JHotDrawInteractiveDisplay2D.java 文件源码

/**
    * Add new event handler. Depending on the interfaces implemented by
    * <code>handler</code> calls {@link Component#addKeyListener(KeyListener)},
    * {@link Component#addMouseListener(MouseListener)},
    * {@link Component#addMouseMotionListener(MouseMotionListener)},
    * {@link Component#addMouseWheelListener(MouseWheelListener)}.
    */
   @Override
public void addHandler( final Object handler )
   {
       if ( KeyListener.class.isInstance( handler ) )
           addKeyListener( ( KeyListener ) handler );

       if ( MouseMotionListener.class.isInstance( handler ) )
           addMouseMotionListener( ( MouseMotionListener ) handler );

       if ( MouseListener.class.isInstance( handler ) )
           addMouseListener( ( MouseListener ) handler );

       if ( MouseWheelListener.class.isInstance( handler ) )
           addMouseWheelListener( ( MouseWheelListener ) handler );
   }