puzzleweave/lib/homepage/home_board.dart

import 'dart:typed_data';

import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:image_puzzle/config/device.dart';
import 'package:image_puzzle/models/download.dart';
import 'package:image_puzzle/models/items.dart';
import 'package:logging/logging.dart';
import 'dart:ui' as ui;

final Logger _log = Logger('home_board');

enum HomeBoardStatus { loading, shuffle, playing, done, unlocking }

class HomeBoard {
  final Device device;

  // 原合集图
  ui.Image? image;

  // 纸牌背面图
  late ui.Image cardImage;

  // board 的canvas绘制区域尺寸
  final double canvasWidth;
  final double canvasHeight;

  /// 一张合集分为几宫格，固定5x5
  final int rows = 5;
  final int cols = 5;

  // 每个piece的逻辑尺寸
  double get pieceLogicalWidth => canvasWidth / cols;
  double get pieceLogicalHeight => canvasHeight / rows;

  ValueNotifier boardNotifier = ValueNotifier(1);

  HomeBoardStatus status = HomeBoardStatus.loading;

  ListItem? _currentCollectionItem;
  ListItem? get currentCollectionItem => _currentCollectionItem;
  set currentCollectionItem(ListItem? item) {
    if (item == null) return;
    if (_currentCollectionItem == null || _currentCollectionItem!.id != item.id) {
      _currentCollectionItem = item;
      _loadImage();
    }
  }

  ValueNotifier isReadyNotifier = ValueNotifier(false);

  // 用于存储合集解锁动画相关信息
  Offset _unlockTargetOffset = Offset.zero;
  double _unlockTargetScale = 1.0;

  Offset get unlockTargetOffset => _unlockTargetOffset;
  double get unlockTargetScale => _unlockTargetScale;

  void setUnlockAnimationTarget({required Offset targetOffset, required double targetScale}) {
    _unlockTargetOffset = targetOffset;
    _unlockTargetScale = targetScale;
  }

  HomeBoard({required this.canvasWidth, required this.canvasHeight, required this.device}) {
    _loadCardImage();
  }

  void invalidate() {
    boardNotifier.value++;
  }

  // 加载合集图
  void _loadImage() async {
    double dpr = device.devicePixelRatio;

    ItemLoader itemLoader = ItemLoader.load(currentCollectionItem!);
    image = await itemLoader.getImageBySize((canvasWidth * dpr).round(), (canvasHeight * dpr).round());

    isReadyNotifier.value = true;
    invalidate();
  }

  // 加载卡片图
  void _loadCardImage() async {
    double dpr = device.devicePixelRatio;
    // 加载扑克背面图片，用于制作发牌动画
    final Size bestCardImageSize = Size(pieceLogicalWidth * dpr, pieceLogicalHeight * dpr);
    final ByteData cardData = await rootBundle.load('assets/images/backcard_green.png');
    final ui.Codec cardCodec = await ui.instantiateImageCodec(
      cardData.buffer.asUint8List(),
      targetWidth: bestCardImageSize.width.round(),
      targetHeight: bestCardImageSize.height.round(),
    );
    final ui.FrameInfo cardFrameInfo = await cardCodec.getNextFrame();
    cardImage = cardFrameInfo.image;

    invalidate();
  }
}