1 /* 2 * Copyright (C) 1999 Lars Knoll (knoll (at) kde.org) 3 * (C) 1999 Antti Koivisto (koivisto (at) kde.org) 4 * (C) 2001 Dirk Mueller (mueller (at) kde.org) 5 * Copyright (C) 2004, 2006, 2007 Apple Inc. All rights reserved. 6 * 7 * This library is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU Library General Public 9 * License as published by the Free Software Foundation; either 10 * version 2 of the License, or (at your option) any later version. 11 * 12 * This library is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 15 * Library General Public License for more details. 16 * 17 * You should have received a copy of the GNU Library General Public License 18 * along with this library; see the file COPYING.LIB. If not, write to 19 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, 20 * Boston, MA 02110-1301, USA. 21 * 22 */ 23 24 #ifndef LiveNodeList_h 25 #define LiveNodeList_h 26 27 #include "core/dom/LiveNodeListBase.h" 28 #include "core/dom/NodeList.h" 29 #include "core/html/CollectionIndexCache.h" 30 #include "core/html/CollectionType.h" 31 #include "platform/heap/Handle.h" 32 #include "wtf/PassRefPtr.h" 33 34 namespace WebCore { 35 36 class Element; 37 38 class LiveNodeList : public NodeList, public LiveNodeListBase { 39 WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(LiveNodeList); 40 public: 41 LiveNodeList(ContainerNode& ownerNode, CollectionType collectionType, NodeListInvalidationType invalidationType, NodeListRootType rootType = NodeListIsRootedAtNode) 42 : LiveNodeListBase(ownerNode, rootType, invalidationType, collectionType) { } 43 44 virtual unsigned length() const OVERRIDE FINAL { return m_collectionIndexCache.nodeCount(*this); } 45 virtual Element* item(unsigned offset) const OVERRIDE FINAL { return m_collectionIndexCache.nodeAt(*this, offset); } 46 virtual bool elementMatches(const Element&) const = 0; 47 48 virtual void invalidateCache(Document* oldDocument = 0) const OVERRIDE FINAL; 49 void invalidateCacheForAttribute(const QualifiedName*) const; 50 51 bool shouldOnlyIncludeDirectChildren() const { return false; } 52 53 // Collection IndexCache API. 54 bool canTraverseBackward() const { return true; } 55 Element* traverseToFirstElement() const; 56 Element* traverseToLastElement() const; 57 Element* traverseForwardToOffset(unsigned offset, Element& currentNode, unsigned& currentOffset) const; 58 Element* traverseBackwardToOffset(unsigned offset, Element& currentNode, unsigned& currentOffset) const; 59 60 virtual void trace(Visitor*) OVERRIDE; 61 62 private: 63 virtual Node* virtualOwnerNode() const OVERRIDE FINAL; 64 65 mutable CollectionIndexCache<LiveNodeList, Element> m_collectionIndexCache; 66 }; 67 68 DEFINE_TYPE_CASTS(LiveNodeList, LiveNodeListBase, list, isLiveNodeListType(list->type()), isLiveNodeListType(list.type())); 69 70 inline void LiveNodeList::invalidateCacheForAttribute(const QualifiedName* attrName) const 71 { 72 if (!attrName || shouldInvalidateTypeOnAttributeChange(invalidationType(), *attrName)) 73 invalidateCache(); 74 } 75 76 } // namespace WebCore 77 78 #endif // LiveNodeList_h 79