Swing/ExpandAllNodes のバックアップ(No.12)

//@see http://www.rgagnon.com/javadetails/java-0210.html
//Expand or collapse a JTree - Real's Java How-to
private void expandAll(JTree tree) {
  int row = 0;
  while (row < tree.getRowCount()) {
    tree.expandRow(row);
    row++;
  }
}
private void collapseAll(JTree tree) {
  int row = tree.getRowCount() - 1;
  while (row >= 0) {
    tree.collapseRow(row);
    row--;
  }
}

private void visitAll(JTree tree, TreePath parent, boolean expand) {
  TreeNode node = (TreeNode) parent.getLastPathComponent();
  if (!node.isLeaf() && node.getChildCount() >= 0) {
    Enumeration e = node.children();
    while (e.hasMoreElements()) {
      TreeNode n = (TreeNode) e.nextElement();
      TreePath path = parent.pathByAddingChild(n);
      visitAll(tree, path, expand);
    }
  }
  if (expand) {
    tree.expandPath(parent);
  } else {
    tree.collapsePath(parent);
  }
}