| // 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_LIST_H_ |
| #define ASH_WM_WINDOW_CYCLE_LIST_H_ |
| |
| #include <vector> |
| |
| #include "ash/ash_export.h" |
| #include "ash/wm/window_cycle_controller.h" |
| #include "base/basictypes.h" |
| #include "base/compiler_specific.h" |
| #include "base/memory/scoped_ptr.h" |
| #include "ui/aura/window_observer.h" |
| |
| namespace ash { |
| |
| class ScopedShowWindow; |
| |
| // Tracks a set of Windows that can be stepped through. This class is used by |
| // the WindowCycleController. |
| class ASH_EXPORT WindowCycleList : public aura::WindowObserver { |
| public: |
| typedef std::vector<aura::Window*> WindowList; |
| |
| explicit WindowCycleList(const WindowList& windows); |
| virtual ~WindowCycleList(); |
| |
| bool empty() const { return windows_.empty(); } |
| |
| // Cycles to the next or previous window based on |direction|. |
| void Step(WindowCycleController::Direction direction); |
| |
| const WindowList& windows() const { return windows_; } |
| |
| private: |
| // aura::WindowObserver overrides: |
| // There is a chance a window is destroyed, for example by JS code. We need to |
| // take care of that even if it is not intended for the user to close a window |
| // while window cycling. |
| virtual void OnWindowDestroyed(aura::Window* window) OVERRIDE; |
| |
| // List of weak pointers to windows to use while cycling with the keyboard. |
| // List is built when the user initiates the gesture (i.e. hits alt-tab the |
| // first time) and is emptied when the gesture is complete (i.e. releases the |
| // alt key). |
| WindowList windows_; |
| |
| // Current position in the |windows_| |
| int current_index_; |
| |
| // Wrapper for the window brought to the front. |
| scoped_ptr<ScopedShowWindow> showing_window_; |
| |
| DISALLOW_COPY_AND_ASSIGN(WindowCycleList); |
| }; |
| |
| } // namespace ash |
| |
| #endif // ASH_WM_WINDOW_CYCLE_LIST_H_ |