1 // Copyright (c) 2012 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_AURA_WINDOW_TRACKER_H_ 6 #define UI_AURA_WINDOW_TRACKER_H_ 7 8 #include <set> 9 10 #include "base/basictypes.h" 11 #include "base/compiler_specific.h" 12 #include "ui/aura/aura_export.h" 13 #include "ui/aura/window_observer.h" 14 15 namespace aura { 16 17 // This class keeps track of a set of windows. A Window is removed either 18 // explicitly by Remove(), or implicitly when the window is destroyed. 19 class AURA_EXPORT WindowTracker : public WindowObserver { 20 public: 21 typedef std::set<Window*> Windows; 22 23 WindowTracker(); 24 virtual ~WindowTracker(); 25 26 // Returns the set of windows being observed. 27 const std::set<Window*>& windows() const { return windows_; } 28 29 // Adds |window| to the set of Windows being tracked. 30 void Add(Window* window); 31 32 // Removes |window| from the set of windows being tracked. 33 void Remove(Window* window); 34 35 // Returns true if |window| was previously added and has not been removed or 36 // deleted. 37 bool Contains(Window* window); 38 39 // WindowObserver overrides: 40 virtual void OnWindowDestroying(Window* window) OVERRIDE; 41 42 private: 43 Windows windows_; 44 45 DISALLOW_COPY_AND_ASSIGN(WindowTracker); 46 }; 47 48 } // namespace aura 49 50 #endif // UI_AURA_WINDOW_TRACKER_H_ 51
