How to display multiple JComponents in a tree cell renderer

Question

I have an object in a tree cell renderer and want to display its members(three members) status in a JTree as checkboxes such that each node displays three checkboxex with member-names and a node name. i tried using a JPanel and adding three labels into this panel to be returned for the cell renderer but the GUI fails to paint the node componnents. However on clicking the node the component which isn't visible displays correctly. please Help me out

Answer 1

Since you didn't provide any sample code, it's all about wild guesses on what your problem is. The following code shows the type of program you could have posted :import javax.swing.*;
import javax.swing.tree.*;
import java.awt.*;
public class TestTree extends JPanel {
     private static class MyCell {
          String theCellName;
          boolean theFirstField;
          boolean theSecondField;
          boolean theThirdField;
          public MyCell(String aName, boolean firstField, boolean secondField, boolean thirdField) {
               theCellName = aName;
               theFirstField = firstField;
               theSecondField = secondField;
               theThirdField = thirdField;
     private static class MyTreeCellRenderer extends JPanel implements TreeCellRenderer {
          private JLabel theCellNameLabel;
          private JCheckBox theFirstCheckBox;
          private JCheckBox theSecondCheckBox;
          private JCheckBox theThirdCheckBox;
          private DefaultTreeCellRenderer theDelegate;
          public MyTreeCellRenderer() {
               super(new GridLayout(4, 1));
               theCellNameLabel = new JLabel();
               add(theCellNameLabel);
               theFirstCheckBox = new JCheckBox("firstField");
               add(theFirstCheckBox);
               theSecondCheckBox = new JCheckBox("secondField");
               add(theSecondCheckBox);
               theThirdCheckBox = new JCheckBox("thirdField");
               add(theThirdCheckBox);
               theDelegate = new DefaultTreeCellRenderer();
               setOpaque(true);
          public Component getTreeCellRendererComponent(JTree tree, Object value, boolean selected,
                                                                   boolean expanded, boolean leaf, int row, boolean hasFocus) {
               if (!(value instanceof DefaultMutableTreeNode)) {
                    return theDelegate.getTreeCellRendererComponent(tree, value, selected, expanded, leaf, row, hasFocus);
               Object userObject = ((DefaultMutableTreeNode)value).getUserObject();
               if (!(userObject instanceof MyCell)) {
                    return theDelegate.getTreeCellRendererComponent(tree, value, selected, expanded, leaf, row, hasFocus);
               setBackground(tree.getBackground());
               if (selected) {
                    setBorder(BorderFactory.createLineBorder(Color.BLUE, 2));
               } else {
                    setBorder(BorderFactory.createLineBorder(getBackground(), 2));
               MyCell cell = (MyCell)userObject;
               theCellNameLabel.setText(cell.theCellName);
               theFirstCheckBox.setSelected(cell.theFirstField);
               theSecondCheckBox.setSelected(cell.theSecondField);
               theThirdCheckBox.setSelected(cell.theThirdField);
               return this;
          public Component add(Component comp) {
               if (comp instanceof JComponent) {
                    ((JComponent)comp).setOpaque(false);
               return super.add(comp);
     public TestTree() {
          super(new BorderLayout());
          JTree tree = new JTree(createModel());
          tree.setShowsRootHandles(true);
          tree.setCellRenderer(new MyTreeCellRenderer());
          add(new JScrollPane(tree), BorderLayout.CENTER);
     private static final TreeModel createModel() {
          DefaultMutableTreeNode root = new DefaultMutableTreeNode(new MyCell("root", true, true, true));
          DefaultMutableTreeNode child1 = new DefaultMutableTreeNode(new MyCell("child1", false, true, false));
          DefaultMutableTreeNode child2 = new DefaultMutableTreeNode(new MyCell("child2", false, false, true));
          root.add(child1);
          root.add(child2);
          return new DefaultTreeModel(root);
     public static void main(String[] args) {
          final JFrame frame = new JFrame("Test");
          frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
          frame.setContentPane(new TestTree());
          SwingUtilities.invokeLater(new Runnable() {
               public void run() {
                    frame.setSize(600, 400);
                    frame.show();
}