Tremendously illuminating. Thanks, guys. -- David
--- In [email protected], "Tracy Spratt" <tspr...@...> wrote: > > One more thing. A custom event is not always required. Any public > property on the dispatching object can be read via the target or > currentTarget properties of the standard Event. > > > > Folks will argue OOP principles about this, but the choice is yours. > > > > Tracy > > > > ________________________________ > > From: [email protected] [mailto:[email protected]] On > Behalf Of Tracy Spratt > Sent: Monday, January 05, 2009 6:56 PM > To: [email protected] > Subject: RE: [flexcoders] Re: why I can not dispatchEvent with > creationComplete? > > > > SystemManager is the parent of Application. Set the listener on that > and it will hear all events, including from Application and from > pop-ups. > > > > But events propagate *up*. If you dispatch an event in a child > component, its siblings will not be able to listen for it. Huh, as Josh > just beat me to the punch. > > > > You could also set the listener on a reference to > Application.application instead of SystemManager: > > creationComplete="Application.application.addEventListener(FoodEvent.FOO > D_EVENT, foodEventhandler)" > > that will not hear events from pop-ups, though. > > > > Tracy > > > > ________________________________ > > From: [email protected] [mailto:[email protected]] On > Behalf Of stldvd > Sent: Monday, January 05, 2009 6:05 PM > To: [email protected] > Subject: [flexcoders] Re: why I can not dispatchEvent with > creationComplete? > > > > Thanks for the help so far. > > In the application from which this simple sample is derived, I'm not > actually in Application, so I definitely want to make them bubble (if > that's the solution). I tried changing bubbles:Boolean=true but that > didn't do anything. What does it mean to 'listen on the SystemManager'? > > --- In [email protected] <mailto:flexcoders%40yahoogroups.com> > , "Josh McDonald" <dznuts@> wrote: > > > > If you want to listen to events that are dispatched from > Application, you > > need to listen at either Application.application or (better) make them > > bubble, and listen on the SystemManager. > > > > -Josh > > > > On Tue, Jan 6, 2009 at 8:58 AM, stldvd <stldvd@> wrote: > > > > > OK, here's a little app to demonstrate the problem. I'm sure the > > > answer is obvious, but... can someone point it out? > > > > > > The Application and the Canvas go in the src folder; the custom > event > > > (FoodEvent) goes in an 'events' folder inside src. > > > > > > I made the canvas because I wanted the event to be heard in a > > > different component from the Application itself. > > > > > > <?xml version="1.0" encoding="utf-8"?> > > > <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml > <http://www.adobe.com/2006/mxml> " > > > layout="horizontal" xmlns:food = "*"> > > > <mx:Script> > > > <![CDATA[ > > > > > > import events.FoodEvent; > > > > > > [Bindable] > > > public var food_supply:Array = [{label:"Pizza Pie", > > > data:"Pizza"},{label:"Buffalo Wings", data:"Wings"}]; > > > > > > private function onFoodCBChange():void > > > { > > > var item:Object = foodCB.selectedItem; > > > if(item == null) > > > return; > > > > > > var event:FoodEvent = new > FoodEvent(FoodEvent.FOOD_EVENT); > > > event.selectedItemFromFoodCB = item.data; > > > this.dispatchEvent(event); > > > } > > > ]]> > > > </mx:Script> > > > <mx:Canvas height="167" width="200"> > > > <mx:ComboBox x="40" y="20" > > > dataProvider="{food_supply}" > > > id="foodCB" textAlign="left" change="onFoodCBChange()"/> > > > </mx:Canvas> > > > <food:testCanvas /> > > > </mx:Application> > > > > > > <?xml version="1.0" encoding="utf-8"?> > > > <mx:Canvas xmlns:mx="http://www.adobe.com/2006/mxml > <http://www.adobe.com/2006/mxml> " > > > creationComplete="this.addEventListener(FoodEvent.FOOD_EVENT, > > > foodEventhandler)" > > > borderStyle="solid" borderColor="red" borderThickness="3" > x="300" > > > y="300" width="200" height="200"> > > > <mx:Script> > > > <![CDATA[ > > > import events.FoodEvent; > > > import mx.controls.Alert; > > > > > > private function > foodEventhandler(e:FoodEvent):void > > > { > > > Alert.show(e.selectedItemFromFoodCB); > > > } > > > > > > ]]> > > > </mx:Script> > > > </mx:Canvas> > > > > > > package events > > > { > > > import flash.events.Event; > > > > > > public class FoodEvent extends Event > > > { > > > > > > public static const FOOD_EVENT:String = 'food.event'; > > > > > > public var selectedItemFromFoodCB:String; > //Used to > > > pass selection value > > > > > > public function FoodEvent(type:String, > > > bubbles:Boolean=false, > > > cancelable:Boolean=false) > > > { > > > super(type, bubbles, cancelable); > > > } > > > > > > } > > > } > > > > > > --- In [email protected] > <mailto:flexcoders%40yahoogroups.com> , "Tracy Spratt" <tspratt@> wrote: > > > > > > > > It will depend on where and how the listener is declared. > > > > CreationComplete fires at different times for different > components. As > > > > I recall, it is bottom up, so creationComplete for a parent will > fire > > > > after creationComplete for a child. If the parent creationComplete > > > > handler declares the listener, then there would be a problem. > > > > > > > > > > > > > > > > This should only be an issue on start-up. Certainly the > listener would > > > > be available when the app was ready to receive user input, via > ComboBox > > > > or button click, as the original poster noticed. > > > > > > > > > > > > > > > > Remember that events flow through the DOM. It is possible for a > > > > dispatched event to "miss" a component. Pop-ups are a particular > > > > problem. > > > > > > > > > > > > > > > > Tracy > > > > > > > > > > > > > > > > ________________________________ > > > > > > > > From: [email protected] > <mailto:flexcoders%40yahoogroups.com> > [mailto:[email protected] <mailto:flexcoders%40yahoogroups.com> > ] On > > > > Behalf Of stldvd > > > > Sent: Monday, January 05, 2009 4:48 PM > > > > To: [email protected] > <mailto:flexcoders%40yahoogroups.com> > > > > Subject: [flexcoders] Re: why I can not dispatchEvent with > > > > creationComplete? > > > > > > > > > > > > > > > > I'm having a similar issue. Event is dispatched (I can step > through > > > > code and see it) but the event listener is never hearing it, and > so > > > > the listener function is never being fired. > > > > > > > > How does one tell if the listener is ready or not? If you add the > > > > listener on the creationcomplete or initialize event of an mxml > > > > component, it should in theory be ready to fire, for the duration > of > > > > the app, right? And if you're dispatching a custom event when an > item > > > > is selected in a combobox, it should certainly work. What could > be the > > > > reason for a 'deaf' event listener? :) > > > > > > > > -- David > > > > > > > > --- In [email protected] > <mailto:flexcoders%40yahoogroups.com> > <mailto:flexcoders%40yahoogroups.com<flexcoders%2540yahoogroups.com> > > > > > > > > , "Tracy Spratt" <tspratt@> wrote: > > > > > > > > > > Perhaps the listener is not yet ready when the canvas > creationComplete > > > > > fires? > > > > > > > > > > Tracy > > > > > > > > > > > > > > > > > > > > ________________________________ > > > > > > > > > > From: [email protected] > <mailto:flexcoders%40yahoogroups.com> > <mailto:flexcoders%40yahoogroups.com<flexcoders%2540yahoogroups.com> > > > > > > > > [mailto:[email protected] > <mailto:flexcoders%40yahoogroups.com> > <mailto:flexcoders%40yahoogroups.com<flexcoders%2540yahoogroups.com> > > > > > > > > ] On > > > > > Behalf Of markflex2007 > > > > > Sent: Monday, January 05, 2009 2:08 PM > > > > > To: [email protected] > <mailto:flexcoders%40yahoogroups.com> > <mailto:flexcoders%40yahoogroups.com<flexcoders%2540yahoogroups.com> > > > > > > > > > Subject: [flexcoders] why I can not dispatchEvent with > > > > creationComplete? > > > > > > > > > > > > > > > > > > > > I try the following code, But I can not dispatchEvent. > > > > > > > > > > <mx:Canvas xmlns:mx="http://www.adobe.com/2006/mxml > <http://www.adobe.com/2006/mxml> > > > > <http://www.adobe.com/2006/mxml <http://www.adobe.com/2006/mxml> > > > > > > <http://www.adobe.com/2006/mxml <http://www.adobe.com/2006/mxml> > > <http://www.adobe.com/2006/mxml <http://www.adobe.com/2006/mxml> > > " > > > > > creationComplete="justLogin()" > > > > > > <mx:Metadata> > > > > > [Event(name="loginEvent", type="flash.events.Event")] > > > > > </mx:Metadata> > > > > > <mx:Script> > > > > > <![CDATA[ > > > > > > > > > > > > > > > private function justLogin():void{ > > > > > > > > > > dispatchEvent(new Event("loginEvent", false)); > > > > > > > > > > } > > > > > ]]> > > > > > </mx:Script> > > > > > > > > > > </mx:Canvas> > > > > > > > > > > I can dispatchEvent with button click, please let me know how to > > > > > automatic dispatchEvent in page start. > > > > > > > > > > Thanks > > > > > > > > > > Mark > > > > > > > > > > > > > > > > > > > > > ------------------------------------ > > > > > > -- > > > Flexcoders Mailing List > > > FAQ: > http://groups.yahoo.com/group/flexcoders/files/flexcodersFAQ.txt > <http://groups.yahoo.com/group/flexcoders/files/flexcodersFAQ.txt> > > > Alternative FAQ location: > > > > https://share.acrobat.com/adc/document.do?docid=942dbdc8-e469-446f-b4cf- > 1e62079f6847 > <https://share.acrobat.com/adc/document.do?docid=942dbdc8-e469-446f-b4cf > -1e62079f6847> > > > Search Archives: > > > http://www.mail-archive.com/flexcoders%40yahoogroups.comYahoo > <http://www.mail-archive.com/flexcoders%40yahoogroups.comYahoo> ! Groups > > > Links > > > > > > > > > > > > > > > > > > -- > > "Therefore, send not to know For whom the bell tolls. It tolls for > thee." > > > > Like the cut of my jib? Check out my Flex blog! > > > > :: Josh 'G-Funk' McDonald > > :: 0437 221 380 :: josh@ > > :: http://flex.joshmcdonald.info/ <http://flex.joshmcdonald.info/> > > :: http://twitter.com/sophistifunk <http://twitter.com/sophistifunk> > > >
