[UMG] How can i make has-shape widget button, with perfect interaction?

This seems to work:

I wanna make shape button, like star or triangle, which can interact if input area’s alpha !=0 else does not interact when alpha ==0. How can i make it? Can i make it by only blueprint?

Thank you so much bro:)

I’m so glad cuz I struggled this problem for several year!

Have a nice day!