Never mind, I figured a way round it.
--- In [email protected], "reflexactions"
<[EMAIL PROTECTED]> wrote:
>
> I seem to get a problem when I tried this optimisation, basically
say
> a cell changes its text color to white when selected and back to
> black when not.
>
> What seems to happen is that it changes to white but not back to
> black and therefore the cell "dissapears".
>
> Doesnt seem to happen all the time and for some reason it seems to
> happen more if you type something in a cell then click the
horizontal
> scrollbar then click another row.
>
> I think this is because UITextField dont really support deferred
> validation, invalidateDisplay() will not automatically revalidate
> like it will with UIComponents so any style changes wont be
affected
> until you explicitly call validateNow...
>
>
>
>
> --- In [email protected], "Doug McCune" <doug@> wrote:
> >
> > heh, my bad about the comments in that block of code, I copied
and
> pasted
> > without really reading :) To be diplomatic let's just say I have
> complex
> > emotions when it comes to the work that was done on the ADG, and
> that I
> > don't in fact hate anyone anywhere in the world.
> >
> > On Thu, Sep 4, 2008 at 8:51 AM, Doug McCune <doug@> wrote:
> >
> > > the class has a bunch of other stuff in it too (we needed some
> further
> > > display customization), but it's pretty straightforward. The
> > > updateDisplayOfItemRenderer method was overriden like so:
> > >
> > > override protected function
> > > updateDisplayOfItemRenderer(r:IListItemRenderer):void
> > > {
> > > if (r is IInvalidating)
> > > {
> > > var ui:IInvalidating = IInvalidating(r);
> > > ui.invalidateDisplayList();
> > > //dear Flex team in India: I hate you.
> > > // ui.validateNow();
> > > }
> > > }
> > >
> > > and then I copied/pasted the entire drawCellItem() method and
> commented out
> > > the call to validateNow() that occurs in the lower part of that
> function.
> > > Give that a whirl and let me know if it helps with performance.
> > >
> > > Doug
> > >
> > >
> > > On Thu, Sep 4, 2008 at 8:46 AM, Adrian Williams <adrianw@
> > > > wrote:
> > >
> > >> Hi Doug,
> > >>
> > >> This makes sense. It's staggering that the validateNow()
is
> being
> > >> called basically on every cell....
> > >>
> > >> In hope of avoiding recreating the wheel, would you be
> willing to
> > >> share your extended code with me so I can give it a whirl and
> see if it
> > >> remedies the problem?
> > >>
> > >> Thanks!
> > >> Adrian
> > >>
> > >> Doug McCune wrote:
> > >>
> > >> There are a few places within the ADG code where the code
loops
> over
> > >> every single item renderer and needlessly (or at least
> excessively) calls
> > >> validateNow() on each renderer. That forces the renderers to
> each relayout
> > >> and draw themselves and does not allow the delayed layout
> processing that
> > >> the framework is supposed to allow.
> > >>
> > >> See the updateDisplayOfItemRenderer() method in
> AdvancedDataGridBase and
> > >> you'll find this function:
> > >> protected function updateDisplayOfItemRenderer
> (r:IListItemRenderer):void
> > >> {
> > >> if (r is IInvalidating)
> > >> {
> > >> var ui:IInvalidating = IInvalidating(r);
> > >> ui.invalidateDisplayList();
> > >> ui.validateNow();
> > >> }
> > >> }
> > >>
> > >> that gets run waaay too often.
> > >>
> > >> Also see the drawCellItem() method of AdvancedDataGrid, which
> down at the
> > >> bottom of the method has this call:
> > >>
> > >> if (item is IFlexDisplayObject)
> > >> {
> > >> if (item is IInvalidating)
> > >> {
> > >> IInvalidating(item).invalidateDisplayList();
> > >> IInvalidating(item).validateNow();
> > >> }
> > >> }
> > >>
> > >> So basically every time your data grid is redrawing itself it
> takes way
> > >> longer than it should. I created an extended version of ADG
and
> overrode
> > >> those two methods (had to copy/paste most of the drawCellItem
> method) and I
> > >> removed the calls to validateNow, seemed to speed things up a
> lot.
> > >>
> > >> Doug
> > >>
> > >> On Thu, Sep 4, 2008 at 8:06 AM, Adrian Williams <
> > >> adrianw@> wrote:
> > >>
> > >>> All,
> > >>>
> > >>> I am seeing some incredible lag while using a couple of
> simple panels
> > >>> and a complex ADG. While I love the flexibility and power of
> Flex/AS and
> > >>> the ADG, I really need to overcome these performance
problems
> or the
> > >>> project will sink.
> > >>>
> > >>> My ADG has approx. 100 columns with approx. 200 rows, in
a
> grouping
> > >>> collection that contains approx 30 groups.
> > >>>
> > >>> I suspect the lag I am seeing has to do with the
redrawing
> of the
> > >>> rows. Whenever I scroll or collapse/expand the nodes, it
takes
> between 1/2
> > >>> to 1 second for the action to complete. And this isn't even
a
> very large
> > >>> dataset...we have some that have a few thousand rows. I
haven't
> used any
> > >>> item rendering (yet) that would slow the speed down, though I
> have two
> > >>> columns that have style functions attached. All in all, this
is
> about as
> > >>> close to display the raw data as I can get.
> > >>>
> > >>> I have spent some time with the profiler and performance
> monitor and
> > >>> it appears the the code is sound and without memory leaks. I
> have also gone
> > >>> thru to refactor poorly designed code and remove unnecessary
> nestings.
> > >>>
> > >>> So my initial questions with this admittedly somewhat
vague
> problem
> > >>> are:
> > >>>
> > >>> 1.) Is there a way to turn off the animations and would
> doing so
> > >>> help with the speed?
> > >>> 2.) Has anyone else faced this same dilemma and how did
> you overcome
> > >>> the problems?
> > >>>
> > >>> Thanks,
> > >>> Adrian
> > >>>
> > >>>
> > >>
> > >>
> > >
> > >
> >
>
