cranpose_app_shell/
surface.rs

1//! Root surfaces: what the shell keeps per window.
2//!
3//! The composition is one tree. Each window the app shows is a root in that
4//! tree: the composition root for the primary window, a node carrying
5//! `Modifier::window_root` for every other. A [`RootSurface`] is the shell's
6//! bookkeeping for one such root: the renderer that draws it, the viewport it
7//! draws into, the pointer that hovers it, the gesture it tracks, the
8//! snapshots a test or a platform reads for it, and the dirt that says whether
9//! it owes the display a frame. A [`SurfaceMut`] borrows one surface together
10//! with the app, which is how a platform delivers a window's events and reads
11//! a window's frame.
12
13use std::{cell::RefCell, fmt::Debug, rc::Rc};
14
15use cranpose_core::{NodeId, collections::map::HashSet};
16use cranpose_foundation::{PointerButtons, PointerSource, RotaryScrollEvent};
17use cranpose_render_common::Renderer;
18use cranpose_ui::{
19    LayoutTree, PlatformTextInputHandler, SemanticsTree, pointer_icon_session::PointerIconState,
20};
21use cranpose_ui_graphics::{Point, PointerIcon, Size};
22use web_time::Instant;
23
24use crate::{
25    AppShell, DevOverlayControl, FramePacingMode, FrameRatePreference, FrameSchedule,
26    FrameScheduler, FrameUpdateResult, PlatformFrameDriver, ShellApp,
27    hit_path_tracker::{HitPathTracker, PointerId},
28};
29
30/// Names a root surface of the app: the primary window, or a window root
31/// declared with [`Modifier::window_root`](cranpose_ui::Modifier::window_root)
32/// by the id given there.
33#[derive(Clone, Copy, Debug, PartialEq, Eq, Hash)]
34pub enum RootId {
35    /// The composition root, drawn in the app's first window.
36    Primary,
37    /// The node carrying `Modifier::window_root` with this id.
38    Window(u64),
39}
40
41/// The shell's bookkeeping for one root.
42///
43/// The primary surface draws the composition root. A window surface draws the
44/// window root node registered under its id, and draws nothing while that
45/// node is not in the tree. Everything here is what an OS owns per window:
46/// the framebuffer, the viewport, the pointer, the cursor image, the soft
47/// keyboard, the frame the window is asked for.
48pub struct RootSurface<R: Renderer> {
49    pub(crate) id: RootId,
50    pub(crate) root: Option<NodeId>,
51    pub(crate) renderer: R,
52    pub(crate) cursor: (f32, f32),
53    pub(crate) viewport: (f32, f32),
54    pub(crate) buffer_size: (u32, u32),
55    pub(crate) layout_tree: Option<LayoutTree>,
56    pub(crate) semantics_tree: Option<SemanticsTree>,
57    /// A layout pass ran since `semantics_tree` was brought up to date, so
58    /// its bounds may be out of date though no node marked its semantics.
59    semantics_moved: bool,
60    pub(crate) modal_focus: Vec<(NodeId, Option<NodeId>)>,
61    pub(crate) frame_rate_preference: FrameRatePreference,
62    pub(crate) scene_dirty: bool,
63    pub(crate) scoped_layout_scene_nodes: Vec<NodeId>,
64    pub(crate) retained_visual_nodes: HashSet<NodeId>,
65    pub(crate) is_dirty: bool,
66    pub(crate) buttons_pressed: PointerButtons,
67    pub(crate) pointer_source: PointerSource,
68    pub(crate) hit_path_tracker: HitPathTracker,
69    pub(crate) hovered_nodes: Vec<NodeId>,
70    pub(crate) on_rotary_scroll: Option<Rc<dyn Fn(RotaryScrollEvent) -> bool>>,
71    pub(crate) dev_overlay_controls: Vec<DevOverlayControl>,
72    pub(crate) inspector: crate::inspector::DeveloperInspector,
73    pub(crate) dev_overlay_text: String,
74    pub(crate) dev_overlay_last_refresh: Option<Instant>,
75    pub(crate) dev_overlay_viewport: Option<Size>,
76    pub(crate) frame_scheduler: FrameScheduler,
77    pub(crate) pointer_icon: PointerIconState,
78    pub(crate) last_update: FrameUpdateResult,
79    pub(crate) frame_owed: bool,
80    pub(crate) screen_origin: Option<Point>,
81}
82
83impl<R: Renderer> RootSurface<R> {
84    pub(crate) fn new(
85        id: RootId,
86        renderer: R,
87        buffer_size: (u32, u32),
88        viewport: (f32, f32),
89    ) -> Self {
90        Self {
91            id,
92            root: None,
93            renderer,
94            cursor: (0.0, 0.0),
95            viewport,
96            buffer_size,
97            layout_tree: None,
98            semantics_tree: None,
99            semantics_moved: false,
100            modal_focus: Vec::new(),
101            frame_rate_preference: FrameRatePreference::default(),
102            scene_dirty: true,
103            scoped_layout_scene_nodes: Vec::new(),
104            retained_visual_nodes: HashSet::default(),
105            is_dirty: true,
106            buttons_pressed: PointerButtons::NONE,
107            pointer_source: PointerSource::Unknown,
108            hit_path_tracker: HitPathTracker::new(),
109            hovered_nodes: Vec::new(),
110            on_rotary_scroll: None,
111            dev_overlay_controls: Vec::new(),
112            inspector: crate::inspector::DeveloperInspector::default(),
113            dev_overlay_text: String::new(),
114            dev_overlay_last_refresh: None,
115            dev_overlay_viewport: None,
116            frame_scheduler: FrameScheduler::default(),
117            pointer_icon: PointerIconState::new(),
118            last_update: FrameUpdateResult::default(),
119            frame_owed: false,
120            screen_origin: None,
121        }
122    }
123
124    pub(crate) fn root_node(&self, app: &ShellApp) -> Option<NodeId> {
125        match self.id {
126            RootId::Primary => app.composition.root(),
127            RootId::Window(_) => self.root,
128        }
129    }
130
131    pub(crate) fn owns_nodes_under(&self, window_root: Option<NodeId>) -> bool {
132        match self.id {
133            RootId::Primary => window_root.is_none(),
134            RootId::Window(_) => self.root.is_some() && self.root == window_root,
135        }
136    }
137
138    pub(crate) fn viewport_size(&self) -> Size {
139        Size {
140            width: self.viewport.0,
141            height: self.viewport.1,
142        }
143    }
144
145    pub(crate) fn screen_point_inside(&self, screen: Point) -> Option<Point> {
146        let origin = self.screen_origin?;
147        let local = Point {
148            x: screen.x - origin.x,
149            y: screen.y - origin.y,
150        };
151        (local.x >= 0.0
152            && local.y >= 0.0
153            && local.x <= self.viewport.0
154            && local.y <= self.viewport.1)
155            .then_some(local)
156    }
157
158    pub(crate) fn set_root(&mut self, root: Option<NodeId>) {
159        if self.root == root {
160            return;
161        }
162        self.root = root;
163        self.forget_snapshots();
164        self.scoped_layout_scene_nodes.clear();
165        self.retained_visual_nodes.clear();
166        self.hit_path_tracker.clear();
167        self.hovered_nodes.clear();
168        self.buttons_pressed = PointerButtons::NONE;
169        self.scene_dirty = true;
170        self.is_dirty = true;
171    }
172
173    /// Drops the layout snapshot and marks the semantics tree for an update,
174    /// which keeps what did not change.
175    pub(crate) fn forget_snapshots(&mut self) {
176        self.layout_tree = None;
177        self.semantics_moved = true;
178    }
179
180    pub(crate) fn has_active_pointer_gesture(&self) -> bool {
181        self.buttons_pressed != PointerButtons::NONE
182            && self.hit_path_tracker.has_path(PointerId::PRIMARY)
183    }
184
185    pub(crate) fn renderer_warmup_due(&self, app: &ShellApp) -> bool {
186        self.renderer.needs_frame_warmup() && !app.runtime.runtime_handle().has_frame_callbacks()
187    }
188
189    pub(crate) fn needs_redraw_in_context(&self, app: &ShellApp) -> bool {
190        app.has_stale_work_in_context()
191            || self.is_dirty
192            || self.scene_dirty
193            || self.renderer_warmup_due(app)
194    }
195
196    pub(crate) fn compute_frame_schedule(
197        &self,
198        app: &ShellApp,
199        surfaces_dirty: bool,
200    ) -> FrameSchedule {
201        let app_context = Rc::clone(&app.app_context);
202        let (needs_update, needs_frame) = app_context.enter(|| {
203            let needs_frame = self.is_dirty
204                || self.scene_dirty
205                || app.wants_frame_in_context()
206                || self.has_active_pointer_gesture()
207                || self.renderer_warmup_due(app);
208            (app.needs_ui_update_in_context(surfaces_dirty), needs_frame)
209        });
210        FrameSchedule {
211            needs_update,
212            needs_frame,
213            next_deadline: app.next_event_time(),
214        }
215    }
216
217    pub(crate) fn invalidate_dev_overlay_text(&mut self) {
218        self.dev_overlay_text.clear();
219        self.dev_overlay_last_refresh = None;
220        self.dev_overlay_viewport = None;
221    }
222
223    pub(crate) fn dev_overlay_control_center(&self, mode: FramePacingMode) -> Option<(f32, f32)> {
224        self.dev_overlay_controls
225            .iter()
226            .find(|control| control.mode == mode)
227            .map(|control| {
228                (
229                    control.bounds.x + control.bounds.width * 0.5,
230                    control.bounds.y + control.bounds.height * 0.5,
231                )
232            })
233    }
234
235    pub(crate) fn layout_tree_in_context(&mut self, app: &mut ShellApp) -> Option<&LayoutTree> {
236        if self.layout_tree.is_none() {
237            let root = self.root_node(app)?;
238            let mut applier = app.composition.applier_mut();
239            match cranpose_ui::build_layout_tree_from_applier(&mut applier, root) {
240                Ok(layout_tree) => {
241                    self.layout_tree = layout_tree;
242                }
243                Err(err) => {
244                    log::debug!("failed to build layout snapshot: {err}");
245                    return None;
246                }
247            }
248        }
249        self.layout_tree.as_ref()
250    }
251
252    /// The node an open modal takes this surface over with, the root its
253    /// semantics tree would have, found without building the tree.
254    pub(crate) fn top_modal(&self, app: &mut ShellApp) -> Option<NodeId> {
255        let root = self.root_node(app)?;
256        let mut applier = app.composition.applier_mut();
257        cranpose_ui::top_modal_from_applier(&mut applier, root).unwrap_or_else(|err| {
258            log::debug!("failed to find the top modal under root #{root}: {err}");
259            None
260        })
261    }
262
263    pub(crate) fn semantics_tree_in_context(
264        &mut self,
265        app: &mut ShellApp,
266    ) -> Option<&SemanticsTree> {
267        if !app.semantics_enabled && !self.inspector.state.open {
268            return None;
269        }
270        self.semantics_tree_for_input(app)
271    }
272
273    pub(crate) fn semantics_tree_for_input(
274        &mut self,
275        app: &mut ShellApp,
276    ) -> Option<&SemanticsTree> {
277        let root = self.root_node(app)?;
278        let semantics_dirty = {
279            let mut applier = app.composition.applier_mut();
280            cranpose_ui::tree_needs_semantics(&mut *applier, root).unwrap_or_else(|err| {
281                log::debug!("failed to check semantics dirty status for root #{root}: {err}");
282                true
283            })
284        };
285        if self.semantics_tree.is_none() || self.semantics_moved || semantics_dirty {
286            let mut applier = app.composition.applier_mut();
287            match cranpose_ui::update_semantics_tree_from_applier(
288                &mut applier,
289                root,
290                &mut self.semantics_tree,
291            ) {
292                Ok(()) => {
293                    self.semantics_moved = false;
294                    app.semantics_snapshot_revision =
295                        app.semantics_snapshot_revision.wrapping_add(1);
296                }
297                Err(err) => {
298                    log::debug!("failed to build semantics snapshot: {err}");
299                    return None;
300                }
301            }
302        }
303        self.semantics_tree.as_ref()
304    }
305}
306
307#[derive(Default)]
308pub(crate) struct TextInputRoutes {
309    active: Option<RootId>,
310    shown: Option<RootId>,
311    handlers: Vec<(RootId, Rc<dyn PlatformTextInputHandler>)>,
312}
313
314impl TextInputRoutes {
315    pub(crate) fn active(&self) -> RootId {
316        self.active.unwrap_or(RootId::Primary)
317    }
318
319    pub(crate) fn set_active(&mut self, root: RootId) {
320        self.active = Some(root);
321    }
322
323    pub(crate) fn set_handler(&mut self, root: RootId, handler: Rc<dyn PlatformTextInputHandler>) {
324        self.remove(root);
325        self.handlers.push((root, handler));
326    }
327
328    pub(crate) fn remove(&mut self, root: RootId) {
329        self.handlers.retain(|(id, _)| *id != root);
330        if self.shown == Some(root) {
331            self.shown = None;
332        }
333    }
334
335    fn handler(&self, root: RootId) -> Option<Rc<dyn PlatformTextInputHandler>> {
336        self.handlers
337            .iter()
338            .find(|(id, _)| *id == root)
339            .map(|(_, handler)| Rc::clone(handler))
340    }
341
342    fn take_show_target(&mut self) -> Option<Rc<dyn PlatformTextInputHandler>> {
343        let active = self.active();
344        let handler = self.handler(active);
345        if handler.is_some() {
346            self.shown = Some(active);
347        }
348        handler
349    }
350
351    fn take_hide_target(&mut self) -> Option<Rc<dyn PlatformTextInputHandler>> {
352        let target = self.shown.take().unwrap_or_else(|| self.active());
353        self.handler(target)
354    }
355}
356
357pub(crate) struct TextInputRouter {
358    pub(crate) routes: Rc<RefCell<TextInputRoutes>>,
359}
360
361impl PlatformTextInputHandler for TextInputRouter {
362    fn show_keyboard(&self) {
363        let handler = self.routes.borrow_mut().take_show_target();
364        if let Some(handler) = handler {
365            handler.show_keyboard();
366        }
367    }
368
369    fn hide_keyboard(&self) {
370        let handler = self.routes.borrow_mut().take_hide_target();
371        if let Some(handler) = handler {
372            handler.hide_keyboard();
373        }
374    }
375}
376
377pub(crate) fn partition_nodes_by_surface<R: Renderer>(
378    app: &mut ShellApp,
379    surfaces: &[RootSurface<R>],
380    nodes: Vec<NodeId>,
381) -> Vec<Vec<NodeId>> {
382    let mut buckets: Vec<Vec<NodeId>> = surfaces.iter().map(|_| Vec::new()).collect();
383    let Some(primary_root) = app.composition.root() else {
384        return buckets;
385    };
386    let mut applier = app.composition.applier_mut();
387    let attached: Vec<NodeId> = applier
388        .scene_nodes_attached_to(nodes, primary_root)
389        .into_iter()
390        .flatten()
391        .collect();
392    let owners = cranpose_ui::nearest_window_roots(&mut applier, &attached);
393    for (node, owner) in attached.into_iter().zip(owners) {
394        if let Some(index) = surfaces
395            .iter()
396            .position(|surface| surface.owns_nodes_under(owner))
397        {
398            buckets[index].push(node);
399        }
400    }
401    buckets
402}
403
404/// One surface borrowed together with its shell: the handle a platform
405/// delivers a window's events through and reads a window's frame from.
406///
407/// [`AppShell::surface`] hands one out per root. Every method of [`AppShell`]
408/// that names no root acts on the primary surface through the same code, so
409/// a single-window platform never sees this type.
410pub struct SurfaceMut<'a, R: Renderer> {
411    pub(crate) shell: &'a mut AppShell<R>,
412    pub(crate) index: usize,
413}
414
415impl<'a, R> SurfaceMut<'a, R>
416where
417    R: Renderer,
418    R::Error: Debug,
419{
420    pub(crate) fn new(shell: &'a mut AppShell<R>, index: usize) -> Self {
421        Self { shell, index }
422    }
423
424    /// The whole app, for what a window's event needs beyond its surface:
425    /// the clipboard, the dev options, a debug report.
426    pub fn shell(&mut self) -> &mut AppShell<R> {
427        self.shell
428    }
429
430    pub(crate) fn shell_app(&mut self) -> &mut ShellApp {
431        &mut self.shell.app
432    }
433
434    pub(crate) fn shell_app_ref(&self) -> &ShellApp {
435        &self.shell.app
436    }
437
438    pub(crate) fn surface(&self) -> &RootSurface<R> {
439        &self.shell.surfaces[self.index]
440    }
441
442    pub(crate) fn surface_mut(&mut self) -> &mut RootSurface<R> {
443        &mut self.shell.surfaces[self.index]
444    }
445
446    pub(crate) fn parts(&mut self) -> (&mut ShellApp, &mut RootSurface<R>) {
447        let shell = &mut *self.shell;
448        (&mut shell.app, &mut shell.surfaces[self.index])
449    }
450
451    /// Which root this surface draws.
452    pub fn id(&self) -> RootId {
453        self.surface().id
454    }
455
456    /// The node this surface draws from, when it has one.
457    pub fn root(&self) -> Option<NodeId> {
458        let surface = self.surface();
459        surface.root_node(self.shell_app_ref())
460    }
461
462    /// The renderer that draws this surface.
463    pub fn renderer(&mut self) -> &mut R {
464        &mut self.surface_mut().renderer
465    }
466
467    /// The scene this surface last built.
468    pub fn scene(&self) -> &R::Scene {
469        self.surface().renderer.scene()
470    }
471
472    /// Sets the logical size this surface lays out and draws into.
473    ///
474    /// The primary surface's viewport is the composition root's constraints.
475    /// A window surface's viewport is what its renderer draws into; the
476    /// window root lays out to the size its descriptor reports, which the
477    /// platform keeps equal to this. The next update lays out and renders;
478    /// [`AppShell::set_viewport`] additionally runs that frame at once.
479    pub fn set_viewport(&mut self, width: f32, height: f32) {
480        self.surface_mut().viewport = (width, height);
481        match self.id() {
482            RootId::Primary => self.shell_app().request_forced_layout_pass(),
483            RootId::Window(_) => {
484                if let Some(root) = self.root() {
485                    let app_context = Rc::clone(&self.shell_app_ref().app_context);
486                    app_context.enter(|| cranpose_ui::schedule_measure_repass(root));
487                }
488                self.shell_app().request_layout_pass();
489            }
490        }
491        self.surface_mut().scene_dirty = true;
492        self.mark_dirty();
493    }
494
495    /// Tells the shell where the window drawing this surface sits on the
496    /// screen, in logical pixels, so pointer events can carry a
497    /// [`screen_position`](cranpose_foundation::PointerEvent::screen_position).
498    /// A platform sets it when the window moves and before it delivers a
499    /// pointer sample; `None` says the platform does not know.
500    pub fn set_screen_origin(&mut self, origin: Option<Point>) {
501        self.surface_mut().screen_origin = origin;
502    }
503
504    /// Where the window drawing this surface sits on the screen, as the
505    /// platform last said.
506    pub fn screen_origin(&self) -> Option<Point> {
507        self.surface().screen_origin
508    }
509
510    /// The logical size this surface draws into.
511    pub fn viewport_size(&self) -> (f32, f32) {
512        self.surface().viewport
513    }
514
515    /// Sets the physical size of this surface's framebuffer.
516    pub fn set_buffer_size(&mut self, width: u32, height: u32) {
517        self.surface_mut().buffer_size = (width, height);
518    }
519
520    /// The physical size of this surface's framebuffer.
521    pub fn buffer_size(&self) -> (u32, u32) {
522        self.surface().buffer_size
523    }
524
525    /// Marks this surface as needing a redraw.
526    pub fn mark_dirty(&mut self) {
527        self.surface_mut().is_dirty = true;
528    }
529
530    /// Whether this surface owes the display a frame: stale pixels, or a
531    /// renderer that has not warmed its swapchain yet. See
532    /// [`AppShell::needs_redraw`].
533    pub fn needs_redraw(&self) -> bool {
534        let app_context = Rc::clone(&self.shell_app_ref().app_context);
535        app_context.enter(|| self.surface().needs_redraw_in_context(self.shell_app_ref()))
536    }
537
538    /// Whether a primary-button gesture that started on this surface is
539    /// still in progress.
540    pub fn has_active_pointer_gesture(&self) -> bool {
541        self.surface().has_active_pointer_gesture()
542    }
543
544    /// What the update and frame produced for this surface the last time
545    /// the app updated.
546    pub fn last_update_result(&self) -> FrameUpdateResult {
547        self.surface().last_update
548    }
549
550    /// Whether an update since the platform last presented this surface
551    /// changed its pixels. An update runs for the whole app, so the update a
552    /// platform ran for one window may have drawn another; this is how the
553    /// other window learns it has a frame to show.
554    pub fn frame_owed(&self) -> bool {
555        self.surface().frame_owed
556    }
557
558    /// [`Self::frame_owed`], cleared: the platform is about to present.
559    pub fn take_frame_owed(&mut self) -> bool {
560        std::mem::take(&mut self.surface_mut().frame_owed)
561    }
562
563    fn compute_frame_schedule(&self) -> FrameSchedule {
564        self.surface()
565            .compute_frame_schedule(self.shell_app_ref(), self.shell.any_surface_dirty())
566    }
567
568    /// The frame this surface asks its platform for, recorded for
569    /// [`Self::frame_scheduler_snapshot`].
570    pub fn frame_schedule(&self) -> FrameSchedule {
571        let schedule = self.compute_frame_schedule();
572        self.surface().frame_scheduler.record(schedule);
573        schedule
574    }
575
576    /// Computes this surface's frame schedule and applies it to `driver`.
577    pub fn schedule_platform_frame<D>(&self, driver: &D) -> FrameSchedule
578    where
579        D: PlatformFrameDriver + ?Sized,
580    {
581        let schedule = self.compute_frame_schedule();
582        self.surface().frame_scheduler.schedule(schedule, driver);
583        schedule
584    }
585
586    /// The schedule this surface last recorded.
587    pub fn frame_scheduler_snapshot(&self) -> FrameSchedule {
588        self.surface().frame_scheduler.snapshot()
589    }
590
591    /// Sets how the platform should vote the display's frame rate for the
592    /// window showing this surface. See [`AppShell::set_frame_rate_preference`].
593    pub fn set_frame_rate_preference(&mut self, preference: FrameRatePreference) {
594        self.surface_mut().frame_rate_preference = preference;
595    }
596
597    /// This surface's display frame-rate preference.
598    pub fn frame_rate_preference(&self) -> FrameRatePreference {
599        self.surface().frame_rate_preference
600    }
601
602    /// Where this surface's dev overlay draws the control for `mode`, in
603    /// logical pixels. See [`AppShell::dev_overlay_control_center`].
604    pub fn dev_overlay_control_center(&self, mode: FramePacingMode) -> Option<(f32, f32)> {
605        self.surface().dev_overlay_control_center(mode)
606    }
607
608    pub(crate) fn dev_overlay_press(&mut self, x: f32, y: f32) -> bool {
609        if !self.shell_app_ref().dev_options.frame_pacing_controls {
610            return false;
611        }
612        let Some(mode) = self
613            .surface()
614            .dev_overlay_controls
615            .iter()
616            .find(|control| control.bounds.contains(x, y))
617            .map(|control| control.mode)
618        else {
619            return false;
620        };
621        self.shell().set_frame_pacing_mode(mode);
622        true
623    }
624
625    /// Runs `block` with this surface's layout snapshot, built on demand.
626    pub fn with_layout_tree<T>(&mut self, block: impl FnOnce(Option<&LayoutTree>) -> T) -> T {
627        let (app, surface) = self.parts();
628        let app_context = Rc::clone(&app.app_context);
629        app_context.enter(|| block(surface.layout_tree_in_context(app)))
630    }
631
632    /// Runs `block` with this surface's semantics snapshot, built on demand;
633    /// `None` while semantics are disabled.
634    pub fn with_semantics_tree<T>(&mut self, block: impl FnOnce(Option<&SemanticsTree>) -> T) -> T {
635        let (app, surface) = self.parts();
636        let app_context = Rc::clone(&app.app_context);
637        app_context.enter(|| block(surface.semantics_tree_in_context(app)))
638    }
639
640    /// The pointer icon the platform has not applied to this surface's
641    /// window yet. See [`AppShell::take_pointer_icon_change`].
642    pub fn take_pointer_icon_change(&self) -> Option<PointerIcon> {
643        self.surface().pointer_icon.take_change()
644    }
645
646    /// Offers this surface's pointer icon to the platform again. See
647    /// [`AppShell::refresh_pointer_icon`].
648    pub fn refresh_pointer_icon(&self) {
649        self.surface().pointer_icon.refresh();
650    }
651
652    /// Installs the platform text input for the window showing this
653    /// surface. Keyboard requests reach the handler of the surface the
654    /// platform last called active, and a hide reaches the handler that
655    /// showed. See [`AppShell::set_platform_text_input`].
656    pub fn set_platform_text_input(&mut self, handler: Rc<dyn PlatformTextInputHandler>) {
657        let id = self.id();
658        let app = self.shell_app();
659        app.text_input_routes.borrow_mut().set_handler(id, handler);
660        app.install_text_input_router();
661    }
662
663    /// Makes this the surface the platform considers focused: the one the
664    /// soft keyboard belongs to. Pointer presses do this on their own.
665    pub fn activate(&mut self) {
666        let id = self.id();
667        self.shell_app()
668            .text_input_routes
669            .borrow_mut()
670            .set_active(id);
671    }
672}
cranpose_app_shell/surface.rs

cranpose_app_shell/
surface.rs
