On 12/27/06, Tracy Spratt <[EMAIL PROTECTED]> wrote:
Hank, you are absolutely correct, the amazing e4x selection expressions will replace the recursive function. I guess I did so many recursive functions for this in 1.5 that I was temporarily stupid. And the ID values can be stored in a simple Array, and looped over. I believe he will still need to climb the ancestor chain to open the parents of the found nodes though. Tracy ------------------------------ *From:* flexcoders@yahoogroups.com [mailto:[EMAIL PROTECTED] *On Behalf Of *hank williams *Sent:* Wednesday, December 27, 2006 9:26 AM *To:* flexcoders@yahoogroups.com *Subject:* Re: [flexcoders] Tree: Resetting openItems after dataProvider change Actually, Tracy, I dont think you need to do all of this work. The openItems field of the tree does it for you. So you just need to go through the openItems array of nodes and gather all the item IDs that I described in the prior email. To reopen them later, you just use the an e4x function (I forget the syntax but I can look if necessary) to find all the items in the dataprovider that have the given ID. You then open each one of these nodes. Hank On 12/26/06, *Tracy Spratt* <[EMAIL PROTECTED]> 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:* flexcoders@yahoogroups.com [mailto:[EMAIL PROTECTED] *On Behalf Of *hank williams *Sent:* Sunday, December 24, 2006 7:51 AM *To:* flexcoders@yahoogroups.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* <[EMAIL PROTECTED]> 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/) 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 Search Archives: http://www.mail-archive.com/flexcoders%40yahoogroups.com Yahoo! Groups Links
