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how to make text field max length counter count the Arabic diacritics in flutter

Shy Spider answered on June 19, 2024 Popularity 1/10 Helpfulness 1/10

answer how to make text field max length counter count the Arabic diacritics in flutter

how to make text field max length counter count the Arabic diacritics in flutter

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class _Utf8LengthLimitingTextInputFormatter extends TextInputFormatter {
  _Utf8LengthLimitingTextInputFormatter(this.maxLength)
      : assert(maxLength == null || maxLength == -1 || maxLength > 0);

  final int maxLength;

  @override
  TextEditingValue formatEditUpdate(
      TextEditingValue oldValue,
      TextEditingValue newValue,
      ) {
    if (maxLength != null &&
        maxLength > 0 &&
        bytesLength(newValue.text) > maxLength) {
      // If already at the maximum and tried to enter even more, keep the old value.
      if (bytesLength(oldValue.text) == maxLength) {
        return oldValue;
      }
      return truncate(newValue, maxLength);
    }
    return newValue;
  }

  static TextEditingValue truncate(TextEditingValue value, int maxLength) {
    var newValue = '';
    if (bytesLength(value.text) > maxLength) {
      var length = 0;

      value.text.characters.takeWhile((char) {
        var nbBytes = bytesLength(char);
        if (length + nbBytes <= maxLength) {
          newValue += char;
          length += nbBytes;
          return true;
        }
        return false;
      });
    }
    return TextEditingValue(
      text: newValue,
      selection: value.selection.copyWith(
        baseOffset: min(value.selection.start, newValue.length),
        extentOffset: min(value.selection.end, newValue.length),
      ),
      composing: TextRange.empty,
    );
  }

  static int bytesLength(String value) {
    return utf8.encode(value).length;
  }
}

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Source: dev.to

Tags: arabic count counter diacritics field flutter max text whatever

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Contributed on Jun 19 2024

Shy Spider

0 Answers Avg Quality 2/10

how to make text field max length counter count the Arabic diacritics in flutter

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