PiliPlus/lib/pages/common/common_search_page.dart

import 'package:PiliPlus/common/widgets/http_error.dart';
import 'package:PiliPlus/http/loading_state.dart';
import 'package:PiliPlus/pages/common/common_search_controller.dart';
import 'package:flutter/material.dart';
import 'package:get/get.dart';

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

abstract class CommonSearchPageState<S extends CommonSearchPage, R, T>
    extends State<S> {
  CommonSearchController<R, T> get controller;

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      resizeToAvoidBottomInset: false,
      appBar: AppBar(
        actions: [
          IconButton(
            tooltip: '搜索',
            onPressed: controller.onRefresh,
            icon: const Icon(Icons.search_outlined, size: 22),
          ),
          const SizedBox(width: 10)
        ],
        title: TextField(
          autofocus: true,
          focusNode: controller.focusNode,
          controller: controller.editController,
          textInputAction: TextInputAction.search,
          textAlignVertical: TextAlignVertical.center,
          decoration: InputDecoration(
            hintText: '搜索',
            border: InputBorder.none,
            suffixIcon: IconButton(
              tooltip: '清空',
              icon: const Icon(Icons.clear, size: 22),
              onPressed: () {
                controller
                  ..loadingState.value = LoadingState.loading()
                  ..onClear()
                  ..focusNode.requestFocus();
              },
            ),
          ),
          onSubmitted: (value) => controller.onRefresh(),
        ),
      ),
      body: SafeArea(
        top: false,
        bottom: false,
        child: CustomScrollView(
          physics: const AlwaysScrollableScrollPhysics(),
          controller: controller.scrollController,
          slivers: [
            Obx(() => _buildBody(controller.loadingState.value)),
          ],
        ),
      ),
    );
  }

  Widget _buildBody(LoadingState<List<T>?> loadingState) {
    return switch (loadingState) {
      Loading() => HttpError(),
      Success() => loadingState.response?.isNotEmpty == true
          ? buildList(loadingState.response!)
          : HttpError(
              onReload: controller.onReload,
            ),
      Error() => HttpError(
          errMsg: loadingState.errMsg,
          onReload: controller.onReload,
        ),
      _ => throw UnimplementedError(),
    };
  }

  Widget buildList(List<T> list);
}