@tldraw/editor/dist-esm/lib/exports/exportToSvg.mjs.map

tldraw infinite canvas SDK (editor).

{
  "version": 3,
  "sources": ["../../../src/lib/exports/exportToSvg.tsx"],
  "sourcesContent": ["import { TLShapeId } from '@tldraw/tlschema'\nimport { assert } from '@tldraw/utils'\nimport { flushSync } from 'react-dom'\nimport { createRoot } from 'react-dom/client'\nimport { Editor } from '../editor/Editor'\nimport { TLSvgExportOptions } from '../editor/types/misc-types'\nimport { SVG_EXPORT_CLASSNAME } from './FontEmbedder'\nimport { StyleEmbedder } from './StyleEmbedder'\nimport { embedMedia } from './embedMedia'\nimport { getSvgJsx } from './getSvgJsx'\n\nlet idCounter = 1\n\nexport async function exportToSvg(\n\teditor: Editor,\n\tshapeIds: TLShapeId[],\n\topts: TLSvgExportOptions = {}\n) {\n\t// when rendering to SVG, we start by creating a JSX representation of the SVG that we can\n\t// render with react. Hopefully elements will have a `toSvg` method that renders them to SVG,\n\t// but if they don't we'll render their normal HTML content into an svg <foreignObject> element.\n\tconst result = getSvgJsx(editor, shapeIds, opts)\n\tif (!result) return undefined\n\n\t// we need to render that SVG into a real DOM element that's actually laid out in the document.\n\t// without this CSS and layout aren't computed correctly, which we need to make sure any\n\t// <foreignObject> elements have their styles and content inlined correctly.\n\tconst container = editor.getContainer()\n\tconst renderTarget = document.createElement('div')\n\trenderTarget.className = SVG_EXPORT_CLASSNAME\n\t// we hide the element visually, but we don't want it to be focusable or interactive in any way either\n\trenderTarget.inert = true\n\trenderTarget.tabIndex = -1\n\tObject.assign(renderTarget.style, {\n\t\tposition: 'absolute',\n\t\ttop: '0px',\n\t\tleft: '0px',\n\t\twidth: result.width + 'px',\n\t\theight: result.height + 'px',\n\t\tpointerEvents: 'none',\n\t\topacity: 0,\n\t})\n\t// we have to add the element to the document as otherwise styles won't be computed correctly.\n\tcontainer.appendChild(renderTarget)\n\n\t// create a react root...\n\tconst root = createRoot(renderTarget, { identifierPrefix: `export_${idCounter++}_` })\n\ttry {\n\t\t// ...wait for a tick so we know we're not in e.g. a react lifecycle method...\n\t\tawait Promise.resolve()\n\n\t\t// ...and render the SVG into it.\n\t\tflushSync(() => {\n\t\t\troot.render(result.jsx)\n\t\t})\n\n\t\t// Some operations take a while - for example, waiting for an asset to load in. We give\n\t\t// shape authors a way to delay snap-shotting the export until they're ready.\n\t\tawait result.exportDelay.resolve()\n\n\t\t// Extract the rendered SVG element from the react root\n\t\tconst svg = renderTarget.firstElementChild\n\t\tassert(svg instanceof SVGSVGElement, 'Expected an SVG element')\n\n\t\t// And apply any changes to <foreignObject> elements that we need to make. while we're in\n\t\t// the document, these elements work exactly as we'd expect from other dom elements - they\n\t\t// can load external resources, and any stylesheets in the document apply to them as we\n\t\t// would expect them to. But when we pull the SVG into its own file or draw it to a canvas\n\t\t// though, it has to be completely self-contained. We embed any external resources, and\n\t\t// apply any styles directly to the elements themselves.\n\t\tawait applyChangesToForeignObjects(svg)\n\n\t\treturn { svg, width: result.width, height: result.height }\n\t} finally {\n\t\t// eslint-disable-next-line no-restricted-globals\n\t\tsetTimeout(() => {\n\t\t\t// we wait for a cycle of the event loop to allow the svg to be cloned etc. before\n\t\t\t// unmounting\n\t\t\troot.unmount()\n\t\t\tcontainer.removeChild(renderTarget)\n\t\t}, 0)\n\t}\n}\n\nasync function applyChangesToForeignObjects(svg: SVGSVGElement) {\n\t// If any shapes have their own <foreignObject> elements, we don't want to mess with them. Our\n\t// ones that we need to embed will have a class of `tl-export-embed-styles`.\n\tconst foreignObjectChildren = [\n\t\t...svg.querySelectorAll('foreignObject.tl-export-embed-styles > *'),\n\t]\n\tif (!foreignObjectChildren.length) return\n\n\t// StyleEmbedder embeds any CSS - including resources like fonts and images.\n\tconst styleEmbedder = new StyleEmbedder(svg)\n\n\ttry {\n\t\t// begin traversing stylesheets to find @font-face declarations we might need to embed\n\t\tstyleEmbedder.fonts.startFindingCurrentDocumentFontFaces()\n\n\t\t// embed any media elements in the foreignObject children. images will get converted to data\n\t\t// urls, and things like videos will be converted to images.\n\t\tawait Promise.all(foreignObjectChildren.map((el) => embedMedia(el as HTMLElement)))\n\n\t\t// read the computed styles of every element (+ it's children & pseudo-elements) in the\n\t\t// document. we do this in a single pass before we start embedding any CSS stuff to avoid\n\t\t// constantly forcing the browser to recompute styles & layout.\n\t\tfor (const el of foreignObjectChildren) {\n\t\t\tstyleEmbedder.readRootElementStyles(el as HTMLElement)\n\t\t}\n\n\t\t// fetch any resources that we need to embed in the CSS, like background images.\n\t\tawait styleEmbedder.fetchResources()\n\t\tconst fontCss = await styleEmbedder.getFontFaceCss()\n\n\t\t// custom elements that make use of the shadow dom won't be serialized correctly by default:\n\t\t// the contents of the shadow dom will be ignored. once we've read the styles from the\n\t\t// document, we go through and replace any custom elements with plain `<div>`s. as we do so,\n\t\t// we traverse the shadow dom and clone it into the new plain div. any scoped stylesheets\n\t\t// are removed, as we've already read all the computed styles above.\n\t\tstyleEmbedder.unwrapCustomElements()\n\n\t\t// apply the computed styles (with their embedded resources) directly to the elements with\n\t\t// their `style` attribute. Anything that can't be done this way (pseudo-elements) will be\n\t\t// returned as a string of CSS.\n\t\tconst pseudoCss = styleEmbedder.embedStyles()\n\n\t\t// add the CSS to the SVG\n\t\tif (fontCss || pseudoCss) {\n\t\t\tconst style = document.createElementNS('http://www.w3.org/2000/svg', 'style')\n\t\t\tstyle.textContent = `${fontCss}\\n${pseudoCss}`\n\t\t\tsvg.prepend(style)\n\t\t}\n\t} finally {\n\t\tstyleEmbedder.dispose()\n\t}\n}\n"],
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