void RenderBlockFlow::layoutBlockChildren(bool relayoutChildren, SubtreeLayoutScope& layoutScope, LayoutUnit beforeEdge, LayoutUnit afterEdge)
{
dirtyForLayoutFromPercentageHeightDescendants(layoutScope);
RenderBox* next = firstChildBox();
RenderBox* lastNormalFlowChild = 0;
while (next) {
RenderBox* child = next;
next = child->nextSiblingBox();
// FIXME: this should only be set from clearNeedsLayout crbug.com/361250
child->setLayoutDidGetCalled(true);
updateBlockChildDirtyBitsBeforeLayout(relayoutChildren, child);
if (child->isOutOfFlowPositioned()) {
child->containingBlock()->insertPositionedObject(child);
adjustPositionedBlock(child);
continue;
}
// Lay out the child.
layoutBlockChild(child);
lastNormalFlowChild = child;
}
// Negative margins can cause our height to shrink below our minimal height (border/padding).
// If this happens, ensure that the computed height is increased to the minimal height.
setLogicalHeight(std::max(logicalHeight() + afterEdge, beforeEdge + afterEdge));
}
LayoutRect RenderNamedFlowThread::decorationsClipRectForBoxInNamedFlowFragment(const RenderBox& box, RenderNamedFlowFragment& fragment) const
{
LayoutRect visualOverflowRect = fragment.visualOverflowRectForBox(&box);
LayoutUnit initialLogicalX = style().isHorizontalWritingMode() ? visualOverflowRect.x() : visualOverflowRect.y();
// The visual overflow rect returned by visualOverflowRectForBox is already flipped but the
// RenderRegion::rectFlowPortionForBox method expects it unflipped.
flipForWritingModeLocalCoordinates(visualOverflowRect);
visualOverflowRect = fragment.rectFlowPortionForBox(&box, visualOverflowRect);
// Now flip it again.
flipForWritingModeLocalCoordinates(visualOverflowRect);
// Take the scrolled offset of this object's parents into consideration.
IntSize scrolledContentOffset;
RenderBlock* containingBlock = box.containingBlock();
while (containingBlock) {
if (containingBlock->isRenderNamedFlowThread()) {
// We've reached the flow thread, take the scrolled offset of the region into consideration.
ASSERT(containingBlock == this);
scrolledContentOffset += fragment.fragmentContainer().scrolledContentOffset();
break;
}
scrolledContentOffset += containingBlock->scrolledContentOffset();
containingBlock = containingBlock->containingBlock();
}
if (!scrolledContentOffset.isZero()) {
if (style().isFlippedBlocksWritingMode())
scrolledContentOffset = -scrolledContentOffset;
visualOverflowRect.inflateX(scrolledContentOffset.width());
visualOverflowRect.inflateY(scrolledContentOffset.height());
}
// Layers are in physical coordinates so the origin must be moved to the physical top-left of the flowthread.
if (style().isFlippedBlocksWritingMode()) {
if (style().isHorizontalWritingMode())
visualOverflowRect.moveBy(LayoutPoint(0, height()));
else
visualOverflowRect.moveBy(LayoutPoint(width(), 0));
}
const RenderBox* iterBox = &box;
while (iterBox && iterBox != this) {
RenderBlock* containerBlock = iterBox->containingBlock();
// FIXME: This doesn't work properly with flipped writing modes.
// https://bugs.webkit.org/show_bug.cgi?id=125149
if (iterBox->isPositioned()) {
// For positioned elements, just use the layer's absolute bounding box.
visualOverflowRect.moveBy(iterBox->layer()->absoluteBoundingBox().location());
break;
}
LayoutRect currentBoxRect = iterBox->frameRect();
if (iterBox->style().isFlippedBlocksWritingMode()) {
if (iterBox->style().isHorizontalWritingMode())
currentBoxRect.setY(currentBoxRect.height() - currentBoxRect.maxY());
else
currentBoxRect.setX(currentBoxRect.width() - currentBoxRect.maxX());
}
if (containerBlock->style().writingMode() != iterBox->style().writingMode())
iterBox->flipForWritingMode(currentBoxRect);
visualOverflowRect.moveBy(currentBoxRect.location());
iterBox = containerBlock;
}
// Since the purpose of this method is to make sure the borders of a fragmented
// element don't overflow the region in the fragmentation direction, there's no
// point in restricting the clipping rect on the logical X axis.
// This also saves us the trouble of handling percent-based widths and margins
// since the absolute bounding box of a positioned element would not contain
// the correct coordinates relative to the region we're interested in, but rather
// relative to the actual flow thread.
if (style().isHorizontalWritingMode()) {
if (initialLogicalX < visualOverflowRect.x())
visualOverflowRect.shiftXEdgeTo(initialLogicalX);
if (visualOverflowRect.width() < frameRect().width())
visualOverflowRect.setWidth(frameRect().width());
} else {
if (initialLogicalX < visualOverflowRect.y())
visualOverflowRect.shiftYEdgeTo(initialLogicalX);
if (visualOverflowRect.height() < frameRect().height())
visualOverflowRect.setHeight(frameRect().height());
}
return visualOverflowRect;
}
void RenderMathMLRow::layoutRowItems(LayoutUnit& ascent, LayoutUnit& descent)
{
// We first stretch the vertical operators.
// For inline formulas, we can then calculate the logical width.
LayoutUnit width = borderAndPaddingStart();
for (RenderBox* child = firstChildBox(); child; child = child->nextSiblingBox()) {
if (child->isOutOfFlowPositioned())
continue;
if (is<RenderMathMLBlock>(child)) {
auto renderOperator = downcast<RenderMathMLBlock>(child)->unembellishedOperator();
if (renderOperator && renderOperator->hasOperatorFlag(MathMLOperatorDictionary::Stretchy) && renderOperator->isVertical())
renderOperator->stretchTo(ascent, descent);
}
child->layoutIfNeeded();
width += child->marginStart() + child->logicalWidth() + child->marginEnd();
}
width += borderEnd() + paddingEnd();
// FIXME: RenderMathMLRoot classes should also recalculate the exact logical width instead of using the preferred width.
// See http://webkit.org/b/153987
if ((!isRenderMathMLMath() || style().display() == INLINE) && !isRenderMathMLRoot())
setLogicalWidth(width);
LayoutUnit verticalOffset = borderTop() + paddingTop();
LayoutUnit maxAscent = 0, maxDescent = 0; // Used baseline alignment.
LayoutUnit horizontalOffset = borderAndPaddingStart();
bool shouldFlipHorizontal = !style().isLeftToRightDirection();
for (RenderBox* child = firstChildBox(); child; child = child->nextSiblingBox()) {
if (child->isOutOfFlowPositioned()) {
child->containingBlock()->insertPositionedObject(*child);
continue;
}
LayoutUnit childHorizontalExtent = child->logicalWidth();
LayoutUnit ascent = ascentForChild(*child);
LayoutUnit descent = child->verticalMarginExtent() + child->logicalHeight() - ascent;
maxAscent = std::max(maxAscent, ascent);
maxDescent = std::max(maxDescent, descent);
LayoutUnit childVerticalMarginBoxExtent = maxAscent + maxDescent;
horizontalOffset += child->marginStart();
setLogicalHeight(std::max(logicalHeight(), verticalOffset + borderBottom() + paddingBottom() + childVerticalMarginBoxExtent + horizontalScrollbarHeight()));
LayoutPoint childLocation(shouldFlipHorizontal ? logicalWidth() - horizontalOffset - childHorizontalExtent : horizontalOffset, verticalOffset + child->marginTop());
child->setLocation(childLocation);
horizontalOffset += childHorizontalExtent + child->marginEnd();
}
LayoutUnit centerBlockOffset = 0;
// FIXME: Remove the FLEX when it is not required by the css.
if (style().display() == BLOCK || style().display() == FLEX)
centerBlockOffset = std::max<LayoutUnit>(0, (logicalWidth() - (horizontalOffset + borderEnd() + paddingEnd())) / 2);
if (shouldFlipHorizontal && centerBlockOffset > 0)
centerBlockOffset = -centerBlockOffset;
for (RenderBox* child = firstChildBox(); child; child = child->nextSiblingBox()) {
LayoutUnit ascent = ascentForChild(*child);
LayoutUnit startOffset = maxAscent - ascent;
child->setLocation(child->location() + LayoutPoint(centerBlockOffset, startOffset));
}
ascent = maxAscent;
descent = maxDescent;
}
