This could be handled in a more elegant fashion, if you used a presentation model and injection. But, a simple way to solve this is to create a selectedRooms ArrayCollection in the model. This collection would hold references to the roomVO's that are in the rooms collection; that is bound to the DataGrid. When the user selects a room, dispatch an event that contains the selectedItem (RoomVO). In the command, add the selectedItem to the selectedRooms collection. In the view that contains the TabNavigator, add an event listener for the CollectionEvent.COLLECTION_CHANGE event; on the selectedRooms collection in the model. In the eventHandler function for the collection change event, manually update the TabNavigator; based on the items in the selectedRooms collection. If you look at the CollectionEventKind of the CollectionEvent, you can branch for add or remove. For each RoomVO in the selectedRooms collection, you can loop through the children of the TabNavigator; to determine if the room component exists already (compare to the component's roomVO). If not, create an instance of the room component , set the component's roomVO, and add the component, as a child, to the TabNavigator. If you're allowing removes as well, you'll have to loop through the TabNavigator children first and see if they exist in the selectedRooms collection. Except for the first child, if a component's roomVO doesn't exist in the collection, remove the child component from the TabNavigator.
Another alternative would be to make a component out of the TabNavigator's parent. Use binding to the selectedRooms model collection on the component's tag, and use a public getter/setter for the dataProvider collection in the component. In the setter, mark a dataProviderChanged Boolean to true and invalidateProperties. In commitProperties, add or remove the room components to/from the TabNavigator, and invalidateDisplayList. This eliminates the collection change event listener, but is a bit more complicated. Good luck! -TH --- In [email protected], "Paul Andrews" <p...@...> wrote: > > ----- Original Message ----- > From: "someguy7_7" mus...@... > To: [email protected] > Sent: Sunday, January 04, 2009 8:23 PM > Subject: [flexcoders] Re: Cairngorm proper usage > > > > Can you give me some ideas on how I should setup the model? Have a > > property called tabs that just has a list of view components that I > > bind to the tabnavigator? Come to think of it I am not sure where I > > would bind that to the tabnavigator. > > On reflection, your tabnavigator is doing two things - the first tab is > displaying all the rooms, then you have additional tabs that show opened > rooms. > > Essentially, your tab navigator is driven by the content of the room list > shown in the first tab. You can't bind a tabnavigator directly to the model > automatically, since you need to create containers to represent each opened > room and add them to the tab navigator and presumably remove them when the > room is closed. Essentially, you need to listen for changes in the room > model. You should be able to drive this from the same part of the model you > are binding your datagrid from on the first tab. > > Your view is going to need a method (function) to respond to changes in the > room data (specifically the field that says whether a room is open or > closed) and I thing the view can do this using BindingUtils and the > bindSetter() method to invoke a function to manipulate that Tabnavigator > child containers according to changes in the model. > > It is going to require some work. > > Paul > > > > > Thanks > > > > --- In [email protected], "Paul Andrews" paul@ wrote: > >> > >> > >> ----- Original Message ----- > >> From: "someguy7_7" muswei@ > >> To: [email protected] > >> Sent: Sunday, January 04, 2009 6:23 PM > >> Subject: [flexcoders] Re: Cairngorm proper usage > >> > >> > >> > But how would I setup the binding in the tabnavigator so that the > >> > first tab the list of rooms never goes away? I can't just set it to a > >> > arraycollection of the rooms in the model since that will wipe out my > >> > room list that I always want to be there. The only solution I can > >> > think of is to implement a viewcontroller that listens for a an event > >> > that is fired from the command that the model has been updated with > >> > the new room which then tells the view to run through the room list > >> > and add any rooms that don't already exist. This seems like a lot of > >> > extra work. Anyone have a cleaner method? > >> > >> Your view should always reflect the model. If the view should always > > display > >> a room list make sure the model always has the list in place. Your > > problem > >> is a problem of maintaining an appropriate model, not an appropriate > > view. > >> > >> Paul > >> > >> > Thanks > >> > > >> > --- In [email protected], "Ralf Bokelberg" > >> > <ralf.bokelberg@> wrote: > >> >> > >> >> It would be in the spirit of Cairngorm to fire off a EnterRoom event, > >> >> which triggers a EnterRoom command. The command calls a enterRoom > >> >> method in some model. The TabNavigator binds to this model and > >> >> updates itself, whenever the model changes > >> >> > >> >> With kind regards, > >> >> Ralf. > >> >> > >> >> On Sun, Jan 4, 2009 at 7:49 AM, someguy7_7 <muswei@> wrote: > >> >> > I am trying to determine the best way to use cairngorm for the > >> >> > following use case. I want to display a tabnavigator that only > > has 1 > >> >> > child which is a component that has a list of rooms in a datagrid. > >> >> > When one of the rooms is clicked a instance of the room > > component is > >> >> > added to the tabnavigator as a child. The room component just has a > >> >> > label that says "You are in room xxxxxx". Can I just fire off a > >> >> > regular event from the room list component that the main view is > >> >> > listening for so it can add the new child to the tabnav or do I > > need > >> >> > to fire off a cairngorm event that goes through a command which > >> >> > somehow gets back to the view and tells it to add a new child > > to the > >> >> > tabnav? > >> >> > > >> >> > Any ideas on the best way to set this up so it does not violate the > >> >> > spirit/laws of cairngorm? > >> >> > > >> >> > Thanks > >> >> > > >> >> > > >> >> > >> > > >> > > >> > > >> > ------------------------------------ > >> > > >> > -- > >> > Flexcoders Mailing List > >> > FAQ: http://groups.yahoo.com/group/flexcoders/files/flexcodersFAQ.txt > >> > Alternative FAQ location: > >> > > > https://share.acrobat.com/adc/document.do?docid=942dbdc8-e469-446f-b4cf-\ 1e62079f6847 > >> > Search Archives: > >> > http://www.mail-archive.com/flexcoders%40yahoogroups.comYahoo! Groups > >> > Links > >> > > >> > > >> > > >> > > > > > > > > ------------------------------------ > > > > -- > > Flexcoders Mailing List > > FAQ: http://groups.yahoo.com/group/flexcoders/files/flexcodersFAQ.txt > > Alternative FAQ location: > > https://share.acrobat.com/adc/document.do?docid=942dbdc8-e469-446f-b4cf-\ 1e62079f6847 > > Search Archives: > > http://www.mail-archive.com/flexcoders%40yahoogroups.comYahoo! Groups > > Links > > > > > > >
