MarkdownTextBlock: Adds OnMarkdownParsed event

components/MarkdownTextBlock/src/MarkdownParsedEventArgs.cs

@@ -0,0 +1,16 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using Markdig.Syntax;
+
+namespace CommunityToolkit.Labs.WinUI.MarkdownTextBlock;
+
+public sealed class MarkdownParsedEventArgs : EventArgs
+{
+    public MarkdownDocument Document { get; }
+    public MarkdownParsedEventArgs(MarkdownDocument document)
+    {
+        Document = document;
+    }
+}

components/MarkdownTextBlock/src/MarkdownTextBlock.Events.cs

@@ -0,0 +1,19 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+namespace CommunityToolkit.Labs.WinUI.MarkdownTextBlock;
+
+partial class MarkdownTextBlock
+{
+    /// <summary>
+    /// Event raised when a markdown link is clicked.
+    /// </summary>
+    public event EventHandler<LinkClickedEventArgs>? OnLinkClicked;
+
+    /// <summary>
+    /// Event raised when markdown is done parsing, with a complete MarkdownDocument.
+    /// It is always raised before the control renders the document.
+    /// </summary>
+    public event EventHandler<MarkdownParsedEventArgs>? OnMarkdownParsed;
+}

components/MarkdownTextBlock/src/MarkdownTextBlock.xaml.cs

@@ -55,8 +55,6 @@ public MarkdownDocument? MarkdownDocument
         private set => SetValue(MarkdownDocumentProperty, value);
     }
 
-    public event EventHandler<LinkClickedEventArgs>? OnLinkClicked;
-
     internal void RaiseLinkClickedEvent(Uri uri) => OnLinkClicked?.Invoke(this, new LinkClickedEventArgs(uri));
 
     private static void OnConfigChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
@@ -116,6 +114,7 @@ private void ApplyText(bool rerender)
             if (!string.IsNullOrEmpty(Text))
             {
                 this.MarkdownDocument = Markdown.Parse(Text, _pipeline);
+                OnMarkdownParsed?.Invoke(this, new MarkdownParsedEventArgs(this.MarkdownDocument));
                 _renderer.Render(this.MarkdownDocument);
             }
         }