JavaTM 2 Platform
Std. Ed. v1.4.2

java.awt.dnd
Class DropTargetAdapter

java.lang.Object
  extended byjava.awt.dnd.DropTargetAdapter
All Implemented Interfaces:
DropTargetListener, EventListener

public abstract class DropTargetAdapter
extends Object
implements DropTargetListener

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.

Extend this class to create a DropTargetEvent listener and override the methods for the events of interest. (If you implement the DropTargetListener interface, you have to define all of the methods in it. This abstract class defines a null implementation for every method except drop(DropTargetDropEvent), so you only have to define methods for events you care about.) You must provide an implementation for at least drop(DropTargetDropEvent). 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.

Create a listener object using the extended class and then register it with a DropTarget. When the drag enters, moves over, or exits the operable part of the drop site for that DropTarget, when the drop action changes, and when the drop occurs, the relevant method in the listener object is invoked, and the DropTargetEvent is passed to it.

The operable part of the drop site for the DropTarget is the part of the associated Component's geometry that is not obscured by an overlapping top-level window or by another Component higher in the Z-order that has an associated active DropTarget.

Since:
1.4
See Also:
DropTargetEvent, DropTargetListener

Constructor Summary
DropTargetAdapter()
           
 
Method Summary
 void dragEnter(DropTargetDragEvent dtde)
          Called while a drag operation is ongoing, when the mouse pointer enters the operable part of the drop site for the DropTarget registered with this listener.
 void dragExit(DropTargetEvent dte)
          Called while a drag operation is ongoing, when the mouse pointer has exited the operable part of the drop site for the DropTarget registered with this listener.
 void dragOver(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 DropTarget registered with this listener.
 void dropActionChanged(DropTargetDragEvent dtde)
          Called if the user has modified the current drop gesture.
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 
Methods inherited from interface java.awt.dnd.DropTargetListener
drop
 

Constructor Detail

DropTargetAdapter

public DropTargetAdapter()
Method Detail

dragEnter

public void dragEnter(DropTargetDragEvent dtde)
Called while a drag operation is ongoing, when the mouse pointer enters the operable part of the drop site for the DropTarget registered with this listener.

Specified by:
dragEnter in interface DropTargetListener
Parameters:
dtde - the DropTargetDragEvent

dragOver

public void dragOver(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 DropTarget registered with this listener.

Specified by:
dragOver in interface DropTargetListener
Parameters:
dtde - the DropTargetDragEvent

dropActionChanged

public void dropActionChanged(DropTargetDragEvent dtde)
Called if the user has modified the current drop gesture.

Specified by:
dropActionChanged in interface DropTargetListener
Parameters:
dtde - the DropTargetDragEvent

dragExit

public void dragExit(DropTargetEvent dte)
Called while a drag operation is ongoing, when the mouse pointer has exited the operable part of the drop site for the DropTarget registered with this listener.

Specified by:
dragExit in interface DropTargetListener
Parameters:
dte - the DropTargetEvent

JavaTM 2 Platform
Std. Ed. v1.4.2

Submit a bug or feature
For further API reference and developer documentation, see Java 2 SDK SE Developer Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.

Copyright 2003 Sun Microsystems, Inc. All rights reserved. Use is subject to license terms. Also see the documentation redistribution policy.


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