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// Copyright 2012 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 "CCScrollbarAnimationControllerLinearFade.h"
#include "CCScrollbarLayerImpl.h"
namespace cc {
PassOwnPtr<CCScrollbarAnimationControllerLinearFade> CCScrollbarAnimationControllerLinearFade::create(CCLayerImpl* scrollLayer, double fadeoutDelay, double fadeoutLength)
{
return adoptPtr(new CCScrollbarAnimationControllerLinearFade(scrollLayer, fadeoutDelay, fadeoutLength));
}
CCScrollbarAnimationControllerLinearFade::CCScrollbarAnimationControllerLinearFade(CCLayerImpl* scrollLayer, double fadeoutDelay, double fadeoutLength)
: CCScrollbarAnimationController(scrollLayer)
, m_lastAwakenTime(-100000000) // arbitrary invalid timestamp
, m_pinchGestureInEffect(false)
, m_fadeoutDelay(fadeoutDelay)
, m_fadeoutLength(fadeoutLength)
{
}
CCScrollbarAnimationControllerLinearFade::~CCScrollbarAnimationControllerLinearFade()
{
}
bool CCScrollbarAnimationControllerLinearFade::animate(double monotonicTime)
{
float opacity = opacityAtTime(monotonicTime);
if (horizontalScrollbarLayer())
horizontalScrollbarLayer()->setOpacity(opacity);
if (verticalScrollbarLayer())
verticalScrollbarLayer()->setOpacity(opacity);
return opacity;
}
void CCScrollbarAnimationControllerLinearFade::didPinchGestureUpdateAtTime(double)
{
m_pinchGestureInEffect = true;
}
void CCScrollbarAnimationControllerLinearFade::didPinchGestureEndAtTime(double monotonicTime)
{
m_pinchGestureInEffect = false;
m_lastAwakenTime = monotonicTime;
}
void CCScrollbarAnimationControllerLinearFade::updateScrollOffsetAtTime(CCLayerImpl* scrollLayer, double monotonicTime)
{
FloatPoint previousPos = currentPos();
CCScrollbarAnimationController::updateScrollOffsetAtTime(scrollLayer, monotonicTime);
if (previousPos == currentPos())
return;
m_lastAwakenTime = monotonicTime;
}
float CCScrollbarAnimationControllerLinearFade::opacityAtTime(double monotonicTime)
{
if (m_pinchGestureInEffect)
return 1;
double delta = monotonicTime - m_lastAwakenTime;
if (delta <= m_fadeoutDelay)
return 1;
if (delta < m_fadeoutDelay + m_fadeoutLength)
return (m_fadeoutDelay + m_fadeoutLength - delta) / m_fadeoutLength;
return 0;
}
} // namespace cc
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