I've had pretty good luck using mx.binding.utils.ChangeWatcher to map a
change event in data to a defined function, thereby allowing me to
control the response to the change event.
Jeff
-----Original Message-----
From: [email protected]
[mailto:[EMAIL PROTECTED] On Behalf Of Gareth Edwards
Sent: Sunday, February 18, 2007 4:46 PM
To: [email protected]
Subject: Re: [flexcoders] observing a model change in cairngorm
Typically a binding like the one described will only execute if
the actual property changes, and not its children.
So, if need be, you can do something like this to make sure the
binding executes.
model.someData = new ArrayCollection(mysomeDataArray);
Many ways to do what you might need, just getting the best
solution for you (or maybe best practices?).
But I think Flex and some best practices is a little up in the
air still. So, find something that works for you and go with it I
reckon.
An Observer works nicely to.
Cheers
Gareth.
[EMAIL PROTECTED]
Grant Davies wrote:
Thanks Dimitrios..
Question is when the Model.someData changes, will my set
dataProvider
function be called again ? During my testing it
appeared to be called
when it was first run, but when the model changed the
setProvider
function was never called again...
Grant
...........................................
b l u e t u b e i n t e r a c t i v e.
.: grant davies
.: 404.428.6839 (c)
.: 708-983-1577 (F)
[EMAIL PROTECTED]
http://www.bluetube.com/bti
-----Original Message-----
From: [email protected]
[mailto:[EMAIL PROTECTED] On
Behalf Of Dimitrios Gianninas
Sent: Sunday, February 18, 2007 11:24 AM
To: [email protected]
Subject: RE: [flexcoders] observing a model change in
cairngorm
One way to do it is for the ChartView to manipulate the
data as it
wishes. So have a setter in the ChartView MXML like so:
<bla:ChartView dataProvider="{ModelLocator.someData}"/>
And inside the view it looks like so:
<mx:Box>
<mx:Script>
public function set dataProvider( values:XML ):void {
... do stuff here
}
</mx:Script>
... view stuff here ...
</mx:Box>
Dimitrios Gianninas
Optimal Payments Inc.
-----Original Message-----
From: [email protected] on behalf of Grant
Davies
Sent: Sat 2/17/2007 5:57 PM
To: [email protected]
Subject: RE: [flexcoders] observing a model change in
cairngorm
gareth,
thanks for the response... I think my concern is
poluting the model with
view specific data...
The results of a command is xml and this is set in the
model which is an
as class (VisitorModel) , the chart bound to the model
via its data
provider.
when the app first starts up, I don't have any xml, a
user picks a date
range, I hit a web service and get valid xml back, then
the chart has
to has create a column series based on some labels in
the xml, so I
need to know when the xml has changed so that the column
series can be
created and the chart updated.
In your example below, does the buildJobsTree just
manipulate the data
or does it actually do something to the view ?
Grant
...........................................
b l u e t u b e i n t e r a c t i v e.
.: grant davies
.: 404.428.6839 (c)
.: 708-983-1577 (F)
[EMAIL PROTECTED]
http://www.bluetube.com/bti
<http://www.bluetube.com/bti> <http://www.bluetube.com/bti> A Tribal
Chicken Designs Affiliate
<http://www.tribalchicken.com/> <http://www.tribalchicken.com/>
________________________________
From: [email protected]
[mailto:[EMAIL PROTECTED] On
Behalf Of Gareth Edwards
Sent: Saturday, February 17, 2007 5:43 PM
To: [email protected]
Subject: Re: [flexcoders] observing a model change in
cairngorm
Why not define an as class for your model (if you aren't
already), and
define a separate variable that you can populate on the
other data being
set?
The snippet I posted is from something I've done that
looks like
this....
public function set jobs (data:ArrayCollection
<data:ArrayCollection> <data:ArrayCollection> )
: void
{
_jobs = data;
buildJobsTree(_jobs);
}
Not sure if its the best option.. but it certainly works
for me.
Either that, or there are some observer classes from
Adobe Consulting
that allow you to watch changes to your model from the
UI.
Cheers
Gareth.
Grant Davies wrote:
Thanks gareth..
the model is used by multiple views, a grid and
a chart, the
chart needs the xml from the model manipulated a little
differently than
the grid does...
grant
...........................................
> b l u e t u b e i n t e r a c t i v e.
.: grant davies
.: 404.428.6839 (c)
.: 708-983-1577 (F)
> [EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]>
<mailto:[EMAIL PROTECTED]>
> http://www.bluetube.com/bti
<http://www.bluetube.com/bti> <http://www.bluetube.com/bti>
> A Tribal Chicken Designs Affiliate
<http://www.tribalchicken.com/>
<http://www.tribalchicken.com/>
________________________________
From: [email protected]
<mailto:[email protected]>
<mailto:[email protected]> [mailto:[email protected]
<mailto:[email protected]>
<mailto:[email protected]> ] On Behalf Of Gareth Edwards
Sent: Saturday, February 17, 2007 4:32 PM
To: [email protected]
<mailto:[email protected]>
<mailto:[email protected]>
Subject: Re: [flexcoders] observing a model
change in cairngorm
Why not use a setter in your model and do the
work there?
public function set jobs (data:ArrayCollection
<data:ArrayCollection> <data:ArrayCollection> ) : void
{
// Custom logic here?
_jobs = data;
}
Cheers
Gareth.
Grant Davies wrote:
Hi guys, I've got my view, model,
commands and delegate
all running and my view contains a chart.
When the model changes for my chart data
I need to work
the data a little and can't just directly use the
binding.
do I
1) change my command to fire an event
when the model has
been updated
2) Is there some way I can observe a
model change and
then kick of my "data work" a little and not directly
bind the chart to
the model ?
Grant
...........................................
> b l u e t u b e i n t e r a c t i v e.
.: grant davies
.: 404.428.6839 (c)
.: 708-983-1577 (F)
> [EMAIL PROTECTED]
<mailto:[EMAIL PROTECTED]> <mailto:[EMAIL PROTECTED]>
> http://www.bluetube.com/bti
<http://www.bluetube.com/bti>
<http://www.bluetube.com/bti>
> A Tribal Chicken Designs Affiliate
<http://www.tribalchicken.com/>
<http://www.tribalchicken.com/>
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