除了flutter的小部件外，还可以使用Flame的游戏小部件吗？

Question

简而言之，由于Flame游戏本身就是一个小部件，所以我想在列小部件中添加这个小部件。当我将它添加到runApp()时，游戏就会运行，但是当在列中添加小部件时，它不会运行。为什么？

import 'package:flame/components.dart';
import 'package:flame/game.dart';
import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatefulWidget {
  const MyApp({Key? key}) : super(key: key);

  @override
  State<MyApp> createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(title: Text('Sprite examples')),
        body: Center(
          child: Column(
            mainAxisAlignment: MainAxisAlignment.center,
            children: [
              Text(
                'This a sample text!',
                style: TextStyle(fontSize: 22),
              ),
              GameWidget(game: SpriteSample())       //<========== game widget
            ],
          ),
        ),
      ),
    );
  }
}

class SpriteSample extends FlameGame {
  @override
  Future<void>? onLoad() {
    add(SpriteOne());
    return super.onLoad();
  }
}

class SpriteOne extends PositionComponent {
  final Paint _paint = Paint()..color = Colors.red;

  @override
  Future<void>? onLoad() {
    return super.onLoad();
  }

  @override
  void render(Canvas canvas) {
    canvas.drawCircle(Offset(150, 150), 25, _paint);
  }

  @override
  void update(double dt) {
    super.update(dt);
  }
}

Answer 1

您需要将它包装在一个Expanded小部件(或者给它一个大小的另一个小部件，例如SizedBox )中，否则由于无限大小的约束，GameWidget将无法布局：

class _MyAppState extends State<MyApp> {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(title: Text('Sprite examples')),
        body: Center(
          child: Column(
            mainAxisAlignment: MainAxisAlignment.center,
            children: [
              Text(
                'This a sample text!',
                style: TextStyle(fontSize: 22),
              ),
              Expanded(
                child: GameWidget(game: SpriteSample()),
              )
            ],
          ),
        ),
      ),
    );
  }
}