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public abstract class DragSourceAdapter extends Object implements DragSourceListener, DragSourceMotionListener
An abstract adapter class for receiving drag source 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 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.
Constructor Summary | |
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Method Summary | |
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void |
This method is invoked to signify that the Drag and Drop operation is complete. |
void |
dragEnter(DragSourceDragEvent dsde) Called as the cursor's hotspot enters a platform-dependent drop site. |
void |
dragExit(DragSourceEvent dse) Called as the cursor's hotspot exits a platform-dependent drop site. |
void |
Called whenever the mouse is moved during a drag operation. |
void |
dragOver(DragSourceDragEvent dsde) Called as the cursor's hotspot moves over a platform-dependent drop site. |
void |
Called when the user has modified the drop gesture. |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
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public DragSourceAdapter()
Method Detail |
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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.
dsde
- the DragSourceDropEvent
public void dragEnter(DragSourceDragEvent dsde)
dsde
- the DragSourceDragEvent
public void dragExit(DragSourceEvent dse)
dse
- the DragSourceEvent
public void dragMouseMoved(DragSourceDragEvent dsde)
dsde
- the DragSourceDragEvent
public void dragOver(DragSourceDragEvent dsde)
dsde
- the DragSourceDragEvent
public void dropActionChanged(DragSourceDragEvent dsde)
dsde
- the DragSourceDragEvent
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