@Override
	public Transferable getTransferable(Point p) {
		int row = table.rowAtPoint(p);
		if (row >= 0) {
			Version version = tableModel.getVersionAt(row);
			return new VersionInfoTransferable(domainFile.getPathname(), version.getVersion());
		}
		return null;
	}
Get the selected version number or {@link DomainFile#DEFAULT_VERSION} if no selection.
@return selected version number
Ghidra/Framework/Project/src/main/java/ghidra/framework/main/datatree/VersionHistoryPanel.java