Learning OpenCV 4 Computer Vision with Python 3 - Third Edition

Abstracting a window and keyboard with managers.WindowManager

As we have seen, OpenCV provides functions that cause a window to be created, be destroyed, show an image, and process events. Rather than being methods of a window class, these functions require a window's name to pass as an argument. Since this interface is not object-oriented, it is arguably inconsistent with OpenCV's general style. Also, it is unlikely to be compatible with other window-or event-handling interfaces that we might eventually want to use instead of OpenCV's.

For the sake of object orientation and adaptability, we abstract this functionality into a WindowManager class with the createWindow, destroyWindow, show, and processEvents methods. As a property, WindowManager ...