Introduce ConfigureFonts AppBuilder action

Introduce WithInterFont extension method

samples/ControlCatalog.NetCore/Program.cs

@@ -125,7 +125,7 @@ namespace ControlCatalog.NetCore
                     EnableIme = true
                 })
                 .UseSkia()
-                .WithFonts(new InterFontCollection())
+                .WithInterFont()
                 .AfterSetup(builder =>
                 {
                     builder.Instance!.AttachDevTools(new Avalonia.Diagnostics.DevToolsOptions()

src/Avalonia.Controls/AppBuilder.cs

@@ -208,23 +208,15 @@ namespace Avalonia
         }
         
         /// <summary>
-        /// Registers a custom font collection with the font manager.
+        /// Registers an action that is executed with the current font manager.
         /// </summary>
-        /// <param name="fontCollection">The font collection.</param>
+        /// <param name="action">The action.</param>
         /// <returns>An <see cref="AppBuilder"/> instance.</returns>
-        /// <exception cref="ArgumentNullException"></exception>
-        public AppBuilder WithFonts(IFontCollection fontCollection)
+        public AppBuilder ConfigureFonts(Action<FontManager> action)
         {
-            if(fontCollection == null)
-            {
-                throw new ArgumentNullException(nameof(fontCollection), "Font collection can't be null.");
-            }
-
             return AfterSetup(appBuilder =>
             {
-                var fontManager = FontManager.Current;
-
-                fontManager.AddFontCollection(fontCollection);
+                action?.Invoke(FontManager.Current);
             });
         }
 

src/Avalonia.Fonts.Inter/AppBuilderExtension.cs

@@ -0,0 +1,13 @@
+namespace Avalonia.Fonts.Inter
+{
+    public static class AppBuilderExtension
+    {
+        public static AppBuilder WithInterFont(this AppBuilder appBuilder)
+        {
+            return appBuilder.ConfigureFonts(fontManager =>
+            {
+                fontManager.AddFontCollection(new InterFontCollection());
+            });
+        }
+    }
+}

src/Avalonia.Fonts.Inter/Avalonia.Fonts.Inter.csproj

@@ -8,6 +8,7 @@
   </ItemGroup>
   <ItemGroup>
     <ProjectReference Include="..\Avalonia.Base\Avalonia.Base.csproj" />
+    <ProjectReference Include="..\Avalonia.Controls\Avalonia.Controls.csproj" />
   </ItemGroup>
   <Import Project="..\..\build\BuildTargets.targets" />
 </Project>