private static Visual FindPreviousContainedTarget(Visual scope, Stop currentStop, DependencyProperty navigationModeProperty, IStopComparerProvider stopComparerProvider)
{
IComparer <Stop> stopComparer = stopComparerProvider.CreateComparer(currentStop);
bool passedCurrentStop = false;
Stop targetStop = null;
foreach (Stop stop in GetContainedStops(scope, currentStop.Element, navigationModeProperty))
{
if (stop.Element == currentStop.Element)
{
passedCurrentStop = true;
continue;
}
int compareResult = stopComparer.Compare(currentStop, stop);
if ((compareResult > 0 || compareResult == 0 && !passedCurrentStop) && // select stops with priority lower than currentStop, or the same priority before currentStop
(targetStop == null || stopComparer.Compare(targetStop, stop) <= 0))
{
targetStop = stop;
}
}
return(targetStop != null ? targetStop.Element : null);
}
private static Visual FindLastContainedTarget(Visual scope, Stop currentStop, DependencyProperty navigationModeProperty, IStopComparerProvider stopComparerProvider)
{
IComparer <Stop> stopComparer = stopComparerProvider.CreateComparer(currentStop);
Stop targetStop = null;
foreach (Stop stop in GetContainedStops(scope, currentStop.Element, navigationModeProperty))
{
if (targetStop == null || stopComparer.Compare(targetStop, stop) <= 0)
{
targetStop = stop;
}
}
return(targetStop != null ? targetStop.Element : null);
}