static void BuildElementsList(UIElementsList list, DependencyObject over)
{
if(!list.Contains(over))
{
list.Add(over, ContactState.New);
DependencyObject visualParent = over is Visual ? VisualTreeHelper.GetParent(over) : null;
DependencyObject logicalParent = LogicalTreeHelper.GetParent(over);
if(visualParent != null)
BuildElementsList(list, visualParent);
if(logicalParent != null && logicalParent != visualParent)
BuildElementsList(list, logicalParent);
}
}
static void RaiseEnterLeave(Contact contact, UIElementsList list)
{
foreach (DependencyObject treeElement in list)
{
ContactState state = list.GetState(treeElement);
switch (state)
{
case ContactState.New:
RaiseEnterLeaveEvents(contact, treeElement, MultitouchScreen.ContactEnterEvent);
break;
case ContactState.Removed:
RaiseEnterLeaveEvents(contact, treeElement, MultitouchScreen.ContactLeaveEvent);
break;
}
}
}
static UIElementsList BuildElementsList(RawMultitouchReport report, DependencyObject newOver, UIElementsList oldList, out UIElementsList mergedList)
{
UIElementsList newList = null;
if (newOver != null)
{
newList = new UIElementsList(newOver);
if (!report.CleanUp)
BuildElementsList(newList, newOver);
}
mergedList = UIElementsList.BuildDifference(newList, oldList);
return newList;
}