I have a RichTextBox
with thousands of lines of text in it. I can easily SET
the first visible line by using ScrollToCaret()
by doing...
this.SelectionStart = this.Find(this.Lines[lineIndex], RichTextBoxFinds.NoHighlight);
this.ScrollToCaret();
But I would like to be able to GET
the first visible line too. Any suggestions?
Here may be what you need:
//get the first visible char index
int firstVisibleChar = richTextBox1.GetCharIndexFromPosition(new Point(0,0));
//get the line index from the char index
int lineIndex = richTextBox1.GetLineFromCharIndex(firstVisibleChar);
//just get the string of the line
string firstVisibleLine = richTextBox1.Lines[lineIndex];
For your comment saying that you want some line accordingly to the Width
of the RichTextBox
, you can do something like this:
int firstVisibleChar = richTextBox1.GetCharIndexFromPosition(new Point(0,0));
int lastChar = richTextBox1.GetCharIndexFromPosition(new Point(richTextBox1.ClientSize.Width - 1, 1));
string firstVisibleLine = richTextBox1.Text.Substring(firstVisibleChar, lastChar - firstVisibleChar);
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