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Add README.md for lib/translation (#10005)
+59
src/lib/translation/README.md
+59
src/lib/translation/README.md
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# Translation
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A hook for translating text on-device for inline display.
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## Translating text
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```tsx
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const langPrefs = useLanguagePrefs()
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const {translate} = useTranslate({key: post.uri})
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// ...
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void translate({
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text: record.text,
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targetLangCode: langPrefs.primaryLanguage,
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})
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```
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## Clearing/hiding a translation
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```tsx
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const {clearTranslation} = useTranslate({key: post.uri})
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// ...
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clearTranslation()
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```
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## Rendering a translation
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```tsx
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const {translationState} = useTranslate({key: post.uri})
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// ...
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switch (translationState.status) {
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case 'idle':
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// Default state; render a link that calls `translate`.
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break;
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case 'loading':
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// On-device translation is in progress; render a loading spinner.
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break;
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case 'success':
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// Translation complete; render `translationState.translatedText` and a link
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// that calls `clearTranslation`.
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break;
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case 'error':
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// On-device translation failed; render `translationState.message` and a
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// link to `translate` from `useGoogleTranslate` as a fallback.
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break;
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}
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```
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## Notes
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* Android only supports two-letter language codes.
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* For example, this means it doesn’t differentiate between `pt-BR` and `pt-PT`.
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* Android and iOS only support a subset of the language options we offer (iOS supports fewer than Android).
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* Individual language packs must be downloaded on iOS.