On Sun, 21 Jan 2007 17:37:20 +0300
Al Boldi <[EMAIL PROTECTED]> wrote:
> Mattias Gaertner wrote:
> > Al Boldi <[EMAIL PROTECTED]> wrote:
> > > Vincent Snijders wrote:
> > > > Jesus Reyes schreef:
> > > > > --- Al Boldi <[EMAIL PROTECTED]> escribiظژ:
> > > > >> TListBox: 10k rows in 73sec
> > > > >> TTreeView: 100k rows in 50sec
> > > > >> TMemo: 100k rows in 30sec
> > > > >> TListView: 100k rows in 1.5sec
> > > > >> TStringGrid: 100k rows in 0.5sec
> > > > >
> > > > > Are you sure?, this doesn't match with Mattias mail.
> > > >
> > > > Al, did you set the focused row to the last added rows after
> > > > each 10 rows?
> > >
> > > Here is the code:
> > > ============================
> > > StringGrid1.RowCount:=100002;
> > > i:=0;
> > > repeat
> > > inc(i);
> > > StringGrid1.Cells[0,i]:='tst'+inttostr(i);
> > > until i>100000;
> > > ============================
> >
> > The component is updated several times a second to give the user
> > visual feedback during the compilation progress. At the moment
> > every read line is either added to the TListBox or replacing the
> > last line of the TListBox. So changing RowCount would be called
> > every added line. The message window is using Begin/EndUpdate. It
> > calls them about three times a second. So basically there are a lot
> > of 'change last item', many adds and several Begin/EndUpdates.
> > That's why I tried:
> >
> > StringGrid1.ColCount:=1;
> > StringGrid1.BeginUpdate;
> > for i:=1 to 100000 do begin
> > StringGrid1.RowCount:=i;
>
> This line basically kills TStringGrid.
Yes, but the IDE does not know the number of lines in advance.
Of course it would be possible to write a wrapper to add in bigger
chunks.
> TStringGrid gains it's speed from preallocating the list.
>
> Preallocating the tree in TTreeView could improve its speed a lot.
I doubt that. It already works with exponential growth.
I still wonder why your treeview times are so much slower than mines.
Did you use Begin/EndUpdate?
Mattias
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