If expand is true, expands all nodes in the JTree. - Java Swing

Java examples for Swing:JTree

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Description

If expand is true, expands all nodes in the JTree.

Demo Code


//package com.java2s;

import java.util.Collection;
import java.util.Enumeration;

import javax.swing.JTree;

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

public class Main {
    /**/*ww  w. j a  v a 2 s .c o m*/
     * If expand is true, expands all nodes in the tree.
     * Otherwise, collapses all nodes in the tree.
     *
     * @param tree   tree
     * @param expand true if expand all nodes
     */
    public static void expandAll(JTree tree, boolean expand) {
        if (tree == null) {
            throw new NullPointerException("tree == null");
        }
        TreeNode root = (TreeNode) tree.getModel().getRoot();
        // Traverse tree from root
        expandAll(tree, new TreePath(root), expand);
    }

    /**
     * Expands or collapses a path and all it's sub paths.
     *
     * @param tree   tree
     * @param parent parent path
     * @param expand true if expand, false if collapse
     *
     */
    @SuppressWarnings("unchecked")
    public static void expandAll(JTree tree, TreePath parent, boolean expand) {
        if (tree == null) {
            throw new NullPointerException("tree == null");
        }
        if (parent == null) {
            throw new NullPointerException("parent == null");
        }
        // Traverse children
        TreeNode node = (TreeNode) parent.getLastPathComponent();

        if (node.getChildCount() >= 0) {
            for (Enumeration<TreeNode> e = node.children(); e
                    .hasMoreElements();) {
                TreeNode n = 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);
        }
    }

    /**
     * Expands or collapses tree paths and all it's sub paths.
     *
     * @param tree        tree
     * @param parentPaths parent paths
     * @param expand      true if expand, false if collapse
     *
     */
    public static void expandAll(JTree tree,
            Collection<? extends TreePath> parentPaths, boolean expand) {
        if (tree == null) {
            throw new NullPointerException("tree == null");
        }
        if (parentPaths == null) {
            throw new NullPointerException("parentPaths == null");
        }
        for (TreePath treePath : parentPaths) {
            expandAll(tree, treePath, expand);
        }
    }

    /**
     * ?ffnet den Tree auch, wenn das letzte Element eines Pfads ein Blatt ist.
     *
     * @param tree Tree
     * @param path Pfad
     */
    public static void expandPath(JTree tree, TreePath path) {
        if (tree == null) {
            throw new NullPointerException("tree == null");
        }
        if (path == null) {
            throw new NullPointerException("path == null");
        }
        TreePath expandPath = path;
        if (tree.getModel().isLeaf(path.getLastPathComponent())) {
            expandPath = path.getParentPath();
        }
        tree.expandPath(expandPath);
    }
}

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