@gfpacheco/theming
v2.0.0
Unified CSSinJS theming solution for React
1/weekUpdated 3 years agoMIT
Published by Vladimir Starkov
npm install @gfpacheco/themingtheming
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> Unified CSSinJS theming solution for React
* ThemeProvider allows you to pass, update, merge and augment theme through context down react tree.
* withTheme allows you to receive theme and its updates in your components as a theme prop.
* createTheming allows you to integrate theming into your CSSinJS library with custom channel (if you need custom one).
* _Advanced usage:_ themeListener allows you to add theming support in your components.
See Motivation for details.
Table of Contents
* Install
* Usage
* Playground demo
* Motivation
* API
* channel
* ThemeProvider
* withTheme
* themeListener
* createTheming
* Credits
* License
Install
npm install --save theming
# or
yarn add theming
Usage
In your components
Note: this component i will use later to show what theme you will get
``jsx
import React from 'react';
import { withTheme } from 'theming';
const DemoBox = props => {
console.log(props.theme);
return (
}
export default withTheme(DemoBox);
`
In your app
`jsx
import React from 'react';
import { ThemeProvider } from 'theming';
import DemoBox from './components/DemoBox'
const theme = {
color: 'black',
background: 'white',
};
const App = () => (
)
export default App;
`
Playground demo
Be our guest, play with theming in this webpackbin:
https://www.webpackbin.com/bins/-Km8TglfWP84oYhDquT1
Motivation
These components are enabling seamless theming for your react applications. And as far as you dont want to pass theme object to each and every component. Thats why you want to use context. But as far context feature is _experimental API and it is likely to break in future releases of React_ you don't want to use it directly. Here theming comes to play.
> If you insist on using context despite these warnings, try to isolate your use of context to a small area and avoid using the context API directly when possible so that it's easier to upgrade when the API changes.
>
> If you insist on using context despite these warnings, try to isolate your use of context to a small area and avoid using the context API directly when possible so that it's easier to upgrade when the API changes.
> — Context, React documentation
Regarding _isolation your use of context to a small area_ and _small areas__ in particular our very own react prophet Dan Abramov have a thing to say:
> Should I use React unstable “context” feature?
> ![![context application areas]](https://pbs.twimg.com/media/CmeGPNcVYAAM7TR.jpg)
> — Dan Abramov @dan_abramov on Twitter
So you are fine to use context for theming. theming package provides everything you need to do that:ThemeProvider
* allows you to pass and update theme through context down react tree.withTheme
* allows you to receive theme and its updates in your components as a theme prop.createTheming
* allows you to integrate theming into your CSSinJS library with custom channel (if you need custom one).
API
$3
Theming package by default uses this string as a name of the field in context (hence contextTypes and childContextTypes). If you want to build your own components on top of theming, it might be a good idea to not rely on hard coded value, but instead import this value from the package.
`js
import { channel } from 'theming';
console.log(channel); '__THEMING__';
`
$3
React High-Order component, which passes theme object down the react tree by context.
`jsx
import { ThemeProvider } from 'theming';
const theme = { /…/ };
`
#### props
##### props.theme
Required
Type: Object, Function
If its Object and its root ThemeProvider then its intact and being passed down the react tree.
`jsx
const theme = { themed: true };
`
If its Object and its nested ThemeProvider then its being merged with theme from parent ThemeProvider and passed down to the react tree.
`jsx
const theme = { themed: true };
const patch = { merged: true };
`
If its Function and its nested ThemeProvider then its being applied to the theme from parent ThemeProvider. if result is an Object it will be passed down to the react tree, throws otherwise.
`jsx
const theme = { themed: true };
const augment = outerTheme =>
Object.assign({}, outerTheme, { augmented: true });
`
##### props.children
Required
Type: PropTypes.element
ThemeProvider uses React.Children.only in render, which returns the only child in children. Throws otherwise.
$3
React High-Order component, which maps context to theme prop.
#### component
Required
Type: PropTypes.element
You need to have ThemeProvider with a theme somewhere upper the react tree, after that wrap your component in withTheme and your component will get theme as a prop. withTheme will handle initial theme object as well as theme updates.
PS. It doesnt break if you have PureComponent somewhere in between your ThemeProvider and withTheme (i have tests for that).
Usage with Component:
`jsx
import React from 'react';
import { withTheme } from 'theming';
const DemoBox = props => {
console.log(props.theme);
return (
}
export default withTheme(DemoBox);
`
In the app:
`jsx
import React from 'react';
import { ThemeProvider } from 'theming';
import DemoBox from './components/DemoBox'
const theme = {
color: 'black',
background: 'white',
};
const App = () => (
)
export default App;
`
$3
Advanced helper to hook theming in any Component.
`js
import { themeListener } from 'theming';
function CustomWithTheme(Component) {
return class CustomWithTheme extends React.Component {
static contextTypes = themeListener.contextTypes;
constructor(props, context) {
super(props, context);
this.state = { theme: themeListener.initial(context) };
this.setTheme = theme => this.setState({ theme });
}
componentDidMount() {
this.unsubscribe = themeListener.subscribe(this.context, this.setTheme);
}
componentWillUnmount() {
if (typeof this.unsubscribe === 'function') {
this.unsubscribe();
}
}
render() {
const { theme } = this.state;
return
}
}
}
`
themeListener is an Object with following fields:
* themeListener.contextTypes
* type:
* meant to be added your component's contextTypes:
js`
static contextTypes = themeListener.contextTypes;
// or
static contextTypes = Object.assign({}, themeListener.contextTypes, {
/ your Component's contextTypes /
});
*
* type:
* takes a single context , where context is context of your componentconstructor
* meant to be used in
* throws an error if your component will be used outside ThemeProvider
* example:
js`
constructor(props, context) {
super(props, context);
this.state = { theme: themeListener.initial(context) }
}
*
* type:
* takes 2 arguments:
* context , where context is this.context from your componentFunction
* callback , which in turn will be invoked with theme update Object, every time theme is updated in ThemeProvider
* meant to be used in
* returns unsubscribe , which you should invoke in componentWillUnmount
* example:
js`
componentDidMount() {
this.unsubscribe = themeListener.subscribe(this.context, theme => this.setState({ theme }));
}
componentWillUnmount() {
if (typeof this.unsubscribe === 'function') {
this.unsubscribe();
}
}
$3
Function to create ThemeProvider and withTheme with custom context channel.
#### customChannel
Type: String __THEMING__
Default: Object { channel, withTheme, ThemeProvider. themeListener }
Result:
withTheme, ThemeProvider and themeListener are the same as default ones, but with overwritten context channel.
channel is customChannel to track what is context channel.
`js
import { createTheming } from 'theming';
const theming = createTheming('__styled-components__');
const { channel, withTheme, ThemeProvider, themeListener } = theming;
export default {
channel,
withTheme,
ThemeProvider,
themeListener,
};
``
Credits
* Thanks to [jss][jss] creator [Oleg Slobodskoi @kof][kof] for immersive help, support and code review.
* Thanks to [styled-components][sc] creator [Max Stoiber @mxstbr][mxstbr] for initial and battle tested implementation of theming support in [styled-components][sc] as well as help and code review.
* Thanks to [styled-components'][sc] core team member [Phil Plückthun @philpl][philpl] for help and code review.
* Thanks to [glamorous][glamorous] creator [Kent C. Dodds @kentcdodds][kentcdodds] for help, support and code review.
* Thanks to [glamorous's][glamorous] core team member [Alessandro Arnodo @vesparny][vesparny] for improved theming support in [glamorous][glamorous] and [brcast][brcast].
* Thanks to [Gert Sallaerts @gertt][gertt] for the [playground][playground] demo.
[kof]: https://github.com/kof
[mxstbr]: https://github.com/mxstbr
[philpl]: https://github.com/philpl
[kentcdodds]: https://github.com/kentcdodds
[vesparny]: https://github.com/vesparny
[gertt]: https://github.com/gertt
[jss]: https://github.com/cssinjs/jss
[sc]: https://github.com/styled-components/styled-components
[glamorous]: https://github.com/paypal/glamorous
[brcast]: https://github.com/vesparny/brcast
[playground]: https://www.webpackbin.com/bins/-Km8TglfWP84oYhDquT1
License
MIT © Vladimir Starkov
[npm-url]: https://npmjs.org/package/theming
[npm-image]: https://img.shields.io/npm/v/theming.svg?style=flat-square
[travis-url]: https://travis-ci.org/iamstarkov/theming
[travis-image]: https://img.shields.io/travis/iamstarkov/theming.svg?style=flat-square
[coveralls-url]: https://coveralls.io/r/iamstarkov/theming
[coveralls-image]: https://img.shields.io/coveralls/iamstarkov/theming.svg?style=flat-square
[depstat-url]: https://david-dm.org/iamstarkov/theming
[depstat-image]: https://david-dm.org/nordnet/grid.svg?style=flat-square