Checkbox using Swing

[sahitya]

Hi

I have few queries regarding Check Box.

1. How to make a checkbox non editable?
2. How to attach an image to the checkbox?

Please help.

[ramesh kancherla]

see checkBox constructors

[Maneesh Godbole]

Originally posted by sahitya sahitya:

1. How to make a checkbox non editable?
2. How to attach an image to the checkbox?

Check this out.

[ramesh kancherla]

setEnabled(false)

JCheckBox(Icon icon);

[Rob Spoor]

setIcon(Icon) should also work.

[Darryl Burke]

Originally posted by Rob Prime:
setIcon(Icon) should also work.

Actually it doesn't, inasmuch as the icon will replace the default icon, which is the square with the check.

This is a partially implemented UI delegate which paints a custom icon in addition to the default one, in the text area of the JCheckBox.

import java.awt.Color;
import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Rectangle;
import java.awt.image.BufferedImage;
import javax.swing.Icon;
import javax.swing.ImageIcon;
import javax.swing.JCheckBox;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.SwingUtilities;
import javax.swing.plaf.basic.BasicCheckBoxUI;
 
public class CheckBoxWithExtraIcon {
   
   Icon getIcon(int w, int h) {
      BufferedImage bi = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB);
      Graphics2D g2 = bi.createGraphics();
      g2.setColor(Color.YELLOW);
      g2.fillRect(0, 0, w, h);
      g2.setColor(Color.RED);
      g2.fillOval(3, 3, w - 6, h - 6);
      
      ImageIcon icon = new ImageIcon(bi);
      return icon;
   }
   
   void makeUI() {
      JFrame frame = new JFrame("CheckBox with extra icon");
      frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      frame.setLayout(new FlowLayout());
      frame.setSize(200, 100);
      frame.setLocationRelativeTo(null);
      
      IconCheckBox iconCheckBox = new IconCheckBox("CheckBox", getIcon(20, 20));
      frame.add(iconCheckBox);
      frame.setVisible(true);
   }
   
   public static void main(String[] args) {
      SwingUtilities.invokeLater(new Runnable() {
         public void run() {
            new CheckBoxWithExtraIcon().makeUI();
         }
      });
   }
}
 
class IconCheckBox extends JCheckBox {
   
   Icon customIcon;
   IconCheckBox iconCheckBox = this;
   
   public IconCheckBox(String text, Icon icon) {
      setText(text);
      customIcon = icon;
      setUI(new BasicCheckBoxUI() {
         
         @Override
         protected void paintText(Graphics g, JComponent c, Rectangle textRect, String text) {
            int x = (int) textRect.getX();
            int y = (int) textRect.getY();
            
            Graphics scratchGraphics = g.create();
            scratchGraphics.setClip(x, y, customIcon.getIconWidth(), customIcon.getIconHeight());
            customIcon.paintIcon(iconCheckBox, scratchGraphics, x, y);
            scratchGraphics.dispose();
            
            super.paintText(g, c,
                  new Rectangle(x + customIcon.getIconWidth() + iconCheckBox.getIconTextGap(), y,
                  (int) textRect.width, (int) textRect.height), text);
         }
      });
   }
   
   @Override
   public Dimension getPreferredSize() {
      Dimension dim = super.getPreferredSize();
      return new Dimension(dim.width + customIcon.getIconWidth() + getIconTextGap(),
            Math.max(dim.height, customIcon.getIconHeight() + getIconTextGap()));
   }
   
   @Override
   public void setIcon(Icon icon) {
      if (customIcon == icon) {
         return;
      }
      customIcon = icon;
      repaint();
   }
}

A fuller implementation would also need to override setPreferredSize and get/set Size, Maximum/Minimum Size .. (maybe get/setBounds, too.. haven't really thought about it).