/** Continue to scroll to the left or right for every time step */
public void actionPerformed(ActionEvent e) {
if (directedToLeft) {
wheeler.scrollLeft();
} else {
wheeler.scrollRight();
}
}
/** Start the timer when the user presses the mouse. */
public void mousePressed(MouseEvent e) {
if (e.getSource().equals(left)) {
directedToLeft = true;
wheeler.scrollLeft();
timer.start();
} else if (e.getSource().equals(right)) {
directedToLeft = false;
wheeler.scrollRight();
timer.start();
} else if (e.getSource().equals(down)) {
menu.show(down, 5, 5);
}
}