public static UIElementsList BuildDifference(UIElementsList newList, UIElementsList oldList)
{
if (oldList == null)
{
return(newList);
}
if (newList == null)
{
return(null);
}
UIElementsList result = new UIElementsList(oldList.NewOver);
result.list.AddRange(oldList.list);
foreach (DependencyObject obj in oldList.list)
{
result.states.Add(obj, ContactState.Removed);
}
result.NewOver = newList.NewOver;
foreach (DependencyObject obj in newList.list)
{
if (result.states.ContainsKey(obj))
{
result.states[obj] = ContactState.Moved;
}
else
{
result.list.Add(obj);
result.states.Add(obj, ContactState.New);
}
}
return(result);
}
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);
}
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 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);
}
}
}