public abstract class AbstractDropController extends java.lang.Object implements DropController
Constructor and Description |
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AbstractDropController(com.google.gwt.user.client.ui.Widget dropTarget) |
Modifier and Type | Method and Description |
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com.google.gwt.user.client.ui.Widget |
getDropTarget()
Retrieve our drop target widget.
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void |
onDrop(DragContext context)
Called when the draggable widget or its proxy is dropped on our drop target.
|
void |
onEnter(DragContext context)
Called when the draggable widget or its proxy engages our drop target.
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void |
onLeave(DragContext context)
Called when the reference widget stops engaging our drop target by leaving the area of the page
occupied by our drop target, or after
DropController.onDrop(DragContext) to allow for any cleanup. |
void |
onMove(DragContext context)
Called with each mouse movement while the reference widget is engaging our drop target.
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void |
onPreviewDrop(DragContext context)
Called just prior to
DropController.onDrop(DragContext) to allow the drop operation to be cancelled
by throwing a VetoDragException . |
public AbstractDropController(com.google.gwt.user.client.ui.Widget dropTarget)
public com.google.gwt.user.client.ui.Widget getDropTarget()
DropController
getDropTarget
in interface DropController
public void onDrop(DragContext context)
DropController
onDrop
in interface DropController
context
- the current drag contextDropController.onPreviewDrop(DragContext)
public void onEnter(DragContext context)
DropController
onEnter
in interface DropController
context
- the current drag contextDropController.onLeave(DragContext)
public void onLeave(DragContext context)
DropController
DropController.onDrop(DragContext)
to allow for any cleanup.onLeave
in interface DropController
context
- the current drag contextDropController.onEnter(DragContext)
public void onMove(DragContext context)
DropController
DropController.onEnter(DragContext)
is called before this method is called.onMove
in interface DropController
context
- the current drag contextDropController.onEnter(DragContext)
,
DropController.onLeave(DragContext)
public void onPreviewDrop(DragContext context) throws VetoDragException
DropController
DropController.onDrop(DragContext)
to allow the drop operation to be cancelled
by throwing a VetoDragException
.onPreviewDrop
in interface DropController
context
- the current drag contextVetoDragException
- if the proposed operation is unacceptable