Thanks Tracy, I'll try that. I'll take some time @ startup to build the dictionary, but doing it once is of course better than doing it x times every minute :).
On Fri, Jan 1, 2010 at 6:53 PM, Tracy Spratt <[email protected]> wrote: > > > One thing I have considered trying is to put a reference to every node > into an associative array Object), based on a string key. That would > essentially give you random access to any node at hash table speeds. Or > maybe use a Dictionary, with the node as the key. > > > > I have not actually tried this. > > > > Tracy Spratt, > > Lariat Services, development services available > ------------------------------ > > *From:* [email protected] [mailto:[email protected]] *On > Behalf Of *Jeroen Beckers > *Sent:* Thursday, December 31, 2009 8:34 AM > *To:* [email protected] > *Subject:* [SPAM] Re: [flexcoders] Selecting xml nodes in a tree > > > > > > I fine-tuned it to the following (some lines are commented, just to give a > complete example for future google-visitors) > > private function displayTreeNode(node:XML):void > { > var t:Number = getTimer(); > //expand all the parents > expandToTop(node.parent()); > //item is now selectable > tree.selectedItem = node; > //open the item itself > //tree.expandItem(node,true,false); > > > //make the node visible (=position scrollbar) > var idx:int = tree.getItemIndex(node); > tree.scrollToIndex(idx); > //tree.firstVisibleItem = node; > > trace("Looking up the item in the tree took " + (getTimer() - > t) + "ms"); > } > > private function expandToTop(node:XML):void > { > //open if it's not open yet > //if(!tree.isItemOpen(node)) tree.expandItem(node, true); > tree.expandItem(node, true); > > //if there's a parent, continue recursion > if(node.parent()) expandToTop(node.parent()); > } > > The only problem now is that my treeData is really big and the E4X > statement takes about 1200ms on average. Updating the tree takes up another > 800ms. I'll have to optimize the crap out of this :). > > > On Wed, Dec 30, 2009 at 5:21 PM, Jim Hayes <[email protected]> > wrote: > > > > It strikes me now that if it meets an open node on the way up the tree it > will stop there (and probably shouldn't) > You might want to allow for that / fix it. > It's something that I put in as a feature request that was subsequently > depreciated because when the client saw it in practice they decided they > didn't like it after all! > So it's not all that well tested I'm afraid. > > > > -----Original Message----- > From: [email protected] <flexcoders%40yahoogroups.com> on behalf > of Jeroen Beckers > Sent: Wed 12/30/2009 3:20 PM > To: [email protected] <flexcoders%40yahoogroups.com> > > Subject: Re: [flexcoders] Selecting xml nodes in a tree > > Hi Jim, > > I think that'll be enough to get me going, thanks! :). > > And if not, you'll hear from me soon enough :). > > Greets, > Dauntless > On Wed, Dec 30, 2009 at 3:36 PM, Jim Hayes > <[email protected]<jim%40primalpictures.com>> > wrote: > > > > > > > I've used something like this (which is possibly a bit flaky, I admit. I > > wrote this a long time ago and haven't revisited it since). > > > > private function displayTreeNode(node:XML):void > > { > > expandTreeParents(node); > > movieTree.selectedItem = node; > > movieTree.expandItem(node,true,false); > > var idx:int = movieTree.getItemIndex(node); > > movieTree.scrollToIndex(idx); > > movieTree.firstVisibleItem = node; > > } > > > > private function expandTreeParents(node:XML):void { > > if (node && !movieTree.isItemOpen(node)) { > > movieTree.expandItem(node, true); > > expandTreeParents(node.parent()); > > } > > } > > > > where movieTree is my tree instance. > > You need to traverse up the tree from the node you want to display and > open > > each item ( expandTreeParents() above ), > > then select the node you want to display. This may not be visible even > > then, hence the scroll to index stuff. > > > > Hope that's enough to get you going, in any case. > > > > > > -----Original Message----- > > > From: [email protected] <flexcoders%40yahoogroups.com><flexcoders% > 40yahoogroups.com> on behalf > > of thedauntless_ff > > Sent: Wed 12/30/2009 1:31 PM > > > To: [email protected] <flexcoders%40yahoogroups.com><flexcoders% > 40yahoogroups.com> > > Subject: [flexcoders] Selecting xml nodes in a tree > > > > Hi, > > > > My situation: > > - 1 Tree component (id=tree) > > - 1 XMLListCollection as a dataprovider for the tree (id=treeData) > > - 1 String, a url, that has to be found & selected. > > > > My XMLListCollection looks like this: > > <page title="page1" href="url1"> > > <page title="subpage1" href="url2"/> > > <page title="subpage2" href="url3"> > > <page title="subsubpage1" href="url4"> > > </page> > > </page> > > <page title="page2" href="url5"> > > <page .../> > > <page .../> > > </page> > > > > Etc. All nodes are named 'page' and have a href property. > > > > What I need now, is a way to select the node in the tree for the given > url. > > For example, all nodes are collapsed and I want to select the node with > > href=url4. How can I do this? > > > > This is what I tried: > > > > var t:XMLListCollection = this.treeData; > > var url:String = "myURL"; > > for(var i:Number = 0; i<t.length; i++) > > { > > //this works, nodes now contains a list of xml items with the correct > url. > > var nodes:XMLList = t[i]..page.(@href==url); > > if(nodes.length() > 0) > > { > > //I only want to select the first occurence > > tree.selectedItem = nodes[0]; > > break; > > } > > } > > > > This, however, gives me a weird error (probably not that helpfull): > > > > TypeError: Error #1010: A term is undefined and has no properties. > > at > > > mx.controls.listClasses::ListBase/setSelectionDataLoop()[E:\dev\beta1\frameworks\projects\framework\src\mx\controls\listClasses\ListBase.as:7360] > > at > > > mx.controls.listClasses::ListBase/commitSelectedItems()[E:\dev\beta1\frameworks\projects\framework\src\mx\controls\listClasses\ListBase.as:7251] > > at > > > mx.controls.listClasses::ListBase/commitSelectedItem()[E:\dev\beta1\frameworks\projects\framework\src\mx\controls\listClasses\ListBase.as:7216] > > at mx.controls.listClasses::ListBase/set > > > selectedItem()[E:\dev\beta1\frameworks\projects\framework\src\mx\controls\listClasses\ListBase.as:3474] > > at classes::Logic/onBrowserLocationChange()[C:\Users\ser\Documents\Flex > > Builder 3\application\src\classes\Logic.as:346] > > at flash.events::EventDispatcher/dispatchEventFunction() > > at flash.events::EventDispatcher/dispatchEvent() > > at > > > mx.core::UIComponent/dispatchEvent()[E:\dev\beta1\frameworks\projects\framework\src\mx\core\UIComponent.as:11260] > > at Classes::Logic/onBrowserLocationChange()[C:\Users\user\Documents\Flex > > Builder 3\application\src\classes\Logic.as:73] > > at flash.events::EventDispatcher/dispatchEventFunction() > > at flash.events::EventDispatcher/dispatchEvent() > > at > > > mx.core::UIComponent/dispatchEvent()[E:\dev\beta1\frameworks\projects\framework\src\mx\core\UIComponent.as:11260] > > at > > > mx.controls::HTML/htmlLoader_locationChangeHandler()[E:\dev\beta1\frameworks\projects\airframework\src\mx\controls\HTML.as:1438] > > at flash.events::EventDispatcher/dispatchEventFunction() > > at flash.events::EventDispatcher/dispatchEvent() > > at flash.html::HTMLLoader/onLocationChangeTimer() > > at flash.utils::Timer/_timerDispatch() > > at flash.utils::Timer/tick() > > > > Greets, > > Dauntless > > > > __________________________________________________________ > > This communication is from Primal Pictures Ltd., a company registered in > > England and Wales with registration No. 02622298 and registered office: > 4th > > Floor, Tennyson House, 159-165 Great Portland Street, London, W1W 5PA, > UK. > > VAT registration No. 648874577. > > > > This e-mail is confidential and may be privileged. It may be read, copied > > and used only by the intended recipient. If you have received it in > error, > > please contact the sender immediately by return e-mail or by telephoning > > +44(0)20 7637 1010. Please then delete the e-mail and do not disclose its > > contents to any person. > > This email has been scanned for Primal Pictures by the MessageLabs Email > > Security System. > > __________________________________________________________ > > > > > > __________________________________________________________ > This communication is from Primal Pictures Ltd., a company registered in > England and Wales with registration No. 02622298 and registered office: 4th > Floor, Tennyson House, 159-165 Great Portland Street, London, W1W 5PA, UK. > VAT registration No. 648874577. > > This e-mail is confidential and may be privileged. It may be read, copied > and used only by the intended recipient. If you have received it in error, > please contact the sender immediately by return e-mail or by telephoning > +44(0)20 7637 1010. Please then delete the e-mail and do not disclose its > contents to any person. > This email has been scanned for Primal Pictures by the MessageLabs Email > Security System. > __________________________________________________________ > > > >
