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+using System.Linq;
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+using Avalonia.Controls;
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+using Avalonia.Controls.Primitives;
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+using Avalonia.Controls.Templates;
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+using Avalonia.Media;
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+using Avalonia.Styling;
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+using Avalonia.UnitTests;
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+using Avalonia.VisualTree;
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+using Xunit;
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+
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+namespace Avalonia.Base.UnitTests.Styling;
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+
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+public class StyledElementTests_Theming
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+{
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+ public class InlineTheme
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+ {
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+ [Fact]
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+ public void Theme_Is_Applied_When_Attached_To_Logical_Tree()
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+ {
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+ using var app = UnitTestApplication.Start(TestServices.RealStyler);
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+ var target = CreateTarget();
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+
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+ Assert.Null(target.Template);
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+
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+ var root = CreateRoot(target);
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+ Assert.NotNull(target.Template);
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+
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+ var border = Assert.IsType<Border>(target.VisualChild);
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+ Assert.Equal(border.Background, Brushes.Red);
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+
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+ target.Classes.Add("foo");
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+ Assert.Equal(border.Background, Brushes.Green);
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+ }
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+
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+ [Fact]
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+ public void Theme_Is_Detached_When_Theme_Property_Cleared()
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+ {
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+ using var app = UnitTestApplication.Start(TestServices.RealStyler);
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+ var target = CreateTarget();
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+ var root = CreateRoot(target);
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+
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+ Assert.NotNull(target.Template);
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+
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+ target.Theme = null;
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+ Assert.Null(target.Template);
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+ }
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+
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+ [Fact]
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+ public void Theme_Is_Applied_On_Layout_After_Theme_Property_Changes()
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+ {
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+ using var app = UnitTestApplication.Start(TestServices.RealStyler);
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+ var target = new ThemedControl();
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+ var root = CreateRoot(target);
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+
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+ Assert.Null(target.Template);
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+
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+ target.Theme = CreateTheme();
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+ Assert.Null(target.Template);
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+
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+ root.LayoutManager.ExecuteLayoutPass();
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+
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+ var border = Assert.IsType<Border>(target.VisualChild);
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+ Assert.NotNull(target.Template);
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+ Assert.Equal(border.Background, Brushes.Red);
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+ }
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+
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+ private static ThemedControl CreateTarget()
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+ {
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+ return new ThemedControl
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+ {
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+ Theme = CreateTheme(),
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+ };
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+ }
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+
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+ private static TestRoot CreateRoot(IControl child)
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+ {
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+ var result = new TestRoot(child);
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+ result.LayoutManager.ExecuteInitialLayoutPass();
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+ return result;
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+ }
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+ }
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+
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+ public class ThemeFromStyle
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+ {
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+ [Fact]
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+ public void Theme_Is_Applied_When_Attached_To_Logical_Tree()
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+ {
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+ using var app = UnitTestApplication.Start(TestServices.RealStyler);
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+ var target = CreateTarget();
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+
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+ Assert.Null(target.Theme);
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+ Assert.Null(target.Template);
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+
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+ var root = CreateRoot(target);
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+
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+ Assert.NotNull(target.Theme);
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+ Assert.NotNull(target.Template);
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+
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+ var border = Assert.IsType<Border>(target.VisualChild);
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+ Assert.Equal(border.Background, Brushes.Red);
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+
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+ target.Classes.Add("foo");
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+ Assert.Equal(border.Background, Brushes.Green);
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+ }
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+
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+ private static ThemedControl CreateTarget()
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+ {
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+ return new ThemedControl();
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+ }
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+
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+ private static TestRoot CreateRoot(IControl child)
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+ {
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+ var result = new TestRoot()
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+ {
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+ Styles =
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+ {
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+ new Style(x => x.OfType<ThemedControl>())
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+ {
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+ Setters =
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+ {
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+ new Setter(TemplatedControl.ThemeProperty, CreateTheme())
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+ }
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+ }
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+ }
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+ };
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+
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+ result.Child = child;
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+ result.LayoutManager.ExecuteInitialLayoutPass();
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+ return result;
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+ }
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+ }
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+
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+ private static ControlTheme CreateTheme()
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+ {
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+ var template = new FuncControlTemplate<ThemedControl>((o, n) =>
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+ new Border { Name = "PART_Border" });
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+
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+ return new ControlTheme
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+ {
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+ TargetType = typeof(ThemedControl),
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+ Setters =
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+ {
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+ new Setter(ThemedControl.TemplateProperty, template),
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+ },
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+ Children =
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+ {
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+ new Style(x => x.Nesting().Template().OfType<Border>())
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+ {
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+ Setters =
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+ {
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+ new Setter(Border.BackgroundProperty, Brushes.Red),
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+ }
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+ },
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+ new Style(x => x.Nesting().Class("foo").Template().OfType<Border>())
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+ {
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+ Setters =
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+ {
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+ new Setter(Border.BackgroundProperty, Brushes.Green),
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+ }
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+ },
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+ }
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+ };
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+ }
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+
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+ private class ThemedControl : TemplatedControl
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+ {
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+ public IVisual? VisualChild => VisualChildren?.SingleOrDefault();
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+ }
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+}
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