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

content/browser/renderer_host/render_widget_host_view.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_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_H_
 #define CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_H_
 #pragma once
 
 #if defined(OS_MACOSX)
 #include <OpenGL/OpenGL.h>
@@ skipping 311 matching lines @@
       const std::vector<ViewHostMsg_AccessibilityNotification_Params>& params) {
   }
 
   gfx::Rect reserved_contents_rect() const {
     return reserved_rect_;
   }
   void set_reserved_contents_rect(const gfx::Rect& reserved_rect) {
     reserved_rect_ = reserved_rect;
   }
 
+  virtual bool LockMouse();

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

These should probably be pure virtual and moved above with the other virtual
functions to match the existing style. Can you also add a comment here about
what the return value is?

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

Good idea, thanks!

On 2011/09/14 22:17:58, brettw wrote:

+  virtual void UnlockMouse();
+
+  bool mouse_locked() const { return mouse_locked_; }
+
  protected:
   // Interface class only, do not construct.
-  RenderWidgetHostView() : popup_type_(WebKit::WebPopupTypeNone) {}
+  RenderWidgetHostView() : popup_type_(WebKit::WebPopupTypeNone),
+                           mouse_locked_(false) {}
 
   // Whether this view is a popup and what kind of popup it is (select,
   // autofill...).
   WebKit::WebPopupType popup_type_;
 
   // A custom background to paint behind the web content. This will be tiled
   // horizontally. Can be null, in which case we fall back to painting white.
   SkBitmap background_;
 
   // The current reserved area in view coordinates where contents should not be
   // rendered to draw the resize corner, sidebar mini tabs etc.
   gfx::Rect reserved_rect_;
 
+  // While the mouse is locked, the cursor is hidden from the user. Mouse events
+  // are still generated. However, the position they report is the last known
+  // mouse position just as mouse lock was entered; the movement they report
+  // indicates what the change in position of the mouse would be had it not been
+  // locked.
+  bool mouse_locked_;
+
  private:
   DISALLOW_COPY_AND_ASSIGN(RenderWidgetHostView);
 };
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_H_