OpenMediacenterMobileFlutter/lib/navigation/shuffle_screen.dart

import 'dart:convert';
import 'dart:math';
import 'package:flutter/material.dart';

import '../drawer/my_drawer.dart';
import '../preview/preview_grid.dart';
import '../api/api.dart';
import '../utils/platform.dart';
import '../types/video.dart';

class ShuffleScreen extends StatefulWidget {
  const ShuffleScreen({Key? key}) : super(key: key);

  @override
  State<ShuffleScreen> createState() => _ShuffleScreenState();
}

class _ShuffleScreenState extends State<ShuffleScreen> {
  Future<List<VideoT>> loadData(int nr) async {
    final data = await API.query("video", "getRandomMovies",
        {'Number': nr, 'Seed': Random().nextInt(0x7fffffff)});

    final d = jsonDecode(data);

    List<VideoT> dta =
        (d['Videos'] as List).map((e) => VideoT.fromJson(e)).toList();

    return dta;
  }

  @override
  Widget build(BuildContext context) {
    double width = MediaQuery.of(context).size.width;

    return Scaffold(
        appBar: AppBar(
          title: Text("Shuffle"),
        ),
        body: PreviewGrid(
          videoLoader: () {
            return loadData((isTV() ? width ~/ 200 : width ~/ 275) * 2);
          },
          footerBuilder: (state) => Column(
            children: [
              const SizedBox(
                height: 25,
              ),
              TextButton.icon(
                onPressed: () {
                  state.loadData();
                },
                icon: const Icon(Icons.update),
                label: const Text("Shuffle"),
              ),
              const SizedBox(
                height: 25,
              ),
            ],
          ),
        ),
        drawer: MyDrawer());
  }
}