// Helper method used from GetNeighborSelectionStop()
// Returns a parent DependencyObject of the specified element that is
//
// * Visible AND
// * ( Marked with a SelectionStop OR
// * Marked with IsSelectionScope = true OR
// * Has more than one child )
//
private static DependencyObject GetEligibleParent(DependencyObject element, out int childIndex, out int childrenCount, out int childDepth, out bool isSelectionStop, out bool isSelectionScope)
{
childDepth = 0;
isSelectionStop = false;
isSelectionScope = false;
bool isVisible;
do
{
element = VisualTreeUtils.GetIndexedVisualParent(element, out childrenCount, out childIndex);
isSelectionStop = element == null ? false : (GetSelectionStop(element) != null);
isSelectionScope = element == null ? false : GetIsSelectionScope(element);
isVisible = VisualTreeUtils.IsVisible(element as UIElement);
childDepth++;
}while (
element != null &&
(isVisible == false ||
(isSelectionStop == false &&
isSelectionScope == false &&
childrenCount < 2)));
return(element);
}
