I use a strong listener only when I know I'm not holding a reference to the dispatcher anywhere else. In all other cases, i.e. if I know I'm going to be keeping the dispatcher on the display list (if it's a DisplayObject) until I no longer need it, or if I know I'm storing a reference the dispatcher somewhere in a parent class or a dictionary or something, I always use a weak reference. That way, if I forget to remove the event listener in a destroy method or whatever, it should still end up eligible for GC.
Cases where the event doesn't fire because a weak reference was used only happen if there are no strong references anywhere else, so the object rightly gets GC'd Piers On 7 Feb 2010, at 13:27, Cor wrote: > Could you give an example of the way you use the strong listener? > > TIA > > -----Original Message----- > From: flashcoders-boun...@chattyfig.figleaf.com > [mailto:flashcoders-boun...@chattyfig.figleaf.com] On Behalf Of Steven Sacks > Sent: zondag 7 februari 2010 4:32 > To: Flash Coders List > Subject: Re: [Flashcoders] Re: is it ever ideal to NOT use weak references? > > function loadImage():void > { > var loader:URLLoader = new URLLoader(); > loader.addEventListener(Event.COMPLETE, onComplete, false, 0, true); > loader.load(new URLRequest(url)); > } > function onComplete(event:Event):void > { > trace(event); > } > > Guess what never fires? If you guessed "onComplete", you win the prize. > > Now imagine that it defaulted to true and you wrote the same thing leaving > off > the false, 0, true. You would have no idea why it didn't work. > > It didn't work because the loader was cleaned up by GC as soon as the > loadImage() function reached the end. > > Generally, I only use weak listeners with Timers and enter frame listeners. > Everything else I use strong listeners and write a remove listener for them > when > they're expected to unload or be garbage collected at some point. > _______________________________________________ > Flashcoders mailing list > Flashcoders@chattyfig.figleaf.com > http://chattyfig.figleaf.com/mailman/listinfo/flashcoders > No virus found in this incoming message. > Checked by AVG - www.avg.com > Version: 9.0.733 / Virus Database: 271.1.1/2673 - Release Date: 02/07/10 > 08:22:00 > > _______________________________________________ > Flashcoders mailing list > Flashcoders@chattyfig.figleaf.com > http://chattyfig.figleaf.com/mailman/listinfo/flashcoders _______________________________________________ Flashcoders mailing list Flashcoders@chattyfig.figleaf.com http://chattyfig.figleaf.com/mailman/listinfo/flashcoders
