I think one of the only main benefits (some may see it as code bloat) is encapsulation and binding. if you pass the vaiables through to the child, your child components don't reference the parent's model directly, they have their own model. plus binding works more consistently when the model you are binding to is in the same scope.
--- In [email protected], "Mehdi, Agha" <[EMAIL PROTECTED]> wrote: > Well, I guess you're right. Just passing a pointer doesn't affect the > performance but I'd still think twice before passing reference of a parent > to its immediate child when the child already has its reference. May be, I'm > missing some big picture or the reasons why would you want to do it. Any > thoughts or ideas will be appreciated. > > Thanks > > -----Original Message----- > From: Tracy Spratt [mailto:[EMAIL PROTECTED] > Sent: Friday, March 18, 2005 4:43 PM > To: [email protected] > Subject: RE: [flexcoders] ViewStack beheviour > > > How you reference something depends on how you want to use it. > > If you are programmatically getting data or executing methods or setting > properties, reaching up through the component chain is fine, even using > mx.core.Application.application. > > But beware if you are binding. For binding to work correctly, you need a > declared, TYPED variable or property in the component itself. > > Text="{mx.core.Application.application.myArray}" will not work reliably > > If you are binding, pass a reference to the parent into the child component, > being sure to declare the type for the property. If you pass in a reference > to the Application, the type should be the application name. > > By the way, I do not believe passing references is going to have any > performance impact. Before I learned how to pass a reference to the > application, I was routinely passing 30+ references into components. > Changing that has not resulted in any noticeable performance increase. > You are just passing a "pointer" after all. > > Tracy > > -----Original Message----- > From: Mehdi, Agha [mailto:[EMAIL PROTECTED] > Sent: Friday, March 18, 2005 3:34 PM > To: '[email protected]' > Subject: RE: [flexcoders] ViewStack beheviour > > > There's a property called "parent" of mx.core.UIObject. All the > containers, > controls etc extend this Object. This property represents the parent > container of the current control. For eg > > <mx:ViewStack id="myVS"> > <test:child1/> > <test:child2/> > </mx:ViewStack> > > In both of these children, you can get to the stack by: > > parentStack = this.parent; > > > > -----Original Message----- > From: Krzysztof Szlapinski [mailto:[EMAIL PROTECTED] > Sent: Friday, March 18, 2005 11:32 AM > To: [email protected] > Subject: Re: [flexcoders] ViewStack beheviour > > > > > Couldn't you just get to the parent, which is the ViewStack, of those > > children from within those children instead of passing the parent into > > > each of them? > > what do you mean by this? > i did it the way the docs says it shoul be done. at least I think so:) > if > there is a better solution I would be pleased to learn it. > > one thing to add - these components use some external actionscript > functions > which operates on the "vs" object > > krzysiek > > > > > -----Original Message----- > > From: Krzysztof Szlapinski [mailto:[EMAIL PROTECTED] > > Sent: Friday, March 18, 2005 10:01 AM > > To: [email protected] > > Subject: Re: [flexcoders] ViewStack beheviour > > > > > > > > Yeah, these components have functions that handle this "vs" and its > > children. > > btw > > creationPolicy set to "all" made the problem go away but unfortunately > > > all the controls which were invisible became visible :( is it normal > > behaviour that creationPolicy = "all" makes all controls visible even > > if they have visible property set to "false"? > > > > krzysiek > > > > > >> > >> One more thing that I noticed is that you're passing "vs" to every > >> child of the stack? That might also be the cause. Any reason behind > >> that? > >> > >> -----Original Message----- > >> From: Steven Webster [mailto:[EMAIL PROTECTED] > >> Sent: Friday, March 18, 2005 8:24 AM > >> To: [email protected] > >> Subject: RE: [flexcoders] ViewStack beheviour > >> > >> > >> > >>> > >>> The nextButton navigates to the next viewstack element. My problem > >>> is that each component is displayed very slowly. > >>> It takes about 5 sec. to generate about 20 objects in each > component. > >>> > >>> How can I reduce this time? > >>> > >> > >> Do a search for creationPolicy in the livedocs; you should be able to > > >> defer or queue the instantiation of your non-visible views in the > >> ViewStack, and spread the performance hit over time. > >> > >> Steven > >> > >> -- > >> Steven Webster > >> Technical Director > >> iteration::two > >> > >> This e-mail and any associated attachments transmitted with it may > >> contain confidential information and must not be copied, or > >> disclosed, or used by anyone other than the intended recipient (s). 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