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31 #ifndef DescendantInvalidationSet_h
32 #define DescendantInvalidationSet_h
34 #include "platform/heap/Handle.h"
35 #include "wtf/Forward.h"
36 #include "wtf/HashSet.h"
37 #include "wtf/RefCounted.h"
38 #include "wtf/RefPtr.h"
39 #include "wtf/text/AtomicStringHash.h"
40 #include "wtf/text/StringHash.h"
47 // Tracks data to determine which elements of a DOM subtree need to have style
49 class DescendantInvalidationSet final : public RefCountedWillBeGarbageCollected<DescendantInvalidationSet> {
51 static PassRefPtrWillBeRawPtr<DescendantInvalidationSet> create()
53 return adoptRefWillBeNoop(new DescendantInvalidationSet);
56 static void cacheTracingFlag();
58 bool invalidatesElement(Element&) const;
60 void combine(const DescendantInvalidationSet& other);
62 void addClass(const AtomicString& className);
63 void addId(const AtomicString& id);
64 void addTagName(const AtomicString& tagName);
65 void addAttribute(const AtomicString& attributeLocalName);
67 void setWholeSubtreeInvalid();
68 bool wholeSubtreeInvalid() const { return m_allDescendantsMightBeInvalid; }
70 void setTreeBoundaryCrossing() { m_treeBoundaryCrossing = true; }
71 bool treeBoundaryCrossing() const { return m_treeBoundaryCrossing; }
73 void setInsertionPointCrossing() { m_insertionPointCrossing = true; }
74 bool insertionPointCrossing() const { return m_insertionPointCrossing; }
76 void setCustomPseudoInvalid() { m_customPseudoInvalid = true; }
77 bool customPseudoInvalid() const { return m_customPseudoInvalid; }
79 bool isEmpty() const { return !m_classes && !m_ids && !m_tagNames && !m_attributes; }
83 void toTracedValue(TracedValue*) const;
90 DescendantInvalidationSet();
92 WillBeHeapHashSet<AtomicString>& ensureClassSet();
93 WillBeHeapHashSet<AtomicString>& ensureIdSet();
94 WillBeHeapHashSet<AtomicString>& ensureTagNameSet();
95 WillBeHeapHashSet<AtomicString>& ensureAttributeSet();
97 // FIXME: optimize this if it becomes a memory issue.
98 OwnPtrWillBeMember<WillBeHeapHashSet<AtomicString> > m_classes;
99 OwnPtrWillBeMember<WillBeHeapHashSet<AtomicString> > m_ids;
100 OwnPtrWillBeMember<WillBeHeapHashSet<AtomicString> > m_tagNames;
101 OwnPtrWillBeMember<WillBeHeapHashSet<AtomicString> > m_attributes;
103 // If true, all descendants might be invalidated, so a full subtree recalc is required.
104 unsigned m_allDescendantsMightBeInvalid : 1;
106 // If true, all descendants which are custom pseudo elements must be invalidated.
107 unsigned m_customPseudoInvalid : 1;
109 // If true, the invalidation must traverse into ShadowRoots with this set.
110 unsigned m_treeBoundaryCrossing : 1;
112 // If true, insertion point descendants must be invalidated.
113 unsigned m_insertionPointCrossing : 1;
118 #endif // DescendantInvalidationSet_h