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// Copyright (c) 2012 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 "base/basictypes.h"
#include "base/compiler_specific.h"
#include "ui/aura/window_observer.h"
namespace ash {
// 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;
enum Direction {
FORWARD,
BACKWARD
};
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(Direction direction);
const WindowList& windows() const { return windows_; }
private:
// Returns the index of |window| in |windows_| or -1 if it isn't there.
int GetWindowIndex(aura::Window* window);
// aura::WindowObserver overrides:
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 (e.g. hits alt-tab the
// first time) and is emptied when the gesture is complete (e.g. releases the
// alt key).
WindowList windows_;
// Current position in the |windows_| list or -1 if we're not cycling.
int current_index_;
DISALLOW_COPY_AND_ASSIGN(WindowCycleList);
};
} // namespace ash
#endif // ASH_WM_WINDOW_CYCLE_LIST_H_
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