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useFieldValue.ts
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useFieldValue.ts
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import { useMemo } from "react";
import { DeepIndex } from "../types/DeepIndex";
import { UseMainContextArg, UseMainContextReturn } from "./useMainContext";
import { get, isEqual } from "lodash";
import { ValuesFields } from "../types/ValuesFields";
import {
UseFieldChangeValueArg,
UseFieldChangeValueReturn,
} from "./useFieldChangeValue";
import { BaseValues } from "../types/BaseValues";
export interface UseFieldValueArg<Name> {
name: Name;
}
export interface UseFieldValueReturn<
Values extends BaseValues,
Name extends ValuesFields<Values>
> extends UseFieldChangeValueReturn<Values, Name> {
value: DeepIndex<Values, Name>;
initialValue: DeepIndex<Values, Name>;
hasChanged: boolean;
}
/**
* @private
*/
export interface CreateUseFieldValueDependencies<
Values extends BaseValues,
ExtraContext extends Record<string, unknown>
> {
useMainContext: (
arg: UseMainContextArg<Values, ExtraContext>
) => UseMainContextReturn<Values, ExtraContext>;
useFieldChangeValue: <Name extends ValuesFields<Values>>(
arg: UseFieldChangeValueArg<Name>
) => UseFieldChangeValueReturn<Values, Name>;
}
/**
* @private
*/
export const createUseFieldValue = <
Values extends BaseValues,
ExtraContext extends Record<string, unknown>
>({
useMainContext,
useFieldChangeValue,
}: CreateUseFieldValueDependencies<Values, ExtraContext>) => {
/**
* Logic around a fields value. Handles getting the field value out of the main context, the initial value, changing the value and if the value has changed.
*
* @param {UseFieldValueArg<Name>} arg
* @returns {UseFieldValueReturn<Values, Name>}
*/
const useFieldValue = <Name extends ValuesFields<Values>>({
name,
}: UseFieldValueArg<Name>): UseFieldValueReturn<Values, Name> => {
const { values, initialValues } = useMainContext({
shouldUpdate: (oldValue, newValue) => {
return (["values", "initialValues"] as const).some(
(v) => !isEqual(get(oldValue[v], name), get(newValue[v], name))
);
},
});
const { changeValue } = useFieldChangeValue<Name>({ name });
const value = useMemo(() => get(values, name), [values, name]);
const initialValue = useMemo(
() => get(initialValues, name),
[initialValues, name]
);
const hasChanged = useMemo(
() => !isEqual(value, initialValue),
[value, initialValue]
);
return useMemo(
() => ({
value,
changeValue,
initialValue,
hasChanged,
}),
[value, changeValue, initialValue, hasChanged]
);
};
return useFieldValue;
};