@tldraw/editor/dist-esm/lib/editor/managers/FontManager/FontManager.mjs.map

tldraw infinite canvas SDK (editor).

{
  "version": 3,
  "sources": ["../../../../../src/lib/editor/managers/FontManager/FontManager.ts"],
  "sourcesContent": ["import { computed, EMPTY_ARRAY, transact } from '@tldraw/state'\nimport { AtomMap } from '@tldraw/store'\nimport { TLShape, TLShapeId } from '@tldraw/tlschema'\nimport {\n\tareArraysShallowEqual,\n\tcompact,\n\tFileHelpers,\n\tmapObjectMapValues,\n\tobjectMapEntries,\n} from '@tldraw/utils'\nimport { Editor } from '../../Editor'\n\n/**\n * Represents the `src` property of a {@link TLFontFace}.\n * See {@link https://developer.mozilla.org/en-US/docs/Web/CSS/@font-face/src | `src`} for details of the properties here.\n * @public\n */\nexport interface TLFontFaceSource {\n\t/**\n\t * A URL from which to load the font. If the value here is a key in\n\t * {@link tldraw#TLEditorAssetUrls.fonts}, the value from there will be used instead.\n\t */\n\turl: string\n\tformat?: string\n\ttech?: string\n}\n\n/**\n * A font face that can be used in the editor. The properties of this are largely the same as the\n * ones in the\n * {@link https://developer.mozilla.org/en-US/docs/Web/CSS/@font-face | css `@font-face` rule}.\n * @public\n */\nexport interface TLFontFace {\n\t/**\n\t * How this font can be referred to in CSS.\n\t * See {@link https://developer.mozilla.org/en-US/docs/Web/CSS/@font-face/font-family | `font-family`}.\n\t */\n\treadonly family: string\n\t/**\n\t * The source of the font. This\n\t * See {@link https://developer.mozilla.org/en-US/docs/Web/CSS/@font-face/src | `src`}.\n\t */\n\treadonly src: TLFontFaceSource\n\t/**\n\t * See {@link https://developer.mozilla.org/en-US/docs/Web/CSS/@font-face/ascent-override | `ascent-override`}.\n\t */\n\treadonly ascentOverride?: string\n\t/**\n\t * See {@link https://developer.mozilla.org/en-US/docs/Web/CSS/@font-face/descent-override | `descent-override`}.\n\t */\n\treadonly descentOverride?: string\n\t/**\n\t * See {@link https://developer.mozilla.org/en-US/docs/Web/CSS/@font-face/font-stretch | `font-stretch`}.\n\t */\n\treadonly stretch?: string\n\t/**\n\t * See {@link https://developer.mozilla.org/en-US/docs/Web/CSS/@font-face/font-style | `font-style`}.\n\t */\n\treadonly style?: string\n\t/**\n\t * See {@link https://developer.mozilla.org/en-US/docs/Web/CSS/@font-face/font-weight | `font-weight`}.\n\t */\n\treadonly weight?: string\n\t/**\n\t * See {@link https://developer.mozilla.org/en-US/docs/Web/CSS/@font-face/font-feature-settings | `font-feature-settings`}.\n\t */\n\treadonly featureSettings?: string\n\t/**\n\t * See {@link https://developer.mozilla.org/en-US/docs/Web/CSS/@font-face/line-gap-override | `line-gap-override`}.\n\t */\n\treadonly lineGapOverride?: string\n\t/**\n\t * See {@link https://developer.mozilla.org/en-US/docs/Web/CSS/@font-face/unicode-range | `unicode-range`}.\n\t */\n\treadonly unicodeRange?: string\n}\n\ninterface FontState {\n\treadonly state: 'loading' | 'ready' | 'error'\n\treadonly instance: FontFace\n\treadonly loadingPromise: Promise<void>\n}\n\n/** @public */\nexport class FontManager {\n\tconstructor(\n\t\tprivate readonly editor: Editor,\n\t\tprivate readonly assetUrls?: { [key: string]: string | undefined }\n\t) {\n\t\tthis.shapeFontFacesCache = editor.store.createComputedCache(\n\t\t\t'shape font faces',\n\t\t\t(shape: TLShape) => {\n\t\t\t\tconst shapeUtil = this.editor.getShapeUtil(shape)\n\t\t\t\treturn shapeUtil.getFontFaces(shape)\n\t\t\t},\n\t\t\t{\n\t\t\t\tareResultsEqual: areArraysShallowEqual,\n\t\t\t\tareRecordsEqual: (a, b) => a.props === b.props && a.meta === b.meta,\n\t\t\t}\n\t\t)\n\n\t\tthis.shapeFontLoadStateCache = editor.store.createCache<(FontState | null)[], TLShape>(\n\t\t\t(id: TLShapeId) => {\n\t\t\t\tconst fontFacesComputed = computed('font faces', () => this.getShapeFontFaces(id))\n\t\t\t\treturn computed(\n\t\t\t\t\t'font load state',\n\t\t\t\t\t() => {\n\t\t\t\t\t\tconst states = fontFacesComputed.get().map((face) => this.getFontState(face))\n\t\t\t\t\t\treturn states\n\t\t\t\t\t},\n\t\t\t\t\t{ isEqual: areArraysShallowEqual }\n\t\t\t\t)\n\t\t\t}\n\t\t)\n\t}\n\n\tprivate readonly shapeFontFacesCache\n\tprivate readonly shapeFontLoadStateCache\n\n\tgetShapeFontFaces(shape: TLShape | TLShapeId): TLFontFace[] {\n\t\tconst shapeId = typeof shape === 'string' ? shape : shape.id\n\t\treturn this.shapeFontFacesCache.get(shapeId) ?? EMPTY_ARRAY\n\t}\n\n\ttrackFontsForShape(shape: TLShape | TLShapeId) {\n\t\tconst shapeId = typeof shape === 'string' ? shape : shape.id\n\t\tthis.shapeFontLoadStateCache.get(shapeId)\n\t}\n\n\tasync loadRequiredFontsForCurrentPage(limit = Infinity) {\n\t\tconst neededFonts = new Set<TLFontFace>()\n\t\tfor (const shapeId of this.editor.getCurrentPageShapeIds()) {\n\t\t\tfor (const font of this.getShapeFontFaces(this.editor.getShape(shapeId)!)) {\n\t\t\t\tneededFonts.add(font)\n\t\t\t}\n\t\t}\n\n\t\tif (neededFonts.size > limit) {\n\t\t\treturn\n\t\t}\n\n\t\tconst promises = Array.from(neededFonts, (font) => this.ensureFontIsLoaded(font))\n\t\tawait Promise.all(promises)\n\t}\n\n\tprivate readonly fontStates = new AtomMap<TLFontFace, FontState>('font states')\n\tprivate getFontState(font: TLFontFace): FontState | null {\n\t\treturn this.fontStates.get(font) ?? null\n\t}\n\n\tensureFontIsLoaded(font: TLFontFace): Promise<void> {\n\t\tconst existingState = this.getFontState(font)\n\t\tif (existingState) return existingState.loadingPromise\n\n\t\tconst instance = this.findOrCreateFontFace(font)\n\t\tconst state: FontState = {\n\t\t\tstate: 'loading',\n\t\t\tinstance,\n\t\t\tloadingPromise: instance\n\t\t\t\t.load()\n\t\t\t\t.then(() => {\n\t\t\t\t\tdocument.fonts.add(instance)\n\t\t\t\t\tthis.fontStates.update(font, (s) => ({ ...s, state: 'ready' }))\n\t\t\t\t})\n\t\t\t\t.catch((err) => {\n\t\t\t\t\tconsole.error(err)\n\t\t\t\t\tthis.fontStates.update(font, (s) => ({ ...s, state: 'error' }))\n\t\t\t\t}),\n\t\t}\n\n\t\tthis.fontStates.set(font, state)\n\t\treturn state.loadingPromise\n\t}\n\n\tprivate fontsToLoad = new Set<TLFontFace>()\n\trequestFonts(fonts: TLFontFace[]) {\n\t\tif (!this.fontsToLoad.size) {\n\t\t\tqueueMicrotask(() => {\n\t\t\t\tif (this.editor.isDisposed) return\n\t\t\t\tconst toLoad = this.fontsToLoad\n\t\t\t\tthis.fontsToLoad = new Set()\n\t\t\t\ttransact(() => {\n\t\t\t\t\tfor (const font of toLoad) {\n\t\t\t\t\t\tthis.ensureFontIsLoaded(font)\n\t\t\t\t\t}\n\t\t\t\t})\n\t\t\t})\n\t\t}\n\t\tfor (const font of fonts) {\n\t\t\tthis.fontsToLoad.add(font)\n\t\t}\n\t}\n\n\tprivate findOrCreateFontFace(font: TLFontFace) {\n\t\tfor (const existing of document.fonts) {\n\t\t\tif (\n\t\t\t\texisting.family === font.family &&\n\t\t\t\tobjectMapEntries(defaultFontFaceDescriptors).every(\n\t\t\t\t\t([key, defaultValue]) => existing[key] === (font[key] ?? defaultValue)\n\t\t\t\t)\n\t\t\t) {\n\t\t\t\treturn existing\n\t\t\t}\n\t\t}\n\n\t\tconst url = this.assetUrls?.[font.src.url] ?? font.src.url\n\t\tconst instance = new FontFace(font.family, `url(${JSON.stringify(url)})`, {\n\t\t\t...mapObjectMapValues(defaultFontFaceDescriptors, (key) => font[key]),\n\t\t\tdisplay: 'swap',\n\t\t})\n\n\t\tdocument.fonts.add(instance)\n\n\t\treturn instance\n\t}\n\n\tasync toEmbeddedCssDeclaration(font: TLFontFace) {\n\t\tconst url = this.assetUrls?.[font.src.url] ?? font.src.url\n\t\tconst dataUrl = await FileHelpers.urlToDataUrl(url)\n\n\t\tconst src = compact([\n\t\t\t`url(\"${dataUrl}\")`,\n\t\t\tfont.src.format ? `format(${font.src.format})` : null,\n\t\t\tfont.src.tech ? `tech(${font.src.tech})` : null,\n\t\t]).join(' ')\n\t\treturn compact([\n\t\t\t`@font-face {`,\n\t\t\t`  font-family: \"${font.family}\";`,\n\t\t\tfont.ascentOverride ? `  ascent-override: ${font.ascentOverride};` : null,\n\t\t\tfont.descentOverride ? `  descent-override: ${font.descentOverride};` : null,\n\t\t\tfont.stretch ? `  font-stretch: ${font.stretch};` : null,\n\t\t\tfont.style ? `  font-style: ${font.style};` : null,\n\t\t\tfont.weight ? `  font-weight: ${font.weight};` : null,\n\t\t\tfont.featureSettings ? `  font-feature-settings: ${font.featureSettings};` : null,\n\t\t\tfont.lineGapOverride ? `  line-gap-override: ${font.lineGapOverride};` : null,\n\t\t\tfont.unicodeRange ? `  unicode-range: ${font.unicodeRange};` : null,\n\t\t\t`  src: ${src};`,\n\t\t\t`}`,\n\t\t]).join('\\n')\n\t}\n}\n\n// From https://drafts.csswg.org/css-font-loading/#fontface-interface\nconst defaultFontFaceDescriptors = {\n\tstyle: 'normal',\n\tweight: 'normal',\n\tstretch: 'normal',\n\tunicodeRange: 'U+0-10FFFF',\n\tfeatureSettings: 'normal',\n\tascentOverride: 'normal',\n\tdescentOverride: 'normal',\n\tlineGapOverride: 'normal',\n}\n"],
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