1// Copyright (c) 2012 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_GESTURES_LONG_PRESS_AFFORDANCE_HANDLER_H_
6#define ASH_WM_GESTURES_LONG_PRESS_AFFORDANCE_HANDLER_H_
7
8#include "base/timer/timer.h"
9#include "ui/aura/window_observer.h"
10#include "ui/gfx/animation/linear_animation.h"
11#include "ui/gfx/point.h"
12
13namespace ui {
14class GestureEvent;
15}
16
17namespace ash {
18
19namespace test {
20class SystemGestureEventFilterTest;
21}
22
23// LongPressAffordanceHandler displays an animated affordance that is shown
24// on a TAP_DOWN gesture. The animation sequence consists of two parts:
25// The first part is a grow animation that starts at semi-long-press and
26// completes on a long-press gesture. The affordance animates to full size
27// during grow animation.
28// The second part is a shrink animation that start after grow and shrinks the
29// affordance out of view.
30class LongPressAffordanceHandler : public gfx::LinearAnimation,
31                                   public aura::WindowObserver {
32 public:
33  LongPressAffordanceHandler();
34  virtual ~LongPressAffordanceHandler();
35
36  // Displays or removes long press affordance according to the |event|.
37  void ProcessEvent(aura::Window* target, ui::GestureEvent* event);
38
39 private:
40  friend class ash::test::SystemGestureEventFilterTest;
41
42  class LongPressAffordanceView;
43
44  enum LongPressAnimationType {
45    NONE,
46    GROW_ANIMATION,
47    SHRINK_ANIMATION,
48  };
49
50  void StartAnimation();
51  void StopAffordance();
52  void SetTapDownTarget(aura::Window* target);
53
54  // Overridden from gfx::LinearAnimation.
55  virtual void AnimateToState(double state) OVERRIDE;
56  virtual void AnimationStopped() OVERRIDE;
57
58  // Overridden from aura::WindowObserver.
59  virtual void OnWindowDestroying(aura::Window* window) OVERRIDE;
60
61  scoped_ptr<LongPressAffordanceView> view_;
62  gfx::Point tap_down_location_;
63  base::OneShotTimer<LongPressAffordanceHandler> timer_;
64  aura::Window* tap_down_target_;
65  LongPressAnimationType current_animation_type_;
66
67  DISALLOW_COPY_AND_ASSIGN(LongPressAffordanceHandler);
68};
69
70}  // namespace ash
71
72#endif  // ASH_WM_GESTURES_LONG_PRESS_AFFORDANCE_HANDLER_H_
73