pattern_formatter 4.0.1

A Flutter package provides some implementations of TextInputFormatter that format input with pre-defined patterns

example/lib/main.dart

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

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(primarySwatch: Colors.blue),
      home: MyHomePage(title: 'Pattern Input'),
    );
  }
}

class MyHomePage extends StatelessWidget {
  final String title;

  const MyHomePage({super.key, required this.title});

  @override
  Widget build(BuildContext context) {
    return GestureDetector(
      onTap: () {
        FocusScope.of(context).requestFocus(FocusNode());
      },
      child: Scaffold(
        appBar: AppBar(title: Text(title)),
        body: SingleChildScrollView(
          child: Column(
            mainAxisSize: MainAxisSize.max,
            children: [
              Padding(
                padding: EdgeInsets.symmetric(horizontal: 16.0, vertical: 24.0),
                child: TextField(
                  decoration: InputDecoration(
                    border: OutlineInputBorder(),
                    isDense: true,
                    labelText: 'Integer Number',
                  ),
                  keyboardType: TextInputType.number,
                  inputFormatters: [
                    LengthLimitingTextInputFormatter(15),
                    ThousandsFormatter(),
                  ],
                  style: TextStyle(fontSize: 16.0, color: Colors.black),
                ),
              ),
              Padding(
                padding: EdgeInsets.symmetric(horizontal: 16.0, vertical: 24.0),
                child: TextField(
                  decoration: InputDecoration(
                    border: OutlineInputBorder(),
                    isDense: true,
                    labelText: 'Decimal Number',
                  ),
                  keyboardType: TextInputType.number,
                  inputFormatters: [
                    LengthLimitingTextInputFormatter(15),
                    ThousandsFormatter(allowFraction: true),
                  ],
                  style: TextStyle(fontSize: 16.0, color: Colors.black),
                ),
              ),
              Padding(
                padding: EdgeInsets.symmetric(horizontal: 16.0, vertical: 24.0),
                child: TextField(
                  decoration: InputDecoration(
                    border: OutlineInputBorder(),
                    isDense: true,
                    labelText: 'Card Number',
                  ),
                  keyboardType: TextInputType.number,
                  inputFormatters: [
                    LengthLimitingTextInputFormatter(19),
                    CreditCardFormatter(),
                  ],
                  style: TextStyle(fontSize: 16.0, color: Colors.black),
                ),
              ),
              Padding(
                padding: EdgeInsets.symmetric(horizontal: 16.0, vertical: 24.0),
                child: TextField(
                  decoration: InputDecoration(
                    border: OutlineInputBorder(),
                    isDense: true,
                    hintText: 'dd/MM/yyyy',
                  ),
                  keyboardType: TextInputType.number,
                  inputFormatters: [
                    FilteringTextInputFormatter.allow(RegExp(r'\d+|-|/')),
                    DateInputFormatter(),
                  ],
                  style: TextStyle(fontSize: 16.0, color: Colors.black),
                ),
              ),
            ],
          ),
        ),
      ),
    );
  }
}