feat: add OnHyperLinkClicked callback

Author: noti0nS

MdXaml/Markdown.cs

@@ -81,6 +81,8 @@ public class Markdown : DependencyObject, IMarkdown, IUriContext
 
         public ICommand? HyperlinkCommand { get; set; }
 
+        public HyperLinkClickCallback? OnHyperLinkClicked { get; set; }
+
         public Uri? BaseUri { get; set; }
 
         private MdXamlPlugins? _plugins;
@@ -579,6 +581,18 @@ private Inline TreatsAsHref(Match match)
             var result = Create<Hyperlink, Inline>(PrivateRunSpanGamut(linkText));
             result.CommandParameter = url;
             result.Command = HyperlinkCommand;
+            if (OnHyperLinkClicked is not null)
+            {
+                result.Click += (sender, e) =>
+                {
+                    var hyperlink = sender as Hyperlink;
+                    if (hyperlink is not null)
+                    {
+                        string? url = hyperlink.CommandParameter as string;
+                        OnHyperLinkClicked.Invoke(url!);
+                    }
+                };
+            }
 
             if (!DisabledTootip)
             {
@@ -2148,6 +2162,8 @@ private static TResult Create<TResult, TContent>(IEnumerable<TContent> content)
         #endregion
     }
 
+    public delegate void HyperLinkClickCallback(string url);
+
     internal class ParseParam
     {
         public IBlockParser[] PrimaryBlocks { get; }

MdXaml/MarkdownScrollViewer.cs

@@ -365,6 +365,17 @@ public SyntaxVersion Syntax
             }
         }
 
+        private HyperLinkClickCallback _onHyperLinkClicked;
+        public HyperLinkClickCallback OnHyperLinkClicked
+        {
+            get => _onHyperLinkClicked;
+            set
+            {
+                _onHyperLinkClicked = value;
+                Engine.OnHyperLinkClicked = value;
+            }
+        }
+
         public new FlowDocument? Document
         {
             get
@@ -452,6 +463,7 @@ private void UpdateClickAction()
             }
 
             Engine.HyperlinkCommand = new FlowDocumentJumpAnchorIfNecessary(this, command);
+            Engine.OnHyperLinkClicked = _onHyperLinkClicked;
         }
 
         internal void ScrollTo(string fragment, bool updateSourceProperty)

samples/MdXaml.Demo2/MainWindow.xaml

@@ -1,12 +1,4 @@
-<Window x:Class="MdXaml.Demo2.MainWindow"
-        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
-        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
-        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
-        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
-        xmlns:mdxam="clr-namespace:MdXaml;assembly=MdXaml"
-
-        xmlns:local="clr-namespace:MdXaml.Demo2"
-        mc:Ignorable="d"
+<Window x:Class="MdXaml.Demo2.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" xmlns:local="clr-namespace:MdXaml.Demo2" xmlns:mdxam="clr-namespace:MdXaml;assembly=MdXaml" mc:Ignorable="d"
         Title="MainWindow" Height="450" Width="800">
 
     <Window.DataContext>
@@ -25,9 +17,8 @@
                 <mdxam:MarkdownScrollViewer
                     VerticalAlignment="Stretch"
                     HorizontalAlignment="Stretch"
-                    ClickAction="DisplayWithRelativePath"
-                    Source="{Binding MdSource,Mode=TwoWay}"
-                    />
+                    ClickAction="DisplayWithRelativePath" OnHyperLinkClicked="OnLinkClicked"
+                    Source="{Binding MdSource,Mode=TwoWay}" />
             </DockPanel>
         </TabItem>
 
@@ -39,6 +30,7 @@
                             VerticalAlignment="Stretch"
                             HorizontalAlignment="Stretch"
                             ClickAction="DisplayWithRelativePath"
+                            x:Name="MdCont1"
                             Height="150"
                             Markdown="{Binding Text}"/>
                     </DataTemplate>

samples/MdXaml.Demo2/MainWindow.xaml.cs

@@ -1,5 +1,6 @@
 using System;
 using System.Collections.Generic;
+using System.Diagnostics;
 using System.Linq;
 using System.Text;
 using System.Threading.Tasks;
@@ -24,5 +25,7 @@ public MainWindow()
         {
             InitializeComponent();
         }
+
+        public void OnLinkClicked(string url) => Debug.Print($"URL clicked: {url}");
     }
 }