Getting Started with Qt 5: Introduction to programming Qt 5 for

Back in your Qt program, that Qt signal gets emitted and then received by your Qt slot function, where you can safely do whatever Qt stuff you weren't allowed

Qt 5 Design Patterns on Udemy courseqt-5-design-patterns

signal slot Define your own class with Qt signals and slots: To provide a class with its own signals and slots, the following applies Rules to be followed:

signal slot qt Qt's signals and slots mechanism ensures that if you connect a signal to a slot, the slot will be called with the signal's parameters at the right time