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31 #ifndef CSSSelectorWatch_h
32 #define CSSSelectorWatch_h
34 #include "core/css/StyleRule.h"
35 #include "core/dom/DocumentSupplementable.h"
36 #include "platform/Timer.h"
37 #include "wtf/HashCountedSet.h"
38 #include "wtf/HashSet.h"
39 #include "wtf/RefPtr.h"
40 #include "wtf/Vector.h"
41 #include "wtf/WeakPtr.h"
42 #include "wtf/text/WTFString.h"
46 class CSSSelectorWatch FINAL : public NoBaseWillBeGarbageCollectedFinalized<CSSSelectorWatch>, public DocumentSupplement {
47 WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(CSSSelectorWatch);
49 virtual ~CSSSelectorWatch() { }
51 static CSSSelectorWatch& from(Document&);
53 void watchCSSSelectors(const Vector<String>& selectors);
54 const WillBeHeapVector<RefPtrWillBeMember<StyleRule> >& watchedCallbackSelectors() const { return m_watchedCallbackSelectors; }
56 void updateSelectorMatches(const Vector<String>& removedSelectors, const Vector<String>& addedSelectors);
58 virtual void trace(Visitor*) OVERRIDE;
61 explicit CSSSelectorWatch(Document&);
62 void callbackSelectorChangeTimerFired(Timer<CSSSelectorWatch>*);
63 Document& document() const { return *m_document; }
65 RawPtrWillBeMember<Document> m_document;
67 WillBeHeapVector<RefPtrWillBeMember<StyleRule> > m_watchedCallbackSelectors;
69 // Maps a CSS selector string with a -webkit-callback property to the number
70 // of matching RenderStyle objects in this document.
71 HashCountedSet<String> m_matchingCallbackSelectors;
72 // Selectors are relative to m_matchingCallbackSelectors's contents at
73 // the previous call to selectorMatchChanged.
74 HashSet<String> m_addedSelectors;
75 HashSet<String> m_removedSelectors;
77 Timer<CSSSelectorWatch> m_callbackSelectorChangeTimer;
79 // When an element is reparented, the new location's style is evaluated after the expriation of the relayout timer.
80 // We don't want to send redundant callbacks to the embedder, so this counter lets us wait another time around the event loop.
81 int m_timerExpirations;
86 #endif // CSSSelectorWatch_h