Flutter Windows Embedder
flutter_windows_view.cc
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1 // Copyright 2013 The Flutter Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4 
6 
7 #include <chrono>
8 
9 #include "flutter/common/constants.h"
10 #include "flutter/fml/platform/win/wstring_conversion.h"
14 #include "flutter/third_party/accessibility/ax/platform/ax_platform_node_win.h"
15 
16 namespace flutter {
17 
18 namespace {
19 // The maximum duration to block the platform thread for while waiting
20 // for a window resize operation to complete.
21 constexpr std::chrono::milliseconds kWindowResizeTimeout{100};
22 
23 /// Returns true if the surface will be updated as part of the resize process.
24 ///
25 /// This is called on window resize to determine if the platform thread needs
26 /// to be blocked until the frame with the right size has been rendered. It
27 /// should be kept in-sync with how the engine deals with a new surface request
28 /// as seen in `CreateOrUpdateSurface` in `GPUSurfaceGL`.
29 bool SurfaceWillUpdate(size_t cur_width,
30  size_t cur_height,
31  size_t target_width,
32  size_t target_height) {
33  // TODO (https://github.com/flutter/flutter/issues/65061) : Avoid special
34  // handling for zero dimensions.
35  bool non_zero_target_dims = target_height > 0 && target_width > 0;
36  bool not_same_size =
37  (cur_height != target_height) || (cur_width != target_width);
38  return non_zero_target_dims && not_same_size;
39 }
40 
41 /// Update the surface's swap interval to block until the v-blank iff
42 /// the system compositor is disabled.
43 void UpdateVsync(const FlutterWindowsEngine& engine, bool needs_vsync) {
44  AngleSurfaceManager* surface_manager = engine.surface_manager();
45  if (!surface_manager) {
46  return;
47  }
48 
49  // Updating the vsync makes the EGL context and render surface current.
50  // If the engine is running, the render surface should only be made current on
51  // the raster thread. If the engine is initializing, the raster thread doesn't
52  // exist yet and the render surface can be made current on the platform
53  // thread.
54  if (engine.running()) {
55  engine.PostRasterThreadTask([surface_manager, needs_vsync]() {
56  surface_manager->SetVSyncEnabled(needs_vsync);
57  });
58  } else {
59  surface_manager->SetVSyncEnabled(needs_vsync);
60 
61  // Release the EGL context so that the raster thread can use it.
62  if (!surface_manager->ClearCurrent()) {
63  FML_LOG(ERROR)
64  << "Unable to clear current surface after updating the swap interval";
65  return;
66  }
67  }
68 }
69 
70 } // namespace
71 
73  std::unique_ptr<WindowBindingHandler> window_binding,
74  std::shared_ptr<WindowsProcTable> windows_proc_table)
75  : windows_proc_table_(std::move(windows_proc_table)) {
76  if (windows_proc_table_ == nullptr) {
77  windows_proc_table_ = std::make_shared<WindowsProcTable>();
78  }
79 
80  // Take the binding handler, and give it a pointer back to self.
81  binding_handler_ = std::move(window_binding);
82  binding_handler_->SetView(this);
83 }
84 
86  // The engine renders into the view's surface. The engine must be
87  // shutdown before the view's resources can be destroyed.
88  if (engine_) {
89  engine_->Stop();
90  }
91 
93 }
94 
96  FML_DCHECK(engine_ == nullptr);
97  FML_DCHECK(engine != nullptr);
98 
99  engine_ = engine;
100 
101  engine_->SetView(this);
102 
103  PhysicalWindowBounds bounds = binding_handler_->GetPhysicalWindowBounds();
104 
105  SendWindowMetrics(bounds.width, bounds.height,
106  binding_handler_->GetDpiScale());
107 }
108 
109 uint32_t FlutterWindowsView::GetFrameBufferId(size_t width, size_t height) {
110  // Called on an engine-controlled (non-platform) thread.
111  std::unique_lock<std::mutex> lock(resize_mutex_);
112 
113  if (resize_status_ != ResizeState::kResizeStarted) {
114  return kWindowFrameBufferID;
115  }
116 
117  if (resize_target_width_ == width && resize_target_height_ == height) {
118  // Platform thread is blocked for the entire duration until the
119  // resize_status_ is set to kDone.
120  engine_->surface_manager()->ResizeSurface(GetWindowHandle(), width, height,
121  NeedsVsync());
122  resize_status_ = ResizeState::kFrameGenerated;
123  }
124 
125  return kWindowFrameBufferID;
126 }
127 
128 void FlutterWindowsView::UpdateFlutterCursor(const std::string& cursor_name) {
129  binding_handler_->UpdateFlutterCursor(cursor_name);
130 }
131 
133  binding_handler_->SetFlutterCursor(cursor);
134 }
135 
137  if (resize_status_ == ResizeState::kDone) {
138  // Request new frame.
139  engine_->ScheduleFrame();
140  }
141 }
142 
143 void FlutterWindowsView::OnWindowSizeChanged(size_t width, size_t height) {
144  // Called on the platform thread.
145  std::unique_lock<std::mutex> lock(resize_mutex_);
146 
147  if (!engine_->surface_manager()) {
148  SendWindowMetrics(width, height, binding_handler_->GetDpiScale());
149  return;
150  }
151 
152  EGLint surface_width, surface_height;
153  engine_->surface_manager()->GetSurfaceDimensions(&surface_width,
154  &surface_height);
155 
156  bool surface_will_update =
157  SurfaceWillUpdate(surface_width, surface_height, width, height);
158  if (surface_will_update) {
159  resize_status_ = ResizeState::kResizeStarted;
160  resize_target_width_ = width;
161  resize_target_height_ = height;
162  }
163 
164  SendWindowMetrics(width, height, binding_handler_->GetDpiScale());
165 
166  if (surface_will_update) {
167  // Block the platform thread until:
168  // 1. GetFrameBufferId is called with the right frame size.
169  // 2. Any pending SwapBuffers calls have been invoked.
170  resize_cv_.wait_for(lock, kWindowResizeTimeout,
171  [&resize_status = resize_status_] {
172  return resize_status == ResizeState::kDone;
173  });
174  }
175 }
176 
178  ForceRedraw();
179 }
180 
182  double y,
183  FlutterPointerDeviceKind device_kind,
184  int32_t device_id,
185  int modifiers_state) {
186  engine_->keyboard_key_handler()->SyncModifiersIfNeeded(modifiers_state);
187  SendPointerMove(x, y, GetOrCreatePointerState(device_kind, device_id));
188 }
189 
191  double x,
192  double y,
193  FlutterPointerDeviceKind device_kind,
194  int32_t device_id,
195  FlutterPointerMouseButtons flutter_button) {
196  if (flutter_button != 0) {
197  auto state = GetOrCreatePointerState(device_kind, device_id);
198  state->buttons |= flutter_button;
199  SendPointerDown(x, y, state);
200  }
201 }
202 
204  double x,
205  double y,
206  FlutterPointerDeviceKind device_kind,
207  int32_t device_id,
208  FlutterPointerMouseButtons flutter_button) {
209  if (flutter_button != 0) {
210  auto state = GetOrCreatePointerState(device_kind, device_id);
211  state->buttons &= ~flutter_button;
212  SendPointerUp(x, y, state);
213  }
214 }
215 
217  double y,
218  FlutterPointerDeviceKind device_kind,
219  int32_t device_id) {
220  SendPointerLeave(x, y, GetOrCreatePointerState(device_kind, device_id));
221 }
222 
224  PointerLocation point = binding_handler_->GetPrimaryPointerLocation();
225  SendPointerPanZoomStart(device_id, point.x, point.y);
226 }
227 
229  double pan_x,
230  double pan_y,
231  double scale,
232  double rotation) {
233  SendPointerPanZoomUpdate(device_id, pan_x, pan_y, scale, rotation);
234 }
235 
237  SendPointerPanZoomEnd(device_id);
238 }
239 
240 void FlutterWindowsView::OnText(const std::u16string& text) {
241  SendText(text);
242 }
243 
245  int scancode,
246  int action,
247  char32_t character,
248  bool extended,
249  bool was_down,
252 }
253 
255  SendComposeBegin();
256 }
257 
259  SendComposeCommit();
260 }
261 
263  SendComposeEnd();
264 }
265 
266 void FlutterWindowsView::OnComposeChange(const std::u16string& text,
267  int cursor_pos) {
268  SendComposeChange(text, cursor_pos);
269 }
270 
272  double y,
273  double delta_x,
274  double delta_y,
275  int scroll_offset_multiplier,
276  FlutterPointerDeviceKind device_kind,
277  int32_t device_id) {
278  SendScroll(x, y, delta_x, delta_y, scroll_offset_multiplier, device_kind,
279  device_id);
280 }
281 
283  PointerLocation point = binding_handler_->GetPrimaryPointerLocation();
284  SendScrollInertiaCancel(device_id, point.x, point.y);
285 }
286 
288  engine_->UpdateSemanticsEnabled(enabled);
289 }
290 
291 gfx::NativeViewAccessible FlutterWindowsView::GetNativeViewAccessible() {
292  if (!accessibility_bridge_) {
293  return nullptr;
294  }
295 
296  return accessibility_bridge_->GetChildOfAXFragmentRoot();
297 }
298 
300  binding_handler_->OnCursorRectUpdated(rect);
301 }
302 
304  binding_handler_->OnResetImeComposing();
305 }
306 
307 // Sends new size information to FlutterEngine.
308 void FlutterWindowsView::SendWindowMetrics(size_t width,
309  size_t height,
310  double dpiScale) const {
311  FlutterWindowMetricsEvent event = {};
312  event.struct_size = sizeof(event);
313  event.width = width;
314  event.height = height;
315  event.pixel_ratio = dpiScale;
316  engine_->SendWindowMetricsEvent(event);
317 }
318 
320  PhysicalWindowBounds bounds = binding_handler_->GetPhysicalWindowBounds();
321 
322  SendWindowMetrics(bounds.width, bounds.height,
323  binding_handler_->GetDpiScale());
324 }
325 
326 FlutterWindowsView::PointerState* FlutterWindowsView::GetOrCreatePointerState(
327  FlutterPointerDeviceKind device_kind,
328  int32_t device_id) {
329  // Create a virtual pointer ID that is unique across all device types
330  // to prevent pointers from clashing in the engine's converter
331  // (lib/ui/window/pointer_data_packet_converter.cc)
332  int32_t pointer_id = (static_cast<int32_t>(device_kind) << 28) | device_id;
333 
334  auto [it, added] = pointer_states_.try_emplace(pointer_id, nullptr);
335  if (added) {
336  auto state = std::make_unique<PointerState>();
337  state->device_kind = device_kind;
338  state->pointer_id = pointer_id;
339  it->second = std::move(state);
340  }
341 
342  return it->second.get();
343 }
344 
345 // Set's |event_data|'s phase to either kMove or kHover depending on the current
346 // primary mouse button state.
347 void FlutterWindowsView::SetEventPhaseFromCursorButtonState(
348  FlutterPointerEvent* event_data,
349  const PointerState* state) const {
350  // For details about this logic, see FlutterPointerPhase in the embedder.h
351  // file.
352  if (state->buttons == 0) {
353  event_data->phase = state->flutter_state_is_down
354  ? FlutterPointerPhase::kUp
355  : FlutterPointerPhase::kHover;
356  } else {
357  event_data->phase = state->flutter_state_is_down
358  ? FlutterPointerPhase::kMove
359  : FlutterPointerPhase::kDown;
360  }
361 }
362 
363 void FlutterWindowsView::SendPointerMove(double x,
364  double y,
365  PointerState* state) {
366  FlutterPointerEvent event = {};
367  event.x = x;
368  event.y = y;
369 
370  SetEventPhaseFromCursorButtonState(&event, state);
371  SendPointerEventWithData(event, state);
372 }
373 
374 void FlutterWindowsView::SendPointerDown(double x,
375  double y,
376  PointerState* state) {
377  FlutterPointerEvent event = {};
378  event.x = x;
379  event.y = y;
380 
381  SetEventPhaseFromCursorButtonState(&event, state);
382  SendPointerEventWithData(event, state);
383 
384  state->flutter_state_is_down = true;
385 }
386 
387 void FlutterWindowsView::SendPointerUp(double x,
388  double y,
389  PointerState* state) {
390  FlutterPointerEvent event = {};
391  event.x = x;
392  event.y = y;
393 
394  SetEventPhaseFromCursorButtonState(&event, state);
395  SendPointerEventWithData(event, state);
396  if (event.phase == FlutterPointerPhase::kUp) {
397  state->flutter_state_is_down = false;
398  }
399 }
400 
401 void FlutterWindowsView::SendPointerLeave(double x,
402  double y,
403  PointerState* state) {
404  FlutterPointerEvent event = {};
405  event.x = x;
406  event.y = y;
407  event.phase = FlutterPointerPhase::kRemove;
408  SendPointerEventWithData(event, state);
409 }
410 
411 void FlutterWindowsView::SendPointerPanZoomStart(int32_t device_id,
412  double x,
413  double y) {
414  auto state =
415  GetOrCreatePointerState(kFlutterPointerDeviceKindTrackpad, device_id);
416  state->pan_zoom_start_x = x;
417  state->pan_zoom_start_y = y;
418  FlutterPointerEvent event = {};
419  event.x = x;
420  event.y = y;
421  event.phase = FlutterPointerPhase::kPanZoomStart;
422  SendPointerEventWithData(event, state);
423 }
424 
425 void FlutterWindowsView::SendPointerPanZoomUpdate(int32_t device_id,
426  double pan_x,
427  double pan_y,
428  double scale,
429  double rotation) {
430  auto state =
431  GetOrCreatePointerState(kFlutterPointerDeviceKindTrackpad, device_id);
432  FlutterPointerEvent event = {};
433  event.x = state->pan_zoom_start_x;
434  event.y = state->pan_zoom_start_y;
435  event.pan_x = pan_x;
436  event.pan_y = pan_y;
437  event.scale = scale;
438  event.rotation = rotation;
439  event.phase = FlutterPointerPhase::kPanZoomUpdate;
440  SendPointerEventWithData(event, state);
441 }
442 
443 void FlutterWindowsView::SendPointerPanZoomEnd(int32_t device_id) {
444  auto state =
445  GetOrCreatePointerState(kFlutterPointerDeviceKindTrackpad, device_id);
446  FlutterPointerEvent event = {};
447  event.x = state->pan_zoom_start_x;
448  event.y = state->pan_zoom_start_y;
449  event.phase = FlutterPointerPhase::kPanZoomEnd;
450  SendPointerEventWithData(event, state);
451 }
452 
453 void FlutterWindowsView::SendText(const std::u16string& text) {
454  engine_->text_input_plugin()->TextHook(text);
455 }
456 
457 void FlutterWindowsView::SendKey(int key,
458  int scancode,
459  int action,
460  char32_t character,
461  bool extended,
462  bool was_down,
463  KeyEventCallback callback) {
466  [=, callback = std::move(callback)](bool handled) {
467  if (!handled) {
468  engine_->text_input_plugin()->KeyboardHook(
470  }
471  callback(handled);
472  });
473 }
474 
475 void FlutterWindowsView::SendComposeBegin() {
476  engine_->text_input_plugin()->ComposeBeginHook();
477 }
478 
479 void FlutterWindowsView::SendComposeCommit() {
480  engine_->text_input_plugin()->ComposeCommitHook();
481 }
482 
483 void FlutterWindowsView::SendComposeEnd() {
484  engine_->text_input_plugin()->ComposeEndHook();
485 }
486 
487 void FlutterWindowsView::SendComposeChange(const std::u16string& text,
488  int cursor_pos) {
489  engine_->text_input_plugin()->ComposeChangeHook(text, cursor_pos);
490 }
491 
492 void FlutterWindowsView::SendScroll(double x,
493  double y,
494  double delta_x,
495  double delta_y,
496  int scroll_offset_multiplier,
497  FlutterPointerDeviceKind device_kind,
498  int32_t device_id) {
499  auto state = GetOrCreatePointerState(device_kind, device_id);
500 
501  FlutterPointerEvent event = {};
502  event.x = x;
503  event.y = y;
504  event.signal_kind = FlutterPointerSignalKind::kFlutterPointerSignalKindScroll;
505  event.scroll_delta_x = delta_x * scroll_offset_multiplier;
506  event.scroll_delta_y = delta_y * scroll_offset_multiplier;
507  SetEventPhaseFromCursorButtonState(&event, state);
508  SendPointerEventWithData(event, state);
509 }
510 
511 void FlutterWindowsView::SendScrollInertiaCancel(int32_t device_id,
512  double x,
513  double y) {
514  auto state =
515  GetOrCreatePointerState(kFlutterPointerDeviceKindTrackpad, device_id);
516 
517  FlutterPointerEvent event = {};
518  event.x = x;
519  event.y = y;
520  event.signal_kind =
521  FlutterPointerSignalKind::kFlutterPointerSignalKindScrollInertiaCancel;
522  SetEventPhaseFromCursorButtonState(&event, state);
523  SendPointerEventWithData(event, state);
524 }
525 
526 void FlutterWindowsView::SendPointerEventWithData(
527  const FlutterPointerEvent& event_data,
528  PointerState* state) {
529  // If sending anything other than an add, and the pointer isn't already added,
530  // synthesize an add to satisfy Flutter's expectations about events.
531  if (!state->flutter_state_is_added &&
532  event_data.phase != FlutterPointerPhase::kAdd) {
533  FlutterPointerEvent event = {};
534  event.phase = FlutterPointerPhase::kAdd;
535  event.x = event_data.x;
536  event.y = event_data.y;
537  event.buttons = 0;
538  SendPointerEventWithData(event, state);
539  }
540 
541  // Don't double-add (e.g., if events are delivered out of order, so an add has
542  // already been synthesized).
543  if (state->flutter_state_is_added &&
544  event_data.phase == FlutterPointerPhase::kAdd) {
545  return;
546  }
547 
548  FlutterPointerEvent event = event_data;
549  event.device_kind = state->device_kind;
550  event.device = state->pointer_id;
551  event.buttons = state->buttons;
552  // TODO(dkwingsmt): Use the correct view ID for pointer events once the
553  // Windows embedder supports multiple views.
554  // https://github.com/flutter/flutter/issues/138179
555  event.view_id = flutter::kFlutterImplicitViewId;
556 
557  // Set metadata that's always the same regardless of the event.
558  event.struct_size = sizeof(event);
559  event.timestamp =
560  std::chrono::duration_cast<std::chrono::microseconds>(
561  std::chrono::high_resolution_clock::now().time_since_epoch())
562  .count();
563 
564  engine_->SendPointerEvent(event);
565 
566  if (event_data.phase == FlutterPointerPhase::kAdd) {
567  state->flutter_state_is_added = true;
568  } else if (event_data.phase == FlutterPointerPhase::kRemove) {
569  auto it = pointer_states_.find(state->pointer_id);
570  if (it != pointer_states_.end()) {
571  pointer_states_.erase(it);
572  }
573  }
574 }
575 
577  // Called on an engine-controlled (non-platform) thread.
578  std::unique_lock<std::mutex> lock(resize_mutex_);
579 
580  switch (resize_status_) {
581  // SwapBuffer requests during resize are ignored until the frame with the
582  // right dimensions has been generated. This is marked with
583  // kFrameGenerated resize status.
584  case ResizeState::kResizeStarted:
585  return false;
586  case ResizeState::kFrameGenerated: {
587  bool visible = binding_handler_->IsVisible();
588  bool swap_buffers_result;
589  // For visible windows swap the buffers while resize handler is waiting.
590  // For invisible windows unblock the handler first and then swap buffers.
591  // SwapBuffers waits for vsync and there's no point doing that for
592  // invisible windows.
593  if (visible) {
594  swap_buffers_result = engine_->surface_manager()->SwapBuffers();
595  }
596  resize_status_ = ResizeState::kDone;
597  lock.unlock();
598  resize_cv_.notify_all();
599 
600  // Blocking the raster thread until DWM flushes alleviates glitches where
601  // previous size surface is stretched over current size view.
602  windows_proc_table_->DwmFlush();
603 
604  if (!visible) {
605  swap_buffers_result = engine_->surface_manager()->SwapBuffers();
606  }
607  return swap_buffers_result;
608  }
609  case ResizeState::kDone:
610  default:
611  return engine_->surface_manager()->SwapBuffers();
612  }
613 }
614 
615 bool FlutterWindowsView::PresentSoftwareBitmap(const void* allocation,
616  size_t row_bytes,
617  size_t height) {
618  return binding_handler_->OnBitmapSurfaceUpdated(allocation, row_bytes,
619  height);
620 }
621 
623  if (engine_ && engine_->surface_manager()) {
624  PhysicalWindowBounds bounds = binding_handler_->GetPhysicalWindowBounds();
625  engine_->surface_manager()->CreateSurface(GetWindowHandle(), bounds.width,
626  bounds.height);
627 
628  UpdateVsync(*engine_, NeedsVsync());
629 
630  resize_target_width_ = bounds.width;
631  resize_target_height_ = bounds.height;
632  }
633 }
634 
636  if (engine_ && engine_->surface_manager()) {
637  engine_->surface_manager()->DestroySurface();
638  }
639 }
640 
642  engine_->UpdateHighContrastMode();
643 }
644 
646  return binding_handler_->GetWindowHandle();
647 }
648 
650  return engine_;
651 }
652 
653 void FlutterWindowsView::AnnounceAlert(const std::wstring& text) {
654  auto alert_delegate = binding_handler_->GetAlertDelegate();
655  if (!alert_delegate) {
656  return;
657  }
658  alert_delegate->SetText(fml::WideStringToUtf16(text));
659  ui::AXPlatformNodeWin* alert_node = binding_handler_->GetAlert();
660  NotifyWinEventWrapper(alert_node, ax::mojom::Event::kAlert);
661 }
662 
663 void FlutterWindowsView::NotifyWinEventWrapper(ui::AXPlatformNodeWin* node,
664  ax::mojom::Event event) {
665  if (node) {
666  node->NotifyAccessibilityEvent(event);
667  }
668 }
669 
670 ui::AXFragmentRootDelegateWin* FlutterWindowsView::GetAxFragmentRootDelegate() {
671  return accessibility_bridge_.get();
672 }
673 
674 ui::AXPlatformNodeWin* FlutterWindowsView::AlertNode() const {
675  return binding_handler_->GetAlert();
676 }
677 
678 std::shared_ptr<AccessibilityBridgeWindows>
680  return std::make_shared<AccessibilityBridgeWindows>(this);
681 }
682 
684  if (semantics_enabled_ != enabled) {
685  semantics_enabled_ = enabled;
686 
687  if (!semantics_enabled_ && accessibility_bridge_) {
688  accessibility_bridge_.reset();
689  } else if (semantics_enabled_ && !accessibility_bridge_) {
690  accessibility_bridge_ = CreateAccessibilityBridge();
691  }
692  }
693 }
694 
696  UpdateVsync(*engine_, NeedsVsync());
697 }
698 
700  if (engine_) {
701  engine_->OnWindowStateEvent(hwnd, event);
702  }
703 }
704 
705 bool FlutterWindowsView::NeedsVsync() const {
706  // If the Desktop Window Manager composition is enabled,
707  // the system itself synchronizes with vsync.
708  // See: https://learn.microsoft.com/windows/win32/dwm/composition-ovw
709  return !windows_proc_table_->DwmIsCompositionEnabled();
710 }
711 
712 } // namespace flutter
flutter::FlutterWindowsView::OnPointerMove
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Definition: flutter_windows_view.cc:181
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virtual void ComposeBeginHook()
Definition: text_input_plugin.cc:125
flutter::TextInputPlugin::ComposeChangeHook
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Definition: text_input_plugin.cc:192
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void OnPointerUp(double x, double y, FlutterPointerDeviceKind device_kind, int32_t device_id, FlutterPointerMouseButtons button) override
Definition: flutter_windows_view.cc:203
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WindowStateEvent
An event representing a change in window state that may update the.
Definition: windows_lifecycle_manager.h:24
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Definition: flutter_windows_view.cc:699
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Definition: flutter_windows_view.cc:622
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void OnWindowSizeChanged(size_t width, size_t height) override
Definition: flutter_windows_view.cc:143
flutter::FlutterWindowsView::OnUpdateSemanticsEnabled
virtual void OnUpdateSemanticsEnabled(bool enabled) override
Definition: flutter_windows_view.cc:287
flutter::FlutterWindowsView::OnComposeCommit
void OnComposeCommit() override
Definition: flutter_windows_view.cc:258
flutter::FlutterWindowsEngine::SendPointerEvent
void SendPointerEvent(const FlutterPointerEvent &event)
Definition: flutter_windows_engine.cc:514
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Definition: keyboard_key_handler_unittests.cc:115
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