views: Extract Widget observer into its own header file.

chrome/browser/ui/views/tabs/tab_drag_controller.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 CHROME_BROWSER_UI_VIEWS_TABS_TAB_DRAG_CONTROLLER_H_
 #define CHROME_BROWSER_UI_VIEWS_TABS_TAB_DRAG_CONTROLLER_H_
 
 #include <vector>
 
 #include "base/memory/scoped_ptr.h"
 #include "base/message_loop.h"
 #include "base/timer.h"
 #include "chrome/browser/ui/tab_contents/tab_contents.h"
 #include "chrome/browser/ui/tabs/dock_info.h"
 #include "chrome/browser/ui/tabs/tab_strip_model_observer.h"
 #include "chrome/browser/ui/tabs/tab_strip_selection_model.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 #include "content/public/browser/web_contents_delegate.h"
 #include "ui/gfx/rect.h"
-#include "ui/views/widget/widget.h"
+#include "ui/views/widget/widget_observer.h"
 
 namespace views {
 class View;
 }
 class BaseTab;
 class Browser;
 class DraggedTabView;
 struct TabRendererData;
 class TabStrip;
 class TabStripModel;
@@ skipping 11 matching lines @@
 // can happen (this state is referred to as detached):
 // . If |detach_into_browser_| is true then a new Browser is created and
 //   RunMoveLoop() is invoked on the Widget to drag the browser around. This is
 //   the default on chromeos and can be enabled on windows with a flag.
 // . If |detach_into_browser_| is false a small representation of the active tab
 //   is created and that is dragged around. This mode does not run a nested
 //   message loop.
 class TabDragController : public content::WebContentsDelegate,
                           public content::NotificationObserver,
                           public MessageLoopForUI::Observer,
-                          public views::Widget::Observer,
+                          public views::WidgetObserver,
                           public TabStripModelObserver {
  public:
   enum DetachBehavior {
     DETACHABLE,
     NOT_DETACHABLE
   };
 
   // What should happen as the mouse is dragged within the tabstrip.
   enum MoveBehavior {
     // Only the set of visible tabs should change. This is only applicable when
@@ skipping 156 matching lines @@
   // Overridden from content::NotificationObserver:
   virtual void Observe(int type,
                        const content::NotificationSource& source,
                        const content::NotificationDetails& details) OVERRIDE;
 
   // Overridden from MessageLoop::Observer:
   virtual base::EventStatus WillProcessEvent(
       const base::NativeEvent& event) OVERRIDE;
   virtual void DidProcessEvent(const base::NativeEvent& event) OVERRIDE;
 
-  // Overriden from views::Widget::Observer:
+  // Overriden from views::WidgetObserver:
   virtual void OnWidgetMoved(views::Widget* widget) OVERRIDE;
 
   // Overriden from TabStripModelObserver:
   virtual void TabStripEmpty() OVERRIDE;
 
   // Initialize the offset used to calculate the position to create windows
   // in |GetWindowCreatePoint|. This should only be invoked from |Init|.
   void InitWindowCreatePoint();
 
   // Returns the point where a detached window should be created given the
@@ skipping 326 matching lines @@
   // Non-null for the duration of RunMoveLoop.
   views::Widget* move_loop_widget_;
 
   // If non-null set to true from destructor.
   bool* destroyed_;
 
   DISALLOW_COPY_AND_ASSIGN(TabDragController);
 };
 
 #endif  // CHROME_BROWSER_UI_VIEWS_TABS_TAB_DRAG_CONTROLLER_H_