How do I create a Drag & Drop that doesn't drag forever!

Hello everyone!

I am currently creating a Joy Stick for a game, and I want my Joystick to be closed off in an invisible box so the user can drag it to a certain point only.
So for example

Here I wan't the joy stick to be dragged inside that box*



I tried using the Solid Behaviour but that didn't work for me!
So now users can drag the Joystick all over the screen




& here is my code


Thanks everyone!

EDIT:

Was able to find a solution!
Thanks.

you can invert the event. or use enabled. and disabled