DragHandle.DragHandleCallback (vaadin-all 8.28.0 API)

Enclosing class:

DragHandle
```
public static interface DragHandle.DragHandleCallback
```
Callback interface for the DragHandle event life cycle.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`void`	`onCancel()`	Called when the drag operation has been cancelled (usually by pressing ESC).
`void`	`onComplete()`	Called when the drag operation completes successfully.
`void`	`onStart()`	Called when dragging starts.
`void`	`onUpdate(double deltaX, double deltaY)`	Called when the drag handle has moved.

- Method Detail
  - onStart
```
void onStart()
```
    Called when dragging starts.
  - onUpdate
```
void onUpdate(double deltaX,
              double deltaY)
```
    Called when the drag handle has moved.
    
    Parameters:
    
    deltaX - change in X direction since start
    
    deltaY - change in Y direction since start
  - onCancel
```
void onCancel()
```
    Called when the drag operation has been cancelled (usually by pressing ESC).
  - onComplete
```
void onComplete()
```
    Called when the drag operation completes successfully.