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      1 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #ifndef UI_VIEWS_WIDGET_WIDGET_DELETION_OBSERVER_H_
      6 #define UI_VIEWS_WIDGET_WIDGET_DELETION_OBSERVER_H_
      7 
      8 #include "base/basictypes.h"
      9 #include "base/compiler_specific.h"
     10 #include "ui/views/views_export.h"
     11 #include "ui/views/widget/widget_observer.h"
     12 
     13 namespace views {
     14 class Widget;
     15 
     16 // A simple WidgetObserver that can be probed for the life of a widget.
     17 class VIEWS_EXPORT WidgetDeletionObserver : public WidgetObserver {
     18  public:
     19   explicit WidgetDeletionObserver(Widget* widget);
     20   virtual ~WidgetDeletionObserver();
     21 
     22   // Returns true if the widget passed in the constructor is still alive.
     23   bool IsWidgetAlive() { return widget_ != NULL; }
     24 
     25   // Overridden from WidgetObserver.
     26   virtual void OnWidgetDestroying(Widget* widget) OVERRIDE;
     27 
     28  private:
     29   void CleanupWidget();
     30 
     31   Widget* widget_;
     32 
     33   DISALLOW_COPY_AND_ASSIGN(WidgetDeletionObserver);
     34 };
     35 
     36 }  // namespace views
     37 
     38 #endif  // UI_VIEWS_WIDGET_WIDGET_DELETION_OBSERVER_H_
     39