private static Func <DependencyObject, bool> GetTemplatedDescendantExpandPredicate(IDataGridItemContainer source)
{
var fe = source as FrameworkElement;
if (fe == null)
{
throw new ArgumentException("The source object must be a FrameworkElement.", "source");
}
return(( DependencyObject item ) => IDataGridItemContainerExtensions.IsPartOfTargetTemplate(item, fe));
}
internal static IEnumerable <IDataGridItemContainer> GetTemplatedChildDataGridItemContainers(this IDataGridItemContainer source)
{
if (source == null)
{
throw new ArgumentNullException("source");
}
var predicate = IDataGridItemContainerExtensions.GetTemplatedChildExpandPredicate(source);
return(IDataGridItemContainerExtensions.GetChildDataGridItemContainers(source, predicate));
}
private static IEnumerable <IDataGridItemContainer> GetChildDataGridItemContainers(IDataGridItemContainer source, Func <DependencyObject, bool> expand)
{
Debug.Assert(source != null);
var root = source as DependencyObject;
if (root == null)
{
throw new ArgumentException("The source object must be a DependencyObject.", "source");
}
return(IDataGridItemContainerExtensions.GetChildDataGridItemContainers(root, expand));
}
private static bool IsPartOfTargetTemplate(DependencyObject element, FrameworkElement target)
{
while (element != null)
{
var templatedParent = IDataGridItemContainerExtensions.GetTemplatedParent(element);
if (templatedParent == target)
{
return(true);
}
element = templatedParent;
}
return(false);
}