flutter-sport/lib/widgets/dialog/request_dialog.dart

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

typedef ApiCall = Future Function();

Future request(BuildContext context, ApiCall api) async {
  var start = DateTime.now().millisecondsSinceEpoch;
  var pop = false;
  showDialog(
      barrierDismissible: false,
      context: context,
      child: Dialog(
          backgroundColor: Colors.transparent,
          elevation: 0,
          child: GestureDetector(
            onTap: () {
              var end = DateTime.now().millisecondsSinceEpoch;
              if (end - start > 10 * 1000) {
                pop = true;
                Navigator.of(context).pop();
              }
            },
            child: Container(
                padding: EdgeInsets.all(16.0),
                child: Column(
                  mainAxisSize: MainAxisSize.min,
                  children: <Widget>[
                    Container(
                      width: 100,
                      height: 100,
                      decoration: BoxDecoration(
                        borderRadius: BorderRadius.all(Radius.circular(10.0)),
                        color: Colors.black45,
                      ),
                      child: SpinKitFadingCircle(
                        color: Theme.of(context).accentColor,
                      ),
                    ),
                  ],
                )),
          )));
  var data = await api.call().catchError((onError) {
    print("[onError]:$onError");
  });
  if (!pop) Navigator.of(context).pop();
  return data;
}