com.allen_sauer.gwt.dnd.demo.client.example.puzzle

Class SetWidgetDropController

java.lang.Object

com.allen_sauer.gwt.dnd.client.drop.AbstractDropController

com.allen_sauer.gwt.dnd.client.drop.SimpleDropController

com.allen_sauer.gwt.dnd.demo.client.example.puzzle.SetWidgetDropController

All Implemented Interfaces:

DropController

public class SetWidgetDropController
extends SimpleDropController

DropController which allows a widget to be dropped on a SimplePanel drop target when the drop target does not yet have a child widget.

Constructor Summary

Constructors

Constructor and Description
SetWidgetDropController(com.google.gwt.user.client.ui.SimplePanel dropTarget)

Method Summary

Methods

Modifier and Type	Method and Description
void	onDrop(DragContext context) Called when the draggable widget or its proxy is dropped on our drop target.
void	onPreviewDrop(DragContext context) Called just prior to DropController.onDrop(DragContext) to allow the drop operation to be cancelled by throwing a VetoDragException.

Methods inherited from class com.allen_sauer.gwt.dnd.client.drop.AbstractDropController

getDropTarget, onEnter, onLeave, onMove

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

SetWidgetDropController

public SetWidgetDropController(com.google.gwt.user.client.ui.SimplePanel dropTarget)

Method Detail

onDrop

public void onDrop(DragContext context)

Description copied from interface: DropController

Called when the draggable widget or its proxy is dropped on our drop target. Implementing classes must attach the draggable widget to our drop target in a suitable manner.

Specified by:

onDrop in interface DropController

Overrides:

onDrop in class AbstractDropController

Parameters:

context - the current drag context

See Also:

DropController.onPreviewDrop(DragContext)

onPreviewDrop

public void onPreviewDrop(DragContext context)
                   throws VetoDragException

Description copied from interface: DropController

Called just prior to DropController.onDrop(DragContext) to allow the drop operation to be cancelled by throwing a VetoDragException.

Specified by:

onPreviewDrop in interface DropController

Overrides:

onPreviewDrop in class AbstractDropController

Parameters:

context - the current drag context

Throws:

VetoDragException - if the proposed operation is unacceptable