TRichEdit, get vertical scroll bar position...

Hi,

>I need to get a current line if it possible...

Label2.Caption := IntToStr(RichEdit1.CaretPos.Y);

Regards, Geo

And about the scrollbar:

Label3.Caption := IntToStr(GetScrollPos(RichEdit1.Handle, SB_VERT));

Regards, Geo

I need to get current line when mouse cursor held scroll bar and user moving scoll box to up or down.

The current line is where the cursor is (not the mouse pointer). Thus, in your case the current line might not be visible.

If your RichEdit can show 10 lines at the same time which one should be considered 'current'? If it is the first line on the top then F68 gave you the answer:
FirstVisibleLine := RichEdit1.Perform(EM_GETFIRSTVISIBLELINE,0,0);

Hey geobul, I do not need to get first line!

Ok, explain again...

Step-By-step:
1. User start software;
2. User sees rich edit with text;
3. Text is huge, about 100000+ lines;
4. He can not see all text;
5. He hand scroll bar by mouse pointer and moves on NN lines up or down...
6. I NEED TO KNOW WHERE HE IS NOW... Better if this is line number...
7. This line number I can get from scroll bar position but scroll bar position in points;
8. TAKS: I need to know which line is visible now and moves automaticaly on this line
    if text will be changed but another user.

I hope now you understand what I need

You can see a veeeery good example... Open ICQ message window and move cursor in the top window where is the messages history... when you will get message from another member you still will see here text where you are. but if you move scroll bar down and will receive new message, history text will be moved.

That's exactly what I'm trying to explan: your user is nowhere. There are several lines currently visible and you can get the number of the first of them. I hope it becomes more clear now.

Ok, WinXP+SP2, Delphi 7+both service packs...

This code:
---
FirstVisibleLine := RichEdit1.Perform(EM_GETFIRSTVISIBLELINE,0,0);
---
Always returns me 0...

I think better way if I explain it as:

I need function Add which will make same than standard Add but will not move cursor to end of text if user is not there.

OK. A simple example. Drop one Richedit, one Timer, one Label and one Button on a form and apply the following code. RichEdit behaves itself exactly as you've described:

type
  TForm1 = class(TForm)
    RichEdit1: TRichEdit;
    Timer1: TTimer;
    Label1: TLabel;
    Button1: TButton;
    procedure Timer1Timer(Sender: TObject);
    procedure FormCreate(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;
  Counter: integer = 0;

implementation

{$R *.DFM}

procedure TForm1.Timer1Timer(Sender: TObject);
begin
  RichEdit1.Lines.Add(IntToStr(Counter));
  Inc(Counter);
  Label1.Caption := IntToStr(RichEdit1.Perform(EM_GETFIRSTVISIBLELINE,0,0));
end;

procedure TForm1.FormCreate(Sender: TObject);
begin
  RichEdit1.TabStop := false;
end;

end.

Regards, Geo

If you set the HideSelection property of the RichEdit to False, then the Richedit will automatically scroll to newly added text...

Regards
Pierre

Sorry, Just noticed you said: "...will NOT move cursor to end of text if user is not there."

Do something like this:

var SavePos: integer;
begin
  SavePos:= Richedit1.SelStart;
  Richedit1.Lines.Add('SomeText');
  RichEdit.SelStart:= SavePos;
end;

IMHO Ferruccio68 and I answered all the questions here. Please correct me if I'm wrong.

Uh, sorry Ferruccio68... I was waiting additional answers, and forgot about your answer.
Yes, I have changed your code fully, but idea was correct!

Thanks,
Dan