import java.awt.datatransfer.Transferable;
import java.awt.datatransfer.DataFlavor;
import java.awt.datatransfer.UnsupportedFlavorException;

sclass FileTransferable implements Transferable {
  new L<File> files;

  *(File  f) { files.add(f); }
  *(L<File> *files) {}

  public DataFlavor[] getTransferDataFlavors() {
    ret new DataFlavor[] { DataFlavor.javaFileListFlavor };
  }

  public bool isDataFlavorSupported(DataFlavor flavor) {
    ret eq(flavor, DataFlavor.javaFileListFlavor);
  }

  public O getTransferData(DataFlavor flavor) {
    ret files;
  }
}

Began life as a copy of #1006061