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Improve swap lang button for language and text swapping #482

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16 changes: 14 additions & 2 deletions src/components/translator/LanguageSelector.tsx
Original file line number Diff line number Diff line change
Expand Up @@ -28,6 +28,7 @@ export type Props = {
tgtLang: string;
setTgtLang: (code: string) => void;
recentTgtLangs: Array<string>;
swapLangText: () => void;

detectLangEnabled: boolean;
detectedLang: string | null;
Expand Down Expand Up @@ -423,17 +424,28 @@ const DesktopLanguageSelector = ({
};

const LanguageSelector = (props: Props): React.ReactElement => {
const { pairs, srcLang, setSrcLang, recentSrcLangs, setRecentSrcLangs, tgtLang, setTgtLang, setDetectedLang } = props;
const {
pairs,
srcLang,
setSrcLang,
recentSrcLangs,
setRecentSrcLangs,
tgtLang,
setTgtLang,
setDetectedLang,
swapLangText,
} = props;

const swapLangs = React.useMemo(
() =>
isPair(pairs, tgtLang, srcLang)
? () => {
setSrcLang(tgtLang);
setTgtLang(srcLang);
swapLangText();
}
: undefined,
[pairs, setSrcLang, setTgtLang, srcLang, tgtLang],
[pairs, setSrcLang, setTgtLang, srcLang, tgtLang, swapLangText],
);

const [detectingLang, setDetectingLang] = React.useState(false);
Expand Down
18 changes: 10 additions & 8 deletions src/components/translator/TextTranslationForm.tsx
Original file line number Diff line number Diff line change
Expand Up @@ -11,11 +11,10 @@ import { useHistory } from 'react-router-dom';
import { useMatomo } from '@datapunt/matomo-tracker-react';

import { DetectCompleteEvent, DetectEvent, PairPrefValues, TranslateEvent, baseUrlParams } from '.';
import { MaxURLLength, buildNewSearch, getUrlParam } from '../../util/url';
import { MaxURLLength, buildNewSearch } from '../../util/url';
import { APyContext } from '../../context';
import { buildUrl as buildWebpageTranslationUrl } from './WebpageTranslationForm';
import { langDirection } from '../../util/languages';
import useLocalStorage from '../../util/useLocalStorage';
import { useLocalization } from '../../util/localization';

const textUrlParam = 'q';
Expand All @@ -36,6 +35,10 @@ export type Props = {
markUnknown: boolean;
pairPrefs: PairPrefValues;
setLoading: (loading: boolean) => void;
srcText: string;
tgtText: string;
setSrcText: (text: string) => void;
setTgtText: (text: string) => void;
};

const TextTranslationForm = ({
Expand All @@ -45,6 +48,10 @@ const TextTranslationForm = ({
instantTranslation,
pairPrefs,
setLoading,
srcText,
tgtText,
setSrcText,
setTgtText,
}: Props): React.ReactElement => {
const { t } = useLocalization();
const history = useHistory();
Expand All @@ -54,11 +61,6 @@ const TextTranslationForm = ({
const srcTextareaRef = React.useRef<HTMLTextAreaElement>(null);
const tgtTextareaRef = React.useRef<HTMLTextAreaElement>(null);

const [srcText, setSrcText] = useLocalStorage('srcText', '', {
overrideValue: getUrlParam(history.location.search, textUrlParam),
});
const [tgtText, setTgtText] = React.useState('');

React.useEffect(() => {
const baseParams = baseUrlParams({ srcLang, tgtLang });
let search = buildNewSearch({ ...baseParams, [textUrlParam]: srcText });
Expand Down Expand Up @@ -130,7 +132,7 @@ const TextTranslationForm = ({
}
})();
},
[apyFetch, markUnknown, prefs, setLoading, srcLang, srcText, tgtLang, trackEvent],
[apyFetch, markUnknown, prefs, setLoading, setTgtText, srcLang, srcText, tgtLang, trackEvent],
);

const translationTimer = React.useRef<number | null>(null);
Expand Down
24 changes: 23 additions & 1 deletion src/components/translator/Translator.tsx
Original file line number Diff line number Diff line change
Expand Up @@ -243,11 +243,16 @@ const WithTgtLang = ({
const Translator = ({ mode: initialMode }: { mode?: Mode }): React.ReactElement => {
const mode: Mode = initialMode || Mode.Text;

const textUrlParam = 'q';
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This shouldn't be repeated twice. It should be defined in exactly one place.

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I want to confirm if the suggestion is to define it globally, or if there's an alternative approach you recommend for maintaining it in a single place?

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You can define it one component (ideally the parent component) and export the constant for use in other files.

const { t } = useLocalization();
const history = useHistory();
const config = React.useContext(ConfigContext);

const [loading, setLoading] = React.useState(false);
const [srcText, setSrcText] = useLocalStorage('srcText', '', {
overrideValue: getUrlParam(history.location.search, textUrlParam),
});
const [tgtText, setTgtText] = React.useState('');

const [markUnknown, setMarkUnknown] = useLocalStorage('markUnknown', false);
const [instantTranslation, setInstantTranslation] = useLocalStorage('instantTranslation', true);
Expand All @@ -272,6 +277,11 @@ const Translator = ({ mode: initialMode }: { mode?: Mode }): React.ReactElement

const onTranslate = React.useCallback(() => window.dispatchEvent(new Event(TranslateEvent)), []);

const swapLangText = () => {
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Let's use React.useCallback().

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Let's also call this swapLangs. It could be used for document translation as well.

setSrcText(tgtText);
setTgtText(srcText);
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Let's encapsulate the language switching here as well.

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Moving the target text to the source makes sense. But, making the source text the target text doesn't make sense since Apertium's translators are not necessarily bijective. That is, just because "foo" in X translates into "bar" in Y doesn't mean "bar" in Y will translate into "foo" in X.

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Thanks for pointing that out. Yeah, it makes no sense to make the source text the target text

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This function doesn't have any purpose now? I think we can just pass swapLangs around now. It's also a bit odd that swapLangs only has one thing happen inside it. Can we also move the actual language swap there instead of src/components/translator/LanguageSelector.tsx?


return (
<Form
aria-label={t('Translate')}
Expand Down Expand Up @@ -307,12 +317,24 @@ const Translator = ({ mode: initialMode }: { mode?: Mode }): React.ReactElement
tgtLang,
detectedLang,
loading,
swapLangText,
}}
/>
{(mode === Mode.Text || !mode) && (
<>
<TextTranslationForm
{...{ instantTranslation, markUnknown, setLoading, srcLang, tgtLang, pairPrefs }}
{...{
instantTranslation,
markUnknown,
setLoading,
srcLang,
tgtLang,
pairPrefs,
srcText,
tgtText,
setSrcText,
setTgtText,
}}
/>
<Row className="mt-2 mb-3">
<Col className="d-flex d-sm-block flex-wrap translation-modes" md="6" xs="12">
Expand Down
Original file line number Diff line number Diff line change
Expand Up @@ -23,6 +23,7 @@ const renderLanguageSelector = (props_: Partial<Props> = {}): Props => {
detectLangEnabled: true,
detectedLang: null,
setDetectedLang: jest.fn(),
swapLangText: jest.fn(),
...props_,
};

Expand Down Expand Up @@ -90,14 +91,15 @@ describe('swapping', () => {
});

it('allow swapping when swapped pair valid', () => {
const { srcLang, tgtLang, setSrcLang, setTgtLang } = renderLanguageSelector({
const { srcLang, tgtLang, setSrcLang, setTgtLang, swapLangText } = renderLanguageSelector({
tgtLang: 'spa',
});

userEvent.click(screen.getByTestId('swap-langs-button'));

expect(setSrcLang).toHaveBeenCalledWith(tgtLang);
expect(setTgtLang).toHaveBeenCalledWith(srcLang);
expect(swapLangText).toHaveBeenCalled();
});
});

Expand Down
44 changes: 42 additions & 2 deletions src/components/translator/__tests__/TextTranslationForm.test.tsx
Original file line number Diff line number Diff line change
Expand Up @@ -7,6 +7,10 @@ import userEvent from '@testing-library/user-event';

import { DetectCompleteEvent, DetectEvent, TranslateEvent } from '..';
import TextTranslationForm, { Props } from '../TextTranslationForm';
import { getUrlParam } from '../../../util/url';
import useLocalStorage from '../../../util/useLocalStorage';

const textUrlParam = 'q';

const renderTextTranslationForm = (
props_: Partial<Props> = {},
Expand All @@ -20,13 +24,34 @@ const renderTextTranslationForm = (
srcLang: 'eng',
tgtLang: 'spa',
pairPrefs: {},
srcText: '',
tgtText: '',
setSrcText: jest.fn(),
setTgtText: jest.fn(),
setLoading: jest.fn(),
...props_,
};

const Wrapper = () => {
const [srcText, setSrcText] = useLocalStorage('srcText', '', {
overrideValue: getUrlParam(history.location.search, textUrlParam),
});
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Why do we need to duplicate this code in a test...?

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To be honest, I'm currently stuck here, and I'm not entirely sure why I went with this approach. It seems to be the only way the tests are passing, and I need your help on how to improve this setup. The functionality of TextTranslationForm is closely tied to state variables passed as props from its parent.

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The problem is that the tests need to be relocated now. Moving the logic that pulls srcText from local storage from TextTranslationForm to Translator means that the tests which verify that functionality need to be moved to Translator.test.tsx.

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I realized that my knowledge of React testing might be a bit lacking. I plan to learn jest, and then I'll resume working on the pull request at a later point in time. I'll focus on other issues for now i.e. #405

const [tgtText, setTgtText] = React.useState('');

return (
<TextTranslationForm
{...props}
setSrcText={setSrcText}
setTgtText={setTgtText}
srcText={srcText}
tgtText={tgtText}
/>
);
};

render(
<Router history={history}>
<TextTranslationForm {...props} />
<Wrapper />
</Router>,
);

Expand Down Expand Up @@ -149,16 +174,31 @@ describe('translation', () => {
srcLang: 'eng',
tgtLang: 'spa',
pairPrefs: {},
srcText: '',
tgtText: '',
setSrcText: jest.fn(),
setTgtText: jest.fn(),
setLoading: jest.fn(),
};

const Container = () => {
const [srcLang, setSrcLang] = React.useState('eng');
const [srcText, setSrcText] = useLocalStorage('srcText', '', {
overrideValue: getUrlParam(history.location.search, textUrlParam),
});
const [tgtText, setTgtText] = React.useState('');
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Same question here as above.

return (
<>
<button onClick={() => setSrcLang('cat')}>ChangeSrcLang</button>
<Router history={history}>
<TextTranslationForm {...props} srcLang={srcLang} />
<TextTranslationForm
{...props}
setSrcText={setSrcText}
setTgtText={setTgtText}
srcLang={srcLang}
srcText={srcText}
tgtText={tgtText}
/>
</Router>
</>
);
Expand Down
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