private void UpdateDateTime(int value)
{
_fireSelectionChangedEvent = false;
DateTimeInfo info = _selectedDateTimeInfo;
//this only occurs when the user manually type in a value for the Value Property
if (info == null)
{
info = _dateTimeInfoList[0];
}
DateTime?result = null;
try
{
switch (info.Type)
{
case DateTimePart.Year:
{
result = ((DateTime)Value).AddYears(value);
break;
}
case DateTimePart.Month:
case DateTimePart.MonthName:
{
result = ((DateTime)Value).AddMonths(value);
break;
}
case DateTimePart.Day:
case DateTimePart.DayName:
{
result = ((DateTime)Value).AddDays(value);
break;
}
case DateTimePart.Hour12:
case DateTimePart.Hour24:
{
result = ((DateTime)Value).AddHours(value);
break;
}
case DateTimePart.Minute:
{
result = ((DateTime)Value).AddMinutes(value);
break;
}
case DateTimePart.Second:
{
result = ((DateTime)Value).AddSeconds(value);
break;
}
case DateTimePart.Millisecond:
{
result = ((DateTime)Value).AddMilliseconds(value);
break;
}
case DateTimePart.AmPmDesignator:
{
result = ((DateTime)Value).AddHours(value * 12);
break;
}
default:
{
break;
}
}
}
catch
{
//this can occur if the date/time = 1/1/0001 12:00:00 AM which is the smallest date allowed.
//I could write code that would validate the date each and everytime but I think that it would be more
//efficient if I just handle the edge case and allow an exeption to occur and swallow it instead.
}
this.Value = this.CoerceValueMinMax(result);
//we loose our selection when the Value is set so we need to reselect it without firing the selection changed event
TextBox.Select(info.StartPosition, info.Length);
_fireSelectionChangedEvent = true;
}
protected override void InitializeDateTimeInfoList()
{
_dateTimeInfoList.Clear();
_selectedDateTimeInfo = null;
string format = GetFormatString(Format);
if (string.IsNullOrEmpty(format))
{
return;
}
while (format.Length > 0)
{
int elementLength = GetElementLengthByFormat(format);
DateTimeInfo info = null;
switch (format[0])
{
case '"':
case '\'':
{
int closingQuotePosition = format.IndexOf(format[0], 1);
info = new DateTimeInfo
{
IsReadOnly = true,
Type = DateTimePart.Other,
Length = 1,
Content = format.Substring(1, Math.Max(1, closingQuotePosition - 1))
};
elementLength = Math.Max(1, closingQuotePosition + 1);
break;
}
case 'D':
case 'd':
{
string d = format.Substring(0, elementLength);
if (elementLength == 1)
{
d = "%" + d;
}
if (elementLength > 2)
{
info = new DateTimeInfo
{
IsReadOnly = true,
Type = DateTimePart.DayName,
Format = d
}
}
;
else
{
info = new DateTimeInfo
{
IsReadOnly = false,
Type = DateTimePart.Day,
Format = d
}
};
break;
}
case 'F':
case 'f':
{
string f = format.Substring(0, elementLength);
if (elementLength == 1)
{
f = "%" + f;
}
info = new DateTimeInfo
{
IsReadOnly = false,
Type = DateTimePart.Millisecond,
Format = f
};
break;
}
case 'h':
{
string h = format.Substring(0, elementLength);
if (elementLength == 1)
{
h = "%" + h;
}
info = new DateTimeInfo
{
IsReadOnly = false,
Type = DateTimePart.Hour12,
Format = h
};
break;
}
case 'H':
{
string H = format.Substring(0, elementLength);
if (elementLength == 1)
{
H = "%" + H;
}
info = new DateTimeInfo
{
IsReadOnly = false,
Type = DateTimePart.Hour24,
Format = H
};
break;
}
case 'M':
{
string M = format.Substring(0, elementLength);
if (elementLength == 1)
{
M = "%" + M;
}
if (elementLength >= 3)
{
info = new DateTimeInfo
{
IsReadOnly = false,
Type = DateTimePart.MonthName,
Format = M
}
}
;
else
{
info = new DateTimeInfo
{
IsReadOnly = false,
Type = DateTimePart.Month,
Format = M
}
};
break;
}
case 'S':
case 's':
{
string s = format.Substring(0, elementLength);
if (elementLength == 1)
{
s = "%" + s;
}
info = new DateTimeInfo
{
IsReadOnly = false,
Type = DateTimePart.Second,
Format = s
};
break;
}
case 'T':
case 't':
{
string t = format.Substring(0, elementLength);
if (elementLength == 1)
{
t = "%" + t;
}
info = new DateTimeInfo
{
IsReadOnly = false,
Type = DateTimePart.AmPmDesignator,
Format = t
};
break;
}
case 'Y':
case 'y':
{
string y = format.Substring(0, elementLength);
if (elementLength == 1)
{
y = "%" + y;
}
info = new DateTimeInfo
{
IsReadOnly = false,
Type = DateTimePart.Year,
Format = y
};
break;
}
case '\\':
{
if (format.Length >= 2)
{
info = new DateTimeInfo
{
IsReadOnly = true,
Content = format.Substring(1, 1),
Length = 1,
Type = DateTimePart.Other
};
elementLength = 2;
}
break;
}
case 'g':
{
string g = format.Substring(0, elementLength);
if (elementLength == 1)
{
g = "%" + g;
}
info = new DateTimeInfo
{
IsReadOnly = true,
Type = DateTimePart.Period,
Format = format.Substring(0, elementLength)
};
break;
}
case 'm':
{
string m = format.Substring(0, elementLength);
if (elementLength == 1)
{
m = "%" + m;
}
info = new DateTimeInfo
{
IsReadOnly = false,
Type = DateTimePart.Minute,
Format = m
};
break;
}
case 'z':
{
string z = format.Substring(0, elementLength);
if (elementLength == 1)
{
z = "%" + z;
}
info = new DateTimeInfo
{
IsReadOnly = true,
Type = DateTimePart.TimeZone,
Format = z
};
break;
}
default:
{
elementLength = 1;
info = new DateTimeInfo
{
IsReadOnly = true,
Length = 1,
Content = format[0].ToString(),
Type = DateTimePart.Other
};
break;
}
}
_dateTimeInfoList.Add(info);
format = format.Substring(elementLength);
}
}