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Another benefit of this design is that the same model can be used for multiple views simultaneously without synchronising data. It's also simple to write unit tests targeting the logic without involving the UI. 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. Let's see what those concerns are in the MVC pattern. These capabilities are core ingredients in a good architecture formula. By incorporating MVC, the programs are more adaptable to an ever changing specification and can easily be tested and extended with additional functionality. And many good architectures are fundamentally based on the SoC principle. Let's start with the purpose - what problem is MVC solving? Obviously, a non-trivial application needs a good architecture to be scalable. That's absolutely fine! We're just about to explore what it is and why it's useful. Perhaps you didn't understand any of that.
#Qt json editor how to#
#Qt json editor series#
This is the fifth post in the series "Crash course in Qt for C++ developers" covering the MVC or Model/View programming in Qt. This post will discuss the importance of this pattern and how it's implemented in the Qt framework. Qt's MVC variant is called the Model/View which plays a central role in any data-driven Qt application. 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. MVC originates from smalltalks, and was formulated by Trygve Reenskaug. In other words, each component: the Model, the View and the Controller are addressing different concerns, which give developers a greater flexibility and reusage. Separation of Concerns? Essentially MVC is a design pattern used in GUI applications which follows the SoC principle by isolating and decoupling different components. But perhaps you've heard of the SoC principle, i.e. Have you ever heard of Model- View- Controller, or MVC for short? If not - not to worry - as you might have never worked with a GUI toolkit before.