private void AddChildren(GeneratorPosition pos, int itemCount)
{
Debug.Assert(_itemContainerGenerator != null, "Encountered a null _itemContainerGenerator while receiving an Add action from a generator.");
IItemContainerGenerator generator = (IItemContainerGenerator)_itemContainerGenerator;
using (generator.StartAt(pos, GeneratorDirection.Forward))
{
for (int i = 0; i < itemCount; i++)
{
UIElement e = generator.GenerateNext() as UIElement;
if(e != null)
{
_uiElementCollection.InsertInternal(pos.Index + 1 + i, e);
generator.PrepareItemContainer(e);
}
else
{
_itemContainerGenerator.Verify();
}
}
}
}
// This is internal as an optimization for VirtualizingStackPanel (so it doesn't need to re-query InternalChildren repeatedly)
internal static void InsertInternalChild(UIElementCollection children, int index, UIElement child)
{
children.InsertInternal(index, child);
}
// This is internal as an optimization for VirtualizingStackPanel (so it doesn't need to re-query InternalChildren repeatedly)
internal static void InsertInternalChild(UIElementCollection children, int index, UIElement child)
{
children.InsertInternal(index, child);
}