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// Copyright 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef UI_AURA_WINDOW_DESTRUCTION_OBSERVER_H_
#define UI_AURA_WINDOW_DESTRUCTION_OBSERVER_H_
#include <set>
#include "ui/aura/aura_export.h"
#include "ui/aura/window.h"
#include "ui/aura/window_observer.h"
namespace aura {
// A class for observing window (self) destruction. A side effect of a
// window member funtion may be that the object, i.e. |this|, gets
// deleted. This class can be used to detect such cases and to exit
// the member function without any further access to member data. See
// for example: aura::Window::NotifyWindowVisibilityChangedAtReceiver.
class AURA_EXPORT WindowDestructionObserver : public WindowObserver {
public:
// Addes this observer to window.
explicit WindowDestructionObserver(aura::Window* window);
// Removes this observer from |window_| unless |window_| has been
// observed to be destroyed.
virtual ~WindowDestructionObserver();
// Returns true if |window_| has been observed to be destroyed.
bool destroyed() const { return destroyed_; }
private:
// aura::WindowObserver overrides:
virtual void OnWindowDestroyed(Window* window) OVERRIDE;
Window* window_;
bool destroyed_;
DISALLOW_COPY_AND_ASSIGN(WindowDestructionObserver);
};
} // namespace aura
#endif
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