[flexcoders] Re: need strategy for filtering ArrayCollections in a Cairngorm app
Alex, What if the three lists a developer is filtering/sorting are contained within a component? Then doesn't hard coding the values into the ModelLocator defeat the purpose of component independence? You would have to update your model every time you wanted to add an instance of the component, am I tight? I ask because it just so happens I am dealing with this very issue in trying to determine some things about my component design in a Cairngorm app. Thanks.
[flexcoders] Re: need strategy for filtering ArrayCollections in a Cairngorm app
Here's what's funny. I wasn't aware it continued to part III. Thank you, Alex, for answering a question this silly programmer could have found by navigating the thread. :) Welcome to the family! Kenny Silanskas Director of Communications Dillstar Productions
[flexcoders] Re: need strategy for filtering ArrayCollections in a Cairngorm app
What is the matter with me today? Second time, I asked a question there was a clearly published answer for. Ignore me until midnight PST. Otherwise, who knows what chaos I could cause. -Kenny
Re: [flexcoders] Re: need strategy for filtering ArrayCollections in a Cairngorm app
Thanks for the reply, I think the root of the problem is the 'drilldown'
filtering while still keeping things in sync via binding. That or I am just
not thinking about it the right way.
retrieve array from database stored in model.master -
model.slave1, model.slave2, model.slave3 collections created from master
with preliminary filters -
the local view variable slaveData is bound to model.slave1 component
slaveData={model.slave1}/ -
slaveData in the component will get the preliminary filter of the slaveX in
the model, or if I update the user changable filter on slaveData then slaveX
will also have it's preliminary filter changed .
Thats where I'm getting stuck at, creating collections off of 1 retrieval of
data from the db, applying a filter to each collection to pre-sort them into
their category, then allowing the user to filter each category's view
further on their own actions
Is your recommendation to keep 3 master arrays in the model (manually setup
and not with a filterFunction), and when a command to update an item in 1 is
executed, I should have it update the others accordingly via looping or
setItemAt?
Sorry for the long post and my mental road block!
On 12/5/06, Alex Uhlmann [EMAIL PROTECTED] wrote:
Hi Rick,
I havn't read the complete thread below, but since you're saying you're
working in a Cairngorm app, to me this looks like functionality that should
live in either one or multiple model object(s), instead of the view. The
view could just bind to a property (some collection) of that model and
update it via encapuslated API requests aka commands. Would that work for
you?
Best,
Alex
*Alex Uhlmann *
Consultant (Rich Internet Applications)
Adobe Consulting
Westpoint, 4 Redheughs Rigg,
South Gyle, Edinburgh, EH12 9DQ, UK
p: +44 (0) 131 338 6969
m: +44 (0) 7917 428 951
[EMAIL PROTECTED]
http://weblogs.macromedia.com/auhlmann
--
*From:* flexcoders@yahoogroups.com [mailto:[EMAIL PROTECTED] *On
Behalf Of *Rick Schmitty
*Sent:* 05 December 2006 17:01
*To:* flexcoders@yahoogroups.com
*Subject:* Re: [flexcoders] Re: need strategy for filtering
ArrayCollections in a Cairngorm app
To dig up an old thread... How would you go about this if you had a
component that you wanted to reuse for different views of the data
that could be filtered additionally by that view?
I've run into a similar problem Tom had where the filterFunction is
passed along or overwritten. It seems my only choice (good or bad?)
is to have all possible filtering functions in the component and pass
the component some logic on which to use for its 'base' data in
addition to any user filter applied on the already filtered 'base'
data set
Perhaps I'm going about it the wrong way. I've modified Paul's example
below:
?xml version=1.0?
mx:Application xmlns:mx=http://www.adobe.com/2006/mxml;
creationComplete=initialise() xmlns:local=*
mx:Script
![CDATA[
import mx.collections.ArrayCollection;
import mx.collections.ListCollectionView;
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 = filterDivBy10;
slave3.refresh();
var timer : Timer = new Timer( 10, 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 filterDivBy10( item : Object ) : Boolean
{
var value : int = int(item);
return value % 10 == 0
}
]]
/mx:Script
mx:HBox width=100%
mx:VBox
mx:Label text=Master List/
mx:List editable=true dataProvider={ master } height=400/
/mx:VBox
local:slave slaveData={slave1} label=odd/
local:slave slaveData={slave2} label=even/
local:slave slaveData={slave3} label=divisible by 10/
/mx:HBox
/mx:Application
** slave.mxml **
?xml version=1.0 encoding=utf-8?
mx:VBox xmlns:mx=http://www.adobe.com/2006/mxml;
xmlns:ac=com. adobe.ac.util.*
creationComplete=complete() initialize=init()
mx:Script
![CDATA[
import mx.collections.ListCollectionView;
[Bindable]
public var slaveData:ListCollectionView;
public function filterDivBy5(item:Object):Boolean {
var value : int = int(item);
if (filterOn.selected)
return value % 5 == 0
else
return true;
}
private function init():void {
trace(init);
debug();
trace();
}
private function complete():void {
trace(complete);
slaveData.filterFunction
Re: [flexcoders] Re: need strategy for filtering ArrayCollections in a Cairngorm app
object is null);
return;
}
trace(length: +slaveData.length);
if (slaveData.filterFunction==null)
trace(filter function: null);
else if (slaveData.filterFunction==filterDivBy5)
trace(filter function: DivBy5);
else
trace(filter function: parent filter);
}
]]
/mx:Script
mx:Label id=slaveLabel text={this.label}/
mx:List dataProvider={slaveData} height=400 editable=true/
mx:CheckBox id=filterOn label=Filter by Div5 change=filter()/
mx:Button click=debug()/
/mx:VBox
On 6/10/06, Paul Williams [EMAIL PROTECTED] wrote:
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
viewlisten for updates to the masterArray
RE: [flexcoders] Re: need strategy for filtering ArrayCollections in a Cairngorm app
Hi Rick,
I havn't read the complete thread below, but since you're saying you're
working in a Cairngorm app, to me this looks like functionality that
should live in either one or multiple model object(s), instead of the
view. The view could just bind to a property (some collection) of that
model and update it via encapuslated API requests aka commands. Would
that work for you?
Best,
Alex
Alex Uhlmann
Consultant (Rich Internet Applications)
Adobe Consulting
Westpoint, 4 Redheughs Rigg,
South Gyle, Edinburgh, EH12 9DQ, UK
p: +44 (0) 131 338 6969
m: +44 (0) 7917 428 951
[EMAIL PROTECTED]
http://weblogs.macromedia.com/auhlmann
From: flexcoders@yahoogroups.com [mailto:[EMAIL PROTECTED] On
Behalf Of Rick Schmitty
Sent: 05 December 2006 17:01
To: flexcoders@yahoogroups.com
Subject: Re: [flexcoders] Re: need strategy for filtering
ArrayCollections in a Cairngorm app
To dig up an old thread... How would you go about this if you had a
component that you wanted to reuse for different views of the data
that could be filtered additionally by that view?
I've run into a similar problem Tom had where the filterFunction is
passed along or overwritten. It seems my only choice (good or bad?)
is to have all possible filtering functions in the component and pass
the component some logic on which to use for its 'base' data in
addition to any user filter applied on the already filtered 'base'
data set
Perhaps I'm going about it the wrong way. I've modified Paul's example
below:
?xml version=1.0?
mx:Application xmlns:mx=http://www.adobe.com/2006/mxml
http://www.adobe.com/2006/mxml
creationComplete=initialise() xmlns:local=*
mx:Script
![CDATA[
import mx.collections.ArrayCollection;
import mx.collections.ListCollectionView;
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 = filterDivBy10;
slave3.refresh();
var timer : Timer = new Timer( 10, 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 filterDivBy10( item : Object ) : Boolean
{
var value : int = int(item);
return value % 10 == 0
}
]]
/mx:Script
mx:HBox width=100%
mx:VBox
mx:Label text=Master List/
mx:List editable=true dataProvider={ master } height=400/
/mx:VBox
local:slave slaveData={slave1} label=odd/
local:slave slaveData={slave2} label=even/
local:slave slaveData={slave3} label=divisible by 10/
/mx:HBox
/mx:Application
** slave.mxml **
?xml version=1.0 encoding=utf-8?
mx:VBox xmlns:mx=http://www.adobe.com/2006/mxml
http://www.adobe.com/2006/mxml
xmlns:ac=com.adobe.ac.util.*
creationComplete=complete() initialize=init()
mx:Script
![CDATA[
import mx.collections.ListCollectionView;
[Bindable]
public var slaveData:ListCollectionView;
public function filterDivBy5(item:Object):Boolean {
var value : int = int(item);
if (filterOn.selected)
return value % 5 == 0
else
return true;
}
private function init():void {
trace(init);
debug();
trace();
}
private function complete():void {
trace(complete);
slaveData.filterFunction=filterDivBy5;
debug();
trace();
}
private function filter():void {
trace(filter);
debug();
slaveData.refresh();
trace();
}
private function debug():void {
if (slaveData == null) {
trace(slaveData object is null);
return;
}
trace(length: +slaveData.length);
if (slaveData.filterFunction==null)
trace(filter function: null);
else if (slaveData.filterFunction==filterDivBy5)
trace(filter function: DivBy5);
else
trace(filter function: parent filter);
}
]]
/mx:Script
mx:Label id=slaveLabel text={this.label}/
mx:List dataProvider={slaveData} height=400 editable=true/
mx:CheckBox id=filterOn label=Filter by Div5 change=filter()/
mx:Button click=debug()/
/mx:VBox
On 6/10/06, Paul Williams [EMAIL PROTECTED] mailto:paulw%40adobe.com
wrote:
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
RE: [flexcoders] Re: need strategy for filtering ArrayCollections in a Cairngorm app
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
Re: [flexcoders] Re: need strategy for filtering ArrayCollections in a Cairngorm app
Hi Paul,That's exactly what I was looking for. Thanks for taking the time to supply the sample app! I'm giddy!-TomOn 6/10/06, Paul Williams
[EMAIL PROTECTED] wrote:
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:
flexcoders@yahoogroups.com] 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 viewlisten 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
[flexcoders] Re: need strategy for filtering ArrayCollections in a Cairngorm app
Thanks for your answer Paul. Obviously, I learned as well. :)
-TH
--- In flexcoders@yahoogroups.com, Tom Bray [EMAIL PROTECTED] wrote:
Hi Paul,
That's exactly what I was looking for. Thanks for taking the time
to supply
the sample app! I'm giddy!
-Tom
On 6/10/06, Paul Williams [EMAIL PROTECTED] wrote:
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 flexcoders%40yahoogroups.com
[mailto:
flexcoders@yahoogroups.com flexcoders%40yahoogroups.com] On
Behalf Of
Jeremy Lu
Sent: Saturday, June 10, 2006 4:13 AM
To: flexcoders@yahoogroups.com flexcoders%40yahoogroups.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] TimHoff%40aol.com 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 flexcoders%
40yahoogroups.com, Tom
Bray tombray@ 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 TimHoff@ 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.comflexcoders%40yahoogroups.com, Tom
Bray tombray@ wrote:
The problem is that changes to ModelLocator.getInstance
().masterArray
[flexcoders] Re: need strategy for filtering ArrayCollections in a Cairngorm app
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 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! 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: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [flexcoders] Re: need strategy for filtering ArrayCollections in a Cairngorm app
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 __._,_.___ -- Flexcoders Mailing List FAQ: http://groups.yahoo.com/group/flexcoders/files/flexcodersFAQ.txt Search Archives: http://www.mail-archive.com/flexcoders%40yahoogroups.com SPONSORED LINKS Web site design development Computer software development Software design and development Macromedia flex Software development best practice YAHOO! GROUPS LINKS Visit your group "flexcoders" on the web. To unsubscribe from this group, send an email to:[EMAIL PROTECTED] Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service. __,_._,___
[flexcoders] Re: need strategy for filtering ArrayCollections in a Cairngorm app
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, Tom Bray [EMAIL PROTECTED] 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 [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 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
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[flexcoders] Re: need strategy for filtering ArrayCollections in a Cairngorm app
If that doesn't work you could try this:
mx:Script
![CDATA[
import mx.collections.ArrayCollection;
import org.ets.main.code.model.ModelLocator;
[Bindable]
public var model : ModelLocator = ModelLocator.getInstance();
[Bindable]
public var viewDataProvider : ArrayCollection;
viewDataProvider=new ArrayCollection(model.masterArray);
]]
/mx:Script
-TH
--- In flexcoders@yahoogroups.com, Tim Hoff [EMAIL PROTECTED] 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, 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,
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
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* To visit your group on the web, go to:
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Re: [flexcoders] Re: need strategy for filtering ArrayCollections in a Cairngorm app
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=1Thanks again!-TomOn 6/9/06,
Tim Hoff [EMAIL PROTECTED] 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, Tom Bray [EMAIL PROTECTED] 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 [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 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
__._,_.___
--
Flexcoders Mailing List
FAQ: http://groups.yahoo.com/group/flexcoders/files/flexcodersFAQ.txt
Search Archives: http://www.mail-archive.com/flexcoders%40yahoogroups.com
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Computer software development
Software design and development
Macromedia flex
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Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.
__,_._,___
[flexcoders] Re: need strategy for filtering ArrayCollections in a Cairngorm app
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, Tom Bray [EMAIL PROTECTED] 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 [EMAIL PROTECTED] 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, 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.comflexcoders%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 ~--
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* To visit your group on the web, go to:
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* To unsubscribe from this group, send an email to:
[EMAIL PROTECTED]
* Your use of Yahoo! Groups is subject to:
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Re: [flexcoders] Re: need strategy for filtering ArrayCollections in a Cairngorm app
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.-TomOn 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, Tom Bray [EMAIL PROTECTED] 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 [EMAIL PROTECTED] 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, 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.comflexcoders%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
__._,_.___
--
Flexcoders Mailing List
FAQ: http://groups.yahoo.com/group/flexcoders/files/flexcodersFAQ.txt
Search Archives: http://www.mail-archive.com/flexcoders%40yahoogroups.com
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Web site design development
Computer software development
Software design and development
[flexcoders] Re: need strategy for filtering ArrayCollections in a Cairngorm app
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 viewlisten 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=newArrayCollection({ModelLocator.getInstance().masterArray}); ]]/mx:Script -TH --- In flexcoders@yahoogroups.com flexcoders%40yahoogroups.comflexcoders% 40yahoogroups.com, "TomBray" tombray@ wrote: Thanks, Tim. That makes sense but there's one limitation I'm not surehow to work around. That master Array of users is going to be constantlyupdated by the server to show who's currenlty online. Since an Array isn't bindable, how would you propagate changes from that Array to thefiltered 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.comflexcoders% 40yahoogroups.comflexcoders%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 tothe
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 viewlisten 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=newArrayCollection({ModelLocator.getInstance().masterArray}); ]]/mx:Script
-TH --- In
flexcoders@yahoogroups.com flexcoders%40yahoogroups.comflexcoders%
40yahoogroups.com, TomBray 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 constantlyupdated by the server to show who's currenlty online. Since an Array
isn't bindable, how would you propagate changes from that Array to thefiltered 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.comflexcoders% 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
