cc/animation/scroll_offset_animation_curve.h

   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
  13 namespace cc {
  14
  15 class TimingFunction;
  16
  17 class 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_