Re: [flexcoders] Re: need strategy for filtering ArrayCollections in a Cairngorm app

[Tom Bray]

Thanks, Tim.  That makes sense but there's one limitation I'm not sure how to work around. That master Array of users is going to be constantly updated by the server to show who's currenlty online.  Since an Array isn't bindable, how would you propagate changes from that Array to the filtered ArrayCollections that use it as their source?
-TomOn 6/9/06, Tim Hoff <[EMAIL PROTECTED]> wrote:









  


    
            Hey Tom,

In response to this question and the BindingUtils and 
ArrayCollection.filter question, I offer this suggestion.  In the 
ModelLocator maintain a single master Array of all the users.  Then 
in each instance of your view components, create a new bound 
ArrayCollection (dataProvider), with the master Array as the 
underlying source.  Each of the ArrayCollections will have a 
different filterFunction based on the type of view component that is 
instantiated.  Because the ArrayCollections don't actually contain 
any data, just pointers to the underlying Array, I would handle the 
ArrayCollections and filterFunctions in viewHelpers.  In a sense, 
you would be creating separate sub-sets of the master Array in each 
instance of your views.  If you preferred, you could maintain each 
ArrayCollection (Array of ArrayCollections) in the ModelLocator as 
well.

I hope that this makes sense,
Tim Hoff

--- In flexcoders@yahoogroups.com, "Tom Bray" <[EMAIL PROTECTED]> wrote:
>
> Say my model has an ArrayCollection of all the users that are
> connected to my Flex app.  I then have configurable list views that
> display different subsets of that collection based on different 
user
> properties (gender, age, location, etc.).  Multiple views, multiple
> filters, all being fed from the same master ArrayCollection of all
> connected users.  I even want the user to be able to dynamically
> create new views with different filters.
> 
> Unless there's something I'm missing, each view is going to need 
its
> very own ArrayCollection that has its own filter function set up.  
I'm
> picturing a wrapper class that provides addFilter() and 
removeFilter()
> methods so that the AC's filter function can traverse an array of
> other filters -- kind of a CompoundCommand pattern.
> 
> Assuming that's part of the correct approach, I want my master AC 
to
> pump changes out to the filtering ACs which pump changes out to the
> views.  Is there a way to make the binding mechanism work for this?
> Is there a simpler approach I'm overlooking?
> 
> Any tips you can send my way would be greatly appreciated.
> 
> Thanks,
> 
> Tom
>


      

    
    












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