Source Code : CheckBox Menu Sample

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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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