XAML-Map-Control/MapUiTools/Shared/HyperlinkText.cs

using System;
using System.Collections.Generic;
using System.Text.RegularExpressions;
#if WPF
using System.Diagnostics;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
#elif WINUI
using Microsoft.UI.Xaml;
using Microsoft.UI.Xaml.Controls;
using Microsoft.UI.Xaml.Documents;
#elif UWP
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;
using Windows.UI.Xaml.Documents;
#elif AVALONIA
using Avalonia;
using Avalonia.Controls;
using Avalonia.Controls.Documents;
using Avalonia.Media;
using DependencyProperty = Avalonia.AvaloniaProperty;
#endif

namespace MapControl.UiTools;

public static class HyperlinkText
{
    private static readonly Regex regex = new Regex(@"\[([^\]]+)\]\(([^\)]+)\)");

    /// <summary>
    /// Converts text containing hyperlinks in markdown syntax [text](url)
    /// to a collection of Run and Hyperlink inlines.
    /// </summary>
    public static IEnumerable<Inline> TextToInlines(this string text)
    {
        var inlines = new List<Inline>();

        while (!string.IsNullOrEmpty(text))
        {
            var match = regex.Match(text);

            if (match.Success &&
                match.Groups.Count == 3 &&
                Uri.TryCreate(match.Groups[2].Value, UriKind.Absolute, out Uri uri))
            {
                inlines.Add(new Run
                {
                    Text = text.Substring(0, match.Index),
#if WPF || AVALONIA
                    BaselineAlignment = BaselineAlignment.Center
#endif
                });

                text = text.Substring(match.Index + match.Length);

                var hyperlinkText = match.Groups[1].Value;
#if AVALONIA
                var button = new HyperlinkButton
                {
                    Content = hyperlinkText,
                    NavigateUri = uri,
                    Padding = new Thickness(0),
                    Margin = new Thickness(0)
                };

                var link = new InlineUIContainer
                {
                    Child = button,
                    BaselineAlignment = BaselineAlignment.Center
                };
#else
                var run = new Run { Text = hyperlinkText };
                var link = new Hyperlink { NavigateUri = uri };
                link.Inlines.Add(run);
#if WPF
                run.BaselineAlignment = BaselineAlignment.Center;
                link.BaselineAlignment = BaselineAlignment.Center;
                link.ToolTip = uri.ToString();
                link.RequestNavigate += (_, e) =>
                {
                    try
                    {
                        Process.Start(new ProcessStartInfo(e.Uri.ToString()) { UseShellExecute = true });
                    }
                    catch (Exception ex)
                    {
                        Debug.WriteLine($"{e.Uri}: {ex}");
                    }
                };
#endif
#endif
                inlines.Add(link);
            }
            else
            {
                inlines.Add(new Run { Text = text });
                text = null;
            }
        }

        return inlines;
    }

    public static readonly DependencyProperty InlinesSourceProperty =
        DependencyPropertyHelper.RegisterAttached<string>("InlinesSource", typeof(HyperlinkText), null,
            (element, oldValue, newValue) =>
            {
                if (element is TextBlock textBlock)
                {
                    textBlock.Inlines.Clear();

                    foreach (var inline in TextToInlines(newValue))
                    {
                        textBlock.Inlines.Add(inline);
                    }
                }
            });

    public static string GetInlinesSource(TextBlock element)
    {
        return (string)element.GetValue(InlinesSourceProperty);
    }

    public static void SetInlinesSource(TextBlock element, string value)
    {
        element.SetValue(InlinesSourceProperty, value);
    }
}