PasswordStrengthChecker

This is a Widget to check the strength of the password in a visual way, with an animation when the strength changes according to the settings given by the user.

Features

Getting started

You can use the default PasswordStrength enum to set the strength of the password, or you can create your own enum that implements PasswordStrengthItem and use it. For example:

enum CustomPassStrength implements PasswordStrengthItem {
  weak,
  medium,
  strong;

  @override
  Color get statusColor {
    switch (this) {
      case CustomPassStrength.weak:
        return Colors.red;
      case CustomPassStrength.medium:
        return Colors.orange;
      case CustomPassStrength.strong:
        return Colors.green;
    }
  }

  @override
  Widget? get statusWidget {
    switch (this) {
      case CustomPassStrength.weak:
        return const Text('Weak');
      case CustomPassStrength.medium:
        return const Text('Medium');
      case CustomPassStrength.strong:
        return const Text('Strong');
      default:
        return null;
    }
  }

  @override
  double get widthPerc {
    switch (this) {
      case CustomPassStrength.weak:
        return 0.15;
      case CustomPassStrength.medium:
        return 0.4;
      case CustomPassStrength.strong:
        return 0.75;
      default:
        return 0.0;
    }
  }

  static CustomPassStrength? calculate({required String text}) {
    // Implement your custom logic here
    if (text.isEmpty) {
      return null;
    }
    if (text.length < 6) {
      return CustomPassStrength.weak;
    } else if (text.length < 10) {
      return CustomPassStrength.medium;
    } else {
      return CustomPassStrength.strong;
    }
  }
}

Usage

import 'package:flutter/material.dart';
import 'package:password_strength_checker/password_strength_checker.dart';

class HomePage extends StatelessWidget {
  const HomePage({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    final passNotifier = ValueNotifier<PasswordStrength?>(null);

    return Scaffold(
      body: Padding(
        padding: const EdgeInsets.all(8.0),
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            TextField(
              decoration: const InputDecoration(
                border: OutlineInputBorder(),
                labelText: 'Password',
              ),
              onChanged: (value) {
                passNotifier.value = PasswordStrength.calculate(text: value);
              },
            ),
            const SizedBox(height: 20),
            PasswordStrengthChecker(
              strength: passNotifier,
            ),
          ],
        ),
      ),
    );
  }
}

GitHub

View Github