Package com.vaadin.flow.component.dnd

Class DragEndEvent<T extends Component>

java.lang.Object

java.util.EventObject

com.vaadin.flow.component.ComponentEvent<T>

com.vaadin.flow.component.dnd.DragEndEvent<T>

Type Parameters:

T - Type of the component that was dragged.

All Implemented Interfaces:

Serializable

@DomEvent("dragend")
public class DragEndEvent<T extends Component>
extends ComponentEvent<T>

HTML5 drag end event, fired when the user stops dragging a drag source either by dropping on top of a valid drop target or by canceling to drop.

Since:

2.0

Author:

Vaadin Ltd

See Also:

• DragSource.addDragEndListener(com.vaadin.flow.component.ComponentEventListener)
• Serialized Form

Field Summary

Fields inherited from class java.util.EventObject

source

Constructor Summary

Constructors

Constructor	Description
DragEndEvent(T source, boolean fromClient, String dropEffect)	Creates a drag end event.

Method Summary

Modifier and Type	Method	Description
void	clearDragData()	Clears the drag data for this drag operation (and the drag source component).
T	getComponent()	Returns the drag source component where the dragend event occurred.
DropEffect	getDropEffect()	Get drop effect of the dragend event.
boolean	isSuccessful()	Returns whether the drop event succesful or was it cancelled or didn't succeed.

Methods inherited from class com.vaadin.flow.component.ComponentEvent

getSource, isFromClient, unregisterListener

Methods inherited from class java.util.EventObject

toString

Methods inherited from class java.lang.Object

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

Constructor Details

DragEndEvent

public DragEndEvent(T source,
 boolean fromClient,
 @EventData("event.dataTransfer.dropEffect")
 String dropEffect)

Creates a drag end event.

Parameters:

source - Component that was dragged.

fromClient - true if the event originated from the client side, false otherwise

dropEffect - Drop effect from DataTransfer.dropEffect object.

Method Details

getDropEffect

public DropEffect getDropEffect()

Get drop effect of the dragend event. The value will be in priority order: the desired action set by the drop target, effectAllowed parameter of the drag source and modifier keys the user presses. NOTE: there are some browser specific differences to this - Chrome does not change the drop effect based on modifier keys but only what the drop target sets.

If the drop is not successful, the value will be NONE.

In case the desired drop effect is MOVE, the data being dragged should be removed from the source.

Returns:

The DataTransfer.dropEffect parameter of the client side dragend event.

See Also:

• DragSource.setEffectAllowed(EffectAllowed)
• DropTarget.setDropEffect(DropEffect)

isSuccessful

public boolean isSuccessful()

Returns whether the drop event succesful or was it cancelled or didn't succeed. This is a shorthand for dropEffect != NONE. NOTE: For Edge, Safari and IE11 this method will always report false due to bugs in the browsers!

Returns:

true if the drop event succeeded, false otherwise.

Since:

2.1

getComponent

public T getComponent()

Returns the drag source component where the dragend event occurred.

Returns:

Component which was dragged.

clearDragData

public void clearDragData()

Clears the drag data for this drag operation (and the drag source component).

This method is a shorthand for calling DragSource.setDragData(Object) with null parameter.

See Also:

• DragStartEvent.setDragData(Object)
• DragSource.setDragData(Object)