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31 #ifndef WebWidgetClient_h
32 #define WebWidgetClient_h
34 #include "WebNavigationPolicy.h"
35 #include "public/platform/WebCommon.h"
36 #include "public/platform/WebLayerTreeView.h"
37 #include "public/platform/WebRect.h"
38 #include "public/platform/WebScreenInfo.h"
39 #include "public/web/WebTouchAction.h"
43 class WebGestureEvent;
49 class WebWidgetClient {
51 // Called when a region of the WebWidget needs to be re-painted.
52 virtual void didInvalidateRect(const WebRect&) { }
54 // Called when the Widget has changed size as a result of an auto-resize.
55 virtual void didAutoResize(const WebSize& newSize) { }
57 // Attempt to initialize compositing for this widget. If this is successful,
58 // layerTreeView() will return a valid WebLayerTreeView.
59 virtual void initializeLayerTreeView() { }
61 // Return a compositing view used for this widget. This is owned by the
63 virtual WebLayerTreeView* layerTreeView() { return 0; }
64 // FIXME: Remove all overrides of this and change layerTreeView() above to ASSERT_NOT_REACHED.
65 virtual bool allowsBrokenNullLayerTreeView() const { return false; }
67 // Sometimes the WebWidget enters a state where it will generate a sequence
68 // of invalidations that should not, by themselves, trigger the compositor
69 // to schedule a new frame. This call indicates to the embedder that it
70 // should suppress compositor scheduling temporarily.
71 virtual void suppressCompositorScheduling(bool enable) { }
73 // Indicates to the embedder that the compositor is about to begin a
74 // frame. This is primarily to signal to flow control mechanisms that a
75 // frame is beginning, not to perform actual painting work.
76 virtual void willBeginCompositorFrame() { }
78 // Indicates to the embedder that the WebWidget is ready for additional
80 virtual void didBecomeReadyForAdditionalInput() { }
82 // Called for compositing mode when a frame commit operation has finished.
83 virtual void didCommitCompositorFrame() { }
85 // Called for compositing mode when the draw commands for a WebKit-side
86 // frame have been issued.
87 virtual void didCommitAndDrawCompositorFrame() { }
89 // Called for compositing mode when swapbuffers has been posted in the GPU
91 virtual void didCompleteSwapBuffers() { }
93 // Called when a call to WebWidget::animate is required
94 virtual void scheduleAnimation() { }
96 // Called when the widget acquires or loses focus, respectively.
97 virtual void didFocus() { }
98 virtual void didBlur() { }
100 // Called when the cursor for the widget changes.
101 virtual void didChangeCursor(const WebCursorInfo&) { }
103 // Called when the widget should be closed. WebWidget::close() should
104 // be called asynchronously as a result of this notification.
105 virtual void closeWidgetSoon() { }
107 // Called to show the widget according to the given policy.
108 virtual void show(WebNavigationPolicy) { }
110 // Called to block execution of the current thread until the widget is
112 virtual void runModal() { }
114 // Called to enter/exit fullscreen mode. If enterFullScreen returns true,
115 // then WebWidget::{will,Did}EnterFullScreen should bound resizing the
116 // WebWidget into fullscreen mode. Similarly, when exitFullScreen is
117 // called, WebWidget::{will,Did}ExitFullScreen should bound resizing the
118 // WebWidget out of fullscreen mode.
119 virtual bool enterFullScreen() { return false; }
120 virtual void exitFullScreen() { }
122 // Called to get/set the position of the widget in screen coordinates.
123 virtual WebRect windowRect() { return WebRect(); }
124 virtual void setWindowRect(const WebRect&) { }
126 // Called when a tooltip should be shown at the current cursor position.
127 virtual void setToolTipText(const WebString&, WebTextDirection hint) { }
129 // Called to get the position of the resizer rect in window coordinates.
130 virtual WebRect windowResizerRect() { return WebRect(); }
132 // Called to get the position of the root window containing the widget
133 // in screen coordinates.
134 virtual WebRect rootWindowRect() { return WebRect(); }
136 // Called to query information about the screen where this widget is
138 virtual WebScreenInfo screenInfo() { return WebScreenInfo(); }
140 // Called to get the scale factor of the display.
141 virtual float deviceScaleFactor() { return 1; }
143 // When this method gets called, WebWidgetClient implementation should
144 // reset the input method by cancelling any ongoing composition.
145 virtual void resetInputMethod() { }
147 // Requests to lock the mouse cursor. If true is returned, the success
148 // result will be asynchronously returned via a single call to
149 // WebWidget::didAcquirePointerLock() or
150 // WebWidget::didNotAcquirePointerLock().
151 // If false, the request has been denied synchronously.
152 virtual bool requestPointerLock() { return false; }
154 // Cause the pointer lock to be released. This may be called at any time,
155 // including when a lock is pending but not yet acquired.
156 // WebWidget::didLosePointerLock() is called when unlock is complete.
157 virtual void requestPointerUnlock() { }
159 // Returns true iff the pointer is locked to this widget.
160 virtual bool isPointerLocked() { return false; }
162 // Called when a gesture event is handled.
163 virtual void didHandleGestureEvent(const WebGestureEvent& event, bool eventCancelled) { }
165 // Called to update if touch events should be sent.
166 virtual void hasTouchEventHandlers(bool) { }
168 // Called during WebWidget::HandleInputEvent for a TouchStart event to inform the embedder
169 // of the touch actions that are permitted for this touch.
170 virtual void setTouchAction(WebTouchAction touchAction) { }
172 // Called when value of focused text field gets dirty, e.g. value is
173 // modified by script, not by user input.
174 virtual void didUpdateTextOfFocusedElementByNonUserInput() { }
176 // Request the browser to show the IME for current input type.
177 virtual void showImeIfNeeded() { }
180 ~WebWidgetClient() { }