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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,63 @@ | ||
| import {defer, merge, Observable, of, switchMap} from 'rxjs'; | ||
|
|
||
| declare global { | ||
| interface Window { | ||
| /** | ||
| * query local fonts | ||
| * | ||
| * {@link https://developer.mozilla.org/en-US/docs/Web/API/Window/queryLocalFonts MDN Reference} | ||
| */ | ||
| queryLocalFonts?: (options?: { | ||
| postscriptNames: string[]; | ||
| }) => Promise<FontData[]>; | ||
| } | ||
|
|
||
| interface FontData { | ||
| /** | ||
| * the family of the font face | ||
| */ | ||
| readonly family: string; | ||
| /** | ||
| * the full name of the font face | ||
| */ | ||
| readonly fullName: string; | ||
| /** | ||
| * the PostScript name of the font face | ||
| */ | ||
| readonly postscriptName: string; | ||
| /** | ||
| * the style of the font face | ||
| */ | ||
| readonly style: string; | ||
| /** | ||
| * get a Promise that fulfills with a Blob containing the raw bytes of the underlying font file | ||
| */ | ||
| readonly blob: () => Promise<Blob>; | ||
| } | ||
| } | ||
|
|
||
| export function isLocalFontsFeatureSupported() { | ||
| const {queryLocalFonts} = window; | ||
| return !!queryLocalFonts; | ||
| } | ||
|
|
||
| export async function checkLocalFontPermission() { | ||
| const {navigator} = window; | ||
| return navigator.permissions.query({ | ||
| name: 'local-fonts', | ||
| // TODO: extend dom interfaces? | ||
| } as unknown as PermissionDescriptor); | ||
| } | ||
|
|
||
| export const checkLocalFontPermission$ = defer(() => | ||
| checkLocalFontPermission(), | ||
| ).pipe( | ||
| switchMap(permission => { | ||
| const permissionStateChange$ = new Observable<PermissionState>(observer => { | ||
| permission.onchange = function (this) { | ||
| observer.next(this.state); | ||
| }; | ||
| }); | ||
| return merge(of(permission.state), permissionStateChange$); | ||
| }), | ||
| ); |
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