CODEWITHSUNDEEP
c#wpfmvvmprism
Ehsan Zargar Ershadi
Ehsan Zargar Ershadi

Reputation: 24833

How to get the current active view in a region using PRISM?

I know that i can get all the registered views in a region with :

var vs = mRegionManager.Regions[RegionNames.MainRegionStatic].Views.ToList();

and i can see there is the following code :

mRegionManager.Regions[RegionNames.MainRegionStatic].ActiveViews

which is giving a list of Active View, but I'm having my region attached to a ContentControl which always has a single ActiveView. Am i misunderstood or is there a way to get the single active view?

Upvotes: 18

Views: 10934

Answers (4)

djunod
djunod

Reputation: 4976

Using Xamarin.Forms & Prism, this works well for me. Change the regionName, change the View Model base to yours.

public VisualElement GetCurrentRegionView()
{
    var regionName = "MenuPageRegion";
    var region = RegionManager.Regions[regionName];
    var uri = region.NavigationService.Journal.CurrentEntry.Uri.OriginalString;
    foreach (var view in region.ActiveViews)
    {
        var name = view.GetType().FullName;
        if (name.EndsWith(uri))
            return view;
    }
    return null;
}

public CommonViewModelBase GetCurrentRegionViewModel()
{
    var view = GetCurrentRegionView();
    if (view != null)
    {
        var binding = view.BindingContext;
        if (binding is CommonViewModelBase model)
            return model;
    }
    return null;
}

Upvotes: 0

Prince Owen
Prince Owen

Reputation: 1505

Well, you could use the NavigationService Journal. It takes record of all the navigation that takes place in your application. So, you can get the name of the view like this:

string name = mRegionManager.Regions[RegionNames.MainRegionStatic].NavigationService.Journal.CurrentEntry.Uri;

Then you can get the view like this:

mRegionManager.Regions[RegionNames.MainRegionStatic].GetView(name);

Sweet Right? :)

Upvotes: 2

Ahmed
Ahmed

Reputation: 51

var singleView = regionManager.Regions["MyRegion"].ActiveViews.FirstOrDefault();

This is not correct, as it will just bring whatever view that got activated first. not the currently active/visible view.

Can't find a direct solution though, that doesn't involve custom implementation on View or ViewModel.

Upvotes: 5

Navid Rahmani
Navid Rahmani

Reputation: 7958

var singleView = regionManager.Regions["MyRegion"].ActiveViews.FirstOrDefault();

Upvotes: 15

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