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
15pub const HANDLE_HITBOX_SIZE: f32 = 4.0;
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 Member::Axis(axis) => axis
273 .render(
274 project,
275 basis + 1,
276 follower_states,
277 active_call,
278 active_pane,
279 zoomed,
280 app_state,
281 cx,
282 )
283 .into_any(),
284 }
285 }
286
287 fn collect_panes<'a>(&'a self, panes: &mut Vec<&'a View<Pane>>) {
288 match self {
289 Member::Axis(axis) => {
290 for member in &axis.members {
291 member.collect_panes(panes);
292 }
293 }
294 Member::Pane(pane) => panes.push(pane),
295 }
296 }
297}
298
299#[derive(Clone)]
300pub(crate) struct PaneAxis {
301 pub axis: Axis,
302 pub members: Vec<Member>,
303 pub flexes: Arc<Mutex<Vec<f32>>>,
304 pub bounding_boxes: Arc<Mutex<Vec<Option<Bounds<Pixels>>>>>,
305}
306
307impl PaneAxis {
308 pub fn new(axis: Axis, members: Vec<Member>) -> Self {
309 let flexes = Arc::new(Mutex::new(vec![1.; members.len()]));
310 let bounding_boxes = Arc::new(Mutex::new(vec![None; members.len()]));
311 Self {
312 axis,
313 members,
314 flexes,
315 bounding_boxes,
316 }
317 }
318
319 pub fn load(axis: Axis, members: Vec<Member>, flexes: Option<Vec<f32>>) -> Self {
320 let flexes = flexes.unwrap_or_else(|| vec![1.; members.len()]);
321 debug_assert!(members.len() == flexes.len());
322
323 let flexes = Arc::new(Mutex::new(flexes));
324 let bounding_boxes = Arc::new(Mutex::new(vec![None; members.len()]));
325 Self {
326 axis,
327 members,
328 flexes,
329 bounding_boxes,
330 }
331 }
332
333 fn split(
334 &mut self,
335 old_pane: &View<Pane>,
336 new_pane: &View<Pane>,
337 direction: SplitDirection,
338 ) -> Result<()> {
339 for (mut idx, member) in self.members.iter_mut().enumerate() {
340 match member {
341 Member::Axis(axis) => {
342 if axis.split(old_pane, new_pane, direction).is_ok() {
343 return Ok(());
344 }
345 }
346 Member::Pane(pane) => {
347 if pane == old_pane {
348 if direction.axis() == self.axis {
349 if direction.increasing() {
350 idx += 1;
351 }
352
353 self.members.insert(idx, Member::Pane(new_pane.clone()));
354 *self.flexes.lock() = vec![1.; self.members.len()];
355 } else {
356 *member =
357 Member::new_axis(old_pane.clone(), new_pane.clone(), direction);
358 }
359 return Ok(());
360 }
361 }
362 }
363 }
364 Err(anyhow!("Pane not found"))
365 }
366
367 fn remove(&mut self, pane_to_remove: &View<Pane>) -> Result<Option<Member>> {
368 let mut found_pane = false;
369 let mut remove_member = None;
370 for (idx, member) in self.members.iter_mut().enumerate() {
371 match member {
372 Member::Axis(axis) => {
373 if let Ok(last_pane) = axis.remove(pane_to_remove) {
374 if let Some(last_pane) = last_pane {
375 *member = last_pane;
376 }
377 found_pane = true;
378 break;
379 }
380 }
381 Member::Pane(pane) => {
382 if pane == pane_to_remove {
383 found_pane = true;
384 remove_member = Some(idx);
385 break;
386 }
387 }
388 }
389 }
390
391 if found_pane {
392 if let Some(idx) = remove_member {
393 self.members.remove(idx);
394 *self.flexes.lock() = vec![1.; self.members.len()];
395 }
396
397 if self.members.len() == 1 {
398 let result = self.members.pop();
399 *self.flexes.lock() = vec![1.; self.members.len()];
400 Ok(result)
401 } else {
402 Ok(None)
403 }
404 } else {
405 Err(anyhow!("Pane not found"))
406 }
407 }
408
409 fn swap(&mut self, from: &View<Pane>, to: &View<Pane>) {
410 for member in self.members.iter_mut() {
411 match member {
412 Member::Axis(axis) => axis.swap(from, to),
413 Member::Pane(pane) => {
414 if pane == from {
415 *member = Member::Pane(to.clone());
416 } else if pane == to {
417 *member = Member::Pane(from.clone())
418 }
419 }
420 }
421 }
422 }
423
424 fn bounding_box_for_pane(&self, pane: &View<Pane>) -> Option<Bounds<Pixels>> {
425 debug_assert!(self.members.len() == self.bounding_boxes.lock().len());
426
427 for (idx, member) in self.members.iter().enumerate() {
428 match member {
429 Member::Pane(found) => {
430 if pane == found {
431 return self.bounding_boxes.lock()[idx];
432 }
433 }
434 Member::Axis(axis) => {
435 if let Some(rect) = axis.bounding_box_for_pane(pane) {
436 return Some(rect);
437 }
438 }
439 }
440 }
441 None
442 }
443
444 fn pane_at_pixel_position(&self, coordinate: Point<Pixels>) -> Option<&View<Pane>> {
445 debug_assert!(self.members.len() == self.bounding_boxes.lock().len());
446
447 let bounding_boxes = self.bounding_boxes.lock();
448
449 for (idx, member) in self.members.iter().enumerate() {
450 if let Some(coordinates) = bounding_boxes[idx] {
451 if coordinates.contains(&coordinate) {
452 return match member {
453 Member::Pane(found) => Some(found),
454 Member::Axis(axis) => axis.pane_at_pixel_position(coordinate),
455 };
456 }
457 }
458 }
459 None
460 }
461
462 fn render(
463 &self,
464 project: &Model<Project>,
465 basis: usize,
466 follower_states: &HashMap<View<Pane>, FollowerState>,
467 active_call: Option<&Model<ActiveCall>>,
468 active_pane: &View<Pane>,
469 zoomed: Option<&AnyWeakView>,
470 app_state: &Arc<AppState>,
471 cx: &mut ViewContext<Workspace>,
472 ) -> gpui::AnyElement {
473 debug_assert!(self.members.len() == self.flexes.lock().len());
474 let mut active_pane_ix = None;
475
476 pane_axis(
477 self.axis,
478 basis,
479 self.flexes.clone(),
480 self.bounding_boxes.clone(),
481 cx.view().downgrade(),
482 )
483 .children(self.members.iter().enumerate().map(|(ix, member)| {
484 if member.contains(active_pane) {
485 active_pane_ix = Some(ix);
486 }
487 member
488 .render(
489 project,
490 (basis + ix) * 10,
491 follower_states,
492 active_call,
493 active_pane,
494 zoomed,
495 app_state,
496 cx,
497 )
498 .into_any_element()
499 }))
500 .with_active_pane(active_pane_ix)
501 .into_any_element()
502 }
503}
504
505#[derive(Clone, Copy, Debug, Deserialize, PartialEq)]
506pub enum SplitDirection {
507 Up,
508 Down,
509 Left,
510 Right,
511}
512
513impl SplitDirection {
514 pub fn all() -> [Self; 4] {
515 [Self::Up, Self::Down, Self::Left, Self::Right]
516 }
517
518 pub fn edge(&self, rect: Bounds<Pixels>) -> Pixels {
519 match self {
520 Self::Up => rect.origin.y,
521 Self::Down => rect.lower_left().y,
522 Self::Left => rect.lower_left().x,
523 Self::Right => rect.lower_right().x,
524 }
525 }
526
527 pub fn along_edge(&self, bounds: Bounds<Pixels>, length: Pixels) -> Bounds<Pixels> {
528 match self {
529 Self::Up => Bounds {
530 origin: bounds.origin,
531 size: size(bounds.size.width, length),
532 },
533 Self::Down => Bounds {
534 origin: point(bounds.lower_left().x, bounds.lower_left().y - length),
535 size: size(bounds.size.width, length),
536 },
537 Self::Left => Bounds {
538 origin: bounds.origin,
539 size: size(length, bounds.size.height),
540 },
541 Self::Right => Bounds {
542 origin: point(bounds.lower_right().x - length, bounds.lower_left().y),
543 size: size(length, bounds.size.height),
544 },
545 }
546 }
547
548 pub fn axis(&self) -> Axis {
549 match self {
550 Self::Up | Self::Down => Axis::Vertical,
551 Self::Left | Self::Right => Axis::Horizontal,
552 }
553 }
554
555 pub fn increasing(&self) -> bool {
556 match self {
557 Self::Left | Self::Up => false,
558 Self::Down | Self::Right => true,
559 }
560 }
561}
562
563mod element {
564
565 use std::{cell::RefCell, iter, rc::Rc, sync::Arc};
566
567 use gpui::{
568 px, relative, Along, AnyElement, Axis, Bounds, CursorStyle, Element, InteractiveBounds,
569 IntoElement, MouseDownEvent, MouseMoveEvent, MouseUpEvent, ParentElement, Pixels, Point,
570 Size, Style, WeakView, WindowContext,
571 };
572 use parking_lot::Mutex;
573 use settings::Settings;
574 use smallvec::SmallVec;
575 use ui::prelude::*;
576 use util::ResultExt;
577
578 use crate::Workspace;
579
580 use crate::WorkspaceSettings;
581
582 use super::{HANDLE_HITBOX_SIZE, HORIZONTAL_MIN_SIZE, VERTICAL_MIN_SIZE};
583
584 const DIVIDER_SIZE: f32 = 1.0;
585
586 pub(super) fn pane_axis(
587 axis: Axis,
588 basis: usize,
589 flexes: Arc<Mutex<Vec<f32>>>,
590 bounding_boxes: Arc<Mutex<Vec<Option<Bounds<Pixels>>>>>,
591 workspace: WeakView<Workspace>,
592 ) -> PaneAxisElement {
593 PaneAxisElement {
594 axis,
595 basis,
596 flexes,
597 bounding_boxes,
598 children: SmallVec::new(),
599 active_pane_ix: None,
600 workspace,
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 workspace: WeakView<Workspace>,
612 }
613
614 impl PaneAxisElement {
615 pub fn with_active_pane(mut self, active_pane_ix: Option<usize>) -> Self {
616 self.active_pane_ix = active_pane_ix;
617 self
618 }
619
620 fn compute_resize(
621 flexes: &Arc<Mutex<Vec<f32>>>,
622 e: &MouseMoveEvent,
623 ix: usize,
624 axis: Axis,
625 child_start: Point<Pixels>,
626 container_size: Size<Pixels>,
627 workspace: WeakView<Workspace>,
628 cx: &mut WindowContext,
629 ) {
630 let min_size = match axis {
631 Axis::Horizontal => px(HORIZONTAL_MIN_SIZE),
632 Axis::Vertical => px(VERTICAL_MIN_SIZE),
633 };
634 let mut flexes = flexes.lock();
635 debug_assert!(flex_values_in_bounds(flexes.as_slice()));
636
637 let size = move |ix, flexes: &[f32]| {
638 container_size.along(axis) * (flexes[ix] / flexes.len() as f32)
639 };
640
641 // Don't allow resizing to less than the minimum size, if elements are already too small
642 if min_size - px(1.) > size(ix, flexes.as_slice()) {
643 return;
644 }
645
646 let mut proposed_current_pixel_change =
647 (e.position - child_start).along(axis) - size(ix, flexes.as_slice());
648
649 let flex_changes = |pixel_dx, target_ix, next: isize, flexes: &[f32]| {
650 let flex_change = pixel_dx / container_size.along(axis);
651 let current_target_flex = flexes[target_ix] + flex_change;
652 let next_target_flex = flexes[(target_ix as isize + next) as usize] - flex_change;
653 (current_target_flex, next_target_flex)
654 };
655
656 let mut successors = iter::from_fn({
657 let forward = proposed_current_pixel_change > px(0.);
658 let mut ix_offset = 0;
659 let len = flexes.len();
660 move || {
661 let result = if forward {
662 (ix + 1 + ix_offset < len).then(|| ix + ix_offset)
663 } else {
664 (ix as isize - ix_offset as isize >= 0).then(|| ix - ix_offset)
665 };
666
667 ix_offset += 1;
668
669 result
670 }
671 });
672
673 while proposed_current_pixel_change.abs() > px(0.) {
674 let Some(current_ix) = successors.next() else {
675 break;
676 };
677
678 let next_target_size = Pixels::max(
679 size(current_ix + 1, flexes.as_slice()) - proposed_current_pixel_change,
680 min_size,
681 );
682
683 let current_target_size = Pixels::max(
684 size(current_ix, flexes.as_slice()) + size(current_ix + 1, flexes.as_slice())
685 - next_target_size,
686 min_size,
687 );
688
689 let current_pixel_change =
690 current_target_size - size(current_ix, flexes.as_slice());
691
692 let (current_target_flex, next_target_flex) =
693 flex_changes(current_pixel_change, current_ix, 1, flexes.as_slice());
694
695 flexes[current_ix] = current_target_flex;
696 flexes[current_ix + 1] = next_target_flex;
697
698 proposed_current_pixel_change -= current_pixel_change;
699 }
700
701 workspace
702 .update(cx, |this, cx| this.schedule_serialize(cx))
703 .log_err();
704 cx.notify();
705 }
706
707 fn push_handle(
708 flexes: Arc<Mutex<Vec<f32>>>,
709 dragged_handle: Rc<RefCell<Option<usize>>>,
710 axis: Axis,
711 ix: usize,
712 pane_bounds: Bounds<Pixels>,
713 axis_bounds: Bounds<Pixels>,
714 workspace: WeakView<Workspace>,
715 cx: &mut WindowContext,
716 ) {
717 let handle_bounds = Bounds {
718 origin: pane_bounds.origin.apply_along(axis, |origin| {
719 origin + pane_bounds.size.along(axis) - px(HANDLE_HITBOX_SIZE / 2.)
720 }),
721 size: pane_bounds
722 .size
723 .apply_along(axis, |_| px(HANDLE_HITBOX_SIZE)),
724 };
725 let divider_bounds = Bounds {
726 origin: pane_bounds
727 .origin
728 .apply_along(axis, |origin| origin + pane_bounds.size.along(axis)),
729 size: pane_bounds.size.apply_along(axis, |_| px(DIVIDER_SIZE)),
730 };
731
732 cx.with_z_index(3, |cx| {
733 let interactive_handle_bounds = InteractiveBounds {
734 bounds: handle_bounds,
735 stacking_order: cx.stacking_order().clone(),
736 };
737 if interactive_handle_bounds.visibly_contains(&cx.mouse_position(), cx) {
738 cx.set_cursor_style(match axis {
739 Axis::Vertical => CursorStyle::ResizeUpDown,
740 Axis::Horizontal => CursorStyle::ResizeLeftRight,
741 })
742 }
743
744 cx.add_opaque_layer(handle_bounds);
745 cx.paint_quad(gpui::fill(divider_bounds, cx.theme().colors().border));
746
747 cx.on_mouse_event({
748 let dragged_handle = dragged_handle.clone();
749 let flexes = flexes.clone();
750 let workspace = workspace.clone();
751 move |e: &MouseDownEvent, phase, cx| {
752 if phase.bubble() && handle_bounds.contains(&e.position) {
753 dragged_handle.replace(Some(ix));
754 if e.click_count >= 2 {
755 let mut borrow = flexes.lock();
756 *borrow = vec![1.; borrow.len()];
757 workspace
758 .update(cx, |this, cx| this.schedule_serialize(cx))
759 .log_err();
760 cx.notify();
761 }
762 }
763 }
764 });
765 cx.on_mouse_event({
766 let workspace = workspace.clone();
767 move |e: &MouseMoveEvent, phase, cx| {
768 let dragged_handle = dragged_handle.borrow();
769
770 if phase.bubble() && *dragged_handle == Some(ix) {
771 Self::compute_resize(
772 &flexes,
773 e,
774 ix,
775 axis,
776 pane_bounds.origin,
777 axis_bounds.size,
778 workspace.clone(),
779 cx,
780 )
781 }
782 }
783 });
784 });
785 }
786 }
787
788 impl IntoElement for PaneAxisElement {
789 type Element = Self;
790
791 fn element_id(&self) -> Option<ui::prelude::ElementId> {
792 Some(self.basis.into())
793 }
794
795 fn into_element(self) -> Self::Element {
796 self
797 }
798 }
799
800 impl Element for PaneAxisElement {
801 type State = Rc<RefCell<Option<usize>>>;
802
803 fn request_layout(
804 &mut self,
805 state: Option<Self::State>,
806 cx: &mut ui::prelude::WindowContext,
807 ) -> (gpui::LayoutId, Self::State) {
808 let mut style = Style::default();
809 style.flex_grow = 1.;
810 style.flex_shrink = 1.;
811 style.flex_basis = relative(0.).into();
812 style.size.width = relative(1.).into();
813 style.size.height = relative(1.).into();
814 let layout_id = cx.request_layout(&style, None);
815 let dragged_pane = state.unwrap_or_else(|| Rc::new(RefCell::new(None)));
816 (layout_id, dragged_pane)
817 }
818
819 fn paint(
820 &mut self,
821 bounds: gpui::Bounds<ui::prelude::Pixels>,
822 state: &mut Self::State,
823 cx: &mut ui::prelude::WindowContext,
824 ) {
825 let flexes = self.flexes.lock().clone();
826 let len = self.children.len();
827 debug_assert!(flexes.len() == len);
828 debug_assert!(flex_values_in_bounds(flexes.as_slice()));
829
830 let magnification_value = WorkspaceSettings::get(None, cx).active_pane_magnification;
831 let active_pane_magnification = if magnification_value == 1. {
832 None
833 } else {
834 Some(magnification_value)
835 };
836
837 let total_flex = if let Some(flex) = active_pane_magnification {
838 self.children.len() as f32 - 1. + flex
839 } else {
840 len as f32
841 };
842
843 let mut origin = bounds.origin;
844 let space_per_flex = bounds.size.along(self.axis) / total_flex;
845
846 let mut bounding_boxes = self.bounding_boxes.lock();
847 bounding_boxes.clear();
848
849 for (ix, child) in self.children.iter_mut().enumerate() {
850 let child_flex = active_pane_magnification
851 .map(|magnification| {
852 if self.active_pane_ix == Some(ix) {
853 magnification
854 } else {
855 1.
856 }
857 })
858 .unwrap_or_else(|| flexes[ix]);
859
860 let child_size = bounds
861 .size
862 .apply_along(self.axis, |_| space_per_flex * child_flex);
863
864 let child_bounds = Bounds {
865 origin,
866 size: child_size,
867 };
868 bounding_boxes.push(Some(child_bounds));
869 cx.with_z_index(0, |cx| {
870 child.draw(origin, child_size.into(), cx);
871 });
872
873 if active_pane_magnification.is_none() {
874 cx.with_z_index(1, |cx| {
875 if ix < len - 1 {
876 Self::push_handle(
877 self.flexes.clone(),
878 state.clone(),
879 self.axis,
880 ix,
881 child_bounds,
882 bounds,
883 self.workspace.clone(),
884 cx,
885 );
886 }
887 });
888 }
889
890 origin = origin.apply_along(self.axis, |val| val + child_size.along(self.axis));
891 }
892
893 cx.with_z_index(1, |cx| {
894 cx.on_mouse_event({
895 let state = state.clone();
896 move |_: &MouseUpEvent, phase, _cx| {
897 if phase.bubble() {
898 state.replace(None);
899 }
900 }
901 });
902 })
903 }
904 }
905
906 impl ParentElement for PaneAxisElement {
907 fn children_mut(&mut self) -> &mut smallvec::SmallVec<[AnyElement; 2]> {
908 &mut self.children
909 }
910 }
911
912 fn flex_values_in_bounds(flexes: &[f32]) -> bool {
913 (flexes.iter().copied().sum::<f32>() - flexes.len() as f32).abs() < 0.001
914 }
915}