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## charvax.swing.tree
Class DefaultTreeModel

    java.lang.Object
      charvax.swing.tree.DefaultTreeModel

All Implemented Interfaces:
  TreeModel

public class DefaultTreeModel
extends java.lang.Object
implements TreeModel

(UNDER CONSTRUCTION) A simple tree data model that uses TreeNodes.

Field Summary
`protected boolean` | `_asksAllowsChildren` Determines how the isLeaf method figures out if a node is a leaf node.
`protected java.util.ArrayList` | `_listeners`
`protected TreeNode` | `_root`

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.

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Field Detail

### _asksAllowsChildren

    protected boolean _asksAllowsChildren

  Determines how the isLeaf method figures out if a node is a leaf node. If true, a node is a leaf node if it does not allow children. (If it allows children, it is not a leaf node, even if no children are present.) That lets you distinguish between folder nodes and file nodes in a file system, for example.

  If this value is false, then any node which has no children is a leaf node, and any node may acquire children.

### _listeners

    protected java.util.ArrayList _listeners

### _root

    protected TreeNode _root

Method Detail

### getRoot

    public java.lang.Object getRoot()

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

  Specified by:
    `getRoot` in interface `TreeModel`

### 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)).

  Specified by:
    `getChild` in interface `TreeModel`

### 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.

  Specified by:
    `getChildCount` in interface `TreeModel`

### isLeaf

    public boolean isLeaf(java.lang.Object node_)

  Returns true if node is a leaf. The way the test is performed depends on the asksAllowsChildren setting.

  Specified by:
    `isLeaf` in interface `TreeModel`

### 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.

  Specified by:
    `valueForPathChanged` in interface `TreeModel`

### addTreeModelListener

    public void addTreeModelListener(TreeModelListener l)

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

  Specified by:
    `addTreeModelListener` in interface `TreeModel`

### removeTreeModelListener

    public void removeTreeModelListener(TreeModelListener l)

  Removes a listener previously added with addTreeModelListener.

  Specified by:
    `removeTreeModelListener` in interface `TreeModel`

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