Understanding the mechanism of signals and slots
It is really important to keep your curiosity and to explore what on earth these properties do. However, please remember to revert the changes you made to the app, as we are about to enter the core part of Qt, that is, signals and slots.
Signals and slots are used for communication between objects. The signals and slots mechanism is a central feature of Qt and probably the part that differs the most from the features provided by other frameworks.
Have you ever wondered why a window closes after the Close button is clicked on? Developers who are familiar with other toolkits would say that the Close button being clicked on is an event, and this event is bound with a callback function that is responsible ...