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