- java.lang.Object
-
- java.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 theDropTargetListener
interface, you have to define all of the methods in it. This abstract class defines a null implementation for every method exceptdrop(DropTargetDropEvent)
, so you only have to define methods for events you care about.) You must provide an implementation for at leastdrop(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 thatDropTarget
, when the drop action changes, and when the drop occurs, the relevant method in the listener object is invoked, and theDropTargetEvent
is passed to it.The operable part of the drop site for the
DropTarget
is the part of the associatedComponent
's geometry that is not obscured by an overlapping top-level window or by anotherComponent
higher in the Z-order that has an associated activeDropTarget
.During the drag, the data associated with the current drag operation can be retrieved by calling
getTransferable()
onDropTargetDragEvent
instances passed to the listener's methods.Note that
getTransferable()
on theDropTargetDragEvent
instance should only be called within the respective listener's method and all the necessary data should be retrieved from the returnedTransferable
before that method returns.- Since:
- 1.4
- See Also:
DropTargetEvent
,DropTargetListener
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Constructor Summary
Constructors Constructor and Description DropTargetAdapter()
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Method Summary
Methods Modifier and Type Method and Description void
dragEnter(DropTargetDragEvent dtde)
Called while a drag operation is ongoing, when the mouse pointer enters the operable part of the drop site for theDropTarget
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 theDropTarget
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 theDropTarget
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
-
-
-
-
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 theDropTarget
registered with this listener.- Specified by:
dragEnter
in interfaceDropTargetListener
- Parameters:
dtde
- theDropTargetDragEvent
-
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 theDropTarget
registered with this listener.- Specified by:
dragOver
in interfaceDropTargetListener
- Parameters:
dtde
- theDropTargetDragEvent
-
dropActionChanged
public void dropActionChanged(DropTargetDragEvent dtde)
Called if the user has modified the current drop gesture.- Specified by:
dropActionChanged
in interfaceDropTargetListener
- Parameters:
dtde
- theDropTargetDragEvent
-
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 theDropTarget
registered with this listener.- Specified by:
dragExit
in interfaceDropTargetListener
- Parameters:
dte
- theDropTargetEvent
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