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e025088065
Add documentation for CodeMirror extensions GitOrigin-RevId: e5f07084173f201919272f9d46dcdaef4b817874
33 lines
1.1 KiB
TypeScript
33 lines
1.1 KiB
TypeScript
import { ViewPlugin } from '@codemirror/view'
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import { StateEffect } from '@codemirror/state'
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import { updateHasEffect } from '../utils/effects'
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const fontLoadEffect = StateEffect.define<readonly FontFace[]>()
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export const hasFontLoadedEffect = updateHasEffect(fontLoadEffect)
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/**
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* A custom extension that listens for an event indicating that fonts have finished loading,
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* then dispatches an effect which other extensions can use to recalculate values.
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*/
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export const fontLoad = ViewPlugin.define(view => {
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function listener(this: FontFaceSet, event: FontFaceSetLoadEvent) {
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view.dispatch({ effects: fontLoadEffect.of(event.fontfaces) })
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}
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const fontLoadSupport = 'fonts' in document
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if (fontLoadSupport) {
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// TypeScript doesn't appear to know the correct type for the listener
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document.fonts.addEventListener('loadingdone', listener as EventListener)
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}
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return {
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destroy() {
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if (fontLoadSupport) {
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document.fonts.removeEventListener(
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'loadingdone',
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listener as EventListener
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)
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}
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},
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}
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})
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