MVVM ( Model View ViewModel )
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The document provides an overview of the traditional UI development approach and introduces the Model-View-ViewModel (MVVM) architectural pattern. It defines the key components of MVVM - the Model, View, and ViewModel - and describes how they interact through data binding, commands, and notifications. The summary highlights MVVM's separation of concerns, support for independent development and testing of components, and facilitation of UI redevelopment.
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MVVM ( Model View ViewModel )
- 1. What? and Why ?
- 2. Agenda Intro : Traditional UI development. MVVM in Deep : What is MVVM? Model / View Model /View. Classes interaction . MVVM and other patterns. MVVM Advantages /Disadvantages. MVVM in Android. Conclusion & Recommendations.
- 3. Traditional UI Development Simple , no problem
- 4. Traditional UI Development More work , more problems
- 5. Traditional UI Development Model View UI Layout Code behind Domain objects Update and get data
- 6. Traditional UI Development Constraints: Difficult to Test Encourages using UI as data storage Complex classes and a huge mount of code. No code sharing . very strong dependency between UI & logic. What if you need to redesign UI?
- 7. What ? And How?
- 8. What is MVVM? The Model View ViewModel. Introduced by Microsoft in 2006. Not a design pattern it is an architectural pattern. It is a specialization of the presentation model pattern.
- 9. MVVM In Deep Components to be swapped Internal implementation to be changed without affecting the others Components to be worked on independently Isolated unit testing
- 10. MVVM In Deep
- 11. Model Non-visual classes that encapsulate the application's data and business logic. Can’t See View Model or View. Should not contain any use case–specific or user task–specific behavior or application logic. Notifies other components of any state changes. May provide data validation and error reporting
- 12. View Model Non-visual class encapsulates the presentation logic required. Can’t See View (no direct Reference). Coordinates the view's interaction with the model. May provide data validation and error reporting. Notifies the view of any state changes.
- 13. View Visual element defines the controls and their visual layout and styling. Can see all others components. Defines and handles UI visual behavior, such as animations or transitions. Code behind may contain code that requires direct references to the specific UI controls.
- 14. Classes Interaction Interaction Ways Data Binding Commands Notifications
- 15. What about MVP & MVC ?
- 16. MVP vs. MVC vs. MVVM
- 17. MVP vs. MVC vs. MVVM MVP (Presenter) MVC (Controller) MVVM (View Model) view communicates with the view sends input events to View binds directly to the presenter by directly calling the controller via a callback View Model. functions on an instance of or registered handler the presenter. The presenter communicates with the view by talking to an interface implemented by the view View receives updates directly from the model without having to go through the controller changes in view are automatically reflected in View Model and changes and Vice versa. Use where binding via a data context is not possible Use where the connection between view and the rest of the program is not always available Use where binding via a data context is possible
- 18. Why ? And Why not?
- 19. MVVM Advantages Separation of concerns. Can use unit tests. Designers and developers can work synchronously. Easy to redesign the UI . Can share code easily.
- 20. MVVM Disadvantages Harder to debug. May affect performance. More files to serve the architecture.
- 21. MVVM in Android MVVMCross for Xamarin.Android. Dot42 Framework. (C# for android). Android-binding. Robo Binding
- 22. Conclusion & Recommendations MVVM is a suitable architectural pattern for business apps. Use MVVM only when you need it. Using MVVM is highly recommended in Cross- Platform development. MVVM is a tool not a purpose.
- 23. References http://www.codeproject.com/Articles/100175/Model-View-ViewModel-MVVM-Explained http://blogs.adobe.com/paulw/archives/2007/10/presentation_pa_3.html http://en.wikipedia.org/wiki/Model_View_ViewModel http://aspnet.blogershub.com/Archive/2013/12/what-is-difference-Application-Architecture-and- Design-Patterns http://msdn.microsoft.com/en-us/library/hh848246.aspx http://msdn.microsoft.com/en-us/library/ms752347(v=vs.110).aspx http://msdn.microsoft.com/en-us/library/windows/apps/xaml/hh758320.aspx http://msdn.microsoft.com/en-us/library/gg405484(v=pandp.40).aspx http://joel.inpointform.net/software-development/mvvm-vs-mvp-vs-mvc-the-differences-explained/
- 24. Design Patterns VS. Architectural Patterns Design Patterns Guidelines to avoid/solve common problems in application development. Tell us how we can achieve a solution in terms of implementation. Implementation Level. Architectural Patterns Guidelines to construct the structure and behavior of applications. Tell us how to arrange the interaction between application packages, databases, and middleware systems . Abstract Level.
- 25. Presentation Model Pattern Introduce by Martin Fowler in 2004. An abstract of the view that is not dependent on a specific GUI framework. State is in the presentation model. Logic is in the presentation model. View observes the model and updates accordingly. The view “knows” about the presentation model. The presentation model does not “know” about the view. presentation model Also Known as application model, view state or logical View.
- 26. Data Binding (State) Process that establishes a connection between the application UI and application logic. When the data changes its value, the elements that are bound to the data reflect changes automatically.
- 27. Data Binding (State) Direction of the data flow: One Time bindings update the target with the source data when the binding is created. One Way bindings update the target with the source data when the binding is created, and any time the data changes. This is the default mode. Two Way bindings update both the target and the source when either changes.
- 28. Commands (Behavior) Provide a way to represent actions or operations that can be easily bound to controls in the UI. Encapsulate the actual code that implements the action or operation . Examples : Button Click , List selection changed.
- 29. Notifications Implementing INotifyPropertyChanged and INotifyCollectionChanged interface. OnPropertyChanged method is required to notify binding target properties with change in source. Observable Collection needed for binding lists source.