my understanding of various GUI patterns MVC, MVP, MVVM etc.

1. GUI Patterns
: my understanding
Nitin Bhide
http://thinkingcraftsman.in

2. Model - View
 Separation between
◦ data and
◦ its display representation.
 Also known as ‘Document/View’
 Used in MFC

3. Model –View
Model/
Document
ViewImpl1
ViewImpl2
IView

4. Model -View–Controller (MVC)
 Separation among
◦ data and
◦ its display representation and
◦ manipulation of data

5. MVC - Structure

6. MVC - Implementation
 Model
◦ Model either doesn’t know about View or knows
view through interface.
◦ Models doesn't know about controller.
 View
◦ View knows the concrete instance of model.
◦ View doesn't know about controller. Or may know
it through interface
 Controller
◦ Controller knows both Views and Model.

7. MVC - Consequences
 Clear separation. Worked well in
Desktop applications as well as Web
applications.
 Difficult to write automated tests for
Controllers

8. Model-View-Presenter
 Separation among
◦ data and
◦ its display representation and
◦ manipulation of data
 Somewhat similar to MVC

9. MVP - Structure

10. Model-View-ViewModel
 Separation among
◦ data and
◦ Maintaining transient state and manipulation of
model data. Allow data binding
◦ its display representation and
 In GoF terms, ViewModel is an adapter
between View and Model
 Used in WPF

11. MVVM - Structure

12. MVVM - Implementation
 Model
◦ Doesnot know about View
◦ Doesnot know about ViewModel or may know
about ViewModel through interface
 ViewModel
◦ Knows about Model
◦ Doesnot know about View or knows about view
through interface
 View
◦ Knows about ViewModel
◦ Doesn’t know about Model

13. MVVM - Structure

14. THANKS

15. Contact
Visit the website
http://thinkingcraftsman.in
Feel free to email me at
nitinbhide@thinkingcraftsman.in
Join the discussions on
‘nitinsknowledgeshare’ Google Group

16. References
 Presentation Model Pattern by Martin
Fowlers
http://martinfowler.com/eaaDev/Presenta
tionModel.html
 Prism: Patterns For Building Composite
Applications With WPF by Glenn Block
http://msdn.microsoft.com/hi-
in/magazine/cc785479%28en-us%29.aspx