DragSourceListener
, DragSourceMotionListener
, EventListener
public abstract class DragSourceAdapter extends Object implements DragSourceListener, DragSourceMotionListener
Extend this class to create a DragSourceEvent
listener and override the methods for the events of interest. (If you implement the DragSourceListener
interface, you have to define all of the methods in it. This abstract class defines null methods for them all, so you only have to define methods for events you care about.)
Create a listener object using the extended class and then register it with a DragSource
. When the drag enters, moves over, or exits a drop site, when the drop action changes, and when the drag ends, the relevant method in the listener object is invoked, and the DragSourceEvent
is passed to it.
The drop site is associated with the previous dragEnter()
invocation if the latest invocation of dragEnter()
on this adapter corresponds to that drop site and is not followed by a dragExit()
invocation on this adapter.
Modifier | Constructor | Description |
---|---|---|
protected |
Constructs a DragSourceAdapter . |
Modifier and Type | Method | Description |
---|---|---|
void |
dragDropEnd |
This method is invoked to signify that the Drag and Drop operation is complete. |
void |
dragEnter |
Called as the cursor's hotspot enters a platform-dependent drop site. |
void |
dragExit |
Called as the cursor's hotspot exits a platform-dependent drop site. |
void |
dragMouseMoved |
Called whenever the mouse is moved during a drag operation. |
void |
dragOver |
Called as the cursor's hotspot moves over a platform-dependent drop site. |
void |
dropActionChanged |
Called when the user has modified the drop gesture. |
protected DragSourceAdapter()
DragSourceAdapter
.public void dragEnter(DragSourceDragEvent dsde)
dragEnter
in interface DragSourceListener
dsde
- the DragSourceDragEvent
public void dragOver(DragSourceDragEvent dsde)
dragOver
in interface DragSourceListener
dsde
- the DragSourceDragEvent
public void dragMouseMoved(DragSourceDragEvent dsde)
dragMouseMoved
in interface DragSourceMotionListener
dsde
- the DragSourceDragEvent
public void dropActionChanged(DragSourceDragEvent dsde)
dropActionChanged
in interface DragSourceListener
dsde
- the DragSourceDragEvent
public void dragExit(DragSourceEvent dse)
dragExit
in interface DragSourceListener
dse
- the DragSourceEvent
public void dragDropEnd(DragSourceDropEvent dsde)
DragSourceDropEvent
can be used to determine the termination state. The getDropAction() method returns the operation that the drop site selected to apply to the Drop operation. Once this method is complete, the current DragSourceContext
and associated resources become invalid.dragDropEnd
in interface DragSourceListener
dsde
- the DragSourceDropEvent
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Documentation extracted from Debian's OpenJDK Development Kit package.
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https://docs.oracle.com/en/java/javase/21/docs/api/java.desktop/java/awt/dnd/DragSourceAdapter.html