51686868/gradient-text-in-flutter

main.dart

// https://gist.github.com/NearHuscarl/195907b36fef5aefbf8682133b95c01d

import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      debugShowCheckedModeBanner: false,
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  final String title;
  MyHomePage({Key? key, required this.title}) : super(key: key);

  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  @override
  Widget build(BuildContext context) {
    final veryDarkRed = darken(Colors.red, .4);
    final darkRed = darken(Colors.red, .2);
    final red = Colors.red;
    final lightRed = lighten(Colors.red);
    final veryLightRed = lighten(Colors.red, .3);

    return Scaffold(
      body: SizedBox.expand(
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.center,
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            GradientText(
              'Hello Flutter',
              gradient: LinearGradient(colors: [
                Colors.blue.shade400,
                Colors.blue.shade900,
              ]),
            ),
            GradientText(
              'Rainbow',
              gradient: LinearGradient(colors: [
                Colors.red,
                Colors.pink,
                Colors.purple,
                Colors.deepPurple,
                Colors.deepPurple,
                Colors.indigo,
                Colors.blue,
                Colors.lightBlue,
                Colors.cyan,
                Colors.teal,
                Colors.green,
                Colors.lightGreen,
                Colors.lime,
                Colors.yellow,
                Colors.amber,
                Colors.orange,
                Colors.deepOrange,
              ]),
            ),
            GradientText(
              'Fade out',
              gradient: LinearGradient(
                colors: [
                  Colors.black,
                  Colors.white,
                ],
                begin: Alignment.topLeft,
                end: Alignment.bottomRight,
              ),
            ),
          ],
        ),
      ),
    );
  }
}

class GradientText extends StatelessWidget {
  GradientText(
    this.text, {
    @required this.gradient,
  });

  final String text;
  final Gradient gradient;

  @override
  Widget build(BuildContext context) {
    return ShaderMask(
      shaderCallback: (bounds) => gradient.createShader(
        Rect.fromLTWH(0, 0, bounds.width, bounds.height),
      ),
      child: Text(
        text,
        style: TextStyle(
          // The color must be set to white for this to work
          color: Colors.white,
          fontSize: 40,
        ),
      ),
    );
  }
}