Okay, a combination of factors and I got something "working". I did need to resort to listening for Event.ADDED_TO_STAGE and re-setting popUp value. And I agree with others that that seems sub-optimal. I also needed to set the labelField property for my Tree. And I needed to set the width for my PopUpButton. Ironically, it seems that the much easier and friendly solution of wrapping an HBox around the Tree looks and behaves much better for my purposes... Now I need to figure out what it take to create some sort of floating windoid... oh joy. -eric
--- In [email protected], "Eric Cooper" <[EMAIL PROTECTED]> wrote: > > I have spent the day trying to understand how to get a dynamically-backed > hierarchical popup menu to work (within a ControlBar). I have gone from a fairly > complex starting point to a minimal test case - and things are still not > working. I am seeing three failures, depending on how I attempt this feat. > > I have an ArrayCollection which is static (thanks to posting by Peter Ent): > > public var componentsAC:ArrayCollection = new ArrayCollection( > [ > { name: "Polygon_1", data: "top", children: new > ArrayCollection( > [ > { name: "Line_sement_2" }, > { name: "Line_sement_3" }, > { name: "Line_sement_4" }, > { name: "Line_sement_5" } > ]) > } > ]); > > a Tree and a PopUpButton: > > private var popbComponents:PopUpButton = new PopUpButton(); > private var treeComponents:Tree = new Tree(); > > and I have a utility method with a couple of boolean arguments for testing > purposes. > > private function makeComponentsUI(usePopUpButton:Boolean, > > validateProps:Boolean=false):void > { > treeComponents.showRoot = true; > treeComponents.labelFunction = treeLabel; > treeComponents.dataProvider = componentsAC; > if (usePopUpButton) > { > popbComponents.popUp = treeComponents; > popbComponents.label = "Components"; > if (validateProps) > popbComponents.validateProperties(); > addChild(popbComponents); > return; > } > // else > addChild(treeComponents); > } > > and I have three cases: > > 1. Call this.makeComponents(false, false) > > Tree shows up but seems to, somehow, remove all the other buttons and sliders > that precede it in my subclass of ControlBar. This is lacking the popup > aspect and would take much more real estate than it merits, but otherwise is > okay. > > 2. Call this.makeComponents(true, false) > > I get this: > > TypeError: Error #1009: Cannot access a property or method of a null object > reference. > at mx.controls::PopUpButton/commitProperties()[E:\dev\3.0.x\frameworks\projects\framew ork\src\mx\controls\PopUpButton.as:469] > at mx.core::UIComponent/validateProperties()[E:\dev\3.0.x\frameworks\projects\framework \src\mx\core\UIComponent.as:5670] > at mx.managers::LayoutManager/validateProperties()[E:\dev\3.0.x\frameworks\projects\fra mework\src\mx\managers\LayoutManager.as:519] > at mx.managers::LayoutManager/doPhasedInstantiation()[E:\dev\3.0.x\frameworks\projects\ framework\src\mx\managers\LayoutManager.as:669] > at Function/http://adobe.com/AS3/2006/builtin::apply() > at mx.core::UIComponent/callLaterDispatcher2()[E:\dev\3.0.x\frameworks\projects\framewo rk\src\mx\core\UIComponent.as:8460] > at mx.core::UIComponent/callLaterDispatcher()[E:\dev\3.0.x\frameworks\projects\framewor k\src\mx\core\UIComponent.as:8403] > > which seems related to another topic that was discussed - except that I do > not think that I am removing anything from the stage (at least not knowingly). > > 3. Call this.makeComponents(true, true) > > It doesn't crash, so that's good, I guess ;-) But all I get is a popup button > labeled "Components" - but which lacks any popup-ness. > > I would prefer to find a solution that works with ArrayCollection instead of > with XMLListCollection. And, fwiw, I was able to get things working with a Menu > and ComboBox, but that lacked the hierarchical aspect. > > Thanks for any help with this. > -eric >
