PiliPlus/lib/pages/dynamics_tab/view.dart

import 'dart:async';

import 'package:PiliPlus/common/constants.dart';
import 'package:PiliPlus/common/skeleton/dynamic_card.dart';
import 'package:PiliPlus/common/widgets/loading_widget/http_error.dart';
import 'package:PiliPlus/common/widgets/refresh_indicator.dart';
import 'package:PiliPlus/http/loading_state.dart';
import 'package:PiliPlus/models/common/dynamic/dynamics_type.dart';
import 'package:PiliPlus/models/common/nav_bar_config.dart';
import 'package:PiliPlus/models/dynamics/result.dart';
import 'package:PiliPlus/pages/common/common_page.dart';
import 'package:PiliPlus/pages/dynamics/controller.dart';
import 'package:PiliPlus/pages/dynamics/widgets/dynamic_panel.dart';
import 'package:PiliPlus/pages/dynamics_tab/controller.dart';
import 'package:PiliPlus/pages/main/controller.dart';
import 'package:PiliPlus/utils/global_data.dart';
import 'package:PiliPlus/utils/grid.dart';
import 'package:flutter/material.dart';
import 'package:get/get.dart';
import 'package:waterfall_flow/waterfall_flow.dart';

class DynamicsTabPage extends CommonPage {
  const DynamicsTabPage({super.key, required this.dynamicsType});

  final DynamicsTabType dynamicsType;

  @override
  State<DynamicsTabPage> createState() => _DynamicsTabPageState();

  static Widget dynSkeleton(bool dynamicsWaterfallFlow) {
    if (!dynamicsWaterfallFlow) {
      return SliverCrossAxisGroup(
        slivers: [
          const SliverFillRemaining(),
          SliverConstrainedCrossAxis(
            maxExtent: Grid.smallCardWidth * 2,
            sliver: SliverList.builder(
              itemBuilder: (context, index) {
                return const DynamicCardSkeleton();
              },
              itemCount: 10,
            ),
          ),
          const SliverFillRemaining(),
        ],
      );
    }
    return SliverGrid(
      gridDelegate: SliverGridDelegateWithExtentAndRatio(
        crossAxisSpacing: StyleString.cardSpace / 2,
        mainAxisSpacing: StyleString.cardSpace / 2,
        maxCrossAxisExtent: Grid.smallCardWidth * 2,
        childAspectRatio: StyleString.aspectRatio,
        mainAxisExtent: 50,
      ),
      delegate: SliverChildBuilderDelegate(
        (context, index) {
          return const DynamicCardSkeleton();
        },
        childCount: 10,
      ),
    );
  }
}

class _DynamicsTabPageState
    extends CommonPageState<DynamicsTabPage, DynamicsTabController>
    with AutomaticKeepAliveClientMixin {
  StreamSubscription? _listener;
  late final MainController _mainController = Get.find<MainController>();

  DynamicsController dynamicsController = Get.put(DynamicsController());
  @override
  late DynamicsTabController controller = Get.put(
    DynamicsTabController(dynamicsType: widget.dynamicsType)
      ..mid = dynamicsController.mid.value,
    tag: widget.dynamicsType.name,
  );

  @override
  bool get wantKeepAlive => true;

  @override
  void listener() {
    if (_mainController.navigationBars[0] != NavigationBarType.dynamics &&
        _mainController.selectedIndex.value == 0) {
      return;
    }
    super.listener();
  }

  @override
  void initState() {
    super.initState();
    if (widget.dynamicsType == DynamicsTabType.up) {
      _listener = dynamicsController.mid.listen((mid) {
        if (mid != -1) {
          controller
            ..mid = mid
            ..onReload();
        }
      });
    }
  }

  @override
  void dispose() {
    _listener?.cancel();
    dynamicsController.mid.close();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    super.build(context);
    return refreshIndicator(
      onRefresh: () {
        dynamicsController.queryFollowUp();
        return controller.onRefresh();
      },
      child: CustomScrollView(
        physics: const AlwaysScrollableScrollPhysics(),
        controller: controller.scrollController,
        slivers: [
          SliverPadding(
            padding: EdgeInsets.only(
              bottom: MediaQuery.paddingOf(context).bottom + 80,
            ),
            sliver: Obx(() => _buildBody(controller.loadingState.value)),
          ),
        ],
      ),
    );
  }

  Widget _buildBody(LoadingState<List<DynamicItemModel>?> loadingState) {
    return switch (loadingState) {
      Loading() => DynamicsTabPage.dynSkeleton(
        GlobalData().dynamicsWaterfallFlow,
      ),
      Success(:var response) =>
        response?.isNotEmpty == true
            ? GlobalData().dynamicsWaterfallFlow
                  ? SliverWaterfallFlow.extent(
                      maxCrossAxisExtent: Grid.smallCardWidth * 2,
                      crossAxisSpacing: StyleString.cardSpace / 2,
                      lastChildLayoutTypeBuilder: (index) {
                        if (index == response.length - 1) {
                          controller.onLoadMore();
                        }
                        return index == response.length
                            ? LastChildLayoutType.foot
                            : LastChildLayoutType.none;
                      },
                      children: [
                        for (int index = 0; index < response!.length; index++)
                          DynamicPanel(
                            item: response[index],
                            onRemove: (idStr) =>
                                controller.onRemove(index, idStr),
                            onBlock: () => controller.onBlock(index),
                          ),
                      ],
                    )
                  : SliverCrossAxisGroup(
                      slivers: [
                        const SliverFillRemaining(),
                        SliverConstrainedCrossAxis(
                          maxExtent: Grid.smallCardWidth * 2,
                          sliver: SliverList.builder(
                            itemBuilder: (context, index) {
                              if (index == response.length - 1) {
                                controller.onLoadMore();
                              }
                              final item = response[index];
                              return DynamicPanel(
                                item: item,
                                onRemove: (idStr) =>
                                    controller.onRemove(index, idStr),
                                onBlock: () => controller.onBlock(index),
                              );
                            },
                            itemCount: response!.length,
                          ),
                        ),
                        const SliverFillRemaining(),
                      ],
                    )
            : HttpError(
                onReload: controller.onReload,
              ),
      Error(:var errMsg) => HttpError(
        errMsg: errMsg,
        onReload: controller.onReload,
      ),
    };
  }
}