In this post, we'll demonstrate how to use Prism Regions to create a dynamic TabControl in WPF, where each tab is loaded with a separate view.
Step 1: Create a new Prism WPF project
To get started, create a new Prism WPF project using the Prism Template Pack.
Open Visual Studio and select "Create a new project".
In the "New Project" dialog, select "Prism WPF App" under the "Prism" category.
Step 2: Add a TabControl to your main view
In the main view of your application, add a TabControl to the XAML markup. Set its ItemsSource property to a collection of objects that represent each tab item. In this example, we'll use an ObservableCollection<TabItem> property defined in the view model.
<TabControl ItemsSource="{Binding TabItems}">
<TabControl.ItemTemplate>
<DataTemplate>
<TextBlock Text="{Binding Header}" />
</DataTemplate>
</TabControl.ItemTemplate>
<TabControl.ContentTemplate>
<DataTemplate>
<ContentControl prism:RegionManager.RegionName="{Binding RegionName}" />
</DataTemplate>
</TabControl.ContentTemplate>
</TabControl>
Notice that we're using a ContentControl to load the content of each tab. This is because we want to use Prism Regions to dynamically load and unload views in each tab.
We're also using a DataTemplate for the tab headers, which binds to the Header property of the TabItem object.
Step 3: Define the TabItem objects in your view model
In your view model, define a collection of TabItem objects that correspond to each tab. Each TabItem should have a unique RegionName property that corresponds to the name of the Prism Region that will be loaded in the tab.
public class MainViewModel
{
public ObservableCollection<TabItem> TabItems { get; set; }
public MainViewModel()
{
TabItems = new ObservableCollection<TabItem>();
TabItems.Add(new TabItem { Header = "Tab 1", RegionName = "Tab1Region" });
TabItems.Add(new TabItem { Header = "Tab 2", RegionName = "Tab2Region" });
}
}
public class TabItem
{
public string Header { get; set; }
public string RegionName { get; set; }
}
We'll bind the TabControl's ItemsSource property to this collection in the XAML markup.
Step 4: Register the regions in your Prism Bootstrapper
In your Prism Bootstrapper, register the regions that will be loaded in the tabs. We'll use a ContentControlRegionAdapter class to adapt the ContentControl to a Prism Region.
protected override void ConfigureRegionAdapterMappings(RegionAdapterMappings mappings)
{
base.ConfigureRegionAdapterMappings(mappings);
mappings.RegisterMapping(typeof(ContentControl), Container.Resolve<ContentControlRegionAdapter>());
}
The ConfigureRegionAdapterMappings method is called when the Prism application is initialized. Here, we're registering a new mapping for the ContentControl type, using an instance of our custom ContentControlRegionAdapter.
Step 5: Create a custom RegionAdapter for the ContentControl
Finally, we need to create our custom ContentControlRegionAdapter class.
public class ContentControlRegionAdapter : RegionAdapterBase<ContentControl>
{
public ContentControlRegionAdapter(IRegionBehaviorFactory regionBehaviorFactory) : base(regionBehaviorFactory)
{
}
protected override void Adapt(IRegion region, ContentControl regionTarget)
{
region.Views.CollectionChanged += (s, e) =>
{
if (e.Action == NotifyCollectionChangedAction.Add)
{
foreach (object view in e.NewItems)
{
regionTarget.Content = view;
}
}
};
}
protected override IRegion CreateRegion()
{
return new SingleActiveRegion();
}
}
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