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Creating a GUI With JFC/Swing
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Writing Event Listeners
How to Write a Tree Model Listener
By implementing a tree model listener,
you can detect when the data displayed by a
tree
changes.
You can use a tree model listener
to detect when the user edits tree nodes. All notifications describe changes relative to a node in the tree.
For details,
read
Dynamically Changing a Tree.
The TreeModelListener
Interface
TreeModelListener has no adapter class.
The TreeModelEvent API
| Method |
Purpose |
Object getSource()
(in java.util.EventObject)
|
Return the object that fired the event.
|
|
int[] getChildIndices() |
For treeNodesChanged,
treeNodesInserted, and
treeNodesRemoved,
returns the indices of the changed, inserted, or deleted nodes,
respectively.
Returns nothing useful for treeStructureChanged.
|
|
Object[] getChildren() |
Returns the objects corresponding to the child indices.
|
|
Object[] getPath() |
Returns the path to the parent of the changed, inserted,
or deleted nodes.
For treeStructureChanged,
returns the path to the node beneath which
the structure has changed.
|
|
TreePath getTreePath() |
Returns the same thing as getPath,
but as a
TreePath object.
|
Examples that Use Tree Model Listeners
The following table lists the
examples that use tree expansion listeners.
| Example
|
Where Described
|
Notes
|
DynamicTreeDemo
|
How to Use Trees |
The DynamicTree
class implements a tree model listener to detect
when the user has edited a node's data.
|
