 };
465 }
466 }
467 }
468 None
469 }
470
471 fn render(
472 &self,
473 project: &Model<Project>,
474 basis: usize,
475 follower_states: &HashMap<View<Pane>, FollowerState>,
476 active_call: Option<&Model<ActiveCall>>,
477 active_pane: &View<Pane>,
478 zoomed: Option<&AnyWeakView>,
479 app_state: &Arc<AppState>,
480 cx: &mut ViewContext<Workspace>,
481 ) -> gpui::AnyElement {
482 debug_assert!(self.members.len() == self.flexes.lock().len());
483 let mut active_pane_ix = None;
484
485 pane_axis(
486 self.axis,
487 basis,
488 self.flexes.clone(),
489 self.bounding_boxes.clone(),
490 cx.view().downgrade(),
491 )
492 .children(self.members.iter().enumerate().map(|(ix, member)| {
493 if member.contains(active_pane) {
494 active_pane_ix = Some(ix);
495 }
496 member
497 .render(
498 project,
499 (basis + ix) * 10,
500 follower_states,
501 active_call,
502 active_pane,
503 zoomed,
504 app_state,
505 cx,
506 )
507 .into_any_element()
508 }))
509 .with_active_pane(active_pane_ix)
510 .into_any_element()
511 }
512}
513
514#[derive(Clone, Copy, Debug, Deserialize, PartialEq)]
515pub enum SplitDirection {
516 Up,
517 Down,
518 Left,
519 Right,
520}
521
522impl SplitDirection {
523 pub fn all() -> [Self; 4] {
524 [Self::Up, Self::Down, Self::Left, Self::Right]
525 }
526
527 pub fn edge(&self, rect: Bounds<Pixels>) -> Pixels {
528 match self {
529 Self::Up => rect.origin.y,
530 Self::Down => rect.lower_left().y,
531 Self::Left => rect.lower_left().x,
532 Self::Right => rect.lower_right().x,
533 }
534 }
535
536 pub fn along_edge(&self, bounds: Bounds<Pixels>, length: Pixels) -> Bounds<Pixels> {
537 match self {
538 Self::Up => Bounds {
539 origin: bounds.origin,
540 size: size(bounds.size.width, length),
541 },
542 Self::Down => Bounds {
543 origin: point(bounds.lower_left().x, bounds.lower_left().y - length),
544 size: size(bounds.size.width, length),
545 },
546 Self::Left => Bounds {
547 origin: bounds.origin,
548 size: size(length, bounds.size.height),
549 },
550 Self::Right => Bounds {
551 origin: point(bounds.lower_right().x - length, bounds.lower_left().y),
552 size: size(length, bounds.size.height),
553 },
554 }
555 }
556
557 pub fn axis(&self) -> Axis {
558 match self {
559 Self::Up | Self::Down => Axis::Vertical,
560 Self::Left | Self::Right => Axis::Horizontal,
561 }
562 }
563
564 pub fn increasing(&self) -> bool {
565 match self {
566 Self::Left | Self::Up => false,
567 Self::Down | Self::Right => true,
568 }
569 }
570}
571
572mod element {
573
574 use std::{cell::RefCell, iter, rc::Rc, sync::Arc};
575
576 use gpui::{
577 px, relative, Along, AnyElement, Axis, Bounds, CursorStyle, Element, InteractiveBounds,
578 IntoElement, MouseDownEvent, MouseMoveEvent, MouseUpEvent, ParentElement, Pixels, Point,
579 Size, Style, WeakView, WindowContext,
580 };
581 use parking_lot::Mutex;
582 use smallvec::SmallVec;
583 use ui::prelude::*;
584 use util::ResultExt;
585
586 use crate::Workspace;
587
588 use super::{HANDLE_HITBOX_SIZE, HORIZONTAL_MIN_SIZE, VERTICAL_MIN_SIZE};
589
590 const DIVIDER_SIZE: f32 = 1.0;
591
592 pub(super) fn pane_axis(
593 axis: Axis,
594 basis: usize,
595 flexes: Arc<Mutex<Vec<f32>>>,
596 bounding_boxes: Arc<Mutex<Vec<Option<Bounds<Pixels>>>>>,
597 workspace: WeakView<Workspace>,
598 ) -> PaneAxisElement {
599 PaneAxisElement {
600 axis,
601 basis,
602 flexes,
603 bounding_boxes,
604 children: SmallVec::new(),
605 active_pane_ix: None,
606 workspace,
607 }
608 }
609
610 pub struct PaneAxisElement {
611 axis: Axis,
612 basis: usize,
613 flexes: Arc<Mutex<Vec<f32>>>,
614 bounding_boxes: Arc<Mutex<Vec<Option<Bounds<Pixels>>>>>,
615 children: SmallVec<[AnyElement; 2]>,
616 active_pane_ix: Option<usize>,
617 workspace: WeakView<Workspace>,
618 }
619
620 impl PaneAxisElement {
621 pub fn with_active_pane(mut self, active_pane_ix: Option<usize>) -> Self {
622 self.active_pane_ix = active_pane_ix;
623 self
624 }
625
626 fn compute_resize(
627 flexes: &Arc<Mutex<Vec<f32>>>,
628 e: &MouseMoveEvent,
629 ix: usize,
630 axis: Axis,
631 child_start: Point<Pixels>,
632 container_size: Size<Pixels>,
633 workspace: WeakView<Workspace>,
634 cx: &mut WindowContext,
635 ) {
636 let min_size = match axis {
637 Axis::Horizontal => px(HORIZONTAL_MIN_SIZE),
638 Axis::Vertical => px(VERTICAL_MIN_SIZE),
639 };
640 let mut flexes = flexes.lock();
641 debug_assert!(flex_values_in_bounds(flexes.as_slice()));
642
643 let size = move |ix, flexes: &[f32]| {
644 container_size.along(axis) * (flexes[ix] / flexes.len() as f32)
645 };
646
647 // Don't allow resizing to less than the minimum size, if elements are already too small
648 if min_size - px(1.) > size(ix, flexes.as_slice()) {
649 return;
650 }
651
652 let mut proposed_current_pixel_change =
653 (e.position - child_start).along(axis) - size(ix, flexes.as_slice());
654
655 let flex_changes = |pixel_dx, target_ix, next: isize, flexes: &[f32]| {
656 let flex_change = pixel_dx / container_size.along(axis);
657 let current_target_flex = flexes[target_ix] + flex_change;
658 let next_target_flex = flexes[(target_ix as isize + next) as usize] - flex_change;
659 (current_target_flex, next_target_flex)
660 };
661
662 let mut successors = iter::from_fn({
663 let forward = proposed_current_pixel_change > px(0.);
664 let mut ix_offset = 0;
665 let len = flexes.len();
666 move || {
667 let result = if forward {
668 (ix + 1 + ix_offset < len).then(|| ix + ix_offset)
669 } else {
670 (ix as isize - ix_offset as isize >= 0).then(|| ix - ix_offset)
671 };
672
673 ix_offset += 1;
674
675 result
676 }
677 });
678
679 while proposed_current_pixel_change.abs() > px(0.) {
680 let Some(current_ix) = successors.next() else {
681 break;
682 };
683
684 let next_target_size = Pixels::max(
685 size(current_ix + 1, flexes.as_slice()) - proposed_current_pixel_change,
686 min_size,
687 );
688
689 let current_target_size = Pixels::max(
690 size(current_ix, flexes.as_slice()) + size(current_ix + 1, flexes.as_slice())
691 - next_target_size,
692 min_size,
693 );
694
695 let current_pixel_change =
696 current_target_size - size(current_ix, flexes.as_slice());
697
698 let (current_target_flex, next_target_flex) =
699 flex_changes(current_pixel_change, current_ix, 1, flexes.as_slice());
700
701 flexes[current_ix] = current_target_flex;
702 flexes[current_ix + 1] = next_target_flex;
703
704 proposed_current_pixel_change -= current_pixel_change;
705 }
706
707 // todo!(schedule serialize)
708 workspace
709 .update(cx, |this, cx| this.schedule_serialize(cx))
710 .log_err();
711 cx.notify();
712 }
713
714 fn push_handle(
715 flexes: Arc<Mutex<Vec<f32>>>,
716 dragged_handle: Rc<RefCell<Option<usize>>>,
717 axis: Axis,
718 ix: usize,
719 pane_bounds: Bounds<Pixels>,
720 axis_bounds: Bounds<Pixels>,
721 workspace: WeakView<Workspace>,
722 cx: &mut WindowContext,
723 ) {
724 let handle_bounds = Bounds {
725 origin: pane_bounds.origin.apply_along(axis, |origin| {
726 origin + pane_bounds.size.along(axis) - px(HANDLE_HITBOX_SIZE / 2.)
727 }),
728 size: pane_bounds
729 .size
730 .apply_along(axis, |_| px(HANDLE_HITBOX_SIZE)),
731 };
732 let divider_bounds = Bounds {
733 origin: pane_bounds
734 .origin
735 .apply_along(axis, |origin| origin + pane_bounds.size.along(axis)),
736 size: pane_bounds.size.apply_along(axis, |_| px(DIVIDER_SIZE)),
737 };
738
739 cx.with_z_index(3, |cx| {
740 let interactive_handle_bounds = InteractiveBounds {
741 bounds: handle_bounds,
742 stacking_order: cx.stacking_order().clone(),
743 };
744 if interactive_handle_bounds.visibly_contains(&cx.mouse_position(), cx) {
745 cx.set_cursor_style(match axis {
746 Axis::Vertical => CursorStyle::ResizeUpDown,
747 Axis::Horizontal => CursorStyle::ResizeLeftRight,
748 })
749 }
750
751 cx.add_opaque_layer(handle_bounds);
752 cx.paint_quad(gpui::fill(divider_bounds, cx.theme().colors().border));
753
754 cx.on_mouse_event({
755 let dragged_handle = dragged_handle.clone();
756 let flexes = flexes.clone();
757 let workspace = workspace.clone();
758 move |e: &MouseDownEvent, phase, cx| {
759 if phase.bubble() && handle_bounds.contains(&e.position) {
760 dragged_handle.replace(Some(ix));
761 if e.click_count >= 2 {
762 let mut borrow = flexes.lock();
763 *borrow = vec![1.; borrow.len()];
764 workspace
765 .update(cx, |this, cx| this.schedule_serialize(cx))
766 .log_err();
767 cx.notify();
768 }
769 }
770 }
771 });
772 cx.on_mouse_event({
773 let workspace = workspace.clone();
774 move |e: &MouseMoveEvent, phase, cx| {
775 let dragged_handle = dragged_handle.borrow();
776
777 if phase.bubble() && *dragged_handle == Some(ix) {
778 Self::compute_resize(
779 &flexes,
780 e,
781 ix,
782 axis,
783 pane_bounds.origin,
784 axis_bounds.size,
785 workspace.clone(),
786 cx,
787 )
788 }
789 }
790 });
791 });
792 }
793 }
794
795 impl IntoElement for PaneAxisElement {
796 type Element = Self;
797
798 fn element_id(&self) -> Option<ui::prelude::ElementId> {
799 Some(self.basis.into())
800 }
801
802 fn into_element(self) -> Self::Element {
803 self
804 }
805 }
806
807 impl Element for PaneAxisElement {
808 type State = Rc<RefCell<Option<usize>>>;
809
810 fn request_layout(
811 &mut self,
812 state: Option<Self::State>,
813 cx: &mut ui::prelude::WindowContext,
814 ) -> (gpui::LayoutId, Self::State) {
815 let mut style = Style::default();
816 style.flex_grow = 1.;
817 style.flex_shrink = 1.;
818 style.flex_basis = relative(0.).into();
819 style.size.width = relative(1.).into();
820 style.size.height = relative(1.).into();
821 let layout_id = cx.request_layout(&style, None);
822 let dragged_pane = state.unwrap_or_else(|| Rc::new(RefCell::new(None)));
823 (layout_id, dragged_pane)
824 }
825
826 fn paint(
827 &mut self,
828 bounds: gpui::Bounds<ui::prelude::Pixels>,
829 state: &mut Self::State,
830 cx: &mut ui::prelude::WindowContext,
831 ) {
832 let flexes = self.flexes.lock().clone();
833 let len = self.children.len();
834 debug_assert!(flexes.len() == len);
835 debug_assert!(flex_values_in_bounds(flexes.as_slice()));
836
837 let mut origin = bounds.origin;
838 let space_per_flex = bounds.size.along(self.axis) / len as f32;
839
840 let mut bounding_boxes = self.bounding_boxes.lock();
841 bounding_boxes.clear();
842
843 for (ix, child) in self.children.iter_mut().enumerate() {
844 //todo!(active_pane_magnification)
845 // If using active pane magnification, need to switch to using
846 // 1 for all non-active panes, and then the magnification for the
847 // active pane.
848 let child_size = bounds
849 .size
850 .apply_along(self.axis, |_| space_per_flex * flexes[ix]);
851
852 let child_bounds = Bounds {
853 origin,
854 size: child_size,
855 };
856 bounding_boxes.push(Some(child_bounds));
857 cx.with_z_index(0, |cx| {
858 child.draw(origin, child_size.into(), cx);
859 });
860 cx.with_z_index(1, |cx| {
861 if ix < len - 1 {
862 Self::push_handle(
863 self.flexes.clone(),
864 state.clone(),
865 self.axis,
866 ix,
867 child_bounds,
868 bounds,
869 self.workspace.clone(),
870 cx,
871 );
872 }
873 });
874
875 origin = origin.apply_along(self.axis, |val| val + child_size.along(self.axis));
876 }
877
878 cx.with_z_index(1, |cx| {
879 cx.on_mouse_event({
880 let state = state.clone();
881 move |_: &MouseUpEvent, phase, _cx| {
882 if phase.bubble() {
883 state.replace(None);
884 }
885 }
886 });
887 })
888 }
889 }
890
891 impl ParentElement for PaneAxisElement {
892 fn children_mut(&mut self) -> &mut smallvec::SmallVec<[AnyElement; 2]> {
893 &mut self.children
894 }
895 }
896
897 fn flex_values_in_bounds(flexes: &[f32]) -> bool {
898 (flexes.iter().copied().sum::<f32>() - flexes.len() as f32).abs() < 0.001
899 }
900}