As you have learned about signals and slots, in this section, let's explore how to use a stacked layout in an application that has multiple windows; each window could be either a QWidget or QDialog. Each page may have its own child widgets. The application we are about to develop will demonstrate the use of a stacked layout and how to navigate from one window to the other within the stacked layout.
Figure 5.54
This application is going to require a decent amount of code, hence it is important that we ensure our code is structured carefully so that it meets both the structural and functional quality, avoiding code smells as much as possible.
Let's create four widgets/windows that could be stacked up in a stacked layout, where each page could be developed as a separate class split across two files: HBoxDlg.h and HBoxDlg.cpp and so on.
Let's start with HBoxDlg.h. As you are familiar with layouts, in this exercise, we are going to create each dialog with one...