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28 #if ENABLE(LAYOUT_FORMATTING_CONTEXT)
30 #include "FormattingContext.h"
31 #include "FormattingState.h"
32 #include "LayoutBox.h"
33 #include <wtf/IsoMalloc.h>
45 // LayoutContext is the entry point for layout. It takes a (formatting root)container which acts as the root of the layout context.
46 // LayoutContext::layout() generates the display tree for the root container's subtree (it does not run layout on the root though).
47 // Note, while the root container is suppposed to be the entry point for the initial layout, it does not necessarily need to be the entry point of any
48 // subsequent layouts (subtree layout).
49 // LayoutContext also holds the formatting states. They cache formatting context specific data to enable performant incremental layouts.
51 WTF_MAKE_ISO_ALLOCATED(LayoutContext);
53 LayoutContext(const Box& root);
57 Display::Box& createDisplayBox(const Box&);
58 Display::Box* displayBoxForLayoutBox(const Box& layoutBox) const { return m_layoutToDisplayBox.get(&layoutBox); }
60 void markNeedsLayout(const Box&, StyleDiff);
61 bool needsLayout(const Box&) const;
63 FormattingState& formattingStateForBox(const Box&) const;
64 FormattingState& establishedFormattingState(const Box& formattingContextRoot, const FormattingContext&);
65 std::unique_ptr<FormattingContext> formattingContext(const Box& formattingContextRoot);
69 HashMap<const Box*, std::unique_ptr<FormattingState>> m_formattingStates;
70 HashMap<const Box*, std::unique_ptr<Display::Box>> m_layoutToDisplayBox;