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Position, Execute, FindText, OnFind, SelStart, SelLength example

This example requires a TRichEdit, a TButton, and a TFindDialog.
Clicking the button click will display a Find Dialog to the right of the edit control. Filling in the ´Find what´ text and pressing the Find Next button will select the first matching string in the Rich Edit control that follows the previous selection.

procedure TForm1.Button1Click(Sender: TObject);

begin
FindDialog1.Position := Point(RichEdit1.Left + RichEdit1.Width, RichEdit1.Top);
FindDialog1.Execute;
end;

procedure TForm1.FindDialog1Find(Sender: TObject);
var
FoundAt: LongInt;
StartPos, ToEnd: Integer;
begin
with RichEdit1 do
begin
{ begin the search after the current selection if there is one }
{ otherwise, begin at the start of the text }
if SelLength <> 0 then

StartPos := SelStart + SelLength;
else

StartPos := 0;

{ ToEnd is the length from StartPos to the end of the text in the rich edit control }

ToEnd := Length(Text) - StartPos;

FoundAt := FindText(FindDialog1.FindText, StartPos, ToEnd, [stMatchCase]);
if FoundAt <> -1 then
begin
SetFocus;
SelStart := FoundAt;
SelLength := Length(FindDialog1.FindText);
end;
end;
end;