Solved

Get Line/Column from Memo Position and the reverse.

Posted on 2004-09-18
4
288 Views
Last Modified: 2010-04-05
I've got a memo, some text in it, and I need to set the cursor to a specific line and a specific column. So how do I get the value I need for SelStart?
The reverse operation would also be interesting. What I basically need is:
function MemoPositionToLineColumn(M: TMemo; Position: Integer): TPoint;
function LineColumntToMemoPosition(M: TMemo; LineColumn: TPoint): Integer;

Thanks for your answers.
0
Comment
Question by:Shellman
  • 2
4 Comments
 
LVL 6

Accepted Solution

by:
vadim_ti earned 100 total points
ID: 12092341
function MemoPositionToLineColumn(M: TMemo; Position: Integer): TPoint;
var
  pp:TPoint;
  i, Line, Col: Integer;
begin
  i:=0; Line := 0; Col := 0;
  while position >= Length(M.Lines[i])+2 do begin
    inc(Line);
    Dec(position, Length(M.Lines[i])+2);
    Inc(i);
  end;
  col := position;
  pp.X := Line; pp.Y := Col;
  result := pp;
end;

function LineColumntToMemoPosition(M: TMemo; LineColumn: TPoint): Integer;
var
  i, Line, Col: Integer;
begin
  Line := LineColumn.X;
  Col := LineColumn.Y;
  i:=0; result := Col;
  while i < Line do begin
    Inc(result, Length(M.Lines[i])+2);
    Inc(i);
  end;
end;

0
 
LVL 27

Expert Comment

by:kretzschmar
ID: 12092597
just from head

function MemoPositionToLineColumn(M: TMemo; Position: Integer): TPoint;
begin
  Result := Point(-1,-1);
  If Assgined(M) then
    M.Perform(EM_POSFROMCHAR,integer(result),m.SelStart);
end;


function LineColumntToMemoPosition(M: TMemo; LineColumn: TPoint): Integer;
begin
  result := -1;
  If Assgined(M) then
    result := m.Perform(EM_CHARFROMPOS,0,Integer(LineColumn ));
end;

just from head, not tested, maybe the conversions are not right

meikl ;-)
0
 
LVL 26

Expert Comment

by:EddieShipman
ID: 12123234
Here's some code I wrote to get the row, column in a Memo, use it to your delight:

function RichRow(m: TCustomMemo): Longint;
begin
  Result := m.PerForm(EM_LINEFROMCHAR,m.SelStart,0);
end;

function RichCol(m: TCustomMemo; Row: Integer): Longint;
begin
  Result := m.SelStart-m.Perform(EM_LINEINDEX,Row,0);
end;

procedure TForm1.Memo1KeyUp(Sender: TObject; var Key: Word;
  Shift: TShiftState);
var
  Memo: TMemo;
  Row: Integer;
  Col: Integer;
begin
  Memo := TMemo(Sender);
  Row := RichRow(Memo);
  Col := RichCol(Memo, Row);
  Caption := Format('%d : %d', [Row, Col]);
  StatusBar1.Panels.Items[sbpPosition].Text := Format('%d : %d',
           [Row, Col]);
end;

procedure TForm1.Memo1MouseDown(Sender: TObject; Button: TMouseButton;
  Shift: TShiftState; X, Y: Integer);
var
  Memo: TMemo;
  Row: Integer;
  Col: Integer;
begin
  Memo := TMemo(Sender);
  Row := RichRow(Memo);
  Col := RichCol(Memo, Row);
  Caption := Format('%d : %d', [Row, Col]);
  StatusBar1.Panels.Items[sbpPosition].Text := Format('%d : %d',
           [Row, Col]);
end;
0
 
LVL 26

Expert Comment

by:EddieShipman
ID: 12123245
Oh, sbpPosition is a constant that tells me which Panel to place the text in a multi-panel statusbar.
0

Featured Post

Maximize Your Threat Intelligence Reporting

Reporting is one of the most important and least talked about aspects of a world-class threat intelligence program. Here’s how to do it right.

Join & Write a Comment

Creating an auto free TStringList The TStringList is a basic and frequently used object in Delphi. On many occasions, you may want to create a temporary list, process some items in the list and be done with the list. In such cases, you have to…
Introduction Raise your hands if you were as upset with FireMonkey as I was when I discovered that there was no TListview.  I use TListView in almost all of my applications I've written, and I was not going to compromise by resorting to TStringGrid…
Internet Business Fax to Email Made Easy - With eFax Corporate (http://www.enterprise.efax.com), you'll receive a dedicated online fax number, which is used the same way as a typical analog fax number. You'll receive secure faxes in your email, fr…
This tutorial demonstrates a quick way of adding group price to multiple Magento products.

746 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

12 Experts available now in Live!

Get 1:1 Help Now