Solved

Scrollbar of memo : scroll down on  opening

Posted on 2007-12-03
14
700 Views
Last Modified: 2008-02-01
Can't  make memo be  on text end instead of start of text.
procedure TForm2.DOreading(Ime:string);
    var
         DATAfile: textfile;
         READline: string;
  begin
     AssignFile(  DATAfile,Ime);
     Reset(  DATAfile);
 
     While not EOF (  DATAfile) do begin
     ReadLn(  DATAfile,READline);
     F.Memo1.Lines.Add (READline);
     end;
              // in this way doesent work
     F.  memo1.SelStart := length(memo1.Text);
     F.memo1.Perform(EM_ScrollCaret,0,0);
     
 
CloseFile( DATAfile);
 
  end;

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Question by:pr2501
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14 Comments
 
LVL 21

Expert Comment

by:ziolko
ID: 20401377
try this:
  Memo1.Lines.LoadFromFile('C:\readme.txt');
  Memo1.SelStart := Length(Memo1.Lines.Text) - 1;
  Memo1.SelLength := 1;


ziolko.
0
 

Author Comment

by:pr2501
ID: 20401525

procedure TForm2.DOreading(Ime:string);
    var
         DATAfile: textfile;
         READline: string;
  begin
     AssignFile(  DATAfile,Ime);
     Reset(  DATAfile);
 
     While not EOF (  DATAfile) do begin
     ReadLn(  DATAfile,READline);
     F.Memo1.Lines.Add (READline);
     end;
              // in this way doesent work
   Memo1.SelStart := Length(Memo1.Lines.Text) - 1;
  Memo1.SelLength := 1;
 
 
CloseFile( DATAfile);
 
  end;

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0
 

Author Comment

by:pr2501
ID: 20401536


Can't make to work it in code before.

Problem if the text of memo has more lines that  memo is large:i can
see first par of text- not last.
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LVL 21

Expert Comment

by:ziolko
ID: 20401660
do you have scrollbars on your memo? if so then where are they positioned after setting Selstart and SelLength?

ziolko.
0
 

Author Comment

by:pr2501
ID: 20401749
 on the top
0
 
LVL 21

Expert Comment

by:ziolko
ID: 20401770
you can use Memo1.Lines.LoadFromFile() instead of AssignFile()

and this works for me just fine:

procedure TForm1.Button1Click(Sender: TObject);
begin
  Memo1.Lines.LoadFromFile('c:\text.txt');
  Memo1.SelStart := Length(Memo1.Lines.Text) - 1;
  Memo1.SelLength := 1;
  Memo1.SetFocus;
end;

ziolko.
0
 

Author Comment

by:pr2501
ID: 20401945
In may code (code snippet) can't  do scrollbar go down.

I have added scrollbar from  memo Properties: scrollbas ssvertical.  













procedure TForm2.DOread(Ime:string);
    begin
  Memo1.Lines.LoadFromFile('c:\text.txt');
  Memo1.SelStart := Length(Memo1.Lines.Text) - 1;
  Memo1.SelLength := 1;
  Memo1.SetFocus;
end;

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Author Comment

by:pr2501
ID: 20401983


 sorry i was to fast
procedure TForm2.DOread(Ime:string);

the IME wasn't  the c:\text.txt'

I have to work on it.

Thank you
0
 

Author Comment

by:pr2501
ID: 20402007

For itch speedButon i have to read deferent file.
Can you see  the reason way it hasn't work from next code:


 
procedure TForm2.FormShow(Sender: TObject);
   begin
      DOread   ('C:\PC1\Montaza\'+TSpeedButton(Sp).Caption+'\'+TSpeedButton(Sp).Caption+'.txt');
   end;
end.
 
procedure TForm2.DOread(Name:string);
    begin
  Memo1.Lines.LoadFromFile(Name);
  Memo1.SelStart := Length(Memo1.Lines.Text) - 1;
  Memo1.SelLength := 1;
  Memo1.SetFocus;
end

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LVL 21

Expert Comment

by:ziolko
ID: 20402023
first of all validate that this
'C:\PC1\Montaza\'+TSpeedButton(Sp).Caption+'\'+TSpeedButton(Sp).Caption+'.txt'
points to existing file.


ziolko.
0
 
LVL 21

Expert Comment

by:ziolko
ID: 20402036
and use OnActivate instead of OnShow, OnActivate guarantees you that all components are properly created and ready to take user input

ziolko.
0
 

Author Comment

by:pr2501
ID: 20402048

It exist because i can read text into memo.

But the vertical scrollbar is  still positioned  the top.
0
 
LVL 21

Accepted Solution

by:
ziolko earned 125 total points
ID: 20402078
call DoRead routine in OnActivate event handler not OnShow

ziolko.
0
 

Author Comment

by:pr2501
ID: 20402087
 thank you
it's Ok
0

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