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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. |
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. |
