RichTextBox Line Highlight and Autoscroll

Hello All- I am trying to build a language tool, basically I am getting lines of text into a richtextbox and playing the audio for that line. Things are working great except that I want to highlight the text being played and autoscroll when it plays the next line.

Here is what I am doing I have a button which gets a bunch of audio files from a folder then I get the same lines of text as in the audio from the database and dump them in the richtextbox, then the player plays those lines and the same lines are displayed in the richtextbox.

Code:

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Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click

        AxWindowsMediaPlayer1.currentPlaylist.clear()
        timerDuration.Enabled = False

        Dim oMedia As WMPLib.IWMPMedia

        Dim mp3fileName As String

        Dim d As Integer
        For d = Fromnumber to Tonumber

            mp3fileName = mp3fileName + ".mp3"

                oMedia = AxWindowsMediaPlayer1.newMedia(folderName & "\" & mp3fileName)
                AxWindowsMediaPlayer1.currentPlaylist.appendItem(oMedia)

                'MsgBox(folderName)
            End If

        Next

        timerDuration.Enabled = True
        AxWindowsMediaPlayer1.Ctlcontrols.play()



Dim mySelectQuery As String
        mySelectQuery = "SELECT * from table where (paraID = '" & ID & "')  and lines between '" & FromNumber & "' and '" & ToNumber & "'"
        Dim sqConnection As New SQLiteConnection(connString)
        Dim sqCommand As New SQLiteCommand(mySelectQuery, sqConnection)
        sqCommand.Connection.Open()
        Dim sqReader As SQLiteDataReader = sqCommand.ExecuteReader()

        ExtRichTextBox1.Clear()
        ExtRichTextBox1.SelectionIndent = 15

        If sqReader.HasRows Then
            Do While sqReader.Read()

                ExtRichTextBox1.AppendText(sqReader.GetString(1))
                ExtRichTextBox1.AppendText(Environment.NewLine)

            Loop

        Else
            MsgBox("No rows returned.")
        End If
        sqConnection.Close()
        sqConnection.Dispose()

    End Sub

---

Then I have a timer which keeps track so to get the duration and time etc

Code:

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Private Sub timerDuration_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles timerDuration.Tick

        Dim remain, minutes As Integer
        Dim seconds, elapsedtime As String

        ''Displays length of current playing track or movie.
        lblTime.Text = AxWindowsMediaPlayer1.currentMedia.durationString()

        remain = AxWindowsMediaPlayer1.currentMedia.duration - AxWindowsMediaPlayer1.Ctlcontrols.currentPosition
        minutes = (remain \ 60).ToString("00")
        seconds = (remain Mod 60).ToString("00")
      elapsedtime = minutes & ":" & seconds

        lblDuration.Text = elapsedtime

        Dim rbt As String
        rbt = AxWindowsMediaPlayer1.currentMedia.name
        rbt = rbt.Substring(3)

        lblrbt.Text = rbt

        If AxWindowsMediaPlayer1.playState = WMPPlayState.wmppsStopped Then
            lblTime.Text = "00:00"
            lblDuration.Text = "00:00"
            timerDuration.Enabled = False
            'timerDuration.Stop()
        End If
    End Sub

---

Now my question is how to highlight the text the audio is playing and autoscroll the highlight to the next line when the audio starts the next line.
Or if someone has a similar implementation that I can take notes from will be highly appreciated also.

Thanks for your help guys.

Is there any purpose in putting the lines into a RichTextBox other than using its highlight abilities because this would be much easier in a listbox where you would simply have to obtain the position in the playlist of the current file (I assume that's possible?) and change the Selected Index in the list box accordingly as part of the tick event.

Thanks for the reply, I have never thought of using a listbox, so I am not sure if it will be easier or a nightmare to achieve what I am trying to do. maybe someone with more experience than me would be able to chip in, I have been hung with this problem for quite a while so would really appreciate everyones expertise here. Thanks for all your time.

Hi Guys - Is my request such a nightmare that only one person has responded to it, among all the experts out there, I really dont know where else to go, if you guys tell me to rebuild from scratch I will do it, its just that I need some direction and examples to follow. So please help me I am really stuck out here.

Thanks for the help.

I suspect that were you to show a little more willingness to try the suggestions that have been made to you, more people would be willing to offer advice on implementing them. One interpretation of the absence of further ideas is, after all, that the one you have been given is workable and not in need of any further comment!

I would use a list box... that's what I've done in the past... I forget the name of the property off hand, but there's a property that when set, when something is selected in the listbox, it will scroll into view, if it isn't. Setting that is half the work... from there, all you need to is select each item in the list (set the .SelectedIndex property) ... that will then highlight that line, which will cause it to scroll into view... It's all quite simple and easy.

-tg

I just implemented the listbox feature, seemed cool at first but then I discovered you cant word wrap a listbox, at least I havent found any easy way of doing it.
Now my text can go on more than 10 lines, and if I select the multiline feature in the properties, its just wraps the text, and I havent found a way to seperate the lines say after a full stop, and it just makes you scroll horizontally till the cows come home.

Appreciate your replies guys, but is there a way to wordwrap a listbox without a huge horizontal bar ?