/// <summary>
/// Assumes there's at least one week day selected if using weekly
/// </summary>
/// <param name="viewModel"></param>
/// <param name="userPickedStartDate"></param>
public DateOccurrenceEnumerator(RecurrenceControlViewModel viewModel, DateTime userPickedStartDate)
{
_viewModel = viewModel;
_repeatInterval = viewModel.GetRepeatIntervalAsNumber();
_sortedRepeatDays = viewModel.GetSelectedDaysOfWeek();
// Get the actual start date
_startDate = viewModel.GetStartDate(userPickedStartDate);
}
public bool MoveNext()
{
// If limiting by occurrences and we've reached the limit
if (_viewModel.IsEndOccurrencesChecked && _countSoFar >= _viewModel.GetEndOccurrencesAsNumber())
{
return(false);
}
DateTime prospectiveNextDate;
// If first
if (_countSoFar == 0)
{
prospectiveNextDate = _startDate;
}
else
{
switch (_viewModel.SelectedRepeatOption)
{
case RepeatOptions.Daily:
prospectiveNextDate = _startDate.AddDays(_repeatInterval * _countSoFar).Date;
break;
case RepeatOptions.Weekly:
// If only one day repeating on, that's easy
if (_sortedRepeatDays.Length == 1)
{
prospectiveNextDate = Current.AddDays(_repeatInterval * 7);
}
else
{
DateTime value;
// If not repeating every week and we're on the last day, jump ahead
// Note that this would be slightly wrong in countries where the first day isn't Sunday
if (_repeatInterval > 1 && Current.DayOfWeek == _sortedRepeatDays.Last())
{
value = Current.AddDays(8);
}
else
{
// Otherwise we just jump ahead 1 and then look for the next
value = Current.AddDays(1);
}
prospectiveNextDate = _viewModel.GetStartDate(value);
}
break;
case RepeatOptions.Monthly:
prospectiveNextDate = _startDate.AddMonths((int)_repeatInterval * _countSoFar).Date;
break;
default:
throw new NotImplementedException("Unknown repeat option");
}
}
// If limiting by end date, check that
if (_viewModel.IsEndDateChecked)
{
if (prospectiveNextDate > _viewModel.EndDate)
{
return(false);
}
}
// Otherwise we're good! Continue!
_countSoFar++;
Current = prospectiveNextDate;
return(true);
}