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POJDialog - Refresh dynamically added nodes in JTree
 

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  1. POJDialog - Refresh dynamically added nodes in JTree
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    <p>I have a problem with JTree nodes visibility I use for my JDialog. When I want to add new node to the model the Jtree is not refreshed.</p> <p>Strange is the nodes are updating just as they should if I set setRootVisible(true).</p> <p>Here is the code. Thanks in advance</p> <pre><code>import java.awt.BorderLayout; import java.awt.Dimension; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import javax.swing.JButton; import javax.swing.JComponent; import javax.swing.JDialog; import javax.swing.JFrame; import javax.swing.JOptionPane; import javax.swing.JPanel; import javax.swing.JTree; import javax.swing.tree.DefaultMutableTreeNode; import javax.swing.tree.DefaultTreeModel; public class TestClass { JTree tree; DefaultTreeModel dm; JDialog dialog; public TestClass(){ JFrame frame = new JFrame("title"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setVisible(true); JPanel showPane = new JPanel(); showPane.setLayout(new BorderLayout()); dm = new DefaultTreeModel(new DefaultMutableTreeNode("root")); tree = new JTree(dm); tree.setRootVisible(false); JButton button = new JButton("add node"); button.addActionListener(new ActionListener(){ public void actionPerformed(ActionEvent arg0) { DefaultMutableTreeNode root = (DefaultMutableTreeNode) tree.getModel().getRoot(); dm.insertNodeInto(new DefaultMutableTreeNode("Node " + (root.getChildCount() + 1)), root, root.getChildCount()); int c = root.getChildCount(); System.out.println("child count: " + c); for(int i=0; i&lt;c; i++){ DefaultMutableTreeNode node = (DefaultMutableTreeNode) root.getChildAt(i); System.out.println("has node:" + node.getUserObject().toString()); } } }); showPane.add(tree, BorderLayout.CENTER); showPane.add(button, BorderLayout.PAGE_END); JComponent[] inputComponents = new JComponent[] {showPane}; Object[] opButtons = {"OK"}; JOptionPane optPane = new JOptionPane(inputComponents , JOptionPane.PLAIN_MESSAGE , JOptionPane.CLOSED_OPTION , null , opButtons , opButtons[0]); optPane.setPreferredSize(new Dimension(400 ,250)); dialog = optPane.createDialog(null, "Create new Application Node"); dialog.setLocationRelativeTo(frame); dialog.setVisible(true); if(optPane.getValue() != null){ System.exit(0); } } public static void main(String arg[]){ TestClass myClass = new TestClass(); } </code></pre> <p>}</p>
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    1. USbioMind
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    1. COThere are two factors combining to hide the added nodes. 1) The root not is not visible. 2) The nodes are not expanded after the model is updated.
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      1. USAndrew Thompson
 

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