26 lines
1.1 KiB
JavaScript
26 lines
1.1 KiB
JavaScript
/**
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* Determines the initial month to display in the calendar based on the provided
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* props.
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*
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* This function calculates the starting month, considering constraints such as
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* `startMonth`, `endMonth`, and the number of months to display.
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*
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* @param props The DayPicker props, including navigation and date constraints.
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* @param dateLib The date library to use for date manipulation.
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* @returns The initial month to display.
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*/
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export function getInitialMonth(props, navStart, navEnd, dateLib) {
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const { month, defaultMonth, today = dateLib.today(), numberOfMonths = 1, } = props;
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let initialMonth = month || defaultMonth || today;
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const { differenceInCalendarMonths, addMonths, startOfMonth } = dateLib;
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if (navEnd &&
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differenceInCalendarMonths(navEnd, initialMonth) < numberOfMonths - 1) {
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const offset = -1 * (numberOfMonths - 1);
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initialMonth = addMonths(navEnd, offset);
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}
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if (navStart && differenceInCalendarMonths(initialMonth, navStart) < 0) {
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initialMonth = navStart;
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}
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return startOfMonth(initialMonth);
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}
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