C++ Reactive Programming

Qt event model with signals/slots/MOC – an example

In this section, we will create an application to handle mouse events in QLabel. We will override the mouse events in a custom QLabel and handle them in the dialog where the custom label is placed. The approach to this application is as follows:

1. Create a custom my_QLabel class, inherited from the framework QLabel class, and override the mouse events, such as mouse-move, mouse-pressed, and mouse-leave.
2. Define the signals that correspond to these events in my_QLabel, and emit them from the corresponding event handlers.
3. Create a dialog class inherited from the QDialog class, and handcode the positions and layouts of all of the widgets, including the custom widget created to handle mouse events. ...