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 295 matching lines @@
   // fade effect, pass a NULL value for |color|. In this case, |animate| is
   // ignored.
   virtual void SetVisuallyDeemphasized(const SkColor* color, bool animate) = 0;
 
   virtual void UnhandledWheelEvent(const WebKit::WebMouseWheelEvent& event) = 0;
 
   virtual void SetHasHorizontalScrollbar(bool has_horizontal_scrollbar) = 0;
   virtual void SetScrollOffsetPinning(
       bool is_pinned_to_left, bool is_pinned_to_right) = 0;
 
+  // Return value indicates whether the mouse is locked successfully or not.
+  virtual bool LockMouse() = 0;
+  virtual void UnlockMouse() = 0;
+
   void set_popup_type(WebKit::WebPopupType popup_type) {
     popup_type_ = popup_type;
   }
   WebKit::WebPopupType popup_type() const { return popup_type_; }
 
   // Subclasses should override this method to do what is appropriate to set
   // the custom background for their platform.
   CONTENT_EXPORT virtual void SetBackground(const SkBitmap& background);
   const SkBitmap& background() const { return background_; }
 
   virtual void OnAccessibilityNotifications(
       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;
   }
 
+  bool mouse_locked() const { return mouse_locked_; }
+
  protected:
   // Interface class only, do not construct.
-  RenderWidgetHostView() : popup_type_(WebKit::WebPopupTypeNone) {}
+  RenderWidgetHostView() : popup_type_(WebKit::WebPopupTypeNone),

[brettw, 2011/09/20 05:02:41]

Would you mind fixing the style here and moving this to the .cc file since
you're touching it?

+                           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_