DragStartListener (vaadin-server 8.28-SNAPSHOT API)

Type Parameters:

T - Type of draggable component.

All Superinterfaces:

ConnectorEventListener, EventListener, Serializable, SerializableEventListener

Functional Interface:

This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.
```
@FunctionalInterface
public interface DragStartListener<T extends AbstractComponent>
extends ConnectorEventListener
```
Interface to be implemented when creating a dragstart listener on a drag source for HTML5 drag and drop.

Since:

8.1

Author:

Vaadin Ltd

See Also:

DragSourceExtension.addDragStartListener(DragStartListener)

- Field Summary
  
  Fields
  Modifier and Type Field Description
  
  static Method DRAGSTART_METHOD
- Method Summary
  
  All Methods Instance Methods Abstract Methods
  Modifier and Type Method Description
  
  void dragStart(DragStartEvent<T> event)
  Called when dragstart event is fired.

- Field Detail
  - DRAGSTART_METHOD
```
static final Method DRAGSTART_METHOD
```
- Method Detail
  - dragStart
```
void dragStart(DragStartEvent<T> event)
```
    Called when dragstart event is fired.
    
    Parameters:
    
    event - Server side dragstart event.