charvax.swing.tree
Interface TreeModel

All Known Implementing Classes:

DefaultTreeModel

public interface TreeModel

This interface defines a suitable data model for a JTree.

Method Summary

void	addTreeModelListener(TreeModelListener l) Adds a listener for the TreeModelEvent posted after the tree changes.
java.lang.Object	getChild(java.lang.Object parent, int index) Returns the child of parent at index index in the parent's child array.
int	getChildCount(java.lang.Object parent) Returns the number of children of parent.
java.lang.Object	getRoot() Returns the root of the tree.
boolean	isLeaf(java.lang.Object node) Returns true if node is a leaf.
void	removeTreeModelListener(TreeModelListener l) Removes a listener previously added with addTreeModelListener.
void	valueForPathChanged(TreePath path, java.lang.Object newValue) Called when the user has altered the value for the item identified by path to newValue.

Method Detail

getRoot

public java.lang.Object getRoot()

Returns the root of the tree. Returns null only if the tree has no nodes.

getChild

public java.lang.Object getChild(java.lang.Object parent,
                                 int index)

Returns the child of parent at index index in the parent's child array. parent must be a node previously obtained from this data source. This should not return null if index is a valid index for parent (that is index >= 0 && index < getChildCount(parent)).

getChildCount

public int getChildCount(java.lang.Object parent)

Returns the number of children of parent. Returns 0 if the node is a leaf or if it has no children. parent must be a node previously obtained from this data source.

isLeaf

public boolean isLeaf(java.lang.Object node)

Returns true if node is a leaf. It is possible for this method to return false even if node has no children. A directory in a filesystem, for example, may contain no files; the node representing the directory is not a leaf, but it also has no children.

valueForPathChanged

public void valueForPathChanged(TreePath path,
                                java.lang.Object newValue)

Called when the user has altered the value for the item identified by path to newValue. If newValue signifies a truly new value the model should post a treeNodesChanged event.

addTreeModelListener

public void addTreeModelListener(TreeModelListener l)

Adds a listener for the TreeModelEvent posted after the tree changes.

removeTreeModelListener

public void removeTreeModelListener(TreeModelListener l)

Removes a listener previously added with addTreeModelListener.