IntPoint ScrollableArea::constrainScrollPositionForOverhang(const IntPoint& scrollPosition)
{
return constrainScrollPositionForOverhang(visibleContentRect(), totalContentsSize(), scrollPosition, scrollOrigin(), headerHeight(), footerHeight());
}
void RenderLayerScrollableArea::updateAfterLayout()
{
m_scrollDimensionsDirty = true;
IntSize originalScrollOffset = adjustedScrollOffset();
computeScrollDimensions();
// Layout may cause us to be at an invalid scroll position. In this case we need
// to pull our scroll offsets back to the max (or push them up to the min).
IntSize clampedScrollOffset = clampScrollOffset(adjustedScrollOffset());
if (clampedScrollOffset != adjustedScrollOffset())
scrollToOffset(clampedScrollOffset);
if (originalScrollOffset != adjustedScrollOffset())
scrollToOffsetWithoutAnimation(-scrollOrigin() + adjustedScrollOffset());
bool hasHorizontalOverflow = this->hasHorizontalOverflow();
bool hasVerticalOverflow = this->hasVerticalOverflow();
{
// Hits in compositing/overflow/automatically-opt-into-composited-scrolling-after-style-change.html.
DisableCompositingQueryAsserts disabler;
// overflow:scroll should just enable/disable.
if (box().style()->overflowX() == OSCROLL)
horizontalScrollbar()->setEnabled(hasHorizontalOverflow);
if (box().style()->overflowY() == OSCROLL)
verticalScrollbar()->setEnabled(hasVerticalOverflow);
}
// overflow:auto may need to lay out again if scrollbars got added/removed.
bool autoHorizontalScrollBarChanged = box().hasAutoHorizontalScrollbar() && (hasHorizontalScrollbar() != hasHorizontalOverflow);
bool autoVerticalScrollBarChanged = box().hasAutoVerticalScrollbar() && (hasVerticalScrollbar() != hasVerticalOverflow);
if (autoHorizontalScrollBarChanged || autoVerticalScrollBarChanged) {
if (box().hasAutoHorizontalScrollbar())
setHasHorizontalScrollbar(hasHorizontalOverflow);
if (box().hasAutoVerticalScrollbar())
setHasVerticalScrollbar(hasVerticalOverflow);
layer()->updateSelfPaintingLayer();
if (box().style()->overflowX() == OAUTO || box().style()->overflowY() == OAUTO) {
if (!m_inOverflowRelayout) {
// Our proprietary overflow: overlay value doesn't trigger a layout.
m_inOverflowRelayout = true;
SubtreeLayoutScope layoutScope(box());
layoutScope.setNeedsLayout(&box());
if (box().isRenderBlock()) {
RenderBlock& block = toRenderBlock(box());
block.scrollbarsChanged(autoHorizontalScrollBarChanged, autoVerticalScrollBarChanged);
block.layoutBlock(true);
} else {
box().layout();
}
m_inOverflowRelayout = false;
}
}
}
{
// Hits in compositing/overflow/automatically-opt-into-composited-scrolling-after-style-change.html.
DisableCompositingQueryAsserts disabler;
// Set up the range (and page step/line step).
if (Scrollbar* horizontalScrollbar = this->horizontalScrollbar()) {
int clientWidth = box().pixelSnappedClientWidth();
horizontalScrollbar->setProportion(clientWidth, overflowRect().width());
}
if (Scrollbar* verticalScrollbar = this->verticalScrollbar()) {
int clientHeight = box().pixelSnappedClientHeight();
verticalScrollbar->setProportion(clientHeight, overflowRect().height());
}
}
bool hasOverflow = hasScrollableHorizontalOverflow() || hasScrollableVerticalOverflow();
updateScrollableAreaSet(hasOverflow);
if (hasOverflow) {
DisableCompositingQueryAsserts disabler;
positionOverflowControls(IntSize());
}
}
void RenderLayerScrollableArea::scrollToOffset(const IntSize& scrollOffset, ScrollOffsetClamping clamp)
{
IntSize newScrollOffset = clamp == ScrollOffsetClamped ? clampScrollOffset(scrollOffset) : scrollOffset;
if (newScrollOffset != adjustedScrollOffset())
scrollToOffsetWithoutAnimation(-scrollOrigin() + newScrollOffset);
}
IntPoint RenderLayerScrollableArea::maximumScrollPosition() const
{
if (!box().hasOverflowClip())
return -scrollOrigin();
return -scrollOrigin() + IntPoint(pixelSnappedScrollWidth(), pixelSnappedScrollHeight()) - enclosingIntRect(box().clientBoxRect()).size();
}
IntPoint RenderLayerScrollableArea::minimumScrollPosition() const
{
return -scrollOrigin();
}
FloatSize ScrollingTreeFrameScrollingNode::viewToContentsOffset(const FloatPoint& scrollOffset) const
{
return toFloatSize(scrollOffset) - toFloatSize(scrollOrigin()) - FloatSize(0, headerHeight() + topContentInset());
}
