react-native-full-calendars/lib/module/swiper/hooks/useSwiperController.js

React Native Full Calendar (RNFC) is an intuitive and powerful calendar component library designed for React Native.

"use strict";

import { useContext, useState } from 'react';
import { Easing, runOnJS, useAnimatedReaction, withTiming } from 'react-native-reanimated';
import { SwiperContext } from '../store';
export function useSwiperController(ctrOptions) {
  const {
    props
  } = useContext(SwiperContext);
  const {
    minIndex,
    maxIndex,
    initialIndex = 0,
    onPageChange
  } = props;
  const {
    layoutPage,
    viewSize,
    translate,
    pageAnim
  } = ctrOptions;
  const [currentIndex, setCurrentIndex] = useState(initialIndex);
  const onPageChangeInternal = pg => {
    onPageChange?.(pg);
    setCurrentIndex(pg);
  };
  useAnimatedReaction(() => {
    return Math.round(pageAnim.value);
  }, (cur, prev) => {
    if (cur !== prev) {
      runOnJS(onPageChangeInternal)(cur);
    }
  }, []);
  const setPage = (index, options = {}) => {
    const pSize = viewSize.value || layoutPage;
    const updatedTranslate = index * pSize * -1 + initialIndex * pSize;
    if (index < minIndex || index > maxIndex) {
      return;
    }
    if (options.animated) {
      translate.value = withTiming(updatedTranslate, {
        duration: 500,
        easing: Easing.bezier(0.25, 1, 0.5, 1)
      });
    } else {
      translate.value = updatedTranslate;
    }
  };
  const nextPage = async (options = {}) => {
    setPage(getCurrIndex() + 1, options);
  };
  const prevPage = async (options = {}) => {
    setPage(getCurrIndex() - 1, options);
  };
  const getCurrIndex = () => {
    return currentIndex;
  };
  return {
    setPage,
    getCurrIndex,
    nextPage,
    prevPage
  };
}
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