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, 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved. 6 * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/) 7 * 8 * This library is free software; you can redistribute it and/or 9 * modify it under the terms of the GNU Library General Public 10 * License as published by the Free Software Foundation; either 11 * version 2 of the License, or (at your option) any later version. 12 * 13 * This library is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 16 * Library General Public License for more details. 17 * 18 * You should have received a copy of the GNU Library General Public License 19 * along with this library; see the file COPYING.LIB. If not, write to 20 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, 21 * Boston, MA 02110-1301, USA. 22 * 23 */ 24 25 #ifndef Node_h 26 #define Node_h 27 28 #include "EventTarget.h" 29 #include "KURLHash.h" 30 #include "ScriptWrappable.h" 31 #include "TreeShared.h" 32 #include <wtf/ListHashSet.h> 33 34 namespace WebCore { 35 36 class AtomicString; 37 class Attribute; 38 class ContainerNode; 39 class Document; 40 class DynamicNodeList; 41 class Element; 42 class Event; 43 class EventListener; 44 class FloatPoint; 45 class Frame; 46 class IntRect; 47 class KeyboardEvent; 48 class NSResolver; 49 class NamedNodeMap; 50 class NodeList; 51 class NodeRareData; 52 class PlatformKeyboardEvent; 53 class PlatformMouseEvent; 54 class PlatformWheelEvent; 55 class QualifiedName; 56 class RegisteredEventListener; 57 class RenderArena; 58 class RenderBox; 59 class RenderBoxModelObject; 60 class RenderObject; 61 class RenderStyle; 62 class StringBuilder; 63 64 typedef int ExceptionCode; 65 66 // SyntheticStyleChange means that we need to go through the entire style change logic even though 67 // no style property has actually changed. It is used to restructure the tree when, for instance, 68 // RenderLayers are created or destroyed due to animation changes. 69 enum StyleChangeType { NoStyleChange, InlineStyleChange, FullStyleChange, SyntheticStyleChange }; 70 71 const unsigned short DOCUMENT_POSITION_EQUIVALENT = 0x00; 72 const unsigned short DOCUMENT_POSITION_DISCONNECTED = 0x01; 73 const unsigned short DOCUMENT_POSITION_PRECEDING = 0x02; 74 const unsigned short DOCUMENT_POSITION_FOLLOWING = 0x04; 75 const unsigned short DOCUMENT_POSITION_CONTAINS = 0x08; 76 const unsigned short DOCUMENT_POSITION_CONTAINED_BY = 0x10; 77 const unsigned short DOCUMENT_POSITION_IMPLEMENTATION_SPECIFIC = 0x20; 78 79 // this class implements nodes, which can have a parent but no children: 80 class Node : public EventTarget, public TreeShared<Node>, public ScriptWrappable { 81 friend class Document; 82 public: 83 enum NodeType { 84 ELEMENT_NODE = 1, 85 ATTRIBUTE_NODE = 2, 86 TEXT_NODE = 3, 87 CDATA_SECTION_NODE = 4, 88 ENTITY_REFERENCE_NODE = 5, 89 ENTITY_NODE = 6, 90 PROCESSING_INSTRUCTION_NODE = 7, 91 COMMENT_NODE = 8, 92 DOCUMENT_NODE = 9, 93 DOCUMENT_TYPE_NODE = 10, 94 DOCUMENT_FRAGMENT_NODE = 11, 95 NOTATION_NODE = 12, 96 XPATH_NAMESPACE_NODE = 13 97 }; 98 99 static bool isSupported(const String& feature, const String& version); 100 101 static void startIgnoringLeaks(); 102 static void stopIgnoringLeaks(); 103 104 static void dumpStatistics(); 105 106 enum StyleChange { NoChange, NoInherit, Inherit, Detach, Force }; 107 static StyleChange diff(const RenderStyle*, const RenderStyle*); 108 109 virtual ~Node(); 110 111 // DOM methods & attributes for Node 112 113 bool hasTagName(const QualifiedName&) const; 114 virtual String nodeName() const = 0; 115 virtual String nodeValue() const; 116 virtual void setNodeValue(const String&, ExceptionCode&); 117 virtual NodeType nodeType() const = 0; 118 Node* parentNode() const { return parent(); } 119 Element* parentElement() const; 120 Node* previousSibling() const { return m_previous; } 121 Node* nextSibling() const { return m_next; } 122 PassRefPtr<NodeList> childNodes(); 123 Node* firstChild() const { return isContainerNode() ? containerFirstChild() : 0; } 124 Node* lastChild() const { return isContainerNode() ? containerLastChild() : 0; } 125 bool hasAttributes() const; 126 NamedNodeMap* attributes() const; 127 128 virtual KURL baseURI() const; 129 130 void getSubresourceURLs(ListHashSet<KURL>&) const; 131 132 // These should all actually return a node, but this is only important for language bindings, 133 // which will already know and hold a ref on the right node to return. Returning bool allows 134 // these methods to be more efficient since they don't need to return a ref 135 virtual bool insertBefore(PassRefPtr<Node> newChild, Node* refChild, ExceptionCode&, bool shouldLazyAttach = false); 136 virtual bool replaceChild(PassRefPtr<Node> newChild, Node* oldChild, ExceptionCode&, bool shouldLazyAttach = false); 137 virtual bool removeChild(Node* child, ExceptionCode&); 138 virtual bool appendChild(PassRefPtr<Node> newChild, ExceptionCode&, bool shouldLazyAttach = false); 139 140 void remove(ExceptionCode&); 141 bool hasChildNodes() const { return firstChild(); } 142 virtual PassRefPtr<Node> cloneNode(bool deep) = 0; 143 const AtomicString& localName() const { return virtualLocalName(); } 144 const AtomicString& namespaceURI() const { return virtualNamespaceURI(); } 145 const AtomicString& prefix() const { return virtualPrefix(); } 146 virtual void setPrefix(const AtomicString&, ExceptionCode&); 147 void normalize(); 148 149 bool isSameNode(Node* other) const { return this == other; } 150 bool isEqualNode(Node*) const; 151 bool isDefaultNamespace(const AtomicString& namespaceURI) const; 152 String lookupPrefix(const AtomicString& namespaceURI) const; 153 String lookupNamespaceURI(const String& prefix) const; 154 String lookupNamespacePrefix(const AtomicString& namespaceURI, const Element* originalElement) const; 155 156 String textContent(bool convertBRsToNewlines = false) const; 157 void setTextContent(const String&, ExceptionCode&); 158 159 Node* lastDescendant() const; 160 Node* firstDescendant() const; 161 162 // Other methods (not part of DOM) 163 164 bool isElementNode() const { return m_isElement; } 165 bool isContainerNode() const { return m_isContainer; } 166 bool isTextNode() const { return m_isText; } 167 168 virtual bool isHTMLElement() const { return false; } 169 170 #if ENABLE(SVG) 171 virtual bool isSVGElement() const { return false; } 172 #else 173 static bool isSVGElement() { return false; } 174 #endif 175 176 #if ENABLE(WML) 177 virtual bool isWMLElement() const { return false; } 178 #else 179 static bool isWMLElement() { return false; } 180 #endif 181 182 #if ENABLE(MATHML) 183 virtual bool isMathMLElement() const { return false; } 184 #else 185 static bool isMathMLElement() { return false; } 186 #endif 187 188 189 virtual bool isMediaControlElement() const { return false; } 190 virtual bool isStyledElement() const { return false; } 191 virtual bool isFrameOwnerElement() const { return false; } 192 virtual bool isAttributeNode() const { return false; } 193 virtual bool isCommentNode() const { return false; } 194 virtual bool isCharacterDataNode() const { return false; } 195 bool isDocumentNode() const; 196 virtual bool isShadowNode() const { return false; } 197 virtual Node* shadowParentNode() { return 0; } 198 Node* shadowAncestorNode(); 199 Node* shadowTreeRootNode(); 200 bool isInShadowTree(); 201 202 // The node's parent for the purpose of event capture and bubbling. 203 virtual ContainerNode* eventParentNode(); 204 205 // Returns the enclosing event parent node (or self) that, when clicked, would trigger a navigation. 206 Node* enclosingLinkEventParentOrSelf(); 207 208 // Node ancestors when concerned about event flow 209 void eventAncestors(Vector<RefPtr<ContainerNode> > &ancestors); 210 211 bool isBlockFlow() const; 212 bool isBlockFlowOrBlockTable() const; 213 214 // These low-level calls give the caller responsibility for maintaining the integrity of the tree. 215 void setPreviousSibling(Node* previous) { m_previous = previous; } 216 void setNextSibling(Node* next) { m_next = next; } 217 218 // FIXME: These two functions belong in editing -- "atomic node" is an editing concept. 219 Node* previousNodeConsideringAtomicNodes() const; 220 Node* nextNodeConsideringAtomicNodes() const; 221 222 /** (Not part of the official DOM) 223 * Returns the next leaf node. 224 * 225 * Using this function delivers leaf nodes as if the whole DOM tree were a linear chain of its leaf nodes. 226 * @return next leaf node or 0 if there are no more. 227 */ 228 Node* nextLeafNode() const; 229 230 /** (Not part of the official DOM) 231 * Returns the previous leaf node. 232 * 233 * Using this function delivers leaf nodes as if the whole DOM tree were a linear chain of its leaf nodes. 234 * @return previous leaf node or 0 if there are no more. 235 */ 236 Node* previousLeafNode() const; 237 238 bool isEditableBlock() const; 239 240 // enclosingBlockFlowElement() is deprecated. Use enclosingBlock instead. 241 Element* enclosingBlockFlowElement() const; 242 243 Element* enclosingInlineElement() const; 244 Element* rootEditableElement() const; 245 246 bool inSameContainingBlockFlowElement(Node*); 247 248 // Used by the parser. Checks against the DTD, unlike DOM operations like appendChild(). 249 // Also does not dispatch DOM mutation events. 250 // Returns the appropriate container node for future insertions as you parse, or 0 for failure. 251 virtual ContainerNode* addChild(PassRefPtr<Node>); 252 253 // Called by the parser when this element's close tag is reached, 254 // signaling that all child tags have been parsed and added. 255 // This is needed for <applet> and <object> elements, which can't lay themselves out 256 // until they know all of their nested <param>s. [Radar 3603191, 4040848]. 257 // Also used for script elements and some SVG elements for similar purposes, 258 // but making parsing a special case in this respect should be avoided if possible. 259 virtual void finishParsingChildren() { } 260 virtual void beginParsingChildren() { } 261 262 // Called by the frame right before dispatching an unloadEvent. [Radar 4532113] 263 // This is needed for HTMLInputElements to tell the frame that it is done editing 264 // (sends textFieldDidEndEditing notification) 265 virtual void aboutToUnload() { } 266 267 // For <link> and <style> elements. 268 virtual bool sheetLoaded() { return true; } 269 270 bool hasID() const { return m_hasId; } 271 bool hasClass() const { return m_hasClass; } 272 bool active() const { return m_active; } 273 bool inActiveChain() const { return m_inActiveChain; } 274 bool inDetach() const { return m_inDetach; } 275 bool hovered() const { return m_hovered; } 276 bool focused() const { return hasRareData() ? rareDataFocused() : false; } 277 bool attached() const { return m_attached; } 278 void setAttached(bool b = true) { m_attached = b; } 279 bool needsStyleRecalc() const { return m_styleChange != NoStyleChange; } 280 StyleChangeType styleChangeType() const { return static_cast<StyleChangeType>(m_styleChange); } 281 bool childNeedsStyleRecalc() const { return m_childNeedsStyleRecalc; } 282 bool isLink() const { return m_isLink; } 283 void setHasID(bool b = true) { m_hasId = b; } 284 void setHasClass(bool b = true) { m_hasClass = b; } 285 void setChildNeedsStyleRecalc(bool b = true) { m_childNeedsStyleRecalc = b; } 286 void setInDocument(bool b = true) { m_inDocument = b; } 287 void setInActiveChain(bool b = true) { m_inActiveChain = b; } 288 void setNeedsStyleRecalc(StyleChangeType changeType = FullStyleChange); 289 void setIsLink(bool b = true) { m_isLink = b; } 290 291 void lazyAttach(); 292 virtual bool canLazyAttach(); 293 294 virtual void setFocus(bool b = true); 295 virtual void setActive(bool b = true, bool /*pause*/ = false) { m_active = b; } 296 virtual void setHovered(bool b = true) { m_hovered = b; } 297 298 virtual short tabIndex() const; 299 300 // Whether this kind of node can receive focus by default. Most nodes are 301 // not focusable but some elements, such as form controls and links are. 302 virtual bool supportsFocus() const; 303 // Whether the node can actually be focused. 304 virtual bool isFocusable() const; 305 virtual bool isKeyboardFocusable(KeyboardEvent*) const; 306 virtual bool isMouseFocusable() const; 307 308 virtual bool isContentEditable() const; 309 virtual bool isContentRichlyEditable() const; 310 virtual bool shouldUseInputMethod() const; 311 virtual IntRect getRect() const; 312 313 virtual void recalcStyle(StyleChange = NoChange) { } 314 315 unsigned nodeIndex() const; 316 317 // Returns the DOM ownerDocument attribute. This method never returns NULL, except in the case 318 // of (1) a Document node or (2) a DocumentType node that is not used with any Document yet. 319 virtual Document* ownerDocument() const; 320 321 // Returns the document associated with this node. This method never returns NULL, except in the case 322 // of a DocumentType node that is not used with any Document yet. A Document node returns itself. 323 Document* document() const 324 { 325 ASSERT(this); 326 ASSERT(m_document || (nodeType() == DOCUMENT_TYPE_NODE && !inDocument())); 327 return m_document; 328 } 329 void setDocument(Document*); 330 331 // Returns true if this node is associated with a document and is in its associated document's 332 // node tree, false otherwise. 333 bool inDocument() const 334 { 335 ASSERT(m_document || !m_inDocument); 336 return m_inDocument; 337 } 338 339 bool isReadOnlyNode() const { return nodeType() == ENTITY_REFERENCE_NODE; } 340 virtual bool childTypeAllowed(NodeType) { return false; } 341 unsigned childNodeCount() const { return isContainerNode() ? containerChildNodeCount() : 0; } 342 Node* childNode(unsigned index) const { return isContainerNode() ? containerChildNode(index) : 0; } 343 344 /** 345 * Does a pre-order traversal of the tree to find the node next node after this one. This uses the same order that 346 * the tags appear in the source file. 347 * 348 * @param stayWithin If not null, the traversal will stop once the specified node is reached. This can be used to 349 * restrict traversal to a particular sub-tree. 350 * 351 * @return The next node, in document order 352 * 353 * see @ref traversePreviousNode() 354 */ 355 Node* traverseNextNode(const Node* stayWithin = 0) const; 356 357 // Like traverseNextNode, but skips children and starts with the next sibling. 358 Node* traverseNextSibling(const Node* stayWithin = 0) const; 359 360 /** 361 * Does a reverse pre-order traversal to find the node that comes before the current one in document order 362 * 363 * see @ref traverseNextNode() 364 */ 365 Node* traversePreviousNode(const Node * stayWithin = 0) const; 366 367 // Like traverseNextNode, but visits parents after their children. 368 Node* traverseNextNodePostOrder() const; 369 370 // Like traversePreviousNode, but visits parents before their children. 371 Node* traversePreviousNodePostOrder(const Node *stayWithin = 0) const; 372 Node* traversePreviousSiblingPostOrder(const Node *stayWithin = 0) const; 373 374 /** 375 * Finds previous or next editable leaf node. 376 */ 377 Node* previousEditable() const; 378 Node* nextEditable() const; 379 380 RenderObject* renderer() const { return m_renderer; } 381 RenderObject* nextRenderer(); 382 RenderObject* previousRenderer(); 383 void setRenderer(RenderObject* renderer) { m_renderer = renderer; } 384 385 // Use these two methods with caution. 386 RenderBox* renderBox() const; 387 RenderBoxModelObject* renderBoxModelObject() const; 388 389 void checkSetPrefix(const AtomicString& prefix, ExceptionCode&); 390 bool isDescendantOf(const Node*) const; 391 bool contains(const Node*) const; 392 393 // These two methods are mutually exclusive. The former is used to do strict error-checking 394 // when adding children via the public DOM API (e.g., appendChild()). The latter is called only when parsing, 395 // to sanity-check against the DTD for error recovery. 396 void checkAddChild(Node* newChild, ExceptionCode&); // Error-checking when adding via the DOM API 397 virtual bool childAllowed(Node* newChild); // Error-checking during parsing that checks the DTD 398 399 void checkReplaceChild(Node* newChild, Node* oldChild, ExceptionCode&); 400 virtual bool canReplaceChild(Node* newChild, Node* oldChild); 401 402 // Used to determine whether range offsets use characters or node indices. 403 virtual bool offsetInCharacters() const; 404 // Number of DOM 16-bit units contained in node. Note that rendered text length can be different - e.g. because of 405 // css-transform:capitalize breaking up precomposed characters and ligatures. 406 virtual int maxCharacterOffset() const; 407 408 // FIXME: We should try to find a better location for these methods. 409 virtual bool canSelectAll() const { return false; } 410 virtual void selectAll() { } 411 412 // Whether or not a selection can be started in this object 413 virtual bool canStartSelection() const; 414 415 // Getting points into and out of screen space 416 FloatPoint convertToPage(const FloatPoint& p) const; 417 FloatPoint convertFromPage(const FloatPoint& p) const; 418 419 // ----------------------------------------------------------------------------- 420 // Integration with rendering tree 421 422 /** 423 * Attaches this node to the rendering tree. This calculates the style to be applied to the node and creates an 424 * appropriate RenderObject which will be inserted into the tree (except when the style has display: none). This 425 * makes the node visible in the FrameView. 426 */ 427 virtual void attach(); 428 429 /** 430 * Detaches the node from the rendering tree, making it invisible in the rendered view. This method will remove 431 * the node's rendering object from the rendering tree and delete it. 432 */ 433 virtual void detach(); 434 435 virtual void willRemove(); 436 void createRendererIfNeeded(); 437 PassRefPtr<RenderStyle> styleForRenderer(); 438 virtual bool rendererIsNeeded(RenderStyle*); 439 #if ENABLE(SVG) || ENABLE(XHTMLMP) 440 virtual bool childShouldCreateRenderer(Node*) const { return true; } 441 #endif 442 virtual RenderObject* createRenderer(RenderArena*, RenderStyle*); 443 444 // Wrapper for nodes that don't have a renderer, but still cache the style (like HTMLOptionElement). 445 RenderStyle* renderStyle() const; 446 virtual void setRenderStyle(PassRefPtr<RenderStyle>); 447 448 virtual RenderStyle* computedStyle(); 449 450 // ----------------------------------------------------------------------------- 451 // Notification of document structure changes 452 453 /** 454 * Notifies the node that it has been inserted into the document. This is called during document parsing, and also 455 * when a node is added through the DOM methods insertBefore(), appendChild() or replaceChild(). Note that this only 456 * happens when the node becomes part of the document tree, i.e. only when the document is actually an ancestor of 457 * the node. The call happens _after_ the node has been added to the tree. 458 * 459 * This is similar to the DOMNodeInsertedIntoDocument DOM event, but does not require the overhead of event 460 * dispatching. 461 */ 462 virtual void insertedIntoDocument(); 463 464 /** 465 * Notifies the node that it is no longer part of the document tree, i.e. when the document is no longer an ancestor 466 * node. 467 * 468 * This is similar to the DOMNodeRemovedFromDocument DOM event, but does not require the overhead of event 469 * dispatching, and is called _after_ the node is removed from the tree. 470 */ 471 virtual void removedFromDocument(); 472 473 // These functions are called whenever you are connected or disconnected from a tree. That tree may be the main 474 // document tree, or it could be another disconnected tree. Override these functions to do any work that depends 475 // on connectedness to some ancestor (e.g., an ancestor <form> for example). 476 virtual void insertedIntoTree(bool /*deep*/) { } 477 virtual void removedFromTree(bool /*deep*/) { } 478 479 /** 480 * Notifies the node that it's list of children have changed (either by adding or removing child nodes), or a child 481 * node that is of the type CDATA_SECTION_NODE, TEXT_NODE or COMMENT_NODE has changed its value. 482 */ 483 virtual void childrenChanged(bool /*changedByParser*/ = false, Node* /*beforeChange*/ = 0, Node* /*afterChange*/ = 0, int /*childCountDelta*/ = 0) { } 484 485 #if !defined(NDEBUG) || defined(ANDROID_DOM_LOGGING) 486 virtual void formatForDebugger(char* buffer, unsigned length) const; 487 488 void showNode(const char* prefix = "") const; 489 void showTreeForThis() const; 490 void showTreeAndMark(const Node* markedNode1, const char* markedLabel1, const Node* markedNode2 = 0, const char* markedLabel2 = 0) const; 491 #endif 492 493 void registerDynamicNodeList(DynamicNodeList*); 494 void unregisterDynamicNodeList(DynamicNodeList*); 495 void notifyNodeListsChildrenChanged(); 496 void notifyLocalNodeListsChildrenChanged(); 497 void notifyNodeListsAttributeChanged(); 498 void notifyLocalNodeListsAttributeChanged(); 499 500 PassRefPtr<NodeList> getElementsByTagName(const String&); 501 PassRefPtr<NodeList> getElementsByTagNameNS(const AtomicString& namespaceURI, const String& localName); 502 PassRefPtr<NodeList> getElementsByName(const String& elementName); 503 PassRefPtr<NodeList> getElementsByClassName(const String& classNames); 504 505 PassRefPtr<Element> querySelector(const String& selectors, ExceptionCode&); 506 PassRefPtr<NodeList> querySelectorAll(const String& selectors, ExceptionCode&); 507 508 unsigned short compareDocumentPosition(Node*); 509 510 #ifdef ANDROID_INSTRUMENT 511 // Overridden to prevent the normal new from being called. 512 void* operator new(size_t size); 513 void* operator new[](size_t size); 514 515 // Overridden to prevent the normal delete from being called. 516 void operator delete(void* p, size_t size); 517 void operator delete[](void* p, size_t size); 518 519 static size_t reportDOMNodesSize(); 520 #endif 521 522 virtual Node* toNode() { return this; } 523 524 virtual ScriptExecutionContext* scriptExecutionContext() const; 525 526 virtual bool addEventListener(const AtomicString& eventType, PassRefPtr<EventListener>, bool useCapture); 527 virtual bool removeEventListener(const AtomicString& eventType, EventListener*, bool useCapture); 528 529 // Handlers to do/undo actions on the target node before an event is dispatched to it and after the event 530 // has been dispatched. The data pointer is handed back by the preDispatch and passed to postDispatch. 531 virtual void* preDispatchEventHandler(Event*) { return 0; } 532 virtual void postDispatchEventHandler(Event*, void* /*dataFromPreDispatch*/) { } 533 534 using EventTarget::dispatchEvent; 535 virtual bool dispatchEvent(PassRefPtr<Event>); 536 537 bool dispatchGenericEvent(PassRefPtr<Event>); 538 virtual void handleLocalEvents(Event*); 539 540 void dispatchSubtreeModifiedEvent(); 541 void dispatchUIEvent(const AtomicString& eventType, int detail, PassRefPtr<Event> underlyingEvent); 542 bool dispatchKeyEvent(const PlatformKeyboardEvent&); 543 void dispatchWheelEvent(PlatformWheelEvent&); 544 bool dispatchMouseEvent(const PlatformMouseEvent&, const AtomicString& eventType, 545 int clickCount = 0, Node* relatedTarget = 0); 546 bool dispatchMouseEvent(const AtomicString& eventType, int button, int clickCount, 547 int pageX, int pageY, int screenX, int screenY, 548 bool ctrlKey, bool altKey, bool shiftKey, bool metaKey, 549 bool isSimulated, Node* relatedTarget, PassRefPtr<Event> underlyingEvent); 550 void dispatchSimulatedMouseEvent(const AtomicString& eventType, PassRefPtr<Event> underlyingEvent); 551 void dispatchSimulatedClick(PassRefPtr<Event> underlyingEvent, bool sendMouseEvents = false, bool showPressedLook = true); 552 553 virtual void dispatchFocusEvent(); 554 virtual void dispatchBlurEvent(); 555 556 /** 557 * Perform the default action for an event e.g. submitting a form 558 */ 559 virtual void defaultEventHandler(Event*); 560 561 /** 562 * Used for disabled form elements; if true, prevents mouse events from being dispatched 563 * to event listeners, and prevents DOMActivate events from being sent at all. 564 */ 565 virtual bool disabled() const; 566 567 using TreeShared<Node>::ref; 568 using TreeShared<Node>::deref; 569 570 virtual EventTargetData* eventTargetData(); 571 virtual EventTargetData* ensureEventTargetData(); 572 573 protected: 574 // CreateElementZeroRefCount is deprecated and can be removed once we convert all element 575 // classes to start with a reference count of 1. 576 enum ConstructionType { CreateContainer, CreateElement, CreateOther, CreateText, CreateElementZeroRefCount }; 577 Node(Document*, ConstructionType); 578 579 virtual void willMoveToNewOwnerDocument(); 580 virtual void didMoveToNewOwnerDocument(); 581 582 virtual void addSubresourceAttributeURLs(ListHashSet<KURL>&) const { } 583 void setTabIndexExplicitly(short); 584 585 bool hasRareData() const { return m_hasRareData; } 586 #if ENABLE(SVG) 587 bool hasRareSVGData() const { return m_hasRareSVGData; } 588 #endif 589 590 NodeRareData* rareData() const; 591 NodeRareData* ensureRareData(); 592 593 private: 594 static bool initialRefCount(ConstructionType); 595 static bool isContainer(ConstructionType); 596 static bool isElement(ConstructionType); 597 static bool isText(ConstructionType); 598 599 virtual void refEventTarget() { ref(); } 600 virtual void derefEventTarget() { deref(); } 601 602 void removeAllEventListenersSlowCase(); 603 604 virtual NodeRareData* createRareData(); 605 Node* containerChildNode(unsigned index) const; 606 unsigned containerChildNodeCount() const; 607 Node* containerFirstChild() const; 608 Node* containerLastChild() const; 609 bool rareDataFocused() const; 610 611 virtual RenderStyle* nonRendererRenderStyle() const; 612 613 virtual const AtomicString& virtualPrefix() const; 614 virtual const AtomicString& virtualLocalName() const; 615 virtual const AtomicString& virtualNamespaceURI() const; 616 617 Element* ancestorElement() const; 618 619 void appendTextContent(bool convertBRsToNewlines, StringBuilder&) const; 620 621 Document* m_document; 622 Node* m_previous; 623 Node* m_next; 624 RenderObject* m_renderer; 625 626 unsigned m_styleChange : 2; 627 bool m_hasId : 1; 628 bool m_hasClass : 1; 629 bool m_attached : 1; 630 bool m_childNeedsStyleRecalc : 1; 631 bool m_inDocument : 1; 632 bool m_isLink : 1; 633 bool m_active : 1; 634 bool m_hovered : 1; 635 bool m_inActiveChain : 1; 636 bool m_inDetach : 1; 637 bool m_hasRareData : 1; 638 const bool m_isElement : 1; 639 const bool m_isContainer : 1; 640 const bool m_isText : 1; 641 642 protected: 643 // These bits are used by derived classes, pulled up here so they can 644 // be stored in the same memory word as the Node bits above. 645 646 bool m_parsingChildrenFinished : 1; // Element 647 mutable bool m_isStyleAttributeValid : 1; // StyledElement 648 mutable bool m_synchronizingStyleAttribute : 1; // StyledElement 649 650 #if ENABLE(SVG) 651 mutable bool m_areSVGAttributesValid : 1; // Element 652 mutable bool m_synchronizingSVGAttributes : 1; // SVGElement 653 bool m_hasRareSVGData : 1; // SVGElement 654 #endif 655 656 // 10 bits remaining 657 }; 658 659 // Used in Node::addSubresourceAttributeURLs() and in addSubresourceStyleURLs() 660 inline void addSubresourceURL(ListHashSet<KURL>& urls, const KURL& url) 661 { 662 if (!url.isNull()) 663 urls.add(url); 664 } 665 666 } //namespace 667 668 #ifndef NDEBUG 669 // Outside the WebCore namespace for ease of invocation from gdb. 670 void showTree(const WebCore::Node*); 671 #endif 672 673 #endif 674
