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

  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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    Transfer[] types = new Transfer[] { FeatureStructureTransfer.getInstance() };


    dragSource.setTransfer(types);


    dragSource.addDragListener(new FeatureStructureDragListener(getSourceViewer().getTextWidget()));


    getSite().getPage().addSelectionListener(this);


    getSourceViewer().getTextWidget().setEditable(false);
    getSourceViewer().setEditable(false);

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


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


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


      public void dragStart(DragSourceEvent event) {
        TreeItem[] selection = mTableViewer.getTree().getSelection();

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


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


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


      public void dragStart(DragSourceEvent event) {
        TreeItem[] selection = mTableViewer.getTree().getSelection();

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    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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    Transfer[] types = new Transfer[] { FeatureStructureTransfer.getInstance() };


    dragSource.setTransfer(types);


    dragSource.addDragListener(new FeatureStructureDragListener(getSourceViewer().getTextWidget()));


    getSourceViewer().getTextWidget().setEditable(false);
    getSourceViewer().setEditable(false);


    getSite().setSelectionProvider(mFeatureStructureSelectionProvider);

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      DragSource dragSource=new DragSource(control, dndOperations);
        DragController dragController = new DragController(dragSource, transfers);
        provider.addSelectionChangedListener(dragController);
        dragController.setTransfers((IStructuredSelection) provider.getSelection());
      UDIGControlDragListener controlDragListener = new UDIGControlDragListener(provider);
        dragSource.addDragListener(controlDragListener);
        return new DragSourceDescriptor(dragSource, controlDragListener);
  }
  /**
   * Adds drop support to the StructuredViewer.
   * <p>For this to work the destination object must have a dropAction extension

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  private void setupDataManagerViewForDragAndDropOutOf(Composite parent) {
    Transfer[] types = new Transfer[] { new CIShellDataTransfer(Activator.context) };
    DragSource dragSource = new DragSource(parent, DND.DROP_DEFAULT | DND.DROP_MOVE);
    dragSource.setTransfer(types);
    dragSource.addDragListener(new DragSourceListener() {
      private Data[] selectedData;


      public void dragStart(DragSourceEvent event) {
        System.err.println("dragStart");
        Data[] selectedData = AbstractDataManagerView.this.manager.getSelectedData();

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    Transfer[] types = new Transfer[] { new JComponentTransfer() };
    int operations = DND.DROP_MOVE | DND.DROP_COPY | DND.DROP_LINK;
    final DragSource source = new DragSource(tree, operations);
    source.setTransfer(types);
    treeItems = new TreeItem[1];
    source.addDragListener(this);


    DropTarget target = new DropTarget(tree, operations);
    target.setDropTargetEffect(new MyDropTargetEffect(tree));
    target.setTransfer(types);
    target.addDropListener(this);

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