Method maybeTransitionPrevMonth

src/components/DayPicker.jsx:765–778

(newFocusedDate)

  }

  maybeTransitionPrevMonth(newFocusedDate) {
    const { numberOfMonths } = this.props;
    const { currentMonth, focusedDate } = this.state;

    const newFocusedDateMonth = newFocusedDate.month();
    const focusedDateMonth = focusedDate.month();
    const isNewFocusedDateVisible = isDayVisible(newFocusedDate, currentMonth, numberOfMonths);
    if (newFocusedDateMonth !== focusedDateMonth && !isNewFocusedDateVisible) {
      this.onPrevMonthTransition(newFocusedDate);
      return true;
    }

    return false;
  }

  isHorizontal() {
    const { orientation } = this.props;