Java 类org.eclipse.swt.dnd.DragSourceListener 实例源码

protected void configureDragAndDrop(DragAndDropConfiguration dragAndDropConfiguration, TreeViewer treeViewer) {

      // drop
      Transfer[] transferTypes = new Transfer[] { LocalSelectionTransfer.getTransfer() };
      int operations = dragAndDropConfiguration.getSupportedDropOperations(this);

      DropTarget target = new DropTarget(treeViewer.getControl(), operations);
      target.setTransfer(transferTypes);

      // Drop listeners pour le drop des elements sur l'arbre
      SchemaViewerDropPolicy dropPolicy = dragAndDropConfiguration.getDropPolicy(this);
      DnDTargetListener targetListener = new DnDTargetListener(this, nodeConverter, dropPolicy);
      target.addDropListener(targetListener);

      // Drag listener pour le drag des elements de l'arbre
      DragSourceListener sourceListener = new DnDSourceListener(this);
      operations = DND.DROP_MOVE | DND.DROP_COPY | DND.DROP_DEFAULT;
      transferTypes = new Transfer[] { LocalSelectionTransfer.getTransfer() };
      treeViewer.addDragSupport(operations, transferTypes, sourceListener);

  }

protected DragSourceListener getDragSourceAdapter(
        final TableViewer inViewer) {
    return new DragSourceAdapter() {
        @Override
        public void dragSetData(final DragSourceEvent inEvent) {
            final IStructuredSelection lSelected = (IStructuredSelection) inViewer
                    .getSelection();
            if (!lSelected.isEmpty()) {
                final Object[] lItems = lSelected.toArray();
                final UniqueID[] lIDs = new UniqueID[lItems.length];
                for (int i = 0; i < lItems.length; i++) {
                    final ILightWeightItem lItem = (ILightWeightItem) lItems[i];
                    lIDs[i] = new UniqueID(lItem.getItemType(),
                            lItem.getID());
                }
                inEvent.data = lIDs;
            }
        }
    };
}

@Override
public void addDragSupport(int operations, Transfer[] transferTypes, DragSourceListener listener) {
    fViewer.addDragSupport(operations, transferTypes, listener);
}

@Override
public void addDragSupport(int operations, Transfer[] transferTypes, DragSourceListener listener) {
    fViewer.addDragSupport(operations, transferTypes, listener);
}

/**
 * Adds support for dragging items out of this viewer via a user
 * drag-and-drop operation.
 * 
 * @param operations
 *            a bitwise OR of the supported drag and drop operation types (
 *            <code>DROP_COPY</code>,<code>DROP_LINK</code>, and
 *            <code>DROP_MOVE</code>)
 * @param transferTypes
 *            the transfer types that are supported by the drag operation
 * @param listener
 *            the callback that will be invoked to set the drag data and to
 *            cleanup after the drag and drop operation finishes
 * @see org.eclipse.swt.dnd.DND
 */
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);
}