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| 1 // Copyright 2014 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_CONTROLLER_H_ |
| 6 #define ASH_WM_WINDOW_CYCLE_CONTROLLER_H_ |
| 7 |
| 8 #include "ash/ash_export.h" |
| 9 #include "base/basictypes.h" |
| 10 #include "base/memory/scoped_ptr.h" |
| 11 |
| 12 namespace ui { |
| 13 class EventHandler; |
| 14 } |
| 15 |
| 16 namespace ash { |
| 17 |
| 18 class WindowCycleList; |
| 19 |
| 20 // Controls cycling through windows with the keyboard via alt-tab. |
| 21 // Windows are sorted primarily by most recently used, and then by screen order. |
| 22 // We activate windows as you cycle through them, so the order on the screen |
| 23 // may change during the gesture, but the most recently used list isn't updated |
| 24 // until the cycling ends. Thus we maintain the state of the windows |
| 25 // at the beginning of the gesture so you can cycle through in a consistent |
| 26 // order. |
| 27 class ASH_EXPORT WindowCycleController { |
| 28 public: |
| 29 enum Direction { |
| 30 FORWARD, |
| 31 BACKWARD |
| 32 }; |
| 33 |
| 34 WindowCycleController(); |
| 35 virtual ~WindowCycleController(); |
| 36 |
| 37 // Returns true if cycling through windows is enabled. This is false at |
| 38 // certain times, such as when the lock screen is visible. |
| 39 static bool CanCycle(); |
| 40 |
| 41 // Cycles between windows in the given |direction|. |
| 42 void HandleCycleWindow(Direction direction); |
| 43 |
| 44 // Returns true if we are in the middle of a window cycling gesture. |
| 45 bool IsCycling() const { return window_cycle_list_.get() != NULL; } |
| 46 |
| 47 // Call to start cycling windows. This funtion adds a pre-target handler to |
| 48 // listen to the alt key release. |
| 49 void StartCycling(); |
| 50 |
| 51 // Stops the current window cycle and removes the event filter. |
| 52 void StopCycling(); |
| 53 |
| 54 // Returns the WindowCycleList. Really only useful for testing. |
| 55 const WindowCycleList* window_cycle_list() const { |
| 56 return window_cycle_list_.get(); |
| 57 } |
| 58 |
| 59 private: |
| 60 // Cycles to the next or previous window based on |direction|. |
| 61 void Step(Direction direction); |
| 62 |
| 63 scoped_ptr<WindowCycleList> window_cycle_list_; |
| 64 |
| 65 // Event handler to watch for release of alt key. |
| 66 scoped_ptr<ui::EventHandler> event_handler_; |
| 67 |
| 68 DISALLOW_COPY_AND_ASSIGN(WindowCycleController); |
| 69 }; |
| 70 |
| 71 } // namespace ash |
| 72 |
| 73 #endif // ASH_WM_WINDOW_CYCLE_CONTROLLER_H_ |
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