GroupRadio.java Source code

Introduction

Here is the source code for GroupRadio.java

Source

/*
Definitive Guide to Swing for Java 2, Second Edition
By John Zukowski       
ISBN: 1-893115-78-X
Publisher: APress
*/

import java.awt.BorderLayout;
import java.awt.Component;
import java.awt.Container;
import java.awt.GridLayout;
import java.awt.event.ActionListener;
import java.awt.event.ItemListener;
import java.util.Enumeration;
import java.util.Vector;

import javax.swing.AbstractButton;
import javax.swing.BorderFactory;
import javax.swing.ButtonGroup;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JRadioButton;
import javax.swing.border.Border;
import javax.swing.event.ChangeListener;

public class GroupRadio {
    private static final String sliceOptions[] = { "4 slices", "8 slices", "12 slices", "16 slices" };

    private static final String crustOptions[] = { "Sicilian", "Thin Crust", "Thick Crust", "Stuffed Crust" };

    public static void main(String args[]) {
        JFrame frame = new JFrame("Grouping Example");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        Container sliceContainer = RadioButtonUtils.createRadioButtonGrouping(sliceOptions, "Slice Count");
        Container crustContainer = RadioButtonUtils.createRadioButtonGrouping(crustOptions, "Crust Type");
        Container contentPane = frame.getContentPane();
        contentPane.add(sliceContainer, BorderLayout.WEST);
        contentPane.add(crustContainer, BorderLayout.EAST);
        frame.setSize(300, 200);
        frame.setVisible(true);
    }
}

class RadioButtonUtils {
    private RadioButtonUtils() {
        // private constructor so you can't create instances
    }

    public static Enumeration getSelectedElements(Container container) {
        Vector selections = new Vector();
        Component components[] = container.getComponents();
        for (int i = 0, n = components.length; i < n; i++) {
            if (components[i] instanceof AbstractButton) {
                AbstractButton button = (AbstractButton) components[i];
                if (button.isSelected()) {
                    selections.addElement(button.getText());
                }
            }
        }
        return selections.elements();
    }

    public static Container createRadioButtonGrouping(String elements[]) {
        return createRadioButtonGrouping(elements, null, null, null, null);
    }

    public static Container createRadioButtonGrouping(String elements[], String title) {
        return createRadioButtonGrouping(elements, title, null, null, null);
    }

    public static Container createRadioButtonGrouping(String elements[], String title, ItemListener itemListener) {
        return createRadioButtonGrouping(elements, title, null, itemListener, null);
    }

    public static Container createRadioButtonGrouping(String elements[], String title,
            ActionListener actionListener) {
        return createRadioButtonGrouping(elements, title, actionListener, null, null);
    }

    public static Container createRadioButtonGrouping(String elements[], String title,
            ActionListener actionListener, ItemListener itemListener) {
        return createRadioButtonGrouping(elements, title, actionListener, itemListener, null);
    }

    public static Container createRadioButtonGrouping(String elements[], String title,
            ActionListener actionListener, ItemListener itemListener, ChangeListener changeListener) {
        JPanel panel = new JPanel(new GridLayout(0, 1));
        //    If title set, create titled border
        if (title != null) {
            Border border = BorderFactory.createTitledBorder(title);
            panel.setBorder(border);
        }
        //    Create group
        ButtonGroup group = new ButtonGroup();
        JRadioButton aRadioButton;
        //    For each String passed in:
        //    Create button, add to panel, and add to group
        for (int i = 0, n = elements.length; i < n; i++) {
            aRadioButton = new JRadioButton(elements[i]);
            panel.add(aRadioButton);
            group.add(aRadioButton);
            if (actionListener != null) {
                aRadioButton.addActionListener(actionListener);
            }
            if (itemListener != null) {
                aRadioButton.addItemListener(itemListener);
            }
            if (changeListener != null) {
                aRadioButton.addChangeListener(changeListener);
            }
        }
        return panel;
    }
}