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我正在 React 創(chuàng)建一些按鈕，觸發(fā)從一個(gè)到下一個(gè)的狀態(tài)更改。我的一些按鈕具有三種狀態(tài)，由枚舉表示。這三種狀態(tài)應(yīng)按連續(xù)順序設(shè)置。當(dāng)達(dá)到最后一個(gè)值時(shí)，下一個(gè)操作應(yīng)該再次將狀態(tài)設(shè)置回枚舉的第一個(gè)值。實(shí)現(xiàn)這個(gè)的巧妙方法是什么？

import { create } from 'zustand'
import { devtools, persist, createJSONStorage } from 'zustand/middleware'
import { BackgroundVariant as Background } from 'reactflow';

function nextBackground(background: Background): Background {
  switch (background) {
    case Background.Dots:
      return Background.Cross;
    case Background.Cross:
      return Background.Lines;
    default:
      return Background.Dots;
  };
};

interface MenuState {
  background: Background;
  toggleBackground: () => void;
}

export const useMenuStore = create<MenuState>()(
  devtools(
    persist(
      (set) => ({
        background: Background.Dots,
        toggleBackground: () => set((state) => ({
          background: nextBackground(state.background)
        }))
      }),
      {
        name: 'menu-storage',
        storage: createJSONStorage(() => localStorage),
      }
    )
  )
);

function getNextEnumValue>(enumObj: T, currentValue: T[keyof T]): T[keyof T] { const enumValues = Object.values(enumObj); const enumKeys = Object.keys(enumObj) as (keyof T)[]; const currentIndex = enumKeys.findIndex(key => enumObj[key] === currentValue); if (currentIndex === -1) { throw new Error(`Invalid enum value: ${currentValue}`); } const nextIndex = currentIndex + 1; if (nextIndex === enumKeys.length) { return enumObj[enumKeys[0]]; } const nextValue = enumObj[enumKeys[nextIndex]]; if (!enumValues.includes(nextValue)) { throw new Error(`Invalid enum value: ${nextValue}`); } return nextValue; }