Make custom tabs deletable in the demo (#3242)

* Make custom tabs deletable in the demo

* Add missing file

* Moving code around to fix nullability warnings

---------
Co-authored-by: NKevin Bost <kitokeboo@gmail.com>

MainDemo.Wpf/Domain/TabsViewModel.cs

 using System.Collections.ObjectModel;
+using CommunityToolkit.Mvvm.ComponentModel;
 
 namespace MaterialDesignDemo.Domain;
 
@@ -19,30 +20,46 @@ internal class TabsViewModel : ViewModelBase
 
 Nulla a porta libero, quis hendrerit ex. In ut pharetra sem. Nunc gravida ante rhoncus commodo aliquet. Integer luctus blandit libero, sed faucibus ligula ornare ut. Mauris facilisis, urna eu fermentum mollis, mauris massa commodo odio, a venenatis nunc nunc sollicitudin nibh. Ut mattis ipsum nec lacus mattis fringilla. Proin vulputate id velit a finibus. Ut nunc ex, elementum porttitor finibus vel, pellentesque vel turpis. Cras fringilla eleifend libero, ac feugiat arcu vehicula ornare. Nullam pretium finibus blandit. Etiam at urna facilisis, posuere felis non, congue velit. Pellentesque tortor erat, mattis at augue eu, egestas interdum nunc. Aliquam tortor lorem, venenatis eget vestibulum vitae, maximus eget nunc. Vestibulum et leo venenatis, rutrum lacus eget, mattis quam.";
 
-    public TabsViewModel() =>
+    public TabsViewModel()
+    {
+        var closeCommand = new AnotherCommandImplementation(_ =>
+        {
+            if (SelectedTab is { } selectedTab)
+                CustomTabs?.Remove(selectedTab);
+        });
+
         CustomTabs = new()
         {
-            new CustomTab {CustomHeader = "Custom tab 1"},
-            new CustomTab {CustomHeader = "Custom tab 2"}
+            new CustomTab(closeCommand)
+            {
+                CustomHeader = "Custom tab 1",
+                CustomContent = "Custom content 1"
+            },
+            new CustomTab(closeCommand)
+            {
+                CustomHeader = "Custom tab 2",
+                CustomContent = "Custom content 2"
+            },
+            new CustomTab(closeCommand)
+            {
+                CustomHeader = "Custom tab 3",
+                CustomContent = "Custom content 3",
+            },
         };
+    }
+
 }
 
-internal class CustomTab: ViewModelBase
+internal partial class CustomTab : ObservableObject
 {
     public ICommand CloseCommand { get; }
 
-    public string? CustomHeader { get; set; }
+    public CustomTab(ICommand closeCommand) => CloseCommand = closeCommand;
 
-    public string? CustomContent => CustomHeader + ", close clicked: " + CloseClickCount;
+    [ObservableProperty]
+    private string? _customHeader;
 
-    public int CloseClickCount { get; private set; }
+    [ObservableProperty]
+    private string? _customContent;
 
-    internal CustomTab()
-    {
-        CloseCommand = new AnotherCommandImplementation(_ =>
-            {
-                CloseClickCount++;
-                OnPropertyChanged(nameof(CustomContent));
-            });
-    }
-}
\ No newline at end of file
+}

MainDemo.Wpf/MaterialDesignDemo.csproj

@@ -41,6 +41,7 @@
     <PackageReference Include="BluwolfIcons">
       <NoWarn>NU1701</NoWarn>
     </PackageReference>
+    <PackageReference Include="CommunityToolkit.Mvvm" />
     <PackageReference Include="VirtualizingWrapPanel" />
     <PackageReference Include="ShowMeTheXAML" />
     <PackageReference Include="ShowMeTheXAML.AvalonEdit" />