C++ Programming By Example - Creating Your Own Qt5 Widget

The video tutorial guides viewers through creating a custom QT5 widget by subclassing the QWidget class. It covers setting up necessary files, updating the CMake file, and implementing the Paint Widget class with a constructor. The tutorial also explains how to override the paint event function and integrate the Paint Widget into the UI using QCreator and Visual Studio. The video concludes with a preview of extending the custom widget to react to user input in the next video.

What is the first step in creating a custom QT5 widget?

• Compile the existing code

• Add a new header and source file

• Create a new project in Visual Studio

• Write the main function

Why is it important for the PaintWidget to have a parent?

• To ensure it has a unique identifier

• To manage the lifetime of the object and avoid memory leaks

• To allow it to be displayed in the UI

• To enable it to inherit properties from other widgets

What is the purpose of overriding the paint event function in the PaintWidget class?

• To change the widget's size

• To improve the widget's performance

• To add new menu items

• To provide custom logic for handling painting

How do you promote a base QWidget to a custom PaintWidget in Qt Creator?

• By renaming the QWidget

• By clicking 'promote to' and selecting PaintWidget

• By recompiling the project

• By editing the main.cpp file

What happens when you promote a QWidget to a PaintWidget?

• The QWidget is deleted

• The PaintWidget is added to the project

• The base QWidget is changed to an instance of PaintWidget

• The project is automatically compiled

What is the benefit of integrating the PaintWidget into the UI?

• It reduces the size of the project

• It simplifies the code structure

• It enables automatic propagation of code updates to the UI

• It allows for easier debugging

What is the next step after integrating the PaintWidget into the UI?

• Create a new class

• Add more widgets

• Compile the project

• Start reacting to user input and drawing on the screen