71 lines
1.9 KiB
JavaScript
71 lines
1.9 KiB
JavaScript
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import listToStyles from './listToStyles'
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export default function addStylesToShadowDOM (parentId, list, shadowRoot) {
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var styles = listToStyles(parentId, list)
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addStyles(styles, shadowRoot)
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}
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/*
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type StyleObject = {
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id: number;
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parts: Array<StyleObjectPart>
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}
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type StyleObjectPart = {
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css: string;
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media: string;
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sourceMap: ?string
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}
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*/
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function addStyles (styles /* Array<StyleObject> */, shadowRoot) {
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const injectedStyles =
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shadowRoot._injectedStyles ||
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(shadowRoot._injectedStyles = {})
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for (var i = 0; i < styles.length; i++) {
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var item = styles[i]
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var style = injectedStyles[item.id]
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if (!style) {
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for (var j = 0; j < item.parts.length; j++) {
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addStyle(item.parts[j], shadowRoot)
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}
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injectedStyles[item.id] = true
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}
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}
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}
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function createStyleElement (shadowRoot) {
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var styleElement = document.createElement('style')
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styleElement.type = 'text/css'
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shadowRoot.appendChild(styleElement)
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return styleElement
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}
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function addStyle (obj /* StyleObjectPart */, shadowRoot) {
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var styleElement = createStyleElement(shadowRoot)
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var css = obj.css
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var media = obj.media
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var sourceMap = obj.sourceMap
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if (media) {
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styleElement.setAttribute('media', media)
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}
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if (sourceMap) {
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// https://developer.chrome.com/devtools/docs/javascript-debugging
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// this makes source maps inside style tags work properly in Chrome
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css += '\n/*# sourceURL=' + sourceMap.sources[0] + ' */'
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// http://stackoverflow.com/a/26603875
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css += '\n/*# sourceMappingURL=data:application/json;base64,' + btoa(unescape(encodeURIComponent(JSON.stringify(sourceMap)))) + ' */'
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}
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if (styleElement.styleSheet) {
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styleElement.styleSheet.cssText = css
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} else {
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while (styleElement.firstChild) {
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styleElement.removeChild(styleElement.firstChild)
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}
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styleElement.appendChild(document.createTextNode(css))
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}
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}
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