JavaTM 2 Platform Std. Ed. v1.6.0
java.awt.dnd
Class DragSourceAdapter
java.lang.Object
java.awt.dnd.DragSourceAdapter
- All Implemented Interfaces:
- DragSourceListener, DragSourceMotionListener, EventListener
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.
- Since:
- 1.4
- See Also:
DragSourceEvent ,
DragSourceListener ,
DragSourceMotionListener
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
DragSourceAdapter
public DragSourceAdapter()
dragEnter
public void dragEnter(DragSourceDragEvent dsde)
- Called as the cursor's hotspot enters a platform-dependent drop site.
This method is invoked when all the following conditions are true:
- The cursor's hotspot enters the operable part of
a platform-dependent drop site.
- The drop site is active.
- The drop site accepts the drag.
- Specified by:
dragEnter in interface DragSourceListener
- Parameters:
dsde - the DragSourceDragEvent
dragOver
public void dragOver(DragSourceDragEvent dsde)
- Called as the cursor's hotspot moves over a platform-dependent drop site.
This method is invoked when all the following conditions are true:
- The cursor's hotspot has moved, but still intersects the
operable part of the drop site associated with the previous
dragEnter() invocation.
- The drop site is still active.
- The drop site accepts the drag.
- Specified by:
dragOver in interface DragSourceListener
- Parameters:
dsde - the DragSourceDragEvent
dragMouseMoved
public void dragMouseMoved(DragSourceDragEvent dsde)
- Called whenever the mouse is moved during a drag operation.
- Specified by:
dragMouseMoved in interface DragSourceMotionListener
- Parameters:
dsde - the DragSourceDragEvent
dropActionChanged
public void dropActionChanged(DragSourceDragEvent dsde)
- Called when the user has modified the drop gesture.
This method is invoked when the state of the input
device(s) that the user is interacting with changes.
Such devices are typically the mouse buttons or keyboard
modifiers that the user is interacting with.
- Specified by:
dropActionChanged in interface DragSourceListener
- Parameters:
dsde - the DragSourceDragEvent
dragExit
public void dragExit(DragSourceEvent dse)
- Called as the cursor's hotspot exits a platform-dependent drop site.
This method is invoked when any of the following conditions are true:
- The cursor's hotspot no longer intersects the operable part
of the drop site associated with the previous dragEnter() invocation.
OR
- The drop site associated with the previous dragEnter() invocation
is no longer active.
OR
- The drop site associated with the previous dragEnter() invocation
has rejected the drag.
- Specified by:
dragExit in interface DragSourceListener
- Parameters:
dse - the DragSourceEvent
dragDropEnd
public void dragDropEnd(DragSourceDropEvent dsde)
- This method is invoked to signify that the Drag and Drop
operation is complete. The getDropSuccess() method of
the
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.
- Specified by:
dragDropEnd in interface DragSourceListener
- Parameters:
dsde - the DragSourceDropEvent
Copyright 2003 Sun Microsystems, Inc. All rights reserved
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