mxGraphHandler.java 文件源码

/**
 * 
 */
protected void installDragGestureHandler() {
  DragGestureListener dragGestureListener = new DragGestureListener() {
    public void dragGestureRecognized(DragGestureEvent e) {
      if (graphComponent.isDragEnabled() && first != null) {
        final TransferHandler th = graphComponent.getTransferHandler();

        if (th instanceof mxGraphTransferHandler) {
          final mxGraphTransferable t = (mxGraphTransferable) ((mxGraphTransferHandler) th)
              .createTransferable(graphComponent);

          if (t != null) {
            e.startDrag(null, mxSwingConstants.EMPTY_IMAGE, new Point(), t,
                new DragSourceAdapter() {

                  /**
                   * 
                   */
                  public void dragDropEnd(DragSourceDropEvent dsde) {
                    ((mxGraphTransferHandler) th).exportDone(graphComponent, t,
                        TransferHandler.NONE);
                    first = null;
                  }
                });
          }
        }
      }
    }
  };

  DragSource dragSource = new DragSource();
  dragSource.createDefaultDragGestureRecognizer(graphComponent.getGraphControl(),
      (isCloneEnabled()) ? DnDConstants.ACTION_COPY_OR_MOVE : DnDConstants.ACTION_MOVE,
      dragGestureListener);
}