setValue is called whenever the mouse
moves over the cell in case you have different logic for selected or
highlighted. You may want to compare the value being passed into setValue with
the value you already have if the rendering of the value is complex. You can
return quickly if the value hasn’t changed.
The DataGrid will be improved in 2.0, we
haven’t announced any timing.
Matt
Hello,
I used a custom cell renderer in my datagrid. Try
to trace the
behaviour of the setValue method. I saw that it is
called a lot of
time when the mouse moves above the datagrid. Also
if you use the
label functions try to trace the behaviour.
I used the datagrid to display thousands of
records, using label
functions and custom cell renderers. I hoped the
datagrid will be
improved in Flex 2.0.
Someone has an idea about the date of the next
release ?
On 4/24/05, viraf_bankwalla
<[EMAIL PROTECTED]> wrote:
>
>
> David,
>
> The rendering of this grid takes over 20
seconds on a 20 (rows) and
> 30 columns. Yes we have a custom cell
renderer which has two images
> and 3 labels. We have disabled live
scrolling, however as indicated
> it takes approx 20 seconds to render this
grid. I suspect that it
> will take considerably longer on a client
machine.
>
> Any guidance would be appreciated.
>
> Thanks.
>
> - viraf
>
>
> --- In [email protected],
David George <[EMAIL PROTECTED]>
> wrote:
> > Viraf -
> >
> > When you say "each cell in the grid
contains 4 other objects that
> are
> > displayed", it sounds like you are
using a custom cell renderer.
> Is
> > that right?
> >
> > Unfortunately, large DataGrids with
custom cell renderers are a
> known
> > performance issue. I'm afraid I
can't completely solve your
> problem
> > on Flex v1.5. You might want to
turn off live scrolling, so that
> the
> > DataGrid doesn't attempt to constantly
update while the user is
> > dragging the slider thumb.
> >
> > We've already spoken publicly about the
performance improvements
> > coming in Flash Player 8, so it should
be no surprise that
> performance
> > is a major focus of Flex v2.0.
> >
> > Viraf - would you be willing to send us
a copy of your app, so
> that we
> > can use it as a performance test case
for the next release? Or ...
> > even better ... could you create a
simple version of your app that
> > just contains the poorly-performing
DataGrid? If so, please send
> it
> > directly to me at my work address - [EMAIL PROTECTED]
> >
> > Other folks on the list - this is an
open invitation to send along
> > your performance test cases too!
We ordinarily discourage people
> from
> > contacting employees off-list, but I'll
make an exception in this
> > case.
> >
> > Thanks,
> > Dave
> >
> > On 4/13/05, viraf_bankwalla
<[EMAIL PROTECTED]> wrote:
> > >
> > > I have a DataGrid with
approximately 20 rows and 10 columns.
> Each
> > > cell in the grid contains 4
other objects that are displayed.
> When
> > > scrolling vertically the
performance is poor at best. What can
> I do
> > > to improve the performance?
> > >
> > > I am reading the articly on
Macromedia's site - however my
> effectStart
> > > and effectEnd eventHandlers
are not being invoked. I set them
> on a
> > > HBox that contains the grids.
> > >
> > > Thanks.
> > >
> > > - viraf
> > >
> > >
> > >
> > >
> > >
________________________________
> > > Yahoo! Groups Links
> > >
> > >
> > > To visit your group on the web, go
to:
> > > http://groups.yahoo.com/group/flexcoders/
> > >
> > > To unsubscribe from this group,
send an email to:
> > >
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> > >
> > > Your use of Yahoo! Groups is
subject to the Yahoo! Terms of
> Service.
>
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>
>
>
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