nextRow method
void
nextRow()
Moves to the next row of the table.
Implementation
void nextRow() {
if (_index != -1 && (buttons.elementAtOrNull(_index)?.isEmpty ?? false)) {
throw VkDartKeyboardException(
'To move to the next line, fill in the previous one by the index $_index');
}
_index += 1;
buttons.add([]);
}