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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 bool invalidatesElement(Element&) const;
56 void combine(const DescendantInvalidationSet& other);
58 void addClass(const AtomicString& className);
59 void addId(const AtomicString& id);
60 void addTagName(const AtomicString& tagName);
61 void addAttribute(const AtomicString& attributeLocalName);
63 void setWholeSubtreeInvalid();
64 bool wholeSubtreeInvalid() const { return m_allDescendantsMightBeInvalid; }
66 void setCustomPseudoInvalid() { m_customPseudoInvalid = true; }
67 bool customPseudoInvalid() const { return m_customPseudoInvalid; }
69 bool isEmpty() const { return !m_classes && !m_ids && !m_tagNames && !m_attributes; }
72 DescendantInvalidationSet();
74 HashSet<AtomicString>& ensureClassSet();
75 HashSet<AtomicString>& ensureIdSet();
76 HashSet<AtomicString>& ensureTagNameSet();
77 HashSet<AtomicString>& ensureAttributeSet();
79 // If true, all descendants might be invalidated, so a full subtree recalc is required.
80 bool m_allDescendantsMightBeInvalid;
82 // If true, all descendants which are custom pseudo elements must be invalidated.
83 bool m_customPseudoInvalid;
85 // FIXME: optimize this if it becomes a memory issue.
86 OwnPtr<HashSet<AtomicString> > m_classes;
87 OwnPtr<HashSet<AtomicString> > m_ids;
88 OwnPtr<HashSet<AtomicString> > m_tagNames;
89 OwnPtr<HashSet<AtomicString> > m_attributes;
92 } // namespace WebCore
94 #endif // DescendantInvalidationSet_h