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 ASH_WM_WINDOW_CYCLE_LIST_H_ 6 #define ASH_WM_WINDOW_CYCLE_LIST_H_ 7 8 #include <vector> 9 10 #include "ash/ash_export.h" 11 #include "base/basictypes.h" 12 #include "base/compiler_specific.h" 13 #include "ui/aura/window_observer.h" 14 15 namespace ash { 16 17 // Tracks a set of Windows that can be stepped through. This class is used by 18 // the WindowCycleController. 19 class ASH_EXPORT WindowCycleList : public aura::WindowObserver { 20 public: 21 typedef std::vector<aura::Window*> WindowList; 22 23 enum Direction { 24 FORWARD, 25 BACKWARD 26 }; 27 28 explicit WindowCycleList(const WindowList& windows); 29 virtual ~WindowCycleList(); 30 31 bool empty() const { return windows_.empty(); } 32 33 // Cycles to the next or previous window based on |direction|. 34 void Step(Direction direction); 35 36 const WindowList& windows() const { return windows_; } 37 38 private: 39 // Returns the index of |window| in |windows_| or -1 if it isn't there. 40 int GetWindowIndex(aura::Window* window); 41 42 // aura::WindowObserver overrides: 43 virtual void OnWindowDestroyed(aura::Window* window) OVERRIDE; 44 45 // List of weak pointers to windows to use while cycling with the keyboard. 46 // List is built when the user initiates the gesture (e.g. hits alt-tab the 47 // first time) and is emptied when the gesture is complete (e.g. releases the 48 // alt key). 49 WindowList windows_; 50 51 // Current position in the |windows_| list or -1 if we're not cycling. 52 int current_index_; 53 54 DISALLOW_COPY_AND_ASSIGN(WindowCycleList); 55 }; 56 57 } // namespace ash 58 59 #endif // ASH_WM_WINDOW_CYCLE_LIST_H_ 60
