Add border to selected text

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Hello everyone,I encountered such a question. How to add border to the selected text in the richtextbox when a button is clicked. And the border disappeared when clicked again. Could you give me some suggestions?
Thanks.

Posted 20-Jun-10 23:56pm

shujsj2010

Updated 21-Jun-10 0:00am

Abhinav S

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William Winner · Accepted Answer · 2010-06-21T08:00:00

So you're saying that you want to draw a line around the selected text when a button is clicked...is that right?

If so, it's not all that difficult, but you have to understand the RichTextBox somewhat well.

The RichTextBox has a function called GetPositionFromCharIndex which will AFAIK give you the top, left coordinate of the position. So with the positions of the first character in the selection, the character right after the selection, and the largest font width of that selection, you should be able to determine the bounds of the box.

Then, just use the RichTextBox.CreateGraphics and draw the box. To clear it, just invalidate the RichTextBox.