dom_nodeimpl.h

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    virtual long maxOffset() const;
    virtual long caretMinOffset() const;
    virtual long caretMaxOffset() const;
    virtual unsigned long caretMaxRenderedOffset() const;

    virtual long previousOffset (long current) const;
    virtual long nextOffset (long current) const;
    
#ifndef NDEBUG
    virtual void dump(QTextStream *stream, QString ind = "") const;
#endif

    // -----------------------------------------------------------------------------
    // 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 KHTMLView.
     */
    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();

    void createRendererIfNeeded();
    virtual khtml::RenderStyle *styleForRenderer(khtml::RenderObject *parent);
    virtual bool rendererIsNeeded(khtml::RenderStyle *);
    virtual khtml::RenderObject *createRenderer(RenderArena *, khtml::RenderStyle *);

    // -----------------------------------------------------------------------------
    // Methods for maintaining the state of the element between history navigation

    /**
     * Indicates whether or not this type of node maintains it's state. If so, the state of the node will be stored when
     * the user goes to a different page using the state() method, and restored using the restoreState() method if the
     * user returns (e.g. using the back button). This is used to ensure that user-changeable elements such as form
     * controls maintain their contents when the user returns to a previous page in the history.
     */
    virtual bool maintainsState();

    /**
     * Returns the state of this node represented as a string. This string will be passed to restoreState() if the user
     * returns to the page.
     *
     * @return State information about the node represented as a string
     */
    virtual QString state();

    /**
     * Sets the state of the element based on strings previously returned by state(). This is used to initialize form
     * controls with their old values when the user returns to the page in their history.  The receiver
     * should remove the string from the list that it uses for its restore.
     *
     * @param states The strings previously returned by nodes' state methods.
     */
    virtual void restoreState(QStringList &stateList);

    // -----------------------------------------------------------------------------
    // Notification of document stucture 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();

    /**
     * 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();

    virtual DOMString toString() const = 0;
    
#ifndef NDEBUG
    virtual void formatForDebugger(char *buffer, unsigned length) const;

    void displayNode(const char *prefix="");
    void displayTree();
#endif

    void registerNodeList(NodeListImpl *list);
    void unregisterNodeList(NodeListImpl *list);
    void notifyNodeListsSubtreeModified();
    void notifyLocalNodeListsSubtreeModified();

private: // members
    DocumentPtr *document;
    NodeImpl *m_previous;
    NodeImpl *m_next;
protected:
    khtml::RenderObject *m_render;
    QPtrList<RegisteredEventListener> *m_regdListeners;
    QPtrDict<NodeListImpl> *m_nodeLists;

    unsigned short m_tabIndex : 15;
    bool m_hasTabIndex  : 1;

    bool m_hasId : 1;
    bool m_hasClass : 1;
    bool m_hasStyle : 1;
    bool m_attached : 1;
    bool m_changed : 1;
    bool m_hasChangedChild : 1;
    bool m_inDocument : 1;

    bool m_hasAnchor : 1;
    bool m_specified : 1; // used in AttrImpl. Accessor functions there
    bool m_focused : 1;
    bool m_active : 1;
    bool m_styleElement : 1; // contains stylesheet text
    bool m_implicit : 1; // implicitely generated by the parser

    // 3 bits unused
};

// this is the full Node Implementation with parents and children.
class NodeBaseImpl : public NodeImpl
{
public:
    NodeBaseImpl(DocumentPtr *doc);
    virtual ~NodeBaseImpl();

    // DOM methods overridden from  parent classes
    virtual NodeImpl *firstChild() const;
    virtual NodeImpl *lastChild() const;
    virtual NodeImpl *insertBefore ( NodeImpl *newChild, NodeImpl *refChild, int &exceptioncode );
    virtual NodeImpl *replaceChild ( NodeImpl *newChild, NodeImpl *oldChild, int &exceptioncode );
    virtual NodeImpl *removeChild ( NodeImpl *oldChild, int &exceptioncode );
    virtual NodeImpl *appendChild ( NodeImpl *newChild, int &exceptioncode );
    virtual bool hasChildNodes (  ) const;

    // Other methods (not part of DOM)
    void removeChildren();
    void cloneChildNodes(NodeImpl *clone);

    virtual void setFirstChild(NodeImpl *child);
    virtual void setLastChild(NodeImpl *child);
    virtual NodeImpl *addChild(NodeImpl *newChild);
    virtual void attach();
    virtual void detach();

    virtual NodeListImpl *getElementsByTagNameNS ( DOMStringImpl* namespaceURI,
                                                   DOMStringImpl* localName );

    virtual QRect getRect() const;
    bool getUpperLeftCorner(int &xPos, int &yPos) const;
    bool getLowerRightCorner(int &xPos, int &yPos) const;

    virtual void setFocus(bool=true);
    virtual void setActive(bool=true);
    virtual unsigned long childNodeCount() const;
    virtual NodeImpl *childNode(unsigned long index);

    virtual void insertedIntoDocument();
    virtual void removedFromDocument();
    
    // check for being (grand-..)father:
    bool checkNoOwner( NodeImpl *other, int &exceptioncode );

//protected:
    NodeImpl *_first;
    NodeImpl *_last;

    // helper functions for inserting children:

    // ### this should vanish. do it in dom/ !
    // check for same source document:
    bool checkSameDocument( NodeImpl *newchild, int &exceptioncode );
    // check for being child:
    bool checkIsChild( NodeImpl *oldchild, int &exceptioncode );
    // ###

    // find out if a node is allowed to be our child
    void dispatchChildInsertedEvents( NodeImpl *child, int &exceptioncode );
    void dispatchChildRemovalEvents( NodeImpl *child, int &exceptioncode );
};

// --------------------------------------------------------------------------
class Node;
class NodeImpl;

class NodeListImpl : public khtml::Shared<NodeListImpl>
{
public:
    NodeListImpl( NodeImpl *_rootNode );
    virtual ~NodeListImpl();

    // DOM methods & attributes for NodeList
    virtual unsigned long length() const = 0;
    virtual NodeImpl *item ( unsigned long index ) const = 0;
    virtual NodeImpl *itemById ( const DOMString & elementId ) const;

    // Other methods (not part of DOM)

    void rootNodeSubtreeModified();

#if APPLE_CHANGES
    static NodeList createInstance(NodeListImpl *impl);
#endif
protected:
    // helper functions for searching all ElementImpls in a tree
    unsigned long recursiveLength(NodeImpl *start = 0) const;
    NodeImpl *recursiveItem ( unsigned long offset, NodeImpl *start = 0 ) const;
    virtual bool nodeMatches( NodeImpl *testNode ) const = 0;

    NodeImpl *rootNode;
    mutable int cachedLength;
    mutable NodeImpl *lastItem;
    mutable unsigned long lastItemOffset;
    mutable bool isLengthCacheValid : 1;
    mutable bool isItemCacheValid : 1;
};

class ChildNodeListImpl : public NodeListImpl
{
public:
    ChildNodeListImpl( NodeImpl *n);

    // DOM methods overridden from  parent classes

    virtual unsigned long length() const;
    virtual NodeImpl *item ( unsigned long index ) const;

protected:
    virtual bool nodeMatches( NodeImpl *testNode ) const;
};


/**
 * NodeList which lists all Nodes in a document with a given tag name
 */
class TagNodeListImpl : public NodeListImpl
{
public:
    TagNodeListImpl( NodeImpl *n, NodeImpl::Id tagId, NodeImpl::Id tagIdMask );

    // DOM methods overridden from  parent classes

    virtual unsigned long length() const;
    virtual NodeImpl *item ( unsigned long index ) const;

    // Other methods (not part of DOM)

protected:
    virtual bool nodeMatches( NodeImpl *testNode ) const;

    NodeImpl::Id m_id;
    NodeImpl::Id m_idMask;
};


/**
 * NodeList which lists all Nodes in a Element with a given "name=" tag
 */
class NameNodeListImpl : public NodeListImpl
{
public:
    NameNodeListImpl( NodeImpl *doc, const DOMString &t );

    // DOM methods overridden from  parent classes

    virtual unsigned long length() const;
    virtual NodeImpl *item ( unsigned long index ) const;

    // Other methods (not part of DOM)

protected:
    virtual bool nodeMatches( NodeImpl *testNode ) const;

    DOMString nodeName;
};


// Generic NamedNodeMap interface
// Other classes implement this for more specific situations e.g. attributes
// of an element
class NamedNodeMapImpl : public khtml::Shared<NamedNodeMapImpl>
{
public:
    NamedNodeMapImpl();
    virtual ~NamedNodeMapImpl();

    // DOM methods & attributes for NamedNodeMap
    virtual NodeImpl *getNamedItem ( NodeImpl::Id id ) const = 0;
    virtual Node removeNamedItem ( NodeImpl::Id id, int &exceptioncode ) = 0;
    virtual Node setNamedItem ( NodeImpl* arg, int &exceptioncode ) = 0;

    virtual NodeImpl *item ( unsigned long index ) const = 0;
    virtual unsigned long length(  ) const = 0;

    // Other methods (not part of DOM)
    virtual NodeImpl::Id mapId(const DOMString& namespaceURI,  const DOMString& localName,  bool readonly) = 0;
    virtual bool isReadOnly() { return false; }

#if APPLE_CHANGES
    static NamedNodeMap createInstance(NamedNodeMapImpl *impl);
#endif
};


// ### fixme
#if 0
// Generic read-only NamedNodeMap implementation
// You can add items using the internal function addItem()
class GenericRONamedNodeMapImpl : public NamedNodeMapImpl
{
public:
    GenericRONamedNodeMapImpl(DocumentPtr* doc);
    virtual ~GenericRONamedNodeMapImpl();

    // DOM methods & attributes for NamedNodeMap

    virtual NodeImpl *getNamedItem ( const DOMString &name, int &exceptioncode ) const;
    virtual Node setNamedItem ( const Node &arg, int &exceptioncode );
    virtual Node removeNamedItem ( const DOMString &name, int &exceptioncode );
    virtual NodeImpl *item ( unsigned long index ) const;
    virtual unsigned long length(  ) const;
    virtual NodeImpl *getNamedItemNS( const DOMString &namespaceURI, const DOMString &localName,
                                      int &exceptioncode ) const;
    virtual NodeImpl *setNamedItemNS( NodeImpl *arg, int &exceptioncode );
    virtual NodeImpl *removeNamedItemNS( const DOMString &namespaceURI, const DOMString &localName,
                                         int &exceptioncode );

    // Other methods (not part of DOM)

    virtual bool isReadOnly() { return true; }

    void addNode(NodeImpl *n);

protected:
    DocumentImpl* m_doc;
    QPtrList<NodeImpl> *m_contents;
};
#endif

}; //namespace
#endif