///<summary>
/// Initiate the processing for Loaded event broadcast starting at this node
/// </summary>
/// <remarks>
/// This method is to allow firing Loaded event from a Helper class since the override is protected
/// </remarks>
internal void FireLoadedOnDescendentsInternal()
{
// This is to prevent duplicate Broadcasts for the Loaded event
if (LoadedPending == null)
{
DependencyObject parent = Parent;
if (parent == null)
{
parent = VisualTreeHelper.GetParent(this);
}
// Check if this Loaded cancels against a previously queued Unloaded event
// Note that if the Loaded and the Unloaded do not change the position of
// the node within the loagical tree they are considered to cancel each other out.
object[] unloadedPending = UnloadedPending;
if (unloadedPending == null || unloadedPending[2] != parent)
{
// Add a callback to the MediaContext which will be called
// before the first render after this point
BroadcastEventHelper.AddLoadedCallback(this, parent);
}
else
{
// Dequeue Unloaded
BroadcastEventHelper.RemoveUnloadedCallback(this, unloadedPending);
}
}
}