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POCreating Dynamic JTrees (Controlling Root Node Visibility)
 

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    <p>I have a question about how to dynamically generate JTrees. Is there a way to set the Root Node invisible without making its children invisible too? I have tried to do the following but it shows all nodes as invisible. Keep in mind that I want to add and remove children of the Root Node at any point in time. I've added comments so you can follow what I intend to do. Let me know if they are doing something I dont need, as I am new to JTrees and don't know the conventions. I would also like to be able to select multiple children for the listener.</p> <pre><code> DefaultMutableTreeNode rootNode; rootNode = new DefaultMutableTreeNode(); //I want this invisible. DefaultTreeModel treeModel = new DefaultTreeModel(rootNode); JTree tree = new JTree(treeModel); treeModel.addTreeModelListener(this); tree.setRootVisible(false); // Sets everything invisible tree.setEditable(true); //makes tree dynamic tree.setShowsRootHandles(true); //supposedly allows you to see the children of the nodes. tree.getSelectionModel().setSelectionMode(TreeSelectionModel.SINGLE_TREE_SELECTION); //I would like the line above to be multi-select; however, this doesn't seem to be an option. DefaultMutableTreeNode table = new DefaultMutableTreeNode( "table1"); rootNode.add(book); DefaultMutableTreeNode value = new DefaultMutableTreeNode( "value"); table.add(value); </code></pre> <p>In the above example. Nothing is shown and when I remove the "tree.setRootVisible(false)" everything is visible including the node.</p>
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    1. USJeffrey
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    1. COIf you make the root invisible, it's (visually) not there any more. So what are the child nodes going to hang off? The concept doesn't make sense to me.
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      1. USCarl Smotricz
    2. COI would like to have multiple "root nodes". The problem is that if no tables are loaded I don't want anything to be showing. And if a table is loaded I only want to see that table and its contents. If multiple tables are open I only want to see them. I don't want a "Root Table" with zero functionality to be constanty visible.
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