- /*
- * @(#)DropTargetAdapter.java 1.7 03/12/19
- *
- * Copyright 2004 Sun Microsystems, Inc. All rights reserved.
- * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
- */
-
- package java.awt.dnd;
-
- /**
- * An abstract adapter class for receiving drop target events. The methods in
- * this class are empty. This class exists only as a convenience for creating
- * listener objects.
- * <p>
- * Extend this class to create a <code>DropTargetEvent</code> listener
- * and override the methods for the events of interest. (If you implement the
- * <code>DropTargetListener</code> interface, you have to define all of
- * the methods in it. This abstract class defines a null implementation for
- * every method except <code>drop(DropTargetDropEvent)</code>, so you only have
- * to define methods for events you care about.) You must provide an
- * implementation for at least <code>drop(DropTargetDropEvent)</code>. This
- * method cannot have a null implementation because its specification requires
- * that you either accept or reject the drop, and, if accepted, indicate
- * whether the drop was successful.
- * <p>
- * Create a listener object using the extended class and then register it with
- * a <code>DropTarget</code>. When the drag enters, moves over, or exits
- * the operable part of the drop site for that <code>DropTarget</code>, when
- * the drop action changes, and when the drop occurs, the relevant method in
- * the listener object is invoked, and the <code>DropTargetEvent</code> is
- * passed to it.
- * <p>
- * The operable part of the drop site for the <code>DropTarget</code> is
- * the part of the associated <code>Component</code>'s geometry that is not
- * obscured by an overlapping top-level window or by another
- * <code>Component</code> higher in the Z-order that has an associated active
- * <code>DropTarget</code>.
- * <p>
- * During the drag, the data associated with the current drag operation can be
- * retrieved by calling <code>getTransferable()</code> on
- * <code>DropTargetDragEvent</code> instances passed to the listener's
- * methods.
- * <p>
- * Note that <code>getTransferable()</code> on the
- * <code>DropTargetDragEvent</code> instance should only be called within the
- * respective listener's method and all the necessary data should be retrieved
- * from the returned <code>Transferable</code> before that method returns.
- *
- * @see DropTargetEvent
- * @see DropTargetListener
- *
- * @author David Mendenhall
- * @version 1.7, 12/19/03
- * @since 1.4
- */
- public abstract class DropTargetAdapter implements DropTargetListener {
-
- /**
- * Called while a drag operation is ongoing, when the mouse pointer enters
- * the operable part of the drop site for the <code>DropTarget</code>
- * registered with this listener.
- *
- * @param dtde the <code>DropTargetDragEvent</code>
- */
- public void dragEnter(DropTargetDragEvent dtde) {}
-
- /**
- * Called when a drag operation is ongoing, while the mouse pointer is still
- * over the operable part of the drop site for the <code>DropTarget</code>
- * registered with this listener.
- *
- * @param dtde the <code>DropTargetDragEvent</code>
- */
- public void dragOver(DropTargetDragEvent dtde) {}
-
- /**
- * Called if the user has modified
- * the current drop gesture.
- *
- * @param dtde the <code>DropTargetDragEvent</code>
- */
- public void dropActionChanged(DropTargetDragEvent dtde) {}
-
- /**
- * Called while a drag operation is ongoing, when the mouse pointer has
- * exited the operable part of the drop site for the
- * <code>DropTarget</code> registered with this listener.
- *
- * @param dte the <code>DropTargetEvent</code>
- */
- public void dragExit(DropTargetEvent dte) {}
- }