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Using the Rich Edit Component

Posted on 1997-11-27
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Last Modified: 2010-04-04
I would like to use the Rich Edit component to function like a HTML Editor. (i.e. Whatever that is in the '<>' tag will be color coded)

I also need the color coding to be generated whenever a new character is keyed into the Rich Edit component.

Can anyone teach me how to do it?
You time is greatly appretiated
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Question by:ermac
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4 Comments
 
LVL 4

Expert Comment

by:StevenB
ID: 1352152
 You'll probably find this question (still unanswered) interesting, as it is basically the same as yours.

http://www.experts-exchange.com/topics/bin/ShowQ?qid=8630022558

  Steven.
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LVL 8

Expert Comment

by:ZifNab
ID: 1352153
Why don't you just use some components which already implement this?
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Accepted Solution

by:
ahalya earned 200 total points
ID: 1352154
Here is a portion of my code that highlights all "and"s and "or"s in a one line TRichEdit recusively. (i colorize the rich edit on the OnExit event)

if speed is not a big concern then you can do a similar thing
in the onchange event i would guess.

on a line by line basis
   i := find pos of '<'  
   j := pos of '>' starting from i
   highlight from  s[i] to s[j] (see my highlight proc below)
until alldone


procedure TMainForm.RichEditExit(Sender:TObject);

var s    : string;
    i, j : integer;
    SelS, SelL : integer;

procedure HighLight(i, j:integer);

begin;
(Sender As TRichEdit).SelStart := i;
(Sender As TRichEdit).SelLength := j;
(Sender As TRichEdit).SelAttributes.Color := clGrayText;
(Sender As TRichEdit).SelLength := 0;
MainForm.Update;
end;

begin
(Sender As TRichEdit).Text := Trim((Sender As TRichEdit).Text);
SelS :=  (Sender As TRichEdit).SelStart;
SelL :=  (Sender As TRichEdit).SelLength;

s := (Sender As TRichEdit).text;
i := pos(' and ', s);
j := i ;
while i > 0 do
  begin;
  Highlight(j-1, 4);
  Delete(s, 1, i+4);
  i := pos(' and ', s);
  j := j + i + 4;
  end;

s := (Sender As TRichEdit).text;
i := pos(' or ', s);
j := i ;
while i > 0 do
  begin;
  Highlight(j-1, 3);
  Delete(s, 1, i+3);
  i := pos(' or ', s);
  j := j + i + 3;
  end;

(Sender As TRichEdit).SelStart  := SelS;
(Sender As TRichEdit).SelLength := SelL;;
end;


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Author Comment

by:ermac
ID: 1352155
It's works but I think it's a bit too slow...
Any other way to speed it up??
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