cortex-css's Introduction

cortex-css

CSS Style Sheet Factory DSL

Description

Glow is a library for generating CSS. It provides a type-safe DSL for creating a heirarchy of selectors and associated rules.

Installation

npm install ndugger/glow --save

Example

import { createStyleSheet } from 'cortex-css'

const styleSheet = document.createElement('style')

styleSheet.textContent = createStyleSheet(css => {
    css.select('button', css => {
        css.write(`
            background-color: blue;
            color: white;
        `)
        css.selectHover(css => {
            css.write(`
                opacity: 0.85;
            `)
        })
    })
})

document.head.append(styleSheet)

Usage With Cortex

import { Component, createElement } from 'cortex'
import { createStyleSheet } from 'cortex-css'

export class Example extends Component {

    protected render() {
        return [
            createElement(HTMLButtonElement, { type: 'submit' },
                createElement(HTMLSlotElement)
            )
        ]
    }
    
    protected theme() {
        return createStyleSheet(css => {
            css.selectClass(HTMLButtonElement, css => {
                css.write(`
                    background-color: blue;
                    color: white;
                `)
                css.selectHover(css => {
                    css.write(`
                        opacity: 0.85;
                    `)
                })
            })
        })
    }
}

Alternative Usage

Instead of writing raw CSS properties, you may also use css.assign() and pass in a partial CSSStyleDeclaration object. Note that this is less performant, as the object needs to be serialized into valid CSS before writing to the style sheet, but it can help with code correctness in some situations.

createStyleSheet(css => {
    css.select('button', css => {
        css.assign({
            backgroundColor: 'blue',
            color: 'white'
        })
        css.selectHover(css => {
            css.assign({
                opacity: '0.85'
            })
        })
    })
})

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