Returns whether a mouse button is being held down.
isDown = IsMouseButtonDown([button])
- string? - Name of the button. If not passed, then it returns if any mouse button is pressed.
["LeftButton", "RightButton", "MiddleButton", "Button4", "Button5"]
- boolean - Returns whether the given mouse button is held down.
- Patch 2.0.1 (2006-12-05): Added.