void RenderFlowThread::validateRegions()
{
if (m_regionsInvalidated) {
m_regionsInvalidated = false;
m_regionsHaveUniformLogicalHeight = true;
if (hasRegions()) {
LayoutUnit previousRegionLogicalHeight = 0;
bool firstRegionVisited = false;
for (RenderMultiColumnSetList::iterator iter = m_multiColumnSetList.begin(); iter != m_multiColumnSetList.end(); ++iter) {
RenderMultiColumnSet* columnSet = *iter;
LayoutUnit regionLogicalHeight = columnSet->pageLogicalHeight();
if (!firstRegionVisited) {
firstRegionVisited = true;
} else {
if (m_regionsHaveUniformLogicalHeight && previousRegionLogicalHeight != regionLogicalHeight)
m_regionsHaveUniformLogicalHeight = false;
}
previousRegionLogicalHeight = regionLogicalHeight;
}
}
}
updateLogicalWidth(); // Called to get the maximum logical width for the columnSet.
updateRegionsFlowThreadPortionRect();
}
LayoutUnit RenderFlowThread::pageLogicalHeightForOffset(LayoutUnit offset)
{
RenderMultiColumnSet* columnSet = columnSetAtBlockOffset(offset);
if (!columnSet)
return 0;
return columnSet->pageLogicalHeight();
}
LayoutUnit RenderFlowThread::pageRemainingLogicalHeightForOffset(LayoutUnit offset, PageBoundaryRule pageBoundaryRule)
{
RenderMultiColumnSet* columnSet = columnSetAtBlockOffset(offset);
if (!columnSet)
return 0;
LayoutUnit pageLogicalTop = columnSet->pageLogicalTopForOffset(offset);
LayoutUnit pageLogicalHeight = columnSet->pageLogicalHeight();
LayoutUnit pageLogicalBottom = pageLogicalTop + pageLogicalHeight;
LayoutUnit remainingHeight = pageLogicalBottom - offset;
if (pageBoundaryRule == IncludePageBoundary) {
// If IncludePageBoundary is set, the line exactly on the top edge of a
// columnSet will act as being part of the previous columnSet.
remainingHeight = intMod(remainingHeight, pageLogicalHeight);
}
return remainingHeight;
}