// Handle button released.
public void mouseReleased(MouseEvent me) {
// save coordinates
mouseX = me.getX();
mouseY = me.getY();
msg = "Up";
repaint();
}
// Handle mouse dragged.
public void mouseDragged(MouseEvent me) {
// save coordinates
mouseX = me.getX();
mouseY = me.getY();
msg = "*";
showStatus("Dragging mouse at " + mouseX + ", " + mouseY);
repaint();
}
// Handle mouse moved.
public void mouseMoved(MouseEvent me) {
// show status
showStatus("Moving mouse at " + me.getX() + ", " + me.getY());
}
// Display msg in applet window at current X,Y location.
public void paint(Graphics g) {
g.drawString(msg, mouseX, mouseY);
}
}
Sample output from this program is shown here:
Let's look closely at this example. The MouseEvents class extends Applet and implements
both the MouseListener and MouseMotionListener interfaces. These two interfaces contain
methods that receive and process the various types of mouse events. Notice that the applet
is both the source and the listener for these events. This works because Component, which
supplies the addMouseListener( ) and addMouseMotionListener( ) methods, is a superclass
of Applet. Being both the source and the listener for events is a common situation for applets.
Inside init( ), the applet registers itself as a listener for mouse events. This is done by using
addMouseListener( ) and addMouseMotionListener( ), which, as mentioned, are members
of Component. They are shown here:
void addMouseListener(MouseListener ml)
void addMouseMotionListener(MouseMotionListener mml)
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