all files / lib/src/instance/functions/ style.js

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import {
	parse,
	multiply,
	rotateX,
	rotateY,
	rotateZ,
	scale,
	translateX,
	translateY,
} from 'redpill'
 
import { getPrefixedStyleProperty } from '../../utils/browser'
 
 
export default function style (element) {
	var computed = window.getComputedStyle(element.node)
	var position = computed.position
	var config = element.config
 
	/**
	 * Generate inline styles
	 */
	var inlineRegex = /.+[^;]/g
	var inlineStyle = element.node.getAttribute('style') || ''
	var inlineMatch = inlineRegex.exec(inlineStyle)
 
	var inline = (inlineMatch) ? ((inlineMatch[0]) + ";") : ''
	if (inline.indexOf('visibility: visible') === -1) {
		inline += (inline.length) ? ' ' : ''
		inline += 'visibility: visible;'
	}
 
	/**
	 * Generate opacity styles
	 */
	var computedOpacity = parseFloat(computed.opacity)
	var configOpacity = !isNaN(parseFloat(config.opacity))
		? parseFloat(config.opacity)
		: parseFloat(computed.opacity)
 
	var opacity = {
		computed: (computedOpacity !== configOpacity) ? ("opacity: " + computedOpacity + ";") : '',
		generated: (computedOpacity !== configOpacity) ? ("opacity: " + configOpacity + ";") : '',
	}
 
	/**
	 * Generate transformation styles
	 */
	var transformations = []
 
	if (parseFloat(config.distance)) {
		var axis = (config.origin === 'top' || config.origin === 'bottom') ? 'Y' : 'X'
 
		/**
		 * Let’s make sure our our pixel distances are negative for top and left.
		 * e.g. { origin: 'top', distance: '25px' } starts at `top: -25px` in CSS.
    	 */
		var distance = config.distance
		if (config.origin === 'top' || config.origin === 'left') {
			distance = /^-/.test(distance)
				? distance.substr(1)
				: ("-" + distance)
		}
 
		var ref = distance.match(/(^-?\d+\.?\d?)|(em$|px$|\%$)/g);
		var value = ref[0];
		var unit = ref[1];
 
		switch (unit) {
			case 'em':
				distance = parseInt(computed.fontSize) * value
				break
			case 'px':
				distance = value
				break
			case '%':
				distance = (axis === 'Y')
					? element.node.getBoundingClientRect().height * value / 100
					: element.node.getBoundingClientRect().width * value / 100
				break
			default:
				throw new RangeError('Unrecognized or missing distance unit.')
		}
 
		(axis === 'Y')
			? transformations.push(translateY(distance))
			: transformations.push(translateX(distance))
	}
 
	if (config.rotate.x) { transformations.push(rotateX(config.rotate.x)) }
	if (config.rotate.y) { transformations.push(rotateY(config.rotate.y)) }
	if (config.rotate.z) { transformations.push(rotateZ(config.rotate.z)) }
	if (config.scale !== 1) { transformations.push(scale(config.scale)) }
 
	var transform = {}
	if (transformations.length) {
 
		transform.property = getPrefixedStyleProperty('transform')
		/**
		* The default computed transform value should be one of:
		* undefined || 'none' || 'matrix()' || 'matrix3d()'
		*/
		transform.computed = {
			raw: computed[transform.property],
			matrix: parse(computed[transform.property]),
		}
 
		transformations.unshift(transform.computed.matrix)
		var product = transformations.reduce(multiply)
 
		transform.generated = {
			initial: ((transform.property) + ": matrix3d(" + (product.join(', ')) + ");"),
			final: ((transform.property) + ": matrix3d(" + (transform.computed.matrix.join(', ')) + ");"),
		}
	} else {
		transform.generated = {
			initial: '',
			final: '',
		}
	}
 
	/**
	 * Generate transition styles
	 */
	var transition = {}
	if (opacity.generated || transform.generated.initial) {
 
		transition.property = getPrefixedStyleProperty('transition')
		transition.computed = computed[transition.property]
		transition.fragments = []
 
		var delay = config.delay;
		var duration = config.duration;
		var easing = config.easing;
 
		if (opacity.generated) {
			transition.fragments.push({
				delayed: ("opacity " + (duration / 1000) + "s " + easing + " " + (delay / 1000) + "s"),
				instant: ("opacity " + (duration / 1000) + "s " + easing + " 0s"),
			})
		}
 
		if (transform.generated.initial) {
			transition.fragments.push({
				delayed: ((transform.property) + " " + (duration / 1000) + "s " + easing + " " + (delay / 1000) + "s"),
				instant: ((transform.property) + " " + (duration / 1000) + "s " + easing + " 0s"),
			})
		}
 
		/**
		 * The default computed transition property should be one of:
		 * undefined || '' || 'all 0s ease 0s' || 'all 0s 0s cubic-bezier()'
		 */
		if (transition.computed && !transition.computed.match(/all 0s/)) {
			transition.fragments.unshift({
				delayed: transition.computed,
				instant: transition.computed,
			})
		}
 
		var composed = transition.fragments.reduce(function (composition, fragment, i) {
			composition.delayed += (i === 0) ? fragment.delayed : (", " + (fragment.delayed))
			composition.instant += (i === 0) ? fragment.instant : (", " + (fragment.instant))
			return composition
		}, {
			delayed: '',
			instant: '',
		})
 
		transition.generated = {
			delayed: ((transition.property) + ": " + (composed.delayed) + ";"),
			instant: ((transition.property) + ": " + (composed.instant) + ";"),
		}
	}
 
	return {
		inline: inline,
		opacity: opacity,
		position: position,
		transform: transform,
		transition: transition,
	}
}