Hi Tom, A nice way to do this is to create a master that is an ArrayCollection, and then for each of your filtered lists you use a ListCollectionView. When you create your ListCollectionView you pass your master list in as a constructor parameter (because ArrayCollection implements Ilist). You can then add a filter function to each of your filtered lists without affecting the master. Each ListCollectionView will listen to the underlying IList for changes, so these should come through immediately (if they get past the filter!).
There's a very simple demo for beta 3 below. Does this solve your problem? Paul <?xml version="1.0" encoding="utf-8"?> <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"; layout="horizontal" creationComplete="initialise()"> <mx:Script> <![CDATA[ import mx.collections.ArrayCollection; import flash.utils.Timer; [Bindable] public var master : ArrayCollection = new ArrayCollection(); [Bindable] public var slave1 : ListCollectionView = new ListCollectionView(master); [Bindable] public var slave2 : ListCollectionView = new ListCollectionView(master); [Bindable] public var slave3 : ListCollectionView = new ListCollectionView(master); public var value : int = 0; public function initialise() : void { slave1.filterFunction = filterOdd; slave1.refresh(); slave2.filterFunction = filterEven; slave2.refresh(); slave3.filterFunction = filterDivBy5; slave3.refresh(); var timer : Timer = new Timer( 200, 50); timer.addEventListener( "timer", addValue); timer.start(); } public function addValue( event : Event ) : void { master.addItem( ++value ); } public function filterOdd( item : Object ) : Boolean { var value : int = int(item); return value % 2 == 1 } public function filterEven( item : Object ) : Boolean { var value : int = int(item); return value % 2 == 0 } public function filterDivBy5( item : Object ) : Boolean { var value : int = int(item); return value % 5 == 0 } ]]> </mx:Script> <mx:VBox> <mx:Label text="Master List"/> <mx:List dataProvider="{ master }" height="400"/> </mx:VBox> <mx:VBox> <mx:Label id="slave1Label" text="Odd"/> <mx:List dataProvider="{ slave1 }" height="400"/> </mx:VBox> <mx:VBox> <mx:Label id="slave2Label" text="Even"/> <mx:List dataProvider="{ slave2 }" height="400"/> </mx:VBox> <mx:VBox> <mx:Label id="slave3Label" text="Divisible by 5"/> <mx:List dataProvider="{ slave3 }" height="400"/> </mx:VBox> </mx:Application> ________________________________________ From: flexcoders@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of Jeremy Lu Sent: Saturday, June 10, 2006 4:13 AM To: flexcoders@yahoogroups.com Subject: Re: [flexcoders] Re: need strategy for filtering ArrayCollections in a Cairngorm app very interesting... why not trigger a global "ArrayChangedEvent" so each fitlered ArrayCollection can update itself according to it ? (with some binding settings this should be feasible) the trigger point is: when new data are pushed into MasterArray, dispatch it. Tom: if you have some sample code, I can give it a try. On 6/10/06, Tim Hoff <[EMAIL PROTECTED]> wrote: I'll have to take your word on that, but I'm still skeptical. If what you say is true, then you could still use the same approach, but instead have the view listen for updates to the masterArray in the ModelLocator. You could do this either by using the changWatcher utility or Paul Williams' Observe tag: http://weblogs.macromedia.com/paulw/ When your view hears a change to the masterArray, you would then refresh the ArrayCollection. It's a little cumbersome, but since direct binding doesn't want to work for you, it might be a necessary step. -TH --- In flexcoders@yahoogroups.com, "Tom Bray" <[EMAIL PROTECTED]> wrote: > > Thanks for trying. An ArrayCollection will not reflect changes made > directly to its source array, so new items pushed onto masterArray do not > show up in my views. > > -Tom > > On 6/9/06, Tim Hoff [EMAIL PROTECTED] wrote: > > > > Changes to the masterArray in the ModelLocator should be > > automatically reflected in the AC if you use either of the binding > > methods I posted. If not, sorry. That's all I have. > > > > > > -TH > > > > --- In flexcoders@yahoogroups.com <flexcoders%40yahoogroups.com>, "Tom > > Bray" tombray@ wrote: > > > > > > The problem is that changes to ModelLocator.getInstance > > ().masterArray don't > > > update the views' dataProviders. In other words, the > > ArrayCollections that > > > use masterArray as their source don't know when new items are > > added to or > > > removed from masterArray. That's why I was thinking that > > masterArray would > > > actually be masterArrayCollection and I'd bind each of the view's > > > dataProvider ACs to it so they could stay in sync. I bound the > > master AC to > > > the sub ACs using BindingUtils and was surprised to see the filter > > function > > > on the sub ACs affect the master AC. I posted sample code here: > > > http://groups.yahoo.com/group/flexcoders/message/39064?l=1 > > > > > > Thanks again! > > > > > > -Tom > > > > > > On 6/9/06, Tim Hoff TimHoff@ wrote: > > > > > > > > > > > > Something like this should do the trick: > > > > > > > > <mx:Script> > > > > <![CDATA[ > > > > > > > > import mx.collections.ArrayCollection; > > > > import org.ets.main.code.model.ModelLocator; > > > > > > > > [Bindable] > > > > public var viewDataProvider : ArrayCollection; > > > > viewDataProvider=new > > > > ArrayCollection({ModelLocator.getInstance().masterArray}); > > > > > > > > ]]> > > > > </mx:Script> > > > > > > > > -TH > > > > > > > > > > > > --- In flexcoders@yahoogroups.com > > > > <flexcoders%40yahoogroups.com><flexcoders% > > 40yahoogroups.com>, "Tom > > > > Bray" <tombray@> wrote: > > > > > > > > > > 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? > > > > > > > > > > -Tom > > > > > > > > > > On 6/9/06, Tim Hoff TimHoff@ 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 > > > > > > <flexcoders%40yahoogroups.com><flexcoders% > > 40yahoogroups.com ><flexcoders%40yahoogroups.com>, > > > > > > > > > > "Tom > > > > > > Bray" tombray@ 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 > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > ------------------------ Yahoo! Groups Sponsor --------------------~--> Get to your groups with one click. Know instantly when new email arrives http://us.click.yahoo.com/.7bhrC/MGxNAA/yQLSAA/nhFolB/TM --------------------------------------------------------------------~-> -- Flexcoders Mailing List FAQ: http://groups.yahoo.com/group/flexcoders/files/flexcodersFAQ.txt Search Archives: http://www.mail-archive.com/flexcoders%40yahoogroups.com Yahoo! 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