RichTextBox ScrollBar Position

Ika AJ

Hi, I' have a richTextBox that display incoming data.

The problem is that, the scrollbar by default stays on the topmost position whereas I want it to scroll down to the latest data coming in which is appended to the bottom of the richTextbox.

And if/when a user scrolls up to the middle position of the box, the scrollbar should NOT scroll to the latest data coming in. Instead, it should just stay on the position the user has scrolled up to.

How do I go about this?

Thanks. Im using C# btw.

8 Replies

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Nilanka Dharmadasa16y ago
Accepted answer
Hi Ika,

You can use the following.

richTextBox1.Select(richTextBox1.TextLength - 1, richTextBox1.TextLength);
richTextBox1.ScrollToCaret();

But you will need a few additional lines to do the exact thing. I wrote a small sample to do the exact thing that you want. Check it.

And please do not forget to tick 'Do you like this answer' check box.
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Hiren Soni16y ago
Accepted answer
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Ika AJ16y ago
Hi,

It works perfectly. :))

I'ld like to add another feature tho.

And that is:
If the user, scolls up, the scrollbar maintains its position even when new data is coming in. (done)
However, should the user position back the scrollbar back to the bottom-most position, it still maintains that position instead of showing the latest data.

I'ld like to know, if it possible for the scrollbar to continue showing the latest data should the user puts it back to the bottom-most position.

Thanks,
Ika.
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Nilanka Dharmadasa16y ago
Hi friend,

My solution works for textboxes except VScroll event. Textbox does not have an event as such. So why don't you use rich text box? If there is no special reason go for richtextbox.
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Ika AJ16y ago
Hi Niki,

It works excellent! Thanks!

Ive another application tho, using TextBox, so instead of writing on:

this.richTextBox1.VScroll, what do i change it to?
this.txtBox1.Scrollbars = "..." (?)

Will it work for textBoxes too?

Thank you so much for ur help!
Appreciate it so much.
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Nilanka Dharmadasa16y ago
Hi friend,

That's what I have done in my code. Didnt you check it? Or is there any problem in that? let me know.
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Ika AJ16y ago
Hi,
thanks everyone.

So, ive added this code and it works! :)
-----------------------------------------------------------------------------------------------------------------------

    txtSendMsg.Select(txtSendMsg.Text.Length - 1, txtSendMsg.Text.Length - 1);
   txtSendMsg.AppendText("");
   txtSendMsg.ScrollToCaret();

   txtSendMsg.Focus();
   txtMsg.Focus();

-----------------------------------------------------------------------------------------------------------------------

I'm still clueless tho as how to not make the scrollbar scrolls to the latest focus, if the user has previously scrolled up to read the incoming data found in the middle of the richtextBox.

Any ideas?
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Lalit M16y ago
try this link

http://codebetter.com/blogs/patricksmacchia/archive/2008/07/07/some-richtextbox-tricks.aspx
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