protected virtual void Dispose(bool disposing)
{
if (_disposed)
{
return;
}
_disposed = true;
if (disposing)
{
SetElement(_element, null);
if (_renderer != null)
{
_renderer.ElementChanged -= RendererOnElementChanged;
if (_renderer.View.IsAlive() && _attachTracker.IsAlive())
{
_renderer.View.RemoveOnAttachStateChangeListener(_attachTracker);
_attachTracker = null;
}
_renderer = null;
_context = null;
}
}
}
public VisualElementTracker(IVisualElementRenderer renderer)
{
_batchCommittedHandler = HandleRedrawNeeded;
_propertyChangedHandler = HandlePropertyChanged;
_renderer = renderer ?? throw new ArgumentNullException(nameof(renderer));
_context = renderer.View.Context;
_renderer.ElementChanged += RendererOnElementChanged;
VisualElement view = renderer.Element;
SetElement(null, view);
renderer.View.SetCameraDistance(3600);
if (!_context.IsDesignerContext())
{
_attachTracker = AttachTracker.Instance;
renderer.View.AddOnAttachStateChangeListener(_attachTracker);
}
else
{
_attachTracker = new AttachTracker();
}
}