| Flutter Windows Embedder |

flutter_windows_engine.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
5 #include "flutter/shell/platform/windows/flutter_windows_engine.h"
6
7 #include <dwmapi.h>
8
9 #include <filesystem>
10 #include <shared_mutex>
11 #include <sstream>
12
13 #include "flutter/fml/logging.h"
14 #include "flutter/fml/paths.h"
15 #include "flutter/fml/platform/win/wstring_conversion.h"
16 #include "flutter/fml/synchronization/waitable_event.h"
17 #include "flutter/shell/platform/common/client_wrapper/binary_messenger_impl.h"
18 #include "flutter/shell/platform/common/client_wrapper/include/flutter/standard_message_codec.h"
19 #include "flutter/shell/platform/common/path_utils.h"
20 #include "flutter/shell/platform/embedder/embedder_struct_macros.h"
21 #include "flutter/shell/platform/windows/accessibility_bridge_windows.h"
22 #include "flutter/shell/platform/windows/compositor_opengl.h"
23 #include "flutter/shell/platform/windows/compositor_software.h"
24 #include "flutter/shell/platform/windows/display_monitor.h"
25 #include "flutter/shell/platform/windows/flutter_windows_view.h"
26 #include "flutter/shell/platform/windows/keyboard_key_channel_handler.h"
27 #include "flutter/shell/platform/windows/system_utils.h"
28 #include "flutter/shell/platform/windows/task_runner.h"
29 #include "flutter/shell/platform/windows/window_manager.h"
30 #include "flutter/third_party/accessibility/ax/ax_node.h"
31 #include "shell/platform/windows/flutter_project_bundle.h"
32
33 // winbase.h defines GetCurrentTime as a macro.
34 #undef GetCurrentTime
35
36 static constexpr char kAccessibilityChannelName[] = "flutter/accessibility";
37
38 namespace flutter {
39
40 namespace {
41
42 // Lifted from vsync_waiter_fallback.cc
43 static std::chrono::nanoseconds SnapToNextTick(
44 std::chrono::nanoseconds value,
45 std::chrono::nanoseconds tick_phase,
46 std::chrono::nanoseconds tick_interval) {
47 std::chrono::nanoseconds offset = (tick_phase - value) % tick_interval;
48 if (offset != std::chrono::nanoseconds::zero())
49 offset = offset + tick_interval;
50 return value + offset;
51 }
52
53 // Creates and returns a FlutterRendererConfig that renders to the view (if any)
54 // of a FlutterWindowsEngine, using OpenGL (via ANGLE).
55 // The user_data received by the render callbacks refers to the
56 // FlutterWindowsEngine.
57 FlutterRendererConfig GetOpenGLRendererConfig() {
58 FlutterRendererConfig config = {};
59 config.type = kOpenGL;
60 config.open_gl.struct_size = sizeof(config.open_gl);
61 config.open_gl.make_current = [](void* user_data) -> bool {
62 auto host = static_cast<FlutterWindowsEngine*>(user_data);
63 if (!host->egl_manager()) {
64 return false;
65 }
66 return host->egl_manager()->render_context()->MakeCurrent();
67 };
68 config.open_gl.clear_current = [](void* user_data) -> bool {
69 auto host = static_cast<FlutterWindowsEngine*>(user_data);
70 if (!host->egl_manager()) {
71 return false;
72 }
73 return host->egl_manager()->render_context()->ClearCurrent();
74 };
75 config.open_gl.present = [](void* user_data) -> bool { FML_UNREACHABLE(); };
76 config.open_gl.fbo_reset_after_present = true;
77 config.open_gl.fbo_with_frame_info_callback =
78 [](void* user_data, const FlutterFrameInfo* info) -> uint32_t {
79 FML_UNREACHABLE();
80 };
81 config.open_gl.gl_proc_resolver = [](void* user_data,
82 const char* what) -> void* {
83 return reinterpret_cast<void*>(eglGetProcAddress(what));
84 };
85 config.open_gl.make_resource_current = [](void* user_data) -> bool {
86 auto host = static_cast<FlutterWindowsEngine*>(user_data);
87 if (!host->egl_manager()) {
88 return false;
89 }
90 return host->egl_manager()->resource_context()->MakeCurrent();
91 };
92 config.open_gl.gl_external_texture_frame_callback =
93 [](void* user_data, int64_t texture_id, size_t width, size_t height,
94 FlutterOpenGLTexture* texture) -> bool {
95 auto host = static_cast<FlutterWindowsEngine*>(user_data);
96 if (!host->texture_registrar()) {
97 return false;
98 }
99 return host->texture_registrar()->PopulateTexture(texture_id, width, height,
100 texture);
101 };
102 return config;
103 }
104
105 // Creates and returns a FlutterRendererConfig that renders to the view (if any)
106 // of a FlutterWindowsEngine, using software rasterization.
107 // The user_data received by the render callbacks refers to the
108 // FlutterWindowsEngine.
109 FlutterRendererConfig GetSoftwareRendererConfig() {
110 FlutterRendererConfig config = {};
111 config.type = kSoftware;
112 config.software.struct_size = sizeof(config.software);
113 config.software.surface_present_callback =
114 [](void* user_data, const void* allocation, size_t row_bytes,
115 size_t height) {
116 FML_UNREACHABLE();
117 return false;
118 };
119 return config;
120 }
121
122 // Converts a FlutterPlatformMessage to an equivalent FlutterDesktopMessage.
123 static FlutterDesktopMessage ConvertToDesktopMessage(
124 const FlutterPlatformMessage& engine_message) {
125 FlutterDesktopMessage message = {};
126 message.struct_size = sizeof(message);
127 message.channel = engine_message.channel;
128 message.message = engine_message.message;
129 message.message_size = engine_message.message_size;
130 message.response_handle = engine_message.response_handle;
131 return message;
132 }
133
134 // Converts a LanguageInfo struct to a FlutterLocale struct. |info| must outlive
135 // the returned value, since the returned FlutterLocale has pointers into it.
136 FlutterLocale CovertToFlutterLocale(const LanguageInfo& info) {
137 FlutterLocale locale = {};
138 locale.struct_size = sizeof(FlutterLocale);
139 locale.language_code = info.language.c_str();
140 if (!info.region.empty()) {
141 locale.country_code = info.region.c_str();
142 }
143 if (!info.script.empty()) {
144 locale.script_code = info.script.c_str();
145 }
146 return locale;
147 }
148
149 } // namespace
150
151 FlutterWindowsEngine::FlutterWindowsEngine(
152 const FlutterProjectBundle& project,
153 std::shared_ptr<WindowsProcTable> windows_proc_table)
154 : project_(std::make_unique<FlutterProjectBundle>(project)),
155 windows_proc_table_(std::move(windows_proc_table)),
156 aot_data_(nullptr, nullptr),
157 lifecycle_manager_(std::make_unique<WindowsLifecycleManager>(this)) {
158 if (windows_proc_table_ == nullptr) {
159 windows_proc_table_ = std::make_shared<WindowsProcTable>();
160 }
161
162 gl_ = egl::ProcTable::Create();
163
164 embedder_api_.struct_size = sizeof(FlutterEngineProcTable);
165 FlutterEngineGetProcAddresses(&embedder_api_);
166
167 task_runner_ =
168 std::make_unique<TaskRunner>(
169 embedder_api_.GetCurrentTime, [this](const auto* task) {
170 if (!engine_) {
171 FML_LOG(ERROR)
172 << "Cannot post an engine task when engine is not running.";
173 return;
174 }
175 if (embedder_api_.RunTask(engine_, task) != kSuccess) {
176 FML_LOG(ERROR) << "Failed to post an engine task.";
177 }
178 });
179
180 // Set up the legacy structs backing the API handles.
181 messenger_ =
182 fml::RefPtr<FlutterDesktopMessenger>(new FlutterDesktopMessenger());
183 messenger_->SetEngine(this);
184 plugin_registrar_ = std::make_unique<FlutterDesktopPluginRegistrar>();
185 plugin_registrar_->engine = this;
186
187 messenger_wrapper_ =
188 std::make_unique<BinaryMessengerImpl>(messenger_->ToRef());
189 message_dispatcher_ =
190 std::make_unique<IncomingMessageDispatcher>(messenger_->ToRef());
191
192 texture_registrar_ =
193 std::make_unique<FlutterWindowsTextureRegistrar>(this, gl_);
194
195 // Check for impeller support.
196 auto& switches = project_->GetSwitches();
197 enable_impeller_ = std::find(switches.begin(), switches.end(),
198 "--enable-impeller=true") != switches.end();
199
200 egl_manager_ = egl::Manager::Create(
201 static_cast<egl::GpuPreference>(project_->gpu_preference()));
202 window_proc_delegate_manager_ = std::make_unique<WindowProcDelegateManager>();
203
204 display_monitor_ = std::make_shared<DisplayMonitor>(this);
205
206 window_proc_delegate_manager_->RegisterTopLevelWindowProcDelegate(
207 [](HWND hwnd, UINT msg, WPARAM wpar, LPARAM lpar, void* user_data,
208 LRESULT* result) {
209 BASE_DCHECK(user_data);
210 FlutterWindowsEngine* that =
211 static_cast<FlutterWindowsEngine*>(user_data);
212
213 BASE_DCHECK(that->display_monitor_);
214 if (that->display_monitor_->HandleWindowMessage(hwnd, msg, wpar, lpar,
215 result)) {
216 return true;
217 }
218
219 BASE_DCHECK(that->lifecycle_manager_);
220 bool handled =
221 that->lifecycle_manager_->WindowProc(hwnd, msg, wpar, lpar, result);
222 if (handled) {
223 return true;
224 }
225 auto message_result =
226 that->window_manager_->HandleMessage(hwnd, msg, wpar, lpar);
227 if (message_result) {
228 *result = *message_result;
229 return true;
230 }
231 return false;
232 },
233 static_cast<void*>(this));
234
235 // Set up internal channels.
236 // TODO: Replace this with an embedder.h API. See
237 // https://github.com/flutter/flutter/issues/71099
238 internal_plugin_registrar_ =
239 std::make_unique<PluginRegistrar>(plugin_registrar_.get());
240
241 accessibility_plugin_ = std::make_unique<AccessibilityPlugin>(this);
242 AccessibilityPlugin::SetUp(messenger_wrapper_.get(),
243 accessibility_plugin_.get());
244
245 cursor_handler_ =
246 std::make_unique<CursorHandler>(messenger_wrapper_.get(), this);
247 platform_handler_ =
248 std::make_unique<PlatformHandler>(messenger_wrapper_.get(), this);
249 window_manager_ = std::make_unique<WindowManager>(this);
250 settings_plugin_ = std::make_unique<SettingsPlugin>(messenger_wrapper_.get(),
251 task_runner_.get());
252 }
253
254 FlutterWindowsEngine::~FlutterWindowsEngine() {
255 messenger_->SetEngine(nullptr);
256 Stop();
257 }
258
259 FlutterWindowsEngine* FlutterWindowsEngine::GetEngineForId(int64_t engine_id) {
260 return reinterpret_cast<FlutterWindowsEngine*>(engine_id);
261 }
262
263 void FlutterWindowsEngine::SetSwitches(
264 const std::vector<std::string>& switches) {
265 project_->SetSwitches(switches);
266 }
267
268 bool FlutterWindowsEngine::Run() {
269 return Run("");
270 }
271
272 bool FlutterWindowsEngine::Run(std::string_view entrypoint) {
273 if (!project_->HasValidPaths()) {
274 FML_LOG(ERROR) << "Missing or unresolvable paths to assets.";
275 return false;
276 }
277 std::string assets_path_string = project_->assets_path().string();
278 std::string icu_path_string = project_->icu_path().string();
279 if (embedder_api_.RunsAOTCompiledDartCode()) {
280 aot_data_ = project_->LoadAotData(embedder_api_);
281 if (!aot_data_) {
282 FML_LOG(ERROR) << "Unable to start engine without AOT data.";
283 return false;
284 }
285 }
286
287 // FlutterProjectArgs is expecting a full argv, so when processing it for
288 // flags the first item is treated as the executable and ignored. Add a dummy
289 // value so that all provided arguments are used.
290 std::string executable_name = GetExecutableName();
291 std::vector<const char*> argv = {executable_name.c_str()};
292 std::vector<std::string> switches = project_->GetSwitches();
293 std::transform(
294 switches.begin(), switches.end(), std::back_inserter(argv),
295 [](const std::string& arg) -> const char* { return arg.c_str(); });
296
297 const std::vector<std::string>& entrypoint_args =
298 project_->dart_entrypoint_arguments();
299 std::vector<const char*> entrypoint_argv;
300 std::transform(
301 entrypoint_args.begin(), entrypoint_args.end(),
302 std::back_inserter(entrypoint_argv),
303 [](const std::string& arg) -> const char* { return arg.c_str(); });
304
305 // Configure task runners.
306 FlutterTaskRunnerDescription platform_task_runner = {};
307 platform_task_runner.struct_size = sizeof(FlutterTaskRunnerDescription);
308 platform_task_runner.user_data = task_runner_.get();
309 platform_task_runner.runs_task_on_current_thread_callback =
310 [](void* user_data) -> bool {
311 return static_cast<TaskRunner*>(user_data)->RunsTasksOnCurrentThread();
312 };
313 platform_task_runner.post_task_callback = [](FlutterTask task,
314 uint64_t target_time_nanos,
315 void* user_data) -> void {
316 static_cast<TaskRunner*>(user_data)->PostFlutterTask(task,
317 target_time_nanos);
318 };
319 FlutterCustomTaskRunners custom_task_runners = {};
320 custom_task_runners.struct_size = sizeof(FlutterCustomTaskRunners);
321 custom_task_runners.platform_task_runner = &platform_task_runner;
322 custom_task_runners.thread_priority_setter =
323 &WindowsPlatformThreadPrioritySetter;
324
325 if (project_->ui_thread_policy() !=
326 FlutterUIThreadPolicy::RunOnSeparateThread) {
327 custom_task_runners.ui_task_runner = &platform_task_runner;
328 } else {
329 FML_LOG(WARNING) << "Running with unmerged platform and UI threads. This "
330 "will be removed in future.";
331 }
332
333 FlutterProjectArgs args = {};
334 args.struct_size = sizeof(FlutterProjectArgs);
335 args.shutdown_dart_vm_when_done = true;
336 args.assets_path = assets_path_string.c_str();
337 args.icu_data_path = icu_path_string.c_str();
338 args.command_line_argc = static_cast<int>(argv.size());
339 args.command_line_argv = argv.empty() ? nullptr : argv.data();
340 args.engine_id = reinterpret_cast<int64_t>(this);
341
342 // Fail if conflicting non-default entrypoints are specified in the method
343 // argument and the project.
344 //
345 // TODO(cbracken): https://github.com/flutter/flutter/issues/109285
346 // The entrypoint method parameter should eventually be removed from this
347 // method and only the entrypoint specified in project_ should be used.
348 if (!project_->dart_entrypoint().empty() && !entrypoint.empty() &&
349 project_->dart_entrypoint() != entrypoint) {
350 FML_LOG(ERROR) << "Conflicting entrypoints were specified in "
351 "FlutterDesktopEngineProperties.dart_entrypoint and "
352 "FlutterDesktopEngineRun(engine, entry_point). ";
353 return false;
354 }
355 if (!entrypoint.empty()) {
356 args.custom_dart_entrypoint = entrypoint.data();
357 } else if (!project_->dart_entrypoint().empty()) {
358 args.custom_dart_entrypoint = project_->dart_entrypoint().c_str();
359 }
360 args.dart_entrypoint_argc = static_cast<int>(entrypoint_argv.size());
361 args.dart_entrypoint_argv =
362 entrypoint_argv.empty() ? nullptr : entrypoint_argv.data();
363 args.platform_message_callback =
364 [](const FlutterPlatformMessage* engine_message,
365 void* user_data) -> void {
366 auto host = static_cast<FlutterWindowsEngine*>(user_data);
367 return host->HandlePlatformMessage(engine_message);
368 };
369 args.vsync_callback = [](void* user_data, intptr_t baton) -> void {
370 auto host = static_cast<FlutterWindowsEngine*>(user_data);
371 host->OnVsync(baton);
372 };
373 args.on_pre_engine_restart_callback = [](void* user_data) {
374 auto host = static_cast<FlutterWindowsEngine*>(user_data);
375 host->OnPreEngineRestart();
376 };
377 args.update_semantics_callback2 = [](const FlutterSemanticsUpdate2* update,
378 void* user_data) {
379 auto host = static_cast<FlutterWindowsEngine*>(user_data);
380
381 auto view = host->view(update->view_id);
382 if (!view) {
383 return;
384 }
385
386 auto accessibility_bridge = view->accessibility_bridge().lock();
387 if (!accessibility_bridge) {
388 return;
389 }
390
391 for (size_t i = 0; i < update->node_count; i++) {
392 const FlutterSemanticsNode2* node = update->nodes[i];
393 accessibility_bridge->AddFlutterSemanticsNodeUpdate(*node);
394 }
395
396 for (size_t i = 0; i < update->custom_action_count; i++) {
397 const FlutterSemanticsCustomAction2* action = update->custom_actions[i];
398 accessibility_bridge->AddFlutterSemanticsCustomActionUpdate(*action);
399 }
400
401 accessibility_bridge->CommitUpdates();
402 };
403 args.root_isolate_create_callback = [](void* user_data) {
404 auto host = static_cast<FlutterWindowsEngine*>(user_data);
405 if (host->root_isolate_create_callback_) {
406 host->root_isolate_create_callback_();
407 }
408 };
409 args.channel_update_callback = [](const FlutterChannelUpdate* update,
410 void* user_data) {
411 auto host = static_cast<FlutterWindowsEngine*>(user_data);
412 if (SAFE_ACCESS(update, channel, nullptr) != nullptr) {
413 std::string channel_name(update->channel);
414 host->OnChannelUpdate(std::move(channel_name),
415 SAFE_ACCESS(update, listening, false));
416 }
417 };
418 args.view_focus_change_request_callback =
419 [](const FlutterViewFocusChangeRequest* request, void* user_data) {
420 auto host = static_cast<FlutterWindowsEngine*>(user_data);
421 host->OnViewFocusChangeRequest(request);
422 };
423
424 args.custom_task_runners = &custom_task_runners;
425
426 if (!platform_view_plugin_) {
427 platform_view_plugin_ = std::make_unique<PlatformViewPlugin>(
428 messenger_wrapper_.get(), task_runner_.get());
429 }
430 if (egl_manager_) {
431 auto resolver = [](const char* name) -> void* {
432 return reinterpret_cast<void*>(::eglGetProcAddress(name));
433 };
434
435 // TODO(schectman) Pass the platform view manager to the compositor
436 // constructors: https://github.com/flutter/flutter/issues/143375
437 compositor_ =
438 std::make_unique<CompositorOpenGL>(this, resolver, enable_impeller_);
439 } else {
440 compositor_ = std::make_unique<CompositorSoftware>();
441 }
442
443 FlutterCompositor compositor = {};
444 compositor.struct_size = sizeof(FlutterCompositor);
445 compositor.user_data = this;
446 compositor.create_backing_store_callback =
447 [](const FlutterBackingStoreConfig* config,
448 FlutterBackingStore* backing_store_out, void* user_data) -> bool {
449 auto host = static_cast<FlutterWindowsEngine*>(user_data);
450
451 return host->compositor_->CreateBackingStore(*config, backing_store_out);
452 };
453
454 compositor.collect_backing_store_callback =
455 [](const FlutterBackingStore* backing_store, void* user_data) -> bool {
456 auto host = static_cast<FlutterWindowsEngine*>(user_data);
457
458 return host->compositor_->CollectBackingStore(backing_store);
459 };
460
461 compositor.present_view_callback =
462 [](const FlutterPresentViewInfo* info) -> bool {
463 auto host = static_cast<FlutterWindowsEngine*>(info->user_data);
464
465 return host->Present(info);
466 };
467 args.compositor = &compositor;
468
469 if (aot_data_) {
470 args.aot_data = aot_data_.get();
471 }
472
473 // The platform thread creates OpenGL contexts. These
474 // must be released to be used by the engine's threads.
475 FML_DCHECK(!egl_manager_ || !egl_manager_->HasContextCurrent());
476
477 FlutterRendererConfig renderer_config;
478
479 if (enable_impeller_) {
480 // Impeller does not support a Software backend. Avoid falling back and
481 // confusing the engine on which renderer is selected.
482 if (!egl_manager_) {
483 FML_LOG(ERROR) << "Could not create surface manager. Impeller backend "
484 "does not support software rendering.";
485 return false;
486 }
487 renderer_config = GetOpenGLRendererConfig();
488 } else {
489 renderer_config =
490 egl_manager_ ? GetOpenGLRendererConfig() : GetSoftwareRendererConfig();
491 }
492
493 auto result = embedder_api_.Run(FLUTTER_ENGINE_VERSION, &renderer_config,
494 &args, this, &engine_);
495 if (result != kSuccess || engine_ == nullptr) {
496 FML_LOG(ERROR) << "Failed to start Flutter engine: error " << result;
497 return false;
498 }
499
500 display_monitor_->UpdateDisplays();
501
502 SendSystemLocales();
503
504 settings_plugin_->StartWatching();
505 settings_plugin_->SendSettings();
506
507 InitializeKeyboard();
508
509 return true;
510 }
511
512 bool FlutterWindowsEngine::Stop() {
513 if (engine_) {
514 window_manager_->OnEngineShutdown();
515 for (const auto& [callback, registrar] :
516 plugin_registrar_destruction_callbacks_) {
517 callback(registrar);
518 }
519 FlutterEngineResult result = embedder_api_.Shutdown(engine_);
520 engine_ = nullptr;
521 return (result == kSuccess);
522 }
523 return false;
524 }
525
526 std::unique_ptr<FlutterWindowsView> FlutterWindowsEngine::CreateView(
527 std::unique_ptr<WindowBindingHandler> window) {
528 auto view_id = next_view_id_;
529 auto view = std::make_unique<FlutterWindowsView>(
530 view_id, this, std::move(window), windows_proc_table_);
531
532 view->CreateRenderSurface();
533 view->UpdateSemanticsEnabled(semantics_enabled_);
534
535 next_view_id_++;
536
537 {
538 // Add the view to the embedder. This must happen before the engine
539 // is notified the view exists and starts presenting to it.
540 std::unique_lock write_lock(views_mutex_);
541 FML_DCHECK(views_.find(view_id) == views_.end());
542 views_[view_id] = view.get();
543 }
544
545 if (!view->IsImplicitView()) {
546 FML_DCHECK(running());
547
548 struct Captures {
549 fml::AutoResetWaitableEvent latch;
550 bool added;
551 };
552 Captures captures = {};
553
554 FlutterWindowMetricsEvent metrics = view->CreateWindowMetricsEvent();
555
556 FlutterAddViewInfo info = {};
557 info.struct_size = sizeof(FlutterAddViewInfo);
558 info.view_id = view_id;
559 info.view_metrics = &metrics;
560 info.user_data = &captures;
561 info.add_view_callback = [](const FlutterAddViewResult* result) {
562 Captures* captures = reinterpret_cast<Captures*>(result->user_data);
563 captures->added = result->added;
564 captures->latch.Signal();
565 };
566
567 FlutterEngineResult result = embedder_api_.AddView(engine_, &info);
568 if (result != kSuccess) {
569 FML_LOG(ERROR)
570 << "Starting the add view operation failed. FlutterEngineAddView "
571 "returned an unexpected result: "
572 << result << ". This indicates a bug in the Windows embedder.";
573 FML_DCHECK(false);
574 return nullptr;
575 }
576
577 // Block the platform thread until the engine has added the view.
578 // TODO(loicsharma): This blocks the platform thread eagerly and can
579 // cause unnecessary delay in input processing. Instead, this should block
580 // lazily only when the app does an operation which needs the view.
581 // https://github.com/flutter/flutter/issues/146248
582 captures.latch.Wait();
583
584 if (!captures.added) {
585 // Adding the view failed. Update the embedder's state to match the
586 // engine's state. This is unexpected and indicates a bug in the Windows
587 // embedder.
588 FML_LOG(ERROR) << "FlutterEngineAddView failed to add view";
589 std::unique_lock write_lock(views_mutex_);
590 views_.erase(view_id);
591 return nullptr;
592 }
593 }
594
595 return std::move(view);
596 }
597
598 void FlutterWindowsEngine::RemoveView(FlutterViewId view_id) {
599 FML_DCHECK(running());
600
601 // Notify the engine to stop rendering to the view if it isn't the implicit
602 // view. The engine and framework assume the implicit view always exists and
603 // can continue presenting.
604 if (view_id != kImplicitViewId) {
605 struct Captures {
606 fml::AutoResetWaitableEvent latch;
607 bool removed;
608 };
609 Captures captures = {};
610
611 FlutterRemoveViewInfo info = {};
612 info.struct_size = sizeof(FlutterRemoveViewInfo);
613 info.view_id = view_id;
614 info.user_data = &captures;
615 info.remove_view_callback = [](const FlutterRemoveViewResult* result) {
616 // This is invoked on an engine thread. If
617 // |FlutterRemoveViewResult.removed| is `true`, the engine guarantees the
618 // view won't be presented.
619 Captures* captures = reinterpret_cast<Captures*>(result->user_data);
620 captures->removed = result->removed;
621 captures->latch.Signal();
622 };
623
624 FlutterEngineResult result = embedder_api_.RemoveView(engine_, &info);
625 if (result != kSuccess) {
626 FML_LOG(ERROR) << "Starting the remove view operation failed. "
627 "FlutterEngineRemoveView "
628 "returned an unexpected result: "
629 << result
630 << ". This indicates a bug in the Windows embedder.";
631 FML_DCHECK(false);
632 return;
633 }
634
635 // Block the platform thread until the engine has removed the view.
636 // TODO(loicsharma): This blocks the platform thread eagerly and can
637 // cause unnecessary delay in input processing. Instead, this should block
638 // lazily only when an operation needs the view.
639 // https://github.com/flutter/flutter/issues/146248
640 captures.latch.Wait();
641
642 if (!captures.removed) {
643 // Removing the view failed. This is unexpected and indicates a bug in the
644 // Windows embedder.
645 FML_LOG(ERROR) << "FlutterEngineRemoveView failed to remove view";
646 return;
647 }
648 }
649
650 {
651 // The engine no longer presents to the view. Remove the view from the
652 // embedder.
653 std::unique_lock write_lock(views_mutex_);
654
655 FML_DCHECK(views_.find(view_id) != views_.end());
656 views_.erase(view_id);
657 }
658 }
659
660 void FlutterWindowsEngine::OnVsync(intptr_t baton) {
661 std::chrono::nanoseconds current_time =
662 std::chrono::nanoseconds(embedder_api_.GetCurrentTime());
663 std::chrono::nanoseconds frame_interval = FrameInterval();
664 auto next = SnapToNextTick(current_time, start_time_, frame_interval);
665 embedder_api_.OnVsync(engine_, baton, next.count(),
666 (next + frame_interval).count());
667 }
668
669 std::chrono::nanoseconds FlutterWindowsEngine::FrameInterval() {
670 if (frame_interval_override_.has_value()) {
671 return frame_interval_override_.value();
672 }
673 uint64_t interval = 16600000;
674
675 DWM_TIMING_INFO timing_info = {};
676 timing_info.cbSize = sizeof(timing_info);
677 HRESULT result = DwmGetCompositionTimingInfo(NULL, &timing_info);
678 if (result == S_OK && timing_info.rateRefresh.uiDenominator > 0 &&
679 timing_info.rateRefresh.uiNumerator > 0) {
680 interval = static_cast<double>(timing_info.rateRefresh.uiDenominator *
681 1000000000.0) /
682 static_cast<double>(timing_info.rateRefresh.uiNumerator);
683 }
684
685 return std::chrono::nanoseconds(interval);
686 }
687
688 FlutterWindowsView* FlutterWindowsEngine::view(FlutterViewId view_id) const {
689 std::shared_lock read_lock(views_mutex_);
690
691 auto iterator = views_.find(view_id);
692 if (iterator == views_.end()) {
693 return nullptr;
694 }
695
696 return iterator->second;
697 }
698
699 // Returns the currently configured Plugin Registrar.
700 FlutterDesktopPluginRegistrarRef FlutterWindowsEngine::GetRegistrar() {
701 return plugin_registrar_.get();
702 }
703
704 void FlutterWindowsEngine::AddPluginRegistrarDestructionCallback(
705 FlutterDesktopOnPluginRegistrarDestroyed callback,
706 FlutterDesktopPluginRegistrarRef registrar) {
707 plugin_registrar_destruction_callbacks_[callback] = registrar;
708 }
709
710 void FlutterWindowsEngine::UpdateDisplay(
711 const std::vector<FlutterEngineDisplay>& displays) {
712 if (engine_) {
713 embedder_api_.NotifyDisplayUpdate(engine_,
714 kFlutterEngineDisplaysUpdateTypeStartup,
715 displays.data(), displays.size());
716 }
717 }
718
719 void FlutterWindowsEngine::SendWindowMetricsEvent(
720 const FlutterWindowMetricsEvent& event) {
721 if (engine_) {
722 embedder_api_.SendWindowMetricsEvent(engine_, &event);
723 }
724 }
725
726 void FlutterWindowsEngine::SendPointerEvent(const FlutterPointerEvent& event) {
727 if (engine_) {
728 embedder_api_.SendPointerEvent(engine_, &event, 1);
729 }
730 }
731
732 void FlutterWindowsEngine::SendKeyEvent(const FlutterKeyEvent& event,
733 FlutterKeyEventCallback callback,
734 void* user_data) {
735 if (engine_) {
736 embedder_api_.SendKeyEvent(engine_, &event, callback, user_data);
737 }
738 }
739
740 void FlutterWindowsEngine::SendViewFocusEvent(
741 const FlutterViewFocusEvent& event) {
742 if (engine_) {
743 embedder_api_.SendViewFocusEvent(engine_, &event);
744 }
745 }
746
747 bool FlutterWindowsEngine::SendPlatformMessage(
748 const char* channel,
749 const uint8_t* message,
750 const size_t message_size,
751 const FlutterDesktopBinaryReply reply,
752 void* user_data) {
753 FlutterPlatformMessageResponseHandle* response_handle = nullptr;
754 if (reply != nullptr && user_data != nullptr) {
755 FlutterEngineResult result =
756 embedder_api_.PlatformMessageCreateResponseHandle(
757 engine_, reply, user_data, &response_handle);
758 if (result != kSuccess) {
759 FML_LOG(ERROR) << "Failed to create response handle";
760 return false;
761 }
762 }
763
764 FlutterPlatformMessage platform_message = {
765 sizeof(FlutterPlatformMessage),
766 channel,
767 message,
768 message_size,
769 response_handle,
770 };
771
772 FlutterEngineResult message_result =
773 embedder_api_.SendPlatformMessage(engine_, &platform_message);
774 if (response_handle != nullptr) {
775 embedder_api_.PlatformMessageReleaseResponseHandle(engine_,
776 response_handle);
777 }
778 return message_result == kSuccess;
779 }
780
781 void FlutterWindowsEngine::SendPlatformMessageResponse(
782 const FlutterDesktopMessageResponseHandle* handle,
783 const uint8_t* data,
784 size_t data_length) {
785 embedder_api_.SendPlatformMessageResponse(engine_, handle, data, data_length);
786 }
787
788 void FlutterWindowsEngine::HandlePlatformMessage(
789 const FlutterPlatformMessage* engine_message) {
790 if (engine_message->struct_size != sizeof(FlutterPlatformMessage)) {
791 FML_LOG(ERROR) << "Invalid message size received. Expected: "
792 << sizeof(FlutterPlatformMessage) << " but received "
793 << engine_message->struct_size;
794 return;
795 }
796
797 auto message = ConvertToDesktopMessage(*engine_message);
798
799 message_dispatcher_->HandleMessage(message, [this] {}, [this] {});
800 }
801
802 void FlutterWindowsEngine::ReloadSystemFonts() {
803 embedder_api_.ReloadSystemFonts(engine_);
804 }
805
806 void FlutterWindowsEngine::ScheduleFrame() {
807 embedder_api_.ScheduleFrame(engine_);
808 }
809
810 void FlutterWindowsEngine::SetNextFrameCallback(fml::closure callback) {
811 next_frame_callback_ = std::move(callback);
812
813 embedder_api_.SetNextFrameCallback(
814 engine_,
815 [](void* user_data) {
816 // Embedder callback runs on raster thread. Switch back to platform
817 // thread.
818 FlutterWindowsEngine* self =
819 static_cast<FlutterWindowsEngine*>(user_data);
820
821 self->task_runner_->PostTask(std::move(self->next_frame_callback_));
822 },
823 this);
824 }
825
826 HCURSOR FlutterWindowsEngine::GetCursorByName(
827 const std::string& cursor_name) const {
828 static auto* cursors = new std::map<std::string, const wchar_t*>{
829 {"allScroll", IDC_SIZEALL},
830 {"basic", IDC_ARROW},
831 {"click", IDC_HAND},
832 {"forbidden", IDC_NO},
833 {"help", IDC_HELP},
834 {"move", IDC_SIZEALL},
835 {"none", nullptr},
836 {"noDrop", IDC_NO},
837 {"precise", IDC_CROSS},
838 {"progress", IDC_APPSTARTING},
839 {"text", IDC_IBEAM},
840 {"resizeColumn", IDC_SIZEWE},
841 {"resizeDown", IDC_SIZENS},
842 {"resizeDownLeft", IDC_SIZENESW},
843 {"resizeDownRight", IDC_SIZENWSE},
844 {"resizeLeft", IDC_SIZEWE},
845 {"resizeLeftRight", IDC_SIZEWE},
846 {"resizeRight", IDC_SIZEWE},
847 {"resizeRow", IDC_SIZENS},
848 {"resizeUp", IDC_SIZENS},
849 {"resizeUpDown", IDC_SIZENS},
850 {"resizeUpLeft", IDC_SIZENWSE},
851 {"resizeUpRight", IDC_SIZENESW},
852 {"resizeUpLeftDownRight", IDC_SIZENWSE},
853 {"resizeUpRightDownLeft", IDC_SIZENESW},
854 {"wait", IDC_WAIT},
855 };
856 const wchar_t* idc_name = IDC_ARROW;
857 auto it = cursors->find(cursor_name);
858 if (it != cursors->end()) {
859 idc_name = it->second;
860 }
861 return windows_proc_table_->LoadCursor(nullptr, idc_name);
862 }
863
864 FlutterWindowsView* FlutterWindowsEngine::GetViewFromTopLevelWindow(
865 HWND hwnd) const {
866 std::shared_lock read_lock(views_mutex_);
867 auto const iterator =
868 std::find_if(views_.begin(), views_.end(), [hwnd](auto const& pair) {
869 FlutterWindowsView* const view = pair.second;
870 return GetAncestor(view->GetWindowHandle(), GA_ROOT) == hwnd;
871 });
872 if (iterator != views_.end()) {
873 return iterator->second;
874 }
875 return nullptr;
876 }
877
878 void FlutterWindowsEngine::SendSystemLocales() {
879 std::vector<LanguageInfo> languages =
880 GetPreferredLanguageInfo(*windows_proc_table_);
881 std::vector<FlutterLocale> flutter_locales;
882 flutter_locales.reserve(languages.size());
883 for (const auto& info : languages) {
884 flutter_locales.push_back(CovertToFlutterLocale(info));
885 }
886 // Convert the locale list to the locale pointer list that must be provided.
887 std::vector<const FlutterLocale*> flutter_locale_list;
888 flutter_locale_list.reserve(flutter_locales.size());
889 std::transform(flutter_locales.begin(), flutter_locales.end(),
890 std::back_inserter(flutter_locale_list),
891 [](const auto& arg) -> const auto* { return &arg; });
892 embedder_api_.UpdateLocales(engine_, flutter_locale_list.data(),
893 flutter_locale_list.size());
894 }
895
896 void FlutterWindowsEngine::InitializeKeyboard() {
897 auto internal_plugin_messenger = internal_plugin_registrar_->messenger();
898 KeyboardKeyEmbedderHandler::GetKeyStateHandler get_key_state = GetKeyState;
899 KeyboardKeyEmbedderHandler::MapVirtualKeyToScanCode map_vk_to_scan =
900 [](UINT virtual_key, bool extended) {
901 return MapVirtualKey(virtual_key,
902 extended ? MAPVK_VK_TO_VSC_EX : MAPVK_VK_TO_VSC);
903 };
904 keyboard_key_handler_ = std::move(CreateKeyboardKeyHandler(
905 internal_plugin_messenger, get_key_state, map_vk_to_scan));
906 text_input_plugin_ =
907 std::move(CreateTextInputPlugin(internal_plugin_messenger));
908 }
909
910 std::unique_ptr<KeyboardHandlerBase>
911 FlutterWindowsEngine::CreateKeyboardKeyHandler(
912 BinaryMessenger* messenger,
913 KeyboardKeyEmbedderHandler::GetKeyStateHandler get_key_state,
914 KeyboardKeyEmbedderHandler::MapVirtualKeyToScanCode map_vk_to_scan) {
915 auto keyboard_key_handler = std::make_unique<KeyboardKeyHandler>(messenger);
916 keyboard_key_handler->AddDelegate(
917 std::make_unique<KeyboardKeyEmbedderHandler>(
918 [this](const FlutterKeyEvent& event, FlutterKeyEventCallback callback,
919 void* user_data) {
920 return SendKeyEvent(event, callback, user_data);
921 },
922 get_key_state, map_vk_to_scan));
923 keyboard_key_handler->AddDelegate(
924 std::make_unique<KeyboardKeyChannelHandler>(messenger));
925 keyboard_key_handler->InitKeyboardChannel();
926 return keyboard_key_handler;
927 }
928
929 std::unique_ptr<TextInputPlugin> FlutterWindowsEngine::CreateTextInputPlugin(
930 BinaryMessenger* messenger) {
931 return std::make_unique<TextInputPlugin>(messenger, this);
932 }
933
934 bool FlutterWindowsEngine::RegisterExternalTexture(int64_t texture_id) {
935 return (embedder_api_.RegisterExternalTexture(engine_, texture_id) ==
936 kSuccess);
937 }
938
939 bool FlutterWindowsEngine::UnregisterExternalTexture(int64_t texture_id) {
940 return (embedder_api_.UnregisterExternalTexture(engine_, texture_id) ==
941 kSuccess);
942 }
943
944 bool FlutterWindowsEngine::MarkExternalTextureFrameAvailable(
945 int64_t texture_id) {
946 return (embedder_api_.MarkExternalTextureFrameAvailable(
947 engine_, texture_id) == kSuccess);
948 }
949
950 bool FlutterWindowsEngine::PostRasterThreadTask(fml::closure callback) const {
951 struct Captures {
952 fml::closure callback;
953 };
954 auto captures = new Captures();
955 captures->callback = std::move(callback);
956 if (embedder_api_.PostRenderThreadTask(
957 engine_,
958 [](void* opaque) {
959 auto captures = reinterpret_cast<Captures*>(opaque);
960 captures->callback();
961 delete captures;
962 },
963 captures) == kSuccess) {
964 return true;
965 }
966 delete captures;
967 return false;
968 }
969
970 bool FlutterWindowsEngine::DispatchSemanticsAction(
971 FlutterViewId view_id,
972 uint64_t target,
973 FlutterSemanticsAction action,
974 fml::MallocMapping data) {
975 FlutterSendSemanticsActionInfo info{
976 .struct_size = sizeof(FlutterSendSemanticsActionInfo),
977 .view_id = view_id,
978 .node_id = target,
979 .action = action,
980 .data = data.GetMapping(),
981 .data_length = data.GetSize(),
982 };
983 return (embedder_api_.SendSemanticsAction(engine_, &info));
984 }
985
986 void FlutterWindowsEngine::UpdateSemanticsEnabled(bool enabled) {
987 if (engine_ && semantics_enabled_ != enabled) {
988 std::shared_lock read_lock(views_mutex_);
989
990 semantics_enabled_ = enabled;
991 embedder_api_.UpdateSemanticsEnabled(engine_, enabled);
992 for (auto iterator = views_.begin(); iterator != views_.end(); iterator++) {
993 iterator->second->UpdateSemanticsEnabled(enabled);
994 }
995 }
996 }
997
998 void FlutterWindowsEngine::OnPreEngineRestart() {
999 // Reset the keyboard's state on hot restart.
1000 InitializeKeyboard();
1001 }
1002
1003 std::string FlutterWindowsEngine::GetExecutableName() const {
1004 std::pair<bool, std::string> result = fml::paths::GetExecutablePath();
1005 if (result.first) {
1006 const std::string& executable_path = result.second;
1007 size_t last_separator = executable_path.find_last_of("/\\");
1008 if (last_separator == std::string::npos ||
1009 last_separator == executable_path.size() - 1) {
1010 return executable_path;
1011 }
1012 return executable_path.substr(last_separator + 1);
1013 }
1014 return "Flutter";
1015 }
1016
1017 void FlutterWindowsEngine::UpdateAccessibilityFeatures() {
1018 UpdateHighContrastMode();
1019 }
1020
1021 void FlutterWindowsEngine::UpdateHighContrastMode() {
1022 high_contrast_enabled_ = windows_proc_table_->GetHighContrastEnabled();
1023
1024 SendAccessibilityFeatures();
1025 settings_plugin_->UpdateHighContrastMode(high_contrast_enabled_);
1026 }
1027
1028 void FlutterWindowsEngine::SendAccessibilityFeatures() {
1029 int flags = 0;
1030
1031 if (high_contrast_enabled_) {
1032 flags |=
1033 FlutterAccessibilityFeature::kFlutterAccessibilityFeatureHighContrast;
1034 }
1035
1036 embedder_api_.UpdateAccessibilityFeatures(
1037 engine_, static_cast<FlutterAccessibilityFeature>(flags));
1038 }
1039
1040 void FlutterWindowsEngine::RequestApplicationQuit(HWND hwnd,
1041 WPARAM wparam,
1042 LPARAM lparam,
1043 AppExitType exit_type) {
1044 platform_handler_->RequestAppExit(hwnd, wparam, lparam, exit_type, 0);
1045 }
1046
1047 void FlutterWindowsEngine::OnQuit(std::optional<HWND> hwnd,
1048 std::optional<WPARAM> wparam,
1049 std::optional<LPARAM> lparam,
1050 UINT exit_code) {
1051 lifecycle_manager_->Quit(hwnd, wparam, lparam, exit_code);
1052 }
1053
1054 void FlutterWindowsEngine::OnDwmCompositionChanged() {
1055 if (display_monitor_) {
1056 display_monitor_->UpdateDisplays();
1057 }
1058
1059 std::shared_lock read_lock(views_mutex_);
1060 for (auto iterator = views_.begin(); iterator != views_.end(); iterator++) {
1061 iterator->second->OnDwmCompositionChanged();
1062 }
1063 }
1064
1065 void FlutterWindowsEngine::OnWindowStateEvent(HWND hwnd,
1066 WindowStateEvent event) {
1067 lifecycle_manager_->OnWindowStateEvent(hwnd, event);
1068 }
1069
1070 std::optional<LRESULT> FlutterWindowsEngine::ProcessExternalWindowMessage(
1071 HWND hwnd,
1072 UINT message,
1073 WPARAM wparam,
1074 LPARAM lparam) {
1075 if (lifecycle_manager_) {
1076 return lifecycle_manager_->ExternalWindowMessage(hwnd, message, wparam,
1077 lparam);
1078 }
1079 return std::nullopt;
1080 }
1081
1082 void FlutterWindowsEngine::UpdateFlutterCursor(
1083 const std::string& cursor_name) const {
1084 SetFlutterCursor(GetCursorByName(cursor_name));
1085 }
1086
1087 void FlutterWindowsEngine::SetFlutterCursor(HCURSOR cursor) const {
1088 windows_proc_table_->SetCursor(cursor);
1089 }
1090
1091 void FlutterWindowsEngine::OnChannelUpdate(std::string name, bool listening) {
1092 if (name == "flutter/platform" && listening) {
1093 lifecycle_manager_->BeginProcessingExit();
1094 } else if (name == "flutter/lifecycle" && listening) {
1095 lifecycle_manager_->BeginProcessingLifecycle();
1096 }
1097 }
1098
1099 void FlutterWindowsEngine::OnViewFocusChangeRequest(
1100 const FlutterViewFocusChangeRequest* request) {
1101 std::shared_lock read_lock(views_mutex_);
1102
1103 auto iterator = views_.find(request->view_id);
1104 if (iterator == views_.end()) {
1105 return;
1106 }
1107
1108 FlutterWindowsView* view = iterator->second;
1109 view->Focus();
1110 }
1111
1112 bool FlutterWindowsEngine::Present(const FlutterPresentViewInfo* info) {
1113 // This runs on the raster thread. Lock the views map for the entirety of the
1114 // present operation to block the platform thread from destroying the
1115 // view during the present.
1116 std::shared_lock read_lock(views_mutex_);
1117
1118 auto iterator = views_.find(info->view_id);
1119 if (iterator == views_.end()) {
1120 return false;
1121 }
1122
1123 FlutterWindowsView* view = iterator->second;
1124
1125 return compositor_->Present(view, info->layers, info->layers_count);
1126 }
1127
1128 bool FlutterWindowsEngine::HandleDisplayMonitorMessage(HWND hwnd,
1129 UINT message,
1130 WPARAM wparam,
1131 LPARAM lparam,
1132 LRESULT* result) {
1133 if (!display_monitor_) {
1134 return false;
1135 }
1136
1137 return display_monitor_->HandleWindowMessage(hwnd, message, wparam, lparam,
1138 result);
1139 }
1140
1141 } // namespace flutter
accessibility_bridge_windows.h
binary_messenger_impl.h
flutter::AccessibilityPlugin::SetUp
static void SetUp(BinaryMessenger *binary_messenger, AccessibilityPlugin *plugin)
Definition: accessibility_plugin.cc:76
flutter::BinaryMessenger
Definition: binary_messenger.h:28
flutter::FlutterDesktopMessenger
Definition: flutter_desktop_messenger.h:23
flutter::FlutterProjectBundle
Definition: flutter_project_bundle.h:32
flutter::FlutterWindowsEngine
Definition: flutter_windows_engine.h:92
flutter::FlutterWindowsEngine::FlutterWindowsEngine
FlutterWindowsEngine(const FlutterProjectBundle &project, std::shared_ptr< WindowsProcTable > windows_proc_table=nullptr)
Definition: flutter_windows_engine.cc:151
flutter::FlutterWindowsEngine::view
FlutterWindowsView * view(FlutterViewId view_id) const
Definition: flutter_windows_engine.cc:688
flutter::FlutterWindowsEngine::OnPreEngineRestart
void OnPreEngineRestart()
Definition: flutter_windows_engine.cc:998
flutter::FlutterWindowsEngine::OnViewFocusChangeRequest
virtual void OnViewFocusChangeRequest(const FlutterViewFocusChangeRequest *request)
Definition: flutter_windows_engine.cc:1099
flutter::FlutterWindowsEngine::HandlePlatformMessage
void HandlePlatformMessage(const FlutterPlatformMessage *)
Definition: flutter_windows_engine.cc:788
flutter::FlutterWindowsEngine::OnVsync
void OnVsync(intptr_t baton)
Definition: flutter_windows_engine.cc:660
flutter::FlutterWindowsEngine::SetSwitches
void SetSwitches(const std::vector< std::string > &switches)
Definition: flutter_windows_engine.cc:263
flutter::FlutterWindowsView
Definition: flutter_windows_view.h:34
flutter::FlutterWindowsView::Focus
virtual bool Focus()
Definition: flutter_windows_view.cc:838
flutter::FlutterWindowsView::accessibility_bridge
std::weak_ptr< AccessibilityBridgeWindows > accessibility_bridge()
Definition: flutter_windows_view.h:239
flutter::KeyboardKeyEmbedderHandler::MapVirtualKeyToScanCode
std::function< SHORT(UINT, bool)> MapVirtualKeyToScanCode
Definition: keyboard_key_embedder_handler.h:43
flutter::KeyboardKeyEmbedderHandler::GetKeyStateHandler
std::function< SHORT(int)> GetKeyStateHandler
Definition: keyboard_key_embedder_handler.h:41
flutter::TaskRunner
Definition: task_runner.h:26
flutter::WindowsLifecycleManager
Definition: windows_lifecycle_manager.h:37
flutter::egl::Manager::Create
static std::unique_ptr< Manager > Create(GpuPreference gpu_preference)
Definition: manager.cc:17
flutter::egl::ProcTable::Create
static std::shared_ptr< ProcTable > Create()
Definition: proc_table.cc:12
texture_id
uint32_t texture_id
Definition: compositor_opengl.cc:20
compositor_opengl.h
compositor_software.h
displays
std::vector< FlutterEngineDisplay > * displays
Definition: display_monitor.cc:19
display_monitor.h
FlutterDesktopBinaryReply
void(* FlutterDesktopBinaryReply)(const uint8_t *data, size_t data_size, void *user_data)
Definition: flutter_messenger.h:26
FlutterDesktopMessageResponseHandle
struct _FlutterPlatformMessageResponseHandle FlutterDesktopMessageResponseHandle
Definition: flutter_messenger.h:22
FlutterDesktopOnPluginRegistrarDestroyed
void(* FlutterDesktopOnPluginRegistrarDestroyed)(FlutterDesktopPluginRegistrarRef)
Definition: flutter_plugin_registrar.h:23
flutter_project_bundle.h
RunOnSeparateThread
@ RunOnSeparateThread
Definition: flutter_windows.h:56
kAccessibilityChannelName
static constexpr char kAccessibilityChannelName[]
Definition: flutter_windows_engine.cc:36
flutter_windows_engine.h
flutter_windows_view.h
user_data
void * user_data
Definition: flutter_windows_view_unittests.cc:53
callback
FlutterDesktopBinaryReply callback
Definition: flutter_windows_view_unittests.cc:52
keyboard_key_channel_handler.h
extended
bool extended
Definition: keyboard_key_handler_unittests.cc:118
action
int action
Definition: keyboard_key_handler_unittests.cc:116
message
Win32Message message
Definition: keyboard_unittests.cc:137
flutter::egl::GpuPreference
GpuPreference
Definition: manager.h:32
flutter
Definition: accessibility_bridge_windows.cc:11
flutter::AppExitType
AppExitType
Definition: platform_handler.h:27
flutter::GetPreferredLanguageInfo
std::vector< LanguageInfo > GetPreferredLanguageInfo(const WindowsProcTable &windows_proc_table)
Definition: system_utils.cc:15
flutter::WindowStateEvent
WindowStateEvent
An event representing a change in window state that may update the.
Definition: windows_lifecycle_manager.h:24
flutter::FlutterViewId
int64_t FlutterViewId
Definition: flutter_view.h:13
flutter::WindowsPlatformThreadPrioritySetter
static void WindowsPlatformThreadPrioritySetter(FlutterThreadPriority priority)
Definition: flutter_windows_engine.h:62
flutter::kImplicitViewId
constexpr FlutterViewId kImplicitViewId
Definition: flutter_windows_engine.h:56
path_utils.h
standard_message_codec.h
FlutterDesktopMessage
Definition: flutter_messenger.h:31
FlutterDesktopPluginRegistrar
Definition: window_state.h:23
system_utils.h
task_runner.h
window_manager.h