IconCheckBoxSample.java Source code

Introduction

Here is the source code for IconCheckBoxSample.java

Source

import java.awt.Color;
import java.awt.Component;
import java.awt.Container;
import java.awt.Graphics;
import java.awt.GridLayout;
import java.awt.Image;
import java.awt.Polygon;

import javax.swing.AbstractButton;
import javax.swing.ButtonModel;
import javax.swing.Icon;
import javax.swing.ImageIcon;
import javax.swing.JCheckBox;
import javax.swing.JFrame;

public class IconCheckBoxSample {
    private static class CheckBoxIcon implements Icon {
        private ImageIcon checkedIcon = new ImageIcon("Plus.gif");

        private ImageIcon uncheckedIcon = new ImageIcon("Minus.gif");

        public void paintIcon(Component component, Graphics g, int x, int y) {
            AbstractButton abstractButton = (AbstractButton) component;
            ButtonModel buttonModel = abstractButton.getModel();
            g.translate(x, y);
            ImageIcon imageIcon = buttonModel.isSelected() ? checkedIcon : uncheckedIcon;
            Image image = imageIcon.getImage();
            g.drawImage(image, 0, 0, component);
            g.translate(-x, -y);
        }

        public int getIconWidth() {
            return 20;
        }

        public int getIconHeight() {
            return 20;
        }
    }

    public static void main(String args[]) {
        JFrame frame = new JFrame("Iconizing CheckBox");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        Icon checked = new DiamondIcon(Color.black, true);
        Icon unchecked = new DiamondIcon(Color.black, false);
        JCheckBox aCheckBox1 = new JCheckBox("Pizza", unchecked);
        aCheckBox1.setSelectedIcon(checked);
        JCheckBox aCheckBox2 = new JCheckBox("Calzone");
        aCheckBox2.setIcon(unchecked);
        aCheckBox2.setSelectedIcon(checked);
        Icon checkBoxIcon = new CheckBoxIcon();
        JCheckBox aCheckBox3 = new JCheckBox("Anchovies", checkBoxIcon);
        JCheckBox aCheckBox4 = new JCheckBox("Stuffed Crust", checked);
        Container contentPane = frame.getContentPane();
        contentPane.setLayout(new GridLayout(0, 1));
        contentPane.add(aCheckBox1);
        contentPane.add(aCheckBox2);
        contentPane.add(aCheckBox3);
        contentPane.add(aCheckBox4);
        frame.setSize(300, 200);
        frame.setVisible(true);
    }
}

class DiamondIcon implements Icon {
    private Color color;

    private boolean selected;

    private int width;

    private int height;

    private Polygon poly;

    private static final int DEFAULT_WIDTH = 10;

    private static final int DEFAULT_HEIGHT = 10;

    public DiamondIcon(Color color) {
        this(color, true, DEFAULT_WIDTH, DEFAULT_HEIGHT);
    }

    public DiamondIcon(Color color, boolean selected) {
        this(color, selected, DEFAULT_WIDTH, DEFAULT_HEIGHT);
    }

    public DiamondIcon(Color color, boolean selected, int width, int height) {
        this.color = color;
        this.selected = selected;
        this.width = width;
        this.height = height;
        initPolygon();
    }

    private void initPolygon() {
        poly = new Polygon();
        int halfWidth = width / 2;
        int halfHeight = height / 2;
        poly.addPoint(0, halfHeight);
        poly.addPoint(halfWidth, 0);
        poly.addPoint(width, halfHeight);
        poly.addPoint(halfWidth, height);
    }

    public int getIconHeight() {
        return height;
    }

    public int getIconWidth() {
        return width;
    }

    public void paintIcon(Component c, Graphics g, int x, int y) {
        g.setColor(color);
        g.translate(x, y);
        if (selected) {
            g.fillPolygon(poly);
        } else {
            g.drawPolygon(poly);
        }
        g.translate(-x, -y);
    }
}