This problem has been asked quite a few times before, everyone just say to get the plugin mouse and work with it. There is one problem with plugin mouse though, it cannot detect input while you have the mouse inside the plugin widget.
I already use the plugin mouse object for a few things in my plugin, but all of them are only for interacting with the 3D workspace of the game engine. The plugin mouse doesn’t seem to work in the plugin widget itself. I’ve even tried CAS and UIS to detect the mouse, but with no success.
If anyone knows a way to detect mouse input inside the plugin widget, I will really appreciate your help!