admin
98 lines
2.6 KiB
TypeScript
98 lines
2.6 KiB
TypeScript
"use client";
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import { createContext, useCallback, useContext, useMemo, useState } from "react";
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type Ctx = {
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ids: Set<number>;
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has: (id: number) => boolean;
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toggle: (id: number) => void;
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selectMany: (ids: number[]) => void;
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setMany: (ids: number[]) => void;
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selectRangeTo: (id: number, orderedIds: number[]) => void;
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clear: () => void;
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lastClickedId: number | null;
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};
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const ActressSelectCtx = createContext<Ctx | null>(null);
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export function ActressSelectionProvider({ children }: { children: React.ReactNode }) {
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const [ids, setIds] = useState<Set<number>>(new Set());
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const [lastClickedId, setLastClickedId] = useState<number | null>(null);
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const toggle = useCallback((id: number) => {
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setIds((cur) => {
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const next = new Set(cur);
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if (next.has(id)) next.delete(id); else next.add(id);
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return next;
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});
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setLastClickedId(id);
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}, []);
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const selectMany = useCallback((newIds: number[]) => {
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setIds((cur) => {
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const next = new Set(cur);
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newIds.forEach((i) => next.add(i));
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return next;
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});
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}, []);
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const setMany = useCallback((newIds: number[]) => {
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setIds(new Set(newIds));
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}, []);
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const selectRangeTo = useCallback((id: number, orderedIds: number[]) => {
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const last = lastClickedId;
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if (last == null) {
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setIds((cur) => {
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const next = new Set(cur);
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next.add(id);
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return next;
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});
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setLastClickedId(id);
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return;
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}
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const a = orderedIds.indexOf(last);
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const b = orderedIds.indexOf(id);
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if (a === -1 || b === -1) {
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setIds((cur) => {
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const next = new Set(cur);
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next.add(id);
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return next;
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});
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setLastClickedId(id);
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return;
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}
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const [start, end] = a < b ? [a, b] : [b, a];
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const range = orderedIds.slice(start, end + 1);
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setIds((cur) => {
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const next = new Set(cur);
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range.forEach((i) => next.add(i));
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return next;
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});
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setLastClickedId(id);
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}, [lastClickedId]);
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const clear = useCallback(() => {
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setIds(new Set());
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setLastClickedId(null);
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}, []);
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const value = useMemo<Ctx>(() => ({
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ids,
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has: (id) => ids.has(id),
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toggle,
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selectMany,
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setMany,
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selectRangeTo,
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clear,
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lastClickedId,
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}), [ids, toggle, selectMany, setMany, selectRangeTo, clear, lastClickedId]);
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return <ActressSelectCtx.Provider value={value}>{children}</ActressSelectCtx.Provider>;
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}
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export function useActressSelection() {
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const ctx = useContext(ActressSelectCtx);
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if (!ctx) throw new Error("useActressSelection must be used within ActressSelectionProvider");
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return ctx;
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}
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