Input event type for mouse button events. Contains mouse click informations. See [method Node._input]. http://docs.godotengine.org/en/stable/learning/features/inputs/inputevent.html Mouse button identifier, one of the BUTTON_* or BUTTON_WHEEL_* constants in [@GlobalScope]. If [code]true[/code] the mouse button's state is a double-click. If [code]false[/code] the mouse button's state is released. TO TALK in PR, reduz said : i think it's used for apple touch but i don't remember what it does If [code]true[/code] the mouse button's state is pressed. If [code]false[/code] the mouse button's state is released.