splitpanedemo2.java

java tutotrials or beginners

/*
 * Copyright (c) 1995 - 2008 Sun Microsystems, Inc.  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 Sun Microsystems nor 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.
 */ 

package components;

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;

import java.util.*;

public class SplitPaneDemo2 extends JFrame
                            implements ListSelectionListener {
    private JLabel label;

    public SplitPaneDemo2() {
        super("SplitPaneDemo2");

        //Create an instance of SplitPaneDemo
        SplitPaneDemo splitPaneDemo = new SplitPaneDemo();
        JSplitPane top = splitPaneDemo.getSplitPane();
        splitPaneDemo.getImageList().addListSelectionListener(this);

        //XXXX: Bug #4131528, borders on nested split panes accumulate.
        //Workaround: Set the border on any split pane within
        //another split pane to null. Components within nested split
        //panes need to have their own border for this to work well.
        top.setBorder(null);

        //Create a regular old label
        label = new JLabel("Click on an image name in the list.",
                           JLabel.CENTER);

        //Create a split pane and put "top" (a split pane)
        //and JLabel instance in it.
        JSplitPane splitPane = new JSplitPane(JSplitPane.VERTICAL_SPLIT,
                                              top, label);
        splitPane.setOneTouchExpandable(true);
        splitPane.setDividerLocation(180);

        //Provide minimum sizes for the two components in the split pane
        top.setMinimumSize(new Dimension(100, 50));
        label.setMinimumSize(new Dimension(100, 30));

        //Add the split pane to this frame
        getContentPane().add(splitPane);
    }

    public void valueChanged(ListSelectionEvent e) {
        if (e.getValueIsAdjusting())
            return;

        JList theList = (JList)e.getSource();
        if (theList.isSelectionEmpty()) {
            label.setText("Nothing selected.");
        } else {
            int index = theList.getSelectedIndex();
            label.setText("Selected image number " + index);
        }
    }

    /**
     * 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 SplitPaneDemo2();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        //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();
            }
        });
    }
}