ui/views/widget/widget_deletion_observer.h

   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/widget/widget_observer.h"
  11
  12 namespace views {
  13 class Widget;
  14
  15 // A simple WidgetObserver that can be probed for the life of a widget.
  16 class WidgetDeletionObserver : public WidgetObserver {
  17  public:
  18   explicit WidgetDeletionObserver(Widget* widget);
  19   virtual ~WidgetDeletionObserver();
  20
  21   // Returns true if the widget passed in the constructor is still alive.
  22   bool IsWidgetAlive() { return widget_ != NULL; }
  23
  24   // Overridden from WidgetObserver.
  25   virtual void OnWidgetDestroying(Widget* widget) OVERRIDE;
  26
  27  private:
  28   void CleanupWidget();
  29
  30   Widget* widget_;
  31
  32   DISALLOW_COPY_AND_ASSIGN(WidgetDeletionObserver);
  33 };
  34
  35 }  // namespace views
  36
  37 #endif  // UI_VIEWS_WIDGET_WIDGET_DELETION_OBSERVER_H_