H5_Flutter/lib/view/component/marquee.dart

import 'dart:async';

import 'package:flutter/material.dart';

class Marquee extends StatefulWidget {
  Widget child;
  double offset;
  Marquee({Key? key, required this.child, required this.offset})
      : super(key: key);

  @override
  State<Marquee> createState() => _MarqueeState();
}

class _MarqueeState extends State<Marquee> {
  late ScrollController controller;
  late Timer timer;
  double stepOffset = 50.0;
  Duration duration = const Duration(seconds: 5);

  // @override
  // void initState() {
  //   // TODO: implement initState
  //   super.initState();
  //   controller = ScrollController(initialScrollOffset: widget.offset);
  //   timer = Timer.periodic(const Duration(milliseconds: 100), (timer) {
  //     double newOffset = controller.offset + stepOffset;
  //     if (newOffset != widget.offset) {
  //       widget.offset = newOffset;
  //       controller.animateTo(widget.offset,
  //           duration: duration, curve: Curves.linear);
  //     }
  //   });
  // }

  @override
  void initState() {
    // TODO: implement initState
    super.initState();
    controller = ScrollController(initialScrollOffset: widget.offset);
    double i = 0.5;
    timer = Timer.periodic(const Duration(milliseconds: 50), (timer) {
      i=i+0.5;
      controller.jumpTo(widget.offset + i);
    });
  }

  @override
  void dispose() {
    // TODO: implement dispose
    timer.cancel();
    controller.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return ListView.builder(
        scrollDirection: Axis.horizontal,
        physics: const NeverScrollableScrollPhysics(),
        controller: controller,
        itemBuilder: (context, index) {
          return widget.child;
        });
  }
}