Runtime effects

Adding/Removing effects at runtime is quite easy. The Newton widget internally uses an InheritedWidget to provide access to its state via Newton.of(context). The only constraint is that the Newton widget must be a parent of the widget from which you want to add or remove effects.

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(title: const Text('Newton Particle Effects Example')),
        body: Newton(
          child: HomeScreen(),
        ),
      ),
    );
  }
}

class HomeScreen extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Center(
      child: TextButton(
        onPressed: () {
            Newton.of(context).addEffect(
              RelativisticEffectConfiguration(
                gravity: Gravity.earthGravity,
                origin: Offset.zero,
                maxOriginOffset: const Offset(1, 0),
                maxAngle: 90,
                maxEndScale: 1,
                maxFadeOutThreshold: 0.8,
                maxParticleLifespan: const Duration(seconds: 7),
                minAngle: 90,
                minEndScale: 1,
                minFadeOutThreshold: 0.6,
                minParticleLifespan: const Duration(seconds: 4),
                particleConfiguration: const ParticleConfiguration(
                  shape: CircleShape(),
                  size: Size(5, 5),
                ),
              ),
            );
        },
        child: const Text('Add Particle Effect'),
      ),
    );
  }
}