An innovative approach for converting CSS animations to flutter projects

During a recent collaboration with fellow designers, they shared some CSS animation examples from CodePen that needed to be integrated into our current project. The animations ranged from simple to complex, like the following:

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100vh;
  background-color: black;
}

.music {
  display: inline-flex;
  align-items: center;
  justify-content: space-between;
  position: relative;
  width: 300px;
  height: 200px;
}

.music .bar {
  width: 12px;
  height: 2px;
  border-radius: 10px;
  background-color: white;
  animation: up_down 1.5s ease-in-out infinite;
}

@keyframes up_down {
  0%,
  100% {
    height: 2px;
  }
  50% {
    height: 80px;
  }
}

.music .bar:nth-child(1) {
  background-color: purple;
  animation-delay: 1s;
}

.music .bar:nth-child(2) {
  background-color: crimson;
  animation-delay: 0.8s;
}

.music .bar:nth-child(3) {
  background-color: deeppink;
  animation-delay: 0.6s;
}

// More bar styles...

<div class='music'>
  <div class='bar'></div>
  <div class='bar'></div>
  <div class='bar'></div>
  <div class='bar'></div>
  <div class='bar'></div>
  <div class='bar'></div>
  <div class='bar'></div>
  <div class='bar'></div>
  <div class='bar'></div>
  <div class='bar'></div>
</div>

While I had previously created animations using Flutter Canvas, I am now curious if there is a more efficient way to incorporate CSS animations into a Flutter project (something that was once straightforward for websites).

Answer №1

First Step: To get started, place the following code in a file named index.html within the assets folder:

<div class='music'>
  <div class='bar'></div>
  <div class='bar'></div>
  <div class='bar'></div>
  <div class='bar'></div>
  <div class='bar'></div>
  <div class='bar'></div>
  <div class='bar'></div>
  <div class='bar'></div>
  <div class='bar'></div>
  <div class='bar'></div>
</div>

<style>
  * {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
  }

  body {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100vh;
    background-color: black;
  }

  .music {
    display: inline-flex;
    align-items: center;
    justify-content: space-between;
    position: relative;
    width: 300px;
    height: 200px;
  }

  .music .bar {
    width: 12px;
    height: 2px;
    border-radius: 10px;
    background-color: white;
    animation: up_down 1.5s ease-in-out infinite;
  }

  @keyframes up_down {
    0%, 100% {
      height: 2px;
    }
    50% {
      height: 80px;
    }
  }

  .music .bar:nth-child(1) {
    background-color: purple;
    animation-delay: 1s;
  }

  .music .bar:nth-child(2) {
    background-color: crimson;
    animation-delay: 0.8s;
  }

  .music .bar:nth-child(3) {
    background-color: deeppink;
    animation-delay: 0.6s;
  }

  /* Remaining bar styling goes here */

</style>

Next Step: After setting up the HTML file, install the webview_flutter package and then add the following code snippet to your Flutter project:

import 'package:flutter/services.dart';
import 'package:webview_flutter/webview_flutter.dart';

class HtmlWidgetExample extends StatefulWidget {
  const HtmlWidgetExample({super.key});

  @override
  State<HtmlWidgetExample> createState() => _HtmlWidgetExampleState();
}

class _HtmlWidgetExampleState extends State<HtmlWidgetExample> {
  String? htmlContent;

  @override
  void initState() {
    super.initState();
    loadHtml();
  }

  loadHtml() async {
    htmlContent = await rootBundle.loadString('assets/index.html');
    setState(() {});
  }

  @override
  Widget build(BuildContext context) {
    if (htmlContent == null) return const SizedBox();
    return WebView(
      initialUrl: Uri.dataFromString(
        htmlContent!,
        mimeType: 'text/html',
        encoding: Encoding.getByName('utf-8'),
      ).toString(),
      backgroundColor: Colors.transparent,
      javascriptMode: JavascriptMode.unrestricted,
      onPageFinished: (String url) {},
    );
  }
}

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