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March 29, 2017 03:22
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Another theme-able solution for react reusable components.
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/* | |
* Usage: | |
* | |
* As a decorator: | |
* | |
* import defaultTheme from './style.scss'; | |
* | |
* @themr(defaultTheme) | |
* class Comp extends React.Component { ... } | |
* | |
* Or as a factory: | |
* | |
* const stateless = (props) => { ... } | |
* | |
* const Comp = themrFactory(stateless, defaultTheme) | |
* | |
* Then: | |
* import localStyle from './app.scss'; | |
* | |
* class App extends React.Component { | |
* render() { | |
* return <Comp theme={localStyle} />; | |
* } | |
* } | |
*/ | |
import classnames from 'classnames'; | |
const assignTheme = (props, localTheme) => { | |
const { theme } = props; | |
// don't modify default one | |
if (theme === localTheme) return props; | |
Object.keys(localTheme).forEach((className) => { | |
const custom = theme[className]; | |
const local = localTheme[className]; | |
// in case of sharing same theme object across components | |
if (custom && custom.includes(local)) return; | |
theme[className] = classnames(local, custom); | |
}); | |
return props; | |
}; | |
const wrapProps = (Raw, localTheme) => (Themed) => { | |
/* eslint-disable no-param-reassign */ | |
Object.keys(Raw).forEach((prop) => { | |
Themed[prop] = Raw[prop]; | |
}); | |
if (!Themed.defaultProps) { | |
Themed.defaultProps = {}; | |
} | |
Themed.displayName = Raw.displayName || Raw.name; | |
Themed.defaultProps.theme = localTheme; | |
return Themed; | |
}; | |
export const themr = (localTheme = {}) => (Raw) => | |
@wrapProps(Raw, localTheme) | |
class Themed extends Raw { | |
constructor(initialProps) { | |
assignTheme(initialProps, localTheme); | |
super(initialProps); | |
} | |
componentWillReceiveProps(nextProps) { | |
assignTheme(nextProps, localTheme); | |
if (super.componentWillReceiveProps) { | |
super.componentWillReceiveProps(nextProps); | |
} | |
} | |
}; | |
export const themrFactory = (rawFactory, localTheme) => { | |
function stateless(props) { | |
assignTheme(props, localTheme); | |
return rawFactory(props); | |
} | |
return wrapProps(rawFactory, localTheme)(stateless); | |
}; |
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