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#ifndef CSSSelectorWatch_h
#define CSSSelectorWatch_h
#include "core/css/StyleRule.h"
#include "core/dom/DocumentSupplementable.h"
#include "platform/Timer.h"
#include "wtf/HashCountedSet.h"
#include "wtf/HashSet.h"
#include "wtf/RefPtr.h"
#include "wtf/Vector.h"
#include "wtf/WeakPtr.h"
#include "wtf/text/WTFString.h"
namespace WebCore {
class CSSSelectorWatch : public DocumentSupplement {
public:
virtual ~CSSSelectorWatch() { }
static CSSSelectorWatch& from(Document&);
void watchCSSSelectors(const Vector<String>& selectors);
const WillBeHeapVector<RefPtrWillBeMember<StyleRule> >& watchedCallbackSelectors() const { return m_watchedCallbackSelectors; }
void updateSelectorMatches(const Vector<String>& removedSelectors, const Vector<String>& addedSelectors);
private:
CSSSelectorWatch(Document&);
void callbackSelectorChangeTimerFired(Timer<CSSSelectorWatch>*);
Document& m_document;
WillBePersistentHeapVector<RefPtrWillBeMember<StyleRule> > m_watchedCallbackSelectors;
// Maps a CSS selector string with a -webkit-callback property to the number
// of matching RenderStyle objects in this document.
HashCountedSet<String> m_matchingCallbackSelectors;
// Selectors are relative to m_matchingCallbackSelectors's contents at
// the previous call to selectorMatchChanged.
HashSet<String> m_addedSelectors;
HashSet<String> m_removedSelectors;
Timer<CSSSelectorWatch> m_callbackSelectorChangeTimer;
// When an element is reparented, the new location's style is evaluated after the expriation of the relayout timer.
// We don't want to send redundant callbacks to the embedder, so this counter lets us wait another time around the event loop.
int m_timerExpirations;
};
} // namespace WebCore
#endif // CSSSelectorWatch_h