Flutter custom price input formatter for standard TextField

MinMaxPriceTextInputFormatter.dart

import 'package:flutter/services.dart';

class MaxPriceTextInputFormatter extends TextInputFormatter {
  MaxPriceTextInputFormatter({this.maxPrice})
      : assert(maxPrice == null || maxPrice > 0);

  final double maxPrice;

  @override
  TextEditingValue formatEditUpdate(
    TextEditingValue oldValue,
    TextEditingValue newValue,
  ) {
    if (newValue.text.isEmpty || maxPrice == null) {
      return newValue;
    }

    String value = newValue.text.replaceAll(",", ".");

    try {
      final priceValue =
          double.parse(value.endsWith(".") ? "${value}0" : value);
      if (priceValue <= maxPrice) {
        String finalString = value;
        if (finalString.contains(".")) {
          final List<String> components = value.split(".").toList();
          if (components.length > 1 && components.last.length > 2) {
            components.last = components.last.substring(0, 2);
          }
          finalString = "${components.first}.${components.last}";
        }
        return TextEditingValue(
          text: finalString,
          selection: newValue.selection,
          composing: newValue.composing,
        );
      } else {
        return TextEditingValue(
          text: "${maxPrice.toInt()}",
          selection: newValue.selection,
          composing: newValue.composing,
        );
      }
    } catch (ex) {
      print(ex.toString());
      return oldValue;
    }
  }
}