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      1 // Copyright 2013 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_SELECTOR_CONTROLLER_H_
      6 #define ASH_WM_WINDOW_SELECTOR_CONTROLLER_H_
      7 
      8 #include <list>
      9 #include <vector>
     10 
     11 #include "ash/ash_export.h"
     12 #include "ash/wm/window_selector.h"
     13 #include "ash/wm/window_selector_delegate.h"
     14 #include "base/basictypes.h"
     15 #include "base/memory/scoped_ptr.h"
     16 #include "ui/aura/window_observer.h"
     17 
     18 namespace aura {
     19 class Window;
     20 }
     21 
     22 namespace ui {
     23 class EventHandler;
     24 }
     25 
     26 namespace ash {
     27 
     28 class WindowSelector;
     29 
     30 // Manages a window selector which displays an overview of all windows and
     31 // allows selecting a window to activate it.
     32 class ASH_EXPORT WindowSelectorController
     33     : public WindowSelectorDelegate {
     34  public:
     35   WindowSelectorController();
     36   virtual ~WindowSelectorController();
     37 
     38   // Returns true if selecting windows in an overview is enabled. This is false
     39   // at certain times, such as when the lock screen is visible.
     40   static bool CanSelect();
     41 
     42   // Enters overview mode. This is essentially the window cycling mode however
     43   // not released on releasing the alt key and allows selecting with the mouse
     44   // or touch rather than keypresses.
     45   void ToggleOverview();
     46 
     47   // Cycles between windows in the given |direction|. It is assumed that the
     48   // alt key is held down and a key filter is installed to watch for alt being
     49   // released.
     50   void HandleCycleWindow(WindowSelector::Direction direction);
     51 
     52   // Informs the controller that the Alt key has been released and it can
     53   // terminate the existing multi-step cycle.
     54   void AltKeyReleased();
     55 
     56   // Returns true if window selection mode is active.
     57   bool IsSelecting();
     58 
     59   // WindowSelectorDelegate:
     60   virtual void OnWindowSelected(aura::Window* window) OVERRIDE;
     61   virtual void OnSelectionCanceled() OVERRIDE;
     62 
     63  private:
     64   scoped_ptr<WindowSelector> window_selector_;
     65   scoped_ptr<ui::EventHandler> event_handler_;
     66 
     67   DISALLOW_COPY_AND_ASSIGN(WindowSelectorController);
     68 };
     69 
     70 }  // namespace ash
     71 
     72 #endif  // ASH_WM_WINDOW_SELECTOR_CONTROLLER_H_
     73