That sounds easy enough, and you are probably thinking, oh, I could use a Mediator for that, but remember the Mediator is a broadcaster that broadcasts a message NotifyColleagues("New Customer Edit", SomeCustomer), so any subscriber of this message would have to work out whether they should add a new View for the CustomerEditView. And this is exactly what MefedMVVM does, so basically, when you add a reference to the MefedMVVM DLL, you are allowing MefedMVVM to include the Assembly that references MefedMVVM as part of the overall CompositionContainer that contains the Exports. In Cinch V2, there is no support at all for this, as this comes out of the box with WPF 4/.NET 4.0. Occurs when changes occur that affect whether the command should execute. That is done by a special catalog called MEFedMVVMCatalog. This is a simple class that inherits from GoToStateAction and is expecting to be used in conjunction with a Cinch V2 CompletedAwareGoToStateCommandTrigger, which has a CommandCompleted event (which we talked about above), which you can use to supply a StateName with, using the CommandParameter in your ViewModel. Here is the relevant code from the MefedMVVM bootstrapper: Can you see that there is a DefaultDesignTimeComposer? Probably one of the best places to start with MEF is the MEF CodePlex site, which is available using any of the MEF links within this article. BindingEvaluator be = new BindingEvaluator(); Object x = be.GetBoundValue(positionBinding); Dummy internal DP, to bind and get value from, Use this evaluator when you know the return type expected. In this case GoToStateActions are used in the View, Fire the command from the ViewModel, so the Views, trigger can carry out any Actions associated. So let us just have a look at what sort of design time support Cinch V2/MeffedMVVM offers the DataTemplates workspace approach that a Cinch V1'ish type app uses. It is literally a piece of piss to use MefedMVVM with Cinch V2, a single reference, a few attributes, and an Attached DP in the View's XAML, and it just works. Majority of these methods are different ways for specifying a set of exports to retrieve, a format to return them, and whether or not it is a single item or a collection that is returned. One of the most important things you need to consider when wanting to use design time data and MefedMVVM (and therefore Cinch V2) is the View first approach which allows designers to be able to actually see what the finished article will look like. I would very, very strongly recommend that you use a DataTemplate like that shown above. http://stackoverflow.com/questions/1889966/what-approaches-are-available-to-dummy-design-time-data-in-wpf, http://karlshifflett.wordpress.com/2008/10/11/viewing-design-time-data-in-visual-studio-2008-cider-designer-in-wpf-and-silverlight-projects/. The GetExportedObject / GetExportedObjects method returns the actual instances that the Exports create. Child classes can override this method to perform. Well, some of you may also know that I absolutely love WPF and that some time ago I wrote a pretty well received ModelView-ViewModel (MVVM) framework called Cinch, which I presented here at CodeProject a while back. Polecamy Oyaide Tunami Terzo RR, Oyaide Interkonekt audio PA-02TR V2 … And this is how we might use this in some XAML: This example uses a standard Blend GoToStateAction but this could be any Action that you like that you want to trigger based on a SimpleCommand in the ViewModel Completing: And this is what some ViewModel code might look like: I don't know how many of you know this, but the standard VisualStateManager that can be used to programmatically go to a particular VisualState will only work when the VisualStateGroup that contains the VisualState you are trying to go to is contained directly under the root element in your VisualTree. In practical terms, all you need to do is use the meffed:ViewModelLocator.ViewModel attached DP in your View, and mark up your ViewModel with the MefedMVVM ExportViewModelAttribute, and decide what instancing you need for the Exported ViewModel (Singleton (Shared), or new instance (NonShared)) job done. Sep 13, 2012 - Brett Lund from Roberts Arts & Crafts discusses the differences between the original Cinch from We R Memory Keepers, and the new Cinch v2. That's cool, we now have an Export (ViewModel) that matches our original string where we specified what ViewModel we wanted. So then what happened is, I kept destroying my brain by reading and re-reading Marlon's implementation, and in the end, I just felt that Marlon's implementation was closer to what I was trying to do, and then I got another email from Marlon stating he was giving a talk on his library, which I attended. As I just stated, MefedMVVM does this using the Instance.Resolver.GetViewModelByContract(), so let's have a look at that. So how do we now use these new improved SimpleCommand? These services may be data services (provide data either at design time or runtime), or may be core framework services such as MessageBox/OpenFile/SaveFile services. But a small price to pay, I think. Kontakt AveBmx - Bmx'owy sklep internetowy i STACJONARNY ul. of processing to finish before we shift focus. Well, quite a bit actually: So what does the new SimpleCommand look like: Some of the more eagle eyed amongst you may have noticed a CommandCompleted WeakActionEvent, which we will discuss in the next section. If stealing gems from your articles was a crime, I'd be a lifer! As promised, within each article, I shall be showing the Cinch V2 compatibility matrix. This should only be done once per app, as the Template to use will always be the same (or it should be). Until now, any application that wanted to support a plug-in model needed to create its own infrastructure from scratch. See more ideas about book binding, mini albums, cinch. You are binding to your ViewModel the same way at design time, as you are at runtime; it is the same ViewModel that will have either design time or runtime services injected depending on whether you are at design time or runtime. In the case of MefedMVVM, that link is done through the use of the MEFedMVVMExportProvider which gets passed the MEFedMVVMCatalog which we discussed in the last subsection. item 3 Cinch Book Binding Tool V2 11.5"X8"X5" 633356710509 - Cinch Book Binding Tool V2 11.5"X8"X5" 633356710509. Karl Shifflett has a nice post on this: http://karlshifflett.wordpress.com/2009/10/28/ddesigninstance-ddesigndata-in-visual-studio-2010-beta2/. These work the same way as I discussed in the Cinch V1 article CinchIII.aspx#WPFMenuItems but Cinch V1 was solely aimed at WPF, and with Cinch V2, we now have Silverlight support, so it did not seem that right to keep the MVVM menus called WPFMenuItem, so all that has changed is that the name of the class has been changed to something more suitable for a cross technology framework, and the new name is CinchMenuItem. The ViewModel first and DataTemplates method is still supported by Cinch V2, and MeffedMVVM can still be used to supply design time data, though the way you have to create the ExportViewModelAttribute on the ViewModel would need to be told that the ViewModel is expecting to be set directly as the DataContext for a View (say via a DataTemplate), which would be the case in a ViewModel first approach using DataTemplates as done in a Cinch V1'ish style app. You can punch perfectly round . home, school and office projects! Well, as before, there is a special attribute called ExportServiceAttribute which can be used to mark up your services. Here is what the actual DP code looks like: It can be seen that it uses the value of the property to use as a ViewModel contract name, and it then makes a call to the ViewModelRepository.AttachViewModelToView method passing in both the ViewModel contract name and the actual view element. Well, that is done using two things: Let's examine the inner workings of these two items, shall we? So how do they work? Well, starting with the ViewModelBase class, there is this code: And then we have something like this in the TextBoxFocusBehavior: You can see that this Blend Behaviour supports DataWrappers too, you just need to specify if the TextBox you are applying this Behaviour to is bound to a DataWrapper. Now I don't think many people know this, but there is also a ExtendedVisualStateManager that can work with any FrameworkElement; as such, Cinch V2 provides a Blend trigger that can work with a Cinch SimpleCommand CommandCompleted event to make use of the ExtendedVisualStateManager or the standard VisualStateManager. This interface defines a interface that will allow, This method should show a window that allows a file to be selected. In this case, CreationPolicy.Shared is used, so there will only be one instance that is shared to all importers. Basically, it boils down to this: a View in injected into the MEFedMVVMExportProvider just before a ViewModel export is created. This is a rewrite of the SimpleCommand that was available in Cinch V1. So let's just go through a quick scenario: "Suppose you have a TabControl that is showing a list of customers, and that list of customers is its own View (say CustomersListView/CustomerListViewModel), and when you click on one of the customers in the list, you wish to open a new View which shows the selected customer's details in a new View (say CustomerEditView / CustomerEditViewModel).". So what are the things that have changed? In most cases, I am pretty confident that these issues will be easily resolvable. Note: In Cinch V1, there was also support for input gestures firing commands; with WPF 4, this is less than trivial, and can be achieved using the following sort of code: This section discusses Workspace support in Cinch V1 (OK, there was no MeffedMVVM support in V1, I mean a V1'ish approach in V2 really) and Cinch V2 proper. (The original requires an adjustment bar for smaller wires) Easy to turn knob at top of Cinch bar for selecting wire diameter Cinch V1 had two Attached DPs that could be used to fire ViewModel ICommands when various View lifecycle events (such as Loaded/Unloaded) occurred. We R Memory Keepers The Cinch makes booking binding quick, . Cinch V1 introduced a simple delegate style ICommand implementation, which was fine at the time, but with Cinch V2, SimpleCommand has received some serious loving, and now expects two generic arguments. This book binding tool allows you to punch properly and evenly spaced holes, with no measuring required. Cinch V2 is a pretty big framework that tries to deal with a lot of different things; as such, there are a lot of classes, and I think it may all get a bit confusing for you (even with documentation such as this) without a compatibility matrix. Now that I have shown you what classes will work with WPF/Silverlight, let's get on with the rest of this article, shall we? Anyway, that is all for now. Whilst MefedMVVM was being developed, Marlon, Glenn Block (Microsoft MEF Program Manager) and I were having some quite lengthy discussions about how to handle ViewModels that needed to link to the View. We can see this code has a direct impact on what is added to the CompositionContainer, such that when the CompositionContainer is queried, we know we are either getting design time Exports or runtime Exports or both. ", if user did not want to cancel, keep workspace open, otherwise close workspace, and make sure to unhook WorkspaceTabClosing event, CinchV2:NavProps.ShouldHideHostWhenNoItems, This DP is used to create the actual workspace View based on the value of the. So a 5 from me. This is something that Cinch V2 does offer over the standard Blend Actions/Trigger combination. If you missed some of the utilities in Cinch V1, here is brief description of what they did: I decided to include one more within Cinch V2, which I borrowed from fellow WPF Disciple and good friend Daniel Vaughan. MEF provides a standard way for the host application to expose itself and consume external extensions. Note: One thing to note is that you must also decide what instancing you would like to use for the ViewModel when it gets MEFed. I currently hold the following qualifications (amongst others, I also studied Music Technology and Electronics, for my sins), modified on Thursday, May 5, 2011 8:25 AM, Interface that is used for ICommands that notify when they are, Simple delegating command, based largely on DelegateCommand from PRISM/CAL, now raise CommandCompleted for this ICommand. It is the best binding tool on the market for . Handles changes to the ViewCreator property. I like the functionality this MVVM framework provides, but MEF is not really something we need and is pretty much overkill. $101.47. Well, they are as follows: This may seem a lot, but I am sure once you see what you can do with the new framework, you will realise why I had to make these changes. In this article, we will examine what is brand new to Cinch V2, and where appropriate, I will show you if it is replacing some Cinch V1 functionality. The only bad thing with this is that your ViewModel now contains code that is only used at design time. Great toolkit used in commercial product. The compatibility matrix shows a list of classes along with their general work area, and whether they are compatible with WPF or SL or both. To be honest, I am so much happier with the new framework than the old one, that I do not mind these breakages. Bind booklets up to ¾" thick books, using double O wires . Now that is a bit messed up, don't you think? You know even if you do not end up liking or using Cinch V2, you should really take the time out to get to know MefedMVVM as it is simply awesome. OK so that is what the article roadmap looks like, so I guess it is now time to dive into the guts of this article, so lets go: Now we can get into the guts of this article which is really the new stuff that has been added to Cinch V2; some of it is a rewrite of Cinch V1 stuff that has been rewritten to current best practices, such as using Blend interactivity. When working with WPF, you will be working with the VisualTree, so it is useful to have some helper to aid in the drudgery. some reverse commands, that the VM fires, and the View uses as CompletedAwareCommandTriggers, to carry out some actions. MefedMVVM deals with all of this for us. What on, I hear you ask. ValidatesOnDataErrors=True, ValidatesOnExceptions=True}", CinchV2:SelectorDoubleClickCommandBehavior, Where you setup your Command in your ViewModel, get orginal sender (ListView in this case), As this is a TextBox we use TextBox.TextProperty. The new workspace management also allows some contextual data to be sent to the view. The area of particular interest here is the SetContextToInject(object context) method and the GetExportsCore(ImportDefinition definition, AtomicComposition atomicComposition) and GetValue(Export innerExport) methods. Anyway, that should give you a bit of an insight as to how MefedMVVM goes about its business. Now all of this is grand, but unfortunately, WPF throws some weirdness in our path, in the form of the TabControl. Here is the relevant code from the MeffedMVVM codebase: As I say, this is how a Cinch V1'ish app / ViewModel first can happily work with MeffedMVVM, and you can read more about the DataTemplates approach using the Cinch V1 article link: CinchIII.aspx#CloseVM. Creates a new collection and assign it the properties for view. As the container is an ExportProvider, this means definitions may be passed in directly through its methods. However, it would take very careful measuring and placement to get the holes aligned properly. Well, the simple answer is that better things come along, and I like to move with the times, and it is my framework, so I feel if I want to change it, I am allowed to, so I did. Well, what happens is Blend has an AppDomain that knows about all the Assemblies in the current solution file. Let's have a look at that: So you can see that different things are loaded dependant on whether you are in design time or runtime.
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