Examples of org.eclipse.swt.dnd.DropTarget.addDropListener()

org.eclipse.swt.dnd.DropTarget.addDropListener()
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 DropTargetListener interface.
- dragEnter is called when the cursor has entered the drop target boundaries
- dragLeave is called when the cursor has left the drop target boundaries and just before the drop occurs or is cancelled.
- dragOperationChanged is called when the operation being performed has changed (usually due to the user changing the selected modifier key(s) while dragging)
- dragOver is called when the cursor is moving over the drop target
- dropAccept is called just before the drop is performed. The drop target is given the chance to change the nature of the drop or veto the drop by setting the event.detail field
- drop is called when the data is being dropped
@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 DropTargetListener @see #getDropListeners @see #removeDropListener @see DropTargetEvent

   * @return the DropTarget for the table
   */
  private DropTarget createTableDropTarget(final Table table) {
    DropTarget dropTarget = new DropTarget(table, DND.DROP_MOVE | DND.DROP_COPY);
    dropTarget.setTransfer(new Transfer[] { FileTransfer.getInstance() });
    dropTarget.addDropListener(new DropTargetAdapter() {
      public void dragEnter(DropTargetEvent event) {
        isDropping = true;
      }


      public void dragLeave(DropTargetEvent event) {

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   * @return the DropTarget for the tree
   */
  private DropTarget createTreeDropTarget(final Tree tree) {
    DropTarget dropTarget = new DropTarget(tree, DND.DROP_MOVE | DND.DROP_COPY);
    dropTarget.setTransfer(new Transfer[] { FileTransfer.getInstance() });
    dropTarget.addDropListener(new DropTargetAdapter() {
      public void dragEnter(DropTargetEvent event) {
        isDropping = true;
      }


      public void dragLeave(DropTargetEvent event) {

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        int operations = DND.DROP_COPY | DND.DROP_DEFAULT;
        DropTarget target = new DropTarget(field, operations);
        final TextTransfer textTransfer = TextTransfer.getInstance();
        Transfer[] types = new Transfer[] { textTransfer };
        target.setTransfer(types);
        target.addDropListener(new DropTargetListener() {
            public void dragEnter(DropTargetEvent event) {
                if (event.detail == DND.DROP_DEFAULT) {
                    if ((event.operations & DND.DROP_COPY) != 0) {
                        event.detail = DND.DROP_COPY;
                    } else {

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        // Receive data in Text or File format
        final FileTransfer fileTransfer = FileTransfer.getInstance();
        Transfer[] types = new Transfer[] { fileTransfer };
        target.setTransfer(types);


        target.addDropListener(new DropTargetListener() {
            public void dragEnter(DropTargetEvent event) {
                if (event.detail == DND.DROP_DEFAULT) {
                    if ((event.operations & DND.DROP_COPY) != 0) {
                        event.detail = DND.DROP_COPY;
                    } else {

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            dragSource.setTransfer(new Transfer[] { org.eclipse.swt.dnd.TextTransfer.getInstance() });


            DropTarget dropTarget = new DropTarget(this, DND.DROP_COPY | DND.DROP_MOVE);
            dropTarget.setTransfer(new Transfer[] { LocalSelectionTransfer.getTransfer(),
                    org.eclipse.swt.dnd.TextTransfer.getInstance() });
            dropTarget.addDropListener(new DragTargetAdapter());
        }


        private final class DragSourceAdapter implements DragSourceListener {
            private Point selection;
            private String selectionText = null;

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  public void addDropSupport(int operations, Transfer[] transferTypes,
      DropTargetListener listener) {
    final DropTarget target = new DropTarget(this, operations);
    target.setTransfer(transferTypes);
    target.addDropListener(listener);
  }
}

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        );
        
        final DropTarget target = new DropTarget( tree, DND.DROP_COPY | DND.DROP_MOVE );
        target.setTransfer( transfers );
        
        target.addDropListener
        (
            new DropTargetAdapter()
            {
                public void dragOver( final DropTargetEvent event )
                {

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        public void addDropSupport(int operations, Transfer[] transferTypes, final DropTargetListener listener)
        {
            DropTarget dropTarget = new DropTarget(item, operations);
            dropTarget.setTransfer(transferTypes);
            dropTarget.addDropListener(new DropTargetListener()
            {
                @Override
                public void dropAccept(DropTargetEvent event)
                {
                    listener.dropAccept(event);

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  public void addDropSupport(int operations, Transfer[] transferTypes,
      final DropTargetListener listener) {
    Control control = getControl();
    DropTarget dropTarget = new DropTarget(control, operations);
    dropTarget.setTransfer(transferTypes);
    dropTarget.addDropListener(listener);
  }


  /**
   * Adds the given filter to this viewer, and triggers refiltering and
   * resorting of the elements. If you want to add more than one filter

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        DropTarget target = new DropTarget( viewer.getControl(), operations );
        //we only support file dropping on the viewer
        Transfer[] types = new Transfer[]
            { FileTransfer.getInstance() };
        target.setTransfer( types );
        target.addDropListener( PoolManagerController.getInstance() );
    }




    /* (non-Javadoc)
     * @see org.eclipse.ui.part.WorkbenchPart#setFocus()

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