PiliPlus/lib/pages/hot/view.dart

import 'dart:async';

import 'package:PiliPalaX/http/loading_state.dart';
import 'package:flutter/material.dart';
import 'package:flutter/rendering.dart';
import 'package:get/get.dart';
import 'package:PiliPalaX/common/constants.dart';
import 'package:PiliPalaX/common/widgets/animated_dialog.dart';
import 'package:PiliPalaX/common/skeleton/video_card_h.dart';
import 'package:PiliPalaX/common/widgets/http_error.dart';
import 'package:PiliPalaX/common/widgets/video_card_h.dart';
import 'package:PiliPalaX/pages/home/index.dart';
import 'package:PiliPalaX/pages/hot/controller.dart';
import 'package:PiliPalaX/pages/main/index.dart';

import '../../utils/grid.dart';

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

  @override
  State<HotPage> createState() => _HotPageState();
}

class _HotPageState extends State<HotPage> with AutomaticKeepAliveClientMixin {
  final HotController _hotController = Get.put(HotController());

  @override
  bool get wantKeepAlive => true;

  @override
  void initState() {
    super.initState();
    StreamController<bool> mainStream =
        Get.find<MainController>().bottomBarStream;
    StreamController<bool> searchBarStream =
        Get.find<HomeController>().searchBarStream;
    _hotController.scrollController.addListener(
      () {
        if (_hotController.scrollController.position.pixels >=
            _hotController.scrollController.position.maxScrollExtent - 200) {
          _hotController.onLoadMore();
        }

        final ScrollDirection direction =
            _hotController.scrollController.position.userScrollDirection;
        if (direction == ScrollDirection.forward) {
          mainStream.add(true);
          searchBarStream.add(true);
        } else if (direction == ScrollDirection.reverse) {
          mainStream.add(false);
          searchBarStream.add(false);
        }
      },
    );
  }

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

  @override
  Widget build(BuildContext context) {
    super.build(context);
    return RefreshIndicator(
      onRefresh: () async {
        return await _hotController.onRefresh();
      },
      child: CustomScrollView(
        physics: const AlwaysScrollableScrollPhysics(),
        controller: _hotController.scrollController,
        slivers: [
          SliverPadding(
            // 单列布局 EdgeInsets.zero
            padding: EdgeInsets.fromLTRB(
              StyleString.safeSpace,
              StyleString.safeSpace - 5,
              StyleString.safeSpace,
              MediaQuery.of(context).padding.bottom + 10,
            ),
            sliver: Obx(
              () => _hotController.loadingState.value is Loading
                  ? _buildSkeleton()
                  : _hotController.loadingState.value is Success
                      ? _buildBody(_hotController.loadingState.value as Success)
                      : HttpError(
                          errMsg: _hotController.loadingState.value is Error
                              ? (_hotController.loadingState.value as Error)
                                  .errMsg
                              : '没有相关数据',
                          fn: () {
                            _hotController.loadingState.value =
                                LoadingState.loading();
                            _hotController.onRefresh();
                          }),
            ),
          ),
        ],
      ),
    );
  }

  OverlayEntry _createPopupDialog(videoItem) {
    return OverlayEntry(
      builder: (context) => AnimatedDialog(
        closeFn: _hotController.removePopupDialog,
        videoItem: videoItem,
      ),
    );
  }

  Widget _buildSkeleton() {
    return SliverGrid(
      gridDelegate: SliverGridDelegateWithMaxCrossAxisExtent(
        mainAxisSpacing: StyleString.cardSpace,
        crossAxisSpacing: StyleString.cardSpace,
        maxCrossAxisExtent: Grid.maxRowWidth * 2,
        childAspectRatio: StyleString.aspectRatio * 2.4,
      ),
      delegate: SliverChildBuilderDelegate(
        (context, index) {
          return const VideoCardHSkeleton();
        },
        childCount: 10,
      ),
    );
  }

  Widget _buildBody(Success loadingState) {
    return SliverGrid(
      gridDelegate: SliverGridDelegateWithExtentAndRatio(
        mainAxisSpacing: StyleString.safeSpace,
        crossAxisSpacing: StyleString.safeSpace,
        maxCrossAxisExtent: Grid.maxRowWidth * 2,
        childAspectRatio: StyleString.aspectRatio * 2.4,
        mainAxisExtent: 0,
      ),
      delegate: SliverChildBuilderDelegate(
        (context, index) {
          return VideoCardH(
            videoItem: loadingState.response[index],
            showPubdate: true,
            longPress: () {
              _hotController.popupDialog
                  .add(_createPopupDialog(loadingState.response[index]));
              Overlay.of(context).insert(_hotController.popupDialog.last!);
            },
            longPressEnd: _hotController.removePopupDialog,
          );
        },
        childCount: loadingState.response.length,
      ),
    );
  }
}