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flutter_window.h
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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 #ifndef FLUTTER_SHELL_PLATFORM_WINDOWS_FLUTTER_WINDOW_H_
6 #define FLUTTER_SHELL_PLATFORM_WINDOWS_FLUTTER_WINDOW_H_
7
8 #include <string>
9 #include <vector>
10
11 #include "flutter/fml/macros.h"
12 #include "flutter/shell/platform/common/alert_platform_node_delegate.h"
13 #include "flutter/shell/platform/common/geometry.h"
14 #include "flutter/shell/platform/embedder/embedder.h"
15 #include "flutter/shell/platform/windows/direct_manipulation.h"
16 #include "flutter/shell/platform/windows/flutter_windows_view.h"
17 #include "flutter/shell/platform/windows/keyboard_manager.h"
18 #include "flutter/shell/platform/windows/sequential_id_generator.h"
19 #include "flutter/shell/platform/windows/text_input_manager.h"
20 #include "flutter/shell/platform/windows/window_binding_handler.h"
21 #include "flutter/shell/platform/windows/windows_lifecycle_manager.h"
22 #include "flutter/shell/platform/windows/windows_proc_table.h"
23 #include "flutter/shell/platform/windows/windowsx_shim.h"
24 #include "flutter/third_party/accessibility/ax/platform/ax_fragment_root_delegate_win.h"
25 #include "flutter/third_party/accessibility/ax/platform/ax_fragment_root_win.h"
26 #include "flutter/third_party/accessibility/ax/platform/ax_platform_node_win.h"
27 #include "flutter/third_party/accessibility/gfx/native_widget_types.h"
28
29 namespace flutter {
30
31 // A win32 flutter child window used as implementations for flutter view. In
32 // the future, there will likely be a CoreWindow-based FlutterWindow as well.
33 // At the point may make sense to dependency inject the native window rather
34 // than inherit.
35 class FlutterWindow : public KeyboardManager::WindowDelegate,
36 public WindowBindingHandler {
37 public:
38 // Create flutter Window for use as child window
39 FlutterWindow(int width,
40 int height,
41 std::shared_ptr<WindowsProcTable> windows_proc_table = nullptr,
42 std::unique_ptr<TextInputManager> text_input_manager = nullptr);
43
44 virtual ~FlutterWindow();
45
46 // Initializes as a child window with size using |width| and |height| and
47 // |title| to identify the windowclass. Does not show window, window must be
48 // parented into window hierarchy by caller.
49 void InitializeChild(const char* title,
50 unsigned int width,
51 unsigned int height);
52
53 // |KeyboardManager::WindowDelegate|
54 virtual BOOL Win32PeekMessage(LPMSG lpMsg,
55 UINT wMsgFilterMin,
56 UINT wMsgFilterMax,
57 UINT wRemoveMsg) override;
58
59 // |KeyboardManager::WindowDelegate|
60 virtual uint32_t Win32MapVkToChar(uint32_t virtual_key) override;
61
62 // |KeyboardManager::WindowDelegate|
63 virtual UINT Win32DispatchMessage(UINT Msg,
64 WPARAM wParam,
65 LPARAM lParam) override;
66
67 // Called when the DPI changes either when a
68 // user drags the window between monitors of differing DPI or when the user
69 // manually changes the scale factor.
70 virtual void OnDpiScale(unsigned int dpi);
71
72 // Called when a resize occurs.
73 virtual void OnResize(unsigned int width, unsigned int height);
74
75 // Called when a paint is requested.
76 virtual void OnPaint();
77
78 // Called when the pointer moves within the
79 // window bounds.
80 virtual void OnPointerMove(double x,
81 double y,
82 FlutterPointerDeviceKind device_kind,
83 int32_t device_id,
84 int modifiers_state);
85
86 // Called when the a mouse button, determined by |button|, goes down.
87 virtual void OnPointerDown(double x,
88 double y,
89 FlutterPointerDeviceKind device_kind,
90 int32_t device_id,
91 UINT button);
92
93 // Called when the a mouse button, determined by |button|, goes from
94 // down to up
95 virtual void OnPointerUp(double x,
96 double y,
97 FlutterPointerDeviceKind device_kind,
98 int32_t device_id,
99 UINT button);
100
101 // Called when the mouse leaves the window.
102 virtual void OnPointerLeave(double x,
103 double y,
104 FlutterPointerDeviceKind device_kind,
105 int32_t device_id);
106
107 // Called when the cursor should be set for the client area.
108 virtual void OnSetCursor();
109
110 // |WindowBindingHandlerDelegate|
111 virtual void OnText(const std::u16string& text) override;
112
113 // |WindowBindingHandlerDelegate|
114 virtual void OnKey(int key,
115 int scancode,
116 int action,
117 char32_t character,
118 bool extended,
119 bool was_down,
120 KeyEventCallback callback) override;
121
122 // Called when IME composing begins.
123 virtual void OnComposeBegin();
124
125 // Called when IME composing text is committed.
126 virtual void OnComposeCommit();
127
128 // Called when IME composing ends.
129 virtual void OnComposeEnd();
130
131 // Called when IME composing text or cursor position changes.
132 virtual void OnComposeChange(const std::u16string& text, int cursor_pos);
133
134 // |FlutterWindowBindingHandler|
135 virtual void OnCursorRectUpdated(const Rect& rect) override;
136
137 // |FlutterWindowBindingHandler|
138 virtual void OnResetImeComposing() override;
139
140 // Called when accessibility support is enabled or disabled.
141 virtual void OnUpdateSemanticsEnabled(bool enabled);
142
143 // Called when mouse scrollwheel input occurs.
144 virtual void OnScroll(double delta_x,
145 double delta_y,
146 FlutterPointerDeviceKind device_kind,
147 int32_t device_id);
148
149 // Returns the root view accessibility node, or nullptr if none.
150 virtual gfx::NativeViewAccessible GetNativeViewAccessible();
151
152 // |FlutterWindowBindingHandler|
153 virtual void SetView(WindowBindingHandlerDelegate* view) override;
154
155 // |FlutterWindowBindingHandler|
156 virtual HWND GetWindowHandle() override;
157
158 // |FlutterWindowBindingHandler|
159 virtual float GetDpiScale() override;
160
161 // |FlutterWindowBindingHandler|
162 virtual bool IsVisible() override;
163
164 // |FlutterWindowBindingHandler|
165 virtual PhysicalWindowBounds GetPhysicalWindowBounds() override;
166
167 // |FlutterWindowBindingHandler|
168 virtual void UpdateFlutterCursor(const std::string& cursor_name) override;
169
170 // |FlutterWindowBindingHandler|
171 virtual void SetFlutterCursor(HCURSOR cursor) override;
172
173 // |FlutterWindowBindingHandler|
174 virtual bool OnBitmapSurfaceUpdated(const void* allocation,
175 size_t row_bytes,
176 size_t height) override;
177
178 // |FlutterWindowBindingHandler|
179 virtual PointerLocation GetPrimaryPointerLocation() override;
180
181 // Called when a theme change message is issued.
182 virtual void OnThemeChange();
183
184 // |WindowBindingHandler|
185 virtual AlertPlatformNodeDelegate* GetAlertDelegate() override;
186
187 // |WindowBindingHandler|
188 virtual ui::AXPlatformNodeWin* GetAlert() override;
189
190 // Called to obtain a pointer to the fragment root delegate.
191 virtual ui::AXFragmentRootDelegateWin* GetAxFragmentRootDelegate();
192
193 // Called on a resize or focus event.
194 virtual void OnWindowStateEvent(WindowStateEvent event);
195
196 protected:
197 // Win32's DefWindowProc.
198 //
199 // Used as the fallback behavior of HandleMessage. Exposed for dependency
200 // injection.
201 virtual LRESULT Win32DefWindowProc(HWND hWnd,
202 UINT Msg,
203 WPARAM wParam,
204 LPARAM lParam);
205
206 // Converts a c string to a wide unicode string.
207 std::wstring NarrowToWide(const char* source);
208
209 // Processes and route salient window messages for mouse handling,
210 // size change and DPI. Delegates handling of these to member overloads that
211 // inheriting classes can handle.
212 LRESULT HandleMessage(UINT const message,
213 WPARAM const wparam,
214 LPARAM const lparam) noexcept;
215
216 // Called when the OS requests a COM object.
217 //
218 // The primary use of this function is to supply Windows with wrapped
219 // semantics objects for use by Windows accessibility.
220 virtual LRESULT OnGetObject(UINT const message,
221 WPARAM const wparam,
222 LPARAM const lparam);
223
224 // Called when a window is activated in order to configure IME support for
225 // multi-step text input.
226 virtual void OnImeSetContext(UINT const message,
227 WPARAM const wparam,
228 LPARAM const lparam);
229
230 // Called when multi-step text input begins when using an IME.
231 virtual void OnImeStartComposition(UINT const message,
232 WPARAM const wparam,
233 LPARAM const lparam);
234
235 // Called when edits/commit of multi-step text input occurs when using an IME.
236 virtual void OnImeComposition(UINT const message,
237 WPARAM const wparam,
238 LPARAM const lparam);
239
240 // Called when multi-step text input ends when using an IME.
241 virtual void OnImeEndComposition(UINT const message,
242 WPARAM const wparam,
243 LPARAM const lparam);
244
245 // Called when the user triggers an IME-specific request such as input
246 // reconversion, where an existing input sequence is returned to composing
247 // mode to select an alternative candidate conversion.
248 virtual void OnImeRequest(UINT const message,
249 WPARAM const wparam,
250 LPARAM const lparam);
251
252 // Called when the app ends IME composing, such as when the text input client
253 // is cleared or changed.
254 virtual void AbortImeComposing();
255
256 // Called when the cursor rect has been updated.
257 //
258 // |rect| is in Win32 window coordinates.
259 virtual void UpdateCursorRect(const Rect& rect);
260
261 UINT GetCurrentDPI();
262
263 UINT GetCurrentWidth();
264
265 UINT GetCurrentHeight();
266
267 // Returns the current pixel per scroll tick value.
268 virtual float GetScrollOffsetMultiplier();
269
270 // Delegate to a alert_node_ used to set the announcement text.
271 std::unique_ptr<AlertPlatformNodeDelegate> alert_delegate_;
272
273 // Accessibility node that represents an alert.
274 std::unique_ptr<ui::AXPlatformNodeWin> alert_node_;
275
276 // Handles running DirectManipulation on the window to receive trackpad
277 // gestures.
278 std::unique_ptr<DirectManipulationOwner> direct_manipulation_owner_;
279
280 private:
281 // OS callback called by message pump. Handles the WM_NCCREATE message which
282 // is passed when the non-client area is being created and enables automatic
283 // non-client DPI scaling so that the non-client area automatically
284 // responsponds to changes in DPI. All other messages are handled by
285 // MessageHandler.
286 static LRESULT CALLBACK WndProc(HWND const window,
287 UINT const message,
288 WPARAM const wparam,
289 LPARAM const lparam) noexcept;
290
291 // WM_DPICHANGED_BEFOREPARENT defined in more recent Windows
292 // SDK
293 static const long kWmDpiChangedBeforeParent = 0x02E2;
294
295 // Timer identifier for DirectManipulation gesture polling.
296 static const int kDirectManipulationTimer = 1;
297
298 // Release OS resources associated with the window.
299 void Destroy();
300
301 // Registers a window class with default style attributes, cursor and
302 // icon.
303 WNDCLASS RegisterWindowClass(std::wstring& title);
304
305 // Retrieves a class instance pointer for |window|
306 static FlutterWindow* GetThisFromHandle(HWND const window) noexcept;
307
308 // Activates tracking for a "mouse leave" event.
309 void TrackMouseLeaveEvent(HWND hwnd);
310
311 // Stores new width and height and calls |OnResize| to notify inheritors
312 void HandleResize(UINT width, UINT height);
313
314 // Updates the cached scroll_offset_multiplier_ value based off OS settings.
315 void UpdateScrollOffsetMultiplier();
316
317 // Creates the ax_fragment_root_, alert_delegate_ and alert_node_ if they do
318 // not yet exist.
319 // Once set, they are not reset to nullptr.
320 void CreateAxFragmentRoot();
321
322 // A pointer to a FlutterWindowsView that can be used to update engine
323 // windowing and input state.
324 WindowBindingHandlerDelegate* binding_handler_delegate_;
325
326 // The last cursor set by Flutter. Defaults to the arrow cursor.
327 HCURSOR current_cursor_;
328
329 // The cursor rect set by Flutter.
330 RECT cursor_rect_;
331
332 // The window receives resize and focus messages before its view is set, so
333 // these values cache the state of the window in the meantime so that the
334 // proper application lifecycle state can be updated once the view is set.
335 bool restored_ = false;
336 bool focused_ = false;
337
338 int current_dpi_ = 0;
339 int current_width_ = 0;
340 int current_height_ = 0;
341
342 // Holds the conversion factor from lines scrolled to pixels scrolled.
343 float scroll_offset_multiplier_;
344
345 // Member variable to hold window handle.
346 HWND window_handle_ = nullptr;
347
348 // Member variable to hold the window title.
349 std::wstring window_class_name_;
350
351 // Set to true to be notified when the mouse leaves the window.
352 bool tracking_mouse_leave_ = false;
353
354 // Keeps track of the last key code produced by a WM_KEYDOWN or WM_SYSKEYDOWN
355 // message.
356 int keycode_for_char_message_ = 0;
357
358 // Keeps track of the last mouse coordinates by a WM_MOUSEMOVE message.
359 double mouse_x_ = 0;
360 double mouse_y_ = 0;
361
362 // Generates touch point IDs for touch events.
363 SequentialIdGenerator touch_id_generator_;
364
365 // Abstracts Windows APIs that may not be available on all supported versions
366 // of Windows.
367 std::shared_ptr<WindowsProcTable> windows_proc_table_;
368
369 // Manages IME state.
370 std::unique_ptr<TextInputManager> text_input_manager_;
371
372 // Manages IME state.
373 std::unique_ptr<KeyboardManager> keyboard_manager_;
374
375 // Used for temporarily storing the WM_TOUCH-provided touch points.
376 std::vector<TOUCHINPUT> touch_points_;
377
378 // Implements IRawElementProviderFragmentRoot when UIA is enabled.
379 std::unique_ptr<ui::AXFragmentRootWin> ax_fragment_root_;
380
381 // Allow WindowAXFragmentRootDelegate to access protected method.
382 friend class WindowAXFragmentRootDelegate;
383
384 FML_DISALLOW_COPY_AND_ASSIGN(FlutterWindow);
385 };
386
387 } // namespace flutter
388
389 #endif // FLUTTER_SHELL_PLATFORM_WINDOWS_FLUTTER_WINDOW_H_
flutter::AlertPlatformNodeDelegate
Definition: alert_platform_node_delegate.h:18
flutter::WindowStateEvent
WindowStateEvent
An event representing a change in window state that may update the.
Definition: windows_lifecycle_manager.h:24
direct_manipulation.h
flutter::FlutterWindow::GetWindowHandle
virtual HWND GetWindowHandle() override
Definition: flutter_window.cc:456
alert_platform_node_delegate.h
flutter::FlutterWindow::GetCurrentHeight
UINT GetCurrentHeight()
Definition: flutter_window.cc:914
flutter::FlutterWindow::OnComposeBegin
virtual void OnComposeBegin()
Definition: flutter_window.cc:265
scancode
int scancode
Definition: keyboard_key_handler_unittests.cc:115
flutter::FlutterWindow::GetDpiScale
virtual float GetDpiScale() override
Definition: flutter_window.cc:167
windows_lifecycle_manager.h
geometry.h
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bool was_down
Definition: keyboard_key_handler_unittests.cc:119
extended
bool extended
Definition: keyboard_key_handler_unittests.cc:118
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virtual UINT Win32DispatchMessage(UINT Msg, WPARAM wParam, LPARAM lParam) override
Definition: flutter_window.cc:472
flutter::FlutterWindow::OnThemeChange
virtual void OnThemeChange()
Definition: flutter_window.cc:344
windowsx_shim.h
flutter::FlutterWindow::OnPointerDown
virtual void OnPointerDown(double x, double y, FlutterPointerDeviceKind device_kind, int32_t device_id, UINT button)
Definition: flutter_window.cc:213
flutter::FlutterWindow::OnCursorRectUpdated
virtual void OnCursorRectUpdated(const Rect &rect) override
Definition: flutter_window.cc:299
character
char32_t character
Definition: keyboard_key_handler_unittests.cc:117
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std::function< void(bool)> KeyEventCallback
Definition: keyboard_manager.h:54
flutter::FlutterWindow::FlutterWindow
FlutterWindow(int width, int height, std::shared_ptr< WindowsProcTable > windows_proc_table=nullptr, std::unique_ptr< TextInputManager > text_input_manager=nullptr)
Definition: flutter_window.cc:119
flutter::FlutterWindow::GetCurrentWidth
UINT GetCurrentWidth()
Definition: flutter_window.cc:910
flutter::FlutterWindow::NarrowToWide
std::wstring NarrowToWide(const char *source)
Definition: flutter_window.cc:478
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virtual void OnImeEndComposition(UINT const message, WPARAM const wparam, LPARAM const lparam)
Definition: flutter_window.cc:883
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Definition: keyboard_manager.h:52
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Definition: window_binding_handler_delegate.h:18
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virtual LRESULT OnGetObject(UINT const message, WPARAM const wparam, LPARAM const lparam)
Definition: flutter_window.cc:777
flutter::FlutterWindow::InitializeChild
void InitializeChild(const char *title, unsigned int width, unsigned int height)
Definition: flutter_window.cc:421
flutter::Rect
Definition: geometry.h:56
flutter::FlutterWindow::AbortImeComposing
virtual void AbortImeComposing()
Definition: flutter_window.cc:898
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Definition: window_binding_handler.h:27
flutter::PointerLocation
Definition: window_binding_handler.h:34
text_input_manager.h
flutter::FlutterWindow::OnBitmapSurfaceUpdated
virtual bool OnBitmapSurfaceUpdated(const void *allocation, size_t row_bytes, size_t height) override
Definition: flutter_window.cc:311
flutter::FlutterWindow::OnPointerMove
virtual void OnPointerMove(double x, double y, FlutterPointerDeviceKind device_kind, int32_t device_id, int modifiers_state)
Definition: flutter_window.cc:204
flutter::FlutterWindow::GetAxFragmentRootDelegate
virtual ui::AXFragmentRootDelegateWin * GetAxFragmentRootDelegate()
Definition: flutter_window.cc:348
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virtual void OnText(const std::u16string &text) override
Definition: flutter_window.cc:250
flutter::FlutterWindow::GetAlert
virtual ui::AXPlatformNodeWin * GetAlert() override
Definition: flutter_window.cc:357
windows_proc_table.h
flutter::FlutterWindow::WindowAXFragmentRootDelegate
friend class WindowAXFragmentRootDelegate
Definition: flutter_window.h:382
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std::unique_ptr< DirectManipulationOwner > direct_manipulation_owner_
Definition: flutter_window.h:278
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virtual BOOL Win32PeekMessage(LPMSG lpMsg, UINT wMsgFilterMin, UINT wMsgFilterMax, UINT wRemoveMsg) override
Definition: flutter_window.cc:460
flutter::FlutterWindow::OnPointerLeave
virtual void OnPointerLeave(double x, double y, FlutterPointerDeviceKind device_kind, int32_t device_id)
Definition: flutter_window.cc:239
flutter::FlutterWindow::GetCurrentDPI
UINT GetCurrentDPI()
Definition: flutter_window.cc:906
flutter::FlutterWindow::OnUpdateSemanticsEnabled
virtual void OnUpdateSemanticsEnabled(bool enabled)
Definition: flutter_window.cc:282
flutter::FlutterWindow::OnPointerUp
virtual void OnPointerUp(double x, double y, FlutterPointerDeviceKind device_kind, int32_t device_id, UINT button)
Definition: flutter_window.cc:226
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virtual gfx::NativeViewAccessible GetNativeViewAccessible()
Definition: flutter_window.cc:329
flutter::FlutterWindow::UpdateFlutterCursor
virtual void UpdateFlutterCursor(const std::string &cursor_name) override
Definition: flutter_window.cc:179
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virtual void OnImeSetContext(UINT const message, WPARAM const wparam, LPARAM const lparam)
Definition: flutter_window.cc:833
flutter_windows_view.h
text
std::u16string text
Definition: keyboard_unittests.cc:332
flutter::FlutterWindow::SetFlutterCursor
virtual void SetFlutterCursor(HCURSOR cursor) override
Definition: flutter_window.cc:183
flutter::FlutterWindow::~FlutterWindow
virtual ~FlutterWindow()
Definition: flutter_window.cc:151
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virtual void SetView(WindowBindingHandlerDelegate *view) override
Definition: flutter_window.cc:156
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virtual PointerLocation GetPrimaryPointerLocation() override
Definition: flutter_window.cc:337
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virtual void OnComposeChange(const std::u16string &text, int cursor_pos)
Definition: flutter_window.cc:277
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virtual void OnImeStartComposition(UINT const message, WPARAM const wparam, LPARAM const lparam)
Definition: flutter_window.cc:841
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virtual void OnPaint()
Definition: flutter_window.cc:198
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Definition: flutter_window.cc:246
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virtual void OnResetImeComposing() override
Definition: flutter_window.cc:307
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virtual void OnWindowStateEvent(WindowStateEvent event)
Definition: flutter_window.cc:362
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virtual void OnKey(int key, int scancode, int action, char32_t character, bool extended, bool was_down, KeyEventCallback callback) override
Definition: flutter_window.cc:254
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Definition: accessibility_bridge_windows.cc:11
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virtual void OnResize(unsigned int width, unsigned int height)
Definition: flutter_window.cc:192
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virtual uint32_t Win32MapVkToChar(uint32_t virtual_key) override
Definition: flutter_window.cc:468
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virtual AlertPlatformNodeDelegate * GetAlertDelegate() override
Definition: flutter_window.cc:352
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Definition: flutter_window.cc:269
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LRESULT HandleMessage(UINT const message, WPARAM const wparam, LPARAM const lparam) noexcept
Definition: flutter_window.cc:525
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std::unique_ptr< ui::AXPlatformNodeWin > alert_node_
Definition: flutter_window.h:274
flutter::FlutterWindow::OnImeRequest
virtual void OnImeRequest(UINT const message, WPARAM const wparam, LPARAM const lparam)
Definition: flutter_window.cc:890
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virtual float GetScrollOffsetMultiplier()
Definition: flutter_window.cc:918
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Definition: sequential_id_generator.h:20
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virtual LRESULT Win32DefWindowProc(HWND hWnd, UINT Msg, WPARAM wParam, LPARAM lParam)
Definition: flutter_window.cc:922
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virtual void OnScroll(double delta_x, double delta_y, FlutterPointerDeviceKind device_kind, int32_t device_id)
Definition: flutter_window.cc:286
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virtual void OnImeComposition(UINT const message, WPARAM const wparam, LPARAM const lparam)
Definition: flutter_window.cc:848
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virtual void OnComposeEnd()
Definition: flutter_window.cc:273
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virtual PhysicalWindowBounds GetPhysicalWindowBounds() override
Definition: flutter_window.cc:175
flutter::WindowBindingHandler
Definition: window_binding_handler.h:40
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Definition: keyboard_unittests.cc:137
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int action
Definition: keyboard_key_handler_unittests.cc:116
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Definition: flutter_window.h:35
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Definition: flutter_window.h:271
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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 OnDpiScale(unsigned int dpi)
Definition: flutter_window.cc:188
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