int (JTree tree, int depth) { if (tree == null) return 0; final TreeUI ui = tree.getUI(); if (ui instanceof BasicTreeUI treeUI) { return (treeUI.getLeftChildIndent() + treeUI.getRightChildIndent()) * depth; } final int leftIndent = UIUtil.getTreeLeftChildIndent(); final int rightIndent = UIUtil.getTreeRightChildIndent(); return (leftIndent + rightIndent) * depth; }