Enabling tooltips on a JTree

Thinks i keep forgetting. Today: Enabling a JTree in J2SE to show different tooltips on his nodes:

1. Create a custom tree renderer like so:

import java.awt.Component;
 
import javax.swing.JTree;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.DefaultTreeCellRenderer;
 
public class TooltipTreeRenderer  extends DefaultTreeCellRenderer  {	
  @Override
  public Component getTreeCellRendererComponent(JTree tree, Object value, boolean sel, boolean expanded, boolean leaf, int row, boolean hasFocus) {
    final Component rc = super.getTreeCellRendererComponent(tree, value, sel, expanded, leaf, row, hasFocus);		
    String tooltip = "Compute some arbitrary text depending on the node (which is hidden behind 'value')";
    this.setToolTipText(tooltip);
    return rc;
  }
}

2. Set this renderer

aTree.setCellRenderer(new TooltipTreeRenderer());

3. Keep wondering, why the tooltip doesn’t show…

4. Register the tree with the ToolTipManager (which isn’t necessary for nearly all other Swing Components…)

javax.swing.ToolTipManager.ToolTipManager.sharedInstance().registerComponent(aTree);

5. Enjoy

info.michael-simons.eu

Enabling tooltips on a JTree

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