cc/blink/web_scroll_offset_animation_curve_impl.cc

// Copyright 2014 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.

#include "cc/blink/web_scroll_offset_animation_curve_impl.h"

#include "cc/animation/scroll_offset_animation_curve.h"
#include "cc/animation/timing_function.h"
#include "cc/blink/web_animation_curve_common.h"

using blink::WebFloatPoint;
using blink::WebScrollOffsetAnimationCurve;
using DurationBehavior = cc::ScrollOffsetAnimationCurve::DurationBehavior;

namespace cc_blink {

static DurationBehavior GetDurationBehavior(
    WebScrollOffsetAnimationCurve::ScrollDurationBehavior webDurationBehavior) {
  switch (webDurationBehavior) {
    case WebScrollOffsetAnimationCurve::ScrollDurationDeltaBased:
      return DurationBehavior::DELTA_BASED;

    case WebScrollOffsetAnimationCurve::ScrollDurationConstant:
      return DurationBehavior::CONSTANT;

    case WebScrollOffsetAnimationCurve::ScrollDurationInverseDelta:
      return DurationBehavior::INVERSE_DELTA;
  }
  NOTREACHED();
  return DurationBehavior::DELTA_BASED;
}

WebScrollOffsetAnimationCurveImpl::WebScrollOffsetAnimationCurveImpl(
    WebFloatPoint target_value,
    TimingFunctionType timing_function,
    ScrollDurationBehavior duration_behavior)
    : curve_(cc::ScrollOffsetAnimationCurve::Create(
          gfx::ScrollOffset(target_value.x, target_value.y),
          CreateTimingFunction(timing_function),
          GetDurationBehavior(duration_behavior))) {}

WebScrollOffsetAnimationCurveImpl::~WebScrollOffsetAnimationCurveImpl() {
}

blink::WebCompositorAnimationCurve::AnimationCurveType
WebScrollOffsetAnimationCurveImpl::type() const {
  return WebCompositorAnimationCurve::AnimationCurveTypeScrollOffset;
}

void WebScrollOffsetAnimationCurveImpl::setInitialValue(
    WebFloatPoint initial_value) {
  curve_->SetInitialValue(gfx::ScrollOffset(initial_value.x, initial_value.y));
}

WebFloatPoint WebScrollOffsetAnimationCurveImpl::getValue(double time) const {
  gfx::ScrollOffset value =
      curve_->GetValue(base::TimeDelta::FromSecondsD(time));
  return WebFloatPoint(value.x(), value.y());
}

double WebScrollOffsetAnimationCurveImpl::duration() const {
  return curve_->Duration().InSecondsF();
}

WebFloatPoint WebScrollOffsetAnimationCurveImpl::targetValue() const {
  gfx::ScrollOffset target = curve_->target_value();
  return WebFloatPoint(target.x(), target.y());
}

void WebScrollOffsetAnimationCurveImpl::updateTarget(double time,
                                                     WebFloatPoint new_target) {
  curve_->UpdateTarget(time, gfx::ScrollOffset(new_target.x, new_target.y));
}

scoped_ptr<cc::AnimationCurve>
WebScrollOffsetAnimationCurveImpl::CloneToAnimationCurve() const {
  return curve_->Clone();
}

}  // namespace cc_blink