Keep the mouse cursor within desktop

ui/aura/env.h

 // Copyright (c) 2012 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 UI_AURA_ENV_H_
 #define UI_AURA_ENV_H_
 #pragma once
 
 #include "base/memory/scoped_ptr.h"
 #include "base/message_loop.h"
 #include "base/observer_list.h"
 #include "ui/aura/aura_export.h"
 #include "ui/aura/client/stacking_client.h"
 
 namespace aura {
 
 class EnvObserver;
-class MonitorChangeObserverX11;
 class MonitorManager;
 class Window;
 
+namespace internal {
+class MonitorChangeObserverX11;
+}
+
 #if !defined(OS_MACOSX)
-class Dispatcher : public MessageLoop::Dispatcher {
- public:
-  virtual ~Dispatcher() {}
-};
-
 // Creates a platform-specific native event dispatcher.
-Dispatcher* CreateDispatcher();
+MessageLoop::Dispatcher* CreateDispatcher();
 #endif
 
 // A singleton object that tracks general state within Aura.
 // TODO(beng): manage RootWindows.
 class AURA_EXPORT Env {
  public:
   Env();
   ~Env();
 
   static Env* GetInstance();
   static void DeleteInstance();
 
   void AddObserver(EnvObserver* observer);
   void RemoveObserver(EnvObserver* observer);
 
   bool is_mouse_button_down() const { return mouse_button_flags_ != 0; }
   void set_mouse_button_flags(int mouse_button_flags) {
     mouse_button_flags_ = mouse_button_flags;
   }
 
   client::StackingClient* stacking_client() { return stacking_client_; }
   void set_stacking_client(client::StackingClient* stacking_client) {
     stacking_client_ = stacking_client;
   }
 
-#if defined(USE_X11)
-  MonitorChangeObserverX11* monitor_change_observer() {
-    return monitor_change_observer_.get();
-  }
-#endif
-
   // Gets/sets MonitorManager. The MonitorManager's ownership is
   // transfered.
   MonitorManager* monitor_manager() { return monitor_manager_.get(); }
   void SetMonitorManager(MonitorManager* monitor_manager);
 
   // Returns the native event dispatcher. The result should only be passed to
   // MessageLoopForUI::RunWithDispatcher() or
   // MessageLoopForUI::RunAllPendingWithDispatcher(), or used to dispatch
   // an event by |Dispatch(const NativeEvent&)| on it. It must never be stored.
 #if !defined(OS_MACOSX)
   MessageLoop::Dispatcher* GetDispatcher();
 #endif
 
  private:
   friend class Window;
 
+  void Init();
+
   // Called by the Window when it is initialized. Notifies observers.
   void NotifyWindowInitialized(Window* window);
 
   ObserverList<EnvObserver> observers_;
 #if !defined(OS_MACOSX)
-  scoped_ptr<Dispatcher> dispatcher_;
+  scoped_ptr<MessageLoop::Dispatcher> dispatcher_;
 #endif
 
   static Env* instance_;
   int mouse_button_flags_;
   client::StackingClient* stacking_client_;
   scoped_ptr<MonitorManager> monitor_manager_;
 
 #if defined(USE_X11)
-  scoped_ptr<MonitorChangeObserverX11> monitor_change_observer_;
+  scoped_ptr<internal::MonitorChangeObserverX11> monitor_change_observer_;
 #endif
 
   DISALLOW_COPY_AND_ASSIGN(Env);
 };
 
 }  // namespace aura
 
 #endif  // UI_AURA_ENV_H_