Model–view–viewmodel
Software architecture design pattern / From Wikipedia, the free encyclopedia
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Model–view–viewmodel (MVVM) is an architectural pattern in computer software that facilitates the separation of the development of a graphical user interface (GUI; the view)—be it via a markup language or GUI code—from the development of the business logic or back-end logic (the model) such that the view is not dependent upon any specific model platform.
The viewmodel of MVVM is a value converter,[1] meaning it is responsible for exposing (converting) the data objects from the model in such a way they can be easily managed and presented. In this respect, the viewmodel is more model than view, and handles most (if not all) of the view's display logic.[1] The viewmodel may implement a mediator pattern, organizing access to the back-end logic around the set of use cases supported by the view.
MVVM is a variation of Martin Fowler's Presentation Model design pattern.[2][3] It was invented by Microsoft architects Ken Cooper and Ted Peters specifically to simplify event-driven programming of user interfaces. The pattern was incorporated into the Windows Presentation Foundation (WPF) (Microsoft's .NET graphics system) and Silverlight, WPF's Internet application derivative.[3] John Gossman, a Microsoft WPF and Silverlight architect, announced MVVM on his blog in 2005.[3][4]
Model–view–viewmodel is also referred to as model–view–binder, especially in implementations not involving the .NET platform. ZK, a web application framework written in Java, and the JavaScript library KnockoutJS use model–view–binder.[3][5][6]