public void InflateByMonths(int value)
{
if (value > 0)
{
/*
* steps is positive
* decrease min, increase max by the amount of steps
*/
if (Minimum.TryAddMonths(-value.NotBelow((int)(Bounds.Minimum - Minimum).Months()), out DateTime dtn))
{
Minimum = dtn;
}
if (Maximum.TryAddMonths(value.NotAbove((int)(Bounds.Maximum - Maximum).Months()), out DateTime dtx))
{
Maximum = dtx;
}
}
else if (value < 0)
{
/*
* steps is negative
* increase min, decrease max by the amount of steps
*/
if (Minimum.TryAddMonths(-value.NotAbove((int)(Bounds.Maximum - Minimum).Months()), out DateTime dtn))
{
Minimum = dtn;
}
if (Maximum.TryAddMonths(value.NotBelow((int)(Bounds.Minimum - Maximum).Months()), out DateTime dtx))
{
Maximum = dtx;
}
}
}
public void ShiftByMonths(int value)
{
if (value > 0)
{
/*
* steps is positive
* increase min, max by the amount of steps only
* if they will be less than or equal bounds max
*/
if (Minimum.TryAddMonths(value.NotAbove((int)(Bounds.Maximum - Minimum).Months()), out DateTime dtn))
{
Minimum = dtn;
}
if (Maximum.TryAddMonths(value.NotAbove((int)(Bounds.Maximum - Maximum).Months()), out DateTime dtx))
{
Maximum = dtx;
}
}
else if (value < 0)
{
/*
* steps is negative
* decrease min, max by the amount of steps only
* if they will be greater than or equal bounds min
*/
// This is not a mistake, I'll actually add a negative to a negative
if (Minimum.TryAddMonths(value.NotBelow((int)(Bounds.Minimum - Minimum).Months()), out DateTime dtn))
{
Minimum = dtn;
}
if (Maximum.TryAddMonths(value.NotBelow((int)(Bounds.Minimum - Maximum).Months()), out DateTime dtx))
{
Maximum = dtx;
}
}
}
public DateRangeLister(DateTime minimum, DateTime maximum, DateTimeUnit unit)
: base(minimum, maximum)
{
switch (unit)
{
case DateTimeUnit.Year:
_count = (int)Maximum.Years(Minimum);
_getNextValue = () =>
{
if (Index < 0)
{
return(Minimum);
}
if (Index >= _count - 1)
{
return(null);
}
if (Minimum.TryAddYears(Index + 1, out DateTime result))
{
return(result);
}
return(null);
};
break;
case DateTimeUnit.Month:
_count = (int)Maximum.Months(Minimum).NotAbove(int.MaxValue);
_getNextValue = () =>
{
if (Index < 0)
{
return(Minimum);
}
if (Index >= _count - 1)
{
return(null);
}
if (Minimum.TryAddMonths(Index + 1, out DateTime result))
{
return(result);
}
return(null);
};
break;
case DateTimeUnit.Hour:
_count = (int)Maximum.Hours(Minimum).NotAbove(int.MaxValue);
_getNextValue = () =>
{
if (Index < 0)
{
return(Minimum);
}
if (Index >= _count - 1)
{
return(null);
}
if (Minimum.TryAddHours(Index + 1, out DateTime result))
{
return(result);
}
return(null);
};
break;
case DateTimeUnit.Minute:
_count = (int)Maximum.Minutes(Minimum).NotAbove(int.MaxValue);
_getNextValue = () =>
{
if (Index < 0)
{
return(Minimum);
}
if (Index >= _count - 1)
{
return(null);
}
if (Minimum.TryAddMinutes(Index + 1, out DateTime result))
{
return(result);
}
return(null);
};
break;
case DateTimeUnit.Second:
_count = (int)Maximum.Seconds(Minimum).NotAbove(int.MaxValue);
_getNextValue = () =>
{
if (Index < 0)
{
return(Minimum);
}
if (Index >= _count - 1)
{
return(null);
}
if (Minimum.TryAddSeconds(Index + 1, out DateTime result))
{
return(result);
}
return(null);
};
break;
case DateTimeUnit.Millisecond:
_count = (int)Maximum.Milliseconds(Minimum).NotAbove(int.MaxValue);
_getNextValue = () =>
{
if (Index < 0)
{
return(Minimum);
}
if (Index >= _count - 1)
{
return(null);
}
if (Minimum.TryAddMilliseconds(Index + 1, out DateTime result))
{
return(result);
}
return(null);
};
break;
default: // default to add day
_count = (int)Maximum.Days(Minimum).NotAbove(int.MaxValue);
_getNextValue = () =>
{
if (Index < 0)
{
return(Minimum);
}
if (Index >= _count - 1)
{
return(null);
}
if (Minimum.TryAddDays(Index + 1, out DateTime result))
{
return(result);
}
return(null);
};
break;
}
}
