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27 #ifndef RenderRegionSet_h
28 #define RenderRegionSet_h
30 #include "core/rendering/RenderRegion.h"
34 class RenderFlowThread;
36 // RenderRegionSet represents a set of regions that all have the same width and height. It is a "composite region box" that
37 // can be used to represent a single run of contiguous regions.
39 // By combining runs of same-size columns or pages into a single object, we significantly reduce the number of unique RenderObjects
40 // required to represent those objects.
42 // This class is abstract and is only intended for use by renderers that generate anonymous runs of identical regions, i.e.,
43 // columns and printing. RenderMultiColumnSet and RenderPageSet represent runs of columns and pages respectively.
45 // FIXME: For now we derive from RenderRegion, but this may change at some point.
47 class RenderRegionSet : public RenderRegion {
49 RenderRegionSet(Element*, RenderFlowThread*);
52 virtual void expandToEncompassFlowThreadContentsIfNeeded() OVERRIDE FINAL;
54 virtual const char* renderName() const = 0;
57 } // namespace WebCore
59 #endif // RenderRegionSet_h