Nested Classes and Event Handling - Learning Java Through Games - page 230

green . addActionListener( new ColorListener(Color .GREEN)) ;
red . addActionListener( new ColorListener(Color .RED)) ;
blue . addActionListener( new ColorListener(Color .BLUE)) ;
class ColorListener implements ActionListener {
private Color color ;
public ColorListener () {
color = Color.RED;
} public ColorListener(Color color) {
this . color = color ;
} public void actionPerformed(ActionEvent e) {
p. changeColor( color ) ;

}

}

}

class MyPanel extends JPanel {
ArrayList < MyShape > shapes = new ArrayList < MyShape > () ;
private Color currentColor ;
public void changeColor(Color newColor) {
currentColor = newColor;
} public MyPanel () {
addMouseListener( new MouseAdapter () {
public void mousePressed (MouseEvent e ) {

if (e . getButton() == 1) {
shapes .add( new MyShape( e . getPoint ( ) , currentCo lor ) ) ;
repaint () ;
if (e . getButton() == 3) {
shapes = new ArrayList < MyShape > () ;
repaint () ;

}

}

}

);

addMouseMotionListener( new MouseMotionAdapter () {

public void mouseDragged(MouseEvent e) {

System.out . println(e. getModifiersEx()) ;
if ((e. getModifiersEx() & MouseEvent.BUTTON1DOWN MASK) ! = 0 ) {

shapes . get(shapes . size () − 1) . addPoint(e . getPoint () ) ;
repaint () ;

}

}
} );

}

public void paintComponent(Graphics g) {

super . paintComponent(g) ;
Graphics2D g2 = (Graphics2D) g ;
for (MyShape s : shapes ) {

s . drawShape(g2) ;