Moves WindowCycleList/Controller to ash/common

ash/wm/window_cycle_controller.h

-// Copyright 2014 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 ASH_WM_WINDOW_CYCLE_CONTROLLER_H_
-#define ASH_WM_WINDOW_CYCLE_CONTROLLER_H_
-
-#include <memory>
-
-#include "ash/ash_export.h"
-#include "base/macros.h"
-#include "base/time/time.h"
-
-namespace ui {
-class EventHandler;
-}
-
-namespace ash {
-
-class WindowCycleEventFilter;
-class WindowCycleList;
-class WmWindow;
-
-// Controls cycling through windows with the keyboard via alt-tab.
-// Windows are sorted primarily by most recently used, and then by screen order.
-// We activate windows as you cycle through them, so the order on the screen
-// may change during the gesture, but the most recently used list isn't updated
-// until the cycling ends.  Thus we maintain the state of the windows
-// at the beginning of the gesture so you can cycle through in a consistent
-// order.
-class ASH_EXPORT WindowCycleController {
- public:
-  enum Direction { FORWARD, BACKWARD };
-
-  WindowCycleController();
-  virtual ~WindowCycleController();
-
-  // Returns true if cycling through windows is enabled. This is false at
-  // certain times, such as when the lock screen is visible.
-  static bool CanCycle();
-
-  // Cycles between windows in the given |direction|.
-  void HandleCycleWindow(Direction direction);
-
-  // Returns true if we are in the middle of a window cycling gesture.
-  bool IsCycling() const { return window_cycle_list_.get() != NULL; }
-
-  // Call to start cycling windows. This funtion adds a pre-target handler to
-  // listen to the alt key release.
-  void StartCycling();
-
-  // Stops the current window cycle and removes the event filter.
-  void StopCycling();
-
-  // Returns the WindowCycleList. Really only useful for testing.
-  const WindowCycleList* window_cycle_list() const {
-    return window_cycle_list_.get();
-  }
-
- private:
-  // Cycles to the next or previous window based on |direction|.
-  void Step(Direction direction);
-
-  std::unique_ptr<WindowCycleList> window_cycle_list_;
-
-  // Tracks what Window was active when starting to cycle and used to determine
-  // if the active Window changed in when ending cycling.
-  WmWindow* active_window_before_window_cycle_ = nullptr;
-
-  // Non-null while actively cycling.
-  std::unique_ptr<WindowCycleEventFilter> event_filter_;
-
-  base::Time cycle_start_time_;
-
-  DISALLOW_COPY_AND_ASSIGN(WindowCycleController);
-};
-
-}  // namespace ash
-
-#endif  // ASH_WM_WINDOW_CYCLE_CONTROLLER_H_