protected virtual void UnsubscribeFromEvents(ToolKitMediaElement element)
{
if (element == null)
{
return;
}
element.PropertyChanged -= OnElementPropertyChanged;
element.SeekRequested -= SeekRequested;
element.StateRequested -= StateRequested;
element.PositionRequested -= OnPositionRequested;
}
void IVisualElementRenderer.SetElement(VisualElement element)
{
if (element == null)
{
throw new ArgumentNullException(nameof(element));
}
if (!(element is ToolKitMediaElement))
{
throw new ArgumentException($"{nameof(element)} must be of type {nameof(MediaElement)}");
}
var oldElement = MediaElement;
MediaElement = (ToolKitMediaElement)element;
if (oldElement != null)
{
UnsubscribeFromEvents(oldElement);
}
var currentColor = oldElement?.BackgroundColor ?? Color.Default;
if (element.BackgroundColor != currentColor)
{
UpdateBackgroundColor();
}
if (MediaElement != null)
{
MediaElement.PropertyChanged += OnElementPropertyChanged;
MediaElement.SeekRequested += SeekRequested;
MediaElement.StateRequested += StateRequested;
MediaElement.PositionRequested += OnPositionRequested;
}
// Can't set up the tracker in the constructor because it access the Element (for now)
if (tracker == null)
{
SetTracker(new VisualElementTracker(this));
}
OnElementChanged(new ElementChangedEventArgs <MediaElement>(oldElement, MediaElement));
}
