I've just written my first blog entry around this area. I plan to extend
around this in the coming days and weeks. There are comments enabled, so
feel free to let me know what you think.
http://weblogs.macromedia.com/auhlmann/archives/2006/06/cairngorm_sampl.
cfm
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
-----Original Message-----
From: flexcoders@yahoogroups.com [mailto:[EMAIL PROTECTED] On
Behalf Of Darren Houle
Sent: 01 June 2006 20:29
To: flexcoders@yahoogroups.com
Subject: RE: [flexcoders] Re: Dispatching multiple events in order with
cairngorm
Tim,
That's the one part of Cairngorm (for me) that's the tricksiest... how
one might handle (as someone else recently put it) the sexy features of
Flex in Cg. Transitions, states, effects, animations that may need to
be syncronized with something else. Of course, you don't want to put
too much control in the Cg framework since that might restrict you in
some other way (I definitely agree that Cg needs to be lightweight as
Steven's articles point out.) The ChangeWatcher is, however, very cool
in that it allows you to watch not only one bound state value, but
chains of them... so if you needed to trigger an event only after, say,
four other events completed you could have those four events set flags
in the ModelLocator on effectEnd and have your ChangeWatcher bound to
all four flags, only calling it's handler after all four were completed.
I think that the ChangeWatcher is a great addition to B3, and actually
offers the same benefits, with more functionality, than Paul's helper
class. As far as Cg goes, maybe we just need a Cg example out there
that uses ChangeWatcher (or something like it) that shows a chain of
events triggering a final command... take some of the mystery out of it.
Darren
>From: "Tim Hoff" <[EMAIL PROTECTED]>
>Reply-To: flexcoders@yahoogroups.com
>To: flexcoders@yahoogroups.com
>Subject: [flexcoders] Re: Dispatching multiple events in order with
>cairngorm
>Date: Thu, 01 Jun 2006 16:42:55 -0000
>
>I absolutely agree that a Command should never invoke anything view
>related, except for setting bound model values that update views
>automatically. For Jean-Luc's scenario, my thinking is that there may
>be several different views that require closure before the primary
>command is executed. To close any or all of the possible open views in
>a clean and synchronous manner, I would think that you could combine
>the SequenceCommand (is it ChainCommand now?) with the ChangeWatcher
>utility or a simple eventListener. The executeNextCommand function
>would be invoked only after the SequenceCommand receives notification
>of the effectEnd event. The question is, should you use the
>ChangeWatcher to listen for a model variable change, that would have to
>be updated by the view or a
>helper? Or, would an explicit eventListener for the views'
>effectEnd event be more suitable?
>
>This is a gray area in Cairngorm for me. It seems that there may be
>times when a complete round-trip of event communication, starting and
>ending at a view, may come in handy and/or be necessary. Well, maybe
>not necessary but certainly more convenient. For me, this fits in the
>same category as deciding whether to perform a simple view action with
>a ViewHelper/ViewLocator or with yet another
>Event/Control/Command/Model structure. I'm not sure if discussing
>theoretical framework implementation is germane to this list, but I'd
>be interested to hear further thoughts (best practices) concerning this
>topic. Thanks for your ideas Steven, Alex and Darren.
>
>Tim Hoff
>
>
>--- In flexcoders@yahoogroups.com, "Jean-Luc ESSER" <[EMAIL PROTECTED]> wrote:
> >
> > I do agree with you guys, that's the way to go !
> > Thanx !
> >
> > BTW, loved Paul's little helper.
> > This one is a sure hit !
> >
> > -JL
> >
> > ----- Original Message -----
> > From: "Darren Houle" <[EMAIL PROTECTED]>
> > To: <flexcoders@yahoogroups.com>
> > Sent: Thursday, June 01, 2006 4:49 PM
> > Subject: RE: [flexcoders] Re: Dispatching multiple events in order
>with
> > cairngorm
> >
> >
> > >I agree with Alex. Say you have a View with a button... you
>mutate that
> > > button's click="" event into a CairngormEvent. Your custom Cg
>Event
> > > triggers a Cg Command, which sets state in the ModelLocator.
>New to Beta
> > > 3
> > > is a utility called ChangeWatcher that allows you to watch a
>bindable
> > > value
> > > and define a handler to run when the value changes. In the
>original View
> > > (or any other View) you could simply watch that state var and
>have
> > > ChangeWatcher call yourMoveEffect.play(). You could mutate the
>standard
> > > effectEnd="" event into a new CairngormEvent that triggered the
>Cg Command
> > > that needs to run at the end of the effect.
> > >
> > > Darren
> > >
> > >
> > >
> > >>From: "Alex Uhlmann" <[EMAIL PROTECTED]>
> > >>Reply-To: flexcoders@yahoogroups.com
> > >>To: <flexcoders@yahoogroups.com>
> > >>Subject: RE: [flexcoders] Re: Dispatching multiple events in
>order with
> > >>cairngorm
> > >>Date: Thu, 1 Jun 2006 06:46:57 -0700
> > >>
> > >>Hi Guys,
> > >>
> > >>
> > >>I'd probably suggest letting the view dispatch a Cairngorm
>event, having
> > >>that following Command change a state in your model and have
>that view
> > >>bind to that state change in the model. This view will trigger
>the
> > >>effect and at effectEnd you will trigger another Command. IMHO,
>the
> > >>Command should never invoke anything view related (like an
>effect) by
> > >>himself.
> > >>
> > >>Note that your view (MXML) can bind to the model using the
>mx:Binding
> > >>tag. BTW: check out Paul's little helper for that. ;)
> >
> >>http://weblogs.macromedia.com/paulw/archives/2006/05/the_worlds_sma
>l.cfm
> > >>#more
> > >>
> > >>
> > >>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]
> > >>
> > >>
> > >>-----Original Message-----
> > >>From: flexcoders@yahoogroups.com
>[mailto:[EMAIL PROTECTED] On
> > >>Behalf Of Jean-Luc ESSER
> > >>Sent: 01 June 2006 10:35
> > >>To: flexcoders@yahoogroups.com
> > >>Subject: Re: [flexcoders] Re: Dispatching multiple events in
>order with
> > >>cairngorm
> > >>
> > >>Thanx Tim i'm gonna look into this, but i'm worried about one
>issue :
> > >>In case of a command launching an effect in a component, when
>the effect
> > >>starts, it means the command has executed, thus invocating the
>next
> > >>command.
> > >>What if i want to wait for effectEnd before invoking next
>command...
> > >>
> > >>I'll keep you posted.
> > >>
> > >>-JL, investigating.
> > >>
> > >>----- Original Message -----
> > >>From: "Tim Hoff" <[EMAIL PROTECTED]>
> > >>To: <flexcoders@yahoogroups.com>
> > >>Sent: Thursday, June 01, 2006 11:18 AM
> > >>Subject: [flexcoders] Re: Dispatching multiple events in order
>with
> > >>cairngorm
> > >>
> > >>
> > >> > Hi Jean-Luc,
> > >> >
> > >> > It looks like you might need to use the Cairngorm
>SequenceCommand
> > >> > class. I haven't used this yet but if you look at the source
>for the
> > >> > SequenceCommand class, it describes a possible solution for
>you. If
> > >> > you use this and get it to work, please post your findings
>here.
> > >> >
> > >> > Good Luck,
> > >> > Tim
> > >> >
> > >> >
> > >> > --- In flexcoders@yahoogroups.com, "JL E." <flex@> wrote:
> > >> >>
> > >> >> Hi there !
> > >> >>
> > >> >> I have a search pane. I open it (sliding to the right).
> > >> >> Now, i want to go somewhere else in the application.
> > >> >> In order to do that, when clicking on let's say 'contact', i
> > >> > dispatch an event which is gonna show page contact.
> > >> >> The thing is that when clicking 'contact', before executing
>the
> > >> > command which is gonna build contact page, i want to check if
>the
> > >> > search pane is open, and if so, i want to dispatch event
> > >> > closeSearchPane, wait until it is fully closed, and only then
>execute
> > >> > my command showContactPage.
> > >> >> I guess coding this logic in my command showContactPage won't
> > >> > scale as i may need this logic to work everywhere in the app,
> > >> > whichever event i am gonna dispatch.
> > >> >> How would you do it ? What am i missing here ?
> > >> >>
> > >> >> Best,
> > >> >> Jean-Luc
> > >> >>
> > >> >> PS: Thanx Alex for previous answers regarding getters
>setters !
> > >> > Worked fine !
> > >> >>
> > >> >
> > >> >
> > >> >
> > >> >
> > >> >
> > >> >
> > >> >
> > >> > --
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> > >>
> > >>
> > >>
> > >>
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