Method _multipleSelection

packages/main/src/DayPicker.ts:623–657

* Called when at least one day is selected and the user presses "Shift". * @param timestamp * @private

(timestamp: number)

	 * @private
	 */
	_multipleSelection(timestamp: number) {
		const min = Math.min(...this.selectedDates);
		const max = Math.max(...this.selectedDates);
		let start;
		let end;
		let toggle = false;

		if (timestamp < min) {
			start = timestamp;
			end = min;
		} else if (timestamp >= min && timestamp <= max) { // inside the current range - toggle all between the selected and focused
			const distanceToMin = Math.abs(timestamp - min);
			const distanceToMax = Math.abs(timestamp - max);

			if (distanceToMin < distanceToMax) {
				start = timestamp;
				end = max;
			} else {
				start = min;
				end = timestamp;
			}
			toggle = true;
		} else {
			start = max;
			end = timestamp;
		}

		const startDate = CalendarDate.fromTimestamp(start * 1000);
		const endDate = CalendarDate.fromTimestamp(end * 1000);

		while (startDate.valueOf() <= endDate.valueOf()) {
			this[toggle ? "_toggleTimestampInSelection" : "_addTimestampToSelection"](startDate.valueOf() / 1000);
			startDate.setDate(startDate.getDate() + 1);
		}
	}

	/**
	 * Set the hovered day as the "_secondTimestamp".