Re: [flexcoders] View Loads / Service Results / Presentation Question

[Igor Costa]

www.carnigondocs.orgRegards.On 11/3/06, Jamie O <[EMAIL PROTECTED]
> wrote:












  


    
            Hey,

I'm getting pretty comfortable using Cairngorm, but known that I'm
still only scratching the surface of Flex 2. But I've run into two
separate issues that I think are really the same. I think the common
question I'm asking is how do you prevent updates from displaying to
the screen until all results / data are loaded?

Scenario #1:
-In the creationComplete event of my main .mxml file I call a function
which broadcasts an event - evalURLEvent.

-Depending on a number of data variables, the command will direct the
user to a given view by updating a specific variable in the model -
appState - which my viewStack has as it's data provider.

-In most cases of that evalURLEvent command, I do a number of service
calls and only change the appState in the appropriate onResult function.

-The problem is that because the event is a separate process, the app
appears to load and then drops in data / presentation which looks
fugly. I've hunted a bit on preloaders, but can't seem to find a
sufficient example to display the preloader in all cases and remove it
within my result function (once I know the data is back).

Scenario #2:
-I have a single event type - NavigateEvent - which I broadcast in a
number of view event handlers when I want to change the view (by
changing the appState variable in the command.

-When my user attempts to login, I broadcast this event along with the
user / pass for validation (currently stubbed for a service call).

-When the login returns valid, I want to send the user to an inbox
screen where they will get a list of messages.

-The same issue comes up as the initial load. On receipt of the
validation of the login call, I would send out requests for their
message data, contacts, etc. I only want to upload the view to the
inbox once I have all that data.

I'm using the busy cursor on the service calls for now, but I'm
certain there must be better logic to consider for these types of
issues. If someone can point me down the path to enlightenment, it
would greatly be appreciated.

Thx,
Jamie

P.S. I think this is a general enough issue, and the code would have
to come from such a variety of spots in my app, that I didn't think
including my sample code would help. If you can provide a response I'm
pretty confident I can 'cairngormalize' it to my needs.


      

    
    










-- ----------------------------Igor Costawww.igorcosta.com

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