| Flutter Windows Embedder |

Public Member Functions | Protected Member Functions | Friends | List of all members
flutter::FlutterWindowsEngine Class Reference

`#include <flutter_windows_engine.h>`

## Public Member Functions
| FlutterWindowsEngine (const FlutterProjectBundle &project, std::shared_ptr< WindowsProcTable > windows_proc_table=nullptr)
virtual | ~FlutterWindowsEngine ()
bool | Run ()
bool | Run (std::string_view entrypoint)
virtual bool | running () const
virtual bool | Stop ()
std::unique_ptr< FlutterWindowsView > | CreateView (std::unique_ptr< WindowBindingHandler > window)
virtual void | RemoveView (FlutterViewId view_id)
FlutterWindowsView * | view (FlutterViewId view_id) const
FlutterDesktopPluginRegistrarRef | GetRegistrar ()
void | AddPluginRegistrarDestructionCallback (FlutterDesktopOnPluginRegistrarDestroyed callback, FlutterDesktopPluginRegistrarRef registrar)
void | SetSwitches (const std::vector< std::string > &switches)
FlutterDesktopMessengerRef | messenger ()
IncomingMessageDispatcher * | message_dispatcher ()
TaskRunner * | task_runner ()
BinaryMessenger * | messenger_wrapper ()
FlutterWindowsTextureRegistrar * | texture_registrar ()
egl::Manager * | egl_manager () const
WindowProcDelegateManager * | window_proc_delegate_manager ()
void | SendWindowMetricsEvent (const FlutterWindowMetricsEvent &event)
void | SendPointerEvent (const FlutterPointerEvent &event)
void | SendKeyEvent (const FlutterKeyEvent &event, FlutterKeyEventCallback callback, void *user_data)
KeyboardHandlerBase * | keyboard_key_handler ()
TextInputPlugin * | text_input_plugin ()
bool | SendPlatformMessage (const char *channel, const uint8_t *message, const size_t message_size, const FlutterDesktopBinaryReply reply, void *user_data)
void | SendPlatformMessageResponse (const FlutterDesktopMessageResponseHandle *handle, const uint8_t *data, size_t data_length)
void | HandlePlatformMessage (const FlutterPlatformMessage *)
void | ReloadSystemFonts ()
void | ScheduleFrame ()
void | SetNextFrameCallback (fml::closure callback)
bool | RegisterExternalTexture (int64_t texture_id)
bool | UnregisterExternalTexture (int64_t texture_id)
bool | MarkExternalTextureFrameAvailable (int64_t texture_id)
virtual bool | PostRasterThreadTask (fml::closure callback) const
void | OnVsync (intptr_t baton)
bool | DispatchSemanticsAction (uint64_t id, FlutterSemanticsAction action, fml::MallocMapping data)
void | UpdateSemanticsEnabled (bool enabled)
bool | semantics_enabled () const
void | UpdateAccessibilityFeatures ()
void | UpdateHighContrastMode ()
bool | high_contrast_enabled () const
void | SetRootIsolateCreateCallback (const fml::closure &callback)
std::string | GetExecutableName () const
void | OnQuit (std::optional< HWND > hwnd, std::optional< WPARAM > wparam, std::optional< LPARAM > lparam, UINT exit_code)
void | RequestApplicationQuit (HWND hwnd, WPARAM wparam, LPARAM lparam, AppExitType exit_type)
void | OnDwmCompositionChanged ()
void | OnWindowStateEvent (HWND hwnd, WindowStateEvent event)
std::optional< LRESULT > | ProcessExternalWindowMessage (HWND hwnd, UINT message, WPARAM wparam, LPARAM lparam)
WindowsLifecycleManager * | lifecycle_manager ()
std::shared_ptr< WindowsProcTable > | windows_proc_table ()

## Protected Member Functions
virtual std::unique_ptr< KeyboardHandlerBase > | CreateKeyboardKeyHandler (BinaryMessenger *messenger, KeyboardKeyEmbedderHandler::GetKeyStateHandler get_key_state, KeyboardKeyEmbedderHandler::MapVirtualKeyToScanCode map_vk_to_scan)
virtual std::unique_ptr< TextInputPlugin > | CreateTextInputPlugin (BinaryMessenger *messenger)
void | OnPreEngineRestart ()
virtual void | OnChannelUpdate (std::string name, bool listening)

## Friends
class | EngineModifier

## Detailed Description

Definition at line 90 of file flutter_windows_engine.h.

## Constructor & Destructor Documentation

## ◆ FlutterWindowsEngine()

flutter::FlutterWindowsEngine::FlutterWindowsEngine | ( | const FlutterProjectBundle & | project,
|  | std::shared_ptr< WindowsProcTable > | windows_proc_table = `nullptr`
| ) |  |

Definition at line 148 of file flutter_windows_engine.cc.

151 : project_(std::make_unique<FlutterProjectBundle>(project)),
152 windows_proc_table_(std::move(windows_proc_table)),
153 aot_data_(nullptr, nullptr),
154 lifecycle_manager_(std::make_unique<WindowsLifecycleManager>(this)) {
155 if (windows_proc_table_ == nullptr) {
156 windows_proc_table_ = std::make_shared<WindowsProcTable>();
157 }
158
159 gl_ = egl::ProcTable::Create();
160
161 embedder_api_.struct_size = sizeof(FlutterEngineProcTable);
162 FlutterEngineGetProcAddresses(&embedder_api_);
163
164 task_runner_ =
165 std::make_unique<TaskRunner>(
166 embedder_api_.GetCurrentTime, [this](const auto* task) {
167 if (!engine_) {
168 FML_LOG(ERROR)
169 << "Cannot post an engine task when engine is not running.";
170 return;
171 }
172 if (embedder_api_.RunTask(engine_, task) != kSuccess) {
173 FML_LOG(ERROR) << "Failed to post an engine task.";
174 }
175 });
176
177 // Set up the legacy structs backing the API handles.
178 messenger_ =
179 fml::RefPtr<FlutterDesktopMessenger>(new FlutterDesktopMessenger());
180 messenger_->SetEngine(this);
181 plugin_registrar_ = std::make_unique<FlutterDesktopPluginRegistrar>();
182 plugin_registrar_->engine = this;
183
184 messenger_wrapper_ =
185 std::make_unique<BinaryMessengerImpl>(messenger_->ToRef());
186 message_dispatcher_ =
187 std::make_unique<IncomingMessageDispatcher>(messenger_->ToRef());
188
189 texture_registrar_ =
190 std::make_unique<FlutterWindowsTextureRegistrar>(this, gl_);
191
192 // Check for impeller support.
193 auto& switches = project_->GetSwitches();
194 enable_impeller_ = std::find(switches.begin(), switches.end(),
195 "--enable-impeller=true") != switches.end();
196
197 egl_manager_ = egl::Manager::Create();
198 window_proc_delegate_manager_ = std::make_unique<WindowProcDelegateManager>();
199 window_proc_delegate_manager_->RegisterTopLevelWindowProcDelegate(
200 [](HWND hwnd, UINT msg, WPARAM wpar, LPARAM lpar, void* user_data,
201 LRESULT* result) {
202 BASE_DCHECK(user_data);
203 FlutterWindowsEngine* that =
204 static_cast<FlutterWindowsEngine*>(user_data);
205 BASE_DCHECK(that->lifecycle_manager_);
206 return that->lifecycle_manager_->WindowProc(hwnd, msg, wpar, lpar,
207 result);
208 },
209 static_cast<void*>(this));
210
211 // Set up internal channels.
212 // TODO: Replace this with an embedder.h API. See
213 // https://github.com/flutter/flutter/issues/71099
214 internal_plugin_registrar_ =
215 std::make_unique<PluginRegistrar>(plugin_registrar_.get());
216
217 accessibility_plugin_ = std::make_unique<AccessibilityPlugin>(this);
218 AccessibilityPlugin::SetUp(messenger_wrapper_.get(),
219 accessibility_plugin_.get());
220
221 cursor_handler_ =
222 std::make_unique<CursorHandler>(messenger_wrapper_.get(), this);
223 platform_handler_ =
224 std::make_unique<PlatformHandler>(messenger_wrapper_.get(), this);
225 settings_plugin_ = std::make_unique<SettingsPlugin>(messenger_wrapper_.get(),
226 task_runner_.get());
227 }
flutter::AccessibilityPlugin::SetUp
static void SetUp(BinaryMessenger *binary_messenger, AccessibilityPlugin *plugin)
Definition: accessibility_plugin.cc:76
flutter::FlutterWindowsEngine::windows_proc_table
std::shared_ptr< WindowsProcTable > windows_proc_table()
Definition: flutter_windows_engine.h:297
flutter::FlutterWindowsEngine::FlutterWindowsEngine
FlutterWindowsEngine(const FlutterProjectBundle &project, std::shared_ptr< WindowsProcTable > windows_proc_table=nullptr)
Definition: flutter_windows_engine.cc:148
flutter::egl::Manager::Create
static std::unique_ptr< Manager > Create()
Definition: manager.cc:17
flutter::egl::ProcTable::Create
static std::shared_ptr< ProcTable > Create()
Definition: proc_table.cc:12
user_data
void * user_data
Definition: flutter_windows_view_unittests.cc:53

References flutter::egl::ProcTable::Create().

## ◆ ~FlutterWindowsEngine()

flutter::FlutterWindowsEngine::~FlutterWindowsEngine | ( |  | ) |
| virtual

Definition at line 229 of file flutter_windows_engine.cc.

229 {
230 messenger_->SetEngine(nullptr);
231 Stop();
232 }
flutter::FlutterWindowsEngine::Stop
virtual bool Stop()
Definition: flutter_windows_engine.cc:483

## Member Function Documentation

## ◆ AddPluginRegistrarDestructionCallback()

void flutter::FlutterWindowsEngine::AddPluginRegistrarDestructionCallback | ( | FlutterDesktopOnPluginRegistrarDestroyed | callback,
|  | FlutterDesktopPluginRegistrarRef | registrar
| ) |  |

Definition at line 673 of file flutter_windows_engine.cc.

675 {
676 plugin_registrar_destruction_callbacks_[callback] = registrar;
677 }
callback
FlutterDesktopBinaryReply callback
Definition: flutter_windows_view_unittests.cc:52

References callback.

Referenced by FlutterDesktopPluginRegistrarSetDestructionHandler().

## ◆ CreateKeyboardKeyHandler()

std::unique_ptr< KeyboardHandlerBase > flutter::FlutterWindowsEngine::CreateKeyboardKeyHandler | ( | BinaryMessenger * | messenger,
|  | KeyboardKeyEmbedderHandler::GetKeyStateHandler | get_key_state,
|  | KeyboardKeyEmbedderHandler::MapVirtualKeyToScanCode | map_vk_to_scan
| ) |  |
| protectedvirtual

Definition at line 818 of file flutter_windows_engine.cc.

821 {
822 auto keyboard_key_handler = std::make_unique<KeyboardKeyHandler>(messenger);
823 keyboard_key_handler->AddDelegate(
824 std::make_unique<KeyboardKeyEmbedderHandler>(
825 [this](const FlutterKeyEvent& event, FlutterKeyEventCallback callback,
826 void* user_data) {
827 return SendKeyEvent(event, callback, user_data);
828 },
829 get_key_state, map_vk_to_scan));
830 keyboard_key_handler->AddDelegate(
831 std::make_unique<KeyboardKeyChannelHandler>(messenger));
832 keyboard_key_handler->InitKeyboardChannel();
833 return keyboard_key_handler;
834 }
flutter::FlutterWindowsEngine::messenger
FlutterDesktopMessengerRef messenger()
Definition: flutter_windows_engine.h:149
flutter::FlutterWindowsEngine::keyboard_key_handler
KeyboardHandlerBase * keyboard_key_handler()
Definition: flutter_windows_engine.h:182
flutter::FlutterWindowsEngine::SendKeyEvent
void SendKeyEvent(const FlutterKeyEvent &event, FlutterKeyEventCallback callback, void *user_data)
Definition: flutter_windows_engine.cc:692

References callback, and user_data.

## ◆ CreateTextInputPlugin()

std::unique_ptr< TextInputPlugin > flutter::FlutterWindowsEngine::CreateTextInputPlugin | ( | BinaryMessenger * | messenger | ) |
| protectedvirtual

Definition at line 836 of file flutter_windows_engine.cc.

837 {
838 return std::make_unique<TextInputPlugin>(messenger, this);
839 }

## ◆ CreateView()

std::unique_ptr< FlutterWindowsView > flutter::FlutterWindowsEngine::CreateView | ( | std::unique_ptr< WindowBindingHandler > | window | ) |

Definition at line 496 of file flutter_windows_engine.cc.

497 {
498 auto view_id = next_view_id_;
499 auto view = std::make_unique<FlutterWindowsView>(
500 view_id, this, std::move(window), windows_proc_table_);
501
502 view->CreateRenderSurface();
503
504 next_view_id_++;
505
506 {
507 // Add the view to the embedder. This must happen before the engine
508 // is notified the view exists and starts presenting to it.
509 std::unique_lock write_lock(views_mutex_);
510 FML_DCHECK(views_.find(view_id) == views_.end());
511 views_[view_id] = view.get();
512 }
513
514 if (!view->IsImplicitView()) {
515 FML_DCHECK(running());
516
517 struct Captures {
518 fml::AutoResetWaitableEvent latch;
519 bool added;
520 };
521 Captures captures = {};
522
523 FlutterWindowMetricsEvent metrics = view->CreateWindowMetricsEvent();
524
525 FlutterAddViewInfo info = {};
526 info.struct_size = sizeof(FlutterAddViewInfo);
527 info.view_id = view_id;
528 info.view_metrics = &metrics;
529 info.user_data = &captures;
530 info.add_view_callback = [](const FlutterAddViewResult* result) {
531 Captures* captures = reinterpret_cast<Captures*>(result->user_data);
532 captures->added = result->added;
533 captures->latch.Signal();
534 };
535
536 FlutterEngineResult result = embedder_api_.AddView(engine_, &info);
537 if (result != kSuccess) {
538 FML_LOG(ERROR)
539 << "Starting the add view operation failed. FlutterEngineAddView "
540 "returned an unexpected result: "
541 << result << ". This indicates a bug in the Windows embedder.";
542 FML_DCHECK(false);
543 return nullptr;
544 }
545
546 // Block the platform thread until the engine has added the view.
547 // TODO(loicsharma): This blocks the platform thread eagerly and can
548 // cause unnecessary delay in input processing. Instead, this should block
549 // lazily only when the app does an operation which needs the view.
550 // https://github.com/flutter/flutter/issues/146248
551 captures.latch.Wait();
552
553 if (!captures.added) {
554 // Adding the view failed. Update the embedder's state to match the
555 // engine's state. This is unexpected and indicates a bug in the Windows
556 // embedder.
557 FML_LOG(ERROR) << "FlutterEngineAddView failed to add view";
558 std::unique_lock write_lock(views_mutex_);
559 views_.erase(view_id);
560 return nullptr;
561 }
562 }
563
564 return std::move(view);
565 }
flutter::FlutterWindowsEngine::view
FlutterWindowsView * view(FlutterViewId view_id) const
Definition: flutter_windows_engine.cc:657
flutter::FlutterWindowsEngine::running
virtual bool running() const
Definition: flutter_windows_engine.h:117
flutter::FlutterWindowsView::CreateRenderSurface
void CreateRenderSurface()
Definition: flutter_windows_view.cc:700
flutter::FlutterWindowsView::IsImplicitView
bool IsImplicitView() const
Definition: flutter_windows_view.cc:696
flutter::FlutterWindowsView::CreateWindowMetricsEvent
FlutterWindowMetricsEvent CreateWindowMetricsEvent() const
Definition: flutter_windows_view.cc:375

Referenced by CreateViewController().

## ◆ DispatchSemanticsAction()

bool flutter::FlutterWindowsEngine::DispatchSemanticsAction | ( | uint64_t | id,
|  | FlutterSemanticsAction | action,
|  | fml::MallocMapping | data
| ) |  |

Definition at line 877 of file flutter_windows_engine.cc.

880 {
881 return (embedder_api_.DispatchSemanticsAction(engine_, target, action,
882 data.GetMapping(),
883 data.GetSize()) == kSuccess);
884 }
action
int action
Definition: keyboard_key_handler_unittests.cc:116

Referenced by flutter::AccessibilityBridgeWindows::DispatchAccessibilityAction().

## ◆ egl_manager()

egl::Manager* flutter::FlutterWindowsEngine::egl_manager | ( |  | ) | const
| inline

Definition at line 165 of file flutter_windows_engine.h.

165 { return egl_manager_.get(); }

Referenced by flutter::FlutterWindowsView::CreateRenderSurface(), FlutterDesktopViewGetGraphicsAdapter(), flutter::FlutterWindowsView::OnWindowSizeChanged(), and flutter::FlutterWindowsTextureRegistrar::RegisterTexture().

## ◆ GetExecutableName()

std::string flutter::FlutterWindowsEngine::GetExecutableName | ( |  | ) | const

Definition at line 903 of file flutter_windows_engine.cc.

903 {
904 std::pair<bool, std::string> result = fml::paths::GetExecutablePath();
905 if (result.first) {
906 const std::string& executable_path = result.second;
907 size_t last_separator = executable_path.find_last_of("/\\");
908 if (last_separator == std::string::npos ||
909 last_separator == executable_path.size() - 1) {
910 return executable_path;
911 }
912 return executable_path.substr(last_separator + 1);
913 }
914 return "Flutter";
915 }

## ◆ GetRegistrar()

FlutterDesktopPluginRegistrarRef flutter::FlutterWindowsEngine::GetRegistrar | ( |  | ) |

Definition at line 669 of file flutter_windows_engine.cc.

669 {
670 return plugin_registrar_.get();
671 }

Referenced by FlutterDesktopEngineGetPluginRegistrar().

## ◆ HandlePlatformMessage()

void flutter::FlutterWindowsEngine::HandlePlatformMessage | ( | const FlutterPlatformMessage * | engine_message | ) |

Definition at line 741 of file flutter_windows_engine.cc.

742 {
743 if (engine_message->struct_size != sizeof(FlutterPlatformMessage)) {
744 FML_LOG(ERROR) << "Invalid message size received. Expected: "
745 << sizeof(FlutterPlatformMessage) << " but received "
746 << engine_message->struct_size;
747 return;
748 }
749
750 auto message = ConvertToDesktopMessage(*engine_message);
751
752 message_dispatcher_->HandleMessage(message, [this] {}, [this] {});
753 }
message
Win32Message message
Definition: keyboard_unittests.cc:137

References message.

Referenced by Run().

## ◆ high_contrast_enabled()

bool flutter::FlutterWindowsEngine::high_contrast_enabled | ( |  | ) | const
| inline

Definition at line 248 of file flutter_windows_engine.h.

248 { return high_contrast_enabled_; }

## ◆ keyboard_key_handler()

KeyboardHandlerBase* flutter::FlutterWindowsEngine::keyboard_key_handler | ( |  | ) |
| inline

Definition at line 182 of file flutter_windows_engine.h.

182 {
183 return keyboard_key_handler_.get();
184 }

Referenced by flutter::FlutterWindowsView::OnPointerMove().

## ◆ lifecycle_manager()

WindowsLifecycleManager* flutter::FlutterWindowsEngine::lifecycle_manager | ( |  | ) |
| inline

Definition at line 293 of file flutter_windows_engine.h.

293 {
294 return lifecycle_manager_.get();
295 }

## ◆ MarkExternalTextureFrameAvailable()

bool flutter::FlutterWindowsEngine::MarkExternalTextureFrameAvailable | ( | int64_t | texture_id | ) |

Definition at line 851 of file flutter_windows_engine.cc.

852 {
853 return (embedder_api_.MarkExternalTextureFrameAvailable(
854 engine_, texture_id) == kSuccess);
855 }
texture_id
uint32_t texture_id
Definition: compositor_opengl.cc:20

## ◆ message_dispatcher()

IncomingMessageDispatcher* flutter::FlutterWindowsEngine::message_dispatcher | ( |  | ) |
| inline

Definition at line 151 of file flutter_windows_engine.h.

151 {
152 return message_dispatcher_.get();
153 }

Referenced by FlutterDesktopMessengerSetCallback().

## ◆ messenger()

FlutterDesktopMessengerRef flutter::FlutterWindowsEngine::messenger | ( |  | ) |
| inline

Definition at line 149 of file flutter_windows_engine.h.

149 { return messenger_->ToRef(); }

Referenced by FlutterDesktopEngineGetMessenger(), and FlutterDesktopPluginRegistrarGetMessenger().

## ◆ messenger_wrapper()

BinaryMessenger* flutter::FlutterWindowsEngine::messenger_wrapper | ( |  | ) |
| inline

Definition at line 157 of file flutter_windows_engine.h.

157 { return messenger_wrapper_.get(); }

## ◆ OnChannelUpdate()

void flutter::FlutterWindowsEngine::OnChannelUpdate | ( | std::string | name,
|  | bool | listening
| ) |  |
| protectedvirtual

Definition at line 979 of file flutter_windows_engine.cc.

979 {
980 if (name == "flutter/platform" && listening) {
981 lifecycle_manager_->BeginProcessingExit();
982 } else if (name == "flutter/lifecycle" && listening) {
983 lifecycle_manager_->BeginProcessingLifecycle();
984 }
985 }

## ◆ OnDwmCompositionChanged()

void flutter::FlutterWindowsEngine::OnDwmCompositionChanged | ( |  | ) |

Definition at line 954 of file flutter_windows_engine.cc.

954 {
955 std::shared_lock read_lock(views_mutex_);
956
957 for (auto iterator = views_.begin(); iterator != views_.end(); iterator++) {
958 iterator->second->OnDwmCompositionChanged();
959 }
960 }

Referenced by flutter::WindowsLifecycleManager::WindowProc().

## ◆ OnPreEngineRestart()

void flutter::FlutterWindowsEngine::OnPreEngineRestart | ( |  | ) |
| protected

Definition at line 898 of file flutter_windows_engine.cc.

898 {
899 // Reset the keyboard's state on hot restart.
900 InitializeKeyboard();
901 }

Referenced by Run().

## ◆ OnQuit()

void flutter::FlutterWindowsEngine::OnQuit | ( | std::optional< HWND > | hwnd,
|  | std::optional< WPARAM > | wparam,
|  | std::optional< LPARAM > | lparam,
|  | UINT | exit_code
| ) |  |

Definition at line 947 of file flutter_windows_engine.cc.

950 {
951 lifecycle_manager_->Quit(hwnd, wparam, lparam, exit_code);
952 }

Referenced by flutter::PlatformHandler::QuitApplication().

## ◆ OnVsync()

void flutter::FlutterWindowsEngine::OnVsync | ( | intptr_t | baton | ) |

Definition at line 629 of file flutter_windows_engine.cc.

629 {
630 std::chrono::nanoseconds current_time =
631 std::chrono::nanoseconds(embedder_api_.GetCurrentTime());
632 std::chrono::nanoseconds frame_interval = FrameInterval();
633 auto next = SnapToNextTick(current_time, start_time_, frame_interval);
634 embedder_api_.OnVsync(engine_, baton, next.count(),
635 (next + frame_interval).count());
636 }

Referenced by Run().

## ◆ OnWindowStateEvent()

void flutter::FlutterWindowsEngine::OnWindowStateEvent | ( | HWND | hwnd,
|  | WindowStateEvent | event
| ) |  |

Definition at line 962 of file flutter_windows_engine.cc.

963 {
964 lifecycle_manager_->OnWindowStateEvent(hwnd, event);
965 }

Referenced by flutter::FlutterWindowsView::OnWindowStateEvent(), and flutter::FlutterWindowsView::~FlutterWindowsView().

## ◆ PostRasterThreadTask()

bool flutter::FlutterWindowsEngine::PostRasterThreadTask | ( | fml::closure | callback | ) | const
| virtual

Definition at line 857 of file flutter_windows_engine.cc.

857 {
858 struct Captures {
859 fml::closure callback;
860 };
861 auto captures = new Captures();
862 captures->callback = std::move(callback);
863 if (embedder_api_.PostRenderThreadTask(
864 engine_,
865 [](void* opaque) {
866 auto captures = reinterpret_cast<Captures*>(opaque);
867 captures->callback();
868 delete captures;
869 },
870 captures) == kSuccess) {
871 return true;
872 }
873 delete captures;
874 return false;
875 }

References callback.

Referenced by flutter::FlutterWindowsTextureRegistrar::UnregisterTexture().

## ◆ ProcessExternalWindowMessage()

std::optional< LRESULT > flutter::FlutterWindowsEngine::ProcessExternalWindowMessage | ( | HWND | hwnd,
|  | UINT | message,
|  | WPARAM | wparam,
|  | LPARAM | lparam
| ) |  |

Definition at line 967 of file flutter_windows_engine.cc.

971 {
972 if (lifecycle_manager_) {
973 return lifecycle_manager_->ExternalWindowMessage(hwnd, message, wparam,
974 lparam);
975 }
976 return std::nullopt;
977 }

References message.

Referenced by FlutterDesktopEngineProcessExternalWindowMessage().

## ◆ RegisterExternalTexture()

bool flutter::FlutterWindowsEngine::RegisterExternalTexture | ( | int64_t | texture_id | ) |

Definition at line 841 of file flutter_windows_engine.cc.

841 {
842 return (embedder_api_.RegisterExternalTexture(engine_, texture_id) ==
843 kSuccess);
844 }

## ◆ ReloadSystemFonts()

void flutter::FlutterWindowsEngine::ReloadSystemFonts | ( |  | ) |

Definition at line 755 of file flutter_windows_engine.cc.

755 {
756 embedder_api_.ReloadSystemFonts(engine_);
757 }

Referenced by FlutterDesktopEngineReloadSystemFonts().

## ◆ RemoveView()

void flutter::FlutterWindowsEngine::RemoveView | ( | FlutterViewId | view_id | ) |
| virtual

Definition at line 567 of file flutter_windows_engine.cc.

567 {
568 FML_DCHECK(running());
569
570 // Notify the engine to stop rendering to the view if it isn't the implicit
571 // view. The engine and framework assume the implicit view always exists and
572 // can continue presenting.
573 if (view_id != kImplicitViewId) {
574 struct Captures {
575 fml::AutoResetWaitableEvent latch;
576 bool removed;
577 };
578 Captures captures = {};
579
580 FlutterRemoveViewInfo info = {};
581 info.struct_size = sizeof(FlutterRemoveViewInfo);
582 info.view_id = view_id;
583 info.user_data = &captures;
584 info.remove_view_callback = [](const FlutterRemoveViewResult* result) {
585 // This is invoked on an engine thread. If
586 // |FlutterRemoveViewResult.removed| is `true`, the engine guarantees the
587 // view won't be presented.
588 Captures* captures = reinterpret_cast<Captures*>(result->user_data);
589 captures->removed = result->removed;
590 captures->latch.Signal();
591 };
592
593 FlutterEngineResult result = embedder_api_.RemoveView(engine_, &info);
594 if (result != kSuccess) {
595 FML_LOG(ERROR) << "Starting the remove view operation failed. "
596 "FlutterEngineRemoveView "
597 "returned an unexpected result: "
598 << result
599 << ". This indicates a bug in the Windows embedder.";
600 FML_DCHECK(false);
601 return;
602 }
603
604 // Block the platform thread until the engine has removed the view.
605 // TODO(loicsharma): This blocks the platform thread eagerly and can
606 // cause unnecessary delay in input processing. Instead, this should block
607 // lazily only when an operation needs the view.
608 // https://github.com/flutter/flutter/issues/146248
609 captures.latch.Wait();
610
611 if (!captures.removed) {
612 // Removing the view failed. This is unexpected and indicates a bug in the
613 // Windows embedder.
614 FML_LOG(ERROR) << "FlutterEngineRemoveView failed to remove view";
615 return;
616 }
617 }
618
619 {
620 // The engine no longer presents to the view. Remove the view from the
621 // embedder.
622 std::unique_lock write_lock(views_mutex_);
623
624 FML_DCHECK(views_.find(view_id) != views_.end());
625 views_.erase(view_id);
626 }
627 }
flutter::kImplicitViewId
constexpr FlutterViewId kImplicitViewId
Definition: flutter_windows_engine.h:55

References flutter::kImplicitViewId.

## ◆ RequestApplicationQuit()

void flutter::FlutterWindowsEngine::RequestApplicationQuit | ( | HWND | hwnd,
|  | WPARAM | wparam,
|  | LPARAM | lparam,
|  | AppExitType | exit_type
| ) |  |

Definition at line 940 of file flutter_windows_engine.cc.

943 {
944 platform_handler_->RequestAppExit(hwnd, wparam, lparam, exit_type, 0);
945 }

## ◆ Run() [1/2]

bool flutter::FlutterWindowsEngine::Run | ( |  | ) |

Definition at line 239 of file flutter_windows_engine.cc.

239 {
240 return Run("");
241 }
flutter::FlutterWindowsEngine::Run
bool Run()
Definition: flutter_windows_engine.cc:239

Referenced by FlutterDesktopEngineRun().

## ◆ Run() [2/2]

bool flutter::FlutterWindowsEngine::Run | ( | std::string_view | entrypoint | ) |

Definition at line 243 of file flutter_windows_engine.cc.

243 {
244 if (!project_->HasValidPaths()) {
245 FML_LOG(ERROR) << "Missing or unresolvable paths to assets.";
246 return false;
247 }
248 std::string assets_path_string = project_->assets_path().u8string();
249 std::string icu_path_string = project_->icu_path().u8string();
250 if (embedder_api_.RunsAOTCompiledDartCode()) {
251 aot_data_ = project_->LoadAotData(embedder_api_);
252 if (!aot_data_) {
253 FML_LOG(ERROR) << "Unable to start engine without AOT data.";
254 return false;
255 }
256 }
257
258 // FlutterProjectArgs is expecting a full argv, so when processing it for
259 // flags the first item is treated as the executable and ignored. Add a dummy
260 // value so that all provided arguments are used.
261 std::string executable_name = GetExecutableName();
262 std::vector<const char*> argv = {executable_name.c_str()};
263 std::vector<std::string> switches = project_->GetSwitches();
264 std::transform(
265 switches.begin(), switches.end(), std::back_inserter(argv),
266 [](const std::string& arg) -> const char* { return arg.c_str(); });
267
268 const std::vector<std::string>& entrypoint_args =
269 project_->dart_entrypoint_arguments();
270 std::vector<const char*> entrypoint_argv;
271 std::transform(
272 entrypoint_args.begin(), entrypoint_args.end(),
273 std::back_inserter(entrypoint_argv),
274 [](const std::string& arg) -> const char* { return arg.c_str(); });
275
276 // Configure task runners.
277 FlutterTaskRunnerDescription platform_task_runner = {};
278 platform_task_runner.struct_size = sizeof(FlutterTaskRunnerDescription);
279 platform_task_runner.user_data = task_runner_.get();
280 platform_task_runner.runs_task_on_current_thread_callback =
281 [](void* user_data) -> bool {
282 return static_cast<TaskRunner*>(user_data)->RunsTasksOnCurrentThread();
283 };
284 platform_task_runner.post_task_callback = [](FlutterTask task,
285 uint64_t target_time_nanos,
286 void* user_data) -> void {
287 static_cast<TaskRunner*>(user_data)->PostFlutterTask(task,
288 target_time_nanos);
289 };
290 FlutterCustomTaskRunners custom_task_runners = {};
291 custom_task_runners.struct_size = sizeof(FlutterCustomTaskRunners);
292 custom_task_runners.platform_task_runner = &platform_task_runner;
293 custom_task_runners.thread_priority_setter =
294 &WindowsPlatformThreadPrioritySetter;
295
296 FlutterProjectArgs args = {};
297 args.struct_size = sizeof(FlutterProjectArgs);
298 args.shutdown_dart_vm_when_done = true;
299 args.assets_path = assets_path_string.c_str();
300 args.icu_data_path = icu_path_string.c_str();
301 args.command_line_argc = static_cast<int>(argv.size());
302 args.command_line_argv = argv.empty() ? nullptr : argv.data();
303
304 // Fail if conflicting non-default entrypoints are specified in the method
305 // argument and the project.
306 //
307 // TODO(cbracken): https://github.com/flutter/flutter/issues/109285
308 // The entrypoint method parameter should eventually be removed from this
309 // method and only the entrypoint specified in project_ should be used.
310 if (!project_->dart_entrypoint().empty() && !entrypoint.empty() &&
311 project_->dart_entrypoint() != entrypoint) {
312 FML_LOG(ERROR) << "Conflicting entrypoints were specified in "
313 "FlutterDesktopEngineProperties.dart_entrypoint and "
314 "FlutterDesktopEngineRun(engine, entry_point). ";
315 return false;
316 }
317 if (!entrypoint.empty()) {
318 args.custom_dart_entrypoint = entrypoint.data();
319 } else if (!project_->dart_entrypoint().empty()) {
320 args.custom_dart_entrypoint = project_->dart_entrypoint().c_str();
321 }
322 args.dart_entrypoint_argc = static_cast<int>(entrypoint_argv.size());
323 args.dart_entrypoint_argv =
324 entrypoint_argv.empty() ? nullptr : entrypoint_argv.data();
325 args.platform_message_callback =
326 [](const FlutterPlatformMessage* engine_message,
327 void* user_data) -> void {
328 auto host = static_cast<FlutterWindowsEngine*>(user_data);
329 return host->HandlePlatformMessage(engine_message);
330 };
331 args.vsync_callback = [](void* user_data, intptr_t baton) -> void {
332 auto host = static_cast<FlutterWindowsEngine*>(user_data);
333 host->OnVsync(baton);
334 };
335 args.on_pre_engine_restart_callback = [](void* user_data) {
336 auto host = static_cast<FlutterWindowsEngine*>(user_data);
337 host->OnPreEngineRestart();
338 };
339 args.update_semantics_callback2 = [](const FlutterSemanticsUpdate2* update,
340 void* user_data) {
341 auto host = static_cast<FlutterWindowsEngine*>(user_data);
342
343 // TODO(loicsharma): Remove implicit view assumption.
344 // https://github.com/flutter/flutter/issues/142845
345 auto view = host->view(kImplicitViewId);
346 if (!view) {
347 return;
348 }
349
350 auto accessibility_bridge = view->accessibility_bridge().lock();
351 if (!accessibility_bridge) {
352 return;
353 }
354
355 for (size_t i = 0; i < update->node_count; i++) {
356 const FlutterSemanticsNode2* node = update->nodes[i];
357 accessibility_bridge->AddFlutterSemanticsNodeUpdate(*node);
358 }
359
360 for (size_t i = 0; i < update->custom_action_count; i++) {
361 const FlutterSemanticsCustomAction2* action = update->custom_actions[i];
362 accessibility_bridge->AddFlutterSemanticsCustomActionUpdate(*action);
363 }
364
365 accessibility_bridge->CommitUpdates();
366 };
367 args.root_isolate_create_callback = [](void* user_data) {
368 auto host = static_cast<FlutterWindowsEngine*>(user_data);
369 if (host->root_isolate_create_callback_) {
370 host->root_isolate_create_callback_();
371 }
372 };
373 args.channel_update_callback = [](const FlutterChannelUpdate* update,
374 void* user_data) {
375 auto host = static_cast<FlutterWindowsEngine*>(user_data);
376 if (SAFE_ACCESS(update, channel, nullptr) != nullptr) {
377 std::string channel_name(update->channel);
378 host->OnChannelUpdate(std::move(channel_name),
379 SAFE_ACCESS(update, listening, false));
380 }
381 };
382
383 args.custom_task_runners = &custom_task_runners;
384
385 if (!platform_view_plugin_) {
386 platform_view_plugin_ = std::make_unique<PlatformViewPlugin>(
387 messenger_wrapper_.get(), task_runner_.get());
388 }
389 if (egl_manager_) {
390 auto resolver = [](const char* name) -> void* {
391 return reinterpret_cast<void*>(::eglGetProcAddress(name));
392 };
393
394 // TODO(schectman) Pass the platform view manager to the compositor
395 // constructors: https://github.com/flutter/flutter/issues/143375
396 compositor_ =
397 std::make_unique<CompositorOpenGL>(this, resolver, enable_impeller_);
398 } else {
399 compositor_ = std::make_unique<CompositorSoftware>();
400 }
401
402 FlutterCompositor compositor = {};
403 compositor.struct_size = sizeof(FlutterCompositor);
404 compositor.user_data = this;
405 compositor.create_backing_store_callback =
406 [](const FlutterBackingStoreConfig* config,
407 FlutterBackingStore* backing_store_out, void* user_data) -> bool {
408 auto host = static_cast<FlutterWindowsEngine*>(user_data);
409
410 return host->compositor_->CreateBackingStore(*config, backing_store_out);
411 };
412
413 compositor.collect_backing_store_callback =
414 [](const FlutterBackingStore* backing_store, void* user_data) -> bool {
415 auto host = static_cast<FlutterWindowsEngine*>(user_data);
416
417 return host->compositor_->CollectBackingStore(backing_store);
418 };
419
420 compositor.present_view_callback =
421 [](const FlutterPresentViewInfo* info) -> bool {
422 auto host = static_cast<FlutterWindowsEngine*>(info->user_data);
423
424 return host->Present(info);
425 };
426 args.compositor = &compositor;
427
428 if (aot_data_) {
429 args.aot_data = aot_data_.get();
430 }
431
432 // The platform thread creates OpenGL contexts. These
433 // must be released to be used by the engine's threads.
434 FML_DCHECK(!egl_manager_ || !egl_manager_->HasContextCurrent());
435
436 FlutterRendererConfig renderer_config;
437
438 if (enable_impeller_) {
439 // Impeller does not support a Software backend. Avoid falling back and
440 // confusing the engine on which renderer is selected.
441 if (!egl_manager_) {
442 FML_LOG(ERROR) << "Could not create surface manager. Impeller backend "
443 "does not support software rendering.";
444 return false;
445 }
446 renderer_config = GetOpenGLRendererConfig();
447 } else {
448 renderer_config =
449 egl_manager_ ? GetOpenGLRendererConfig() : GetSoftwareRendererConfig();
450 }
451
452 auto result = embedder_api_.Run(FLUTTER_ENGINE_VERSION, &renderer_config,
453 &args, this, &engine_);
454 if (result != kSuccess || engine_ == nullptr) {
455 FML_LOG(ERROR) << "Failed to start Flutter engine: error " << result;
456 return false;
457 }
458
459 // Configure device frame rate displayed via devtools.
460 FlutterEngineDisplay display = {};
461 display.struct_size = sizeof(FlutterEngineDisplay);
462 display.display_id = 0;
463 display.single_display = true;
464 display.refresh_rate =
465 1.0 / (static_cast<double>(FrameInterval().count()) / 1000000000.0);
466
467 std::vector<FlutterEngineDisplay> displays = {display};
468 embedder_api_.NotifyDisplayUpdate(engine_,
469 kFlutterEngineDisplaysUpdateTypeStartup,
470 displays.data(), displays.size());
471
472 SendSystemLocales();
473 SetLifecycleState(flutter::AppLifecycleState::kResumed);
474
475 settings_plugin_->StartWatching();
476 settings_plugin_->SendSettings();
477
478 InitializeKeyboard();
479
480 return true;
481 }
flutter::FlutterWindowsEngine::GetExecutableName
std::string GetExecutableName() const
Definition: flutter_windows_engine.cc:903
flutter::FlutterWindowsView::accessibility_bridge
std::weak_ptr< AccessibilityBridgeWindows > accessibility_bridge()
Definition: flutter_windows_view.h:242
flutter::AppLifecycleState::kResumed
@ kResumed
flutter::WindowsPlatformThreadPrioritySetter
static void WindowsPlatformThreadPrioritySetter(FlutterThreadPriority priority)
Definition: flutter_windows_engine.h:60

References flutter::FlutterWindowsView::accessibility_bridge(), action, HandlePlatformMessage(), flutter::kImplicitViewId, OnPreEngineRestart(), OnVsync(), user_data, view(), and flutter::WindowsPlatformThreadPrioritySetter().

## ◆ running()

virtual bool flutter::FlutterWindowsEngine::running | ( |  | ) | const
| inlinevirtual

Definition at line 117 of file flutter_windows_engine.h.

117 { return engine_ != nullptr; }

Referenced by FlutterDesktopEngineDestroy().

## ◆ ScheduleFrame()

void flutter::FlutterWindowsEngine::ScheduleFrame | ( |  | ) |

Definition at line 759 of file flutter_windows_engine.cc.

759 {
760 embedder_api_.ScheduleFrame(engine_);
761 }

Referenced by flutter::FlutterWindowsView::ForceRedraw().

## ◆ semantics_enabled()

bool flutter::FlutterWindowsEngine::semantics_enabled | ( |  | ) | const
| inline

Definition at line 239 of file flutter_windows_engine.h.

239 { return semantics_enabled_; }

Referenced by flutter::AccessibilityPlugin::Announce().

## ◆ SendKeyEvent()

void flutter::FlutterWindowsEngine::SendKeyEvent | ( | const FlutterKeyEvent & | event,
|  | FlutterKeyEventCallback | callback,
|  | void * | user_data
| ) |  |

Definition at line 692 of file flutter_windows_engine.cc.

694 {
695 if (engine_) {
696 embedder_api_.SendKeyEvent(engine_, &event, callback, user_data);
697 }
698 }

## ◆ SendPlatformMessage()

bool flutter::FlutterWindowsEngine::SendPlatformMessage | ( | const char * | channel,
|  | const uint8_t * | message,
|  | const size_t | message_size,
|  | const FlutterDesktopBinaryReply | reply,
|  | void * | user_data
| ) |  |

Definition at line 700 of file flutter_windows_engine.cc.

705 {
706 FlutterPlatformMessageResponseHandle* response_handle = nullptr;
707 if (reply != nullptr && user_data != nullptr) {
708 FlutterEngineResult result =
709 embedder_api_.PlatformMessageCreateResponseHandle(
710 engine_, reply, user_data, &response_handle);
711 if (result != kSuccess) {
712 FML_LOG(ERROR) << "Failed to create response handle";
713 return false;
714 }
715 }
716
717 FlutterPlatformMessage platform_message = {
718 sizeof(FlutterPlatformMessage),
719 channel,
720 message,
721 message_size,
722 response_handle,
723 };
724
725 FlutterEngineResult message_result =
726 embedder_api_.SendPlatformMessage(engine_, &platform_message);
727 if (response_handle != nullptr) {
728 embedder_api_.PlatformMessageReleaseResponseHandle(engine_,
729 response_handle);
730 }
731 return message_result == kSuccess;
732 }

References user_data.

Referenced by FlutterDesktopMessengerSendWithReply().

## ◆ SendPlatformMessageResponse()

void flutter::FlutterWindowsEngine::SendPlatformMessageResponse | ( | const FlutterDesktopMessageResponseHandle * | handle,
|  | const uint8_t * | data,
|  | size_t | data_length
| ) |  |

Definition at line 734 of file flutter_windows_engine.cc.

737 {
738 embedder_api_.SendPlatformMessageResponse(engine_, handle, data, data_length);
739 }

Referenced by FlutterDesktopMessengerSendResponse().

## ◆ SendPointerEvent()

void flutter::FlutterWindowsEngine::SendPointerEvent | ( | const FlutterPointerEvent & | event | ) |

Definition at line 686 of file flutter_windows_engine.cc.

686 {
687 if (engine_) {
688 embedder_api_.SendPointerEvent(engine_, &event, 1);
689 }
690 }

## ◆ SendWindowMetricsEvent()

void flutter::FlutterWindowsEngine::SendWindowMetricsEvent | ( | const FlutterWindowMetricsEvent & | event | ) |

Definition at line 679 of file flutter_windows_engine.cc.

680 {
681 if (engine_) {
682 embedder_api_.SendWindowMetricsEvent(engine_, &event);
683 }
684 }

Referenced by flutter::FlutterWindowsView::SendInitialBounds().

## ◆ SetNextFrameCallback()

void flutter::FlutterWindowsEngine::SetNextFrameCallback | ( | fml::closure | callback | ) |

Definition at line 763 of file flutter_windows_engine.cc.

763 {
764 next_frame_callback_ = std::move(callback);
765
766 embedder_api_.SetNextFrameCallback(
767 engine_,
768 [](void* user_data) {
769 // Embedder callback runs on raster thread. Switch back to platform
770 // thread.
771 FlutterWindowsEngine* self =
772 static_cast<FlutterWindowsEngine*>(user_data);
773
774 self->task_runner_->PostTask(std::move(self->next_frame_callback_));
775 },
776 this);
777 }

Referenced by FlutterDesktopEngineSetNextFrameCallback().

## ◆ SetRootIsolateCreateCallback()

void flutter::FlutterWindowsEngine::SetRootIsolateCreateCallback | ( | const fml::closure & | callback | ) |
| inline

Definition at line 259 of file flutter_windows_engine.h.

259 {
260 root_isolate_create_callback_ = callback;
261 }

References callback.

## ◆ SetSwitches()

void flutter::FlutterWindowsEngine::SetSwitches | ( | const std::vector< std::string > & | switches | ) |

Definition at line 234 of file flutter_windows_engine.cc.

235 {
236 project_->SetSwitches(switches);
237 }

## ◆ Stop()

bool flutter::FlutterWindowsEngine::Stop | ( |  | ) |
| virtual

Definition at line 483 of file flutter_windows_engine.cc.

483 {
484 if (engine_) {
485 for (const auto& [callback, registrar] :
486 plugin_registrar_destruction_callbacks_) {
487 callback(registrar);
488 }
489 FlutterEngineResult result = embedder_api_.Shutdown(engine_);
490 engine_ = nullptr;
491 return (result == kSuccess);
492 }
493 return false;
494 }

Referenced by FlutterDesktopEngineDestroy().

## ◆ task_runner()

TaskRunner* flutter::FlutterWindowsEngine::task_runner | ( |  | ) |
| inline

Definition at line 155 of file flutter_windows_engine.h.

155 { return task_runner_.get(); }

Referenced by flutter::FlutterWindowsTextureRegistrar::MarkTextureFrameAvailable(), and flutter::FlutterWindowsTextureRegistrar::UnregisterTexture().

## ◆ text_input_plugin()

TextInputPlugin* flutter::FlutterWindowsEngine::text_input_plugin | ( |  | ) |
| inline

Definition at line 185 of file flutter_windows_engine.h.

185 { return text_input_plugin_.get(); }

## ◆ texture_registrar()

FlutterWindowsTextureRegistrar* flutter::FlutterWindowsEngine::texture_registrar | ( |  | ) |
| inline

Definition at line 159 of file flutter_windows_engine.h.

159 {
160 return texture_registrar_.get();
161 }

Referenced by FlutterDesktopRegistrarGetTextureRegistrar().

## ◆ UnregisterExternalTexture()

bool flutter::FlutterWindowsEngine::UnregisterExternalTexture | ( | int64_t | texture_id | ) |

Definition at line 846 of file flutter_windows_engine.cc.

846 {
847 return (embedder_api_.UnregisterExternalTexture(engine_, texture_id) ==
848 kSuccess);
849 }

## ◆ UpdateAccessibilityFeatures()

void flutter::FlutterWindowsEngine::UpdateAccessibilityFeatures | ( |  | ) |

Definition at line 917 of file flutter_windows_engine.cc.

917 {
918 UpdateHighContrastMode();
919 }
flutter::FlutterWindowsEngine::UpdateHighContrastMode
void UpdateHighContrastMode()
Definition: flutter_windows_engine.cc:921

Referenced by flutter::testing::TEST_F().

## ◆ UpdateHighContrastMode()

void flutter::FlutterWindowsEngine::UpdateHighContrastMode | ( |  | ) |

Definition at line 921 of file flutter_windows_engine.cc.

921 {
922 high_contrast_enabled_ = windows_proc_table_->GetHighContrastEnabled();
923
924 SendAccessibilityFeatures();
925 settings_plugin_->UpdateHighContrastMode(high_contrast_enabled_);
926 }

Referenced by flutter::FlutterWindowsView::OnHighContrastChanged().

## ◆ UpdateSemanticsEnabled()

void flutter::FlutterWindowsEngine::UpdateSemanticsEnabled | ( | bool | enabled | ) |

Definition at line 886 of file flutter_windows_engine.cc.

886 {
887 if (engine_ && semantics_enabled_ != enabled) {
888 std::shared_lock read_lock(views_mutex_);
889
890 semantics_enabled_ = enabled;
891 embedder_api_.UpdateSemanticsEnabled(engine_, enabled);
892 for (auto iterator = views_.begin(); iterator != views_.end(); iterator++) {
893 iterator->second->UpdateSemanticsEnabled(enabled);
894 }
895 }
896 }

Referenced by flutter::FlutterWindowsView::OnUpdateSemanticsEnabled(), and flutter::testing::TEST_F().

## ◆ view()

FlutterWindowsView * flutter::FlutterWindowsEngine::view | ( | FlutterViewId | view_id | ) | const

Definition at line 657 of file flutter_windows_engine.cc.

657 {
658 std::shared_lock read_lock(views_mutex_);
659
660 auto iterator = views_.find(view_id);
661 if (iterator == views_.end()) {
662 return nullptr;
663 }
664
665 return iterator->second;
666 }

Referenced by flutter::AccessibilityPlugin::Announce(), FlutterDesktopPluginRegistrarGetView(), FlutterDesktopPluginRegistrarGetViewById(), flutter::PlatformHandler::GetHasStrings(), flutter::PlatformHandler::GetPlainText(), Run(), and flutter::PlatformHandler::SetPlainText().

## ◆ window_proc_delegate_manager()

WindowProcDelegateManager* flutter::FlutterWindowsEngine::window_proc_delegate_manager | ( |  | ) |
| inline

Definition at line 167 of file flutter_windows_engine.h.

167 {
168 return window_proc_delegate_manager_.get();
169 }

Referenced by FlutterDesktopPluginRegistrarRegisterTopLevelWindowProcDelegate(), and FlutterDesktopPluginRegistrarUnregisterTopLevelWindowProcDelegate().

## ◆ windows_proc_table()

std::shared_ptr<WindowsProcTable> flutter::FlutterWindowsEngine::windows_proc_table | ( |  | ) |
| inline

Definition at line 297 of file flutter_windows_engine.h.

297 {
298 return windows_proc_table_;
299 }

Referenced by CreateViewController().

## Friends And Related Function Documentation

## ◆ EngineModifier

friend class EngineModifier
| friend

Definition at line 330 of file flutter_windows_engine.h.

The documentation for this class was generated from the following files:

- shell/platform/windows/flutter_windows_engine.h
- shell/platform/windows/flutter_windows_engine.cc