Type Definition opencv::highgui::ButtonCallback

type ButtonCallback = Option<Box<dyn FnMut(i32) + Send + Sync + 'static>>;

Callback function for a button created by cv::createButton

Parameters

• state: current state of the button. It could be -1 for a push button, 0 or 1 for a check/radio box button.
• userdata: The optional parameter.