How do I handle Canvas.Top change event in WPF?

Question

I have an element positioned on Canvas using attached properties Canvas.Top and Canvas.Left. Then using animations the element is move

Answer 1

One can catch attached property changed event using DependencyPropertyDescriptor's AddValueChanged method:

var descriptor 
    = DependencyPropertyDescriptor.FromProperty( 
        Canvas.LeftProperty, typeof( YourControlType ) 
      );
descriptor.AddValueChanged( this, OnCanvasLeftChanged );