Model View ViewModel

MVVM facilitates a clear separation of the development of the graphical user interface (either as markup language or GUI code) from the development of the business logic or back end logic known as the model (also known as the data model to distinguish it from the view model). The view model of MVVM is a value converter[4] meaning that the view model is responsible for exposing the data objects from the model in such a way that those objects are easily managed and consumed. In this respect, the view model is more model than view, and handles most if not all of the view’s display logic (though the demarcation between what functions are handled by which layer is a subject of ongoing discussion[5] and exploration). History[edit] Microsoft MVP Josh Smith reported[6] that "In 2005, John Gossman, currently one of the WPF and Silverlight Architects at Microsoft, unveiled the Model-View-ViewModel (MVVM) pattern on his blog. A notable Javascript implementation of this pattern is Knockout.js.

Presentation Model Represent the state and behavior of the presentation independently of the GUI controls used in the interface Also Known As: Application Model GUIs consist of widgets that contain the state of the GUI screen. Leaving the state of the GUI in widgets makes it harder to get at this state, since that involves manipulating widget APIs, and also encourages putting presentation behavior in the view class. Presentation Model pulls the state and behavior of the view out into a model class that is part of the presentation. The Presentation Model coordinates with the domain layer and provides an interface to the view that minimizes decision making in the view. Presentation Model may interact with several domain objects, but Presentation Model is not a GUI friendly facade to a specific domain object. Presentation Model is known to users of Visual Works Smalltalk as Application Model How it Works To do this the Presentation Model will have data fields for all the dynamic information of the view.

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Design Patterns Quick Reference So every time I am designing something new I find myself either searching Google or opening up a gang of four (GoF) book to aid me. I searched for a bit trying to find a handy-dandy flash card showing class diagrams and purposes for the basic GoF patterns but was unable to locate a good one (for free). So I made my own.If you see any mistakes or improvements please post here and I will update the docs. If you find this useful, please consider making a donation, even if it is just a few dollars. The ad revenue for this site doesn’t quite cover rent… There are multiple formats you can download in: PDF Cards: Get it! Poster: Get it! Page 1: Page 2: Enjoy!

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