wehub-resource-sync
74 lines
1.8 KiB
TypeScript
74 lines
1.8 KiB
TypeScript
import type { Reducer } from "react";
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import { useReducer } from "react";
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export type ListState<T> = {
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items: T[];
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};
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type AppendAction<T> = {
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type: "append";
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items: T[];
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};
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type UpdateAction<T> = {
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type: "update";
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index: number;
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item: T;
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};
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type DeleteAction<_T> = {
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type: "delete";
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index: number;
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};
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type InsertAfter<T> = {
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type: "insertAfter";
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index: number;
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items: T[];
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};
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type Action<T> = AppendAction<T> | UpdateAction<T> | DeleteAction<T> | InsertAfter<T>;
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function reducer<T>(state: ListState<T>, action: Action<T>): ListState<T> {
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switch (action.type) {
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case "append":
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return { items: [...state.items, ...action.items] };
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case "update":
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return {
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items: state.items.map((v, i) => (i === action.index ? action.item : v)),
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};
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case "delete":
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return { items: state.items.filter((_, i) => i !== action.index) };
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case "insertAfter":
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return {
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items: [
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...state.items.slice(0, action.index + 1),
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...action.items,
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...state.items.slice(action.index + 1),
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],
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};
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}
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}
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type HookReturn<T> = {
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items: T[];
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append: (items: T[]) => void;
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update: (index: number, item: T) => void;
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delete: (index: number) => void;
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insertAfter: (index: number, items: T[]) => void;
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};
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export function useList<T>(initialItems: T[]): HookReturn<T> {
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const [state, dispatch] = useReducer<Reducer<ListState<T>, Action<T>>>(reducer, {
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items: initialItems,
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});
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return {
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items: state.items,
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append: (items: T[]) => dispatch({ type: "append", items }),
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update: (index: number, item: T) => dispatch({ type: "update", index, item }),
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delete: (index: number) => dispatch({ type: "delete", index }),
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insertAfter: (index: number, items: T[]) => dispatch({ type: "insertAfter", index, items }),
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};
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}
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