Client/lib/widget/loadingSpinner.dart

import 'dart:async';

import 'package:flutter/material.dart';

class LoadingSpinner extends StatefulWidget {
  final String? infoText;
  const LoadingSpinner({this.infoText, super.key});

  @override
  State<LoadingSpinner> createState() => _LoadingSpinnerState();
}

class _LoadingSpinnerState extends State<LoadingSpinner> {
  bool textVisible = false;
  late Timer timer;

  @override
  void initState() {
     timer = Timer(const Duration(seconds: 30), () {
      setState(() {
        textVisible = true;
      });
    });

    super.initState();
  }

  @override
  Widget build(BuildContext context) {
    return Center(
      child: Column(
        mainAxisAlignment: MainAxisAlignment.center,
        children: [
          Visibility(
            visible: !textVisible,
            replacement: const Icon(Icons.sentiment_dissatisfied_outlined),
            child: Column(
              children: [
                if(widget.infoText != null) Text(widget.infoText!),
                const SizedBox(height: 10),
                const CircularProgressIndicator()
              ],
            ),
          ),
          const SizedBox(height: 30),
          Visibility(
            visible: textVisible,
            child: const Text(
                textAlign: TextAlign.center,
                "Irgendetwas funktioniert nicht!\nBist du mit dem Internet verbunden?\n\nVersuche die App neuzustarten"
            ),
          ),
        ],
      ),
    );
  }

  @override
  void dispose() {
    timer.cancel();
    super.dispose();
  }
}