Mouse lock implementation, including the renderer side and the Windows version of the browser side.

content/renderer/render_widget.h

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_RENDERER_RENDER_WIDGET_H_
 #define CONTENT_RENDERER_RENDER_WIDGET_H_
 #pragma once
 
 #include <vector>
 
@@ skipping 24 matching lines @@
 
 namespace IPC {
 class SyncMessage;
 }
 
 namespace skia {
 class PlatformCanvas;
 }
 
 namespace WebKit {
+class WebInputEvent;
 class WebMouseEvent;
 class WebWidget;
 struct WebPopupMenuInfo;
 }
 
 namespace webkit {
 namespace npapi {
 struct WebPluginGeometry;
 }  // namespace npapi
 
@@ skipping 242 matching lines @@
   void SetPendingWindowRect(const WebKit::WebRect& r);
 
   // Called by OnHandleInputEvent() to notify subclasses that a key event was
   // just handled.
   virtual void DidHandleKeyEvent() {}
 
   // Called by OnHandleInputEvent() to notify subclasses that a mouse event was
   // just handled.
   virtual void DidHandleMouseEvent(const WebKit::WebMouseEvent& event) {}
 
+  // Called by OnHandleInputEvent() to notify subclasses that an mouse event is
+  // about to be handled.
+  // Returns true if no further handling is needed. In that case, the event
+  // won't be sent to WebKit or trigger DidHandleMouseEvent().
+  virtual bool BeforeHandleMouseEvent(const WebKit::WebMouseEvent& event) {

[brettw, 2011/09/14 22:17:58]

Can you implement this in the .cc file? I realize some of the other functions
aren't, but this will prevent virtual function bloat (it has to be inlined in
every file that includes it).

Can you also move this to before "DidHandleMouseEvent", and mention that
DidHandleMouseEvent will not be called if you return true.

[yzshen1, 2011/09/19 20:48:41]

Done. Thanks!

+    return false;
+  }
+
   // Routing ID that allows us to communicate to the parent browser process
   // RenderWidgetHost. When MSG_ROUTING_NONE, no messages may be sent.
   int32 routing_id_;
 
   // We are responsible for destroying this object via its Close method.
   WebKit::WebWidget* webwidget_;
 
   // Set to the ID of the view that initiated creating this view, if any. When
   // the view was initiated by the browser (the common case), this will be
   // MSG_ROUTING_NONE. This is used in determining ownership when opening
@@ skipping 121 matching lines @@
   bool animation_task_posted_;
   bool invalidation_task_posted_;
 
   bool has_disable_gpu_vsync_switch_;
   base::TimeTicks last_do_deferred_update_time_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderWidget);
 };
 
 #endif  // CONTENT_RENDERER_RENDER_WIDGET_H_