private void PeriodListSnapped_ItemClick(object sender, ItemClickEventArgs e)
{
try
{
DateTime nav = ((DateTime)((e.ClickedItem as Viewbox).DataContext));
CalculateDateDifference dateDiff;
// if the month has NOT already been loaded, load into memory
if (!isMonthLoaded(nav.Year, nav.Month))
{
// since this is specific to months in the future we only need to see
// where it is relative to our last month
DateTime last = new DateTime(_allMonths.Last().Year, _allMonths.Last().Month, 1);
// get the difference
dateDiff = new CalculateDateDifference(last, nav);
// now add all the months to the flipview
for (int i = 0; i < dateDiff.Months; i++)
{
last = last.AddMonths(1);
AddMonthToCal(last.Year, last.Month);
}
}
// now that it's loaded, navigate to it
// first determine which month we're at
CalendarMonth curMonth = (CalendarFlip.SelectedItem as CalendarMonth);
DateTime curDate = new DateTime(curMonth.Year, curMonth.Month, 1);
// then determine how many months we need to move (not specific to forward or back)
dateDiff = new CalculateDateDifference(curDate, nav);
// then determine if the current month is ahead or behind where we need to go
int compare = curMonth.Compare(nav.Year, nav.Month);
// if we're trying to navigate to the current month we're at... gtfo
if (compare == 0)
{
return;
}
else if (compare > 0) // the current month is further than where we want to nav... go back
{
CalendarFlip.SelectedIndex -= dateDiff.Months;
}
else // the navigation point is further than where we're at... go forward
{
CalendarFlip.SelectedIndex += dateDiff.Months;
}
}
catch { }
}
/// <summary>
/// Add a single month to the UI and underlying calendar
/// </summary>
/// <param name="Year">The current Year as int</param>
/// <param name="Month">The current Month as int</param>
/// <returns>True if the add was successfull, false if the month already existed in the list</returns>
private CalendarMonth AddMonthToCal(int Year, int Month)
{
bool toFront = false;
CalendarMonth returnMonth = null;
// determine if this month should go in the front or back
// we always assume the caller has given us either the next
// or previous month... we do no validation
if (_allMonths == null || _allMonths.Count == 0)
{
toFront = false;
}
else
{
CalendarMonth first = _allMonths[0];
if (first.Compare(Year, Month) > 0)
{
toFront = true;
}
else
{
toFront = false;
}
}
if (toFront)
{
// figure out how much time from today to this value "in the past"
TimeSpan ts = DateTime.Today - new DateTime(Year, Month, 1);
// if it's too far back don't add it
if (Math.Abs(ts.Days) > Period.DAYS_IN_YEAR * Period.YEARS_BACK)
{
return(returnMonth);
}
}
else
{
// figure out how much time from today to this value "in the past"
TimeSpan ts = DateTime.Today - new DateTime(Year, Month, 1);
// if it's too far back don't add it
if (Math.Abs(ts.Days) > Period.DAYS_IN_YEAR * Period.YEARS_FORWARD)
{
return(returnMonth);
}
}
// if this month isn't already loaded, add it
if (!isMonthLoaded(Year, Month))
{
CalendarMonth cm = new CalendarMonth(Year, Month);
// ensure the proper colors are added to it with the
// most recent period
if (mostRecentPeriod != null)
{
Add_Period_To_Calendar(mostRecentPeriod, cm);
}
// ensure the calendar is appropriate to the current
// view mode (snapped vs normal)
if (App.isSnapped())
{
cm.SnapView();
}
if (toFront)
{
_allMonths.Insert(0, cm);
}
else
{
_allMonths.Add(cm);
}
_changingSelection = true;
CalendarFlip.ItemsSource = _allMonths;
_changingSelection = false;
returnMonth = cm;
}
return(returnMonth);
}