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#ifndef DescendantInvalidationSet_h
#define DescendantInvalidationSet_h
#include "wtf/Forward.h"
#include "wtf/HashSet.h"
#include "wtf/RefCounted.h"
#include "wtf/RefPtr.h"
#include "wtf/text/AtomicStringHash.h"
#include "wtf/text/StringHash.h"
namespace WebCore {
class Element;
// Tracks data to determine which elements of a DOM subtree need to have style
// recalculated.
class DescendantInvalidationSet FINAL : public RefCounted<DescendantInvalidationSet> {
public:
static PassRefPtr<DescendantInvalidationSet> create()
{
return adoptRef(new DescendantInvalidationSet);
}
void combine(const DescendantInvalidationSet& other);
void addClass(const AtomicString& className);
void addId(const AtomicString& id);
void addTagName(const AtomicString& tagName);
void addAttribute(const AtomicString& attributeLocalName);
// Appends the classes in this DescendantInvalidationSet to the vector.
void getClasses(Vector<AtomicString>& classes) const;
// Appends the attributes in this DescendantInvalidationSet to the vector.
void getAttributes(Vector<AtomicString>& attributes) const;
// Appends the ids in this DescendantInvalidationSet to the vector.
void getIds(Vector<AtomicString>& ids) const;
// Appends the tag names in this DescendantInvalidationSet to the vector.
void getTagNames(Vector<AtomicString>& tagNames) const;
void setWholeSubtreeInvalid();
bool wholeSubtreeInvalid() const { return m_allDescendantsMightBeInvalid; }
void setCustomPseudoInvalid() { m_customPseudoInvalid = true; }
bool customPseudoInvalid() const { return m_customPseudoInvalid; }
private:
DescendantInvalidationSet();
HashSet<AtomicString>& ensureClassSet();
HashSet<AtomicString>& ensureIdSet();
HashSet<AtomicString>& ensureTagNameSet();
HashSet<AtomicString>& ensureAttributeSet();
// If true, all descendants might be invalidated, so a full subtree recalc is required.
bool m_allDescendantsMightBeInvalid;
// If true, all descendants which are custom pseudo elements must be invalidated.
bool m_customPseudoInvalid;
// FIXME: optimize this if it becomes a memory issue.
OwnPtr<HashSet<AtomicString> > m_classes;
OwnPtr<HashSet<AtomicString> > m_ids;
OwnPtr<HashSet<AtomicString> > m_tagNames;
OwnPtr<HashSet<AtomicString> > m_attributes;
};
} // namespace WebCore
#endif // DescendantInvalidationSet_h