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27 #include "core/rendering/RenderRegionSet.h"
29 #include "core/rendering/RenderFlowThread.h"
33 RenderRegionSet::RenderRegionSet(Element* element, RenderFlowThread* flowThread)
34 : RenderRegion(element, flowThread)
38 void RenderRegionSet::expandToEncompassFlowThreadContentsIfNeeded()
40 // Whenever the last region is a set, it always expands its region rect to consume all
41 // of the flow thread content. This is because it is always capable of generating an
42 // infinite number of boxes in order to hold all of the remaining content.
43 LayoutRect rect(flowThreadPortionRect());
45 // Get the offset within the flow thread in its block progression direction. Then get the
46 // flow thread's remaining logical height including its overflow and expand our rect
47 // to encompass that remaining height and overflow. The idea is that we will generate
48 // additional columns and pages to hold that overflow, since people do write bad
49 // content like <body style="height:0px"> in multi-column layouts.
50 bool isHorizontal = flowThread()->isHorizontalWritingMode();
51 LayoutUnit logicalTopOffset = isHorizontal ? rect.y() : rect.x();
52 LayoutRect layoutRect = flowThread()->layoutOverflowRect();
53 LayoutUnit logicalHeightWithOverflow = (isHorizontal ? layoutRect.maxY() : layoutRect.maxX()) - logicalTopOffset;
54 setFlowThreadPortionRect(LayoutRect(rect.x(), rect.y(), isHorizontal ? rect.width() : logicalHeightWithOverflow, isHorizontal ? logicalHeightWithOverflow : rect.height()));