ScrollDemo2.java Source code

Introduction

Here is the source code for ScrollDemo2.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 
*/
// ScrollDemo2.java
//Another JScrollPane demonstration. This version activates some of the
//features of JScrollPane such as row and column headers.
//

import java.awt.BorderLayout;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.ButtonGroup;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JRadioButton;
import javax.swing.JScrollPane;
import javax.swing.JViewport;
import javax.swing.ScrollPaneConstants;

public class ScrollDemo2 extends JFrame {

    JScrollPane scrollpane;

    public ScrollDemo2() {
        super("JScrollPane Demonstration");
        setSize(300, 200);
        setDefaultCloseOperation(EXIT_ON_CLOSE);
        init();
        setVisible(true);
    }

    public void init() {
        JRadioButton form[][] = new JRadioButton[12][5];
        String counts[] = { "", "0-1", "2-5", "6-10", "11-100", "101+" };
        String categories[] = { "Household", "Office", "Extended Family", "Company (US)", "Company (World)", "Team",
                "Will", "Birthday Card List", "High School", "Country", "Continent", "Planet" };
        JPanel p = new JPanel();
        p.setSize(600, 400);
        p.setLayout(new GridLayout(13, 6, 10, 0));
        for (int row = 0; row < 13; row++) {
            ButtonGroup bg = new ButtonGroup();
            for (int col = 0; col < 6; col++) {
                if (row == 0) {
                    p.add(new JLabel(counts[col]));
                } else {
                    if (col == 0) {
                        p.add(new JLabel(categories[row - 1]));
                    } else {
                        form[row - 1][col - 1] = new JRadioButton();
                        bg.add(form[row - 1][col - 1]);
                        p.add(form[row - 1][col - 1]);
                    }
                }
            }
        }
        scrollpane = new JScrollPane(p);

        // Add in some JViewports for the column and row headers
        JViewport jv1 = new JViewport();
        jv1.setView(new JLabel(new ImageIcon("columnlabel.gif")));
        scrollpane.setColumnHeader(jv1);
        JViewport jv2 = new JViewport();
        jv2.setView(new JLabel(new ImageIcon("rowlabel.gif")));
        scrollpane.setRowHeader(jv2);

        // And throw in an information button
        JButton jb1 = new JButton(new ImageIcon("question.gif"));
        jb1.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent ae) {
                JOptionPane.showMessageDialog(null, "This is an Active Corner!", "Information",
                        JOptionPane.INFORMATION_MESSAGE);
            }
        });
        scrollpane.setCorner(ScrollPaneConstants.UPPER_LEFT_CORNER, jb1);
        getContentPane().add(scrollpane, BorderLayout.CENTER);
    }

    public static void main(String args[]) {
        new ScrollDemo2();
    }
}