main.dart

// Copyright 2020 Sarbagya Dhaubanjar. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

import 'dart:developer';

import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
import 'package:youtube_player_iframe/youtube_player_iframe.dart';
import 'package:youtube_player_iframe_example/video_list_page.dart';

import 'widgets/meta_data_section.dart';
import 'widgets/play_pause_button_bar.dart';
import 'widgets/player_state_section.dart';
import 'widgets/source_input_section.dart';

const List<String> _videoIds = [
  'tcodrIK2P_I',
  'H5v3kku4y6Q',
  'nPt8bK2gbaU',
  'K18cpp_-gP8',
  'iLnmTe5Q2Qw',
  '_WoCV4c6XOE',
  'KmzdUe0RSJo',
  '6jZDSSZZxjQ',
  'p2lYr3vM_1w',
  '7QUtEmBT_-w',
  '34_PXCzGw1M'
];

Future<void> main() async {
  runApp(YoutubeApp());
}

///
class YoutubeApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Youtube Player IFrame Demo',
      theme: ThemeData.from(
        colorScheme: ColorScheme.fromSeed(
          seedColor: Colors.deepPurple,
          brightness: Brightness.dark,
        ),
        useMaterial3: true,
      ),
      debugShowCheckedModeBanner: false,
      home: YoutubeAppDemo(),
    );
  }
}

///
class YoutubeAppDemo extends StatefulWidget {
  @override
  _YoutubeAppDemoState createState() => _YoutubeAppDemoState();
}

class _YoutubeAppDemoState extends State<YoutubeAppDemo> {
  late YoutubePlayerController _controller;

  @override
  void initState() {
    super.initState();
    _controller = YoutubePlayerController(
      params: const YoutubePlayerParams(
        showControls: true,
        mute: false,
        showFullscreenButton: true,
        loop: false,
      ),
    );

    _controller.setFullScreenListener(
      (isFullScreen) {
        log('${isFullScreen ? 'Entered' : 'Exited'} Fullscreen.');
      },
    );

    _controller.loadPlaylist(
      list: _videoIds,
      listType: ListType.playlist,
      startSeconds: 136,
    );
  }

  @override
  Widget build(BuildContext context) {
    return YoutubePlayerScaffold(
      controller: _controller,
      builder: (context, player) {
        return Scaffold(
          appBar: AppBar(
            title: const Text('Youtube Player IFrame Demo'),
            actions: const [VideoPlaylistIconButton()],
          ),
          body: LayoutBuilder(
            builder: (context, constraints) {
              if (kIsWeb && constraints.maxWidth > 750) {
                return Row(
                  crossAxisAlignment: CrossAxisAlignment.start,
                  children: [
                    Expanded(
                      flex: 3,
                      child: Column(
                        children: [
                          player,
                          const VideoPositionIndicator(),
                        ],
                      ),
                    ),
                    const Expanded(
                      flex: 2,
                      child: SingleChildScrollView(
                        child: Controls(),
                      ),
                    ),
                  ],
                );
              }

              return ListView(
                children: [
                  player,
                  const VideoPositionIndicator(),
                  const Controls(),
                ],
              );
            },
          ),
        );
      },
    );
  }

  @override
  void dispose() {
    _controller.close();
    super.dispose();
  }
}

///
class Controls extends StatelessWidget {
  ///
  const Controls();

  @override
  Widget build(BuildContext context) {
    return Padding(
      padding: const EdgeInsets.all(16),
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          MetaDataSection(),
          _space,
          SourceInputSection(),
          _space,
          PlayPauseButtonBar(),
          _space,
          const VideoPositionSeeker(),
          _space,
          PlayerStateSection(),
        ],
      ),
    );
  }

  Widget get _space => const SizedBox(height: 10);
}

///
class VideoPlaylistIconButton extends StatelessWidget {
  ///
  const VideoPlaylistIconButton({super.key});

  @override
  Widget build(BuildContext context) {
    final controller = context.ytController;

    return IconButton(
      onPressed: () async {
        controller.pauseVideo();
        await Navigator.push(
          context,
          MaterialPageRoute(
            builder: (context) => const VideoListPage(),
          ),
        );
        controller.playVideo();
      },
      icon: const Icon(Icons.playlist_play_sharp),
    );
  }
}

///
class VideoPositionIndicator extends StatelessWidget {
  ///
  const VideoPositionIndicator({super.key});

  @override
  Widget build(BuildContext context) {
    final controller = context.ytController;

    return StreamBuilder<YoutubeVideoState>(
      stream: controller.videoStateStream,
      initialData: const YoutubeVideoState(),
      builder: (context, snapshot) {
        final position = snapshot.data?.position.inMilliseconds ?? 0;
        final duration = controller.metadata.duration.inMilliseconds;

        return LinearProgressIndicator(
          value: duration == 0 ? 0 : position / duration,
          minHeight: 1,
        );
      },
    );
  }
}

///
class VideoPositionSeeker extends StatelessWidget {
  ///
  const VideoPositionSeeker({super.key});

  @override
  Widget build(BuildContext context) {
    var value = 0.0;

    return Row(
      children: [
        const Text(
          'Seek',
          style: TextStyle(fontWeight: FontWeight.w300),
        ),
        const SizedBox(width: 14),
        Expanded(
          child: StreamBuilder<YoutubeVideoState>(
            stream: context.ytController.videoStateStream,
            initialData: const YoutubeVideoState(),
            builder: (context, snapshot) {
              final position = snapshot.data?.position.inSeconds ?? 0;
              final duration = context.ytController.metadata.duration.inSeconds;

              value = position == 0 || duration == 0 ? 0 : position / duration;

              return StatefulBuilder(
                builder: (context, setState) {
                  return Slider(
                    value: value,
                    onChanged: (positionFraction) {
                      value = positionFraction;
                      setState(() {});

                      context.ytController.seekTo(
                        seconds: (value * duration).toDouble(),
                        allowSeekAhead: true,
                      );
                    },
                    min: 0,
                    max: 1,
                  );
                },
              );
            },
          ),
        ),
      ],
    );
  }
}