javascript - 如何扩展或合并 Styled Components 主题

Question

我有一个基于 Styled Components 的组件库，它有自己的一组主题设置，在大多数情况下永远不需要覆盖。我正在将这个组件库拉到另一个元素中，该元素也使用 Style Components 并有自己的主题。我如何从组件库和这个元素中导入组件，并确保它们中的每一个都只提供来自其相应 repo 的主题值？我不想覆盖我的组件库主题，我想管理 2 个单独的主题，以便我的组件库可以访问默认主题，而这个其他元素可以为其自己的组件定义一个单独的主题对象

例子:独立元素

const theme = {
  colors: {
    error: '#f23f3f',
  }
}

import { SeparateProjectThemeProvider } from 'separate-proj';

class App extends React.Component {
 render () {
  return (
   <SeparateProjectThemeProvider theme={theme}>
     <h1>Hello</h1>
   </SeparateProjectThemeProvider>
  )
 }
}

组件库

const theme = {
  colors: {
    brand: '#3bbdca',
  }
}

import { ThemeProvider } from "styled-components";

import defaultTheme from "./theme-settings";

const mergeThemes = (theme1, theme2) => {
  const mergedTheme = { ...theme1, ...theme2 };
  return mergedTheme;
};

const CustomThemeProvider = props => {
  const customTheme = {
    custom: Object.assign({}, defaultTheme)
  };

  return (
    <ThemeProvider theme={mergeThemes(customTheme, props.theme)}>
        {props.children}
    </ThemeProvider>
  );
};

export default CustomThemeProvider;

Answer 1

下面的代码将演示几个选项——使用适当的主题提供程序 (WrappedTitle) 预先包装每个组件库组件，或者在您使用它们时包装它们(“Hello Component World!”部分)。

// Sample component-lib/index.js
import React from 'react';
import styled from "styled-components";
import {ThemeProvider} from "styled-components";

const theme = {
  titleColor: "green"
};
export const CompLibThemeProvider = props => {
  const customTheme = Object.assign({}, theme, props.theme);
  return (
    <ThemeProvider theme={customTheme}>
        {props.children}
    </ThemeProvider>
  );
};

export const Title = styled.h1`
  font-size: 1.5em;
  text-align: center;
  color: ${props => props.theme.titleColor};
`;
export const WrappedTitle = (props) => {
  return (<CompLibThemeProvider><Title {...props}/></CompLibThemeProvider>);
};

下面是一些示例元素代码:

// App.js
import React from 'react';
import styled from 'styled-components';
import {Title, CompLibThemeProvider, WrappedTitle} from 'component-lib';
import {ThemeProvider} from "styled-components";

const theme = {
  titleColor: "red"
};

export const BigTitle = styled.h1`
  font-size: 5em;
  text-align: center;
  color: ${props => props.theme.titleColor};
`;

const ProjectThemeProvider = props => {

  return (
    <ThemeProvider theme={Object.assign({}, theme, props.theme)}>
        {props.children}
    </ThemeProvider>
  );
};
const App = () => {
  return (
    <>
    <ProjectThemeProvider>
      <>
        <BigTitle>Hello Big World!</BigTitle>
        <WrappedTitle>Hello Pre-wrapped World!</WrappedTitle>
      </>
    </ProjectThemeProvider>
    <CompLibThemeProvider><Title>Hello Component World!</Title></CompLibThemeProvider>
    </>
  );
}

export default App;