How to make fade between button styles?

[anonymous_user_3d74ad30]

I have set up 4 images for 4 button styles - normal, hovered, pressed, and disabled.
I want to have fade like this one.
How to make that fade without messing up with dynamic materials or making all functional manually? Is there that way?

[Everynone]

The effect you’ve linked can be very easily achieved with widget animation.