Java JTree Collapse collapseTree(JTree tree)

Description

Collapse the tree

License

Open Source License

Parameter

Parameter	Description
tree	the tree to collapse

Declaration

public static void collapseTree(JTree tree) 

Method Source Code

//package com.java2s;
/*//from w w  w .j  av a  2  s .c o  m
The GUFF - The GNU Ultimate Framework Facility
Copyright (C) Simeosoft di Carlo Simeone
     
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 javax.swing.JTree;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.DefaultTreeModel;
import javax.swing.tree.TreePath;

public class Main {
    /**
     * Collapse the tree
     * @param tree the tree to collapse
     */
    public static void collapseTree(JTree tree) {
        final DefaultTreeModel model = (DefaultTreeModel) tree.getModel();
        final DefaultMutableTreeNode root = (DefaultMutableTreeNode) model.getRoot();
        collapseSubTree(tree, root, model);
    }

    /**
     * Collapse the subtree starting at <code>startNode</code> node
     * @param tree the tree to collapse
     * @param startNode the starting point
     * @param model the tree model
     */
    private static void collapseSubTree(JTree tree, DefaultMutableTreeNode startNode, DefaultTreeModel model) {
        if (startNode.isLeaf()) {
            return;
        }
        for (Enumeration e = startNode.children(); e.hasMoreElements();) {
            DefaultMutableTreeNode node = (DefaultMutableTreeNode) e.nextElement();
            collapseSubTree(tree, node, model);
        }
        TreePath tp = new TreePath(model.getPathToRoot(startNode));
        if (tree.isExpanded(tp)) {
            tree.collapsePath(tp);
            // senza questa istruzione, in alcuni casi non riusciamo a riportare
            // lo scrolling ad un nodo espanso
            tree.scrollPathToVisible(tp);
        }
    }
}

Related

1. collapseAll(JTree tree)
2. collapseAllNodes(JTree tree)
3. collapseAllRows(JTree tree)
4. collapseTree(JTree tree)
5. fullSelectionCollapse(JTree tree)
6. getTreeSelectedCollapsedIcon()
7. setCollapsedIcon(JTree tree, Icon icon)