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#include "config.h"
#include "ScrollableLayerAndroid.h"
#if USE(ACCELERATED_COMPOSITING)
namespace WebCore {
bool ScrollableLayerAndroid::scrollTo(int x, int y)
{
SkIRect scrollBounds;
getScrollRect(&scrollBounds);
if (!scrollBounds.fRight && !scrollBounds.fBottom)
return false;
SkScalar newX = SkScalarPin(x, 0, scrollBounds.fRight);
SkScalar newY = SkScalarPin(y, 0, scrollBounds.fBottom);
// Check for no change.
if (newX == scrollBounds.fLeft && newY == scrollBounds.fTop)
return false;
setPosition(m_scrollLimits.fLeft - newX, m_scrollLimits.fTop - newY);
return true;
}
void ScrollableLayerAndroid::getScrollRect(SkIRect* out) const
{
const SkPoint& pos = getPosition();
out->fLeft = m_scrollLimits.fLeft - pos.fX;
out->fTop = m_scrollLimits.fTop - pos.fY;
out->fRight = getSize().width() - m_scrollLimits.width();
out->fBottom = getSize().height() - m_scrollLimits.height();
}
bool ScrollableLayerAndroid::scrollRectIntoView(const SkIRect& rect)
{
// Apply the local transform to the rect to get it relative to the parent
// layer.
SkMatrix localTransform;
getLocalTransform(&localTransform);
SkRect transformedRect;
transformedRect.set(rect);
localTransform.mapRect(&transformedRect);
// Test left before right to prioritize left alignment if transformedRect is wider than
// visible area.
int x = m_scrollLimits.fLeft;
if (transformedRect.fLeft < m_scrollLimits.fLeft)
x = transformedRect.fLeft;
else if (transformedRect.fRight > m_scrollLimits.fRight)
x = transformedRect.fRight - std::max(m_scrollLimits.width(), transformedRect.width());
// Test top before bottom to prioritize top alignment if transformedRect is taller than
// visible area.
int y = m_scrollLimits.fTop;
if (transformedRect.fTop < m_scrollLimits.fTop)
y = transformedRect.fTop;
else if (transformedRect.fBottom > m_scrollLimits.fBottom)
y = transformedRect.fBottom - std::max(m_scrollLimits.height(), transformedRect.height());
return scrollTo(x - getPosition().fX, y - getPosition().fY);
}
} // namespace WebCore
#endif // USE(ACCELERATED_COMPOSITING)
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