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How to edit nodes in JTree?

Lewis
Lewis asked
on
Medium Priority
820 Views
Last Modified: 2012-05-04
I need to change the text of the nodes
of a JTree.

How to do this and how to get notified?

Lewis
Comment
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Commented:
JTree class has getModel() method which returns a tree model class implementing TreeModel interface (by default it returns DefaultTreeModel class object).

In the DefaultTreeModel class there are methods addTreeModelListener() and nodeChanged(). The first one allows you to register listeners interested in tree node changes (the listeners implement treeNodesChanged() method). The second is called when you change a node (I assume it is responsible for notifying the listeners).

There is no standard way of changing tree node text since tree node is a wrapper around user's data (the wrapper, MutableTreeNode, calls getString() method of your data object do decide on the label to display in the tree view if you are using the default cell renderer). You simply change you data object and call nodeChanged() method on a tree model passing the changed node.

Hope that helps.

Michael

Author

Commented:
Hi Michael,
so you are saxing there is no way to edit
a node like in the Windows Explorer, where
you simply click on the node, it gets high-
lighted and editable?

Lewis
Commented:
There is a default mechanism in JFC tree implementation which allows to edit a tree node like you do in Explorer (I thought you are talking about generic changes to a node text to which there is no concrete answer).  If you look at the SampleTree example supplied with JFC you will see a tree with editable nodes. The comoponent responsible for editing the node implements TreeCellEditor and is called BasicTreeCellEditor.  There is a method in the JTree class setEditable(boolean). The default cell editor alternates between label and text field to display a tree node before and during editing. (Click-pause-click takes the node in the editinig mode). I assume the cell editor takes care of notifying the tree of  the name change.

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Author

Commented:
Sorry for answering so late. I forgot that the question was
still locked. Thanks, I found the Swing example, it helped.
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