jdk

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/*
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 * Copyright (c) 2007, 2021, Oracle and/or its affiliates. All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 *
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 *   - Redistributions of source code must retain the above copyright
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 *     notice, this list of conditions and the following disclaimer.
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 *
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 *   - Redistributions in binary form must reproduce the above copyright
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 *     notice, this list of conditions and the following disclaimer in the
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 *     documentation and/or other materials provided with the distribution.
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 *
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 *   - Neither the name of Oracle nor the names of its
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 *     contributors may be used to endorse or promote products derived
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 *     from this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
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 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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import javax.swing.JScrollPane;
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import javax.swing.JTree;
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import javax.swing.tree.DefaultMutableTreeNode;
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import java.awt.BorderLayout;
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import java.awt.Insets;
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import java.io.BufferedReader;
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import java.io.IOException;
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import java.io.InputStream;
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import java.io.InputStreamReader;
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import java.net.URL;
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import static java.nio.charset.StandardCharsets.UTF_8;
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/**
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 * JTree Demo
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 *
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 * @author Jeff Dinkins
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 */
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public class TreeDemo extends DemoModule {
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    JTree tree;
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    /**
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     * main method allows us to run as a standalone demo.
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     */
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    public static void main(String[] args) {
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        TreeDemo demo = new TreeDemo(null);
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        demo.mainImpl();
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    }
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    /**
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     * TreeDemo Constructor
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     */
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    public TreeDemo(SwingSet2 swingset) {
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        // Set the title for this demo, and an icon used to represent this
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        // demo inside the SwingSet2 app.
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        super(swingset, "TreeDemo", "toolbar/JTree.gif");
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        getDemoPanel().add(createTree(), BorderLayout.CENTER);
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    }
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    public JScrollPane createTree() {
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        DefaultMutableTreeNode top = new DefaultMutableTreeNode(getString("TreeDemo.music"));
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        DefaultMutableTreeNode category = null;
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        DefaultMutableTreeNode artist = null;
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        DefaultMutableTreeNode record = null;
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        // open tree data
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        URL url = getClass().getResource("/resources/tree.txt");
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        try {
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            // convert url to buffered string
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            InputStream is = url.openStream();
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            InputStreamReader isr = new InputStreamReader(is, UTF_8);
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            BufferedReader reader = new BufferedReader(isr);
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            // read one line at a time, put into tree
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            String line = reader.readLine();
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            while(line != null) {
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                // System.out.println("reading in: ->" + line + "<-");
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                char linetype = line.charAt(0);
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                switch(linetype) {
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                   case 'C':
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                     category = new DefaultMutableTreeNode(line.substring(2));
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                     top.add(category);
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                     break;
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                   case 'A':
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                     if(category != null) {
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                         category.add(artist = new DefaultMutableTreeNode(line.substring(2)));
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                     }
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                     break;
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                   case 'R':
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                     if(artist != null) {
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                         artist.add(record = new DefaultMutableTreeNode(line.substring(2)));
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                     }
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                     break;
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                   case 'S':
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                     if(record != null) {
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                         record.add(new DefaultMutableTreeNode(line.substring(2)));
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                     }
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                     break;
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                   default:
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                     break;
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                }
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                line = reader.readLine();
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            }
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        } catch (IOException e) {
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        }
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        tree = new JTree(top) {
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            public Insets getInsets() {
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                return new Insets(5,5,5,5);
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            }
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        };
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        tree.setEditable(true);
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        return new JScrollPane(tree);
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    }
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    void updateDragEnabled(boolean dragEnabled) {
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        tree.setDragEnabled(dragEnabled);
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    }
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}
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