PhysiGo/app/lib/widgets/datatable.dart

import 'dart:async';

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

class MyDataTable extends StatefulWidget {
  const MyDataTable({required this.name, Key? key}) : super(key: key);
  final String name;
  @override
  State<MyDataTable> createState() => _MyDataTableState();
}

class _MyDataTableState extends State<MyDataTable> {
  CollectionReference usersList = FirebaseFirestore.instance.collection("Users");
  @override
  Widget build(BuildContext context) {
    Future<List> userList = getUsersList();

    return Container(
      height: 450,
      alignment: const Alignment(0, -1),
      child: Scrollbar(
        child: SingleChildScrollView(
          child: FutureBuilder<dynamic>(
            future: userList,
            builder: (context, snapshot) {
              if (snapshot.connectionState == ConnectionState.waiting) {
                return const Text('Wait a moment');
              }
              if (snapshot.connectionState == ConnectionState.done) {
                return buildDataTable(snapshot.data, widget.name);
              }
              if (snapshot.hasError) {
                return const Text('Something went wrong');
              }
              return const Text("  ");
            },
          ),
        ),
      ),
    );
  }

  @override
  void initState() {
    super.initState();
  }

  Future<List> getUsersList() async {
    var querySnapshot = await usersList.orderBy(widget.name, descending: true).get();
    return querySnapshot.docs;
  }
}

Widget buildDataTable(snapshotData, String name) {
  final columns = ['Place', 'ID', 'Name', 'points'];

  return DataTable(
    columnSpacing: 10.0,
    columns: getColumns(columns),
    rows: getRows(snapshotData, name),
  );
}

List<DataColumn> getColumns(List<String> columns) {
  return columns.map((String column) {
    return DataColumn(
      label: Text(column),
    );
  }).toList();
}

List<DataRow> getRows(dynamic snapshotData, String name) {
  List<DataRow> rows = [];
  int length = snapshotData.length;
  for (int i = 0; i < length; i++) {
    dynamic user = snapshotData[i];
    bool anonymous = user["anonymous"];
    if (anonymous) {
      rows.add(DataRow(cells: [
        DataCell(Text("${i + 1}")),
        const DataCell(
          Text("anonym"),
        ),
        const DataCell(
          Text("name"),
        ),
        DataCell(
          Text("${user[name]}"),
        ),
      ]));
    } else {
      rows.add(DataRow(cells: [
        DataCell(Text("${i + 1}")),
        DataCell(
          Text("${user["shared_id"]}"),
        ),
        DataCell(
          Text(user["name"]),
        ),
        DataCell(
          Text("${user[name]}"),
        ),
      ]));
    }
  }
  return rows;
}