All Known Implementing Classes:

DefaultTreeModel

public interface TreeModel

See Also:

TreePath

• Method Summary

  All Methods

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

• Method Detail

  • getRoot

    Object getRoot()

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

    Returns:

    the root of the tree

  • getChild

    Object getChild(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)).

    Parameters:

    parent - a node in the tree, obtained from this data source

    Returns:

    the child of parent at index index

  • getChildCount

    int getChildCount(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.

    Parameters:

    parent - a node in the tree, obtained from this data source

    Returns:

    the number of children of the node parent

  • isLeaf

    boolean isLeaf(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.

    Parameters:

    node - a node in the tree, obtained from this data source

    Returns:

    true if node is a leaf

  • valueForPathChanged

    void valueForPathChanged(TreePath path,
     Object newValue)

    Messaged 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.

    Parameters:

    path - path to the node that the user has altered

    newValue - the new value from the TreeCellEditor

  • getIndexOfChild

    int getIndexOfChild(Object parent,
     Object child)

    Returns the index of child in parent. If either parent or child is null, returns -1. If either parent or child don't belong to this tree model, returns -1.

    Parameters:

    parent - a node in the tree, obtained from this data source

    child - the node we are interested in

    Returns:

    the index of the child in the parent, or -1 if either child or parent are null or don't belong to this tree model

  • addTreeModelListener

    void addTreeModelListener(TreeModelListener l)

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

    Parameters:

    l - the listener to add

    See Also:

    removeTreeModelListener(javax.swing.event.TreeModelListener)

  • removeTreeModelListener

    void removeTreeModelListener(TreeModelListener l)

    Removes a listener previously added with addTreeModelListener.

    Parameters:

    l - the listener to remove

    See Also:

    addTreeModelListener(javax.swing.event.TreeModelListener)