LayoutState::LayoutState(LayoutUnit pageLogicalHeight, bool pageLogicalHeightChanged, RenderView& view)
: m_isPaginated(pageLogicalHeight)
, m_pageLogicalHeightChanged(pageLogicalHeightChanged)
, m_containingBlockLogicalWidthChanged(false)
, m_flowThread(0)
, m_columnInfo(0)
, m_next(0)
, m_pageLogicalHeight(pageLogicalHeight)
, m_renderer(view)
{
ASSERT(!view.layoutState());
view.pushLayoutState(*this);
}
void RenderMathMLBlock::computeChildrenPreferredLogicalHeights()
{
ASSERT(needsLayout());
// This is ugly, but disable fragmentation when computing the preferred heights.
FragmentationDisabler fragmentationDisabler(this);
// Ensure a full repaint will happen after layout finishes.
setNeedsLayout(true, MarkOnlyThis);
RenderView* renderView = view();
bool hadLayoutState = renderView->layoutState();
if (!hadLayoutState)
renderView->pushLayoutState(this);
{
LayoutStateDisabler layoutStateDisabler(renderView);
LayoutUnit oldAvailableLogicalWidth = availableLogicalWidth();
setLogicalWidth(cLargeLogicalWidth);
for (RenderObject* child = firstChild(); child; child = child->nextSibling()) {
if (!child->isBox())
continue;
// Because our width changed, |child| may need layout.
if (child->maxPreferredLogicalWidth() > oldAvailableLogicalWidth)
child->setNeedsLayout(true, MarkOnlyThis);
RenderMathMLBlock* childMathMLBlock = child->isRenderMathMLBlock() ? toRenderMathMLBlock(child) : 0;
if (childMathMLBlock && !childMathMLBlock->isPreferredLogicalHeightDirty())
continue;
// Layout our child to compute its preferred logical height.
child->layoutIfNeeded();
if (childMathMLBlock)
childMathMLBlock->setPreferredLogicalHeight(childMathMLBlock->logicalHeight());
}
}
if (!hadLayoutState)
renderView->popLayoutState(this);
}