Expanding or Collapsing All Nodes in a JTree Component - Java Swing

Java examples for Swing:JTree

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Description

Expanding or Collapsing All Nodes in a JTree Component

Demo Code

import java.util.Enumeration;

import javax.swing.JTree;
import javax.swing.tree.TreeNode;
import javax.swing.tree.TreePath;

public class Main {
  public void expandAll(JTree tree, boolean expand) {
    TreeNode root = (TreeNode) tree.getModel().getRoot();

    expandAll(tree, new TreePath(root), expand);
  }/*from w w w.  j  a  v  a  2 s . c  o m*/

  private void expandAll(JTree tree, TreePath parent, boolean expand) {
    TreeNode node = (TreeNode) parent.getLastPathComponent();
    if (node.getChildCount() >= 0) {
      for (Enumeration e = node.children(); e.hasMoreElements();) {
        TreeNode n = (TreeNode) e.nextElement();
        TreePath path = parent.pathByAddingChild(n);
        expandAll(tree, path, expand);
      }
    }

    // Expansion or collapse must be done bottom-up
    if (expand) {
      tree.expandPath(parent);
    } else {
      tree.collapsePath(parent);
    }
  }
}

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