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/*
* Copyright (c) 2010, Google Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "ScrollAnimator.h"
#include "FloatPoint.h"
#include "ScrollableArea.h"
#include <algorithm>
#include <wtf/PassOwnPtr.h>
namespace WebCore {
#if !ENABLE(SMOOTH_SCROLLING)
PassOwnPtr<ScrollAnimator> ScrollAnimator::create(ScrollableArea* scrollableArea)
{
return adoptPtr(new ScrollAnimator(scrollableArea));
}
#endif
ScrollAnimator::ScrollAnimator(ScrollableArea* scrollableArea)
: m_scrollableArea(scrollableArea)
, m_currentPosX(0)
, m_currentPosY(0)
{
}
ScrollAnimator::~ScrollAnimator()
{
}
bool ScrollAnimator::scroll(ScrollbarOrientation orientation, ScrollGranularity, float step, float multiplier)
{
float* currentPos = (orientation == HorizontalScrollbar) ? &m_currentPosX : &m_currentPosY;
float newPos = std::max(std::min(*currentPos + (step * multiplier), static_cast<float>(m_scrollableArea->scrollSize(orientation))), 0.0f);
if (*currentPos == newPos)
return false;
*currentPos = newPos;
notityPositionChanged();
return true;
}
void ScrollAnimator::scrollToOffsetWithoutAnimation(const FloatPoint& offset)
{
if (m_currentPosX != offset.x() || m_currentPosY != offset.y()) {
m_currentPosX = offset.x();
m_currentPosY = offset.y();
notityPositionChanged();
}
}
FloatPoint ScrollAnimator::currentPosition() const
{
return FloatPoint(m_currentPosX, m_currentPosY);
}
void ScrollAnimator::notityPositionChanged()
{
m_scrollableArea->setScrollOffsetFromAnimation(IntPoint(m_currentPosX, m_currentPosY));
}
} // namespace WebCore
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