PiliPlus/lib/pages/fav/topic/view.dart

import 'package:PiliPlus/common/constants.dart';
import 'package:PiliPlus/common/widgets/dialog/dialog.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/user/fav_topic/topic_item.dart';
import 'package:PiliPlus/pages/fav/topic/controller.dart';
import 'package:PiliPlus/utils/grid.dart';
import 'package:flutter/material.dart';
import 'package:get/get.dart';

class FavTopicPage extends StatefulWidget {
  const FavTopicPage({super.key});

  @override
  State<FavTopicPage> createState() => _FavTopicPageState();
}

class _FavTopicPageState extends State<FavTopicPage>
    with AutomaticKeepAliveClientMixin {
  final FavTopicController _controller = Get.put(FavTopicController());

  @override
  bool get wantKeepAlive => true;

  @override
  Widget build(BuildContext context) {
    super.build(context);
    final ThemeData theme = Theme.of(context);
    return refreshIndicator(
      onRefresh: _controller.onRefresh,
      child: CustomScrollView(
        controller: _controller.scrollController,
        physics: const AlwaysScrollableScrollPhysics(),
        slivers: [
          SliverPadding(
            padding: EdgeInsets.only(
              left: StyleString.safeSpace,
              right: StyleString.safeSpace,
              top: StyleString.safeSpace,
              bottom: MediaQuery.paddingOf(context).bottom + 80,
            ),
            sliver:
                Obx(() => _buildBody(theme, _controller.loadingState.value)),
          ),
        ],
      ),
    );
  }

  Widget _buildBody(
      ThemeData theme, LoadingState<List<FavTopicModel>?> loadingState) {
    return switch (loadingState) {
      Loading() => const SliverToBoxAdapter(child: LinearProgressIndicator()),
      Success(:var response) => response?.isNotEmpty == true
          ? SliverGrid(
              gridDelegate: SliverGridDelegateWithMaxCrossAxisExtent(
                mainAxisSpacing: 12,
                crossAxisSpacing: 12,
                maxCrossAxisExtent: Grid.smallCardWidth,
                mainAxisExtent: MediaQuery.textScalerOf(context).scale(30),
              ),
              delegate: SliverChildBuilderDelegate(
                (context, index) {
                  if (index == response.length - 1) {
                    _controller.onLoadMore();
                  }
                  final item = response[index];
                  return Material(
                    color: theme.colorScheme.onInverseSurface,
                    borderRadius: const BorderRadius.all(Radius.circular(6)),
                    child: InkWell(
                      onTap: () => Get.toNamed(
                        '/dynTopic',
                        parameters: {
                          'id': item.id!.toString(),
                          'name': item.name!,
                        },
                      ),
                      onLongPress: () => showConfirmDialog(
                        context: context,
                        title: '确定取消收藏？',
                        onConfirm: () {
                          _controller.onRemove(index, item.id);
                        },
                      ),
                      borderRadius: const BorderRadius.all(Radius.circular(6)),
                      child: Container(
                        alignment: Alignment.centerLeft,
                        padding: const EdgeInsets.symmetric(
                            horizontal: 11, vertical: 5),
                        child: Text(
                          '# ${item.name}',
                          maxLines: 1,
                          overflow: TextOverflow.ellipsis,
                          style: TextStyle(
                            fontSize: 14,
                            color: theme.colorScheme.onSurfaceVariant,
                          ),
                        ),
                      ),
                    ),
                  );
                },
                childCount: response!.length,
              ),
            )
          : HttpError(onReload: _controller.onReload),
      Error(:var errMsg) => HttpError(
          errMsg: errMsg,
          onReload: _controller.onReload,
        ),
    };
  }
}