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/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   ~WidgetDeletionObserver() override;
  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   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_