private void updateLine(TransitLine updatedLine, TransitLineViewModel lineToUpdate = null)
{
if (lineToUpdate == null)
lineToUpdate = Lines.Single(line => line.Equals(updatedLine));
// Remove arrivals that are not there in the model
// .ToList() makes a copy of the collection to iterate over
foreach (var existingArrival in lineToUpdate.Arrivals.ToList())
{
if (!updatedLine.Arrivals.Contains(existingArrival.ArrivalTime))
{
lineToUpdate.Arrivals.Remove(existingArrival);
}
}
// Add arrivals that are not there in the viewmodel
foreach (var arrivalInModel in updatedLine.Arrivals)
{
if (!lineToUpdate.Arrivals.Any(a => a.ArrivalTime == arrivalInModel))
{
var newArrival = getNewArrival(arrivalInModel, updatedLine.WalkTime);
if (newArrival.WhenINeedToLeave < BUS_CUTOFF)
{
continue;
}
var insertionPoint = lineToUpdate.Arrivals.Count(a => a.ArrivalTime < arrivalInModel);
lineToUpdate.Arrivals.Insert(insertionPoint, newArrival);
}
}
updateTimestamp();
}
/// <summary>
/// The first time a viewmodel is hooked up to the model,
/// populate the Lines collection with lines from the model
/// </summary>
private void updateLines()
{
var newLines = new ObservableCollection<TransitLineViewModel>();
foreach (var line in model.Lines)
{
var newLineViewModel = new TransitLineViewModel()
{
RouteName = line.RouteName,
StopName = line.StopName,
Arrivals = new ObservableCollection<ArrivalViewModel>(),
};
updateLine(line, newLineViewModel);
newLines.Add(newLineViewModel);
}
Lines = newLines;
updateTimestamp();
}