internal virtual void GenerateChildren()
{
// This method is typically called during layout, which suspends the dispatcher.
// Firing an assert causes an exception "Dispatcher processing has been suspended, but messages are still being processed."
// Besides, the asserted condition can actually arise in practice, and the
// code responds harmlessly.
//Debug.Assert(_itemContainerGenerator != null, "Encountered a null _itemContainerGenerator while being asked to generate children.");
IItemContainerGenerator generator = (IItemContainerGenerator)_itemContainerGenerator;
if (generator != null)
{
using (generator.StartAt(new GeneratorPosition(-1, 0), GeneratorDirection.Forward))
{
UIElement child;
while ((child = generator.GenerateNext() as UIElement) != null)
{
_uiElementCollection.AddInternal(child);
generator.PrepareItemContainer(child);
}
}
}
}
// This is internal as an optimization for VirtualizingStackPanel (so it doesn't need to re-query InternalChildren repeatedly)
internal static void AddInternalChild(UIElementCollection children, UIElement child)
{
children.AddInternal(child);
}
// This is internal as an optimization for VirtualizingStackPanel (so it doesn't need to re-query InternalChildren repeatedly)
internal static void AddInternalChild(UIElementCollection children, UIElement child)
{
children.AddInternal(child);
}