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. 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 The essence of a Presentation Model is of a fully self-contained class that represents all the data and behavior of the UI window, but without any of the controls used to render that UI on the screen. When to use it Figure 3: The album window.
visionmedia/jadePassive ViewA screen and components with all application specific behavior extracted into a controller so that the widgets have their state controlled entirely by controller. A perennial problem with building rich client systems is the complication of testing them. Most rich client frameworks were not built with automated testing in mind. Controlling these frameworks programaticly is often very difficult. A Passive View handles this by reducing the behavior of the UI components to the absolute minimum by using a controller that not just handles responses to user events, but also does all the updating of the view. How it Works This pattern is yet another variation on model-view-controller and model-view-presenter. Figure 1: Unlike most MVC-style configurations, Passive View results in no dependencies between view and model. Figure 2: When the actual text is edited, all the UI response is handled by the controller. Figure 3: Classes for the assessment example. When to use it Significant Revisions
Design Patterns Quick ReferenceSo 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!
Alpha list of refactoringsYou have constructors on subclasses with mostly identical bodies. Create a superclass constructor; call this from the subclass methods. more… Two subclasses have the same field. Move the field to the superclass. more… You have methods with identical results on subclasses. Move them to the superclass. more… A field is used only by some subclasses. Move the field to those subclasses. more… Behavior on a superclass is relevant only for some of its subclasses. Move it to those subclasses. more… You have conditional code that is unnecessarily verbose and does not use the most readable Ruby construct. Replace the conditional code with the more idiomatic Ruby construct. more… Remove Assignments to Parameters The code assigns to a parameter. Use a temporary variable instead. more… You have a variable that is acting as a control flag for a series of boolean expressions. Use a break or return instead. more… A class is doing too much simple delegation. Get the client to call the delegate directly. more… more… Remove it. more…
MVP In Silverlight/WPF SeriesNederlandstalig? U woont in Vlaanderen? Bezoek Vlakbij.me en kom in contact met de beste handelaars in je buurt I recently criticized the MVVM pattern which pretty much every Silverlight and WPF developer has probably used by now. And that's why I decided to write this series instead of simply trying to back up my statements with a post that showed some code. These are the posts the series consists of:Welcome to Core J2EE Patterns!Oracle Technology Network > Java Software Downloads View All Downloads Top Downloads New Downloads What's New Java in the Cloud: Rapidly develop and deploy Java business applications in the cloud. Essential Links Developer Spotlight Java EE—the Most Lightweight Enterprise Framework? Blogs Technologies Contact Us About Oracle Cloud Events Top Actions News Key Topics Oracle Integrated Cloud Applications & Platform Services
Design Patterns | Object Oriented DesignUsing Model View Presenter in WPF - Paul StovellI have owned a copy of Sams Teach Yourself WPF in 24 Hours for about a year, and I still find it an interesting book. One thing I like about this book is that doesn't just show off WPF features - it shows how to use the Model-View-Presenter pattern in doing so. The book was written by Rob Eisenberg and Christopher Bennage from BlueSpire, who are also the guys behind the Caliburn WPF framework, so they know a thing or two about the Model-View-Presenter pattern. Like the Model-View-ViewModel pattern, we can mostly agree upon what the MVP pattern is, but in practice nearly every implementation looks different. As in the Teach Yourself WPF in 24 Hours book, my sample application is a contact manager. The application has a shell, and a docking panel like Visual Studio. You can download the code to follow along. First let's highlight some differences in terms of approaches to the MVP pattern between the two. View->Presenter Communication Some considerations to keep in mind here are: Is it MVVM?