dom_nodeimpl.h

konqueror3 embedded版本, KDE环境下的当家浏览器的嵌入式版本源码包.

     * Notifies the node that no more children will be added.
     */
    virtual void close();

    void closeRenderer();

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

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

    /**
     * Indicates whether or not this type of node maintains its 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 a string previosuly returned by state(). This is used to initialize form
     * controls with their old values when the user returns to the page in their history.
     *
     * @param state A string representation of the node's previously-stored state
     */
    virtual void restoreState(const QString &state);

    // -----------------------------------------------------------------------------
    // 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 its 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;
    /**
     * Sometimes we need to get the string between two points on the DOM graph.  Use this function to do this.
     * For example, when the user copies some selected text to the clipboard as html.
     * @param selectionStart Where to start the selection.  If selectionStart != this, it is assumed we are after the start point
     * @param selectionEnd   Where to end the selection.  If selectionEnd != this, it is assumed we are before the end point (unless found is true)
     * @param startOffset    Number of characters into the text in selectionStart that the start of the selection is.
     * @param endOffset      Number of characters into the text in selectionEnd that the end of the selection is.
     * @param found          When this is set to true, don't print anymore but closing tags.
     * @return An html formatted string for this node and its children between the selectionStart and selectionEnd.
     */
    virtual DOMString selectionToString(NodeImpl * /*selectionStart*/, NodeImpl * /*selectionEnd*/, int /*startOffset*/, int /*endOffset*/, bool &/*found*/) const { return toString(); }

private: // members
    DocumentPtr *document;
    NodeImpl *m_previous;
    NodeImpl *m_next;
protected:
    khtml::RenderObject *m_render;
    RegisteredListenerList m_regdListeners;

    unsigned short m_tabIndex : 15;
    bool m_hasTabIndex  : 1;

    bool m_hasId : 1;
    bool m_hasStyle : 1;
    bool m_attached : 1;
    bool m_closed : 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
    bool m_rendererNeedsClose : 1;
    bool m_htmlCompat : 1; // true if element was created in HTML compat mode
    bool m_unused : 1;
};

// this is the full Node Implementation with parents and children.
class NodeBaseImpl : public NodeImpl
{
public:
    NodeBaseImpl(DocumentPtr *doc)
        : NodeImpl(doc), _first(0), _last(0) {}
    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();


    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();
    virtual NodeImpl *childNode(unsigned long index);

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:
    //Type of the item stored in the cache.
    enum Type {
        UNCACHEABLE, //Too complex to be cached like this
        CHILD_NODES,
        LAST_NODE_LIST = CHILD_NODES
    };

    struct CacheKey
    {
        NodeImpl* baseNode;
        int       type;

        CacheKey(): type(UNCACHEABLE) {}

        CacheKey(NodeImpl* _baseNode, int _type):
            baseNode(_baseNode), type(_type)
        {}

        int hash() const
        {
            return int(reinterpret_cast<unsigned long>(baseNode) >> 2) ^
                       (unsigned(type) << 26);
        }

        bool operator==(const CacheKey& other) const
        {
            return baseNode == other.baseNode &&
                   type     == other.type;
        }
    };

    struct Cache: public khtml::Shared<Cache>
    {
        static Cache* make() { return new Cache; }
    
        CacheKey key;//### We must store this in here due to QCache in Qt3 sucking

        unsigned int version;
        union
        {
            NodeImpl*    node;
            unsigned int index;
        } current;
        unsigned int position;
        unsigned int length;
        bool         hasLength;
        
        void updateNodeListInfo(DocumentImpl* doc);

        virtual void clear(DocumentImpl* doc);
        virtual ~Cache();
    };

    typedef Cache* CacheFactory();

    NodeListImpl(NodeImpl* node, int type, CacheFactory* factory = 0);
    virtual ~NodeListImpl();

    // DOM methods & attributes for NodeList
    virtual unsigned long length() const;
    virtual NodeImpl *item ( unsigned long index ) const;

    // Other methods (not part of DOM)

protected:
    // helper functions for searching all ElementImpls in a tree
    unsigned long recursiveLength(NodeImpl *start) const;
    NodeImpl *recursiveItem    ( NodeImpl* absStart, NodeImpl *start, unsigned long &offset ) const;
    NodeImpl *recursiveItemBack( NodeImpl* absStart, NodeImpl *start, unsigned long &offset ) const;

    // Override this to determine what nodes to return. Set doRecurse to 
    // false if the children of this node do not need to be entered.
    virtual bool nodeMatches( NodeImpl *testNode, bool& doRecurse ) const = 0;

    NodeImpl*      m_refNode;
    mutable Cache* m_cache;
};

class ChildNodeListImpl : public NodeListImpl
{
public:
 
    ChildNodeListImpl( NodeImpl *n);
    
protected:
    virtual bool nodeMatches( NodeImpl *testNode, bool& doRecurse ) const;
};


/**
 * NodeList which lists all Nodes in a document with a given tag name
 */
class TagNodeListImpl : public NodeListImpl
{
public:
    TagNodeListImpl( NodeImpl *n, NodeImpl::Id id );
    TagNodeListImpl( NodeImpl *n, const DOMString &namespaceURI, const DOMString &localName );

    // Other methods (not part of DOM)

protected:
    virtual bool nodeMatches( NodeImpl *testNode, bool& doRecurse ) const;
    NodeImpl::Id m_id;
    DOMString m_namespaceURI;
    DOMString m_localName;

    bool m_matchAllNames;
    bool m_matchAllNamespaces;
    bool m_namespaceAware;
};


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

    // Other methods (not part of DOM)

protected:
    virtual bool nodeMatches( NodeImpl *testNode, bool& doRecurse ) 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, bool nsAware = false, DOMStringImpl* qName = 0 ) const = 0;
    virtual Node removeNamedItem ( NodeImpl::Id id, bool nsAware, DOMStringImpl* qName, int &exceptioncode ) = 0;
    virtual Node setNamedItem ( NodeImpl* arg, bool nsAware, DOMStringImpl* qName, 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(DOMStringImpl* namespaceURI,
				DOMStringImpl* localName, bool readonly) = 0;
    virtual bool isReadOnly() { return false; }
};

// Generic read-only NamedNodeMap implementation
// Used for e.g. entities and notations in DocumentType.
// You can add nodes using addNode
class GenericRONamedNodeMapImpl : public NamedNodeMapImpl
{
public:
    GenericRONamedNodeMapImpl(DocumentPtr* doc);
    virtual ~GenericRONamedNodeMapImpl();

    // DOM methods & attributes for NamedNodeMap

    virtual NodeImpl *getNamedItem ( NodeImpl::Id id, bool nsAware = false, DOMStringImpl* qName = 0 ) const;
    virtual Node removeNamedItem ( NodeImpl::Id id, bool nsAware, DOMStringImpl* qName, int &exceptioncode );
    virtual Node setNamedItem ( NodeImpl* arg, bool nsAware, DOMStringImpl* qName, int &exceptioncode );

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

    // Other methods (not part of DOM)
    virtual NodeImpl::Id mapId(DOMStringImpl* namespaceURI,
                               DOMStringImpl* localName, bool readonly);

    virtual bool isReadOnly() { return true; }

    void addNode(NodeImpl *n);

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

} //namespace
#endif