void (MouseEvent e) { Point p = e.getPoint(); TreePath newPath = getPathForLocation(p.x, p.y); if (newPath != null && !newPath.equals(rollOverPath)) { TreeCellRenderer renderer = getCellRenderer(); if (newPath.getLastPathComponent() instanceof TreeNode node) { JComponent c = (JComponent)renderer.getTreeCellRendererComponent( Tree.this, node, isPathSelected(newPath), isExpanded(newPath), getModel().isLeaf(node), getRowForPath(newPath), hasFocus()); c.putClientProperty(UIUtil.CHECKBOX_ROLLOVER_PROPERTY, c instanceof JCheckBox ? getPathBounds(newPath) : node); rollOverPath = newPath; UIUtil.repaintViewport(Tree.this); } } }