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);
}
private static Visual FindLastTarget(Visual scope, Stop currentStop, DependencyProperty navigationModeProperty, IStopComparerProvider stopComparerProvider)
{
return(GetNavigation(scope, navigationModeProperty).FindLastTarget(scope, currentStop, navigationModeProperty, stopComparerProvider));
}
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);
}
public override Visual FindPreviousTarget(Visual scope, Stop currentStop, DependencyProperty navigationModeProperty, IStopComparerProvider stopComparerProvider)
{
return(KeyboardNavigationTarget.FindPreviousContainedTarget(scope, currentStop, navigationModeProperty, stopComparerProvider) ??
(scope.VisualParent != null ? KeyboardNavigationTarget.FindPreviousTarget(scope.VisualParent, new Stop(currentStop.Element, KeyboardNavigation.GetTabIndex(scope)), navigationModeProperty, stopComparerProvider) : null)); // translate currentStop and forward request to parent
}
public override Visual FindLastTarget(Visual scope, Stop currentStop, DependencyProperty navigationModeProperty, IStopComparerProvider stopComparerProvider)
{
return(KeyboardNavigationTarget.FindLastContainedTarget(scope, currentStop, navigationModeProperty, stopComparerProvider));
}
public override Visual FindPreviousTarget(Visual scope, Stop currentStop, DependencyProperty navigationModeProperty, IStopComparerProvider stopComparerProvider)
{
return(KeyboardNavigationTarget.FindPreviousContainedTarget(scope, currentStop, navigationModeProperty, stopComparerProvider) ?? currentStop.Element); // stay at the edge
}
public override Visual FindPreviousTarget(Visual scope, Stop currentStop, DependencyProperty navigationModeProperty, IStopComparerProvider stopComparerProvider)
{
// forward the request to the parent
return(scope.VisualParent != null?KeyboardNavigationTarget.FindPreviousTarget(scope.VisualParent, currentStop, navigationModeProperty, stopComparerProvider) : null);
}
public virtual Visual FindLastTarget(Visual scope, Stop currentStop, DependencyProperty navigationModeProperty, IStopComparerProvider stopComparerProvider)
{
return(scope.VisualParent != null?
KeyboardNavigationTarget.FindLastTarget(scope.VisualParent, currentStop, navigationModeProperty, stopComparerProvider) :
KeyboardNavigationTarget.FindLastContainedTarget(scope, currentStop, navigationModeProperty, stopComparerProvider));
}
