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

content/browser/renderer_host/render_widget_host_view_win.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_WIN_H_
 #define CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_WIN_H_
 #pragma once
 
 #include <atlbase.h>
 #include <atlapp.h>
 #include <atlcrack.h>
 #include <atlmisc.h>
 
 #include <vector>
 
 #include "base/compiler_specific.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/scoped_vector.h"
 #include "base/task.h"
 #include "base/win/scoped_comptr.h"
 #include "content/browser/accessibility/browser_accessibility_manager.h"
 #include "content/browser/renderer_host/render_widget_host_view.h"
 #include "content/common/content_export.h"
 #include "content/common/notification_observer.h"
 #include "content/common/notification_registrar.h"
 #include "ui/base/win/ime_input.h"
 #include "ui/gfx/native_widget_types.h"
+#include "ui/gfx/point.h"
 #include "webkit/glue/webcursor.h"
 
 class BackingStore;
 class RenderWidgetHost;
 
 namespace gfx {
 class Size;
 class Rect;
 }
 
@@ skipping 135 matching lines @@
       const WebKit::WebMouseWheelEvent& event) OVERRIDE;
   virtual void SetHasHorizontalScrollbar(
       bool has_horizontal_scrollbar) OVERRIDE;
   virtual void SetScrollOffsetPinning(
       bool is_pinned_to_left, bool is_pinned_to_right) OVERRIDE;
   virtual gfx::PluginWindowHandle GetCompositingSurface() OVERRIDE;
   virtual void ShowCompositorHostWindow(bool show) OVERRIDE;
   virtual void OnAccessibilityNotifications(
       const std::vector<ViewHostMsg_AccessibilityNotification_Params>& params
       ) OVERRIDE;
+  virtual bool LockMouse() OVERRIDE;
+  virtual void UnlockMouse() OVERRIDE;
 
   // Implementation of NotificationObserver:
   virtual void Observe(int type,
                        const NotificationSource& source,
                        const NotificationDetails& details) OVERRIDE;
 
   // Implementation of BrowserAccessibilityDelegate:
   virtual void SetAccessibilityFocus(int acc_obj_id) OVERRIDE;
   virtual void AccessibilityDoDefaultAction(int acc_obj_id) OVERRIDE;
 
@@ skipping 90 matching lines @@
   void CleanupCompositorWindow();
 
   // Whether the window should be activated.
   bool IsActivatable() const;
 
   // Do initialization needed by both InitAsPopup() and InitAsFullscreen().
   void DoPopupOrFullscreenInit(HWND parent_hwnd,
                                const gfx::Rect& pos,
                                DWORD ex_style);
 
+  CPoint GetClientCenter() const;
+  void MoveCursorToCenter() const;
+
+  void HandleLockedMouseEvent(UINT message, WPARAM wparam, LPARAM lparam);
+
   // The associated Model.  While |this| is being Destroyed,
   // |render_widget_host_| is NULL and the Windows message loop is run one last
   // time. Message handlers must check for a NULL |render_widget_host_|.
   RenderWidgetHost* render_widget_host_;
 
   // When we are doing accelerated compositing
   HWND compositor_host_window_;
 
   // true if the compositor host window must be hidden after the
   // software renderered view is updated.
@@ skipping 75 matching lines @@
 
   // Stores the current text input type received by ImeUpdateTextInputState()
   // method.
   ui::TextInputType text_input_type_;
 
   ScopedVector<ui::ViewProp> props_;
 
   // Is the widget fullscreen?
   bool is_fullscreen_;
 
+  // Used to record the last position of the mouse.
+  // While the mouse is locked, they store the last known position just as mouse
+  // lock was entered.
+  // Relative to the upper-left corner of the view.
+  gfx::Point last_mouse_position_;
+  // Relative to the upper-left corner of the screen.
+  gfx::Point last_global_mouse_position_;
+
+  // In the case of the mouse being moved away from the view and then moved
+  // back, we regard the mouse movement as (0, 0).
+  bool ignore_mouse_movement_;
+
   DISALLOW_COPY_AND_ASSIGN(RenderWidgetHostViewWin);
 };
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_WIN_H_