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src/Views/Renderers/ThematicBreakRenderer.cs

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+using Avalonia;
+using Avalonia.Controls;
+using Avalonia.Media;
+using Markdig.Syntax;
+
+namespace MarkdownEditor.Views.Renderers;
+
+/// <summary>
+/// Renders markdown thematic breaks (horizontal rules).
+/// </summary>
+public class ThematicBreakRenderer : IMarkdownBlockRenderer
+{
+    private readonly bool _isDarkMode;
+
+    /// <summary>
+    /// Initializes a new instance of the <see cref="ThematicBreakRenderer"/> class.
+    /// </summary>
+    /// <param name="isDarkMode">Whether the current theme is dark mode.</param>
+    public ThematicBreakRenderer(bool isDarkMode = true)
+    {
+        _isDarkMode = isDarkMode;
+    }
+
+    /// <inheritdoc/>
+    public bool CanRender(Block block) => block is ThematicBreakBlock;
+
+    /// <inheritdoc/>
+    public Control? Render(Block block)
+    {
+        if (block is not ThematicBreakBlock)
+        {
+            return null;
+        }
+
+        return new Border
+        {
+            BorderBrush = new SolidColorBrush(Color.Parse(_isDarkMode ? "#555555" : "#CCCCCC")),
+            BorderThickness = new Thickness(0, 1, 0, 0),
+            Margin = new Thickness(0, 10, 0, 10),
+            Height = 1
+        };
+    }
+}
+