internal DateTime GetFirstDateToRenderForDisplayMode(DateTime date, CalendarDisplayMode displayMode)
{
date = date.Date;
DateTime firstDateToRender = date;
if (displayMode == CalendarDisplayMode.MultiDayView)
{
DayOfWeek firstDayOfWeek = this.GetFirstDayOfWeek();
DateTime firstDateOfCurrentWeek = CalendarMathHelper.GetFirstDayOfCurrentWeek(date, firstDayOfWeek);
if (!(firstDateOfCurrentWeek.Date <= date.Date && firstDateOfCurrentWeek.AddDays(7).Date >= date.Date))
{
firstDateToRender = firstDateOfCurrentWeek;
}
if (!this.multiDayViewSettings.WeekendsVisible)
{
firstDateToRender = CalendarMathHelper.AddBusinessDays(date, -this.multiDayViewSettings.VisibleDays);
}
else
{
firstDateToRender = date.AddDays(-this.multiDayViewSettings.VisibleDays);
}
}
else if (displayMode == CalendarDisplayMode.MonthView)
{
DayOfWeek firstDayOfWeekToUse = this.GetFirstDayOfWeek();
DateTime monthStartDate = CalendarMathHelper.GetFirstDateOfMonth(date);
int daysToSubtract = (int)monthStartDate.DayOfWeek - (int)firstDayOfWeekToUse;
if (daysToSubtract <= 0)
{
daysToSubtract += 7;
}
firstDateToRender = monthStartDate.Date == DateTime.MinValue.Date ? monthStartDate : monthStartDate.AddDays(-daysToSubtract);
}
else if (displayMode == CalendarDisplayMode.YearView)
{
firstDateToRender = CalendarMathHelper.GetFirstDateOfYear(date);
}
else if (displayMode == CalendarDisplayMode.DecadeView)
{
firstDateToRender = CalendarMathHelper.GetFirstDateOfDecade(date);
}
else if (displayMode == CalendarDisplayMode.CenturyView)
{
firstDateToRender = CalendarMathHelper.GetFirstDateOfCentury(date);
}
return(firstDateToRender);
}
internal static DateTime GetCellDateForViewLevel(DateTime date, CalendarDisplayMode displayMode)
{
switch (displayMode)
{
case CalendarDisplayMode.YearView:
return(CalendarMathHelper.GetFirstDateOfMonth(date));
case CalendarDisplayMode.DecadeView:
return(CalendarMathHelper.GetFirstDateOfYear(date));
case CalendarDisplayMode.CenturyView:
return(CalendarMathHelper.GetFirstDateOfDecade(date));
default:
return(date);
}
}
internal static DateTime GetFirstDateForCurrentDisplayUnit(DateTime date, CalendarDisplayMode displayMode)
{
// NOTE: Ignore time part for calendar calculations.
date = date.Date;
switch (displayMode)
{
case CalendarDisplayMode.YearView:
return(CalendarMathHelper.GetFirstDateOfYear(date));
case CalendarDisplayMode.DecadeView:
return(CalendarMathHelper.GetFirstDateOfDecade(date));
case CalendarDisplayMode.CenturyView:
return(CalendarMathHelper.GetFirstDateOfCentury(date));
default:
return(CalendarMathHelper.GetFirstDateOfMonth(date));
}
}
internal static bool IsCalendarViewChanged(DateTime displayDate, DateTime newDisplayDate, CalendarDisplayMode displayMode)
{
// NOTE: Ignore time part for calendar calculations.
displayDate = displayDate.Date;
newDisplayDate = newDisplayDate.Date;
switch (displayMode)
{
case CalendarDisplayMode.YearView:
return(displayDate.Year != newDisplayDate.Year);
case CalendarDisplayMode.DecadeView:
return(CalendarMathHelper.GetFirstDateOfDecade(displayDate) != CalendarMathHelper.GetFirstDateOfDecade(newDisplayDate));
case CalendarDisplayMode.CenturyView:
return(CalendarMathHelper.GetFirstDateOfCentury(displayDate) != CalendarMathHelper.GetFirstDateOfCentury(newDisplayDate));
default:
return(CalendarMathHelper.GetFirstDateOfMonth(displayDate) != CalendarMathHelper.GetFirstDateOfMonth(newDisplayDate));
}
}
private static DateTime GetLastDateOfDecadeView(DateTime date)
{
return(CalendarMathHelper.GetFirstDateOfDecade(date).AddYears(9));
}
internal override DateTime GetFirstDateToRender(DateTime date)
{
return(CalendarMathHelper.GetFirstDateOfDecade(date));
}
