Custom Tousands Formatter

custom_tousands_formatter.dart

import 'package:flutter/services.dart';
import 'package:intl/intl.dart';
import 'package:pattern_formatter/pattern_formatter.dart';

/*
Hello #flutter #developers, I used pattern_formatter package 
 to format prices written in TextFormField. 
When user types 0,0 then value formatted to 0 immediately. 
For fix this issue I wrote CustomThousandsFormatter.
*/

class CustomThousandsFormatter extends ThousandsFormatter {
  CustomThousandsFormatter(
      {NumberFormat? formatter, bool allowFraction = false})
      : super(formatter: formatter, allowFraction: allowFraction);

  @override
  TextEditingValue formatEditUpdate(
      TextEditingValue oldValue, TextEditingValue newValue) {
    // dont thouch these inputs
    final _skipValues = [
      '0${numberFormat.symbols.DECIMAL_SEP}0', // 0,0
      '0${numberFormat.symbols.DECIMAL_SEP}00', // 0,00
      '0${numberFormat.symbols.DECIMAL_SEP}000', // 0,000
      '0${numberFormat.symbols.DECIMAL_SEP}0000', // 0,0000
    ];

    if (_skipValues.contains(newValue.text)) {
      return newValue;
    }
    return super.formatEditUpdate(oldValue, newValue);
  }
}

final numberFormat = NumberFormat.decimalPattern('tr_TR');

final customThousandsFormatter =
    CustomThousandsFormatter(formatter: numberFormat, allowFraction: true);