App_Flutter/lib/view/component/guide.dart

import 'package:fast/utils/global.dart';
import 'package:fast/utils/size_fit.dart';
import 'package:flutter/material.dart';

class Guide extends StatefulWidget {
  double endLeft, endTop, left, top;
  Guide(
      {Key? key,
      required this.endLeft,
      required this.endTop,
      required this.left,
      required this.top})
      : super(key: key);

  @override
  State<Guide> createState() => _GuideState();
}

class _GuideState extends State<Guide> {
  int index = 0;
  @override
  Widget build(BuildContext context) {
    SizeFit.initialize(context);
    var size = MediaQuery.of(context).size;
    var top = 180.px + size.height > 667.px ? 30.px : 10.px;
    var isBig = size.height > 667.px;
    double left1 = widget.left - 16.px;
    double top1 = widget.top + top + 60.px;

    double left2 = widget.endLeft - 74.px + 40.px;
    double top2 = widget.endTop + 40.px;

    double top3 = Global().circleWidth / 2.0 + top;
    if (!isBig) {
      left1 -= 6.px;
      top1 -= 45.px;
      top2 -= 20.px;
      top3 -= 30.px;
    }
    return Stack(
      children: [
        if (index == 0)
          Positioned(
              left: left1,
              top: top1,
              child: Image.asset(
                'assets/images/tip0.png',
                width: 118.px,
                height: 118.px,
              )),
        if (index == 1)
          Positioned(
              left: left2,
              top: top2,
              child: Image.asset(
                'assets/images/tip1.png',
                width: 148.px,
                height: 190.px,
              )),
        if (index == 2)
          Positioned(
              left: 375.px / 2.0 - 93.px,
              top: top3,
              child: Image.asset(
                'assets/images/tip2.png',
                width: 186.px,
                height: 138.px,
              )),
        Positioned(
            child: GestureDetector(
          onTap: () => touchBtn(),
          onVerticalDragStart: (details) => touchBtn(),
          onHorizontalDragStart: (details) => touchBtn(),
          onLongPress: ()=>touchBtn(),
        ))
      ],
    );
  }

  touchBtn() {
    setState(() {
      index = index + 1;
      if (index > 2) {
        Navigator.of(context).pop();
      }
    });
  }
}