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// Copyright 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CC_ANIMATION_SCROLL_OFFSET_ANIMATION_CURVE_H_
#define CC_ANIMATION_SCROLL_OFFSET_ANIMATION_CURVE_H_
#include "base/macros.h"
#include "base/memory/scoped_ptr.h"
#include "base/time/time.h"
#include "cc/animation/animation_curve.h"
#include "cc/base/cc_export.h"
#include "ui/gfx/geometry/scroll_offset.h"
namespace cc {
class TimingFunction;
class CC_EXPORT ScrollOffsetAnimationCurve : public AnimationCurve {
public:
enum class DurationBehavior { DELTA_BASED, CONSTANT, INVERSE_DELTA };
static scoped_ptr<ScrollOffsetAnimationCurve> Create(
const gfx::ScrollOffset& target_value,
scoped_ptr<TimingFunction> timing_function,
DurationBehavior = DurationBehavior::DELTA_BASED);
~ScrollOffsetAnimationCurve() override;
void SetInitialValue(const gfx::ScrollOffset& initial_value);
bool HasSetInitialValue() const;
gfx::ScrollOffset GetValue(base::TimeDelta t) const;
gfx::ScrollOffset target_value() const { return target_value_; }
void UpdateTarget(double t, const gfx::ScrollOffset& new_target);
// AnimationCurve implementation
base::TimeDelta Duration() const override;
CurveType Type() const override;
scoped_ptr<AnimationCurve> Clone() const override;
private:
ScrollOffsetAnimationCurve(const gfx::ScrollOffset& target_value,
scoped_ptr<TimingFunction> timing_function,
DurationBehavior);
gfx::ScrollOffset initial_value_;
gfx::ScrollOffset target_value_;
base::TimeDelta total_animation_duration_;
// Time from animation start to most recent UpdateTarget.
base::TimeDelta last_retarget_;
scoped_ptr<TimingFunction> timing_function_;
DurationBehavior duration_behavior_;
bool has_set_initial_value_;
DISALLOW_COPY_AND_ASSIGN(ScrollOffsetAnimationCurve);
};
} // namespace cc
#endif // CC_ANIMATION_SCROLL_OFFSET_ANIMATION_CURVE_H_