DragAndDropHandler (vaadin-all 7.7.44 API)

java.lang.Object
- com.vaadin.client.ui.dd.DragAndDropHandler

```
public class DragAndDropHandler
extends Object
```
A simple event handler for elements that can be drag and dropped. Properly handles drag start, cancel and end. For example, used in Grid column header reordering.
The showing of the dragged element, drag hints and reacting to drop/cancel is delegated to DragAndDropHandler.DragAndDropCallback implementation.

Since:

7.5.0

Author:

Vaadin Ltd

Nested Class Summary

Nested Classes
Modifier and Type Class Description

static interface DragAndDropHandler.DragAndDropCallback
Callback interface for drag and drop.

Constructor Summary

Constructors
Constructor Description

DragAndDropHandler()

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`onDragStartOnDraggableElement(com.google.gwt.dom.client.NativeEvent dragStartingEvent, DragAndDropHandler.DragAndDropCallback callback)`	This method can be called to trigger drag and drop on any grid element that can be dragged and dropped.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - DragAndDropHandler
```
public DragAndDropHandler()
```
- Method Detail
  - onDragStartOnDraggableElement
```
public void onDragStartOnDraggableElement(com.google.gwt.dom.client.NativeEvent dragStartingEvent,
                                          DragAndDropHandler.DragAndDropCallback callback)
```
    This method can be called to trigger drag and drop on any grid element that can be dragged and dropped.
    
    Parameters:
    
    dragStartingEvent - the drag triggering event, usually a Event.ONMOUSEDOWN or Event.ONTOUCHSTART event on the draggable element
    
    callback - the callback that will handle actual drag and drop related operations