Flutter视差滚动效果插件parallaxj的使用

什么是它

演示视频

如何使用

该插件可以在 pub.dev 上找到。

Parallaxable(
    offsetRadio: 1.0 / 10,
    under: _underBackground(),
    above: _aboveBackground(),
)

自定义配置

const Parallaxable({
    Key? key,
    required this.above,
    required this.under,
    this.angle = math.pi / 9,
    this.rotateDiff = 1.1,
    this.offsetRadio = 1.0 / 6,
    this.offsetDepth = 2,
})

示例代码

以下是一个完整的示例代码，展示了如何在 Flutter 应用程序中使用 parallaxj 插件来实现视差滚动效果。

import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import 'package:flutter/painting.dart';
import 'package:parallaxj/parallaxj.dart';
import "dart:math";

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

class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);

  [@override](/user/override)
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: const MyHomePage(title: 'parallaxj Demo'),
    );
  }
}

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

  final String title;

  [@override](/user/override)
  State<MyHomePage> createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  int _counter = 0;

  void _incrementCounter() {
    setState(() {
      _counter++;
    });
  }

  [@override](/user/override)
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
      ),
      body: Center(
        child: SizedBox(
          width: 200,
          height: 400,
          child: Parallaxable(
            offsetRadio: 1.0 / 10,
            under: _underBackground(),
            above: _aboveBackground(),
          ),
        ),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: _incrementCounter,
        tooltip: 'Increment',
        child: const Icon(Icons.add),
      ),
    );
  }

  _underBackground() => const SizedBox(
        width: 200,
        height: 400,
        child: Padding(
          padding: EdgeInsets.only(top: 123),
          child: ColoredBox(
            color: Colors.redAccent,
          ),
        ),
      );

  _aboveBackground() => SizedBox(
      width: 200,
      height: 400,
      child: Padding(
        padding: const EdgeInsets.all(8.0),
        child: Column(
          children: [
            SizedBox(
                height: 200,
                child: Image.asset(
                  "images/ironman.png",
                  fit: BoxFit.fitWidth,
                )),
            const Text("钢铁侠（Iron Man）是美国漫威漫画旗下的超级英雄。有多代钢铁侠，其中最为著名的是托尼·史塔克，初次登场于《悬疑故事》第39期（1963年3月），是斯塔克工业（STARK INDUSTRIES）的CEO")
          ],
        ),
      ));
}