I'm using a multi-line
for a simple editor I'm working on. I didn't know how to get the cursor position, so I searched online and found (somewhere):
textbox.GetLineFromCharIndex ( textbox.SelectionStart )
for the line number and
textbox.SelectionStart - textbox.GetFirstCharIndexOfCurrentLine
for the position within the line. And they seemed to work properly until I noticed that I got some negative values for the position within the line when I selected some text.
A little experimentation and exploration resulted in abandoning the
* method in favor of the
method. So now I get the cursor position this way:
public static partial class LibExt
public static System.Drawing.Point
this System.Windows.Forms.TextBox TextBox
int s = TextBox.SelectionStart ;
int y = TextBox.GetLineFromCharIndex ( s ) ;
int x = s - TextBox.GetFirstCharIndexFromLine ( y ) ;
return ( new System.Drawing.Point ( x , y ) ) ;
* It appears that
uses the position of the caret to determine which line is "
", whereas we're trying to use the
BSCS 1992 Wentworth Institute of Technology
Originally from the Boston (MA) area. Lived in SoCal for a while. Now in the Phoenix (AZ) area.
OpenVMS enthusiast, ISO 8601 evangelist, photographer, opinionated SOB, acknowledged contrarian
"If you need help knowing what to think, let me know and I'll tell you." -- Jeffrey Snover [MSFT]
"Typing is no substitute for thinking." -- R.W. Hamming
"I find it appalling that you can become a programmer with less training than it takes to become a plumber." -- Bjarne Stroustrup
ZagNut’s Law: Arrogance is inversely proportional to ability.
"Well blow me sideways with a plastic marionette. I've just learned something new - and if I could award you a 100 for that post I would. Way to go you keyboard lovegod you." -- Pete O'Hanlon
"linq'ish" sounds like "inept" in German -- Andreas Gieriet
"Things would be different if I ran the zoo." -- Dr. Seuss
"Wrong is evil, and it must be defeated." – Jeff Ello
"A good designer must rely on experience, on precise, logical thinking, and on pedantic exactness." -- Nigel Shaw
“It’s always easier to do it the hard way.” -- Blackhart
“If Unix wasn’t so bad that you can’t give it away, Bill Gates would never have succeeded in selling Windows.” -- Blackhart
"Omit needless local variables." -- Strunk... had he taught programming
"We learn more from our mistakes than we do from getting it right the first time."
My first rule of debugging: "If you get a different error message, you're making progress."
My golden rule of database management: "Do not unto others' databases as you would not have done unto yours."
My general rule of software development: "Design should be top-down, but implementation should be bottom-up."