huixiang_app/lib/view_widget/separator.dart

import 'package:flutter/material.dart';

class MySeparator extends StatelessWidget {
  final double height;
  final double width;
  final Color color;

  const MySeparator(
      {this.height = 1, this.width = 1, this.color = Colors.black});

  @override
  Widget build(BuildContext context) {
    return LayoutBuilder(
      builder: (BuildContext context, BoxConstraints constraints) {
        final boxWidth = constraints.constrainWidth();
        final boxHeight = constraints.constrainHeight();
        final dashWidth = width;
        final dashHeight = height;
        var dashCount = 1;
        if (width > height) {
          dashCount = (boxWidth / (2 * dashWidth)).floor();
        } else {
          dashCount = (boxHeight / (2 * dashHeight)).floor();
        }
        return Flex(
          children: List.generate(dashCount, (_) {
            return SizedBox(
              width: dashWidth,
              height: dashHeight,
              child: DecoratedBox(
                decoration: BoxDecoration(color: color),
              ),
            );
          }),
          mainAxisAlignment: MainAxisAlignment.spaceBetween,
          direction: width > height ? Axis.horizontal : Axis.vertical,
        );
      },
    );
  }
}