DragSourceListener (SWT 4.6.3 API)

All Superinterfaces:

EventListener, SWTEventListener

All Known Implementing Classes:

DragSourceAdapter, DragSourceEffect, TableDragSourceEffect, TreeDragSourceEffect
```
public interface DragSourceListener
extends SWTEventListener
```
The DragSourceListener class provides event notification to the application for DragSource events.
When the user drops data on a DropTarget, the application which defines the DragSource must provide the dropped data by implementing dragSetData. In the dragSetData, the application must support all the data types that were specified in the DragSource#setTransfer method.

After the drop has completed successfully or has been aborted, the application which defines the DragSource is required to take the appropriate cleanup action. In the case of a successful move operation, the application must remove the data that was transferred.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method and Description
`void`	`dragFinished(DragSourceEvent event)` The drop has successfully completed(mouse up over a valid target) or has been terminated (such as hitting the ESC key).
`void`	`dragSetData(DragSourceEvent event)` The data is required from the drag source.
`void`	`dragStart(DragSourceEvent event)` The user has begun the actions required to drag the widget.

- Method Detail
  - dragStart
```
void dragStart(DragSourceEvent event)
```
    The user has begun the actions required to drag the widget. This event gives the application the chance to decide if a drag should be started.
    The following fields in the DragSourceEvent apply:
    - (in)widget
    - (in)time
    - (in,out)doit
    Parameters:
    
    event - the information associated with the drag start event
    
    See Also:
    
    DragSourceEvent
  - dragSetData
```
void dragSetData(DragSourceEvent event)
```
    The data is required from the drag source.
    The following fields in the DragSourceEvent apply:
    - (in)widget
    - (in)time
    - (in)dataType - the type of data requested.
    - (out)data - the application inserts the actual data here (must match the dataType)
    - (out)doit - set this to cancel the drag
    Parameters:
    
    event - the information associated with the drag set data event
    
    See Also:
    
    DragSourceEvent
  - dragFinished
```
void dragFinished(DragSourceEvent event)
```
    The drop has successfully completed(mouse up over a valid target) or has been terminated (such as hitting the ESC key). Perform cleanup such as removing data from the source side on a successful move operation.
    The following fields in the DragSourceEvent apply:
    - (in)widget
    - (in)time
    - (in)doit
    - (in)detail
    Parameters:
    
    event - the information associated with the drag finished event
    
    See Also:
    
    DragSourceEvent

Interface DragSourceListener

Method Summary

Method Detail

dragStart

dragSetData

dragFinished