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.
5 #ifndef ASH_WM_WINDOW_CYCLE_LIST_H_
6 #define ASH_WM_WINDOW_CYCLE_LIST_H_
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"
19 class ScopedShowWindow
;
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
{
25 typedef std::vector
<aura::Window
*> WindowList
;
27 explicit WindowCycleList(const WindowList
& windows
);
28 virtual ~WindowCycleList();
30 bool empty() const { return windows_
.empty(); }
32 // Cycles to the next or previous window based on |direction|.
33 void Step(WindowCycleController::Direction direction
);
35 const WindowList
& windows() const { return windows_
; }
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
;
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
50 // Current position in the |windows_|
53 // Wrapper for the window brought to the front.
54 scoped_ptr
<ScopedShowWindow
> showing_window_
;
56 DISALLOW_COPY_AND_ASSIGN(WindowCycleList
);
61 #endif // ASH_WM_WINDOW_CYCLE_LIST_H_