----- Original Message -----
From: "Kevin Merritt" <[EMAIL PROTECTED]>
To: <flexcoders@yahoogroups.com>
Sent: Monday, January 01, 2007 7:27 PM
Subject: [flexcoders] ViewStates vs ViewStacks in App Control
> I am trying to build out a basic framework for my application and I
> have about 4 different "screens" that users can view depending on
> what they are trying to do in the applications:
>
> Welcome Graphics & Login Screen
> Overview Screen
> Detailed View Screen
> Generate Reports Screen
>
> These screens don't share similar menus or components so I am
> thinking it is best to create a view stack for navigating between the
> different screens ->
>
> Application
> ViewStack
> Welcome Graphics & Login Screen
> Overview Screen
> Detailed View Screen
> Generate Reports Screen
Perhaps:
Application default state
Welcome Graphics & Login Screen
Application logged on state
ViewStack
Overview Screen
Detailed View Screen
Generate Reports Screen
Apart from the obvious logon situation I think states can work really well
within components.
> Here are my questions:
> 1) If I do this, can I add a loader to each child of the ViewStack so
> that the user does not have to wait for the entire app to load in
> order to start the application?
This already happens with components instantiated on demand as you run
through the view stack.
> 2) I could also do this using ViewStates, but it seems to me that
> ViewStates are more useful when there are significant shared assets &
> components between the different states. However, performance-wise
> would it be better to use one over the other?
I would split the different 'screens' into separate flex components and add
them into the viewstack. Having them as separate components makes the app
much more modular - my designs are components nested within components like
building bricks. Use events to communicate between components (or more
properly your MVC architecture).
> 3) In the long run (should my application grow larger) would it be
> better to use a modular approach and load modules for each view?
See how it goes - build as much as you need - when/if it gets slow, look
again at re-architecting the application using components you have built.
Don't make things more complicated than it needs to be.
> However because I am using Cairngorm would this add an extra layer of
> difficulty trying to maintain/share a ModelLocator, FrontController,
> etc between a number of different modules?
Don't really see how Cairngorm would affect this. If you build in
complication it will be complicated with or without Cairngorm.
Paul
>
> Thanks for your advice. It always seems the design decisions are
> much more confusing than the actual coding!!
>
> - Kevin
>
>
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