khtml Library API Documentation

DOM::NodeFilter Class Reference

Filters are objects that know how to "filter out" nodes. More...

#include <dom2_traversal.h>

List of all members.

Public Types

enum  AcceptCode
 The following constants are returned by the acceptNode() method:. More...

enum  ShowCode
 These are the available values for the whatToShow parameter. More...


Public Methods

virtual short acceptNode (const Node &n)
 Test whether a specified node is visible in the logical view of a TreeWalker or NodeIterator.


Detailed Description

Filters are objects that know how to "filter out" nodes.

If an Iterator or TreeWalker is given a filter, before it returns the next node, it applies the filter. If the filter says to accept the node, the Iterator returns it; otherwise, the Iterator looks for the next node and pretends that the node that was rejected was not there.

The DOM does not provide any filters. Filter is just an interface that users can implement to provide their own filters.

Filters do not need to know how to iterate, nor do they need to know anything about the data structure that is being iterated. This makes it very easy to write filters, since the only thing they have to know how to do is evaluate a single node. One filter may be used with a number of different kinds of Iterators, encouraging code reuse.

To create your own cutsom NodeFilter, define a subclass of CustomNodeFilter which overrides the acceptNode() method and assign an instance of it to the NodeFilter. For more details see the CustomNodeFilter class

Definition at line 184 of file dom2_traversal.h.


Member Enumeration Documentation

enum DOM::NodeFilter::AcceptCode
 

The following constants are returned by the acceptNode() method:.

Definition at line 203 of file dom2_traversal.h.

enum DOM::NodeFilter::ShowCode
 

These are the available values for the whatToShow parameter.

They are the same as the set of possible types for Node, and their values are derived by using a bit position corresponding to the value of NodeType for the equivalent node type.

Definition at line 216 of file dom2_traversal.h.


Member Function Documentation

short NodeFilter::acceptNode const Node   n [virtual]
 

Test whether a specified node is visible in the logical view of a TreeWalker or NodeIterator.

This function will be called by the implementation of TreeWalker and NodeIterator; it is not intended to be called directly from user code.

Parameters:
n  The node to check to see if it passes the filter or not.
Returns:
a constant to determine whether the node is accepted, rejected, or skipped, as defined above .

Definition at line 166 of file dom2_traversal.cpp.


The documentation for this class was generated from the following files:
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This file is part of the documentation for kdelibs Version 3.1.0.
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Generated on Wed Oct 8 12:22:45 2003 by doxygen 1.2.18 written by Dimitri van Heesch, © 1997-2001