Getting MouseListener on panel containing canvas'

Question

Hi.
I'm using Java 1.2 and AWT, and have created a simple colour scale.
At the moment, I am trying to code it so that clicking on one square within the scale will highlight it. To do this I tried adding a MouseListener to the scale itself --- but this didn't seem to work.
Any help would be much appreciated!
public class ColourScale extends java.awt.Panel {
    private ColourSquare cs[];
    private int csNum;
    private boolean squareNum;
    private java.awt.GridBagConstraints gridBagConstraints;
    /** Creates a new instance of ColourScale */
    public ColourScale(int cn) {
        int i = 0;
        csNum = 0;
        squareNum = true;
        cs = new ColourSquare[6];
        for (i = 0; i < 6; i++) {
            cs[i] = new ColourSquare();
        addMouseListener(new java.awt.event.MouseAdapter() {
            public void mouseClicked(java.awt.event.MouseEvent evt) {
                java.awt.Point pt = evt.getPoint();
                for(int i = 0; i < csNum; i++) {
                    if (cs.contains(pt)) {
cs[i].setMyBorder(true);
} else {
if(squareNum) {
cs[i].setMyBorder(false);
if (cn > 6 || cn < -1) {
cn = 6;
setCsNum(cn);
setLayout(new java.awt.GridLayout());
gridBagConstraints = new java.awt.GridBagConstraints();
gridBagConstraints.gridy = 0;
for(i = 0; i < cn; i++) {
gridBagConstraints.gridx = i;
gridBagConstraints.insets = new java.awt.Insets(4, 4, 4, 4);
add(cs[i]);
class ColourSquare extends java.awt.Canvas {
private int bgColour;
private boolean border;
ColourSquare() {
super();
bgColour = 0;
border = false;
setSize(new java.awt.Dimension(15, 15));
// addMouseListener(new java.awt.event.MouseAdapter() {
// public void mouseClicked(java.awt.event.MouseEvent evt) {
// ColourSquare c = (ColourSquare) evt.getSource();
// c.setMyBorder(!c.getMyBorder());
public int getBgColour() {
return bgColour;
public void setBgColour (int newC) {
bgColour = newC;
repaint();
public boolean getMyBorder() {
return border;
public void setMyBorder(boolean newB) {
border = newB;
repaint();
public void paint(java.awt.Graphics g) {
// changes square colours, and draws border around square...

Answer 1

Here's something:import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class Test extends JFrame {
    public Test () {
        setContentPane (new TestPanel ());
        setDefaultCloseOperation (EXIT_ON_CLOSE);
        setTitle ("Test");
        pack ();
        setLocationRelativeTo (null);
        setVisible (true);
    public static void main (String[] parameters) {
        new Test ();
    private class TestPanel extends JPanel {
        private final int cx = 3;
        private final int cy = 3;
        private ClickablePanel[][] clickablePanels;
        private ClickablePanel selectedPanel;
        public TestPanel () {
            setLayout (new GridLayout (cx, cy));
            clickablePanels = new ClickablePanel[cy][cx];
            for (int r = 0; r < cy; r ++) {
                for (int c = 0; c < cx; c ++) {
                    clickablePanels[r][c] = new ClickablePanel ();
                    add (clickablePanels[r][c]);
            selectedPanel = null;
            addMouseListener (new MouseAdapter () {
                public void mouseClicked (MouseEvent event) {
                    selectedPanel = (ClickablePanel) findComponentAt (event.getPoint ());
                    for (int r = 0; r < cy; r ++) {
                        for (int c = 0; c < cx; c ++) {
                            clickablePanels[r][c].setSelected (clickablePanels[r][c] == selectedPanel);
                            clickablePanels[r][c].repaint ();
        public Dimension getPreferredSize () {
            return new Dimension (cx * 50, cy * 50);
        private class ClickablePanel extends JPanel {
            private boolean selected;
            public ClickablePanel () {
                selected = false;
            public void setSelected (boolean selected) {
                this.selected = selected;
            public void paintComponent (Graphics g) {
                super.paintComponent (g);
                int w = getWidth ();
                int h = getHeight ();
                g.drawLine (0, 0, 0, h);
                g.drawLine (0, h, w, h);
                g.drawLine (w, h, w, 0);
                g.drawLine (w, 0, 0, 0);
                if (selected) {
                    g.drawLine (0, 0, w, h);
                    g.drawLine (0, h, w, 0);
}Kind regards,
  Levi