import java.awt.event.*;

/**
 * A listener for image buttons.<p>
 *
 * An ImageButtonListener is both a MouseListener (by way of
 * extending MouseAdapter) and a MouseMotionListener.  
 * MouseMotionListener only has two abstract methods:<pre>
 *
 *    void mouseMoved  (MouseEvent event)
 *    void mouseDragged(MouseEvent event)</pre>
 * 
 * In addition, ImageButtonListener adds some abstract method
 * definitions of its own:
 *
 *    void activate(ImageButton)
 *    void arm     (ImageButton)
 *    void disarm  (ImageButton)
 
 * @version 1.0, Dec 19 1996
 *
 * @author  David Geary
 * @see     java.awt.event.MouseListener
 * @see     java.awt.event.MouseAdapter
 * @see     java.awt.event.MouseMotionListener
 *
 * @see     ImageButton
 * @see     SpringyImageButtonListener
 * @see     StickyImageButtonListener
 * @see     gjt.test.ImageButtonTest
 */

abstract public class ImageButtonListener 
	extends MouseAdapter implements MouseMotionListener {

        protected boolean button_armed = false;

	abstract public void activate  (ImageButton button);
	abstract public void arm       (ImageButton button);
	abstract public void disarm    (ImageButton button);

    public synchronized void mousePressed (MouseEvent me) {
        ImageButton ib = (ImageButton)me.getComponent ();
        if (! ib.isDisabled ())
            arm (ib);
    }

    public synchronized void mouseClicked (MouseEvent me) {
        ImageButton ib = (ImageButton)me.getComponent ();
        if (! ib.isDisabled ()
          && button_armed ) // && ib.isArmed ())
            activate  (ib);
    }

    public synchronized void mouseReleased (MouseEvent me) {
        ImageButton ib = (ImageButton)me.getComponent ();
        if (ib.contains (me.getPoint ().x, me.getPoint ().y)
          && ! ib.isDisabled ()
          && button_armed ) // && ib.isArmed  ())
            activate  (ib);
    }

    public synchronized void mouseDragged (MouseEvent me) {
        ImageButton ib = (ImageButton)me.getComponent ();
        if (! ib.isDisabled ()) {
            int x = me.getPoint ().x;
            int y = me.getPoint ().y;

            if (ib.contains (x,y))
                arm (ib);
            else
                disarm (ib);
        }
    }

    public synchronized void mouseMoved (MouseEvent event) { }
}