Action            225 modules/viz/include/opencv2/viz/types.hpp             KeyboardEvent(Action action, const String& symbol, unsigned char code, int modifiers);
Action            227 modules/viz/include/opencv2/viz/types.hpp             Action action;
Action             51 modules/viz/src/types.cpp cv::viz::KeyboardEvent::KeyboardEvent(Action _action, const String& _symbol, unsigned char _code, int _modifiers)