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110 lines
3.7 KiB
110 lines
3.7 KiB
/*
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* Copyright (c) 2001, 2003, Oracle and/or its affiliates. All rights reserved.
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* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*/
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package java.awt.dnd;
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/**
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* An abstract adapter class for receiving drop target events. The methods in
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* this class are empty. This class exists only as a convenience for creating
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* listener objects.
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* <p>
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* Extend this class to create a <code>DropTargetEvent</code> listener
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* and override the methods for the events of interest. (If you implement the
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* <code>DropTargetListener</code> interface, you have to define all of
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* the methods in it. This abstract class defines a null implementation for
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* every method except <code>drop(DropTargetDropEvent)</code>, so you only have
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* to define methods for events you care about.) You must provide an
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* implementation for at least <code>drop(DropTargetDropEvent)</code>. This
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* method cannot have a null implementation because its specification requires
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* that you either accept or reject the drop, and, if accepted, indicate
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* whether the drop was successful.
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* <p>
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* Create a listener object using the extended class and then register it with
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* a <code>DropTarget</code>. When the drag enters, moves over, or exits
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* the operable part of the drop site for that <code>DropTarget</code>, when
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* the drop action changes, and when the drop occurs, the relevant method in
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* the listener object is invoked, and the <code>DropTargetEvent</code> is
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* passed to it.
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* <p>
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* The operable part of the drop site for the <code>DropTarget</code> is
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* the part of the associated <code>Component</code>'s geometry that is not
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* obscured by an overlapping top-level window or by another
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* <code>Component</code> higher in the Z-order that has an associated active
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* <code>DropTarget</code>.
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* <p>
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* During the drag, the data associated with the current drag operation can be
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* retrieved by calling <code>getTransferable()</code> on
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* <code>DropTargetDragEvent</code> instances passed to the listener's
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* methods.
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* <p>
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* Note that <code>getTransferable()</code> on the
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* <code>DropTargetDragEvent</code> instance should only be called within the
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* respective listener's method and all the necessary data should be retrieved
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* from the returned <code>Transferable</code> before that method returns.
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*
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* @see DropTargetEvent
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* @see DropTargetListener
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*
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* @author David Mendenhall
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* @since 1.4
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*/
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public abstract class DropTargetAdapter implements DropTargetListener {
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/**
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* Called while a drag operation is ongoing, when the mouse pointer enters
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* the operable part of the drop site for the <code>DropTarget</code>
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* registered with this listener.
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*
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* @param dtde the <code>DropTargetDragEvent</code>
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*/
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public void dragEnter(DropTargetDragEvent dtde) {}
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/**
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* Called when a drag operation is ongoing, while the mouse pointer is still
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* over the operable part of the drop site for the <code>DropTarget</code>
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* registered with this listener.
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*
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* @param dtde the <code>DropTargetDragEvent</code>
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*/
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public void dragOver(DropTargetDragEvent dtde) {}
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/**
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* Called if the user has modified
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* the current drop gesture.
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*
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* @param dtde the <code>DropTargetDragEvent</code>
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*/
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public void dropActionChanged(DropTargetDragEvent dtde) {}
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/**
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* Called while a drag operation is ongoing, when the mouse pointer has
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* exited the operable part of the drop site for the
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* <code>DropTarget</code> registered with this listener.
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*
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* @param dte the <code>DropTargetEvent</code>
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*/
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public void dragExit(DropTargetEvent dte) {}
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}
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