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Although the design pattern is rather old, I dare say that most GUI toolkits rely on a variant of it, such as MVP and MVVM. Qt's MVC variant is called the Model/View which plays a central role in any data-driven Qt application. This post will discuss the importance of this pattern and how it's implemented in the Qt framework. This is the fifth post in the series "Crash course in Qt for C++ developers" covering the MVC or Model/View programming in Qt. Meta-object system (including QObject and MOC).Signals and slots - communication between objects.MVC or rather model/view and delegate programming.Choose your camp Quick/QML-camp or Widgets-camp.How to organise and structure a Qt application.Perhaps you didn't understand any of that. That's absolutely fine! We're just about to explore what it is and why it's useful. Let's start with the purpose - what problem is MVC solving? Obviously, a non-trivial application needs a good architecture to be scalable. And many good architectures are fundamentally based on the SoC principle. By incorporating MVC, the programs are more adaptable to an ever changing specification and can easily be tested and extended with additional functionality. These capabilities are core ingredients in a good architecture formula. Let's see what those concerns are in the MVC pattern. The Controller which handles user inputs and translate those to interactions on the model.īy using this separation, it's easy to change the presentation and the visuals without changing the underlying logic.The View which is the screen representation and renders the model data.It handles the data and logic independently from the user interface. It's also simple to write unit tests targeting the logic without involving the UI. Another benefit of this design is that the same model can be used for multiple views simultaneously without synchronising data.