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31 #ifndef DescendantInvalidationSet_h
32 #define DescendantInvalidationSet_h
34 #include "wtf/Forward.h"
35 #include "wtf/HashSet.h"
36 #include "wtf/RefCounted.h"
37 #include "wtf/RefPtr.h"
38 #include "wtf/text/AtomicStringHash.h"
39 #include "wtf/text/StringHash.h"
45 // Tracks data to determine which elements of a DOM subtree need to have style
47 class DescendantInvalidationSet FINAL : public RefCounted<DescendantInvalidationSet> {
49 static PassRefPtr<DescendantInvalidationSet> create()
51 return adoptRef(new DescendantInvalidationSet);
54 void combine(const DescendantInvalidationSet& other);
56 void addClass(const AtomicString& className);
57 void addId(const AtomicString& id);
58 void addTagName(const AtomicString& tagName);
60 // Appends the classes in this DescendantInvalidationSet to the vector.
61 void getClasses(Vector<AtomicString>& classes);
63 void setWholeSubtreeInvalid() { m_allDescendantsMightBeInvalid = true; };
64 bool wholeSubtreeInvalid() { return m_allDescendantsMightBeInvalid; }
66 DescendantInvalidationSet();
68 bool invalidateElementSubtreeInternal(Element*);
69 // If true, all descendants might be invalidated, so a full subtree recalc is required.
70 bool m_allDescendantsMightBeInvalid;
72 // FIXME: optimize this if it becomes a memory issue.
73 HashSet<AtomicString> m_classes;
74 HashSet<AtomicString> m_ids;
75 HashSet<AtomicString> m_tagNames;
78 } // namespace WebCore
80 #endif // DescendantInvalidationSet_h