Handle List Selection event

Description

Demo Code

/*//from  w ww . j  a v a 2  s.c  o m
 * ListSelectionDemo.java requires no other files.
 */

import javax.swing.*;
import javax.swing.event.*;
import javax.swing.table.*;

import java.util.*;
import java.awt.*;
import java.awt.event.*;

public class ListSelectionDemo extends JPanel {
    JTextArea output;
    JList list;
    JTable table;
    String newline = "\n";
    ListSelectionModel listSelectionModel;

    public ListSelectionDemo() {
        super(new BorderLayout());

        String[] listData = { "one", "two", "three", "four", "five", "six",
                "seven" };
        String[] columnNames = { "French", "Spanish", "Italian" };
        list = new JList(listData);

        listSelectionModel = list.getSelectionModel();
        listSelectionModel
                .addListSelectionListener(new SharedListSelectionHandler());
        JScrollPane listPane = new JScrollPane(list);

        JPanel controlPane = new JPanel();
        String[] modes = { "SINGLE_SELECTION", "SINGLE_INTERVAL_SELECTION",
                "MULTIPLE_INTERVAL_SELECTION" };

        final JComboBox comboBox = new JComboBox(modes);
        comboBox.setSelectedIndex(2);
        comboBox.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                String newMode = (String) comboBox.getSelectedItem();
                if (newMode.equals("SINGLE_SELECTION")) {
                    listSelectionModel
                            .setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
                } else if (newMode.equals("SINGLE_INTERVAL_SELECTION")) {
                    listSelectionModel
                            .setSelectionMode(ListSelectionModel.SINGLE_INTERVAL_SELECTION);
                } else {
                    listSelectionModel
                            .setSelectionMode(ListSelectionModel.MULTIPLE_INTERVAL_SELECTION);
                }
                output.append("----------" + "Mode: " + newMode
                        + "----------" + newline);
            }
        });
        controlPane.add(new JLabel("Selection mode:"));
        controlPane.add(comboBox);

        //Build output area.
        output = new JTextArea(1, 10);
        output.setEditable(false);
        JScrollPane outputPane = new JScrollPane(output,
                ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS,
                ScrollPaneConstants.HORIZONTAL_SCROLLBAR_AS_NEEDED);

        //Do the layout.
        JSplitPane splitPane = new JSplitPane(JSplitPane.VERTICAL_SPLIT);
        add(splitPane, BorderLayout.CENTER);

        JPanel topHalf = new JPanel();
        topHalf.setLayout(new BoxLayout(topHalf, BoxLayout.LINE_AXIS));
        JPanel listContainer = new JPanel(new GridLayout(1, 1));
        listContainer.setBorder(BorderFactory.createTitledBorder("List"));
        listContainer.add(listPane);

        topHalf.setBorder(BorderFactory.createEmptyBorder(5, 5, 0, 5));
        topHalf.add(listContainer);
        //topHalf.add(tableContainer);

        topHalf.setMinimumSize(new Dimension(100, 50));
        topHalf.setPreferredSize(new Dimension(100, 110));
        splitPane.add(topHalf);

        JPanel bottomHalf = new JPanel(new BorderLayout());
        bottomHalf.add(controlPane, BorderLayout.PAGE_START);
        bottomHalf.add(outputPane, BorderLayout.CENTER);
        //XXX: next line needed if bottomHalf is a scroll pane:
        //bottomHalf.setMinimumSize(new Dimension(400, 50));
        bottomHalf.setPreferredSize(new Dimension(450, 135));
        splitPane.add(bottomHalf);
    }

    /**
     * Create the GUI and show it.  For thread safety,
     * this method should be invoked from the
     * event-dispatching thread.
     */
    private static void createAndShowGUI() {
        //Create and set up the window.
        JFrame frame = new JFrame("ListSelectionDemo");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        //Create and set up the content pane.
        ListSelectionDemo demo = new ListSelectionDemo();
        demo.setOpaque(true);
        frame.setContentPane(demo);

        //Display the window.
        frame.pack();
        frame.setVisible(true);
    }

    public static void main(String[] args) {
        //Schedule a job for the event-dispatching thread:
        //creating and showing this application's GUI.
        javax.swing.SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                createAndShowGUI();
            }
        });
    }

    class SharedListSelectionHandler implements ListSelectionListener {
        public void valueChanged(ListSelectionEvent e) {
            ListSelectionModel lsm = (ListSelectionModel) e.getSource();

            int firstIndex = e.getFirstIndex();
            int lastIndex = e.getLastIndex();
            boolean isAdjusting = e.getValueIsAdjusting();
            output.append("Event for indexes " + firstIndex + " - "
                    + lastIndex + "; isAdjusting is " + isAdjusting
                    + "; selected indexes:");

            if (lsm.isSelectionEmpty()) {
                output.append(" <none>");
            } else {
                // Find out which indexes are selected.
                int minIndex = lsm.getMinSelectionIndex();
                int maxIndex = lsm.getMaxSelectionIndex();
                for (int i = minIndex; i <= maxIndex; i++) {
                    if (lsm.isSelectedIndex(i)) {
                        output.append(" " + i);
                    }
                }
            }
            output.append(newline);
            output.setCaretPosition(output.getDocument().getLength());
        }
    }
}

/*
 * Copyright (c) 1995, 2008, Oracle and/or its affiliates. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *   - Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *
 *   - Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 *
 *   - Neither the name of Oracle or the names of its
 *     contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
Handle List Selection event - Java Swing

Description

Demo Code

Related Tutorials
