backspace method
void
backspace()
Implementation
void backspace() {
if (hasBreak) {
_replaceFinalCharacter('');
} else if (_text.isNotEmpty) {
final String currentFinalCharacter = _text.substring(_text.length - 1);
if (isHangulSyllable(currentFinalCharacter)) {
final currentSyllable =
HangulSyllable.fromString(currentFinalCharacter);
if (currentSyllable.jong != null) {
if (_jongCombinations.containsValue(currentSyllable.jong)) {
final combination = _jongCombinations.keys.firstWhere(
(k) => _jongCombinations[k] == currentSyllable.jong);
currentSyllable.jong = combination[0];
} else {
currentSyllable.jong = null;
}
_replaceFinalCharacter(currentSyllable.toString());
} else {
_replaceFinalCharacter(currentSyllable.cho);
}
} else {
_replaceFinalCharacter('');
}
}
}