Java JTree Expand expandLevels(JTree tree, int levels, boolean expand)

Description

expand Levels

License

Apache License

Declaration

public static void expandLevels(JTree tree, int levels, boolean expand) 

Method Source Code

//package com.java2s;
/*/*  ww  w.ja  va2 s.c o  m*/
 * Copyright 2002-2004 the original author or authors.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */

import java.util.Enumeration;
import javax.swing.JTree;
import javax.swing.tree.TreeModel;
import javax.swing.tree.TreeNode;
import javax.swing.tree.TreePath;

public class Main {
    public static void expandLevels(JTree tree, int levels, boolean expand) {
        TreeModel model = tree.getModel();
        if (model == null) {
            return;
        }
        TreeNode root = (TreeNode) model.getRoot();
        // Traverse tree from root
        expandLevels(tree, new TreePath(root), levels, expand);
    }

    public static void expandLevels(JTree tree, TreePath parent, int levels, boolean expand) {
        // Traverse children
        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);
                if (levels > 0) {
                    expandLevels(tree, path, --levels, expand);
                }
            }
        }

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

Related

1. expandByExpansionStateStrings(final JTree tree, final TreePath parent, ArrayList expansionStateStrings)
2. expandFirstNode(JTree tree)
3. expandFirstNodeAtLevel(int level, JTree tree)
4. expandFully(JTree tree, TreePath path)
5. expandJTreeNode(javax.swing.JTree tree, javax.swing.tree.TreeModel model, Object node, int row, int depth)
6. expandNodesAtLevel(int level, JTree tree, TreePath parent)
7. expandOrCollapseAllRows(final JTree tree, final boolean expand)
8. expandOrCollapseJTree(JTree tree, boolean expand)
9. expandPath(JTree tree, TreePath tp)