flutter-sport/lib/widgets/error.dart

import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';

class RequestErrorWidget extends StatelessWidget {
  final VoidCallback? callback;
  final String msg;
  final String assets;
  final String action;
  final bool marginBottom;
  final double padding;

  static const String ASSETS_NO_NETWORK = "emptypage-image-nonetwork.png";
  static const String ASSETS_NO_COMMENT = "emptypage-image-nocomment.png";
  static const String ASSETS_NO_INVITATION = "emptypage-image-noinvitation.png";
  static const String ASSETS_NO_MOTION = "emptypage-image-nomotion.png";
  static const String ASSETS_NO_RANK = "emptypage-image-noattainment.png";

  RequestErrorWidget(this.callback,
      {this.msg = "网络出错啦，请点击按钮重新加载",
      this.assets = ASSETS_NO_NETWORK,
      this.action = "重新加载",
      this.marginBottom = true,
      this.padding = 50});

  @override
  Widget build(BuildContext context) {
    return Column(
      mainAxisSize: MainAxisSize.min,
      children: <Widget>[
        Padding(
          padding: EdgeInsets.fromLTRB(0, this.padding, 0, 0),
          child: Image.asset("lib/assets/img/${this.assets}"),
        ),
        Padding(
          padding: const EdgeInsets.all(12.0),
          child: Text(
            this.msg,
            style: Theme.of(context).textTheme.bodyText2!,
          ),
        ),
        if (callback != null)
          Padding(
            padding: const EdgeInsets.all(16.0),
            child: OutlinedButton(
              child: Text(
                "$action",
                style: Theme.of(context).textTheme.bodyText1,
              ),
              style: ButtonStyle(shape: MaterialStateProperty.all(StadiumBorder())),
              clipBehavior: Clip.hardEdge,
              onPressed: callback,
            ),
          ),
        if (this.marginBottom == true)
          SizedBox(
            height:  this.padding,
          )
      ],
    );
  }
}