Dart中的字符串文字类型模拟 | Dart中的字符串文字类型模拟

本文介绍了Dart中的字符串文字类型模拟的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我知道在Dart中没有像这样的字符串文字类型:

I know that in Dart there's no string literal types like:

interface IButtonProps {
 readonly variant: 'primary' | 'secondary'
 readonly size: 'small' | 'regular' | 'big' | 'a little bigger than usually'
}

const Button:FC<IButtonProps> = ({variant, size}) => {
 // ...
}

但是，如果我真的希望该按钮仅接受主要/次要变体，并在编写库时向我/我的团队/社区建议变体，那我会有什么选择呢?

But what are my choises if i really want that button to accept only primary/secondary variants and suggest variants to me/my team/the community if i'm writing a library ?

我知道我可以声明道具，但是在编译时不会有任何建议仅在编辑器中出现.那么，我能做些什么来获得该功能?类似于创建ButtonVariants类并仅接受其字段/创建枚举/列表/设置/任何东西，或者我不知道...

I know i can assert props but there would not be any suggestions in editor only error at compile time.So is there anything i can do to get that functionality ? Something like creating a ButtonVariants class and accepting only its fields / creating enum / list / set / whatever or i dont know...

我真的需要任何形式的严格输入，而不是像PrimaryButton SecondaryButton SmallPrimaryButton这样的小部件创建一个地狱.

I really need that strict typing in any form and not to create one hell of a widgets like PrimaryButton SecondaryButton SmallPrimaryButton...

请注意，这个愚蠢的小学/中学只是一个例子.

Note that this stupid primary/secondary is just an example.

推荐答案

您可以像这样使用枚举器

You can just use enumarators like this

enum ButtonType { primary, secondary }
enum ButtonSize { small, regular, big }

class Button {
  final ButtonType type;
  final ButtonSize size;

  AbstractButton(this.type, this.size);
}

如果您使用的是Flutter，请从小部件类中扩展您的类

Extend your class from widget class if you're using flutter

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