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
13namespace views {
14class Widget;
15
16// A simple WidgetObserver that can be probed for the life of a widget.
17class 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