CODEWITHSUNDEEP
flutterdarttextwidget
Randy ortan
Randy ortan

Reputation: 97

How to animate the color of a text with multiple colors flutter

I want my text to animate through multiple colors in flutter how can I do it.

Upvotes: 3

Views: 10415

Answers (2)

Pablo Lanza
Pablo Lanza

Reputation: 358

The example below animate a text color through a Colors range.

import 'package:flutter/material.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatefulWidget {
  @override
  MyAppState createState() {
    return MyAppState();
  }
}

class MyAppState extends State<MyApp> with SingleTickerProviderStateMixin{
  AnimationController controller;
  Animation animation;
  Color color;

  @override
  @mustCallSuper
  void initState() {
    super.initState();
    controller=AnimationController(
      vsync: this,
      duration: Duration(seconds: 5)
    );
    animation=ColorTween(begin:Colors.red,end: Colors.white).animate(controller);

    animation.addListener((){
      setState(() {
        color=animation.value;
      });
    });

    controller.forward();
  }

  @override
  Widget build(BuildContext context) {

    return MaterialApp(home:Scaffold(

        appBar: AppBar(title: Text("Example")),
        body:Center(child:Text("HELLO!!!",textScaleFactor:3,style: TextStyle(color: color),))));
  }
}

Upvotes: 1

ilikerobots
ilikerobots

Reputation: 787

Pablo's answer (using ColorTween) will animate the color between two values. In order to transition among several colors, you can adapt that solution to either

  • build a "TweenSequence" chaining multiple color tweens
  • use RainbowColor which simplifies transition between multiple colors

See my article Multicolor Transitions in Flutter for a walkthrough on doing either.

For reference, here's a multi-color (B->G->R) animated text widget using RainbowColor.

class ColorText extends StatefulWidget {
  const ColorText({
    Key key,
  }) : super(key: key);

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

class _ColorTextState extends State<ColorText>
    with SingleTickerProviderStateMixin {
  AnimationController controller;
  Animation<Color> _colorAnim;

  @override
  void initState() {
    super.initState();
    controller = AnimationController(duration: Duration(seconds: 3), vsync: this);
    _colorAnim = RainbowColorTween([Colors.blue, 
                                    Colors.green, 
                                    Colors.red, 
                                    Colors.blue])
            .animate(controller)
              ..addListener(() { setState(() {}); })
              ..addStatusListener((status) {
                if (status == AnimationStatus.completed) {
                  controller.reset();
                  controller.forward();
                } else if (status == AnimationStatus.dismissed) {
                  controller.forward();
                }
              });
    controller.forward();
  }

  @override
  Widget build(BuildContext context) {
    return Text("Hello!", style: TextStyle(color: _colorAnim.value));
  }
}

Upvotes: 4

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