/// <summary>
/// Enqueues any elements within the specified tree that have invalid measure, arrange, or styles, but
/// were previously removed from the queues as a result of being orphaned by a destroyed window.
/// </summary>
/// <param name="root">The root of the tree to restore.</param>
internal void RestoreToQueues(DependencyObject root)
{
Contract.Require(root, nameof(root));
if (root is UIElement uiElement)
{
if (!uiElement.IsMeasureValid)
{
MeasureQueue.Enqueue(uiElement);
}
if (!uiElement.IsArrangeValid)
{
ArrangeQueue.Enqueue(uiElement);
}
if (!uiElement.IsStyleValid)
{
StyleQueue.Enqueue(uiElement);
}
}
VisualTreeHelper.ForEachChild(root, this, (child, state) =>
{
((PresentationFoundation)state).RestoreToQueues(child);
});
}
/// <summary>
/// Removes all elements associated with the specified view from the Foundation's processing queues.
/// </summary>
/// <param name="view">The view to remove from the queues.</param>
internal void RemoveFromQueues(PresentationFoundationView view)
{
Contract.Require(view, nameof(view));
StyleQueue.Remove(view);
MeasureQueue.Remove(view);
ArrangeQueue.Remove(view);
}
/// <summary>
/// Removes the specified UI element from all of the Foundation's processing queues.
/// </summary>
/// <param name="element">The element to remove from the queues.</param>
internal void RemoveFromQueues(UIElement element)
{
Contract.Require(element, nameof(element));
StyleQueue.Remove(element);
MeasureQueue.Remove(element);
ArrangeQueue.Remove(element);
}
