react-native-paper-dates/lib/module/Date/SwiperUtils.js

Performant Date Picker for React Native Paper

"use strict";

import { useEffect } from 'react';
import { useLatest } from '../shared/utils';
import { addMonths, differenceInMonths, getRealIndex, getStartAtIndex, getTotalMonths } from './dateUtils';
import { defaultStartYear, defaultEndYear } from './dateUtils';
// Helper function to get the minimum allowed index based on startYear
export function getMinIndex(startYear, endYear) {
  if (!startYear) return 0;
  const today = new Date();
  const startDate = new Date(startYear, 0, 1); // January 1st of startYear
  const months = differenceInMonths(today, startDate);
  const dynamicStartAtIndex = getStartAtIndex(startYear, endYear);
  const minIndex = dynamicStartAtIndex + months;
  const totalMonths = getTotalMonths(startYear, endYear);

  // Allow any valid index within the dynamic range, no hard minimum
  return Math.max(0, Math.min(minIndex, totalMonths - 1));
}

// Helper function to get the maximum allowed index based on endYear
export function getMaxIndex(startYear, endYear) {
  const dynamicStartAtIndex = getStartAtIndex(startYear, endYear);
  const totalMonths = getTotalMonths(startYear, endYear);
  if (!endYear) return totalMonths - 1;
  const today = new Date();
  const endDate = new Date(endYear, 11, 31); // December 31st of endYear
  const months = differenceInMonths(today, endDate);
  const maxIndex = dynamicStartAtIndex + months;

  // Allow any valid index within the dynamic range
  return Math.max(0, Math.min(maxIndex, totalMonths - 1));
}

// Helper function to check if an index is within allowed range
export function isIndexWithinRange(index, startYear, endYear) {
  const minIndex = getMinIndex(startYear || defaultStartYear, endYear);
  const maxIndex = getMaxIndex(startYear, endYear || defaultEndYear);
  return index >= minIndex && index <= maxIndex;
}
export function useYearChange(onChange, {
  selectedYear,
  currentIndexRef,
  startYear,
  endYear
}) {
  const onChangeRef = useLatest(onChange);
  useEffect(() => {
    if (selectedYear) {
      const currentIndex = currentIndexRef.current || 0;
      const currentDate = addMonths(new Date(), getRealIndex(currentIndex, startYear, endYear));
      currentDate.setFullYear(selectedYear);
      const today = new Date();
      const months = differenceInMonths(today, currentDate);
      const dynamicStartAtIndex = getStartAtIndex(startYear, endYear);
      const totalMonths = getTotalMonths(startYear, endYear);
      const newIndex = dynamicStartAtIndex + months;
      // Ensure the new index is within valid bounds
      const boundedIndex = Math.max(0, Math.min(newIndex, totalMonths - 1));
      if (currentIndex !== boundedIndex) {
        onChangeRef.current(boundedIndex);
      }
    }
  }, [currentIndexRef, onChangeRef, selectedYear, startYear, endYear]);
}
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