MVC is a software architecture that divides program elements into functional areas. The model manages data, the view displays it, and the controller processes input. MVC is commonly used in GUI applications and allows for flexibility in modifying components without affecting others. Multiple views and controllers can be used, but changes to the system may require recoding.
Model-view-controller (MVC) is a type of software architecture and design pattern that segments each element of a program into well-defined areas of functionality. In the model-view-controller architecture, the model takes care of all the internal logic of the program that manipulates, saves, retrieves and otherwise manages and calculates the data. The view aspect is responsible for displaying information from the model to the user and also provides a way for the user to provide input to the program. The controller takes input from the view, evaluates it or otherwise processes it, and interacts with the model to change the data or program state, which is ultimately shown to the user through the view. While the model-viewer-controller design requires a program to encapsulate the functionality, the three sections still need to interact with each other in some way and generally depend on each other in some sense, unlike other more aggressive.
Most often, the model-view-controller pattern occurs in applications that maintain a graphical user interface (GUI). Using the MVC pattern, the different visual elements of the GUI are handled by the view, the logging and processing of where and what a user clicks is handled by the controller, and actually changing information or loading information is done by the model. Depending on the exact design of an application, each component of the MVC pattern may have some mechanism for interacting with the other components, for example the model is able to directly instruct the view to update the screen or the view has a way to tell to the controller that is updating the screen and not to accept new input. Unlike some design patterns that take a strict black-box approach, model-view-controller programs tend to be slightly more flexible, although some implementations can make it difficult to modify or debug an MVC program in a modular fashion.
In some cases, the model-view-controller pattern need not contain only one of each component. An example is an application with multiple views, such as multiple monitors, or a display that can be seen on multiple client devices. You can use multiple views and controllers in an application that allows many users to access a database, all responding to a single model. It is more common, however, to design systems that maintain a one-to-one relationship of the model view controller components.
Even though the model view controller components are dependent on each other, it can be much easier to modify some parts of a system that use the MVC template than when no template was used at all, especially in the case of non-models. object-oriented applications. Whether an application uses callbacks or listeners and observers to implement interactions between components, each component can be changed without affecting the other two. This means that a new GUI can be implemented without affecting the model or the controller. It should be noted, however, that fundamental changes to a model-view-controller system may require a small amount of recoding for each individual component.
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