Class DropTargetAdapter
- All Implemented Interfaces:
DropTargetListener,EventListener
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.
During the drag, the data associated with the current drag operation can be
retrieved by calling getTransferable() on
DropTargetDragEvent instances passed to the listener's
methods.
Note that getTransferable() on the
DropTargetDragEvent instance should only be called within the
respective listener's method and all the necessary data should be retrieved
from the returned Transferable before that method returns.
- Since:
- 1.4
- See Also:
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Constructor Summary
Constructors -
Method Summary
Modifier and TypeMethodDescriptionvoiddragEnter(DropTargetDragEvent dtde) Called while a drag operation is ongoing, when the mouse pointer enters the operable part of the drop site for theDropTargetregistered with this listener.voiddragExit(DropTargetEvent dte) Called while a drag operation is ongoing, when the mouse pointer has exited the operable part of the drop site for theDropTargetregistered with this listener.voiddragOver(DropTargetDragEvent dtde) Called when a drag operation is ongoing, while the mouse pointer is still over the operable part of the drop site for theDropTargetregistered with this listener.voidCalled if the user has modified the current drop gesture.Methods declared in class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, waitMethods declared in interface java.awt.dnd.DropTargetListener
drop
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Constructor Details
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DropTargetAdapter
protected DropTargetAdapter()Constructs aDropTargetAdapter.
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Method Details
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dragEnter
Called while a drag operation is ongoing, when the mouse pointer enters the operable part of the drop site for theDropTargetregistered with this listener.- Specified by:
dragEnterin interfaceDropTargetListener- Parameters:
dtde- theDropTargetDragEvent
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dragOver
Called when a drag operation is ongoing, while the mouse pointer is still over the operable part of the drop site for theDropTargetregistered with this listener.- Specified by:
dragOverin interfaceDropTargetListener- Parameters:
dtde- theDropTargetDragEvent
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dropActionChanged
Called if the user has modified the current drop gesture.- Specified by:
dropActionChangedin interfaceDropTargetListener- Parameters:
dtde- theDropTargetDragEvent
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dragExit
Called while a drag operation is ongoing, when the mouse pointer has exited the operable part of the drop site for theDropTargetregistered with this listener.- Specified by:
dragExitin interfaceDropTargetListener- Parameters:
dte- theDropTargetEvent
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