puzzleweave/lib/collection/collection_screen.dart

import 'dart:async';

import 'package:flutter/material.dart';
import 'package:image_puzzle/audio/audio_controller.dart';
import 'package:image_puzzle/collection/grid_item.dart';
import 'package:image_puzzle/config/device.dart';
import 'package:image_puzzle/models/cached_request.dart';
import 'package:image_puzzle/models/data.dart';
import 'package:image_puzzle/models/items.dart';
import 'package:logging/logging.dart';
import 'package:lottie/lottie.dart';
import 'package:provider/provider.dart';

final Logger _log = Logger('collection_screen');

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

  @override
  State<StatefulWidget> createState() => _CollectionScreen();

  static PageRouteBuilder buildRoute() {
    return PageRouteBuilder(
      pageBuilder: (context, animation, secondaryAnimation) {
        return CollectionScreen();
      },
      transitionsBuilder: (context, animation, secondaryAnimation, child) {
        // return FadeTransition(opacity: animation, child: child);
        return SlideTransition(
          position: Tween(begin: const Offset(1, 0), end: Offset.zero).animate(animation),
          child: child,
        );
      },
    );
  }
}

class _CollectionScreen extends State<CollectionScreen> {
  late AudioController audio;
  late Data data;
  List<ListItem>? collection;
  late CachedRequest collectionCachedRequest;
  late StreamSubscription? collectionSubscription;

  @override
  void initState() {
    super.initState();

    audio = context.read<AudioController>();
    data = context.read<Data>();
    collectionCachedRequest = data.collection;
    // 主动获取缓存数据（关键）
    final collectionCachedData = collectionCachedRequest.cachedData;
    if (collectionCachedData != null) {
      _onCollectionDataUpdate(collectionCachedData);
    }
    collectionSubscription = collectionCachedRequest.stream.listen(_onCollectionDataUpdate, onError: _onCollectionDataError);
  }

  @override
  void dispose() {
    collectionSubscription?.cancel();

    super.dispose();
  }

  _onCollectionDataUpdate(data) async {
    _log.info('_onCollectionDataUpdate.... ');
    if (data != null) {
      collection = data as List<ListItem>;
      setState(() {});
    }
  }

  _onCollectionDataError(error) {
    _log.info('_onCollectionDataError.... $error');
  }

  Future<void> refresh() async {
    _log.info('refresh...');
    await collectionCachedRequest.refresh();
  }

  @override
  Widget build(BuildContext context) {
    final device = context.read<Device>();
    final isTablet = device.isTablet;
    return Scaffold(
      appBar: AppBar(
        backgroundColor: Colors.white,
        elevation: 1,
        centerTitle: true,
        leading: IconButton(
          onPressed: () {
            audio.playSfx(SfxType.tap);
            Navigator.pop(context);
          },
          icon: const Icon(Icons.arrow_back_outlined, color: Colors.black54),
        ),
        title: const Text(
          '收藏',
          style: TextStyle(color: Colors.black54, fontFamily: 'Arial Black', fontWeight: FontWeight.bold, fontSize: 24),
        ),
      ),
      body: collection == null
          ? scrollableDummy
          : RefreshIndicator(
              onRefresh: refresh,
              child: CustomScrollView(
                slivers: <Widget>[
                  // header
                  SliverPadding(
                    sliver: SliverGrid(
                      gridDelegate: SliverGridDelegateWithMaxCrossAxisExtent(maxCrossAxisExtent: isTablet ? 300 : 210, childAspectRatio: 2 / 3),
                      delegate: SliverChildBuilderDelegate((BuildContext context, int index) {
                        return _buildItem(context, index);
                      }, childCount: collection!.length),
                    ),
                    padding: const EdgeInsets.only(left: 10.0, right: 10.0),
                  ),
                ],
              ),
            ),
    );
  }

  Widget get scrollableDummy => LayoutBuilder(
    builder: (p0, p1) {
      return SingleChildScrollView(
        physics: const AlwaysScrollableScrollPhysics(),
        child: SizedBox(
          height: p1.maxHeight,
          child: Center(
            child: ListView(
              shrinkWrap: true,
              children: [
                Lottie.asset('assets/lottie/loading.json', height: 100),
                const Center(child: Text("loading...")),
              ],
            ),
          ),
        ),
      );
    },
  );

  Widget _buildItem(context, index) {
    ListItem item = collection![index];
    final bool isLocked = index >= data.currentCollectionIndex; // 假设 currentCollectionIndex 之前是解锁的
    return Padding(
      padding: const EdgeInsets.all(10.0),
      child: GridItem(item: item, lock: false, index: index),
    );
  }
}