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