MouseButton       250 modules/viz/include/opencv2/viz/types.hpp             MouseEvent(const Type& type, const MouseButton& button, const Point& pointer, int modifiers);
MouseButton       253 modules/viz/include/opencv2/viz/types.hpp             MouseButton button;
MouseButton        54 modules/viz/src/types.cpp cv::viz::MouseEvent::MouseEvent(const Type& _type, const MouseButton& _button, const Point& _pointer, int _modifiers)