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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 PhysicalWindowBounds GetPhysicalWindowBounds() override;
163
164 // |FlutterWindowBindingHandler|
165 virtual void UpdateFlutterCursor(const std::string& cursor_name) override;
166
167 // |FlutterWindowBindingHandler|
168 virtual void SetFlutterCursor(HCURSOR cursor) override;
169
170 // |FlutterWindowBindingHandler|
171 virtual bool OnBitmapSurfaceCleared() 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 // Base constructor for mocks.
198 FlutterWindow();
199
200 // Win32's DefWindowProc.
201 //
202 // Used as the fallback behavior of HandleMessage. Exposed for dependency
203 // injection.
204 virtual LRESULT Win32DefWindowProc(HWND hWnd,
205 UINT Msg,
206 WPARAM wParam,
207 LPARAM lParam);
208
209 // Converts a c string to a wide unicode string.
210 std::wstring NarrowToWide(const char* source);
211
212 // Processes and route salient window messages for mouse handling,
213 // size change and DPI. Delegates handling of these to member overloads that
214 // inheriting classes can handle.
215 LRESULT HandleMessage(UINT const message,
216 WPARAM const wparam,
217 LPARAM const lparam) noexcept;
218
219 // Called when the OS requests a COM object.
220 //
221 // The primary use of this function is to supply Windows with wrapped
222 // semantics objects for use by Windows accessibility.
223 virtual LRESULT OnGetObject(UINT const message,
224 WPARAM const wparam,
225 LPARAM const lparam);
226
227 // Called when a window is activated in order to configure IME support for
228 // multi-step text input.
229 virtual void OnImeSetContext(UINT const message,
230 WPARAM const wparam,
231 LPARAM const lparam);
232
233 // Called when multi-step text input begins when using an IME.
234 virtual void OnImeStartComposition(UINT const message,
235 WPARAM const wparam,
236 LPARAM const lparam);
237
238 // Called when edits/commit of multi-step text input occurs when using an IME.
239 virtual void OnImeComposition(UINT const message,
240 WPARAM const wparam,
241 LPARAM const lparam);
242
243 // Called when multi-step text input ends when using an IME.
244 virtual void OnImeEndComposition(UINT const message,
245 WPARAM const wparam,
246 LPARAM const lparam);
247
248 // Called when the user triggers an IME-specific request such as input
249 // reconversion, where an existing input sequence is returned to composing
250 // mode to select an alternative candidate conversion.
251 virtual void OnImeRequest(UINT const message,
252 WPARAM const wparam,
253 LPARAM const lparam);
254
255 // Called when the app ends IME composing, such as when the text input client
256 // is cleared or changed.
257 virtual void AbortImeComposing();
258
259 // Called when the cursor rect has been updated.
260 //
261 // |rect| is in Win32 window coordinates.
262 virtual void UpdateCursorRect(const Rect& rect);
263
264 UINT GetCurrentDPI();
265
266 UINT GetCurrentWidth();
267
268 UINT GetCurrentHeight();
269
270 // Returns the current pixel per scroll tick value.
271 virtual float GetScrollOffsetMultiplier();
272
273 // Delegate to a alert_node_ used to set the announcement text.
274 std::unique_ptr<AlertPlatformNodeDelegate> alert_delegate_;
275
276 // Accessibility node that represents an alert.
277 std::unique_ptr<ui::AXPlatformNodeWin> alert_node_;
278
279 // Handles running DirectManipulation on the window to receive trackpad
280 // gestures.
281 std::unique_ptr<DirectManipulationOwner> direct_manipulation_owner_;
282
283 private:
284 // OS callback called by message pump. Handles the WM_NCCREATE message which
285 // is passed when the non-client area is being created and enables automatic
286 // non-client DPI scaling so that the non-client area automatically
287 // responsponds to changes in DPI. All other messages are handled by
288 // MessageHandler.
289 static LRESULT CALLBACK WndProc(HWND const window,
290 UINT const message,
291 WPARAM const wparam,
292 LPARAM const lparam) noexcept;
293
294 // WM_DPICHANGED_BEFOREPARENT defined in more recent Windows
295 // SDK
296 static const long kWmDpiChangedBeforeParent = 0x02E2;
297
298 // Timer identifier for DirectManipulation gesture polling.
299 static const int kDirectManipulationTimer = 1;
300
301 // Release OS resources associated with the window.
302 void Destroy();
303
304 // Registers a window class with default style attributes, cursor and
305 // icon.
306 WNDCLASS RegisterWindowClass(std::wstring& title);
307
308 // Retrieves a class instance pointer for |window|
309 static FlutterWindow* GetThisFromHandle(HWND const window) noexcept;
310
311 // Activates tracking for a "mouse leave" event.
312 void TrackMouseLeaveEvent(HWND hwnd);
313
314 // Stores new width and height and calls |OnResize| to notify inheritors
315 void HandleResize(UINT width, UINT height);
316
317 // Updates the cached scroll_offset_multiplier_ value based off OS settings.
318 void UpdateScrollOffsetMultiplier();
319
320 // Creates the ax_fragment_root_, alert_delegate_ and alert_node_ if they do
321 // not yet exist.
322 // Once set, they are not reset to nullptr.
323 void CreateAxFragmentRoot();
324
325 // A pointer to a FlutterWindowsView that can be used to update engine
326 // windowing and input state.
327 WindowBindingHandlerDelegate* binding_handler_delegate_ = nullptr;
328
329 // The last cursor set by Flutter. Defaults to the arrow cursor.
330 HCURSOR current_cursor_;
331
332 // The cursor rect set by Flutter.
333 RECT cursor_rect_;
334
335 // The window receives resize and focus messages before its view is set, so
336 // these values cache the state of the window in the meantime so that the
337 // proper application lifecycle state can be updated once the view is set.
338 bool restored_ = false;
339 bool focused_ = false;
340
341 int current_dpi_ = 0;
342 int current_width_ = 0;
343 int current_height_ = 0;
344
345 // Holds the conversion factor from lines scrolled to pixels scrolled.
346 float scroll_offset_multiplier_;
347
348 // Member variable to hold window handle.
349 HWND window_handle_ = nullptr;
350
351 // Member variable to hold the window title.
352 std::wstring window_class_name_;
353
354 // Set to true to be notified when the mouse leaves the window.
355 bool tracking_mouse_leave_ = false;
356
357 // Keeps track of the last key code produced by a WM_KEYDOWN or WM_SYSKEYDOWN
358 // message.
359 int keycode_for_char_message_ = 0;
360
361 // Keeps track of the last mouse coordinates by a WM_MOUSEMOVE message.
362 double mouse_x_ = 0;
363 double mouse_y_ = 0;
364
365 // Generates touch point IDs for touch events.
366 SequentialIdGenerator touch_id_generator_;
367
368 // Abstracts Windows APIs that may not be available on all supported versions
369 // of Windows.
370 std::shared_ptr<WindowsProcTable> windows_proc_table_;
371
372 // Manages IME state.
373 std::unique_ptr<TextInputManager> text_input_manager_;
374
375 // Manages IME state.
376 std::unique_ptr<KeyboardManager> keyboard_manager_;
377
378 // Used for temporarily storing the WM_TOUCH-provided touch points.
379 std::vector<TOUCHINPUT> touch_points_;
380
381 // Implements IRawElementProviderFragmentRoot when UIA is enabled.
382 std::unique_ptr<ui::AXFragmentRootWin> ax_fragment_root_;
383
384 // Allow WindowAXFragmentRootDelegate to access protected method.
385 friend class WindowAXFragmentRootDelegate;
386
387 FML_DISALLOW_COPY_AND_ASSIGN(FlutterWindow);
388 };
389
390 } // namespace flutter
391
392 #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:463
alert_platform_node_delegate.h
flutter::FlutterWindow::GetCurrentHeight
UINT GetCurrentHeight()
Definition: flutter_window.cc:921
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:171
windows_lifecycle_manager.h
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bool was_down
Definition: keyboard_key_handler_unittests.cc:119
extended
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Definition: keyboard_key_handler_unittests.cc:118
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virtual bool OnBitmapSurfaceCleared() override
Definition: flutter_window.cc:311
flutter::FlutterWindow::Win32DispatchMessage
virtual UINT Win32DispatchMessage(UINT Msg, WPARAM wParam, LPARAM lParam) override
Definition: flutter_window.cc:479
flutter::FlutterWindow::OnThemeChange
virtual void OnThemeChange()
Definition: flutter_window.cc:351
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::GetCurrentWidth
UINT GetCurrentWidth()
Definition: flutter_window.cc:917
flutter::FlutterWindow::NarrowToWide
std::wstring NarrowToWide(const char *source)
Definition: flutter_window.cc:485
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virtual void OnImeEndComposition(UINT const message, WPARAM const wparam, LPARAM const lparam)
Definition: flutter_window.cc:890
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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:784
flutter::FlutterWindow::InitializeChild
void InitializeChild(const char *title, unsigned int width, unsigned int height)
Definition: flutter_window.cc:428
flutter::Rect
Definition: geometry.h:56
flutter::FlutterWindow::AbortImeComposing
virtual void AbortImeComposing()
Definition: flutter_window.cc:905
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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:318
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:355
flutter::FlutterWindow::OnText
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:364
windows_proc_table.h
flutter::FlutterWindow::WindowAXFragmentRootDelegate
friend class WindowAXFragmentRootDelegate
Definition: flutter_window.h:385
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std::unique_ptr< DirectManipulationOwner > direct_manipulation_owner_
Definition: flutter_window.h:281
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virtual BOOL Win32PeekMessage(LPMSG lpMsg, UINT wMsgFilterMin, UINT wMsgFilterMax, UINT wRemoveMsg) override
Definition: flutter_window.cc:467
flutter::FlutterWindow::OnPointerLeave
virtual void OnPointerLeave(double x, double y, FlutterPointerDeviceKind device_kind, int32_t device_id)
Definition: flutter_window.cc:239
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UINT GetCurrentDPI()
Definition: flutter_window.cc:913
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:336
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:840
flutter_windows_view.h
text
std::u16string text
Definition: keyboard_unittests.cc:332
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virtual void SetFlutterCursor(HCURSOR cursor) override
Definition: flutter_window.cc:183
flutter::FlutterWindow::~FlutterWindow
virtual ~FlutterWindow()
Definition: flutter_window.cc:154
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virtual void SetView(WindowBindingHandlerDelegate *view) override
Definition: flutter_window.cc:158
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virtual PointerLocation GetPrimaryPointerLocation() override
Definition: flutter_window.cc:344
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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:848
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virtual void OnPaint()
Definition: flutter_window.cc:198
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virtual void OnSetCursor()
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:369
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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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Definition: flutter_window.cc:475
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virtual AlertPlatformNodeDelegate * GetAlertDelegate() override
Definition: flutter_window.cc:359
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Definition: flutter_window.cc:269
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Definition: flutter_window.cc:532
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Definition: flutter_window.h:277
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virtual void OnImeRequest(UINT const message, WPARAM const wparam, LPARAM const lparam)
Definition: flutter_window.cc:897
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Definition: flutter_window.cc:151
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virtual float GetScrollOffsetMultiplier()
Definition: flutter_window.cc:925
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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:929
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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
flutter::FlutterWindow::OnImeComposition
virtual void OnImeComposition(UINT const message, WPARAM const wparam, LPARAM const lparam)
Definition: flutter_window.cc:855
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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
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Definition: window_binding_handler.h:40
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Definition: keyboard_unittests.cc:137
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Definition: keyboard_key_handler_unittests.cc:116
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Definition: flutter_window.h:35
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std::unique_ptr< AlertPlatformNodeDelegate > alert_delegate_
Definition: flutter_window.h:274
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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
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Definition: flutter_windows_view_unittests.cc:52
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virtual void UpdateCursorRect(const Rect &rect)
Definition: flutter_window.cc:909