Function ClickChangeDateCheat

src/cheat_gui.cpp:106–139

* Handle changing of the current year. * @param new_value The chosen year to change to. * @return New year. */

 * @return New year.
 */
static int32_t ClickChangeDateCheat(int32_t new_value, int32_t)
{
	/* Don't allow changing to an invalid year, or the current year. */
	auto new_year = Clamp(TimerGameCalendar::Year(new_value), CalendarTime::MIN_YEAR, CalendarTime::MAX_YEAR);
	if (new_year == TimerGameCalendar::year) return TimerGameCalendar::year.base();

	TimerGameCalendar::YearMonthDay ymd = TimerGameCalendar::ConvertDateToYMD(TimerGameCalendar::date);
	TimerGameCalendar::Date new_calendar_date = TimerGameCalendar::ConvertYMDToDate(new_year, ymd.month, ymd.day);

	TimerGameCalendar::SetDate(new_calendar_date, TimerGameCalendar::date_fract);

	/* If not using wallclock units, we keep economy date in sync with calendar date and must change it also. */
	if (!TimerGameEconomy::UsingWallclockUnits()) {
		/* Keep economy and calendar dates synced. */
		TimerGameEconomy::Date new_economy_date{new_calendar_date.base()};

		/* Shift cached dates before we change the date. */
		for (auto v : Vehicle::Iterate()) v->ShiftDates(new_economy_date - TimerGameEconomy::date);
		LinkGraphSchedule::instance.ShiftDates(new_economy_date - TimerGameEconomy::date);

		/* Now it's safe to actually change the date. */
		TimerGameEconomy::SetDate(new_economy_date, TimerGameEconomy::date_fract);
	}

	CalendarEnginesMonthlyLoop();
	SetWindowDirty(WC_STATUS_BAR, 0);
	InvalidateWindowClassesData(WC_BUILD_STATION, 0);
	InvalidateWindowClassesData(WC_BUS_STATION, 0);
	InvalidateWindowClassesData(WC_TRUCK_STATION, 0);
	InvalidateWindowClassesData(WC_BUILD_OBJECT, 0);
	InvalidateWindowClassesData(WC_FINANCES, 0);
	ResetSignalVariant();
	return TimerGameCalendar::year.base();
}

/**
 * Allow (or disallow) a change of the maximum allowed heightlevel.