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import {
AbsoluteTime,
AmountJson,
TranslatedString,
} from "@gnu-taler/taler-util";
import { ComponentChildren, VNode, createContext, h } from "preact";
import {
MutableRef,
StateUpdater,
useEffect,
useRef,
useState,
} from "preact/hooks";
export interface FormType<T> {
value: MutableRef<Partial<T>>;
initialValue?: Partial<T>;
onUpdate?: StateUpdater<T>;
computeFormState?: (v: T) => FormState<T>;
}
//@ts-ignore
export const FormContext = createContext<FormType<any>>({});
export type FormState<T> = {
[field in keyof T]?: T[field] extends AbsoluteTime
? Partial<InputFieldState>
: T[field] extends AmountJson
? Partial<InputFieldState>
: T[field] extends Array<infer P>
? Partial<InputArrayFieldState<P>>
: T[field] extends (object | undefined)
? FormState<T[field]>
: Partial<InputFieldState>;
};
export interface InputFieldState {
/* should show the error */
error?: TranslatedString;
/* should not allow to edit */
readonly: boolean;
/* should show as disable */
disabled: boolean;
/* should not show */
hidden: boolean;
}
export interface InputArrayFieldState<T> extends InputFieldState {
elements: FormState<T>[];
}
export function FormProvider<T>({
children,
initialValue,
onUpdate: notify,
onSubmit,
computeFormState,
}: {
initialValue?: Partial<T>;
onUpdate?: (v: Partial<T>) => void;
onSubmit?: (v: Partial<T>, s: FormState<T> | undefined) => void;
computeFormState?: (v: Partial<T>) => FormState<T>;
children: ComponentChildren;
}): VNode {
// const value = useRef(initialValue ?? {});
// useEffect(() => {
// return function onUnload() {
// value.current = initialValue ?? {};
// };
// });
// const onUpdate = notify
const [state, setState] = useState<Partial<T>>(initialValue ?? {});
const value = { current: state };
// console.log("RENDER", initialValue, value);
const onUpdate = (v: typeof state) => {
// console.log("updated");
setState(v);
if (notify) notify(v);
};
return (
<FormContext.Provider
value={{ initialValue, value, onUpdate, computeFormState }}
>
<form
onSubmit={(e) => {
e.preventDefault();
//@ts-ignore
if (onSubmit)
onSubmit(
value.current,
!computeFormState ? undefined : computeFormState(value.current),
);
}}
>
{children}
</form>
</FormContext.Provider>
);
}
|
