defaultSeatLabel static method
Default column letters: A, B, C, D, E, F, G, H...
Implementation
static String defaultSeatLabel(int row, int col, int deckIndex) {
const letters = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ';
final letter = col < letters.length ? letters[col] : '${col + 1}';
final prefix = deckIndex > 0 ? 'U' : '';
return '$prefix${row + 1}$letter';
}