Can't get Checkbox selection status in Tree

Question

Hi,
I'm using a Checkbox Tree which I got from here: [http://www.java2s.com/Code/Java/Swing-JFC/CheckBoxNodeTreeSample.htm|http://www.java2s.com/Code/Java/Swing-JFC/CheckBoxNodeTreeSample.htm]
Now, I want to determine whether the Checkboxes are selected or not.
Unfortunately, the custom CheckBox model class always returns true, which is stored in a Vector.
In short, this is how the checkTree is created:
CheckBoxNode tabFormatNode = new CheckBoxNode[]{new CheckBoxNode("GP3", true),
                                    new CheckBoxNode("GP4", true),
                                    new CheckBoxNode("GP5", true)};
NamedVector formatVector = new NamedVector("Format", tabFormatNode);
Object[] rootNodes = new Object[]{ formatVector }
Vector rootVector = new NamedVector("root", rootNodes);
TreeModel model = createTreeModel(rootVector);
setModel(model);As I said, when I retrieve a CheckBoxNode from the Vector, it always return true on isSelected(), so that's no use.
However, the renderer does manage to get the selection status correctly.
private static class CheckBoxNodeRenderer implements TreeCellRenderer
        private JCheckBox leafRenderer = new JCheckBox();
        protected JCheckBox getLeafRenderer()
            return leafRenderer;
        public CheckBoxNodeRenderer()
        public Component getTreeCellRendererComponent(JTree tree, Object value,
              boolean selected, boolean expanded, boolean leaf, int row,
              boolean hasFocus)
            Component returnValue;
            if (leaf)
                String stringValue = tree.convertValueToText(value, selected,
                    expanded, leaf, row, false);
                leafRenderer.setText(stringValue);
                leafRenderer.setSelected(false);
                if (selected)
                    leafRenderer.setForeground(selectionForeground);
                    leafRenderer.setBackground(selectionBackground);
                else
                    leafRenderer.setForeground(textForeground);
                    leafRenderer.setBackground(textBackground);
                if ((value != null) && (value instanceof DefaultMutableTreeNode))
                    Object userObject = ((DefaultMutableTreeNode) value)
                    .getUserObject();
                    if (userObject instanceof CheckBoxNode)
                        CheckBoxNode node = (CheckBoxNode) userObject;
                        leafRenderer.setText(node.getText());
                        leafRenderer.setSelected(node.isSelected());
                        // eigen
                        leafRenderer.setEnabled(Overview.getTabbedPane().getActiveTabList().isLeftPaneEnabled());
                returnValue = leafRenderer;
            else
              returnValue = nonLeafRenderer.getTreeCellRendererComponent(tree,
                  value, selected, expanded, leaf, row, hasFocus);
            return returnValue;
    }Could anyone help me with retrieving the correct selection values of the CheckBoxes?
Edited by: Tails on 21-mrt-2008 13:07

Answer 1

OK Tails. here are the changes you need, in CheckBoxNodeEditor method getTreeCellEditorComponent. Note that Component editor is now declared as final so that in can be accessed from within the inner class.   public Component getTreeCellEditorComponent (JTree tree, Object value,
         boolean selected, boolean expanded, boolean leaf, int row) {
      // change to final
      final Component editor = renderer.getTreeCellRendererComponent (tree, value,
            true, expanded, leaf, row, true);
      // editor always selected / focused
      // line added
      final CheckBoxNode cbn = (CheckBoxNode) ((DefaultMutableTreeNode) value).getUserObject ();
      ItemListener itemListener = new ItemListener () {
         public void itemStateChanged (ItemEvent itemEvent) {
            // line added
            cbn.setSelected (((CheckBoxNode) getCellEditorValue ()).isSelected ());
            if (stopCellEditing ()) {
               fireEditingStopped ();
      if (editor instanceof JCheckBox) {
         ((JCheckBox) editor).addItemListener (itemListener);
      return editor;
   }Get back to us on whether that solves the problem, willya.
db