Group RadioButton
/*
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;
}
}
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