In Chapter 3, Qt GUI Programming, we edited predefined properties of widgets in the form editor and used their getter and setter methods in the code. However, until now, there wasn't a real reason for us to declare a new property. It'll be useful with the Animation framework, so let's pay more attention to properties.
Only classes that inherit QObject can declare properties. To create a property, we first need to declare it in a private section of the class (usually right after the Q_OBJECT mandatory macro) using a special Q_PROPERTY macro. That macro allows you to specify the following information about the new property:
- The property name—a string that identifies the property in the Qt meta system.
- The property type—any valid ...
