loading_animation.h revision 58537e28ecd584eab876aee8be7156509866d23a 
1// Copyright 2013 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 CHROME_BROWSER_UI_AUTOFILL_LOADING_ANIMATION_H_
6#define CHROME_BROWSER_UI_AUTOFILL_LOADING_ANIMATION_H_
7
8#include "ui/base/animation/linear_animation.h"
9
10namespace autofill {
11
12// An animation for a dancing ellipsis.
13class LoadingAnimation : public ui::LinearAnimation {
14 public:
15  explicit LoadingAnimation(ui::AnimationDelegate* delegate);
16  virtual ~LoadingAnimation();
17
18  // ui::Animation implementation.
19  virtual void Step(base::TimeTicks time_now) OVERRIDE;
20
21  // Returns the vertical pixel offset for the nth dot.
22  double GetCurrentValueForDot(size_t dot_i);
23
24  // Stops this animation. Use this instead of Stop() to make sure future
25  // runs don't mess up on the first cycle.
26  void Reset();
27
28 private:
29  // Describes a frame of the animation, a la -webkit-keyframes.
30  struct AnimationFrame {
31    double value;
32    double position;
33  };
34
35  // True if the current cycle is the first one since Reset() was last called.
36  bool first_cycle_;
37};
38
39}  // namespace autofill
40
41#endif  // CHROME_BROWSER_UI_AUTOFILL_LOADING_ANIMATION_H_
42