@tldraw/editor
Version:
tldraw infinite canvas SDK (editor).
8 lines (7 loc) • 17.1 kB
Source Map (JSON)
{
"version": 3,
"sources": ["../../../src/lib/exports/StyleEmbedder.ts"],
"sourcesContent": ["import { assertExists, getOwnProperty, objectMapValues, uniqueId } from '@tldraw/utils'\nimport { FontEmbedder } from './FontEmbedder'\nimport { ReadonlyStyles, Styles, cssRules } from './cssRules'\nimport {\n\telementStyle,\n\tgetComputedStyle,\n\tgetRenderedChildNodes,\n\tgetRenderedChildren,\n} from './domUtils'\nimport { resourceToDataUrl } from './fetchCache'\nimport { parseCssValueUrls, shouldIncludeCssProperty } from './parseCss'\n\nconst NO_STYLES = {} as const\n\ninterface ElementStyleInfo {\n\tself: Styles\n\tbefore: Styles | undefined\n\tafter: Styles | undefined\n}\n\nexport class StyleEmbedder {\n\tconstructor(private readonly root: Element) {}\n\tprivate readonly styles = new Map<Element, ElementStyleInfo>()\n\treadonly fonts = new FontEmbedder()\n\n\treadRootElementStyles(rootElement: Element) {\n\t\t// when reading a root, we always apply _all_ the styles, even if they match the defaults\n\t\tthis.readElementStyles(rootElement, {\n\t\t\tshouldRespectDefaults: false,\n\t\t\tshouldSkipInheritedParentStyles: false,\n\t\t})\n\n\t\tconst children = Array.from(getRenderedChildren(rootElement))\n\t\twhile (children.length) {\n\t\t\tconst child = children.pop()!\n\t\t\tchildren.push(...getRenderedChildren(child))\n\n\t\t\t// when reading children, we don't apply styles that match the defaults for that\n\t\t\t// element, or that would be inherited from the parent\n\t\t\tthis.readElementStyles(child, {\n\t\t\t\tshouldRespectDefaults: true,\n\t\t\t\tshouldSkipInheritedParentStyles: true,\n\t\t\t})\n\t\t}\n\t}\n\n\tprivate readElementStyles(\n\t\telement: Element,\n\t\t{ shouldRespectDefaults = true, shouldSkipInheritedParentStyles = true }\n\t) {\n\t\tconst defaultStyles = shouldRespectDefaults\n\t\t\t? getDefaultStylesForTagName(element.tagName.toLowerCase())\n\t\t\t: NO_STYLES\n\n\t\tconst parentStyles = Object.assign({}, NO_STYLES) as Styles\n\t\tif (shouldSkipInheritedParentStyles) {\n\t\t\tlet el = element.parentElement\n\t\t\t// Keep going up the tree to find all the relevant styles\n\t\t\twhile (el) {\n\t\t\t\tconst currentStyles = this.styles.get(el)?.self\n\t\t\t\tfor (const style in currentStyles) {\n\t\t\t\t\tif (!parentStyles[style]) {\n\t\t\t\t\t\tparentStyles[style] = currentStyles[style]\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t\tel = el.parentElement\n\t\t\t}\n\t\t}\n\n\t\tconst info: ElementStyleInfo = {\n\t\t\tself: styleFromElement(element, { defaultStyles, parentStyles }),\n\t\t\tbefore: styleFromPseudoElement(element, '::before'),\n\t\t\tafter: styleFromPseudoElement(element, '::after'),\n\t\t}\n\t\tthis.styles.set(element, info)\n\t}\n\n\tfetchResources() {\n\t\tconst promises: Promise<void>[] = []\n\n\t\tfor (const info of this.styles.values()) {\n\t\t\tfor (const styles of objectMapValues(info)) {\n\t\t\t\tif (!styles) continue\n\t\t\t\tfor (const [property, value] of Object.entries(styles)) {\n\t\t\t\t\tif (!value) continue\n\t\t\t\t\tif (property === 'font-family') {\n\t\t\t\t\t\tthis.fonts.onFontFamilyValue(value)\n\t\t\t\t\t}\n\n\t\t\t\t\tconst urlMatches = parseCssValueUrls(value)\n\t\t\t\t\tif (urlMatches.length === 0) continue\n\n\t\t\t\t\tpromises.push(\n\t\t\t\t\t\t...urlMatches.map(async ({ url, original }) => {\n\t\t\t\t\t\t\tconst dataUrl = (await resourceToDataUrl(url)) ?? 'data:'\n\t\t\t\t\t\t\tstyles[property] = value.replace(original, `url(\"${dataUrl}\")`)\n\t\t\t\t\t\t})\n\t\t\t\t\t)\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\n\t\treturn Promise.all(promises)\n\t}\n\n\t// custom elements are tricky. if we serialize the dom as-is, the custom elements wont have\n\t// their shadow-dom contents serialized. after we've read all the styles, we need to unwrap the\n\t// contents of each custom elements shadow dom directly into the parent element itself.\n\tunwrapCustomElements() {\n\t\tconst visited = new Set<Node>()\n\n\t\tconst visit = (element: Element, clonedParent: Element | null) => {\n\t\t\tif (visited.has(element)) return\n\t\t\tvisited.add(element)\n\n\t\t\tconst shadowRoot = element.shadowRoot\n\n\t\t\tif (shadowRoot) {\n\t\t\t\tconst clonedCustomEl = document.createElement('div')\n\t\t\t\tthis.styles.set(clonedCustomEl, this.styles.get(element)!)\n\n\t\t\t\tclonedCustomEl.setAttribute('data-tl-custom-element', element.tagName)\n\t\t\t\t;(clonedParent ?? element.parentElement!).appendChild(clonedCustomEl)\n\n\t\t\t\tfor (const child of shadowRoot.childNodes) {\n\t\t\t\t\tif (child instanceof Element) {\n\t\t\t\t\t\tvisit(child, clonedCustomEl)\n\t\t\t\t\t} else {\n\t\t\t\t\t\tclonedCustomEl.appendChild(child.cloneNode(true))\n\t\t\t\t\t}\n\t\t\t\t}\n\n\t\t\t\telement.remove()\n\t\t\t} else if (clonedParent) {\n\t\t\t\tif (element.tagName.toLowerCase() === 'style') {\n\t\t\t\t\t// we don't clone style tags at that would break the style scoping. instead we\n\t\t\t\t\t// rely on the computed styles we've already read\n\t\t\t\t\treturn\n\t\t\t\t}\n\n\t\t\t\tconst clonedEl = element.cloneNode(false) as Element\n\t\t\t\tthis.styles.set(clonedEl, this.styles.get(element)!)\n\n\t\t\t\tclonedParent.appendChild(clonedEl)\n\n\t\t\t\tfor (const child of getRenderedChildNodes(element)) {\n\t\t\t\t\tif (child instanceof Element) {\n\t\t\t\t\t\tvisit(child, clonedEl)\n\t\t\t\t\t} else {\n\t\t\t\t\t\tclonedEl.appendChild(child.cloneNode(true))\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\n\t\tfor (const element of this.styles.keys()) {\n\t\t\tvisit(element, null)\n\t\t}\n\t}\n\n\tembedStyles(): string {\n\t\tlet css = ''\n\n\t\tfor (const [element, info] of this.styles) {\n\t\t\tif (info.after || info.before) {\n\t\t\t\tconst className = `pseudo-${uniqueId()}`\n\t\t\t\telement.classList.add(className)\n\n\t\t\t\tif (info.before) {\n\t\t\t\t\tcss += `.${className}::before {${formatCss(info.before)}}\\n`\n\t\t\t\t}\n\t\t\t\tif (info.after) {\n\t\t\t\t\tcss += `.${className}::after {${formatCss(info.after)}}\\n`\n\t\t\t\t}\n\t\t\t}\n\n\t\t\tconst style = elementStyle(element)\n\t\t\tfor (const [property, value] of Object.entries(info.self)) {\n\t\t\t\tif (!value) continue\n\t\t\t\tstyle.setProperty(property, value)\n\t\t\t}\n\n\t\t\t// in HTML, font-kerning: auto is equivalent to font-kerning: normal. But in SVG, it's\n\t\t\t// none. We set it to normal here to match the HTML behavior, as otherwise this can\n\t\t\t// cause rendering differences.\n\t\t\tif (style.fontKerning === 'auto') {\n\t\t\t\tstyle.fontKerning = 'normal'\n\t\t\t}\n\t\t}\n\n\t\treturn css\n\t}\n\n\tasync getFontFaceCss() {\n\t\treturn await this.fonts.createCss()\n\t}\n\n\tdispose() {\n\t\tdestroyDefaultStyleFrame()\n\t}\n}\n\ninterface ReadStyleOpts {\n\tdefaultStyles: ReadonlyStyles\n\tparentStyles: ReadonlyStyles\n}\n\nfunction styleFromElement(element: Element, { defaultStyles, parentStyles }: ReadStyleOpts) {\n\t// `computedStyleMap` produces a more accurate representation of the styles, but it's not\n\t// supported in firefox at the time of writing. 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'',\n\t}\n\tfor (const property of style.keys()) {\n\t\tif (!shouldIncludeCssProperty(property)) continue\n\n\t\tconst value = style.get(property)!.toString()\n\n\t\tif (defaultStyles[property] === value) continue\n\n\t\tconst rule = getOwnProperty(cssRules, property)\n\t\tif (rule && rule(value, property, ruleOptions)) continue\n\n\t\tstyles[property] = value\n\t}\n\n\treturn styles\n}\n\nfunction styleFromComputedStyle(\n\tstyle: CSSStyleDeclaration,\n\t{ defaultStyles, parentStyles }: ReadStyleOpts\n) {\n\tconst styles: Record<string, string> = {}\n\tconst currentColor = style.color\n\tconst ruleOptions = {\n\t\tcurrentColor,\n\t\tparentStyles,\n\t\tdefaultStyles,\n\t\tgetStyle: (property: string) => style.getPropertyValue(property),\n\t}\n\n\tfor (const property in style) {\n\t\tif (!shouldIncludeCssProperty(property)) continue\n\n\t\tconst value = style.getPropertyValue(property)\n\n\t\tif (defaultStyles[property] === value) continue\n\n\t\tconst rule = getOwnProperty(cssRules, property)\n\t\tif (rule && rule(value, property, ruleOptions)) continue\n\n\t\tstyles[property] = value\n\t}\n\treturn styles\n}\n\nfunction formatCss(style: ReadonlyStyles) {\n\tlet cssText = ''\n\tfor (const [property, value] of Object.entries(style)) {\n\t\tcssText += `${property}: ${value};`\n\t}\n\treturn cssText\n}\n\n// when we're figuring out the default values for a tag, we need read them from a separate document\n// so they're not affected by the current document's styles\nlet defaultStyleFrame:\n\t| { iframe: HTMLIFrameElement; foreignObject: SVGForeignObjectElement; document: Document }\n\t| undefined\nconst defaultStylesByTagName: Record<string, ReadonlyStyles> = {}\nfunction getDefaultStyleFrame() {\n\tif (!defaultStyleFrame) {\n\t\tconst frame = document.createElement('iframe')\n\t\tframe.style.display = 'none'\n\t\tdocument.body.appendChild(frame)\n\t\tconst frameDocument = assertExists(frame.contentDocument, 'frame must have a document')\n\t\tconst svg = document.createElementNS('http://www.w3.org/2000/svg', 'svg')\n\t\tconst foreignObject = document.createElementNS('http://www.w3.org/2000/svg', 'foreignObject')\n\t\tsvg.appendChild(foreignObject)\n\t\tframeDocument.body.appendChild(svg)\n\t\tdefaultStyleFrame = { iframe: frame, foreignObject, document: frameDocument }\n\t}\n\treturn defaultStyleFrame\n}\n\nfunction destroyDefaultStyleFrame() {\n\tif (defaultStyleFrame) {\n\t\tdocument.body.removeChild(defaultStyleFrame.iframe)\n\t\tdefaultStyleFrame = undefined\n\t}\n}\n\nconst defaultStyleReadOptions: ReadStyleOpts = { defaultStyles: NO_STYLES, parentStyles: NO_STYLES }\nfunction getDefaultStylesForTagName(tagName: string) {\n\tlet existing = defaultStylesByTagName[tagName]\n\tif (!existing) {\n\t\tconst { foreignObject, document } = getDefaultStyleFrame()\n\t\tconst element = document.createElement(tagName)\n\t\tforeignObject.appendChild(element)\n\t\texisting = element.computedStyleMap\n\t\t\t? styleFromComputedStyleMap(element.computedStyleMap(), defaultStyleReadOptions)\n\t\t\t: styleFromComputedStyle(getComputedStyle(element), defaultStyleReadOptions)\n\t\tforeignObject.removeChild(element)\n\t\tdefaultStylesByTagName[tagName] = existing\n\t}\n\treturn existing\n}\n"],
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