animated_interpolation 0.1.1

A flutter interpolation plugin inspired by the React Native interpolation animation

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animated_interpolation

A flutter interpolation plugin inspired by the React Native interpolation animation

Usage

To use this plugin, add animated_interpolation as a dependency in your pubspec.yaml file.

InterpolationTween

constructor

Parameter	Required	Default	Description
inputRange	YES	NULL	Set the range of input,eg: [0,0.2,0.5,0.8,1]
outputRange	YES	NULL	Set the range of input eg: [10,100,105,200,300]
curve	NO	_Linear._()	Set the input/output animation curve
extrapolate	NO	NULL	it will extrapolate the curve beyond the ranges given, but you can also have it clamp the output value
extrapolateLeft	NO	ExtrapolateType.extend	It will extrapolate the curve beyond the given left range
extrapolateRight	NO	ExtrapolateType.extend	It will extrapolate the curve beyond the given right range

Example

import 'package:flutter/material.dart';
import 'package:animated_interpolation/animated_interpolation.dart';
class AnimatedLogo1 extends AnimatedWidget {
  // The Tweens are static because they don't change.
  static final _opacityTween = new InterpolationTween<double>(inputRange: [0,0.2,1], outputRange: [0,0.5,1]);
  static final _sizeTween = new InterpolationTween(inputRange: [0,0.2,1], outputRange: [0,250,300]);

  AnimatedLogo1({Key key, Animation<double> animation})
      : super(key: key, listenable: animation);

  Widget build(BuildContext context) {
    final Animation<double> animation = listenable;
    return new Center(
      child: new Opacity(
        opacity: _opacityTween.evaluate(animation),
        child: new Container(
          margin: new EdgeInsets.symmetric(vertical: 10.0),
          height: _sizeTween.evaluate(animation),
          width: _sizeTween.evaluate(animation),
          child: new FlutterLogo(),
        ),
      ),
    );
  }
}

class LogoApp4 extends StatefulWidget {
  _LogoAppState createState() => new _LogoAppState();
}

class _LogoAppState extends State<LogoApp4> with TickerProviderStateMixin {
  AnimationController controller;
  Animation<double> animation;

  initState() {
    super.initState();
    controller = new AnimationController(
        duration: const Duration(milliseconds: 2000), vsync: this);
    animation = new CurvedAnimation(parent: controller, curve: Curves.easeIn);


    animation.addStatusListener((status) {
      if (status == AnimationStatus.completed) {
        controller.reverse();
      } else if (status == AnimationStatus.dismissed) {
        controller.forward();
      }
    });

    controller.forward();
  }

  Widget build(BuildContext context) {
    return new AnimatedLogo1(animation: animation);
  }

  dispose() {
    controller.dispose();
    super.dispose();
  }
}