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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::unique_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 HWND GetWindowHandle();
54
55 // |KeyboardManager::WindowDelegate|
56 virtual BOOL Win32PeekMessage(LPMSG lpMsg,
57 UINT wMsgFilterMin,
58 UINT wMsgFilterMax,
59 UINT wRemoveMsg) override;
60
61 // |KeyboardManager::WindowDelegate|
62 virtual uint32_t Win32MapVkToChar(uint32_t virtual_key) override;
63
64 // |KeyboardManager::WindowDelegate|
65 virtual UINT Win32DispatchMessage(UINT Msg,
66 WPARAM wParam,
67 LPARAM lParam) override;
68
69 // Called when the DPI changes either when a
70 // user drags the window between monitors of differing DPI or when the user
71 // manually changes the scale factor.
72 virtual void OnDpiScale(unsigned int dpi);
73
74 // Called when a resize occurs.
75 virtual void OnResize(unsigned int width, unsigned int height);
76
77 // Called when a paint is requested.
78 virtual void OnPaint();
79
80 // Called when the pointer moves within the
81 // window bounds.
82 virtual void OnPointerMove(double x,
83 double y,
84 FlutterPointerDeviceKind device_kind,
85 int32_t device_id,
86 int modifiers_state);
87
88 // Called when the a mouse button, determined by |button|, goes down.
89 virtual void OnPointerDown(double x,
90 double y,
91 FlutterPointerDeviceKind device_kind,
92 int32_t device_id,
93 UINT button);
94
95 // Called when the a mouse button, determined by |button|, goes from
96 // down to up
97 virtual void OnPointerUp(double x,
98 double y,
99 FlutterPointerDeviceKind device_kind,
100 int32_t device_id,
101 UINT button);
102
103 // Called when the mouse leaves the window.
104 virtual void OnPointerLeave(double x,
105 double y,
106 FlutterPointerDeviceKind device_kind,
107 int32_t device_id);
108
109 // Called when the cursor should be set for the client area.
110 virtual void OnSetCursor();
111
112 // |WindowBindingHandlerDelegate|
113 virtual void OnText(const std::u16string& text) override;
114
115 // |WindowBindingHandlerDelegate|
116 virtual void OnKey(int key,
117 int scancode,
118 int action,
119 char32_t character,
120 bool extended,
121 bool was_down,
122 KeyEventCallback callback) override;
123
124 // Called when IME composing begins.
125 virtual void OnComposeBegin();
126
127 // Called when IME composing text is committed.
128 virtual void OnComposeCommit();
129
130 // Called when IME composing ends.
131 virtual void OnComposeEnd();
132
133 // Called when IME composing text or cursor position changes.
134 virtual void OnComposeChange(const std::u16string& text, int cursor_pos);
135
136 // |FlutterWindowBindingHandler|
137 virtual void OnCursorRectUpdated(const Rect& rect) override;
138
139 // |FlutterWindowBindingHandler|
140 virtual void OnResetImeComposing() override;
141
142 // Called when accessibility support is enabled or disabled.
143 virtual void OnUpdateSemanticsEnabled(bool enabled);
144
145 // Called when mouse scrollwheel input occurs.
146 virtual void OnScroll(double delta_x,
147 double delta_y,
148 FlutterPointerDeviceKind device_kind,
149 int32_t device_id);
150
151 // Returns the root view accessibility node, or nullptr if none.
152 virtual gfx::NativeViewAccessible GetNativeViewAccessible();
153
154 // |FlutterWindowBindingHandler|
155 virtual void SetView(WindowBindingHandlerDelegate* view) override;
156
157 // |FlutterWindowBindingHandler|
158 virtual WindowsRenderTarget GetRenderTarget() override;
159
160 // |FlutterWindowBindingHandler|
161 virtual PlatformWindow GetPlatformWindow() override;
162
163 // |FlutterWindowBindingHandler|
164 virtual float GetDpiScale() override;
165
166 // |FlutterWindowBindingHandler|
167 virtual bool IsVisible() override;
168
169 // |FlutterWindowBindingHandler|
170 virtual PhysicalWindowBounds GetPhysicalWindowBounds() override;
171
172 // |FlutterWindowBindingHandler|
173 virtual void UpdateFlutterCursor(const std::string& cursor_name) override;
174
175 // |FlutterWindowBindingHandler|
176 virtual void SetFlutterCursor(HCURSOR cursor) override;
177
178 // |FlutterWindowBindingHandler|
179 virtual void OnWindowResized() override;
180
181 // |FlutterWindowBindingHandler|
182 virtual bool OnBitmapSurfaceUpdated(const void* allocation,
183 size_t row_bytes,
184 size_t height) override;
185
186 // |FlutterWindowBindingHandler|
187 virtual PointerLocation GetPrimaryPointerLocation() override;
188
189 // Called when a theme change message is issued.
190 virtual void OnThemeChange();
191
192 // |WindowBindingHandler|
193 virtual void SendInitialAccessibilityFeatures() override;
194
195 // |WindowBindingHandler|
196 virtual AlertPlatformNodeDelegate* GetAlertDelegate() override;
197
198 // |WindowBindingHandler|
199 virtual ui::AXPlatformNodeWin* GetAlert() override;
200
201 // |WindowBindingHandler|
202 virtual bool NeedsVSync() override;
203
204 // Called to obtain a pointer to the fragment root delegate.
205 virtual ui::AXFragmentRootDelegateWin* GetAxFragmentRootDelegate();
206
207 // Called on a resize or focus event.
208 virtual void OnWindowStateEvent(WindowStateEvent event);
209
210 protected:
211 // Win32's DefWindowProc.
212 //
213 // Used as the fallback behavior of HandleMessage. Exposed for dependency
214 // injection.
215 virtual LRESULT Win32DefWindowProc(HWND hWnd,
216 UINT Msg,
217 WPARAM wParam,
218 LPARAM lParam);
219
220 // Converts a c string to a wide unicode string.
221 std::wstring NarrowToWide(const char* source);
222
223 // Processes and route salient window messages for mouse handling,
224 // size change and DPI. Delegates handling of these to member overloads that
225 // inheriting classes can handle.
226 LRESULT HandleMessage(UINT const message,
227 WPARAM const wparam,
228 LPARAM const lparam) noexcept;
229
230 // Called when the OS requests a COM object.
231 //
232 // The primary use of this function is to supply Windows with wrapped
233 // semantics objects for use by Windows accessibility.
234 virtual LRESULT OnGetObject(UINT const message,
235 WPARAM const wparam,
236 LPARAM const lparam);
237
238 // Called when a window is activated in order to configure IME support for
239 // multi-step text input.
240 virtual void OnImeSetContext(UINT const message,
241 WPARAM const wparam,
242 LPARAM const lparam);
243
244 // Called when multi-step text input begins when using an IME.
245 virtual void OnImeStartComposition(UINT const message,
246 WPARAM const wparam,
247 LPARAM const lparam);
248
249 // Called when edits/commit of multi-step text input occurs when using an IME.
250 virtual void OnImeComposition(UINT const message,
251 WPARAM const wparam,
252 LPARAM const lparam);
253
254 // Called when multi-step text input ends when using an IME.
255 virtual void OnImeEndComposition(UINT const message,
256 WPARAM const wparam,
257 LPARAM const lparam);
258
259 // Called when the user triggers an IME-specific request such as input
260 // reconversion, where an existing input sequence is returned to composing
261 // mode to select an alternative candidate conversion.
262 virtual void OnImeRequest(UINT const message,
263 WPARAM const wparam,
264 LPARAM const lparam);
265
266 // Called when the app ends IME composing, such as when the text input client
267 // is cleared or changed.
268 virtual void AbortImeComposing();
269
270 // Called when the cursor rect has been updated.
271 //
272 // |rect| is in Win32 window coordinates.
273 virtual void UpdateCursorRect(const Rect& rect);
274
275 UINT GetCurrentDPI();
276
277 UINT GetCurrentWidth();
278
279 UINT GetCurrentHeight();
280
281 // Returns the current pixel per scroll tick value.
282 virtual float GetScrollOffsetMultiplier();
283
284 // Check if the high contrast feature is enabled on the OS
285 virtual bool GetHighContrastEnabled();
286
287 // Delegate to a alert_node_ used to set the announcement text.
288 std::unique_ptr<AlertPlatformNodeDelegate> alert_delegate_;
289
290 // Accessibility node that represents an alert.
291 std::unique_ptr<ui::AXPlatformNodeWin> alert_node_;
292
293 // Handles running DirectManipulation on the window to receive trackpad
294 // gestures.
295 std::unique_ptr<DirectManipulationOwner> direct_manipulation_owner_;
296
297 private:
298 // OS callback called by message pump. Handles the WM_NCCREATE message which
299 // is passed when the non-client area is being created and enables automatic
300 // non-client DPI scaling so that the non-client area automatically
301 // responsponds to changes in DPI. All other messages are handled by
302 // MessageHandler.
303 static LRESULT CALLBACK WndProc(HWND const window,
304 UINT const message,
305 WPARAM const wparam,
306 LPARAM const lparam) noexcept;
307
308 // WM_DPICHANGED_BEFOREPARENT defined in more recent Windows
309 // SDK
310 static const long kWmDpiChangedBeforeParent = 0x02E2;
311
312 // Timer identifier for DirectManipulation gesture polling.
313 static const int kDirectManipulationTimer = 1;
314
315 // Release OS resources associated with the window.
316 void Destroy();
317
318 // Registers a window class with default style attributes, cursor and
319 // icon.
320 WNDCLASS RegisterWindowClass(std::wstring& title);
321
322 // Retrieves a class instance pointer for |window|
323 static FlutterWindow* GetThisFromHandle(HWND const window) noexcept;
324
325 // Activates tracking for a "mouse leave" event.
326 void TrackMouseLeaveEvent(HWND hwnd);
327
328 // Stores new width and height and calls |OnResize| to notify inheritors
329 void HandleResize(UINT width, UINT height);
330
331 // Updates the cached scroll_offset_multiplier_ value based off OS settings.
332 void UpdateScrollOffsetMultiplier();
333
334 // Creates the ax_fragment_root_, alert_delegate_ and alert_node_ if they do
335 // not yet exist.
336 // Once set, they are not reset to nullptr.
337 void CreateAxFragmentRoot();
338
339 // A pointer to a FlutterWindowsView that can be used to update engine
340 // windowing and input state.
341 WindowBindingHandlerDelegate* binding_handler_delegate_;
342
343 // The last cursor set by Flutter. Defaults to the arrow cursor.
344 HCURSOR current_cursor_;
345
346 // The cursor rect set by Flutter.
347 RECT cursor_rect_;
348
349 // The window receives resize and focus messages before its view is set, so
350 // these values cache the state of the window in the meantime so that the
351 // proper application lifecycle state can be updated once the view is set.
352 bool restored_ = false;
353 bool focused_ = false;
354
355 int current_dpi_ = 0;
356 int current_width_ = 0;
357 int current_height_ = 0;
358
359 // Holds the conversion factor from lines scrolled to pixels scrolled.
360 float scroll_offset_multiplier_;
361
362 // Member variable to hold window handle.
363 HWND window_handle_ = nullptr;
364
365 // Member variable to hold the window title.
366 std::wstring window_class_name_;
367
368 // Set to true to be notified when the mouse leaves the window.
369 bool tracking_mouse_leave_ = false;
370
371 // Keeps track of the last key code produced by a WM_KEYDOWN or WM_SYSKEYDOWN
372 // message.
373 int keycode_for_char_message_ = 0;
374
375 // Keeps track of the last mouse coordinates by a WM_MOUSEMOVE message.
376 double mouse_x_ = 0;
377 double mouse_y_ = 0;
378
379 // Generates touch point IDs for touch events.
380 SequentialIdGenerator touch_id_generator_;
381
382 // Abstracts Windows APIs that may not be available on all supported versions
383 // of Windows.
384 std::unique_ptr<WindowsProcTable> windows_proc_table_;
385
386 // Manages IME state.
387 std::unique_ptr<TextInputManager> text_input_manager_;
388
389 // Manages IME state.
390 std::unique_ptr<KeyboardManager> keyboard_manager_;
391
392 // Used for temporarily storing the WM_TOUCH-provided touch points.
393 std::vector<TOUCHINPUT> touch_points_;
394
395 // Implements IRawElementProviderFragmentRoot when UIA is enabled.
396 std::unique_ptr<ui::AXFragmentRootWin> ax_fragment_root_;
397
398 // Allow WindowAXFragmentRootDelegate to access protected method.
399 friend class WindowAXFragmentRootDelegate;
400
401 FML_DISALLOW_COPY_AND_ASSIGN(FlutterWindow);
402 };
403
404 } // namespace flutter
405
406 #endif // FLUTTER_SHELL_PLATFORM_WINDOWS_FLUTTER_WINDOW_H_
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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
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Definition: flutter_window.cc:175
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Definition: flutter_window.cc:358
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virtual LRESULT OnGetObject(UINT const message, WPARAM const wparam, LPARAM const lparam)
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Definition: geometry.h:56
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Definition: flutter_window.cc:376
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Definition: flutter_window.cc:491
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Definition: flutter_window.cc:937
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Definition: flutter_window.cc:296
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Definition: flutter_window.cc:268
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Definition: accessibility_bridge_windows.cc:11
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Definition: flutter_window.cc:499
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Definition: flutter_window.cc:371
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Definition: flutter_window.h:291
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Definition: flutter_window.cc:921
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Definition: sequential_id_generator.h:20
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Definition: flutter_window.cc:966
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Definition: flutter_window.cc:300
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Definition: flutter_window.cc:879
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Definition: flutter_window.cc:287
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Definition: flutter_window.cc:183
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Definition: window_binding_handler.h:47
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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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Definition: flutter_window.h:288
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Definition: flutter_window.cc:179
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Definition: keyboard_key_handler_unittests.cc:114
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Definition: flutter_window.cc:363
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Definition: flutter_window.cc:202
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Definition: flutter_windows_view_unittests.cc:46
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Definition: flutter_window.cc:933