/// <summary>
/// DateOffset as Offset with Unit, i.e. "1 день"
/// </summary>
public static string GetOffsetUnitString(DateOffset d)
{
if (d == null || d.IsEmpty)
{
return(string.Empty);
}
return(string.Format("{0} {1}", d.Offset, GetUnitString(d.Offset, d.Unit)));
}
public void FillDateAndNowFrom(DateOffset d)
{
Contract.Requires(d != null);
SetDate(d.Year, d.Month, d.Day);
OnPropertyChanged("Year", "Month", "Day");
Now = d.Now;
}
/// <summary>
/// Установка даты меняет единицу измерения и смещение на наиболее подходящие.
/// </summary>
public static DateOffset RoundOffsetUnitByDate(this DateOffset d, DateTime described)
{
Contract.Requires(d.Year != null);
Contract.Ensures(d.Equals(Contract.OldValue(d)));
int? offset = null;
DateUnit unit = 0;
Action setRoundedOffsetUnitMonthOrYear = () =>
{
var months = DateHelper.GetTotalMonthsBetween(described, d.Year.Value, d.Month.Value);
if (months < 12) // меньше года - месяцы
{
offset = months;
unit = DateUnit.Month;
}
else
{
offset = described.Year - d.Year.Value;
unit = DateUnit.Year;
}
};
if (d.Month == null) // _ _ y (или d _ y без автообрезания)
{
offset = described.Year - d.Year.Value;
unit = DateUnit.Year;
}
else if (d.Day == null) // _ m y
{
setRoundedOffsetUnitMonthOrYear();
}
else // d m y
{
var days = (described - (DateTime)d).Days;
if (days < 7) // меньше недели - дни
{
offset = days;
unit = DateUnit.Day;
}
else if (days < 4 * 7) // меньше месяца - недели
{
offset = days / 7;
unit = DateUnit.Week;
}
else
{
setRoundedOffsetUnitMonthOrYear();
}
}
return(new DateOffset(offset, unit, () => d.Now));
}
/// <summary>
/// DateOffset as partial DateTime, i.e. "2014"
/// </summary>
public static string GetPartialDateString(DateOffset d)
{
if (d == null || d.IsEmpty || d.Year == null)
{
return(string.Empty);
}
if (!d.Month.HasValue) // year
{
return(d.Year.ToString());
}
if (!d.Day.HasValue) // month year
{
return(System.Globalization.DateTimeFormatInfo.CurrentInfo.MonthNames[d.Month.Value - 1].ToLower() + " " + d.Year.ToString());
}
return(((DateTime)d).ToString("d MMMM yyyy")); // full
}
/// <summary>
/// Округляет смещение.
/// При укрупнении единицы смещение считается для полной даты с 1 вместо отсутствующих значений.
/// </summary>
public static int?RoundOffsetFor(this DateOffset d, DateUnit unit)
{
Contract.Requires(d != null);
Contract.Ensures(d.Equals(Contract.OldValue(d)));
Contract.Ensures(!d.IsEmpty || Contract.Result <int?>() == null);
if (!d.Year.HasValue)
{
return(null);
}
int?roundedOffset;
switch (unit)
{
case DateUnit.Day:
roundedOffset = (d.Now - d.GetSortingDate()).Days;
break;
case DateUnit.Week:
roundedOffset = (d.Now - d.GetSortingDate()).Days / 7;
break;
case DateUnit.Month:
if (d.Month.HasValue)
{
roundedOffset = DateHelper.GetTotalMonthsBetween(d.Now, d.Year.Value, d.Month.Value);
}
else
{
roundedOffset = DateHelper.GetTotalMonthsBetween(d.Now, d.Year.Value, 1);
}
break;
case DateUnit.Year:
roundedOffset = d.Now.Year - d.Year.Value;
break;
default:
throw new NotImplementedException();
}
return(roundedOffset);
}
public DateOffset RelativeTo(DateOffset d)
{
Contract.Requires(d != null);
var max = this >= d ? this : d;
var min = this < d ? this : d;
var com = CommonPartWith(d);
switch (com)
{
case DateUnit.Year:
return(new DateOffset(min.Year, null, null, () => max.GetSortingDate()));
case DateUnit.Month:
return(new DateOffset(min.Year, min.Month, null, () => max.GetSortingDate()));
case DateUnit.Day:
return(new DateOffset(min.Year, min.Month, min.Day, () => max.GetSortingDate()));
default:
return(new DateOffset(null, null, null, () => max.GetSortingDate()));
}
}
private DateUnit?CommonPartWith(DateOffset d)
{
DateUnit?commonPart = null;
if (Year != null && d.Year != null)
{
if (Month != null && d.Month != null)
{
if (Day != null && d.Day != null)
{
commonPart = DateUnit.Day;
}
else
{
commonPart = DateUnit.Month;
}
}
else
{
commonPart = DateUnit.Year;
}
}
return(commonPart);
}
public DateOffset(DateOffset d)
: this(d.Year, d.Month, d.Day, () => d.Now)
{
Contract.Requires(d != null);
}