AutoDetecting Link in WPF

[Pac_741]

Hello to everyone, I'm having a lot of problems while trying to achieve the following:

I'm developing a Twitter client, and I'd like the update status text field to detect when ever the user wrote a link (for instance if the user entered google.com) insert an hyperlink right away.

I've been working really hard on this, and so far I get the links inserted into a RichtextBox, but whenever a link is located twice in the RichtextBox the link is inserted again between the first link.

Since I'm using a string finder system to a string in the RichtextBox and then check if it is a link or not, whenever I get two same link sin the RichtextBox the first link is located by the search.

I would appreciate if any body could help me, I wouldn't like to make the users manually insert links into the twitter status update field.

[stefanACM]

Bump...
Does anybody have idea how to make it (i have same problem) ?
I making chat app and when Richtextbox update text, and if text have link, its not underlined or anything... its look like classic TEXT ...
Any idea ???
Thanks in advice

[Pac_741]

Bump...
Does anybody have idea how to make it (i have same problem) ?
I making chat app and when Richtextbox update text, and if text have link, its not underlined or anything... its look like classic TEXT ...
Any idea ???
Thanks in advice

I have found a solution by myself already, I will post it later today.

It's simply creating a custom control inherited from RichTextbox and watch text changes event. Matching, comparison,etc..

[stefanACM]

Ok please
Thanks

[Pac_741]

Do you already have a link detection and insertion code ? or it's just the highlighting that's causing problems ?

[stefanACM]

I dont have anything...
When somebody send message on chat, server sending it to all users, and client app append it to RichTextbox...but...it is clearly look like normal text...no underline, no diferent color, no highlight....
So apsolutly no link detection :|

[Pac_741]

Take a look at this code:

private Paragraph ParseLinks (string Source)
        {
            Paragraph Input = new Paragraph(new Run(Source));
 
            char[] Sep = new char[] { ' ' };       
            string[] Words = new TextRange(Input.ContentStart, Input.ContentEnd).Text.Split(Sep);
 
            Input.Inlines.Clear();
            
            for (int i = 0; i < Words.Length; i++)
            {
                if (Words[i].StartsWith("http://") == true ||
                    Words[i].StartsWith("www.") == true ||
                    Words[i].StartsWith("@") == true)
                {
                    #region Http
                    if (Words[i].StartsWith("http://"))
                    {
                        if (i != 0)
                        {
                            //Add Space
                            Input.Inlines.Add(new Run(" "));
                        }
                        Hyperlink m = new Hyperlink(new Run(Words[i]));
                        m.NavigateUri = new Uri(Words[i]);
                        m.Click += new RoutedEventHandler(m_Click);
                        Input.Inlines.Add(m);
                    } 
                    #endregion
                    #region www
                    if (Words[i].StartsWith("www."))
                    {
                        if (i != 0)
                        {
                            //Add Space
                            Input.Inlines.Add(new Run(" "));
                        }
                        Hyperlink m = new Hyperlink(new Run("http://" + Words[i]));
                        m.NavigateUri = new Uri("http://" + Words[i]);
                        m.Click += new RoutedEventHandler(m_Click);
                        Input.Inlines.Add(m);
                    } 
                    #endregion
                    #region @
                    if (Words[i].StartsWith("@"))
                    {
                        if (i != 0)
                        {
                            //Add Space
                            Input.Inlines.Add(new Run(" "));
                        }
                        Hyperlink m = new Hyperlink(new Run(Words[i]));
                        m.NavigateUri = new Uri("http://www.twitter.com/" + Words[i]);
                        m.Click += new RoutedEventHandler(m_Click);
                        Input.Inlines.Add(m);
                    } 
                    #endregion
                }
                else
                {
                    if (i != 0)
                    {
                        //Add Space
                        Input.Inlines.Add(new Run(" "));
                    }
                    Input.Inlines.Add(new Run(Words[i]));
                }
            }
            return Input;
        }

What it doest it detects any given link, or twitter username refs in a source string.

This code is not polished and could have significant improvements.

What you have to do is whenever you set the text for your Richtextbox you use this method to insert the in-lines of the Richtextbox .

[stefanACM]

Wait,
This function adding HYPERLINK on every link in paragraph...
But can you explain me how to do that function everytime when Richtextbox is updated... I know i am using TextChanged event, but i am a bit confused in this WPF how to read complete Richtextbox and than back text edited with this function.
Thanks so much

[Pac_741]

http://msdn.microsoft.com/en-us/libr...wdocument.aspx

There is all the documentation needed to get started with managin WPF Flowdocuments, which are what richboxtextbox controls use.

Good Luck

[Pac_741]

I forgot to say this,

I imagine you are inserting each conversation line in a richtextbox, if that's the case you would have to use binding, but you cannon't bind directly to a richtextbox.

For this I remember doing something about it, but I lost the files on which I had an example, try looking at this:

http://www.fortes.com/2007/bindablerun

http://lmgtfy.com/?q=wpf+bind+flowdocument