Ah, ok sounds like a better route :-) Thanks for your help Alex! :)
On 01/09/07, Alex Harui <[EMAIL PROTECTED]> wrote: > > Yeah, Tree doesn't like having styles set on it during a scroll, > especially from a renderer. You might actually be setting up an infinite > invalidation loop. You're welcome to file a bug so we can make it less > sensitive, and maybe we should make it easier to override the logic for > icons. Also, setStyle is expensive, and is really telling the Tree that all > icons for all rows should be changed. > > In your case, I would recommend subclassing Tree, overriding makeListData, > and setting the disclosure icon there. > > ------------------------------ > *From:* [email protected] [mailto:[EMAIL PROTECTED] *On > Behalf Of *bjorn - > *Sent:* Friday, August 31, 2007 5:04 AM > *To:* [email protected] > *Subject:* Re: [flexcoders] TypeError in ListBase.as when using setStyle() > in custom TreeItemRenderer > > > > > For your viewing pleasure, here's a simple testcase: > http://www.juicability.com/treetest/ > > Source is also available there... > > Bjørn > > > > > On 31/08/2007, bjorn - <[EMAIL PROTECTED]> wrote: > > > Hi Alex, > > > > I found some examples that did it that way. At first I tried setting the > > style on the itemrenderer itself or otherways just affecting the node - but > > to no avail. > > > > This way works the way I excpect (the nodes get an icon based on their > > type) - *except* for the NullPointerException/TypeError that is ;-) > > > > If you have a better solution please let me know. > > > > I'll try to reproduce it with a testcase. > > > > Bjørn > > > > > > > > On 30/08/2007, Alex Harui <[EMAIL PROTECTED] > wrote: > > > > > > Maybe a bug. Do you have a simple test case? > > > > > > > > > > > > However, why would you set styles on the tree in each renderer? I > > > would think there'll be other problems with that. > > > > > > > > > ------------------------------ > > > > > > *From:* [EMAIL PROTECTED] ups.com [mailto: [EMAIL PROTECTED] > > > *On Behalf Of *bjorn - > > > *Sent:* Thursday, August 30, 2007 4:47 AM > > > *To:* [EMAIL PROTECTED] ups.com > > > *Subject:* [flexcoders] TypeError in ListBase.as when using setStyle() > > > in custom TreeItemRenderer > > > > > > > > > > > > > > > > > > I have made a custom TreeItemRenderer and overridden the set data > > > function to change the icon according to the data. > > > > > > > > > > > > This is done something like this: > > > > > > > > > > > > override public function set data(value:Object):void > > > { > > > super.data = value; > > > if(value != null) { > > > > > > var myListData:TreeListData = TreeListData( > > > this.listData); > > > if (myListData) { > > > var fileObject:Object = > > > value; > > > var _tree:Tree = Tree( myListData.owner); > > > > > > if(fileObject.isMovie) { > > > > > > _tree.setStyle('defaultLeafIcon', > > > this.movieIcon ); > > > > > > _tree.setStyle('folderClosedIcon', this.movieIcon ); > > > _tree.setStyle('folderOpenIcon', > > > this.movieIcon ) > > > > > > } > > > > > > } > > > > > > } > > > > > > Hower, in some cases I get this exception: > > > > > > TypeError: Error #1009: Cannot access a property or method of a null > > > object reference. > > > at > > > mx.controls.listClasses::ListBase/styleChanged()[E:\dev\flex_201_borneo\sdk\frameworks\mx\controls\listClasses\ListBase.as:3062] > > > > > > at mx.controls::Tree/styleChanged > > > ()[E:\dev\flex_201_borneo\sdk\frameworks\mx\controls\Tree.as:1048<http://tree.as:1048/> > > > ] > > > at > > > mx.core::UIComponent/setStyle()[E:\dev\flex_201_borneo\sdk\frameworks\mx\core\UICompon > > > ent.as:7222] > > > ... > > > > > > > > > > > > > > > > > > It's the styleChanged() method in ListBase.as which throws the error - > > > on this line: > > > > > > var m:int = listItems[i].length; > > > > > > > > > > > > .. so, it seems listItems[i] is null ? > > > > > > > > > > > > Why? :-) > > > > > > > > > > > > > > > -- > > > > > > ======================== > > > http://www.juicability.com - flex blog > > > http://www.43min.com - funny movies > > > > > > > > > > > > -- > > > > ======================== > > http://www.juicability.com - flex blog > > http://www.43min.com - funny movies > > > > > > -- > > ======================== > http://www.juicability.com - flex blog > http://www.43min.com - funny movies > > > -- ======================== http://www.juicability.com - flex blog http://www.43min.com - funny movies
