Suggest an editImprove this articleRefine the answer for “Tell me about the MVP approach.”. Your changes go to moderation before they’re published.Approval requiredContentWhat you’re changing🇺🇸EN🇺🇦UAPreviewTitle (EN)Short answer (EN)**MVP (Model-View-Presenter)** is an architectural pattern that emerged as a development of **MVC** to better separate responsibility between the interface and the logic, especially in **interactive UI applications** (mobile, desktop, web). **Key point:** the View knows nothing about the data, the Model knows nothing about the interface, and the **Presenter** coordinates everything between them - the main idea is to fully isolate logic from the View.Shown above the full answer for quick recall.Answer (EN)Image**MVP (Model-View-Presenter)** is an architectural pattern that emerged as a development of **MVC** to better separate responsibility between the interface and the logic, especially in **interactive UI applications** (mobile, desktop, web). The main idea is to fully **isolate logic from the View**, so that the interface becomes "dumb" and can be tested without a UI. --- ### 1. Main components #### **Model** - Responsible for **data** and **business logic**. - Stores information, performs queries, processes rules. - Does not know who or how will show this data. *Example:* a `UserModel` class with `getUser()`, `saveUser()` methods. --- #### **View** - Responsible **only for displaying the interface**. - Contains no business logic and does not control the Model directly. - Has an **interface (contract)** through which the Presenter works with it. *Example:* a login screen with `showLoading()`, `showError()`, `showUserInfo()` methods. --- #### **Presenter** - The central element, an analog of the controller in MVC, but smarter. - Manages the interaction between the View and the Model. - Receives events from the View (for example, "the user clicked a button"), calls the needed Model methods, processes the response, and passes the result back to the View. - Does not know *exactly how* the View is built; it works only through the interface. *Example:* `LoginPresenter` listens to the "Log in" button, calls `AuthModel.login()`, and depending on the result calls `view.showSuccess()` or `view.showError()`. --- ### 2. How it works ```javascript User ↓ View ───▶ Presenter ───▶ Model ◀────────────── (data update) ``` 1. The user performs an action (for example, clicking a button). 2. The View passes the event to the Presenter. 3. The Presenter calls the Model and gets a result. 4. The Presenter tells the View what and how to display. --- ### 3. Main differences from MVC | Parameter | MVC | MVP | |---|---|---| | Controller | Directs the data flow | The Presenter manages logic and the View | | View | Can turn to the Model directly | Works only through the Presenter | | Interaction | View ↔ Controller ↔ Model | View → Presenter → Model → Presenter → View | | Testability | Medium | High (the View can be replaced with mocks) | --- ### 4. Variants of MVP - **Passive View** - the View is as "dumb" as possible, only showing data (ideal for tests). - **Supervising Presenter** - part of the logic (for example, data bindings) stays in the View, and the Presenter controls the overall processes. --- ### 5. Advantages of MVP **Good testability** - the Presenter can be tested without a UI. **Separation of concerns** - the interface contains no logic. **Flexibility** - the View is easy to change (for example, replacing a web interface with a mobile one). **Simplified maintenance** - the layers are independent and readable. --- ### 6. Drawbacks More code (interfaces, contracts, connections). With a large UI, there is a risk of the Presenter "growing out of control". Requires discipline in separating roles. --- ### 7. Where MVP is used - **Android applications** (before the move to MVVM, Google recommended MVP) - **Desktop applications** (WinForms, Swing, Qt) - Web applications with JavaScript frameworks before reactive models appeared (Knockout, early versions of AngularJS). --- **Summary:** > **MVP** is a logically clean descendant of MVC: > the View knows nothing about the data, > the Model knows nothing about the interface, > and the **Presenter** coordinates everything between them. > > The result is code that is easy to test, maintain, and evolve.For the reviewerNote to the moderator (optional)Visible only to the moderator. Helps review go faster.