public static T FindLogicalAncestor <T>(DependencyObject obj, Func <T, bool> filter = null) where T : DependencyObject
{
filter = filter ?? (depObj => true);
while (obj != null)
{
T o = obj as T;
if (o != null && filter(o))
{
return(o);
}
obj = LogicalTreeHelper.GetParent(obj);
if (obj != null && UIEventHubProperties.GetSkipLookup(obj))
{
obj = null;
}
}
return(default(T));
}
//http://stackoverflow.com/questions/665719/wpf-animate-listbox-scrollviewer-horizontaloffset
public static T FindVisualChild <T>(DependencyObject obj,
Func <T, bool> filter = null, int level = -1) where T : DependencyObject
{
if (filter == null)
{
filter = (t) => true;
}
// Search immediate children first (breadth-first)
for (int i = 0; i < VisualTreeHelper.GetChildrenCount(obj); i++)
{
DependencyObject child = VisualTreeHelper.GetChild(obj, i);
if (child != null && child is T && filter((T)child))
{
return((T)child);
}
else
{
if (level == -1 || level > 0)
{
if (!UIEventHubProperties.GetSkipLookup(child))
{
T childOfChild = FindVisualChild <T>(child, filter, level == -1 ? -1 : level - 1);
if (childOfChild != null)
{
return(childOfChild);
}
}
}
//else
// Debug.WriteLine(child);
}
}
return(null);
}
