Function uiButtonOnClicked 

pub unsafe extern "C" fn uiButtonOnClicked(
    b: *mut uiButton,
    f: Option<unsafe extern "C" fn(sender: *mut uiButton, senderData: *mut c_void)>,
    data: *mut c_void,
)

Registers a callback for when the button is clicked.

@param b uiButton instance. @param f Callback function.\n @p sender Back reference to the instance that triggered the callback.\n @p senderData User data registered with the sender instance. @param data User data to be passed to the callback.

@note Only one callback can be registered at a time. @memberof uiButton