Bind text with links to RichTextBox - windows-phone-7

Question

I need to bind text which may contain hyperlinks to RichTextBox so it could show text as normal text and links as hyperlinks.
For example I have following text:
Join us on social networks
http://www.facebook.com/
I want that links in a text be hyperlinks so the result in RichTextBox would be like this:
Join us on social networks
http://www.facebook.com/

Answer 1

I implemented what I need
using System;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Text.RegularExpressions;
using System.Windows.Media;
namespace NazarGrynko.UI.Controls
{
public class MyRichTextBox : RichTextBox
{
private const string UrlPattern = #"(http|ftp|https):\/\/[\w\-_]+(\.[\w\-_]+)+([\w\-\.,#?^=%&:/~\+#]*[\w\-\#?^=%&/~\+#])?";
public static readonly DependencyProperty TextProperty =
DependencyProperty.Register("Text", typeof (string), typeof(MyRichTextBox ), new PropertyMetadata(default(string), TextPropertyChanged));
public string Text
{
get { return (string) GetValue(TextProperty); }
set { SetValue(TextProperty, value); }
}
private static void TextPropertyChanged(DependencyObject dependencyObject, DependencyPropertyChangedEventArgs dependencyPropertyChangedEventArgs)
{
var richTextBox = (MyRichTextBox)dependencyObject;
var text = (string) dependencyPropertyChangedEventArgs.NewValue;
int textPosition = 0;
var paragraph = new Paragraph();
var urlMatches = Regex.Matches(text, UrlPattern);
foreach (Match urlMatch in urlMatches)
{
int urlOccurrenceIndex = text.IndexOf(urlMatch.Value, textPosition, StringComparison.Ordinal);
if (urlOccurrenceIndex == 0)
{
var hyperlink = new Hyperlink
{
NavigateUri = new Uri(urlMatch.Value),
TargetName = "_blank",
Foreground = Application.Current.Resources["PhoneAccentBrush"] as Brush
};
hyperlink.Inlines.Add(urlMatch.Value);
paragraph.Inlines.Add(hyperlink);
textPosition += urlMatch.Value.Length;
}
else
{
paragraph.Inlines.Add(text.Substring(textPosition, urlOccurrenceIndex - textPosition));
textPosition += urlOccurrenceIndex - textPosition;
var hyperlink = new Hyperlink
{
NavigateUri = new Uri(urlMatch.Value),
TargetName = "_blank",
Foreground = Application.Current.Resources["PhoneAccentBrush"] as Brush
};
hyperlink.Inlines.Add(urlMatch.Value);
paragraph.Inlines.Add(hyperlink);
textPosition += urlMatch.Value.Length;
}
}
if (urlMatches.Count == 0)
{
paragraph.Inlines.Add(text);
}
richTextBox.Blocks.Add(paragraph);
}
}
}
Using example:
<MyRichTextBox Text="{Binding Message}"/>

Answer 2

Parse the Hyperlink, and create following structure (With C#, of course):
<RichTextBlock>
<Run>Hello World!</Run>
<Hyperlink NavigateUri="http://www.stackoverflow.com">http://www.stackoverflow.com</Hyperlink>

Answer 3

Thanks for the solution!
One minor modification I made was right at the end, I replaced the check on the count, with a line that just adds a substring of the full text, this way it does not truncate everything after the last URL, all text is retained.
paragraph.Inlines.Add(text.Substring(textPosition, text.Length - textPosition));
//if (urlMatches.Count == 0)
//{
// paragraph.Inlines.Add(text);
//}