demo/xinhuaribao/lib/ui/video/video_recommend_list_page.dart

import 'package:flutter/material.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:news_app/constant/size_res.dart';
import 'package:news_app/ui/video/video_play_item_widget.dart';
import 'package:news_app/util/log.util.dart';
import 'package:visibility_detector/visibility_detector.dart';

import '../../model/video_new_model.dart';
import '../../provider/video_commend_provider.dart';

/// @author: bo.zeng
/// @email: cnhbwds@gmail.com
/// @date: 2025 2025/4/9 16:00
/// @description:
class VideoRecommendListPage extends ConsumerStatefulWidget {
  const VideoRecommendListPage({super.key});

  @override
  ConsumerState<VideoRecommendListPage> createState() =>
      _VideoRecommendListPageState();
}

final recommendListProvider =
    NotifierProvider<VideoRecommendProvider, List<VideoNewModel>>(() {
      return VideoRecommendProvider();
    });

class _VideoRecommendListPageState extends ConsumerState<VideoRecommendListPage>
    with AutomaticKeepAliveClientMixin {
  @override
  void initState() {
    super.initState();
    ref.read(recommendListProvider.notifier).fetchRecommendVideos();
  }

  bool _isVisible = false;
  int _currentPage = 0;

  void _onVisibilityChanged(VisibilityInfo info) {
    final visible = info.visibleFraction > 0.5;
    if (_isVisible != visible) {
      setState(() {
        _isVisible = visible;
      });
    }
    consoleLog("VideoRecommendListPage: visibility changed, visible: $visible, currentPage: $_currentPage");
  }

  void _onPageChanged(int page) {
    setState(() {
      _currentPage = page;
    });
    consoleLog("VideoRecommendListPage: page changed to $page");
  }

  @override
  Widget build(BuildContext context) {
    super.build(context);
    final videos = ref.watch(recommendListProvider);
    return VisibilityDetector(
      key: const Key("value"),
      onVisibilityChanged: _onVisibilityChanged,
      child: Padding(
        padding: EdgeInsets.symmetric(
          horizontal: horizontalPadding,
          vertical: horizontalPadding,
        ),
        child: PageView.builder(
          onPageChanged: _onPageChanged,
          scrollDirection: Axis.vertical,
          itemCount: videos.length,
          itemBuilder: (context, index) {
            return VideoPlayItemWidget(
              key: ValueKey(videos[index].contentId),
              item: videos[index],
              isActive: _isVisible && index == _currentPage,
            );
          },
        ),
      ),
    );
  }

  @override
  bool get wantKeepAlive => true;
}