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// Copyright (c) 2012 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_TRACKER_H_
#define UI_AURA_WINDOW_TRACKER_H_
#include <set>
#include "base/basictypes.h"
#include "base/compiler_specific.h"
#include "ui/aura/aura_export.h"
#include "ui/aura/window_observer.h"
namespace aura {
// This class keeps track of a set of windows. A Window is removed either
// explicitly by Remove(), or implicitly when the window is destroyed.
class AURA_EXPORT WindowTracker : public WindowObserver {
public:
typedef std::set<Window*> Windows;
WindowTracker();
~WindowTracker() override;
// Returns the set of windows being observed.
const std::set<Window*>& windows() const { return windows_; }
// Adds |window| to the set of Windows being tracked.
void Add(Window* window);
// Removes |window| from the set of windows being tracked.
void Remove(Window* window);
// Returns true if |window| was previously added and has not been removed or
// deleted.
bool Contains(Window* window);
// WindowObserver overrides:
void OnWindowDestroying(Window* window) override;
private:
Windows windows_;
DISALLOW_COPY_AND_ASSIGN(WindowTracker);
};
} // namespace aura
#endif // UI_AURA_WINDOW_TRACKER_H_
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