CheckBox Menu Sample
/*
Definitive Guide to Swing for Java 2, Second Edition
By John Zukowski
ISBN: 1-893115-78-X
Publisher: APress
*/
import java.awt.Color;
import java.awt.Component;
import java.awt.Graphics;
import java.awt.Polygon;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
import java.awt.event.KeyEvent;
import javax.swing.AbstractButton;
import javax.swing.Icon;
import javax.swing.ImageIcon;
import javax.swing.JCheckBoxMenuItem;
import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.UIManager;
public class CheckBoxSample {
static Icon boyIcon = new ImageIcon("boy-r.jpg");
static Icon girlIcon = new ImageIcon("girl-r.jpg");
public static void main(String args[]) {
ActionListener aListener = new ActionListener() {
public void actionPerformed(ActionEvent event) {
AbstractButton aButton = (AbstractButton) event.getSource();
boolean selected = aButton.getModel().isSelected();
String newLabel;
Icon newIcon;
if (selected) {
newLabel = "Girl";
newIcon = girlIcon;
} else {
newLabel = "Boy";
newIcon = boyIcon;
}
aButton.setText(newLabel);
aButton.setIcon(newIcon);
}
};
ItemListener iListener = new ItemListener() {
public void itemStateChanged(ItemEvent event) {
AbstractButton aButton = (AbstractButton) event.getSource();
int state = event.getStateChange();
String newLabel;
Icon newIcon;
if (state == ItemEvent.SELECTED) {
newLabel = "Girl";
newIcon = girlIcon;
} else {
newLabel = "Boy";
newIcon = boyIcon;
}
aButton.setText(newLabel);
aButton.setIcon(newIcon);
}
};
JFrame frame = new JFrame("CheckBox Example");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JMenuBar bar = new JMenuBar();
JMenu menu = new JMenu("Menu");
menu.setMnemonic(KeyEvent.VK_M);
JCheckBoxMenuItem one = new JCheckBoxMenuItem();
menu.add(one);
JCheckBoxMenuItem two = new JCheckBoxMenuItem("Boy");
menu.add(two);
JCheckBoxMenuItem three = new JCheckBoxMenuItem(boyIcon);
menu.add(three);
JCheckBoxMenuItem four = new JCheckBoxMenuItem("Girl", true);
menu.add(four);
JCheckBoxMenuItem five = new JCheckBoxMenuItem("Boy", boyIcon);
five.addItemListener(iListener);
menu.add(five);
Icon stateIcon = new DiamondAbstractButtonStateIcon(Color.black);
UIManager.put("CheckBoxMenuItem.checkIcon", stateIcon);
JCheckBoxMenuItem six = new JCheckBoxMenuItem("Girl", girlIcon, true);
six.addActionListener(aListener);
menu.add(six);
bar.add(menu);
frame.setJMenuBar(bar);
frame.setSize(350, 250);
frame.setVisible(true);
}
}
class DiamondAbstractButtonStateIcon implements Icon {
private final int width = 10;
private final int height = 10;
private Color color;
private Polygon polygon;
public DiamondAbstractButtonStateIcon(Color color) {
this.color = color;
initPolygon();
}
private void initPolygon() {
polygon = new Polygon();
int halfWidth = width / 2;
int halfHeight = height / 2;
polygon.addPoint(0, halfHeight);
polygon.addPoint(halfWidth, 0);
polygon.addPoint(width, halfHeight);
polygon.addPoint(halfWidth, height);
}
public int getIconHeight() {
return width;
}
public int getIconWidth() {
return height;
}
public void paintIcon(Component component, Graphics g, int x, int y) {
boolean selected = false;
g.setColor(color);
g.translate(x, y);
if (component instanceof AbstractButton) {
AbstractButton abstractButton = (AbstractButton) component;
selected = abstractButton.isSelected();
}
if (selected) {
g.fillPolygon(polygon);
} else {
g.drawPolygon(polygon);
}
g.translate(-x, -y);
}
}
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