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/gfx/animation/linear_animation.h"
9
10namespace autofill {
11
12// An animation for a dancing ellipsis.
13class LoadingAnimation : public gfx::LinearAnimation {
14 public:
15  explicit LoadingAnimation(gfx::AnimationDelegate* delegate,
16                            int font_height);
17  virtual ~LoadingAnimation();
18
19  // gfx::Animation implementation.
20  virtual void Step(base::TimeTicks time_now) OVERRIDE;
21
22  // Returns the vertical pixel offset for the nth dot.
23  double GetCurrentValueForDot(size_t dot_i) const;
24
25  // Stops this animation. Use this instead of Stop() to make sure future
26  // runs don't mess up on the first cycle.
27  void Reset();
28
29 private:
30  // Describes a frame of the animation, a la -webkit-keyframes.
31  struct AnimationFrame {
32    double value;
33    double position;
34  };
35
36  // True if the current cycle is the first one since Reset() was last called.
37  bool first_cycle_;
38
39  // The font height of the loading text, which gives the factor by which to
40  // scale the animation.
41  const int font_height_;
42};
43
44}  // namespace autofill
45
46#endif  // CHROME_BROWSER_UI_AUTOFILL_LOADING_ANIMATION_H_
47