The mouse button that triggered the event.
Valid if and only if Efl.Input.Pointer.value_has(button) is true.
button
true
Since 1.23
@property button { get {} set {} values { but: int; } }
int efl_input_pointer_button_get(const Eo *obj); void efl_input_pointer_button_set(Eo *obj, int but);