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 CC_ANIMATION_SCROLL_OFFSET_ANIMATION_CURVE_H_
6#define CC_ANIMATION_SCROLL_OFFSET_ANIMATION_CURVE_H_
7
8#include "base/memory/scoped_ptr.h"
9#include "base/time/time.h"
10#include "cc/animation/animation_curve.h"
11#include "cc/base/cc_export.h"
12
13namespace cc {
14
15class TimingFunction;
16
17class CC_EXPORT ScrollOffsetAnimationCurve : public AnimationCurve {
18 public:
19  static scoped_ptr<ScrollOffsetAnimationCurve> Create(
20      const gfx::Vector2dF& target_value,
21      scoped_ptr<TimingFunction> timing_function);
22
23  virtual ~ScrollOffsetAnimationCurve();
24
25  void SetInitialValue(const gfx::Vector2dF& initial_value);
26  gfx::Vector2dF GetValue(double t) const;
27  gfx::Vector2dF target_value() const { return target_value_; }
28  void UpdateTarget(double t, const gfx::Vector2dF& new_target);
29
30  // AnimationCurve implementation
31  virtual double Duration() const OVERRIDE;
32  virtual CurveType Type() const OVERRIDE;
33  virtual scoped_ptr<AnimationCurve> Clone() const OVERRIDE;
34
35 private:
36  ScrollOffsetAnimationCurve(const gfx::Vector2dF& target_value,
37                             scoped_ptr <TimingFunction> timing_function);
38
39  gfx::Vector2dF initial_value_;
40  gfx::Vector2dF target_value_;
41  base::TimeDelta total_animation_duration_;
42
43  // Time from animation start to most recent UpdateTarget.
44  base::TimeDelta last_retarget_;
45
46  scoped_ptr<TimingFunction> timing_function_;
47
48  DISALLOW_COPY_AND_ASSIGN(ScrollOffsetAnimationCurve);
49};
50
51}  // namespace cc
52
53#endif  // CC_ANIMATION_SCROLL_OFFSET_ANIMATION_CURVE_H_
54