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, AnyView, AnyWeakView, Axis, Bounds, IntoElement, Model, MouseButton, Pixels,
7 Point, View, ViewContext,
8};
9use parking_lot::Mutex;
10use project::Project;
11use serde::Deserialize;
12use std::sync::Arc;
13use ui::prelude::*;
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 let mut leader_join_data = None;
187 if let Some(leader) = &leader {
188 let mut leader_color = cx
189 .theme()
190 .players()
191 .color_for_participant(leader.participant_index.0)
192 .cursor;
193 leader_color.fade_out(0.3);
194 leader_border = Some(leader_color);
195
196 leader_status_box = match leader.location {
197 ParticipantLocation::SharedProject {
198 project_id: leader_project_id,
199 } => {
200 if Some(leader_project_id) == project.read(cx).remote_id() {
201 None
202 } else {
203 leader_join_data = Some((leader_project_id, leader.user.id));
204 Some(Label::new(format!(
205 "Follow {} to their active project",
206 leader.user.github_login,
207 )))
208 }
209 }
210 ParticipantLocation::UnsharedProject => Some(Label::new(format!(
211 "{} is viewing an unshared Zed project",
212 leader.user.github_login
213 ))),
214 ParticipantLocation::External => Some(Label::new(format!(
215 "{} is viewing a window outside of Zed",
216 leader.user.github_login
217 ))),
218 };
219 }
220
221 div()
222 .relative()
223 .flex_1()
224 .size_full()
225 .child(AnyView::from(pane.clone()).cached())
226 .when_some(leader_border, |this, color| {
227 this.child(
228 div()
229 .absolute()
230 .size_full()
231 .left_0()
232 .top_0()
233 .border_2()
234 .border_color(color),
235 )
236 })
237 .when_some(leader_status_box, |this, status_box| {
238 this.child(
239 div()
240 .absolute()
241 .w_96()
242 .bottom_3()
243 .right_3()
244 .elevation_2(cx)
245 .p_1()
246 .z_index(1)
247 .child(status_box)
248 .when_some(
249 leader_join_data,
250 |this, (leader_project_id, leader_user_id)| {
251 this.cursor_pointer().on_mouse_down(
252 MouseButton::Left,
253 cx.listener(move |this, _, cx| {
254 crate::join_remote_project(
255 leader_project_id,
256 leader_user_id,
257 this.app_state().clone(),
258 cx,
259 )
260 .detach_and_log_err(cx);
261 }),
262 )
263 },
264 ),
265 )
266 })
267 .into_any()
268 }
269 Member::Axis(axis) => axis
270 .render(
271 project,
272 basis + 1,
273 follower_states,
274 active_call,
275 active_pane,
276 zoomed,
277 app_state,
278 cx,
279 )
280 .into_any(),
281 }
282 }
283
284 fn collect_panes<'a>(&'a self, panes: &mut Vec<&'a View<Pane>>) {
285 match self {
286 Member::Axis(axis) => {
287 for member in &axis.members {
288 member.collect_panes(panes);
289 }
290 }
291 Member::Pane(pane) => panes.push(pane),
292 }
293 }
294}
295
296#[derive(Clone)]
297pub(crate) struct PaneAxis {
298 pub axis: Axis,
299 pub members: Vec<Member>,
300 pub flexes: Arc<Mutex<Vec<f32>>>,
301 pub bounding_boxes: Arc<Mutex<Vec<Option<Bounds<Pixels>>>>>,
302}
303
304impl PaneAxis {
305 pub fn new(axis: Axis, members: Vec<Member>) -> Self {
306 let flexes = Arc::new(Mutex::new(vec![1.; members.len()]));
307 let bounding_boxes = Arc::new(Mutex::new(vec![None; members.len()]));
308 Self {
309 axis,
310 members,
311 flexes,
312 bounding_boxes,
313 }
314 }
315
316 pub fn load(axis: Axis, members: Vec<Member>, flexes: Option<Vec<f32>>) -> Self {
317 let flexes = flexes.unwrap_or_else(|| vec![1.; members.len()]);
318 debug_assert!(members.len() == flexes.len());
319
320 let flexes = Arc::new(Mutex::new(flexes));
321 let bounding_boxes = Arc::new(Mutex::new(vec![None; members.len()]));
322 Self {
323 axis,
324 members,
325 flexes,
326 bounding_boxes,
327 }
328 }
329
330 fn split(
331 &mut self,
332 old_pane: &View<Pane>,
333 new_pane: &View<Pane>,
334 direction: SplitDirection,
335 ) -> Result<()> {
336 for (mut idx, member) in self.members.iter_mut().enumerate() {
337 match member {
338 Member::Axis(axis) => {
339 if axis.split(old_pane, new_pane, direction).is_ok() {
340 return Ok(());
341 }
342 }
343 Member::Pane(pane) => {
344 if pane == old_pane {
345 if direction.axis() == self.axis {
346 if direction.increasing() {
347 idx += 1;
348 }
349
350 self.members.insert(idx, Member::Pane(new_pane.clone()));
351 *self.flexes.lock() = vec![1.; self.members.len()];
352 } else {
353 *member =
354 Member::new_axis(old_pane.clone(), new_pane.clone(), direction);
355 }
356 return Ok(());
357 }
358 }
359 }
360 }
361 Err(anyhow!("Pane not found"))
362 }
363
364 fn remove(&mut self, pane_to_remove: &View<Pane>) -> Result<Option<Member>> {
365 let mut found_pane = false;
366 let mut remove_member = None;
367 for (idx, member) in self.members.iter_mut().enumerate() {
368 match member {
369 Member::Axis(axis) => {
370 if let Ok(last_pane) = axis.remove(pane_to_remove) {
371 if let Some(last_pane) = last_pane {
372 *member = last_pane;
373 }
374 found_pane = true;
375 break;
376 }
377 }
378 Member::Pane(pane) => {
379 if pane == pane_to_remove {
380 found_pane = true;
381 remove_member = Some(idx);
382 break;
383 }
384 }
385 }
386 }
387
388 if found_pane {
389 if let Some(idx) = remove_member {
390 self.members.remove(idx);
391 *self.flexes.lock() = vec![1.; self.members.len()];
392 }
393
394 if self.members.len() == 1 {
395 let result = self.members.pop();
396 *self.flexes.lock() = vec![1.; self.members.len()];
397 Ok(result)
398 } else {
399 Ok(None)
400 }
401 } else {
402 Err(anyhow!("Pane not found"))
403 }
404 }
405
406 fn swap(&mut self, from: &View<Pane>, to: &View<Pane>) {
407 for member in self.members.iter_mut() {
408 match member {
409 Member::Axis(axis) => axis.swap(from, to),
410 Member::Pane(pane) => {
411 if pane == from {
412 *member = Member::Pane(to.clone());
413 } else if pane == to {
414 *member = Member::Pane(from.clone())
415 }
416 }
417 }
418 }
419 }
420
421 fn bounding_box_for_pane(&self, pane: &View<Pane>) -> Option<Bounds<Pixels>> {
422 debug_assert!(self.members.len() == self.bounding_boxes.lock().len());
423
424 for (idx, member) in self.members.iter().enumerate() {
425 match member {
426 Member::Pane(found) => {
427 if pane == found {
428 return self.bounding_boxes.lock()[idx];
429 }
430 }
431 Member::Axis(axis) => {
432 if let Some(rect) = axis.bounding_box_for_pane(pane) {
433 return Some(rect);
434 }
435 }
436 }
437 }
438 None
439 }
440
441 fn pane_at_pixel_position(&self, coordinate: Point<Pixels>) -> Option<&View<Pane>> {
442 debug_assert!(self.members.len() == self.bounding_boxes.lock().len());
443
444 let bounding_boxes = self.bounding_boxes.lock();
445
446 for (idx, member) in self.members.iter().enumerate() {
447 if let Some(coordinates) = bounding_boxes[idx] {
448 if coordinates.contains(&coordinate) {
449 return match member {
450 Member::Pane(found) => Some(found),
451 Member::Axis(axis) => axis.pane_at_pixel_position(coordinate),
452 };
453 }
454 }
455 }
456 None
457 }
458
459 fn render(
460 &self,
461 project: &Model<Project>,
462 basis: usize,
463 follower_states: &HashMap<View<Pane>, FollowerState>,
464 active_call: Option<&Model<ActiveCall>>,
465 active_pane: &View<Pane>,
466 zoomed: Option<&AnyWeakView>,
467 app_state: &Arc<AppState>,
468 cx: &mut ViewContext<Workspace>,
469 ) -> gpui::AnyElement {
470 debug_assert!(self.members.len() == self.flexes.lock().len());
471 let mut active_pane_ix = None;
472
473 pane_axis(
474 self.axis,
475 basis,
476 self.flexes.clone(),
477 self.bounding_boxes.clone(),
478 cx.view().downgrade(),
479 )
480 .children(self.members.iter().enumerate().map(|(ix, member)| {
481 if member.contains(active_pane) {
482 active_pane_ix = Some(ix);
483 }
484 member
485 .render(
486 project,
487 (basis + ix) * 10,
488 follower_states,
489 active_call,
490 active_pane,
491 zoomed,
492 app_state,
493 cx,
494 )
495 .into_any_element()
496 }))
497 .with_active_pane(active_pane_ix)
498 .into_any_element()
499 }
500}
501
502#[derive(Clone, Copy, Debug, Deserialize, PartialEq)]
503pub enum SplitDirection {
504 Up,
505 Down,
506 Left,
507 Right,
508}
509
510impl SplitDirection {
511 pub fn all() -> [Self; 4] {
512 [Self::Up, Self::Down, Self::Left, Self::Right]
513 }
514
515 pub fn edge(&self, rect: Bounds<Pixels>) -> Pixels {
516 match self {
517 Self::Up => rect.origin.y,
518 Self::Down => rect.lower_left().y,
519 Self::Left => rect.lower_left().x,
520 Self::Right => rect.lower_right().x,
521 }
522 }
523
524 pub fn along_edge(&self, bounds: Bounds<Pixels>, length: Pixels) -> Bounds<Pixels> {
525 match self {
526 Self::Up => Bounds {
527 origin: bounds.origin,
528 size: size(bounds.size.width, length),
529 },
530 Self::Down => Bounds {
531 origin: point(bounds.lower_left().x, bounds.lower_left().y - length),
532 size: size(bounds.size.width, length),
533 },
534 Self::Left => Bounds {
535 origin: bounds.origin,
536 size: size(length, bounds.size.height),
537 },
538 Self::Right => Bounds {
539 origin: point(bounds.lower_right().x - length, bounds.lower_left().y),
540 size: size(length, bounds.size.height),
541 },
542 }
543 }
544
545 pub fn axis(&self) -> Axis {
546 match self {
547 Self::Up | Self::Down => Axis::Vertical,
548 Self::Left | Self::Right => Axis::Horizontal,
549 }
550 }
551
552 pub fn increasing(&self) -> bool {
553 match self {
554 Self::Left | Self::Up => false,
555 Self::Down | Self::Right => true,
556 }
557 }
558}
559
560mod element {
561
562 use std::{cell::RefCell, iter, rc::Rc, sync::Arc};
563
564 use gpui::{
565 px, relative, Along, AnyElement, Axis, Bounds, CursorStyle, Element, InteractiveBounds,
566 IntoElement, MouseDownEvent, MouseMoveEvent, MouseUpEvent, ParentElement, Pixels, Point,
567 Size, Style, WeakView, WindowContext,
568 };
569 use parking_lot::Mutex;
570 use settings::Settings;
571 use smallvec::SmallVec;
572 use ui::prelude::*;
573 use util::ResultExt;
574
575 use crate::Workspace;
576
577 use crate::WorkspaceSettings;
578
579 use super::{HANDLE_HITBOX_SIZE, HORIZONTAL_MIN_SIZE, VERTICAL_MIN_SIZE};
580
581 const DIVIDER_SIZE: f32 = 1.0;
582
583 pub(super) fn pane_axis(
584 axis: Axis,
585 basis: usize,
586 flexes: Arc<Mutex<Vec<f32>>>,
587 bounding_boxes: Arc<Mutex<Vec<Option<Bounds<Pixels>>>>>,
588 workspace: WeakView<Workspace>,
589 ) -> PaneAxisElement {
590 PaneAxisElement {
591 axis,
592 basis,
593 flexes,
594 bounding_boxes,
595 children: SmallVec::new(),
596 active_pane_ix: None,
597 workspace,
598 }
599 }
600
601 pub struct PaneAxisElement {
602 axis: Axis,
603 basis: usize,
604 flexes: Arc<Mutex<Vec<f32>>>,
605 bounding_boxes: Arc<Mutex<Vec<Option<Bounds<Pixels>>>>>,
606 children: SmallVec<[AnyElement; 2]>,
607 active_pane_ix: Option<usize>,
608 workspace: WeakView<Workspace>,
609 }
610
611 impl PaneAxisElement {
612 pub fn with_active_pane(mut self, active_pane_ix: Option<usize>) -> Self {
613 self.active_pane_ix = active_pane_ix;
614 self
615 }
616
617 fn compute_resize(
618 flexes: &Arc<Mutex<Vec<f32>>>,
619 e: &MouseMoveEvent,
620 ix: usize,
621 axis: Axis,
622 child_start: Point<Pixels>,
623 container_size: Size<Pixels>,
624 workspace: WeakView<Workspace>,
625 cx: &mut WindowContext,
626 ) {
627 let min_size = match axis {
628 Axis::Horizontal => px(HORIZONTAL_MIN_SIZE),
629 Axis::Vertical => px(VERTICAL_MIN_SIZE),
630 };
631 let mut flexes = flexes.lock();
632 debug_assert!(flex_values_in_bounds(flexes.as_slice()));
633
634 let size = move |ix, flexes: &[f32]| {
635 container_size.along(axis) * (flexes[ix] / flexes.len() as f32)
636 };
637
638 // Don't allow resizing to less than the minimum size, if elements are already too small
639 if min_size - px(1.) > size(ix, flexes.as_slice()) {
640 return;
641 }
642
643 let mut proposed_current_pixel_change =
644 (e.position - child_start).along(axis) - size(ix, flexes.as_slice());
645
646 let flex_changes = |pixel_dx, target_ix, next: isize, flexes: &[f32]| {
647 let flex_change = pixel_dx / container_size.along(axis);
648 let current_target_flex = flexes[target_ix] + flex_change;
649 let next_target_flex = flexes[(target_ix as isize + next) as usize] - flex_change;
650 (current_target_flex, next_target_flex)
651 };
652
653 let mut successors = iter::from_fn({
654 let forward = proposed_current_pixel_change > px(0.);
655 let mut ix_offset = 0;
656 let len = flexes.len();
657 move || {
658 let result = if forward {
659 (ix + 1 + ix_offset < len).then(|| ix + ix_offset)
660 } else {
661 (ix as isize - ix_offset as isize >= 0).then(|| ix - ix_offset)
662 };
663
664 ix_offset += 1;
665
666 result
667 }
668 });
669
670 while proposed_current_pixel_change.abs() > px(0.) {
671 let Some(current_ix) = successors.next() else {
672 break;
673 };
674
675 let next_target_size = Pixels::max(
676 size(current_ix + 1, flexes.as_slice()) - proposed_current_pixel_change,
677 min_size,
678 );
679
680 let current_target_size = Pixels::max(
681 size(current_ix, flexes.as_slice()) + size(current_ix + 1, flexes.as_slice())
682 - next_target_size,
683 min_size,
684 );
685
686 let current_pixel_change =
687 current_target_size - size(current_ix, flexes.as_slice());
688
689 let (current_target_flex, next_target_flex) =
690 flex_changes(current_pixel_change, current_ix, 1, flexes.as_slice());
691
692 flexes[current_ix] = current_target_flex;
693 flexes[current_ix + 1] = next_target_flex;
694
695 proposed_current_pixel_change -= current_pixel_change;
696 }
697
698 workspace
699 .update(cx, |this, cx| this.schedule_serialize(cx))
700 .log_err();
701 cx.refresh();
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 workspace: WeakView<Workspace>,
712 cx: &mut WindowContext,
713 ) {
714 let handle_bounds = Bounds {
715 origin: pane_bounds.origin.apply_along(axis, |origin| {
716 origin + pane_bounds.size.along(axis) - px(HANDLE_HITBOX_SIZE / 2.)
717 }),
718 size: pane_bounds
719 .size
720 .apply_along(axis, |_| px(HANDLE_HITBOX_SIZE)),
721 };
722 let divider_bounds = Bounds {
723 origin: pane_bounds
724 .origin
725 .apply_along(axis, |origin| origin + pane_bounds.size.along(axis)),
726 size: pane_bounds.size.apply_along(axis, |_| px(DIVIDER_SIZE)),
727 };
728
729 cx.with_z_index(3, |cx| {
730 let interactive_handle_bounds = InteractiveBounds {
731 bounds: handle_bounds,
732 stacking_order: cx.stacking_order().clone(),
733 };
734 if interactive_handle_bounds.visibly_contains(&cx.mouse_position(), cx) {
735 cx.set_cursor_style(match axis {
736 Axis::Vertical => CursorStyle::ResizeUpDown,
737 Axis::Horizontal => CursorStyle::ResizeLeftRight,
738 })
739 }
740
741 cx.add_opaque_layer(handle_bounds);
742 cx.paint_quad(gpui::fill(divider_bounds, cx.theme().colors().border));
743
744 cx.on_mouse_event({
745 let dragged_handle = dragged_handle.clone();
746 let flexes = flexes.clone();
747 let workspace = workspace.clone();
748 move |e: &MouseDownEvent, phase, cx| {
749 if phase.bubble() && handle_bounds.contains(&e.position) {
750 dragged_handle.replace(Some(ix));
751 if e.click_count >= 2 {
752 let mut borrow = flexes.lock();
753 *borrow = vec![1.; borrow.len()];
754 workspace
755 .update(cx, |this, cx| this.schedule_serialize(cx))
756 .log_err();
757 cx.refresh();
758 }
759 }
760 }
761 });
762 cx.on_mouse_event({
763 let workspace = workspace.clone();
764 move |e: &MouseMoveEvent, phase, cx| {
765 let dragged_handle = dragged_handle.borrow();
766
767 if phase.bubble() && *dragged_handle == Some(ix) {
768 Self::compute_resize(
769 &flexes,
770 e,
771 ix,
772 axis,
773 pane_bounds.origin,
774 axis_bounds.size,
775 workspace.clone(),
776 cx,
777 )
778 }
779 }
780 });
781 });
782 }
783 }
784
785 impl IntoElement for PaneAxisElement {
786 type Element = Self;
787
788 fn element_id(&self) -> Option<ui::prelude::ElementId> {
789 Some(self.basis.into())
790 }
791
792 fn into_element(self) -> Self::Element {
793 self
794 }
795 }
796
797 impl Element for PaneAxisElement {
798 type State = Rc<RefCell<Option<usize>>>;
799
800 fn request_layout(
801 &mut self,
802 state: Option<Self::State>,
803 cx: &mut ui::prelude::WindowContext,
804 ) -> (gpui::LayoutId, Self::State) {
805 let mut style = Style::default();
806 style.flex_grow = 1.;
807 style.flex_shrink = 1.;
808 style.flex_basis = relative(0.).into();
809 style.size.width = relative(1.).into();
810 style.size.height = relative(1.).into();
811 let layout_id = cx.request_layout(&style, None);
812 let dragged_pane = state.unwrap_or_else(|| Rc::new(RefCell::new(None)));
813 (layout_id, dragged_pane)
814 }
815
816 fn paint(
817 &mut self,
818 bounds: gpui::Bounds<ui::prelude::Pixels>,
819 state: &mut Self::State,
820 cx: &mut ui::prelude::WindowContext,
821 ) {
822 let flexes = self.flexes.lock().clone();
823 let len = self.children.len();
824 debug_assert!(flexes.len() == len);
825 debug_assert!(flex_values_in_bounds(flexes.as_slice()));
826
827 let magnification_value = WorkspaceSettings::get(None, cx).active_pane_magnification;
828 let active_pane_magnification = if magnification_value == 1. {
829 None
830 } else {
831 Some(magnification_value)
832 };
833
834 let total_flex = if let Some(flex) = active_pane_magnification {
835 self.children.len() as f32 - 1. + flex
836 } else {
837 len as f32
838 };
839
840 let mut origin = bounds.origin;
841 let space_per_flex = bounds.size.along(self.axis) / total_flex;
842
843 let mut bounding_boxes = self.bounding_boxes.lock();
844 bounding_boxes.clear();
845
846 for (ix, child) in self.children.iter_mut().enumerate() {
847 let child_flex = active_pane_magnification
848 .map(|magnification| {
849 if self.active_pane_ix == Some(ix) {
850 magnification
851 } else {
852 1.
853 }
854 })
855 .unwrap_or_else(|| flexes[ix]);
856
857 let child_size = bounds
858 .size
859 .apply_along(self.axis, |_| space_per_flex * child_flex);
860
861 let child_bounds = Bounds {
862 origin,
863 size: child_size,
864 };
865 bounding_boxes.push(Some(child_bounds));
866 cx.with_z_index(0, |cx| {
867 child.draw(origin, child_size.into(), cx);
868 });
869
870 if active_pane_magnification.is_none() {
871 cx.with_z_index(1, |cx| {
872 if ix < len - 1 {
873 Self::push_handle(
874 self.flexes.clone(),
875 state.clone(),
876 self.axis,
877 ix,
878 child_bounds,
879 bounds,
880 self.workspace.clone(),
881 cx,
882 );
883 }
884 });
885 }
886
887 origin = origin.apply_along(self.axis, |val| val + child_size.along(self.axis));
888 }
889
890 cx.with_z_index(1, |cx| {
891 cx.on_mouse_event({
892 let state = state.clone();
893 move |_: &MouseUpEvent, phase, _cx| {
894 if phase.bubble() {
895 state.replace(None);
896 }
897 }
898 });
899 })
900 }
901 }
902
903 impl ParentElement for PaneAxisElement {
904 fn children_mut(&mut self) -> &mut smallvec::SmallVec<[AnyElement; 2]> {
905 &mut self.children
906 }
907 }
908
909 fn flex_values_in_bounds(flexes: &[f32]) -> bool {
910 (flexes.iter().copied().sum::<f32>() - flexes.len() as f32).abs() < 0.001
911 }
912}