org.eclipse.swt.dnd

Interface DragSourceListener

All Known Implementing Classes:

DragSourceAdapter, DragSourceEffect

public interface DragSourceListener

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.

Since:

1.3

Method Summary

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