Adding ListItems to ListView is so s-l-o-w

G Horn

Delphi Developer

Thu, 23 Jan 2003 03:00:00 GMT

Adding ListItems to ListView is so s-l-o-w

Is there a way of improving the perfomance of adding items (and subitems) to
a listview? I am using Items.BeginUpdate and Items.EndUpdate, which do make
a big difference but I want this to be much faster. I have also experimented
with AllocBy, but so far I don't see that it makes any noticable difference.

Pieter van Er

Delphi Developer

Sat, 25 Jan 2003 03:00:00 GMT

Re:Adding ListItems to ListView is so s-l-o-w

Quote

G Horn wrote:
> Is there a way of improving the perfomance of adding items (and subitems) to
> a listview? I am using Items.BeginUpdate and Items.EndUpdate, which do make
> a big difference but I want this to be much faster. I have also experimented
> with AllocBy, but so far I don't see that it makes any noticable difference.

I've solved this problem by filling the listview for only what is visible on
screen. After that, I put in the Application.OnIdle event the code to complete
the listview.

Pieter van Erp

"It ain't over 'till the Fat Lady sings"

M.H. Avegaar

Delphi Developer

Sun, 26 Jan 2003 03:00:00 GMT

Re:Adding ListItems to ListView is so s-l-o-w

Have you tried putting LockWindowUpdate(ListView1.Handle); and
LockWindowUpdate(0); around the insert code ?

"G Horn" <gth...@icon.co.za> schreef in bericht
news:398da365$0$232@hades.is.co.za...

Quote

> Is there a way of improving the perfomance of adding items (and subitems)
to
> a listview? I am using Items.BeginUpdate and Items.EndUpdate, which do
make
> a big difference but I want this to be much faster. I have also
experimented
> with AllocBy, but so far I don't see that it makes any noticable
difference.

G Hor

Delphi Developer

Sun, 26 Jan 2003 03:00:00 GMT

Re:Adding ListItems to ListView is so s-l-o-w

No, I haven't tried what you suggest yet, but isn't that the same as
BeginUpdate and EndUpdate?

Quote

M.H. Avegaart <avega...@NOSPAMmccomm.nl> wrote in message

news:8mr7fe$g1u$1@porthos.nl.uu.net...

Quote

> Have you tried putting LockWindowUpdate(ListView1.Handle); and
> LockWindowUpdate(0); around the insert code ?

> "G Horn" <gth...@icon.co.za> schreef in bericht
> news:398da365$0$232@hades.is.co.za...
> > Is there a way of improving the perfomance of adding items (and
subitems)
> to
> > a listview? I am using Items.BeginUpdate and Items.EndUpdate, which do
> make
> > a big difference but I want this to be much faster. I have also
> experimented
> > with AllocBy, but so far I don't see that it makes any noticable
> difference.

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