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;

  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});

  @override
  Widget build(BuildContext context) {
    return Column(
      mainAxisSize: MainAxisSize.min,
      children: <Widget>[
        Padding(
          padding: const EdgeInsets.fromLTRB(0, 50, 0, 0),
          child: Image.asset("lib/assets/img/${this.assets}"),
        ),
        Padding(
          padding: const EdgeInsets.fromLTRB(0, 12, 0, 12),
          child: Text(
            this.msg,
            style: Theme.of(context).textTheme.bodyText2,
          ),
        ),
        if (callback != null)
          Padding(
            padding: const EdgeInsets.all(16.0),
            child: OutlineButton(
              child: Text(
                "$action",
                style: TextStyle(fontSize: 14.0),
              ),
              clipBehavior: Clip.hardEdge,
              shape: StadiumBorder(),
              textColor: Color(0xff666666),
              color: Color(0xff666666),
              highlightedBorderColor: Theme.of(context).accentColor,
              highlightColor: Theme.of(context).accentColor,
              onPressed: callback,
            ),
          ),
        if (this.marginBottom == true)
          SizedBox(
            height: 50,
          )
      ],
    );
  }
}