Presentation Model
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The document summarizes the presentation model pattern and Model-View-ViewModel (MVVM) design pattern. It discusses how MVVM is an implementation of the presentation model pattern for WPF and Silverlight applications. It outlines key aspects of MVVM like separating the view and view model, using XAML for views, data binding between views and view models, commands, validation, messaging between components, and view model locators. The document provides examples of how to implement features like data binding, commands, and validation using MVVM.
Presentation Model
- 1. Presentation Model The First Contact
- 2. Agenda Quick Introduction Why should I care about it? View Model XAML Data Binding ViewModel Base Commands Validation Data Templates Resource Systems MVVM Framework How do I do…?
- 3. Quick Introduction: Presentation Patterns
- 4. UI Patterns Comparison Passive View Supervising Controller Presentation Model
- 5. Presentation Model “Probably the most annoying part of the Presentation Model is the synchronization between Presentation Model and view. It’s simple code to write, but I always like to minimize this kind of boring repetitive code. Ideally some kind of framework could handle this, which I’m hopping will happen some day with technologies like .NET’s data binding.” Martin Fowler, 2004.
- 6. Model – View – ViewModel Technology specific implementation of the PM Separation of Markup and Code Behaviour of the Application Look and Feel Tool Support
- 7. “Once a developer becomes comfortable with WPF and MVVM, it can be difficult to differentiate the two. ”. Josh Smith, MVVM Guru
- 8. Why should I care about it? Order vs. Chaos Technology Choice Loose Coupling Testability (DEMO) Maintainable Code Blendability (DEMO) It is cool
- 9. <Disclaimer> No Solution is Perfect Different Approaches View-Centric ViewModel Centric </Disclaimer>
- 10. View Model Separation of Concerns Enables code reuse State + Operations Provides a Bindable Surface Not Dependent on the View Typically One-To-One ViewModel to View One-To-Many is very common though
- 11. XAML Humble View Plays nicely with Data Binding capabilities
- 12. Data Binding Binding Expression Binding Direction Binding to Elements Binding to Templates RelativeSource
- 13. DEM O
- 14. Commands Delegate Command vs. Relay Command (DEMO) Uses WPF Behaviours capabilities Map Events to Commands (DEMO)
- 15. DEM O
- 16. Validation Implemented on ViewModel, not in Model Class
- 17. DEM O
- 18. Messaging Uses a light message bus to communicate between components Publish/Subscribe Frameworks (MVVM Light) (DEMO)
- 20. ViewModel Locator Repository of ViewModels Uses WPF DataTemplate Capabilities One View per ViewModel MVVM Light
- 22. Trade-Offs Agregate Model vs Proxy Property Start animation on the View through ViewModel How to close a window Clean and Shutdown Handle Navigation Add your own topic to be discussed…
- 23. And continues… Not used only with WPF/Silverlight: ASP.NET MVC Knockout.js Java frameworks (RLY?) To Far and Beyond… That’s it ;-)
Editor's Notes
- #4: MVC: