SwingScrollBarExample.java Source code

Introduction

Here is the source code for SwingScrollBarExample.java

Source

/*
Java Swing, 2nd Edition
By Marc Loy, Robert Eckstein, Dave Wood, James Elliott, Brian Cole
ISBN: 0-596-00408-7
Publisher: O'Reilly 
*/
// SwingScrollBarExample.java
// A quick demonstration of JScrollBar (both vertical and horizontal).
//

import java.awt.BorderLayout;
import java.awt.event.AdjustmentEvent;
import java.awt.event.AdjustmentListener;

import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollBar;

public class SwingScrollBarExample extends JPanel {

    JLabel label;

    public SwingScrollBarExample() {
        super(true);
        label = new JLabel();
        setLayout(new BorderLayout());

        JScrollBar hbar = new JScrollBar(JScrollBar.HORIZONTAL, 30, 20, 0, 300);
        JScrollBar vbar = new JScrollBar(JScrollBar.VERTICAL, 30, 40, 0, 300);

        hbar.setUnitIncrement(2);
        hbar.setBlockIncrement(1);

        hbar.addAdjustmentListener(new MyAdjustmentListener());
        vbar.addAdjustmentListener(new MyAdjustmentListener());

        add(hbar, BorderLayout.SOUTH);
        add(vbar, BorderLayout.EAST);
        add(label, BorderLayout.CENTER);
    }

    class MyAdjustmentListener implements AdjustmentListener {
        public void adjustmentValueChanged(AdjustmentEvent e) {
            label.setText("    New Value is " + e.getValue() + "      ");
            repaint();
        }
    }

    public static void main(String s[]) {
        JFrame frame = new JFrame("Scroll Bar Example");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setContentPane(new SwingScrollBarExample());
        frame.setSize(200, 200);
        frame.setVisible(true);
    }
}