Tooltip over a TreeNode in JTree

Question

We are trying to get the tooltip for a TreeNode to show up directly over the text of the node so that when the TreeNode text is clipped by a JSplitPane divider it can be seen completly as a tooltip. Our interface is very similar to Explorer where there is a file system tree on the left and a table on the right. We want the tooltip to show up just like it does in Explorer. We have tried numerous different techniques, but am unable to get the tooltip to show up directly over the node and to the right of the TreeNode's icon.
Any help you can give would be greatly appreciated... and I'll throw in some duke dollars too. What the heck, I've got so many, I don't know what to do with them. ;-)
Thanks,
Troy

Answer 1

Override the getToolTipLocation(MouseEvent e) method in your JTree to display the tooltip in the desired location(directly over the tree node).
Try this piece of code. I've used it in my application and it works!
public Point getToolTipLocation(MouseEvent event)
Point location = null;
     Point point = event.getPoint();
     TreePath path = getPathForLocation(point.x, point.y);
     if (path != null && isTextVisible(path) == false)
          TreeCellRenderer renderer = getCellRenderer();
          java.awt.Component c =
               renderer.getTreeCellRendererComponent(
               this,path.getLastPathComponent(),false,
               false,false,0,false);
          if (c instanceof JLabel)
               JLabel label = (JLabel)c;
               int icon = label.getIcon() == null
                    ? 0 : label.getIcon().getIconWidth();
               Rectangle cellBounds = getPathBounds(path);
               location = new Point(cellBounds.x icon label.getIconTextGap(), cellBounds.y);
          return location;
private boolean isTextVisible(TreePath path)
     Rectangle cellBounds = this.getPathBounds(path);
     Rectangle visibleRect = this.getVisibleRect();
     if ((visibleRect.width - cellBounds.x) < cellBounds.width)
          return false;
     return true;
}