Examples of org.eclipse.swt.dnd.DragSource.addDragListener()

org.eclipse.swt.dnd.DragSource.addDragListener()
Adds the listener to the collection of listeners who will be notified when a drag and drop operation is in progress, by sending it one of the messages defined in the DragSourceListener interface.
- dragStart is called when 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.
- dragSetData is called when the data is required from the drag source.
- dragFinished is called when 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.
@param listener the listener which should be notified @exception IllegalArgumentException
- ERROR_NULL_ARGUMENT - if the listener is null
@exception SWTException
- ERROR_WIDGET_DISPOSED - if the receiver has been disposed
- ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
@see DragSourceListener @see #getDragListeners @see #removeDragListener @see DragSourceEvent


    DragSource source = new DragSource(viewer.getTree(), DND.DROP_COPY);


    source.setTransfer(new Transfer[] { FeatureStructureTransfer.getInstance() });


    source.addDragListener(new DragSourceListener() {
      TreeItem dragSourceItem = null;


      public void dragStart(DragSourceEvent event) {


        event.doit = false;

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        (ProjectionViewer) this.getSourceViewer(), SelectionCursorListener);
    IDragAndDropService dtSvc = (IDragAndDropService) getSite().getService(IDragAndDropService.class);
    dtSvc.addMergedDropTarget(tw, operations, transfers, ddListener);
    final DragSource source= new DragSource(tw, DND.DROP_COPY | DND.DROP_MOVE);
    source.setTransfer(new Transfer[] {TextTransfer.getInstance()});
    source.addDragListener(ddListener);      
  }
  
  /**
   * sets up seleciton listeners, like the TextSelection listener, and DND (eventually)
   *

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      }


    });
    final DragSource dragSource = new DragSource(gallery, DND.DROP_COPY);
    dragSource.setTransfer(new Transfer[] { FileTransfer.getInstance() });
    dragSource.addDragListener(new DragSourceListener() {


      private String[] dataX;


      public void dragFinished(DragSourceEvent event) {
        this.dataX = null;

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  public void addDragSupport(int operations, Transfer[] transferTypes, DragSourceListener listener) {


    Control myControl = getControl();
    final DragSource dragSource = new DragSource(myControl, operations);
    dragSource.setTransfer(transferTypes);
    dragSource.addDragListener(listener);
  }


  /**
   * Adds support for dropping items into this viewer via a user drag-and-drop
   * operation.

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