Flutter插件styx的安装及使用方法
Flutter插件styx的安装及使用方法
关于Styx
Styx 是一个简单的但健壮的实体组件系统。它基于 rxdart 包来实现响应性,取代了 ECS 中的 “S”。
Flutter插件styx的安装
在 pubspec.yaml
文件中添加 Styx:
dependencies:
styx: ^2.2.0
在需要用到 Styx 的文件中导入:
import 'package:styx/styx.dart';
文档
- ✅ 创建包含代码示例的文档。
- ❌ 创建用于实际场景的示例应用。
- ❌ 实际上有文档网站 🙃
示例代码
以下是使用 Styx 插件的完整示例代码:
import 'package:flutter/material.dart';
import 'package:styx/styx.dart';
// 创建一个实体系统
final system = EntitySystem<String>();
void main() {
// 忽略:未使用的局部变量
var entity = system.create();
entity += Counter(0); // 添加计数器组件
entity += Name('Flutter'); // 添加名称组件
runApp(const Entry());
}
class Entry extends StatelessWidget {
const Entry({Key? key}) : super(key: key);
[@override](/user/override)
Widget build(BuildContext context) {
return const MaterialApp(
debugShowCheckedModeBanner: false,
home: Home(),
);
}
}
class Home extends StatelessWidget {
const Home({Key? key}) : super(key: key);
// 匹配具有Counter组件的所有实体
final EntityMatcher counterMatcher = const EntityMatcher(any: {Counter});
// 匹配具有Name组件的所有实体
final EntityMatcher personMatcher = const EntityMatcher(any: {Name});
[@override](/user/override)
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(title: const Text('Counter Example')),
body: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: [
// 显示当前计数器的值
StreamBuilder<List<Entity>>(
stream: system.entities.stream,
builder: (context, snapshot) {
if (snapshot.hasData) {
final counters = snapshot.data!.where(counterMatcher.matches).toList();
if (counters.isNotEmpty) {
final counter = counters.first;
return StreamBuilder<int>(
stream: counter.get<Counter>().value.stream,
builder: (context, snapshot) {
if (snapshot.hasData) {
return Text('Counter: ${counter.get<Counter>().getValue()}');
} else {
return const Text('Loading...');
}
},
);
}
return const SizedBox.shrink();
}
return const SizedBox.shrink();
},
),
// 显示计数器和名称输入框
StreamBuilder<List<Entity>>(
stream: system.entities.stream,
builder: (context, snapshot) {
if (snapshot.hasData) {
final person = snapshot.data!.firstWhere(personMatcher.matches);
final counter = snapshot.data!.firstWhere(counterMatcher.matches);
return Column(
children: [
StreamBuilder(
stream: counter.get<Counter>().value.stream,
builder: (context, snapshot) {
if (snapshot.hasData) {
return Text('Counter: ${counter.get<Counter>().getValue()}');
} else {
return const Text('Loading...');
}
},
),
TextFormField(
initialValue: person.get<Name>().getValue(),
onChanged: (value) => person.get<Name>().setValue(value),
decoration: const InputDecoration(
labelText: 'Name',
),
),
],
);
}
return const SizedBox.shrink();
},
),
],
),
floatingActionButton: StreamBuilder<List<Entity>>(
stream: system.entities.stream,
builder: (context, snapshot) {
if (snapshot.hasData) {
final counter = snapshot.data!.firstWhere(counterMatcher.matches);
return FloatingActionButton(
onPressed: counter.get<Counter>().increment,
child: const Icon(Icons.add),
);
}
return const SizedBox.shrink();
},
),
);
}
}
// 计数器组件类
class Counter extends Component {
Counter(int initial) {
value.add(initial);
}
final value = 0.bs;
[@override](/user/override)
void onRemoved() {
value.close();
}
void increment() {
value.add(getValue() + 1);
}
void decrement() {
value.add(getValue() - 1);
}
int getValue() {
return value.value;
}
}
// 名称组件类
class Name extends Component {
Name(String initial) {
value.add(initial);
}
final value = ''.bs;
[@override](/user/override)
void onRemoved() {
value.close();
}
void setValue(String name) {
value.add(name);
}
String getValue() {
return value.value;
}
}
更多关于Flutter插件styx的安装及使用方法的实战教程也可以访问 https://www.itying.com/category-92-b0.html