PiliPlus/lib/pages/video/detail/reply/view.dart

import 'package:PiliPalaX/common/widgets/refresh_indicator.dart';
import 'package:PiliPalaX/common/widgets/http_error.dart';
import 'package:PiliPalaX/http/loading_state.dart';
import 'package:PiliPalaX/pages/video/detail/reply/widgets/reply_item.dart';
import 'package:PiliPalaX/pages/video/detail/reply/widgets/reply_item_grpc.dart';
import 'package:PiliPalaX/utils/extension.dart';
import 'package:PiliPalaX/utils/global_data.dart';
import 'package:flutter/material.dart';
import 'package:flutter/rendering.dart';
import 'package:get/get.dart';
import 'package:PiliPalaX/common/skeleton/video_reply.dart';
import 'package:PiliPalaX/models/common/reply_type.dart';
import 'package:PiliPalaX/utils/feed_back.dart';
import 'package:PiliPalaX/utils/id_utils.dart';
import 'controller.dart';

class VideoReplyPanel extends StatefulWidget {
  final String? bvid;
  final int? oid;
  final int rpid;
  final String? replyLevel;
  final String heroTag;
  final Function replyReply;

  const VideoReplyPanel({
    this.bvid,
    this.oid,
    this.rpid = 0,
    this.replyLevel,
    required this.heroTag,
    required this.replyReply,
    super.key,
  });

  @override
  State<VideoReplyPanel> createState() => _VideoReplyPanelState();
}

class _VideoReplyPanelState extends State<VideoReplyPanel>
    with AutomaticKeepAliveClientMixin, TickerProviderStateMixin {
  late VideoReplyController _videoReplyController;
  late AnimationController fabAnimationCtr;

  bool _isFabVisible = true;
  String replyLevel = '1';
  late String heroTag;

  // 添加页面缓存
  @override
  bool get wantKeepAlive => true;

  @override
  void initState() {
    super.initState();
    // int oid = widget.bvid != null ? IdUtils.bv2av(widget.bvid!) : 0;
    // heroTag = Get.arguments['heroTag'];
    heroTag = widget.heroTag;
    replyLevel = widget.replyLevel ?? '1';
    if (replyLevel == '2') {
      _videoReplyController = Get.put(
          VideoReplyController(widget.oid, widget.rpid.toString(), replyLevel),
          tag: widget.rpid.toString());
    } else {
      _videoReplyController = Get.find<VideoReplyController>(tag: heroTag);
    }

    fabAnimationCtr = AnimationController(
        vsync: this, duration: const Duration(milliseconds: 100));

    fabAnimationCtr.forward();
    scrollListener();
  }

  @override
  void dispose() {
    _videoReplyController.scrollController.removeListener(() {});
    fabAnimationCtr.dispose();
    super.dispose();
  }

  void scrollListener() {
    _videoReplyController.scrollController.addListener(
      () {
        final ScrollDirection direction =
            _videoReplyController.scrollController.position.userScrollDirection;
        if (direction == ScrollDirection.forward) {
          if (mounted) {
            _showFab();
          }
        } else if (direction == ScrollDirection.reverse) {
          if (mounted) {
            _hideFab();
          }
        }
      },
    );
  }

  void _showFab() {
    if (!_isFabVisible) {
      _isFabVisible = true;
      fabAnimationCtr.forward();
    }
  }

  void _hideFab() {
    if (_isFabVisible) {
      _isFabVisible = false;
      fabAnimationCtr.reverse();
    }
  }

  @override
  Widget build(BuildContext context) {
    super.build(context);
    return refreshIndicator(
      onRefresh: () async {
        await _videoReplyController.onRefresh();
      },
      child: Stack(
        children: [
          CustomScrollView(
            controller: _videoReplyController.scrollController,
            physics: const AlwaysScrollableScrollPhysics(),
            // key: const PageStorageKey<String>('评论'),
            slivers: <Widget>[
              SliverPersistentHeader(
                pinned: false,
                floating: true,
                delegate: MySliverPersistentHeaderDelegate(
                  child: Container(
                    height: 40,
                    padding: const EdgeInsets.fromLTRB(12, 0, 6, 0),
                    color: Theme.of(context).colorScheme.surface,
                    child: Row(
                      mainAxisAlignment: MainAxisAlignment.spaceBetween,
                      children: [
                        Obx(
                          () => Text(
                            '${_videoReplyController.sortTypeLabel.value}评论',
                            style: const TextStyle(fontSize: 13),
                          ),
                        ),
                        SizedBox(
                          height: 35,
                          child: TextButton.icon(
                            onPressed: () =>
                                _videoReplyController.queryBySort(),
                            icon: const Icon(Icons.sort, size: 16),
                            label: Obx(
                              () => Text(
                                _videoReplyController.sortTypeLabel.value,
                                style: const TextStyle(fontSize: 13),
                              ),
                            ),
                          ),
                        )
                      ],
                    ),
                  ),
                ),
              ),
              Obx(() => _buildBody(_videoReplyController.loadingState.value)),
            ],
          ),
          Positioned(
            bottom: MediaQuery.of(context).padding.bottom + 14,
            right: 14,
            child: SlideTransition(
              position: Tween<Offset>(
                begin: const Offset(0, 2),
                end: const Offset(0, 0),
              ).animate(CurvedAnimation(
                parent: fabAnimationCtr,
                curve: Curves.easeInOut,
              )),
              child: FloatingActionButton(
                heroTag: null,
                onPressed: () {
                  feedBack();
                  dynamic oid = _videoReplyController.aid ??
                      IdUtils.bv2av(Get.parameters['bvid']!);
                  _videoReplyController.onReply(
                    context,
                    oid: oid,
                    replyType: ReplyType.video,
                  );
                },
                tooltip: '发表评论',
                child: const Icon(Icons.reply),
              ),
            ),
          ),
        ],
      ),
    );
  }

  Widget _buildBody(LoadingState loadingState) {
    return switch (loadingState) {
      Loading() => SliverList(
          delegate: SliverChildBuilderDelegate(
            (BuildContext context, index) {
              return const VideoReplySkeleton();
            },
            childCount: 5,
          ),
        ),
      Success() => (loadingState.response.replies as List?)?.isNotEmpty == true
          ? SliverList(
              delegate: SliverChildBuilderDelegate(
                (BuildContext context, index) {
                  double bottom = MediaQuery.of(context).padding.bottom;
                  if (index == loadingState.response.replies.length) {
                    _videoReplyController.onLoadMore();
                    return Container(
                      alignment: Alignment.center,
                      padding: EdgeInsets.only(bottom: bottom),
                      height: bottom + 100,
                      child: Text(
                        _videoReplyController.isEnd.not
                            ? '加载中...'
                            : loadingState.response.replies.isEmpty
                                ? '还没有评论'
                                : '没有更多了',
                        style: TextStyle(
                          fontSize: 12,
                          color: Theme.of(context).colorScheme.outline,
                        ),
                      ),
                    );
                  } else {
                    return GlobalData().grpcReply
                        ? ReplyItemGrpc(
                            replyItem: loadingState.response.replies[index],
                            showReplyRow: true,
                            replyLevel: replyLevel,
                            replyReply: widget.replyReply,
                            replyType: ReplyType.video,
                            onReply: () {
                              _videoReplyController.onReply(
                                context,
                                replyItem: loadingState.response.replies[index],
                                index: index,
                              );
                            },
                            onDelete: _videoReplyController.onMDelete,
                            isTop: _videoReplyController.hasUpTop && index == 0,
                            upMid: loadingState.response.subjectControl.upMid,
                            getTag: () => heroTag,
                          )
                        : ReplyItem(
                            replyItem: loadingState.response.replies[index],
                            showReplyRow: true,
                            replyLevel: replyLevel,
                            replyReply: widget.replyReply,
                            replyType: ReplyType.video,
                            onReply: () {
                              _videoReplyController.onReply(
                                context,
                                replyItem: loadingState.response.replies[index],
                                index: index,
                              );
                            },
                            onDelete: _videoReplyController.onMDelete,
                            // isTop: _videoReplyController.hasUpTop && index == 0,
                            // upMid: loadingState.response.subjectControl.upMid,
                            // getTag: () => heroTag,
                          );
                  }
                },
                childCount: loadingState.response.replies.length + 1,
              ),
            )
          : HttpError(
              errMsg: '还没有评论',
              callback: _videoReplyController.onReload,
            ),
      Error() => HttpError(
          errMsg:
              '如无法加载评论：\n1.关闭代理\n2.设置中关闭使用gRPC加载评论\n\n${loadingState.errMsg}',
          callback: _videoReplyController.onReload,
        ),
      LoadingState() => throw UnimplementedError(),
    };
  }
}

class MySliverPersistentHeaderDelegate extends SliverPersistentHeaderDelegate {
  MySliverPersistentHeaderDelegate({required this.child});
  final double _minExtent = 45;
  final double _maxExtent = 45;
  final Widget child;

  @override
  Widget build(
      BuildContext context, double shrinkOffset, bool overlapsContent) {
    //创建child子组件
    //shrinkOffset：child偏移值minExtent~maxExtent
    //overlapsContent：SliverPersistentHeader覆盖其他子组件返回true，否则返回false
    return child;
  }

  //SliverPersistentHeader最大高度
  @override
  double get maxExtent => _maxExtent;

  //SliverPersistentHeader最小高度
  @override
  double get minExtent => _minExtent;

  @override
  bool shouldRebuild(covariant MySliverPersistentHeaderDelegate oldDelegate) {
    return true;
  }
}