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 )
491 .children(self.members.iter().enumerate().map(|(ix, member)| {
492 if member.contains(active_pane) {
493 active_pane_ix = Some(ix);
494 }
495 member
496 .render(
497 project,
498 (basis + ix) * 10,
499 follower_states,
500 active_call,
501 active_pane,
502 zoomed,
503 app_state,
504 cx,
505 )
506 .into_any_element()
507 }))
508 .with_active_pane(active_pane_ix)
509 .into_any_element()
510 }
511}
512
513#[derive(Clone, Copy, Debug, Deserialize, PartialEq)]
514pub enum SplitDirection {
515 Up,
516 Down,
517 Left,
518 Right,
519}
520
521impl SplitDirection {
522 pub fn all() -> [Self; 4] {
523 [Self::Up, Self::Down, Self::Left, Self::Right]
524 }
525
526 pub fn edge(&self, rect: Bounds<Pixels>) -> Pixels {
527 match self {
528 Self::Up => rect.origin.y,
529 Self::Down => rect.lower_left().y,
530 Self::Left => rect.lower_left().x,
531 Self::Right => rect.lower_right().x,
532 }
533 }
534
535 pub fn along_edge(&self, bounds: Bounds<Pixels>, length: Pixels) -> Bounds<Pixels> {
536 match self {
537 Self::Up => Bounds {
538 origin: bounds.origin,
539 size: size(bounds.size.width, length),
540 },
541 Self::Down => Bounds {
542 origin: point(bounds.lower_left().x, bounds.lower_left().y - length),
543 size: size(bounds.size.width, length),
544 },
545 Self::Left => Bounds {
546 origin: bounds.origin,
547 size: size(length, bounds.size.height),
548 },
549 Self::Right => Bounds {
550 origin: point(bounds.lower_right().x - length, bounds.lower_left().y),
551 size: size(length, bounds.size.height),
552 },
553 }
554 }
555
556 pub fn axis(&self) -> Axis {
557 match self {
558 Self::Up | Self::Down => Axis::Vertical,
559 Self::Left | Self::Right => Axis::Horizontal,
560 }
561 }
562
563 pub fn increasing(&self) -> bool {
564 match self {
565 Self::Left | Self::Up => false,
566 Self::Down | Self::Right => true,
567 }
568 }
569}
570
571mod element {
572
573 use std::{cell::RefCell, iter, rc::Rc, sync::Arc};
574
575 use gpui::{
576 px, relative, Along, AnyElement, Axis, Bounds, CursorStyle, Element, InteractiveBounds,
577 IntoElement, MouseDownEvent, MouseMoveEvent, MouseUpEvent, ParentElement, Pixels, Point,
578 Size, Style, WindowContext,
579 };
580 use parking_lot::Mutex;
581 use smallvec::SmallVec;
582 use ui::prelude::*;
583
584 use super::{HANDLE_HITBOX_SIZE, HORIZONTAL_MIN_SIZE, VERTICAL_MIN_SIZE};
585
586 const DIVIDER_SIZE: f32 = 1.0;
587
588 pub fn pane_axis(
589 axis: Axis,
590 basis: usize,
591 flexes: Arc<Mutex<Vec<f32>>>,
592 bounding_boxes: Arc<Mutex<Vec<Option<Bounds<Pixels>>>>>,
593 ) -> PaneAxisElement {
594 PaneAxisElement {
595 axis,
596 basis,
597 flexes,
598 bounding_boxes,
599 children: SmallVec::new(),
600 active_pane_ix: None,
601 }
602 }
603
604 pub struct PaneAxisElement {
605 axis: Axis,
606 basis: usize,
607 flexes: Arc<Mutex<Vec<f32>>>,
608 bounding_boxes: Arc<Mutex<Vec<Option<Bounds<Pixels>>>>>,
609 children: SmallVec<[AnyElement; 2]>,
610 active_pane_ix: Option<usize>,
611 }
612
613 impl PaneAxisElement {
614 pub fn with_active_pane(mut self, active_pane_ix: Option<usize>) -> Self {
615 self.active_pane_ix = active_pane_ix;
616 self
617 }
618
619 fn compute_resize(
620 flexes: &Arc<Mutex<Vec<f32>>>,
621 e: &MouseMoveEvent,
622 ix: usize,
623 axis: Axis,
624 child_start: Point<Pixels>,
625 container_size: Size<Pixels>,
626 cx: &mut WindowContext,
627 ) {
628 let min_size = match axis {
629 Axis::Horizontal => px(HORIZONTAL_MIN_SIZE),
630 Axis::Vertical => px(VERTICAL_MIN_SIZE),
631 };
632 let mut flexes = flexes.lock();
633 debug_assert!(flex_values_in_bounds(flexes.as_slice()));
634
635 let size = move |ix, flexes: &[f32]| {
636 container_size.along(axis) * (flexes[ix] / flexes.len() as f32)
637 };
638
639 // Don't allow resizing to less than the minimum size, if elements are already too small
640 if min_size - px(1.) > size(ix, flexes.as_slice()) {
641 return;
642 }
643
644 let mut proposed_current_pixel_change =
645 (e.position - child_start).along(axis) - size(ix, flexes.as_slice());
646
647 let flex_changes = |pixel_dx, target_ix, next: isize, flexes: &[f32]| {
648 let flex_change = pixel_dx / container_size.along(axis);
649 let current_target_flex = flexes[target_ix] + flex_change;
650 let next_target_flex = flexes[(target_ix as isize + next) as usize] - flex_change;
651 (current_target_flex, next_target_flex)
652 };
653
654 let mut successors = iter::from_fn({
655 let forward = proposed_current_pixel_change > px(0.);
656 let mut ix_offset = 0;
657 let len = flexes.len();
658 move || {
659 let result = if forward {
660 (ix + 1 + ix_offset < len).then(|| ix + ix_offset)
661 } else {
662 (ix as isize - ix_offset as isize >= 0).then(|| ix - ix_offset)
663 };
664
665 ix_offset += 1;
666
667 result
668 }
669 });
670
671 while proposed_current_pixel_change.abs() > px(0.) {
672 let Some(current_ix) = successors.next() else {
673 break;
674 };
675
676 let next_target_size = Pixels::max(
677 size(current_ix + 1, flexes.as_slice()) - proposed_current_pixel_change,
678 min_size,
679 );
680
681 let current_target_size = Pixels::max(
682 size(current_ix, flexes.as_slice()) + size(current_ix + 1, flexes.as_slice())
683 - next_target_size,
684 min_size,
685 );
686
687 let current_pixel_change =
688 current_target_size - size(current_ix, flexes.as_slice());
689
690 let (current_target_flex, next_target_flex) =
691 flex_changes(current_pixel_change, current_ix, 1, flexes.as_slice());
692
693 flexes[current_ix] = current_target_flex;
694 flexes[current_ix + 1] = next_target_flex;
695
696 proposed_current_pixel_change -= current_pixel_change;
697 }
698
699 // todo!(schedule serialize)
700 // workspace.schedule_serialize(cx);
701 cx.notify();
702 }
703
704 fn push_handle(
705 flexes: Arc<Mutex<Vec<f32>>>,
706 dragged_handle: Rc<RefCell<Option<usize>>>,
707 axis: Axis,
708 ix: usize,
709 pane_bounds: Bounds<Pixels>,
710 axis_bounds: Bounds<Pixels>,
711 cx: &mut WindowContext,
712 ) {
713 let handle_bounds = Bounds {
714 origin: pane_bounds.origin.apply_along(axis, |origin| {
715 origin + pane_bounds.size.along(axis) - px(HANDLE_HITBOX_SIZE / 2.)
716 }),
717 size: pane_bounds
718 .size
719 .apply_along(axis, |_| px(HANDLE_HITBOX_SIZE)),
720 };
721 let divider_bounds = Bounds {
722 origin: pane_bounds
723 .origin
724 .apply_along(axis, |origin| origin + pane_bounds.size.along(axis)),
725 size: pane_bounds.size.apply_along(axis, |_| px(DIVIDER_SIZE)),
726 };
727
728 cx.with_z_index(3, |cx| {
729 let interactive_handle_bounds = InteractiveBounds {
730 bounds: handle_bounds,
731 stacking_order: cx.stacking_order().clone(),
732 };
733 if interactive_handle_bounds.visibly_contains(&cx.mouse_position(), cx) {
734 cx.set_cursor_style(match axis {
735 Axis::Vertical => CursorStyle::ResizeUpDown,
736 Axis::Horizontal => CursorStyle::ResizeLeftRight,
737 })
738 }
739
740 cx.add_opaque_layer(handle_bounds);
741 cx.paint_quad(gpui::fill(divider_bounds, cx.theme().colors().border));
742
743 cx.on_mouse_event({
744 let dragged_handle = dragged_handle.clone();
745 move |e: &MouseDownEvent, phase, _cx| {
746 if phase.bubble() && handle_bounds.contains(&e.position) {
747 dragged_handle.replace(Some(ix));
748 }
749 }
750 });
751 cx.on_mouse_event(move |e: &MouseMoveEvent, phase, cx| {
752 let dragged_handle = dragged_handle.borrow();
753 if phase.bubble() && *dragged_handle == Some(ix) {
754 Self::compute_resize(
755 &flexes,
756 e,
757 ix,
758 axis,
759 pane_bounds.origin,
760 axis_bounds.size,
761 cx,
762 )
763 }
764 });
765 });
766 }
767 }
768
769 impl IntoElement for PaneAxisElement {
770 type Element = Self;
771
772 fn element_id(&self) -> Option<ui::prelude::ElementId> {
773 Some(self.basis.into())
774 }
775
776 fn into_element(self) -> Self::Element {
777 self
778 }
779 }
780
781 impl Element for PaneAxisElement {
782 type State = Rc<RefCell<Option<usize>>>;
783
784 fn request_layout(
785 &mut self,
786 state: Option<Self::State>,
787 cx: &mut ui::prelude::WindowContext,
788 ) -> (gpui::LayoutId, Self::State) {
789 let mut style = Style::default();
790 style.flex_grow = 1.;
791 style.flex_shrink = 1.;
792 style.flex_basis = relative(0.).into();
793 style.size.width = relative(1.).into();
794 style.size.height = relative(1.).into();
795 let layout_id = cx.request_layout(&style, None);
796 let dragged_pane = state.unwrap_or_else(|| Rc::new(RefCell::new(None)));
797 (layout_id, dragged_pane)
798 }
799
800 fn paint(
801 &mut self,
802 bounds: gpui::Bounds<ui::prelude::Pixels>,
803 state: &mut Self::State,
804 cx: &mut ui::prelude::WindowContext,
805 ) {
806 let flexes = self.flexes.lock().clone();
807 let len = self.children.len();
808 debug_assert!(flexes.len() == len);
809 debug_assert!(flex_values_in_bounds(flexes.as_slice()));
810
811 let mut origin = bounds.origin;
812 let space_per_flex = bounds.size.along(self.axis) / len as f32;
813
814 let mut bounding_boxes = self.bounding_boxes.lock();
815 bounding_boxes.clear();
816
817 for (ix, child) in self.children.iter_mut().enumerate() {
818 //todo!(active_pane_magnification)
819 // If using active pane magnification, need to switch to using
820 // 1 for all non-active panes, and then the magnification for the
821 // active pane.
822 let child_size = bounds
823 .size
824 .apply_along(self.axis, |_| space_per_flex * flexes[ix]);
825
826 let child_bounds = Bounds {
827 origin,
828 size: child_size,
829 };
830 bounding_boxes.push(Some(child_bounds));
831 cx.with_z_index(0, |cx| {
832 child.draw(origin, child_size.into(), cx);
833 });
834 cx.with_z_index(1, |cx| {
835 if ix < len - 1 {
836 Self::push_handle(
837 self.flexes.clone(),
838 state.clone(),
839 self.axis,
840 ix,
841 child_bounds,
842 bounds,
843 cx,
844 );
845 }
846 });
847
848 origin = origin.apply_along(self.axis, |val| val + child_size.along(self.axis));
849 }
850
851 cx.with_z_index(1, |cx| {
852 cx.on_mouse_event({
853 let state = state.clone();
854 move |_: &MouseUpEvent, phase, _cx| {
855 if phase.bubble() {
856 state.replace(None);
857 }
858 }
859 });
860 })
861 }
862 }
863
864 impl ParentElement for PaneAxisElement {
865 fn children_mut(&mut self) -> &mut smallvec::SmallVec<[AnyElement; 2]> {
866 &mut self.children
867 }
868 }
869
870 fn flex_values_in_bounds(flexes: &[f32]) -> bool {
871 (flexes.iter().copied().sum::<f32>() - flexes.len() as f32).abs() < 0.001
872 }
873}