| Flutter Windows Embedder |

flutter_window.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_window.h"
6
7 #include <WinUser.h>
8 #include <dwmapi.h>
9
10 #include <chrono>
11 #include <map>
12
13 #include "flutter/fml/logging.h"
14 #include "flutter/shell/platform/embedder/embedder.h"
15 #include "flutter/shell/platform/windows/dpi_utils.h"
16 #include "flutter/shell/platform/windows/flutter_windows_engine.h"
17 #include "flutter/shell/platform/windows/flutter_windows_view.h"
18 #include "flutter/shell/platform/windows/keyboard_utils.h"
19
20 namespace flutter {
21
22 namespace {
23
24 // The Windows DPI system is based on this
25 // constant for machines running at 100% scaling.
26 constexpr int base_dpi = 96;
27
28 static const int kMinTouchDeviceId = 0;
29 static const int kMaxTouchDeviceId = 128;
30
31 static const int kLinesPerScrollWindowsDefault = 3;
32
33 // Maps a Flutter cursor name to an HCURSOR.
34 //
35 // Returns the arrow cursor for unknown constants.
36 //
37 // This map must be kept in sync with Flutter framework's
38 // services/mouse_cursor.dart.
39 static HCURSOR GetCursorByName(const std::string& cursor_name) {
40 static auto* cursors = new std::map<std::string, const wchar_t*>{
41 {"allScroll", IDC_SIZEALL},
42 {"basic", IDC_ARROW},
43 {"click", IDC_HAND},
44 {"forbidden", IDC_NO},
45 {"help", IDC_HELP},
46 {"move", IDC_SIZEALL},
47 {"none", nullptr},
48 {"noDrop", IDC_NO},
49 {"precise", IDC_CROSS},
50 {"progress", IDC_APPSTARTING},
51 {"text", IDC_IBEAM},
52 {"resizeColumn", IDC_SIZEWE},
53 {"resizeDown", IDC_SIZENS},
54 {"resizeDownLeft", IDC_SIZENESW},
55 {"resizeDownRight", IDC_SIZENWSE},
56 {"resizeLeft", IDC_SIZEWE},
57 {"resizeLeftRight", IDC_SIZEWE},
58 {"resizeRight", IDC_SIZEWE},
59 {"resizeRow", IDC_SIZENS},
60 {"resizeUp", IDC_SIZENS},
61 {"resizeUpDown", IDC_SIZENS},
62 {"resizeUpLeft", IDC_SIZENWSE},
63 {"resizeUpRight", IDC_SIZENESW},
64 {"resizeUpLeftDownRight", IDC_SIZENWSE},
65 {"resizeUpRightDownLeft", IDC_SIZENESW},
66 {"wait", IDC_WAIT},
67 };
68 const wchar_t* idc_name = IDC_ARROW;
69 auto it = cursors->find(cursor_name);
70 if (it != cursors->end()) {
71 idc_name = it->second;
72 }
73 return ::LoadCursor(nullptr, idc_name);
74 }
75
76 static constexpr int32_t kDefaultPointerDeviceId = 0;
77
78 // This method is only valid during a window message related to mouse/touch
79 // input.
80 // See
81 // https://docs.microsoft.com/en-us/windows/win32/tablet/system-events-and-mouse-messages?redirectedfrom=MSDN#distinguishing-pen-input-from-mouse-and-touch.
82 static FlutterPointerDeviceKind GetFlutterPointerDeviceKind() {
83 constexpr LPARAM kTouchOrPenSignature = 0xFF515700;
84 constexpr LPARAM kTouchSignature = kTouchOrPenSignature | 0x80;
85 constexpr LPARAM kSignatureMask = 0xFFFFFF00;
86 LPARAM info = GetMessageExtraInfo();
87 if ((info & kSignatureMask) == kTouchOrPenSignature) {
88 if ((info & kTouchSignature) == kTouchSignature) {
89 return kFlutterPointerDeviceKindTouch;
90 }
91 return kFlutterPointerDeviceKindStylus;
92 }
93 return kFlutterPointerDeviceKindMouse;
94 }
95
96 // Translates button codes from Win32 API to FlutterPointerMouseButtons.
97 static uint64_t ConvertWinButtonToFlutterButton(UINT button) {
98 switch (button) {
99 case WM_LBUTTONDOWN:
100 case WM_LBUTTONUP:
101 return kFlutterPointerButtonMousePrimary;
102 case WM_RBUTTONDOWN:
103 case WM_RBUTTONUP:
104 return kFlutterPointerButtonMouseSecondary;
105 case WM_MBUTTONDOWN:
106 case WM_MBUTTONUP:
107 return kFlutterPointerButtonMouseMiddle;
108 case XBUTTON1:
109 return kFlutterPointerButtonMouseBack;
110 case XBUTTON2:
111 return kFlutterPointerButtonMouseForward;
112 }
113 FML_LOG(WARNING) << "Mouse button not recognized: " << button;
114 return 0;
115 }
116
117 } // namespace
118
119 FlutterWindow::FlutterWindow(
120 int width,
121 int height,
122 std::shared_ptr<WindowsProcTable> windows_proc_table,
123 std::unique_ptr<TextInputManager> text_input_manager)
124 : binding_handler_delegate_(nullptr),
125 touch_id_generator_(kMinTouchDeviceId, kMaxTouchDeviceId),
126 windows_proc_table_(std::move(windows_proc_table)),
127 text_input_manager_(std::move(text_input_manager)),
128 ax_fragment_root_(nullptr) {
129 // Get the DPI of the primary monitor as the initial DPI. If Per-Monitor V2 is
130 // supported, |current_dpi_| should be updated in the
131 // kWmDpiChangedBeforeParent message.
132 current_dpi_ = GetDpiForHWND(nullptr);
133
134 // Get initial value for wheel scroll lines
135 // TODO: Listen to changes for this value
136 // https://github.com/flutter/flutter/issues/107248
137 UpdateScrollOffsetMultiplier();
138
139 if (windows_proc_table_ == nullptr) {
140 windows_proc_table_ = std::make_unique<WindowsProcTable>();
141 }
142 if (text_input_manager_ == nullptr) {
143 text_input_manager_ = std::make_unique<TextInputManager>();
144 }
145 keyboard_manager_ = std::make_unique<KeyboardManager>(this);
146
147 InitializeChild("FLUTTERVIEW", width, height);
148 current_cursor_ = ::LoadCursor(nullptr, IDC_ARROW);
149 }
150
151 FlutterWindow::~FlutterWindow() {
152 OnWindowStateEvent(WindowStateEvent::kHide);
153 Destroy();
154 }
155
156 void FlutterWindow::SetView(WindowBindingHandlerDelegate* window) {
157 binding_handler_delegate_ = window;
158 direct_manipulation_owner_->SetBindingHandlerDelegate(window);
159 if (restored_ && window) {
160 OnWindowStateEvent(WindowStateEvent::kShow);
161 }
162 if (focused_ && window) {
163 OnWindowStateEvent(WindowStateEvent::kFocus);
164 }
165 }
166
167 float FlutterWindow::GetDpiScale() {
168 return static_cast<float>(GetCurrentDPI()) / static_cast<float>(base_dpi);
169 }
170
171 bool FlutterWindow::IsVisible() {
172 return IsWindowVisible(GetWindowHandle());
173 }
174
175 PhysicalWindowBounds FlutterWindow::GetPhysicalWindowBounds() {
176 return {GetCurrentWidth(), GetCurrentHeight()};
177 }
178
179 void FlutterWindow::UpdateFlutterCursor(const std::string& cursor_name) {
180 current_cursor_ = GetCursorByName(cursor_name);
181 }
182
183 void FlutterWindow::SetFlutterCursor(HCURSOR cursor) {
184 current_cursor_ = cursor;
185 ::SetCursor(current_cursor_);
186 }
187
188 void FlutterWindow::OnDpiScale(unsigned int dpi) {};
189
190 // When DesktopWindow notifies that a WM_Size message has come in
191 // lets FlutterEngine know about the new size.
192 void FlutterWindow::OnResize(unsigned int width, unsigned int height) {
193 if (binding_handler_delegate_ != nullptr) {
194 binding_handler_delegate_->OnWindowSizeChanged(width, height);
195 }
196 }
197
198 void FlutterWindow::OnPaint() {
199 if (binding_handler_delegate_ != nullptr) {
200 binding_handler_delegate_->OnWindowRepaint();
201 }
202 }
203
204 void FlutterWindow::OnPointerMove(double x,
205 double y,
206 FlutterPointerDeviceKind device_kind,
207 int32_t device_id,
208 int modifiers_state) {
209 binding_handler_delegate_->OnPointerMove(x, y, device_kind, device_id,
210 modifiers_state);
211 }
212
213 void FlutterWindow::OnPointerDown(double x,
214 double y,
215 FlutterPointerDeviceKind device_kind,
216 int32_t device_id,
217 UINT button) {
218 uint64_t flutter_button = ConvertWinButtonToFlutterButton(button);
219 if (flutter_button != 0) {
220 binding_handler_delegate_->OnPointerDown(
221 x, y, device_kind, device_id,
222 static_cast<FlutterPointerMouseButtons>(flutter_button));
223 }
224 }
225
226 void FlutterWindow::OnPointerUp(double x,
227 double y,
228 FlutterPointerDeviceKind device_kind,
229 int32_t device_id,
230 UINT button) {
231 uint64_t flutter_button = ConvertWinButtonToFlutterButton(button);
232 if (flutter_button != 0) {
233 binding_handler_delegate_->OnPointerUp(
234 x, y, device_kind, device_id,
235 static_cast<FlutterPointerMouseButtons>(flutter_button));
236 }
237 }
238
239 void FlutterWindow::OnPointerLeave(double x,
240 double y,
241 FlutterPointerDeviceKind device_kind,
242 int32_t device_id) {
243 binding_handler_delegate_->OnPointerLeave(x, y, device_kind, device_id);
244 }
245
246 void FlutterWindow::OnSetCursor() {
247 ::SetCursor(current_cursor_);
248 }
249
250 void FlutterWindow::OnText(const std::u16string& text) {
251 binding_handler_delegate_->OnText(text);
252 }
253
254 void FlutterWindow::OnKey(int key,
255 int scancode,
256 int action,
257 char32_t character,
258 bool extended,
259 bool was_down,
260 KeyEventCallback callback) {
261 binding_handler_delegate_->OnKey(key, scancode, action, character, extended,
262 was_down, std::move(callback));
263 }
264
265 void FlutterWindow::OnComposeBegin() {
266 binding_handler_delegate_->OnComposeBegin();
267 }
268
269 void FlutterWindow::OnComposeCommit() {
270 binding_handler_delegate_->OnComposeCommit();
271 }
272
273 void FlutterWindow::OnComposeEnd() {
274 binding_handler_delegate_->OnComposeEnd();
275 }
276
277 void FlutterWindow::OnComposeChange(const std::u16string& text,
278 int cursor_pos) {
279 binding_handler_delegate_->OnComposeChange(text, cursor_pos);
280 }
281
282 void FlutterWindow::OnUpdateSemanticsEnabled(bool enabled) {
283 binding_handler_delegate_->OnUpdateSemanticsEnabled(enabled);
284 }
285
286 void FlutterWindow::OnScroll(double delta_x,
287 double delta_y,
288 FlutterPointerDeviceKind device_kind,
289 int32_t device_id) {
290 POINT point;
291 GetCursorPos(&point);
292
293 ScreenToClient(GetWindowHandle(), &point);
294 binding_handler_delegate_->OnScroll(point.x, point.y, delta_x, delta_y,
295 GetScrollOffsetMultiplier(), device_kind,
296 device_id);
297 }
298
299 void FlutterWindow::OnCursorRectUpdated(const Rect& rect) {
300 // Convert the rect from Flutter logical coordinates to device coordinates.
301 auto scale = GetDpiScale();
302 Point origin(rect.left() * scale, rect.top() * scale);
303 Size size(rect.width() * scale, rect.height() * scale);
304 UpdateCursorRect(Rect(origin, size));
305 }
306
307 void FlutterWindow::OnResetImeComposing() {
308 AbortImeComposing();
309 }
310
311 bool FlutterWindow::OnBitmapSurfaceUpdated(const void* allocation,
312 size_t row_bytes,
313 size_t height) {
314 HDC dc = ::GetDC(GetWindowHandle());
315 BITMAPINFO bmi = {};
316 bmi.bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
317 bmi.bmiHeader.biWidth = row_bytes / 4;
318 bmi.bmiHeader.biHeight = -height;
319 bmi.bmiHeader.biPlanes = 1;
320 bmi.bmiHeader.biBitCount = 32;
321 bmi.bmiHeader.biCompression = BI_RGB;
322 bmi.bmiHeader.biSizeImage = 0;
323 int ret = SetDIBitsToDevice(dc, 0, 0, row_bytes / 4, height, 0, 0, 0, height,
324 allocation, &bmi, DIB_RGB_COLORS);
325 ::ReleaseDC(GetWindowHandle(), dc);
326 return ret != 0;
327 }
328
329 gfx::NativeViewAccessible FlutterWindow::GetNativeViewAccessible() {
330 if (binding_handler_delegate_ == nullptr) {
331 return nullptr;
332 }
333
334 return binding_handler_delegate_->GetNativeViewAccessible();
335 }
336
337 PointerLocation FlutterWindow::GetPrimaryPointerLocation() {
338 POINT point;
339 GetCursorPos(&point);
340 ScreenToClient(GetWindowHandle(), &point);
341 return {(size_t)point.x, (size_t)point.y};
342 }
343
344 void FlutterWindow::OnThemeChange() {
345 binding_handler_delegate_->OnHighContrastChanged();
346 }
347
348 ui::AXFragmentRootDelegateWin* FlutterWindow::GetAxFragmentRootDelegate() {
349 return binding_handler_delegate_->GetAxFragmentRootDelegate();
350 }
351
352 AlertPlatformNodeDelegate* FlutterWindow::GetAlertDelegate() {
353 CreateAxFragmentRoot();
354 return alert_delegate_.get();
355 }
356
357 ui::AXPlatformNodeWin* FlutterWindow::GetAlert() {
358 CreateAxFragmentRoot();
359 return alert_node_.get();
360 }
361
362 void FlutterWindow::OnWindowStateEvent(WindowStateEvent event) {
363 switch (event) {
364 case WindowStateEvent::kShow:
365 restored_ = true;
366 break;
367 case WindowStateEvent::kHide:
368 restored_ = false;
369 focused_ = false;
370 break;
371 case WindowStateEvent::kFocus:
372 focused_ = true;
373 break;
374 case WindowStateEvent::kUnfocus:
375 focused_ = false;
376 break;
377 }
378 HWND hwnd = GetWindowHandle();
379 if (hwnd && binding_handler_delegate_) {
380 binding_handler_delegate_->OnWindowStateEvent(hwnd, event);
381 }
382 }
383
384 void FlutterWindow::TrackMouseLeaveEvent(HWND hwnd) {
385 if (!tracking_mouse_leave_) {
386 TRACKMOUSEEVENT tme;
387 tme.cbSize = sizeof(tme);
388 tme.hwndTrack = hwnd;
389 tme.dwFlags = TME_LEAVE;
390 TrackMouseEvent(&tme);
391 tracking_mouse_leave_ = true;
392 }
393 }
394
395 void FlutterWindow::HandleResize(UINT width, UINT height) {
396 current_width_ = width;
397 current_height_ = height;
398 if (direct_manipulation_owner_) {
399 direct_manipulation_owner_->ResizeViewport(width, height);
400 }
401 OnResize(width, height);
402 }
403
404 FlutterWindow* FlutterWindow::GetThisFromHandle(HWND const window) noexcept {
405 return reinterpret_cast<FlutterWindow*>(
406 GetWindowLongPtr(window, GWLP_USERDATA));
407 }
408
409 void FlutterWindow::UpdateScrollOffsetMultiplier() {
410 UINT lines_per_scroll = kLinesPerScrollWindowsDefault;
411
412 // Get lines per scroll wheel value from Windows
413 SystemParametersInfo(SPI_GETWHEELSCROLLLINES, 0, &lines_per_scroll, 0);
414
415 // This logic is based off Chromium's implementation
416 // https://source.chromium.org/chromium/chromium/src/+/main:ui/events/blink/web_input_event_builders_win.cc;l=319-331
417 scroll_offset_multiplier_ =
418 static_cast<float>(lines_per_scroll) * 100.0 / 3.0;
419 }
420
421 void FlutterWindow::InitializeChild(const char* title,
422 unsigned int width,
423 unsigned int height) {
424 Destroy();
425 std::wstring converted_title = NarrowToWide(title);
426
427 WNDCLASS window_class = RegisterWindowClass(converted_title);
428
429 auto* result = CreateWindowEx(
430 0, window_class.lpszClassName, converted_title.c_str(),
431 WS_CHILD | WS_VISIBLE, CW_DEFAULT, CW_DEFAULT, width, height,
432 HWND_MESSAGE, nullptr, window_class.hInstance, this);
433
434 if (result == nullptr) {
435 auto error = GetLastError();
436 LPWSTR message = nullptr;
437 size_t size = FormatMessageW(
438 FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM |
439 FORMAT_MESSAGE_IGNORE_INSERTS,
440 NULL, error, MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
441 reinterpret_cast<LPWSTR>(&message), 0, NULL);
442 OutputDebugString(message);
443 LocalFree(message);
444 }
445 SetUserObjectInformationA(GetCurrentProcess(),
446 UOI_TIMERPROC_EXCEPTION_SUPPRESSION, FALSE, 1);
447 // SetTimer is not precise, if a 16 ms interval is requested, it will instead
448 // often fire in an interval of 32 ms. Providing a value of 14 will ensure it
449 // runs every 16 ms, which will allow for 60 Hz trackpad gesture events, which
450 // is the maximal frequency supported by SetTimer.
451 SetTimer(result, kDirectManipulationTimer, 14, nullptr);
452 direct_manipulation_owner_ = std::make_unique<DirectManipulationOwner>(this);
453 direct_manipulation_owner_->Init(width, height);
454 }
455
456 HWND FlutterWindow::GetWindowHandle() {
457 return window_handle_;
458 }
459
460 BOOL FlutterWindow::Win32PeekMessage(LPMSG lpMsg,
461 UINT wMsgFilterMin,
462 UINT wMsgFilterMax,
463 UINT wRemoveMsg) {
464 return ::PeekMessage(lpMsg, window_handle_, wMsgFilterMin, wMsgFilterMax,
465 wRemoveMsg);
466 }
467
468 uint32_t FlutterWindow::Win32MapVkToChar(uint32_t virtual_key) {
469 return ::MapVirtualKey(virtual_key, MAPVK_VK_TO_CHAR);
470 }
471
472 UINT FlutterWindow::Win32DispatchMessage(UINT Msg,
473 WPARAM wParam,
474 LPARAM lParam) {
475 return ::SendMessage(window_handle_, Msg, wParam, lParam);
476 }
477
478 std::wstring FlutterWindow::NarrowToWide(const char* source) {
479 size_t length = strlen(source);
480 size_t outlen = 0;
481 std::wstring wideTitle(length, L'#');
482 mbstowcs_s(&outlen, &wideTitle[0], length + 1, source, length);
483 return wideTitle;
484 }
485
486 WNDCLASS FlutterWindow::RegisterWindowClass(std::wstring& title) {
487 window_class_name_ = title;
488
489 WNDCLASS window_class{};
490 window_class.hCursor = LoadCursor(nullptr, IDC_ARROW);
491 window_class.lpszClassName = title.c_str();
492 window_class.style = CS_HREDRAW | CS_VREDRAW;
493 window_class.cbClsExtra = 0;
494 window_class.cbWndExtra = 0;
495 window_class.hInstance = GetModuleHandle(nullptr);
496 window_class.hIcon = nullptr;
497 window_class.hbrBackground = 0;
498 window_class.lpszMenuName = nullptr;
499 window_class.lpfnWndProc = WndProc;
500 RegisterClass(&window_class);
501 return window_class;
502 }
503
504 LRESULT CALLBACK FlutterWindow::WndProc(HWND const window,
505 UINT const message,
506 WPARAM const wparam,
507 LPARAM const lparam) noexcept {
508 if (message == WM_NCCREATE) {
509 auto cs = reinterpret_cast<CREATESTRUCT*>(lparam);
510 SetWindowLongPtr(window, GWLP_USERDATA,
511 reinterpret_cast<LONG_PTR>(cs->lpCreateParams));
512
513 auto that = static_cast<FlutterWindow*>(cs->lpCreateParams);
514 that->window_handle_ = window;
515 that->text_input_manager_->SetWindowHandle(window);
516 RegisterTouchWindow(window, 0);
517 } else if (FlutterWindow* that = GetThisFromHandle(window)) {
518 return that->HandleMessage(message, wparam, lparam);
519 }
520
521 return DefWindowProc(window, message, wparam, lparam);
522 }
523
524 LRESULT
525 FlutterWindow::HandleMessage(UINT const message,
526 WPARAM const wparam,
527 LPARAM const lparam) noexcept {
528 LPARAM result_lparam = lparam;
529 int xPos = 0, yPos = 0;
530 UINT width = 0, height = 0;
531 UINT button_pressed = 0;
532 FlutterPointerDeviceKind device_kind;
533
534 switch (message) {
535 case kWmDpiChangedBeforeParent:
536 current_dpi_ = GetDpiForHWND(window_handle_);
537 OnDpiScale(current_dpi_);
538 return 0;
539 case WM_SIZE:
540 width = LOWORD(lparam);
541 height = HIWORD(lparam);
542
543 current_width_ = width;
544 current_height_ = height;
545 HandleResize(width, height);
546
547 OnWindowStateEvent(width == 0 && height == 0 ? WindowStateEvent::kHide
548 : WindowStateEvent::kShow);
549 break;
550 case WM_PAINT:
551 OnPaint();
552 break;
553 case WM_TOUCH: {
554 UINT num_points = LOWORD(wparam);
555 touch_points_.resize(num_points);
556 auto touch_input_handle = reinterpret_cast<HTOUCHINPUT>(lparam);
557 if (GetTouchInputInfo(touch_input_handle, num_points,
558 touch_points_.data(), sizeof(TOUCHINPUT))) {
559 for (const auto& touch : touch_points_) {
560 // Generate a mapped ID for the Windows-provided touch ID
561 auto touch_id = touch_id_generator_.GetGeneratedId(touch.dwID);
562
563 POINT pt = {TOUCH_COORD_TO_PIXEL(touch.x),
564 TOUCH_COORD_TO_PIXEL(touch.y)};
565 ScreenToClient(window_handle_, &pt);
566 auto x = static_cast<double>(pt.x);
567 auto y = static_cast<double>(pt.y);
568
569 if (touch.dwFlags & TOUCHEVENTF_DOWN) {
570 OnPointerDown(x, y, kFlutterPointerDeviceKindTouch, touch_id,
571 WM_LBUTTONDOWN);
572 } else if (touch.dwFlags & TOUCHEVENTF_MOVE) {
573 OnPointerMove(x, y, kFlutterPointerDeviceKindTouch, touch_id, 0);
574 } else if (touch.dwFlags & TOUCHEVENTF_UP) {
575 OnPointerUp(x, y, kFlutterPointerDeviceKindTouch, touch_id,
576 WM_LBUTTONDOWN);
577 OnPointerLeave(x, y, kFlutterPointerDeviceKindTouch, touch_id);
578 touch_id_generator_.ReleaseNumber(touch.dwID);
579 }
580 }
581 CloseTouchInputHandle(touch_input_handle);
582 }
583 return 0;
584 }
585 case WM_MOUSEMOVE:
586 device_kind = GetFlutterPointerDeviceKind();
587 if (device_kind == kFlutterPointerDeviceKindMouse) {
588 TrackMouseLeaveEvent(window_handle_);
589
590 xPos = GET_X_LPARAM(lparam);
591 yPos = GET_Y_LPARAM(lparam);
592 mouse_x_ = static_cast<double>(xPos);
593 mouse_y_ = static_cast<double>(yPos);
594
595 int mods = 0;
596 if (wparam & MK_CONTROL) {
597 mods |= kControl;
598 }
599 if (wparam & MK_SHIFT) {
600 mods |= kShift;
601 }
602 OnPointerMove(mouse_x_, mouse_y_, device_kind, kDefaultPointerDeviceId,
603 mods);
604 }
605 break;
606 case WM_MOUSELEAVE:
607 device_kind = GetFlutterPointerDeviceKind();
608 if (device_kind == kFlutterPointerDeviceKindMouse) {
609 OnPointerLeave(mouse_x_, mouse_y_, device_kind,
610 kDefaultPointerDeviceId);
611 }
612
613 // Once the tracked event is received, the TrackMouseEvent function
614 // resets. Set to false to make sure it's called once mouse movement is
615 // detected again.
616 tracking_mouse_leave_ = false;
617 break;
618 case WM_SETCURSOR: {
619 UINT hit_test_result = LOWORD(lparam);
620 if (hit_test_result == HTCLIENT) {
621 OnSetCursor();
622 return TRUE;
623 }
624 break;
625 }
626 case WM_SETFOCUS:
627 OnWindowStateEvent(WindowStateEvent::kFocus);
628 ::CreateCaret(window_handle_, nullptr, 1, 1);
629 break;
630 case WM_KILLFOCUS:
631 OnWindowStateEvent(WindowStateEvent::kUnfocus);
632 ::DestroyCaret();
633 break;
634 case WM_LBUTTONDOWN:
635 case WM_RBUTTONDOWN:
636 case WM_MBUTTONDOWN:
637 case WM_XBUTTONDOWN:
638 device_kind = GetFlutterPointerDeviceKind();
639 if (device_kind != kFlutterPointerDeviceKindMouse) {
640 break;
641 }
642
643 if (message == WM_LBUTTONDOWN) {
644 // Capture the pointer in case the user drags outside the client area.
645 // In this case, the "mouse leave" event is delayed until the user
646 // releases the button. It's only activated on left click given that
647 // it's more common for apps to handle dragging with only the left
648 // button.
649 SetCapture(window_handle_);
650 }
651 button_pressed = message;
652 if (message == WM_XBUTTONDOWN) {
653 button_pressed = GET_XBUTTON_WPARAM(wparam);
654 }
655 xPos = GET_X_LPARAM(lparam);
656 yPos = GET_Y_LPARAM(lparam);
657 OnPointerDown(static_cast<double>(xPos), static_cast<double>(yPos),
658 device_kind, kDefaultPointerDeviceId, button_pressed);
659 break;
660 case WM_LBUTTONUP:
661 case WM_RBUTTONUP:
662 case WM_MBUTTONUP:
663 case WM_XBUTTONUP:
664 device_kind = GetFlutterPointerDeviceKind();
665 if (device_kind != kFlutterPointerDeviceKindMouse) {
666 break;
667 }
668
669 if (message == WM_LBUTTONUP) {
670 ReleaseCapture();
671 }
672 button_pressed = message;
673 if (message == WM_XBUTTONUP) {
674 button_pressed = GET_XBUTTON_WPARAM(wparam);
675 }
676 xPos = GET_X_LPARAM(lparam);
677 yPos = GET_Y_LPARAM(lparam);
678 OnPointerUp(static_cast<double>(xPos), static_cast<double>(yPos),
679 device_kind, kDefaultPointerDeviceId, button_pressed);
680 break;
681 case WM_MOUSEWHEEL:
682 OnScroll(0.0,
683 -(static_cast<short>(HIWORD(wparam)) /
684 static_cast<double>(WHEEL_DELTA)),
685 kFlutterPointerDeviceKindMouse, kDefaultPointerDeviceId);
686 break;
687 case WM_MOUSEHWHEEL:
688 OnScroll((static_cast<short>(HIWORD(wparam)) /
689 static_cast<double>(WHEEL_DELTA)),
690 0.0, kFlutterPointerDeviceKindMouse, kDefaultPointerDeviceId);
691 break;
692 case WM_GETOBJECT: {
693 LRESULT lresult = OnGetObject(message, wparam, lparam);
694 if (lresult) {
695 return lresult;
696 }
697 break;
698 }
699 case WM_TIMER:
700 if (wparam == kDirectManipulationTimer) {
701 direct_manipulation_owner_->Update();
702 return 0;
703 }
704 break;
705 case DM_POINTERHITTEST: {
706 if (direct_manipulation_owner_) {
707 UINT contact_id = GET_POINTERID_WPARAM(wparam);
708 POINTER_INPUT_TYPE pointer_type;
709 if (windows_proc_table_->GetPointerType(contact_id, &pointer_type) &&
710 pointer_type == PT_TOUCHPAD) {
711 direct_manipulation_owner_->SetContact(contact_id);
712 }
713 }
714 break;
715 }
716 case WM_INPUTLANGCHANGE:
717 // TODO(cbracken): pass this to TextInputManager to aid with
718 // language-specific issues.
719 break;
720 case WM_IME_SETCONTEXT:
721 OnImeSetContext(message, wparam, lparam);
722 // Strip the ISC_SHOWUICOMPOSITIONWINDOW bit from lparam before passing it
723 // to DefWindowProc() so that the composition window is hidden since
724 // Flutter renders the composing string itself.
725 result_lparam &= ~ISC_SHOWUICOMPOSITIONWINDOW;
726 break;
727 case WM_IME_STARTCOMPOSITION:
728 OnImeStartComposition(message, wparam, lparam);
729 // Suppress further processing by DefWindowProc() so that the default
730 // system IME style isn't used, but rather the one set in the
731 // WM_IME_SETCONTEXT handler.
732 return TRUE;
733 case WM_IME_COMPOSITION:
734 OnImeComposition(message, wparam, lparam);
735 if (lparam & GCS_RESULTSTR || lparam & GCS_COMPSTR) {
736 // Suppress further processing by DefWindowProc() since otherwise it
737 // will emit the result string as WM_CHAR messages on commit. Instead,
738 // committing the composing text to the EditableText string is handled
739 // in TextInputModel::CommitComposing, triggered by
740 // OnImeEndComposition().
741 return TRUE;
742 }
743 break;
744 case WM_IME_ENDCOMPOSITION:
745 OnImeEndComposition(message, wparam, lparam);
746 return TRUE;
747 case WM_IME_REQUEST:
748 OnImeRequest(message, wparam, lparam);
749 break;
750 case WM_UNICHAR: {
751 // Tell third-pary app, we can support Unicode.
752 if (wparam == UNICODE_NOCHAR)
753 return TRUE;
754 // DefWindowProc will send WM_CHAR for this WM_UNICHAR.
755 break;
756 }
757 case WM_THEMECHANGED:
758 OnThemeChange();
759 break;
760 case WM_DEADCHAR:
761 case WM_SYSDEADCHAR:
762 case WM_CHAR:
763 case WM_SYSCHAR:
764 case WM_KEYDOWN:
765 case WM_SYSKEYDOWN:
766 case WM_KEYUP:
767 case WM_SYSKEYUP:
768 if (keyboard_manager_->HandleMessage(message, wparam, lparam)) {
769 return 0;
770 }
771 break;
772 }
773
774 return Win32DefWindowProc(window_handle_, message, wparam, result_lparam);
775 }
776
777 LRESULT FlutterWindow::OnGetObject(UINT const message,
778 WPARAM const wparam,
779 LPARAM const lparam) {
780 LRESULT reference_result = static_cast<LRESULT>(0L);
781
782 // Only the lower 32 bits of lparam are valid when checking the object id
783 // because it sometimes gets sign-extended incorrectly (but not always).
784 DWORD obj_id = static_cast<DWORD>(static_cast<DWORD_PTR>(lparam));
785
786 bool is_uia_request = static_cast<DWORD>(UiaRootObjectId) == obj_id;
787 bool is_msaa_request = static_cast<DWORD>(OBJID_CLIENT) == obj_id;
788
789 if (is_uia_request || is_msaa_request) {
790 // On Windows, we don't get a notification that the screen reader has been
791 // enabled or disabled. There is an API to query for screen reader state,
792 // but that state isn't set by all screen readers, including by Narrator,
793 // the screen reader that ships with Windows:
794 // https://docs.microsoft.com/en-us/windows/win32/winauto/screen-reader-parameter
795 //
796 // Instead, we enable semantics in Flutter if Windows issues queries for
797 // Microsoft Active Accessibility (MSAA) COM objects.
798 OnUpdateSemanticsEnabled(true);
799 }
800
801 gfx::NativeViewAccessible root_view = GetNativeViewAccessible();
802 // TODO(schectman): UIA is currently disabled by default.
803 // https://github.com/flutter/flutter/issues/114547
804 if (root_view) {
805 CreateAxFragmentRoot();
806 if (is_uia_request) {
807 #ifdef FLUTTER_ENGINE_USE_UIA
808 // Retrieve UIA object for the root view.
809 Microsoft::WRL::ComPtr<IRawElementProviderSimple> root;
810 if (SUCCEEDED(
811 ax_fragment_root_->GetNativeViewAccessible()->QueryInterface(
812 IID_PPV_ARGS(&root)))) {
813 // Return the UIA object via UiaReturnRawElementProvider(). See:
814 // https://docs.microsoft.com/en-us/windows/win32/winauto/wm-getobject
815 reference_result = UiaReturnRawElementProvider(window_handle_, wparam,
816 lparam, root.Get());
817 } else {
818 FML_LOG(ERROR) << "Failed to query AX fragment root.";
819 }
820 #endif // FLUTTER_ENGINE_USE_UIA
821 } else if (is_msaa_request) {
822 // Create the accessibility root if it does not already exist.
823 // Return the IAccessible for the root view.
824 Microsoft::WRL::ComPtr<IAccessible> root;
825 ax_fragment_root_->GetNativeViewAccessible()->QueryInterface(
826 IID_PPV_ARGS(&root));
827 reference_result = LresultFromObject(IID_IAccessible, wparam, root.Get());
828 }
829 }
830 return reference_result;
831 }
832
833 void FlutterWindow::OnImeSetContext(UINT const message,
834 WPARAM const wparam,
835 LPARAM const lparam) {
836 if (wparam != 0) {
837 text_input_manager_->CreateImeWindow();
838 }
839 }
840
841 void FlutterWindow::OnImeStartComposition(UINT const message,
842 WPARAM const wparam,
843 LPARAM const lparam) {
844 text_input_manager_->CreateImeWindow();
845 OnComposeBegin();
846 }
847
848 void FlutterWindow::OnImeComposition(UINT const message,
849 WPARAM const wparam,
850 LPARAM const lparam) {
851 // Update the IME window position.
852 text_input_manager_->UpdateImeWindow();
853
854 if (lparam == 0) {
855 OnComposeChange(u"", 0);
856 OnComposeCommit();
857 }
858
859 // Process GCS_RESULTSTR at fisrt, because Google Japanese Input and ATOK send
860 // both GCS_RESULTSTR and GCS_COMPSTR to commit composed text and send new
861 // composing text.
862 if (lparam & GCS_RESULTSTR) {
863 // Commit but don't end composing.
864 // Read the committed composing string.
865 long pos = text_input_manager_->GetComposingCursorPosition();
866 std::optional<std::u16string> text = text_input_manager_->GetResultString();
867 if (text) {
868 OnComposeChange(text.value(), pos);
869 OnComposeCommit();
870 }
871 }
872 if (lparam & GCS_COMPSTR) {
873 // Read the in-progress composing string.
874 long pos = text_input_manager_->GetComposingCursorPosition();
875 std::optional<std::u16string> text =
876 text_input_manager_->GetComposingString();
877 if (text) {
878 OnComposeChange(text.value(), pos);
879 }
880 }
881 }
882
883 void FlutterWindow::OnImeEndComposition(UINT const message,
884 WPARAM const wparam,
885 LPARAM const lparam) {
886 text_input_manager_->DestroyImeWindow();
887 OnComposeEnd();
888 }
889
890 void FlutterWindow::OnImeRequest(UINT const message,
891 WPARAM const wparam,
892 LPARAM const lparam) {
893 // TODO(cbracken): Handle IMR_RECONVERTSTRING, IMR_DOCUMENTFEED,
894 // and IMR_QUERYCHARPOSITION messages.
895 // https://github.com/flutter/flutter/issues/74547
896 }
897
898 void FlutterWindow::AbortImeComposing() {
899 text_input_manager_->AbortComposing();
900 }
901
902 void FlutterWindow::UpdateCursorRect(const Rect& rect) {
903 text_input_manager_->UpdateCaretRect(rect);
904 }
905
906 UINT FlutterWindow::GetCurrentDPI() {
907 return current_dpi_;
908 }
909
910 UINT FlutterWindow::GetCurrentWidth() {
911 return current_width_;
912 }
913
914 UINT FlutterWindow::GetCurrentHeight() {
915 return current_height_;
916 }
917
918 float FlutterWindow::GetScrollOffsetMultiplier() {
919 return scroll_offset_multiplier_;
920 }
921
922 LRESULT FlutterWindow::Win32DefWindowProc(HWND hWnd,
923 UINT Msg,
924 WPARAM wParam,
925 LPARAM lParam) {
926 return ::DefWindowProc(hWnd, Msg, wParam, lParam);
927 }
928
929 void FlutterWindow::Destroy() {
930 if (window_handle_) {
931 text_input_manager_->SetWindowHandle(nullptr);
932 DestroyWindow(window_handle_);
933 window_handle_ = nullptr;
934 }
935
936 UnregisterClass(window_class_name_.c_str(), nullptr);
937 }
938
939 void FlutterWindow::CreateAxFragmentRoot() {
940 if (ax_fragment_root_) {
941 return;
942 }
943 ax_fragment_root_ = std::make_unique<ui::AXFragmentRootWin>(
944 window_handle_, GetAxFragmentRootDelegate());
945 alert_delegate_ =
946 std::make_unique<AlertPlatformNodeDelegate>(*ax_fragment_root_);
947 ui::AXPlatformNode* alert_node =
948 ui::AXPlatformNodeWin::Create(alert_delegate_.get());
949 alert_node_.reset(static_cast<ui::AXPlatformNodeWin*>(alert_node));
950 ax_fragment_root_->SetAlertNode(alert_node_.get());
951 }
952
953 } // namespace flutter
flutter::AlertPlatformNodeDelegate
Definition: alert_platform_node_delegate.h:18
flutter::WindowStateEvent
WindowStateEvent
An event representing a change in window state that may update the.
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virtual HWND GetWindowHandle() override
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UINT GetCurrentHeight()
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flutter::WindowStateEvent::kHide
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flutter::FlutterWindow::OnComposeBegin
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scancode
int scancode
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flutter::FlutterWindow::GetDpiScale
virtual float GetDpiScale() override
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was_down
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extended
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flutter::FlutterWindow::Win32DispatchMessage
virtual UINT Win32DispatchMessage(UINT Msg, WPARAM wParam, LPARAM lParam) override
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flutter::FlutterWindow::OnCursorRectUpdated
virtual void OnCursorRectUpdated(const Rect &rect) override
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flutter::FlutterWindow::GetCurrentWidth
UINT GetCurrentWidth()
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flutter::FlutterWindow::NarrowToWide
std::wstring NarrowToWide(const char *source)
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virtual void OnImeEndComposition(UINT const message, WPARAM const wparam, LPARAM const lparam)
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flutter::WindowBindingHandlerDelegate::OnPointerMove
virtual void OnPointerMove(double x, double y, FlutterPointerDeviceKind device_kind, int32_t device_id, int modifiers_state)=0
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virtual LRESULT OnGetObject(UINT const message, WPARAM const wparam, LPARAM const lparam)
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virtual ui::AXFragmentRootDelegateWin * GetAxFragmentRootDelegate()=0
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virtual ui::AXFragmentRootDelegateWin * GetAxFragmentRootDelegate()
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virtual void OnText(const std::u16string &text) override
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virtual ui::AXPlatformNodeWin * GetAlert() override
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flutter::FlutterWindow::Win32PeekMessage
virtual BOOL Win32PeekMessage(LPMSG lpMsg, UINT wMsgFilterMin, UINT wMsgFilterMax, UINT wRemoveMsg) override
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Definition: geometry.h:33
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virtual bool IsVisible() override
Definition: flutter_window.cc:171
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Definition: keyboard_key_handler_unittests.cc:114
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virtual void OnPointerUp(double x, double y, FlutterPointerDeviceKind device_kind, int32_t device_id, FlutterPointerMouseButtons button)=0
flutter::WindowBindingHandlerDelegate::OnComposeChange
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virtual void OnUpdateSemanticsEnabled(bool enabled)=0
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virtual void OnWindowSizeChanged(size_t width, size_t height)=0
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callback
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Definition: flutter_windows_view_unittests.cc:48
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virtual void UpdateCursorRect(const Rect &rect)
Definition: flutter_window.cc:902