lock drag drop sprite

I am creating an application that should work like this: there sprites with drag drop behavior. And the screen there sprties the square, where to place the sprites with drag drop, when put in the right sprite wanted to lock them with drag drop on the screen

on drop

if sprite1 overlaps sprite2

sprite1 set position to spirte2

sprite1 set drag&drop disabled

I need the lock happens when a sprite is on top of another

so just use the condition: isOverlapping

or you can check the distance between them

if distance(sprite1.x,sprite1.y,spirte2.x,spirte2.y) < 20