Add OnPlatformExtension.

src/Markup/Avalonia.Markup.Xaml/Avalonia.Markup.Xaml.csproj

@@ -28,6 +28,7 @@
  <Compile Include="MarkupExtensions\CompiledBindings\StrongTypeCastNode.cs" />
  <Compile Include="MarkupExtensions\CompiledBindings\TaskStreamPlugin.cs" />
  <Compile Include="MarkupExtensions\DynamicResourceExtension.cs" />
+ <Compile Include="MarkupExtensions\OnPlatformExtension.cs" />
  <Compile Include="MarkupExtensions\ResolveByNameExtension.cs" />
  <Compile Include="MarkupExtensions\ResourceInclude.cs" />
  <Compile Include="MarkupExtensions\StaticResourceExtension.cs" />
@@ -50,6 +51,7 @@
  <Compile Include="Templates\TreeDataTemplate.cs" />
  <Compile Include="XamlIl\Runtime\IAvaloniaXamlIlParentStackProvider.cs" />
  <Compile Include="XamlIl\Runtime\IAvaloniaXamlIlXmlNamespaceInfoProviderV1.cs" />
+ <Compile Include="XamlIl\Runtime\RuntimePlatformInfo.cs" />
  <Compile Include="XamlIl\Runtime\XamlIlRuntimeHelpers.cs" />
  <Compile Include="XamlLoadException.cs" />
  <Compile Include="..\Avalonia.Markup\Markup\Parsers\BindingExpressionGrammar.cs" />

src/Markup/Avalonia.Markup.Xaml/XamlIl/Runtime/RuntimePlatformInfo.cs

@@ -0,0 +1,46 @@
+using System;
+using System.Runtime.InteropServices;
+
+
+namespace Avalonia.Markup.Xaml.XamlIl.Runtime;
+
+public class RuntimePlatformInfo
+{
+ private static OSPlatform IOS { get; } = OSPlatform.Create("IOS");
+
+ private static OSPlatform Android { get; } = OSPlatform.Create("ANDROID");
+
+ private static OSPlatform Browser { get; } = OSPlatform.Create("BROWSER");
+
+ public static RuntimePlatformInfo Instance { get; } = new();
+
+ private RuntimePlatformInfo()
+ {
+ }
+
+ public bool IsWindows => RuntimeInformation.IsOSPlatform(OSPlatform.Windows);
+
+ public bool IsMacOS => RuntimeInformation.IsOSPlatform(OSPlatform.OSX);
+
+ public bool IsLinux => RuntimeInformation.IsOSPlatform(OSPlatform.Linux);
+
+ public bool IsIOS => RuntimeInformation.IsOSPlatform(IOS);
+
+ public bool IsAndroid => RuntimeInformation.IsOSPlatform(Android);
+
+ public bool IsBrowser => RuntimeInformation.IsOSPlatform(Browser);
+
+ public bool IsDesktop(Size primaryScreenSize) => primaryScreenSize.Width > 1280;
+
+ public bool IsLaptopOrDesktop(Size primaryScreenSize) =>
+ primaryScreenSize.Width > 1024 && primaryScreenSize.Width <= 1280;
+
+ public bool IsTablet(Size primaryScreenSize) =>
+ primaryScreenSize.Width > 768 && primaryScreenSize.Width <= 1024;
+
+ public bool IsMobileLandscape(Size primaryScreenSize) =>
+ primaryScreenSize.Width > 480 && primaryScreenSize.Width <= 768;
+
+ public bool IsMobile(Size primaryScreenSize) =>
+ primaryScreenSize.Width <= 480;
+}

src/Markup/Avalonia.Markup.Xaml/XamlIl/Runtime/XamlIlRuntimeHelpers.cs

@@ -182,6 +182,9 @@ public object GetService(Type serviceType)
  return _nameScope;
  if (serviceType == typeof(IAvaloniaXamlIlParentStackProvider))
  return this;
+ if (serviceType == typeof(RuntimePlatformInfo))
+ return RuntimePlatformInfo.Instance;
+
  return null;
  }