Java JTree Node initializeExpandedPathsBeforeChange(JTree tree, DefaultMutableTreeNode root)

Description

Call this before a JTree changes.

License

Open Source License

Parameter

Parameter	Description
tree	The jtree
root	Its tree root

Return

Holds the state for later expansion

Declaration

public static Hashtable initializeExpandedPathsBeforeChange(JTree tree, DefaultMutableTreeNode root) 

Method Source Code

//package com.java2s;
/*/*  ww  w.  j  a  v  a  2 s.co m*/
 * Copyright 1997-2016 Unidata Program Center/University Corporation for
 * Atmospheric Research, P.O. Box 3000, Boulder, CO 80307,
 * support@unidata.ucar.edu.
 * 
 * This library is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation; either version 2.1 of the License, or (at
 * your option) any later version.
 * 
 * This library is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser
 * General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public License
 * along with this library; if not, write to the Free Software Foundation,
 * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */

import java.util.Enumeration;
import java.util.Hashtable;

import javax.swing.JTree;

import javax.swing.tree.DefaultMutableTreeNode;

import javax.swing.tree.TreePath;

public class Main {
    /**
     * Call this before a JTree changes. It stores into the returned hashtable
     * state that it uses later to re-expand the paths of the jtree after its
     * structure changes.
     *
     * @param tree The jtree
     * @param root Its tree root
     *
     * @return Holds the state for later expansion
     */
    public static Hashtable initializeExpandedPathsBeforeChange(JTree tree, DefaultMutableTreeNode root) {
        Enumeration paths = tree.getExpandedDescendants(new TreePath(root.getPath()));
        Hashtable expandedPaths = new Hashtable();
        if (paths != null) {
            while (paths.hasMoreElements()) {
                TreePath treePath = (TreePath) paths.nextElement();
                expandedPaths.put(treePath.toString(), Boolean.TRUE);
            }
        }
        return expandedPaths;
    }
}

Related

1. getNodeAt(final JTree tree, final int x, final int y)
2. getNodeForEvent(JTree targetTree, DropTargetDragEvent dtde)
3. getPathStringForNode(DefaultMutableTreeNode node)
4. getSubTree(TreeNode root, String name)
5. hasOnlyLeafs(JTree tree, Object node)
6. insertNodeInAlphabeticalOrder(DefaultMutableTreeNode childNode, DefaultMutableTreeNode parentNode, DefaultTreeModel model)
7. insertStrAsNodeLexi(DefaultTreeModel treeModel, String child, DefaultMutableTreeNode parent, Boolean childIsFile)
8. isAncestor(final TreeNode node, final TreeNode parent)
9. isChildNode(DefaultMutableTreeNode parent, DefaultMutableTreeNode child)