383462ef
 吴启风
feat: 新增视频专区列表与播放功能
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import 'dart:async';
import 'package:flutter/material.dart';
import 'package:video_player/video_player.dart';
import 'package:wow_english/common/request/dao/video_dao.dart';
import 'video_zone_item.dart';
class VideoZonePlayerPage extends StatefulWidget {
const VideoZonePlayerPage({
super.key,
required this.items,
this.initialVideoId,
}) : assert(items.length > 0, '视频播放列表不能为空');
final List<VideoZoneItem> items;
final int? initialVideoId;
@override
State<VideoZonePlayerPage> createState() => _VideoZonePlayerPageState();
}
class _VideoZonePlayerPageState extends State<VideoZonePlayerPage>
with WidgetsBindingObserver {
VideoPlayerController? _controller;
Timer? _progressTimer;
late int _currentIndex;
double _playbackSpeed = 1;
bool _showControls = true;
bool _switchingVideo = false;
bool _handlingCompletion = false;
int? _lastReportedPosition;
int? _completedReportedVideoId;
Object? _loadError;
VideoZoneItem get _currentItem => widget.items[_currentIndex];
@override
void initState() {
super.initState();
WidgetsBinding.instance.addObserver(this);
final index = widget.initialVideoId == null
? 0
: widget.items.indexWhere((item) => item.id == widget.initialVideoId);
_currentIndex = index < 0 ? 0 : index;
_loadCurrentVideo();
}
Future<void> _loadCurrentVideo() async {
_progressTimer?.cancel();
final oldController = _controller;
oldController?.removeListener(_onVideoChanged);
final controller =
VideoPlayerController.networkUrl(Uri.parse(_currentItem.videoUrl));
_controller = controller;
_loadError = null;
if (mounted) {
setState(() {});
}
await oldController?.dispose();
try {
await controller.initialize();
if (!mounted || controller != _controller) {
await controller.dispose();
return;
}
await controller.setLooping(false);
await controller.setPlaybackSpeed(_playbackSpeed);
final savedProgress =
_currentItem.completed ? 0 : _currentItem.progressSeconds;
if (savedProgress > 0 &&
savedProgress < controller.value.duration.inSeconds) {
await controller.seekTo(Duration(seconds: savedProgress));
}
controller.addListener(_onVideoChanged);
await controller.play();
_lastReportedPosition = null;
_handlingCompletion = false;
_progressTimer = Timer.periodic(
const Duration(seconds: 5),
(_) => _reportCurrentProgress(),
);
setState(() {});
} catch (error) {
if (mounted && controller == _controller) {
setState(() => _loadError = error);
}
}
}
void _onVideoChanged() {
final controller = _controller;
if (!mounted || controller == null) return;
if (controller.value.isCompleted &&
!_switchingVideo &&
!_handlingCompletion &&
_completedReportedVideoId != _currentItem.id) {
_handlingCompletion = true;
unawaited(_handleVideoCompleted());
return;
}
setState(() {});
}
Future<void> _playNext({bool currentCompleted = false}) async {
if (_switchingVideo || _currentIndex >= widget.items.length - 1) return;
_switchingVideo = true;
await _reportCurrentProgress(completed: currentCompleted, force: true);
setState(() => _currentIndex++);
await _loadCurrentVideo();
_switchingVideo = false;
}
Future<void> _handleVideoCompleted() async {
if (_currentIndex < widget.items.length - 1) {
await _playNext(currentCompleted: true);
} else {
await _reportCurrentProgress(completed: true, force: true);
}
_handlingCompletion = false;
}
Future<void> _togglePlay() async {
final controller = _controller;
if (controller == null || !controller.value.isInitialized) return;
if (controller.value.isCompleted) {
await controller.seekTo(Duration.zero);
_completedReportedVideoId = null;
}
if (controller.value.isPlaying) {
await controller.pause();
await _reportCurrentProgress(force: true);
} else {
await controller.play();
}
if (mounted) setState(() {});
}
Future<void> _setSpeed(double speed) async {
_playbackSpeed = speed;
await _controller?.setPlaybackSpeed(speed);
if (mounted) setState(() {});
}
@override
void dispose() {
WidgetsBinding.instance.removeObserver(this);
_progressTimer?.cancel();
_controller?.removeListener(_onVideoChanged);
unawaited(_reportCurrentProgress(force: true));
_controller?.dispose();
super.dispose();
}
@override
void didChangeAppLifecycleState(AppLifecycleState state) {
if (state == AppLifecycleState.inactive ||
state == AppLifecycleState.paused ||
state == AppLifecycleState.detached) {
unawaited(_reportCurrentProgress(force: true));
}
}
Future<void> _reportCurrentProgress({
bool? completed,
bool force = false,
}) async {
final controller = _controller;
if (controller == null || !controller.value.isInitialized) return;
final durationSeconds = controller.value.duration.inSeconds > 0
? controller.value.duration.inSeconds
: _currentItem.durationSeconds;
final progressSeconds = controller.value.position.inSeconds
.clamp(0, durationSeconds > 0 ? durationSeconds : 0);
final isCompleted = completed ?? controller.value.isCompleted;
if (!force && _lastReportedPosition == progressSeconds) return;
if (isCompleted && _completedReportedVideoId == _currentItem.id) return;
_lastReportedPosition = progressSeconds;
try {
await VideoDao.savePlayRecord(
videoId: _currentItem.id,
progressSeconds: progressSeconds,
durationSeconds: durationSeconds,
completed: isCompleted,
);
if (isCompleted) _completedReportedVideoId = _currentItem.id;
} catch (error) {
debugPrint('保存视频播放记录失败: $error');
}
}
@override
Widget build(BuildContext context) {
final controller = _controller;
return Scaffold(
backgroundColor: Colors.black,
body: GestureDetector(
behavior: HitTestBehavior.opaque,
onTap: () => setState(() => _showControls = !_showControls),
onDoubleTap: _togglePlay,
child: Stack(
fit: StackFit.expand,
children: [
if (controller?.value.isInitialized == true)
Center(
child: AspectRatio(
aspectRatio: controller!.value.aspectRatio,
child: VideoPlayer(controller),
),
)
else if (_loadError != null)
Center(
child: Column(
mainAxisSize: MainAxisSize.min,
children: [
const Text('视频加载失败',
style: TextStyle(color: Colors.white, fontSize: 18)),
const SizedBox(height: 12),
FilledButton(
onPressed: _loadCurrentVideo, child: const Text('重试')),
],
),
)
else
const Center(child: CircularProgressIndicator()),
if (_showControls) _buildControls(controller),
],
),
),
);
}
Widget _buildControls(VideoPlayerController? controller) {
final initialized = controller?.value.isInitialized == true;
return ColoredBox(
color: Colors.black38,
child: SafeArea(
child: Column(
children: [
Row(
children: [
IconButton(
onPressed: () => Navigator.of(context).pop(),
icon:
const Icon(Icons.arrow_back_ios_new, color: Colors.white),
),
Expanded(
child: Text(
_currentItem.title,
maxLines: 1,
overflow: TextOverflow.ellipsis,
style: const TextStyle(color: Colors.white, fontSize: 20),
),
),
PopupMenuButton<double>(
initialValue: _playbackSpeed,
onSelected: _setSpeed,
itemBuilder: (_) => const [0.5, 0.75, 1.0, 1.25, 1.5, 2.0]
.map((speed) => PopupMenuItem(
value: speed,
child: Text('${speed}x'),
))
.toList(),
child: Padding(
padding: const EdgeInsets.symmetric(
horizontal: 18, vertical: 12),
child: Text('${_playbackSpeed}x',
style:
const TextStyle(color: Colors.white, fontSize: 16)),
),
),
],
),
const Spacer(),
if (initialized)
IconButton(
onPressed: _togglePlay,
iconSize: 68,
color: Colors.white,
icon: Icon(controller!.value.isPlaying
? Icons.pause_circle_filled
: Icons.play_circle_fill),
),
const Spacer(),
if (initialized)
Padding(
padding: const EdgeInsets.fromLTRB(20, 0, 20, 12),
child: Row(
children: [
Expanded(
child: VideoProgressIndicator(
controller!,
allowScrubbing: true,
padding: const EdgeInsets.symmetric(vertical: 12),
colors: const VideoProgressColors(
playedColor: Color(0xFF00B6F1),
bufferedColor: Colors.white54,
backgroundColor: Colors.white24,
),
),
),
const SizedBox(width: 12),
Text(
'${_formatDuration(controller.value.position)} / '
'${_formatDuration(controller.value.duration)}',
style: const TextStyle(color: Colors.white),
),
if (_currentIndex < widget.items.length - 1) ...[
const SizedBox(width: 8),
IconButton(
tooltip: '下一集',
onPressed: _playNext,
icon: const Icon(Icons.skip_next, color: Colors.white),
),
],
],
),
),
],
),
),
);
}
String _formatDuration(Duration duration) {
final minutes = duration.inMinutes.remainder(60).toString().padLeft(2, '0');
final seconds = duration.inSeconds.remainder(60).toString().padLeft(2, '0');
if (duration.inHours == 0) return '$minutes:$seconds';
return '${duration.inHours.toString().padLeft(2, '0')}:$minutes:$seconds';
}
}
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