blob: 3ac687e2ca66672095d4eeccda93d5ee26a6ccf9 [file] [log] [blame]
// 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 "config.h"
#include "platform/scroll/ProgrammaticScrollAnimator.h"
#include "platform/geometry/IntPoint.h"
#include "platform/scroll/ScrollableArea.h"
#include "public/platform/Platform.h"
#include "public/platform/WebCompositorSupport.h"
#include "public/platform/WebScrollOffsetAnimationCurve.h"
namespace blink {
PassOwnPtr<ProgrammaticScrollAnimator> ProgrammaticScrollAnimator::create(ScrollableArea* scrollableArea)
{
return adoptPtr(new ProgrammaticScrollAnimator(scrollableArea));
}
ProgrammaticScrollAnimator::ProgrammaticScrollAnimator(ScrollableArea* scrollableArea)
: m_scrollableArea(scrollableArea)
, m_startTime(0.0)
{
}
ProgrammaticScrollAnimator::~ProgrammaticScrollAnimator()
{
}
void ProgrammaticScrollAnimator::resetAnimationState()
{
m_animationCurve.clear();
m_startTime = 0.0;
}
void ProgrammaticScrollAnimator::animateToOffset(FloatPoint offset)
{
m_startTime = 0.0;
m_targetOffset = offset;
m_animationCurve = adoptPtr(Platform::current()->compositorSupport()->createScrollOffsetAnimationCurve(m_targetOffset, WebAnimationCurve::TimingFunctionTypeEaseInOut));
m_animationCurve->setInitialValue(FloatPoint(m_scrollableArea->scrollPosition()));
if (!m_scrollableArea->scheduleAnimation()) {
resetAnimationState();
m_scrollableArea->notifyScrollPositionChanged(IntPoint(offset.x(), offset.y()));
}
}
void ProgrammaticScrollAnimator::cancelAnimation()
{
resetAnimationState();
}
void ProgrammaticScrollAnimator::tickAnimation(double monotonicTime)
{
if (m_animationCurve) {
if (!m_startTime)
m_startTime = monotonicTime;
double elapsedTime = monotonicTime - m_startTime;
bool isFinished = (elapsedTime > m_animationCurve->duration());
FloatPoint offset = m_animationCurve->getValue(elapsedTime);
m_scrollableArea->notifyScrollPositionChanged(IntPoint(offset.x(), offset.y()));
if (isFinished) {
resetAnimationState();
} else if (!m_scrollableArea->scheduleAnimation()) {
m_scrollableArea->notifyScrollPositionChanged(IntPoint(m_targetOffset.x(), m_targetOffset.y()));
resetAnimationState();
}
}
}
} // namespace blink