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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_LIST_H_
      6 #define ASH_WM_WINDOW_CYCLE_LIST_H_
      7 
      8 #include <vector>
      9 
     10 #include "ash/ash_export.h"
     11 #include "ash/wm/window_cycle_controller.h"
     12 #include "base/basictypes.h"
     13 #include "base/compiler_specific.h"
     14 #include "base/memory/scoped_ptr.h"
     15 #include "ui/aura/window_observer.h"
     16 
     17 namespace ash {
     18 
     19 class ScopedShowWindow;
     20 
     21 // Tracks a set of Windows that can be stepped through. This class is used by
     22 // the WindowCycleController.
     23 class ASH_EXPORT WindowCycleList : public aura::WindowObserver {
     24  public:
     25   typedef std::vector<aura::Window*> WindowList;
     26 
     27   explicit WindowCycleList(const WindowList& windows);
     28   virtual ~WindowCycleList();
     29 
     30   bool empty() const { return windows_.empty(); }
     31 
     32   // Cycles to the next or previous window based on |direction|.
     33   void Step(WindowCycleController::Direction direction);
     34 
     35   const WindowList& windows() const { return windows_; }
     36 
     37  private:
     38   // aura::WindowObserver overrides:
     39   // There is a chance a window is destroyed, for example by JS code. We need to
     40   // take care of that even if it is not intended for the user to close a window
     41   // while window cycling.
     42   virtual void OnWindowDestroyed(aura::Window* window) OVERRIDE;
     43 
     44   // List of weak pointers to windows to use while cycling with the keyboard.
     45   // List is built when the user initiates the gesture (i.e. hits alt-tab the
     46   // first time) and is emptied when the gesture is complete (i.e. releases the
     47   // alt key).
     48   WindowList windows_;
     49 
     50   // Current position in the |windows_|
     51   int current_index_;
     52 
     53   // Wrapper for the window brought to the front.
     54   scoped_ptr<ScopedShowWindow> showing_window_;
     55 
     56   DISALLOW_COPY_AND_ASSIGN(WindowCycleList);
     57 };
     58 
     59 }  // namespace ash
     60 
     61 #endif  // ASH_WM_WINDOW_CYCLE_LIST_H_
     62