Java Utililty Methods JTree Expand

List of utility methods to do JTree Expand

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Description

The list of methods to do JTree Expand are organized into topic(s).

Method

voidautoExpand(JTree tree, TreePath path, int maxLines, int maxChildToExpand, boolean dontExpandToLeafs)
Checks give TreePath for the last node, and if it ends with a node with just one child, it keeps expanding further. 
TreeModel model = tree.getModel();
Object node = path.getLastPathComponent();
TreePath newPath = path;
int currentLines = 0;
while (currentLines++ < maxLines && !model.isLeaf(node) && (model.getChildCount(node) > 0)
        && (model.getChildCount(node) <= maxChildToExpand)) {
    for (int i = 0; i < model.getChildCount(node); i++) {
        node = tree.getModel().getChild(node, i);
...
TreePathbuildTreePath(JTree tree, TreePath parent, String[] nodes, int startdepth, boolean expandable)
build Tree Path 
TreeNode node = (TreeNode) parent.getLastPathComponent();
String o = node.toString();
if (o.equals(nodes[startdepth])) {
    if (startdepth == nodes.length - 1) {
        return parent;
    if (node.getChildCount() >= 0) {
        for (Enumeration e = node.children(); e.hasMoreElements();) {
...
voidexpand(JTree tree, int depth)
expand 
for (int row = 0; row < tree.getRowCount(); row++) {
    if (tree.getPathForRow(row).getPathCount() < depth + 1) {
        tree.expandRow(row);
voidexpand(JTree tree, int level)
expand 
DefaultMutableTreeNode currentNode = (DefaultMutableTreeNode) tree.getModel().getRoot();
while (currentNode != null) {
    if (currentNode.getLevel() <= level) {
        tree.expandPath(new TreePath(currentNode.getPath()));
    currentNode = currentNode.getNextNode();
voidexpand(JTree tree, int startingIndex, int rowCount)
Stolen from http://stackoverflow.com/a/19935987/5620200 
for (int i = startingIndex; i < rowCount; ++i) {
    tree.expandRow(i);
if (tree.getRowCount() != rowCount) {
    expand(tree, rowCount, tree.getRowCount());
voidexpandAll(final JTree tree, final TreePath parent, final boolean expand)
expand All 
final TreeNode node = (TreeNode) parent.getLastPathComponent();
if (node.getChildCount() >= 0) {
    for (final Enumeration<?> e = node.children(); e.hasMoreElements();) {
        final TreeNode n = (TreeNode) e.nextElement();
        final TreePath path = parent.pathByAddingChild(n);
        expandAll(tree, path, expand);
if (expand) {
    tree.expandPath(parent);
} else {
    tree.collapsePath(parent);
voidexpandAll(JTree jTree)
expand All 
for (int i = 0; i < jTree.getRowCount(); i++) {
    jTree.expandRow(i);
voidexpandAll(JTree rightTree)
expand All 
expandAll(rightTree, new TreePath(((DefaultMutableTreeNode) rightTree.getModel().getRoot()).getPath()));
voidexpandAll(JTree t)
expand All 
expandAll(t, new TreePath(t.getModel().getRoot()));
voidexpandAll(JTree tree)
expand All 
tree.expandPath(new TreePath(tree.getModel().getRoot()));
int oldRowCount = 0;
do {
    int rowCount = tree.getRowCount();
    if (rowCount == oldRowCount)
        break;
    oldRowCount = rowCount;
    for (int i = 0; i < rowCount; i++) {
...