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

cranpose_app_shell/
surface.rs
