views: Extract Widget observer into its own header file.

chrome/browser/ui/views/location_bar/page_action_image_view.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_LOCATION_BAR_PAGE_ACTION_IMAGE_VIEW_H_
 #define CHROME_BROWSER_UI_VIEWS_LOCATION_BAR_PAGE_ACTION_IMAGE_VIEW_H_
 
 #include <map>
 #include <string>
 
 #include "base/memory/scoped_ptr.h"
 #include "chrome/browser/extensions/image_loading_tracker.h"
 #include "chrome/browser/ui/views/extensions/extension_popup.h"
 #include "chrome/common/extensions/extension_action.h"
 #include "ui/views/context_menu_controller.h"
 #include "ui/views/controls/image_view.h"
+#include "ui/views/widget/widget_observer.h"
 
 class Browser;
 class LocationBarView;
 
 namespace content {
 class WebContents;
 }
 namespace views {
 class MenuRunner;
 }
 
 // PageActionImageView is used by the LocationBarView to display the icon for a
 // given PageAction and notify the extension when the icon is clicked.
 class PageActionImageView : public views::ImageView,
                             public ImageLoadingTracker::Observer,
-                            public views::Widget::Observer,
+                            public views::WidgetObserver,
                             public views::ContextMenuController,
                             public content::NotificationObserver,
                             public ExtensionAction::IconAnimation::Observer {
  public:
   PageActionImageView(LocationBarView* owner,
                       ExtensionAction* page_action,
                       Browser* browser);
   virtual ~PageActionImageView();
 
   ExtensionAction* page_action() { return page_action_; }
 
   int current_tab_id() { return current_tab_id_; }
 
   void set_preview_enabled(bool preview_enabled) {
     preview_enabled_ = preview_enabled;
   }
 
-  // Overridden from view.
+  // Overridden from views::View:
   virtual void GetAccessibleState(ui::AccessibleViewState* state) OVERRIDE;
   virtual bool OnMousePressed(const views::MouseEvent& event) OVERRIDE;
   virtual void OnMouseReleased(const views::MouseEvent& event) OVERRIDE;
   virtual bool OnKeyPressed(const views::KeyEvent& event) OVERRIDE;
 
-  // Overridden from ImageLoadingTracker.
+  // Overridden from ImageLoadingTracker:
   virtual void OnImageLoaded(const gfx::Image& image,
                              const std::string& extension_id,
                              int index) OVERRIDE;
 
-  // Overridden from views::Widget::Observer
+  // Overridden from views::WidgetObserver:
   virtual void OnWidgetClosing(views::Widget* widget) OVERRIDE;
 
   // Overridden from views::ContextMenuController.
   virtual void ShowContextMenuForView(View* source,
                                       const gfx::Point& point) OVERRIDE;
 
-  // content::NotificationObserver implementation.
+  // Overridden from content::NotificationObserver:
   virtual void Observe(int type,
                        const content::NotificationSource& source,
                        const content::NotificationDetails& details) OVERRIDE;
 
-  // Overridden from ui::AcceleratorTarget.
+  // Overridden from ui::AcceleratorTarget:
   virtual bool AcceleratorPressed(const ui::Accelerator& accelerator) OVERRIDE;
   virtual bool CanHandleAccelerators() const OVERRIDE;
 
   // Called to notify the PageAction that it should determine whether to be
   // visible or hidden. |contents| is the WebContents that is active, |url| is
   // the current page URL.
   void UpdateVisibility(content::WebContents* contents, const GURL& url);
 
   // Either notify listeners or show a popup depending on the page action.
   void ExecuteAction(int button);
 
  private:
-  // Overridden from ExtensionAction::IconAnimation::Observer.
+  // Overridden from ExtensionAction::IconAnimation::Observer:
   virtual void OnIconChanged(
       const ExtensionAction::IconAnimation& animation) OVERRIDE;
 
   // Shows the popup, with the given URL.
   void ShowPopupWithURL(const GURL& popup_url);
 
   // Hides the active popup, if there is one.
   void HidePopup();
 
   // The location bar view that owns us.
@@ skipping 35 matching lines @@
   scoped_ptr<views::MenuRunner> menu_runner_;
 
   // Fade-in animation for the icon with observer scoped to this.
   ExtensionAction::IconAnimation::ScopedObserver
       scoped_icon_animation_observer_;
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(PageActionImageView);
 };
 
 #endif  // CHROME_BROWSER_UI_VIEWS_LOCATION_BAR_PAGE_ACTION_IMAGE_VIEW_H_