Wpf RichTextBox

PLease let me know if anything else required. I'd be happy to help.

Step 1: Create a New WPF Application

1. Open Visual Studio.
2. Create a new WPF Application project.

Step 2: Add a RichTextBox to Your XAML

In your MainWindow.xaml, add a RichTextBox:

        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="350" Width="525">
   
       
   

Step 3: Code Behind to Detect and Convert URLs

In your MainWindow.xaml.cs, add the logic to detect and convert URLs into clickable hyperlinks:

using System.Text.RegularExpressions;
using System.Windows;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;

namespace YourNamespace
{
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();

            richTextBox.PreviewKeyDown += RichTextBox_PreviewKeyDown;
        }

        private void RichTextBox_PreviewKeyDown(object sender, KeyEventArgs e)
        {
            if (e.Key == Key.V && (Keyboard.Modifiers & ModifierKeys.Control) == ModifierKeys.Control)
            {
                e.Handled = true;
                PasteAndConvertUrls();
            }
        }

        private void PasteAndConvertUrls()
        {
            var textRange = new TextRange(richTextBox.Document.ContentEnd, richTextBox.Document.ContentEnd);
            textRange.Text = Clipboard.GetText();

            ConvertUrlsToHyperlinks(richTextBox.Document);
        }

        private void ConvertUrlsToHyperlinks(FlowDocument document)
        {
            var text = new TextRange(document.ContentStart, document.ContentEnd).Text;

            var regex = new Regex(@"(http|https):\/\/[^\s/$.?#].[^\s]*", RegexOptions.IgnoreCase);
            var matches = regex.Matches(text);

            foreach (Match match in matches)
            {
                var hyperlink = new Hyperlink
                {
                    NavigateUri = new Uri(match.Value),
                    Foreground = Brushes.Blue
                };
                hyperlink.Inlines.Add(match.Value);
                hyperlink.RequestNavigate += Hyperlink_RequestNavigate;

                var start = document.ContentStart;
                while (start != null && start.CompareTo(document.ContentEnd) < 0)
                {
                    if (start.GetPointerContext(LogicalDirection.Forward) == TextPointerContext.Text)
                    {
                        var textRun = start.GetTextInRun(LogicalDirection.Forward);
                        var index = textRun.IndexOf(match.Value);
                        if (index >= 0)
                        {
                            var selectionStart = start.GetPositionAtOffset(index, LogicalDirection.Forward);
                            var selectionEnd = selectionStart.GetPositionAtOffset(match.Value.Length, LogicalDirection.Forward);
                            var textRange = new TextRange(selectionStart, selectionEnd);
                            textRange.Text = string.Empty;

                            var inlineContainer = new InlineUIContainer(hyperlink);
                            selectionStart.InsertTextInRun(match.Value);
                            selectionStart.Parent.InsertAfter(inlineContainer, selectionStart);
                            break;
                        }
                    }
                    start = start.GetNextContextPosition(LogicalDirection.Forward);
                }
            }
        }

        private void Hyperlink_RequestNavigate(object sender, System.Windows.Navigation.RequestNavigateEventArgs e)
        {
            System.Diagnostics.Process.Start(new System.Diagnostics.ProcessStartInfo(e.Uri.AbsoluteUri) { UseShellExecute = true });
            e.Handled = true;
        }
    }
}
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Explanation

1. Handling Paste Event:

   • RichTextBox_PreviewKeyDown: This event handler detects when the user pastes text (Ctrl+V) into the RichTextBox. It then calls PasteAndConvertUrls.

2. Pasting and Converting URLs:

   • PasteAndConvertUrls: This method pastes the clipboard text into the RichTextBox and calls ConvertUrlsToHyperlinks to convert URLs to hyperlinks.

3. Converting Text to Hyperlinks:

   • ConvertUrlsToHyperlinks: This method uses a regular expression to find URLs in the text and converts them into Hyperlink elements. The Hyperlink elements are then added to the RichTextBox.

4. Handling Hyperlink Clicks:

   • Hyperlink_RequestNavigate: This event handler opens the URL in the default web browser when the hyperlink is clicked.

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By following these steps, you can enable pasting URLs into a WPF RichTextBox and making them clickable to navigate to the respective web pages.