node.h

linux下开源浏览器WebKit的源码,市面上的很多商用浏览器都是移植自WebKit

    Node* previousEditable() const;
    Node* nextEditable() const;

    RenderObject* renderer() const { return m_renderer; }
    RenderObject* nextRenderer();
    RenderObject* previousRenderer();
    void setRenderer(RenderObject* renderer) { m_renderer = renderer; }
    
    // Use these two methods with caution.
    RenderBox* renderBox() const;
    RenderBoxModelObject* renderBoxModelObject() const;

    void checkSetPrefix(const AtomicString& prefix, ExceptionCode&);
    bool isDescendantOf(const Node*) const;
    bool contains(const Node*) const;

    // These two methods are mutually exclusive.  The former is used to do strict error-checking
    // when adding children via the public DOM API (e.g., appendChild()).  The latter is called only when parsing, 
    // to sanity-check against the DTD for error recovery.
    void checkAddChild(Node* newChild, ExceptionCode&); // Error-checking when adding via the DOM API
    virtual bool childAllowed(Node* newChild);          // Error-checking during parsing that checks the DTD

    void checkReplaceChild(Node* newChild, Node* oldChild, ExceptionCode&);
    virtual bool canReplaceChild(Node* newChild, Node* oldChild);
    
    // Used to determine whether range offsets use characters or node indices.
    virtual bool offsetInCharacters() const;
    // Number of DOM 16-bit units contained in node. Note that rendered text length can be different - e.g. because of
    // css-transform:capitalize breaking up precomposed characters and ligatures.
    virtual int maxCharacterOffset() const;
    
    // FIXME: We should try to find a better location for these methods.
    virtual bool canSelectAll() const { return false; }
    virtual void selectAll() { }

    // Whether or not a selection can be started in this object
    virtual bool canStartSelection() const;

    // Getting points into and out of screen space
    FloatPoint convertToPage(const FloatPoint& p) const;
    FloatPoint convertFromPage(const FloatPoint& p) const;

    // -----------------------------------------------------------------------------
    // Integration with rendering tree

    /**
     * Attaches this node to the rendering tree. This calculates the style to be applied to the node and creates an
     * appropriate RenderObject which will be inserted into the tree (except when the style has display: none). This
     * makes the node visible in the FrameView.
     */
    virtual void attach();

    /**
     * Detaches the node from the rendering tree, making it invisible in the rendered view. This method will remove
     * the node's rendering object from the rendering tree and delete it.
     */
    virtual void detach();

    virtual void willRemove();
    void createRendererIfNeeded();
    PassRefPtr<RenderStyle> styleForRenderer();
    virtual bool rendererIsNeeded(RenderStyle*);
#if ENABLE(SVG)
    virtual bool childShouldCreateRenderer(Node*) const { return true; }
#endif
    virtual RenderObject* createRenderer(RenderArena*, RenderStyle*);
    
    // Wrapper for nodes that don't have a renderer, but still cache the style (like HTMLOptionElement).
    RenderStyle* renderStyle() const;
    virtual void setRenderStyle(PassRefPtr<RenderStyle>);

    virtual RenderStyle* computedStyle();

    // -----------------------------------------------------------------------------
    // Notification of document structure changes

    /**
     * Notifies the node that it has been inserted into the document. This is called during document parsing, and also
     * when a node is added through the DOM methods insertBefore(), appendChild() or replaceChild(). Note that this only
     * happens when the node becomes part of the document tree, i.e. only when the document is actually an ancestor of
     * the node. The call happens _after_ the node has been added to the tree.
     *
     * This is similar to the DOMNodeInsertedIntoDocument DOM event, but does not require the overhead of event
     * dispatching.
     */
    virtual void insertedIntoDocument();

    /**
     * Notifies the node that it is no longer part of the document tree, i.e. when the document is no longer an ancestor
     * node.
     *
     * This is similar to the DOMNodeRemovedFromDocument DOM event, but does not require the overhead of event
     * dispatching, and is called _after_ the node is removed from the tree.
     */
    virtual void removedFromDocument();

    // These functions are called whenever you are connected or disconnected from a tree.  That tree may be the main
    // document tree, or it could be another disconnected tree.  Override these functions to do any work that depends
    // on connectedness to some ancestor (e.g., an ancestor <form> for example).
    virtual void insertedIntoTree(bool /*deep*/) { }
    virtual void removedFromTree(bool /*deep*/) { }

    /**
     * Notifies the node that it's list of children have changed (either by adding or removing child nodes), or a child
     * node that is of the type CDATA_SECTION_NODE, TEXT_NODE or COMMENT_NODE has changed its value.
     */
    virtual void childrenChanged(bool /*changedByParser*/ = false, Node* /*beforeChange*/ = 0, Node* /*afterChange*/ = 0, int /*childCountDelta*/ = 0) { }

#ifndef NDEBUG
    virtual void formatForDebugger(char* buffer, unsigned length) const;

    void showNode(const char* prefix = "") const;
    void showTreeForThis() const;
    void showTreeAndMark(const Node* markedNode1, const char* markedLabel1, const Node* markedNode2 = 0, const char* markedLabel2 = 0) const;
#endif

    void registerDynamicNodeList(DynamicNodeList*);
    void unregisterDynamicNodeList(DynamicNodeList*);
    void notifyNodeListsChildrenChanged();
    void notifyLocalNodeListsChildrenChanged();
    void notifyNodeListsAttributeChanged();
    void notifyLocalNodeListsAttributeChanged();
    
    PassRefPtr<NodeList> getElementsByTagName(const String&);
    PassRefPtr<NodeList> getElementsByTagNameNS(const AtomicString& namespaceURI, const String& localName);
    PassRefPtr<NodeList> getElementsByName(const String& elementName);
    PassRefPtr<NodeList> getElementsByClassName(const String& classNames);

    PassRefPtr<Element> querySelector(const String& selectors, ExceptionCode&);
    PassRefPtr<NodeList> querySelectorAll(const String& selectors, ExceptionCode&);

    unsigned short compareDocumentPosition(Node*);

protected:
    virtual void willMoveToNewOwnerDocument();
    virtual void didMoveToNewOwnerDocument();
    
    virtual void addSubresourceAttributeURLs(ListHashSet<KURL>&) const { }
    void setTabIndexExplicitly(short);
    
    bool hasRareData() const { return m_hasRareData; }
    
    NodeRareData* rareData() const;
    NodeRareData* ensureRareData();

public:
    virtual Node* toNode() { return this; }

    virtual ScriptExecutionContext* scriptExecutionContext() const;

    virtual void addEventListener(const AtomicString& eventType, PassRefPtr<EventListener>, bool useCapture);
    virtual void removeEventListener(const AtomicString& eventType, EventListener*, bool useCapture);
    virtual bool dispatchEvent(PassRefPtr<Event>, ExceptionCode&);
    void removeAllEventListeners() { if (hasRareData()) removeAllEventListenersSlowCase(); }

    void setInlineEventListenerForType(const AtomicString& eventType, PassRefPtr<EventListener>);
    void setInlineEventListenerForTypeAndAttribute(const AtomicString& eventType, Attribute*);
    void removeInlineEventListenerForType(const AtomicString& eventType);
    bool dispatchEventForType(const AtomicString& eventType, bool canBubble, bool cancelable);
    EventListener* inlineEventListenerForType(const AtomicString& eventType) const;

    bool dispatchSubtreeModifiedEvent();
    void dispatchWindowEvent(PassRefPtr<Event>);
    void dispatchWindowEvent(const AtomicString& eventType, bool canBubble, bool cancelable);
    bool dispatchUIEvent(const AtomicString& eventType, int detail = 0, PassRefPtr<Event> underlyingEvent = 0);
    bool dispatchKeyEvent(const PlatformKeyboardEvent&);
    void dispatchWheelEvent(PlatformWheelEvent&);
    bool dispatchMouseEvent(const PlatformMouseEvent&, const AtomicString& eventType,
        int clickCount = 0, Node* relatedTarget = 0);
    bool dispatchMouseEvent(const AtomicString& eventType, int button, int clickCount,
        int pageX, int pageY, int screenX, int screenY,
        bool ctrlKey, bool altKey, bool shiftKey, bool metaKey,
        bool isSimulated = false, Node* relatedTarget = 0, PassRefPtr<Event> underlyingEvent = 0);
    void dispatchSimulatedMouseEvent(const AtomicString& eventType, PassRefPtr<Event> underlyingEvent = 0);
    void dispatchSimulatedClick(PassRefPtr<Event> underlyingEvent, bool sendMouseEvents = false, bool showPressedLook = true);
    bool dispatchProgressEvent(const AtomicString &eventType, bool lengthComputableArg, unsigned loadedArg, unsigned totalArg);
    void dispatchStorageEvent(const AtomicString &eventType, const String& key, const String& oldValue, const String& newValue, Frame* source);
    bool dispatchWebKitAnimationEvent(const AtomicString& eventType, const String& animationName, double elapsedTime);
    bool dispatchWebKitTransitionEvent(const AtomicString& eventType, const String& propertyName, double elapsedTime);
    bool dispatchGenericEvent(PassRefPtr<Event>);

    virtual void handleLocalEvents(Event*, bool useCapture);

    virtual void dispatchFocusEvent();
    virtual void dispatchBlurEvent();

    /**
     * Perform the default action for an event e.g. submitting a form
     */
    virtual void defaultEventHandler(Event*);

    /**
     * Used for disabled form elements; if true, prevents mouse events from being dispatched
     * to event listeners, and prevents DOMActivate events from being sent at all.
     */
    virtual bool disabled() const;

    const RegisteredEventListenerVector& eventListeners() const;

    EventListener* onabort() const;
    void setOnabort(PassRefPtr<EventListener>);
    EventListener* onblur() const;
    void setOnblur(PassRefPtr<EventListener>);
    EventListener* onchange() const;
    void setOnchange(PassRefPtr<EventListener>);
    EventListener* onclick() const;
    void setOnclick(PassRefPtr<EventListener>);
    EventListener* oncontextmenu() const;
    void setOncontextmenu(PassRefPtr<EventListener>);
    EventListener* ondblclick() const;
    void setOndblclick(PassRefPtr<EventListener>);
    EventListener* onerror() const;
    void setOnerror(PassRefPtr<EventListener>);
    EventListener* onfocus() const;
    void setOnfocus(PassRefPtr<EventListener>);
    EventListener* oninput() const;
    void setOninput(PassRefPtr<EventListener>);
    EventListener* onkeydown() const;
    void setOnkeydown(PassRefPtr<EventListener>);
    EventListener* onkeypress() const;
    void setOnkeypress(PassRefPtr<EventListener>);
    EventListener* onkeyup() const;
    void setOnkeyup(PassRefPtr<EventListener>);
    EventListener* onload() const;
    void setOnload(PassRefPtr<EventListener>);
    EventListener* onmousedown() const;
    void setOnmousedown(PassRefPtr<EventListener>);
    EventListener* onmousemove() const;
    void setOnmousemove(PassRefPtr<EventListener>);
    EventListener* onmouseout() const;
    void setOnmouseout(PassRefPtr<EventListener>);
    EventListener* onmouseover() const;
    void setOnmouseover(PassRefPtr<EventListener>);
    EventListener* onmouseup() const;
    void setOnmouseup(PassRefPtr<EventListener>);
    EventListener* onmousewheel() const;
    void setOnmousewheel(PassRefPtr<EventListener>);
    EventListener* onbeforecut() const;
    void setOnbeforecut(PassRefPtr<EventListener>);
    EventListener* oncut() const;
    void setOncut(PassRefPtr<EventListener>);
    EventListener* onbeforecopy() const;
    void setOnbeforecopy(PassRefPtr<EventListener>);
    EventListener* oncopy() const;
    void setOncopy(PassRefPtr<EventListener>);
    EventListener* onbeforepaste() const;
    void setOnbeforepaste(PassRefPtr<EventListener>);
    EventListener* onpaste() const;
    void setOnpaste(PassRefPtr<EventListener>);
    EventListener* ondragenter() const;
    void setOndragenter(PassRefPtr<EventListener>);
    EventListener* ondragover() const;
    void setOndragover(PassRefPtr<EventListener>);
    EventListener* ondragleave() const;
    void setOndragleave(PassRefPtr<EventListener>);
    EventListener* ondrop() const;
    void setOndrop(PassRefPtr<EventListener>);
    EventListener* ondragstart() const;
    void setOndragstart(PassRefPtr<EventListener>);
    EventListener* ondrag() const;
    void setOndrag(PassRefPtr<EventListener>);
    EventListener* ondragend() const;
    void setOndragend(PassRefPtr<EventListener>);
    EventListener* onreset() const;
    void setOnreset(PassRefPtr<EventListener>);
    EventListener* onresize() const;
    void setOnresize(PassRefPtr<EventListener>);
    EventListener* onscroll() const;
    void setOnscroll(PassRefPtr<EventListener>);
    EventListener* onsearch() const;
    void setOnsearch(PassRefPtr<EventListener>);
    EventListener* onselect() const;
    void setOnselect(PassRefPtr<EventListener>);
    EventListener* onselectstart() const;
    void setOnselectstart(PassRefPtr<EventListener>);
    EventListener* onsubmit() const;
    void setOnsubmit(PassRefPtr<EventListener>);
    EventListener* onunload() const;
    void setOnunload(PassRefPtr<EventListener>);

    using TreeShared<Node>::ref;
    using TreeShared<Node>::deref;
 
private:
    virtual void refEventTarget() { ref(); }
    virtual void derefEventTarget() { deref(); }

    void removeAllEventListenersSlowCase();

private:
    virtual NodeRareData* createRareData();
    Node* containerChildNode(unsigned index) const;
    unsigned containerChildNodeCount() const;
    Node* containerFirstChild() const;
    Node* containerLastChild() const;
    bool rareDataFocused() const;

    virtual RenderStyle* nonRendererRenderStyle() const;

    virtual const AtomicString& virtualPrefix() const;
    virtual const AtomicString& virtualLocalName() const;
    virtual const AtomicString& virtualNamespaceURI() const;

    Element* ancestorElement() const;

    void appendTextContent(bool convertBRsToNewlines, StringBuilder&) const;

    DocPtr<Document> m_document;
    Node* m_previous;
    Node* m_next;
    RenderObject* m_renderer;

    unsigned m_styleChange : 2;
    bool m_hasId : 1;
    bool m_hasClass : 1;
    bool m_attached : 1;
    bool m_hasChangedChild : 1;
    bool m_inDocument : 1;
    bool m_isLink : 1;
    bool m_active : 1;
    bool m_hovered : 1;
    bool m_inActiveChain : 1;
    bool m_inDetach : 1;
    bool m_inSubtreeMark : 1;
    bool m_hasRareData : 1;
    const bool m_isElement : 1;
    const bool m_isContainer : 1;
    const bool m_isText : 1;

protected:
    // These bits are used by the Element derived class, pulled up here so they can
    // be stored in the same memory word as the Node bits above.
    bool m_parsingChildrenFinished : 1;
#if ENABLE(SVG)
    mutable bool m_areSVGAttributesValid : 1;
#endif

    // These bits are used by the StyledElement derived class, and live here for the
    // same reason as above.
    mutable bool m_isStyleAttributeValid : 1;
    mutable bool m_synchronizingStyleAttribute : 1;

#if ENABLE(SVG)
    // This bit is used by the SVGElement derived class, and lives here for the same
    // reason as above.
    mutable bool m_synchronizingSVGAttributes : 1;
#endif

    // 11 bits remaining
};

// Used in Node::addSubresourceAttributeURLs() and in addSubresourceStyleURLs()
inline void addSubresourceURL(ListHashSet<KURL>& urls, const KURL& url)
{
    if (!url.isNull())
        urls.add(url);
}

} //namespace

#ifndef NDEBUG
// Outside the WebCore namespace for ease of invocation from gdb.
void showTree(const WebCore::Node*);
#endif

#endif