... no more than selectedIndex is now;) My final solution to this was to force the tree to always have its branches open (it's small enough that this isn't too ugly). Then I use selectedIndex to reselect the last node the user selected before the language change. I know it's kludgey. On with the show...
--- In [email protected], "hank williams" <[EMAIL PROTECTED]> wrote: > > openIndices, huh? Isn't there a problem wherein "index" is linear, but the > > tree is hierarchical? > > > > Yes, it would be a rather fragile value. > > > Hank. > > ------------------------------ > > > > *From:* [email protected] [mailto:[EMAIL PROTECTED] *On > > Behalf Of *Oliver Merk > > *Sent:* Wednesday, January 03, 2007 9:35 PM > > *To:* [email protected] > > *Subject:* [flexcoders] Re: Tree: Resetting openItems after dataProvider > > change > > > > > > > > @Tracy & Hank: Thanks very much for the feedback and suggestions. > > Tracy, I clearly understand that the data drives the behavior of the > > tree. I do, however, disagree with Adobe's changes to the tree control > > in Flex 2. > > > > Here's why: The concept of a node being opened or closed, has no > > corollary in the ArrayCollection or XMLListCollection data structures. > > That is, an ArrayCollection element has no concept of being "open". > > This is a concept related to the Tree control. So the act of restoring > > the open/closed state of a tree's nodes should IMHO be a lot easier > > than jumping through the hoops we've all suggested. > > > > If, as I originally suggested, there was a openIndices property, > > similar in concept to the openItems property which already exists, I'd > > be able to restore the tree's visual appearance *independent* of the > > data -- which, in my case of switching languages at runtime is exactly > > what I need to do. > > > > I have achieved a working prototype by adding an attribute to the > > branch nodes' XML, tracking the open and close events and recursing > > through the data to restore the opened states after the data has > > changed; but again, IMHO it should not be this hard;) > > > > Thanks again, > > Oliver > > > > --- In [email protected] <flexcoders%40yahoogroups.com>, "Tracy > > Spratt" <tspratt@> wrote: > > > > > > Yes, Hank's solutionsis what I would do. > > > > > > > > > > > > Further, when you say "...Flex 2 tree control limits direct access to > > > nodes...", you make me suspect you are making a conceptual mistake. > > > With data-driven controls, you never directly access the controls > > > themselves. Rather, you work with the dataProvider, to which you have > > > full access. > > > > > > > > > > > > So in your case, you would have the unique id on each element(XML > > > object/node) in your XMLListCollection, and you would store the open > > > nodes in some list. I think an associative array(hash table) would be > > > the most efficient. The function to open those nodes would need to be > > > recursive. When your recursive function matches a node in the > > > associative array, you would need to climb back up the tree, parent by > > > parent, opening each node as you go, till you reach an alrady open node. > > > Might be a bit more compilcated than that, since you want to reach the > > > end of a recursion branch before you stop searching. > > > > > > > > > > > > If you post an example of two sample matching xml docs, with the above > > > mentioned ids, I might try to implement this functionality as an > > > example. > > > > > > > > > > > > Tracy > > > > > > > > > > > > > > > > > > ________________________________ > > > > > > From: [email protected] <flexcoders%40yahoogroups.com> [mailto: > > [email protected] <flexcoders%40yahoogroups.com>] On > > > Behalf Of hank williams > > > Sent: Sunday, December 24, 2006 7:51 AM > > > To: [email protected] <flexcoders%40yahoogroups.com> > > > Subject: Re: [flexcoders] Tree: Resetting openItems after dataProvider > > > change > > > > > > > > > > > > I think you are on track with the idea of needing an "open indices" > > > property. But indicices are a bit messy in a tree. what would be best is > > > a set of common unique identifiers. A field in each node that is unique. > > > This will allow you to build a function that creates a list of the ids > > > that are open, and another function that opens those nodes. The nodes > > > will have the same id no matter what language the actual text of the > > > tree item is. gathering the ids from the open items, and opening the > > > items that have a given list of ids should be relatively straight > > > forward. > > > > > > Regards, > > > Hank > > > > > > On 12/23/06, Oliver Merk <oliverm1@ <mailto:oliverm1@> > > > > wrote: > > > > > > I've been wrestling with this for over a week and haven't found a > > > solution to this problem. Hoping someone can help. > > > > > > I have a tree control that, at runtime, changes its dataProvider. In > > > this case, I'm switching languages and the dataProvider format is > > > XMLListCollection. I'd like to restore the open items of the tree > > > after the dataProvider has changed. I tried using the openItems > > > property, but openItems stores a list of XML objects from the original > > > dataProvider. > > > > > > When the provider changes, the XML objects are of course different, > > > and trying to reset the openItems property fails. What I really need > > > is an "openIndices" property that is not tied to the XML data in the > > > provider. > > > > > > The example Adobe gives > > > (http://www.adobe.com/devnet/flex/quickstart/working_with_tree/ > > > <http://www.adobe.com/devnet/flex/quickstart/working_with_tree/> ) is > > > not helpful since they switch between two dataProviders with the same > > > content and they're using an ArrayCollection (I'm using an > > > XMLListCollection). > > > > > > I've tried walking the tree but since the new Flex 2 tree control > > > limits direct access to nodes, I could not find a way to detect the > > > open indexes of the tree directly. > > > > > > Any ideas? > > > > > > Thanks, > > > Oliver > > > > > > > > > > > > -- > > > Flexcoders Mailing List > > > FAQ: http://groups.yahoo.com/group/flexcoders/files/flexcodersFAQ.txt > > > <http://groups.yahoo.com/group/flexcoders/files/flexcodersFAQ.txt> > > > Search Archives: > > > http://www.mail-archive.com/flexcoders%40yahoogroups.com > > > <http://www.mail-archive.com/flexcoders%40yahoogroups.com> > > > Yahoo! Groups Links > > > > > > > > > (Yahoo! ID required) > > > > > > mailto:[EMAIL PROTECTED]<flexcoders-fullfeatured%40yahoogroups.com> > > > <mailto:[EMAIL PROTECTED]<flexcoders-fullfeatured%40yahoogroups.com> > > > > > > > > > > > > >
