FTA:
> The isInvokedByMouse was checking whether the click event was invoked by a mouse or touch pointer – rather than a keyboard – by checking if the screenX or screenY coordinates were a positive number.
They were trying to detect whether it was keyboard or mouse activation, and whoever wrote it assumed that screen coordinates of mouse events would always be positive.
But the code shown doesn't do different stuff for Keyboard vs Mouse, it just checks if it is either one of them. Why would you do that? Which other click event types are there that you want to filter?