Memory cost of unremoved event listeners

Anyone have any insight into the memory usage of
eventlisteners in AS3, and whether allowing them to build up within
an application causes performance issues? Why isnt there a global
method that removes all listeners (or maybe there is?).
Thanks

Thank you kglad. It seems I stumbled upon an interesting
discovery today, and was wondering if you can confirm.
It appears that AS allows you to have duplicate
eventlisteners on objects. In other words, if you add 5 duplicate
listeners to an oject (e.g mc.addEventListener(MouseEvent.CLICK,
someFunction) x 5), then try to remove the event listener
(mc.removeEventListener(MouseEvent.CLICK, someFunction)), it is
only removing one of the event listeners right?
If that is the case, then can I do something like this to
remove them all? while (mc.hasEventListener(MouseEvent.CLICK)){
mc.removeEventListener(MouseEvent.CLICK, someFunction);
Thanks

Similar Messages

Removing Event Listeners - Are they needed all the time

My goal is to increase the performance of my project so I would like to know if it is always a good idea to remove event listeners. More specifically, lets say I have a movie with severals scenes and several frames within those scenes. Each one of the frames has an event listener:
Example:
Scene 1
Frame 1 (EventListener)
Frame 2 (EventListener)
Frame 3 (EventListener)
Frame 4 (EventListener)
Scene 2
Frame 1 (EventListener)
Frame 2 (EventListener)
Frame 3 (EventListener)
Frame 4 (EventListener)
Questions:
Does Flash continue to listen for an event in Scene 1/Frame 1 when the playhead has moved to Scene 1/ Frame 2?
Or does Flash just listen for the events when the playhead is in a particular frame only?
Should I remove the event listener once I leave a particular frame (should there be remove event listeners on each frame)?

Just mentioning, the addEventListener comes with a parameter you can set to true or false called a weak reference. On desktop flash apps it can become time consuming to constantly remove listeners, especially when things drop off the display list frame to frame. You can mark them for automatic garbage collection by using the weak reference property.
e.g.
Credits_bnt.addEventListener(MouseEvent.CLICK, goCredits, false, 0, true); // set weak reference to true (e.g. remove when no references exist anymore automatically)
Eventually garbage collection will remove that reference automatically when there's nothing left on the display list or in memory to use it.
However, if this is targeted at mobile, you absolutely want to remove the reference as soon as possible when it's not needed for memory conservation. On a desktop it's not that big of a deal.

Does removeChild remove the object's event listeners?

Hi
If you dynamically create a parent movieclip, and dynamically add a color picker to each clip, and add an event listener for each color picker, does a removeChild on the parent movieClip remove event listeners belonging to any of it's children?
Thanks
Shaun

Ahh - thanks Ned
Is there any software you could recommend that monitors and shows you what or how many event listeners are open, memory consumption etc, to help you to trim the fat from your coding?
Thanks
Shaun

How to block execution of event listeners

Hi all,
JDev version : 11.1.1.6
My requirement is that I want to block all event listeners like ActionListeners, SelectionListeners, DisclosureListeners, RowDisclosure listeners when the screen is opened in readonly mode.
I could block ActionListeners by disabling command links and command buttons etc.
But there's no way to block SelectionListeners, DisclosureListeners, RowDisclosure listeners.
So Is there any common code which can block all listeners?
Or is there any EventController or something like that which will allow me to control event execution?

I would have if it was just one screen.
There are hundreds of screens.
Anyways, can't I use any javascript to do this? There are some interfaces like EventListeners , classes like EventConsumer etc. Do none of them provide feature to block event listeners?

Help me I'm trying to create event listeners

I am trying to create event listeners
Whenever any keyboard event occurs the string s gets appended by a,c
or p.At the end of the program its supposed to print value of s
But s always happens to null.Please tell me how to correct it....so
that detection is possible for any case
import java.io.*;
import java.awt.event.*;
public class trial {
int x;
public static String s;
//OutputStream f1=new FileOutputStream("file2.txt");
public static void keyReleased(KeyEvent e)
s=s+"a";
public static void keyPressed(KeyEvent e)
s=s+"c";
public static void keyTyped(KeyEvent e)
s=s+"p";
public static void main(String args[])
throws IOException
char c;
BufferedReader br =new BufferedReader(new
InputStreamReader(System.in));
System.out.println("Entercharactes,'q' to quit.");
do
c=(char)br.read();
System.out.println(c);
while(c!='q');
// for(int i=0;i<s.length();++i)
System.out.println(s);

I suggest looking at the java tutorial. Your code completely misses the mark and you need to see examples.

Using Multiple Event Listeners

Hi,
I have a movielcip (A) class in which I have used a Tween class effect on a child movieclip (B) scrollRect. The (B) Movieclip in turn has several movieclips whose have tween class effect being executed on thier child movieclips.
the tweens are all unique to each movieclip
and the event listeners are taken off once completed.
This works all well and good in FLASH IDE...
My problem arises when I try to view this in a browser on a Windows XP
it doesnt work in
Opera Version 9.63
Firefox 2.0
and Google Chrome 2.0
The only browser it works fluently in is
Internet Explorer 7.0.5
What is happening in most cases it that the animation appears to "stick" but i think what may be happening is the listening or removal of the event listeners. The animations are left incompleted.
Is there any rule of thumb when using multiple event listeners?
here is a snippet of some of my code
on click event from movieclip (A)
private function scrollToSlidePrev(e:MouseEvent) {
               if (((slideIndex - 1) >= 0)) {
                    nextButton.mouseEnabled = nextButton.enabled = previousButton.enabled = previousButton.mouseEnabled = false;
                    var position:Number = 0-SLIDEAREA.width;
                    var slide1:TileListSlide = slides[slideIndex] as TileListSlide;
                    var slide2:TileListSlide = slides[--slideIndex] as TileListSlide;
                    scrollSlide(position,slide1,slide2);
tween animation in movieclip (A) on (B)
private function scrollSlide(pos:int,slide1:TileListSlide,slide2:TileListSlide) {
               slide1.resizeSlideTo(0.6); // execute tween on child movie clips in B
               slide2.resizeSlideTo(1); // same as above;
               var rect:Rectangle = sliderMc.scrollRect;
               var tween1:Tween = new Tween(rect,"x",Regular.easeOut,rect.x,rect.x + pos,3,true);
               tween1.addEventListener(TweenEvent.MOTION_CHANGE,setSliderScroll,false,4);
               tween1.addEventListener(TweenEvent.MOTION_FINISH,toggleButtonEnabled,false,3);
tween animation in movieclip (B) children
public function resizeSlideTo(sc) {
               var m:Matrix = tileList.transform.matrix as Matrix;
               var p:Point = new Point (m.a, 0);
               var tween2:Tween = new Tween(p,"x",Regular.easeOut,p.x,sc,3,true);
               if (numericStepper != null) {
                    if (sc != 1) {
                         numericStepper.visible = false;
                         tween2.removeEventListener(TweenEvent.MOTION_FINISH,showStepper);
                    if (sc === 1) {
                         tween2.addEventListener(TweenEvent.MOTION_FINISH,showStepper,false,2);
               tween2.addEventListener(TweenEvent.MOTION_CHANGE,setScaleOnScroll,false,3);
here is the link
http://visual_admin.web.aplus.net/ticker/ticker_widget.html
the effect disables and re-enables the buttons when its done.... then the listeners are removed.
each one with the exception cretes its own unique tween (obviously this is a custom class built as each clip)
i really don't know what to make of it guys

apparantly making the tween a property of the class rather than a random variable in a function worked.....go figure

[JS] Basic question about event listeners and event handlers

I am very new to the whole topic of event listeners and event handlers. I'd run the test for the following problem myself, but I don't know where to start, and I just want to know if it's impossible -- that is, if I'm misunderstanding what event listeners and event handlers do.
Say I have an InDesign document with a text frame that is linked to an InCopy story. Can I use an "afterImport" event listener on the text frame to perform some action any time the link to the InCopy story gets updated? And will the event handler have access to both the story that is imported, and the pathname of the InCopy file?
Thanks.

Thank you, Kasyan.
Both of those are good solutions.
We are currently using InDesign CS4 and InCopy CS5. I'm hoping to get them to purchase the whole CS5 suite soon, since I'd like to start writing scripts for InDesign CS5 as soon as possible, as long as I'm going to have to be doing it in the not too distant future anyway. The greater variety of event handlers sounds like it might be something that is crucial to the project I'm working on, so that adds to the argument for getting CS5.
Thanks again. You have no idea how helpful this is. I made some promises to my boss yesterday that I later realized were based on assumptions of mine about the InDesign/InCopy system that didn't make any sense, and I was going to have to retract my promises. But after reading your response I think I can still deliver, in a slightly different way that I had been thinking before.
Richard

Documentation for custom event listeners

Hi,
I am searching in portal 8.1 documents for using custom events, coding and registering event listeners, and using them in jsp pages. So far my search has been unsuccessful.
Can some one let me know where i find this info?
-thanks

Hi J,
Thanks for your reply.
I didn’t find the custom work item Web Access control Official documents, but you can refer to the information in these articles(it’s same in TFS 2013):
http://blogs.msdn.com/b/serkani/archive/2012/06/22/work-item-custom-control-development-in-tf-web-access-2012-development.aspx
http://blogs.msdn.com/b/serkani/archive/2012/06/22/work-item-custom-control-development-in-tf-web-access-2012-deployment.aspx
For how to debug TFS Web Access Extensions, please refer to:
http://www.alexandervanwynsberghe.be/debugging-tfs-web-access-customizations/.
For the custom work item Web Access control Official documents, you can
submit it to User Voice site at: http://visualstudio.uservoice.com/forums/121579-visual-studio. Microsoft engineers will evaluate them seriously.
We are trying to better understand customer views on social support experience, so your participation in this interview project would be greatly appreciated if you have time. Thanks for helping make community forums a great place.
Click
HERE to participate the survey.

Event Listeners VS Event Functions

I'm working on a new project at work where there's lots of
custom objects with lots and lots of event listeners. I keep
finding myself saying, "why didn't they just use the built in
objects with built in event handling?". However, from what I can
see it seems like AS3 leans heavily towards using Event Listeners
as opposed to putting event responsibility on the object itself
(E.G. XML.onload). Is there an advantage to this (other than making
it more Java like?) I've always favoured keeping the responsibility
on the object itself because it seems like one less object to keep
track of and also makes things feel more self contained. If I have
10 objects that fire 10 different events, I have to create 10
different event handlers (or 10 different case statements within
the same event handler), whereas with self event handling, I just
code in the event function.
Anyways, I wanted to open discussion to which method of event
handling you prefer and why, and also what you believe the
advantages to this. I was searching google for previous discussions
on this but I couldn't seem to find anything, so I thought I'd get
the ball rolling! Looking forward to reading these, try not to be
too elitist in your posts!!

I tried to change getFileOperation to getFileOperation2 in one of the functions as follows but same problem appeared.
function f3 (event:MouseEvent):void
trace("f3 triggered");
getFileOperation2.addEventListener(ResultEvent.RESULT, f4);
Do you have an idea how I can avoid the same function from triggering twice?? thanks a lot

Loading/Unloading a .swf that adds event listeners to the Stage

Hi all,
Disclaimer
Apologies if I suck so bad at using forum search that the answer to this is on page 1 somewhere; I tried...
Question
I am loading and unloading a .swf to which I do not have source code access. This .swf places several event listeners on the stage, as far as I can tell. When the .swf is unloaded, the event listeners placed upon the stage still seem to be in effect. Using unloadAndStop doesn't seem to do it, and I have to target Flash Player 9, anyway, so can't really use it. Is there any other way I can keep this external .swf from holding onto my main movie's stage?
Additional info
All eventListeners and references being set by my code are removed.
I've managed a little contact with the author of the .swf:
I've requested he provide a dispose() method I can call to get all the listeners removed, and send an updated .swf.
He's suggested that I should be able to avoid the problem by loading into a unique ApplicationDomain. I'm not terribly familiar with this, but have given it a try without much success. Is this a valid solution - can I really protect my 'stage' by properly using ApplicationDomains - or do I need to persist in trying to get a public dispose() method built in?
Thanks in advance!
Cheers, John

thanks for reply sir
sir actually, i have not any problem with loading any file but i need to go back to intro.swf file when i click on clsbtn of main.swf, i want unload the main.swf file and panel.swf file
actually i did was, i have intro.swf file and there is button by clicking load main.swf file (where is timeline controling butons) and in the main file automatically load panel.swf file ( where is all animation)
its all play gud , no problem
but my problem is there is a clsbtn in main.swf file and when i click on that button everything should be unload and it should return on the previous position in intro.swf
i hope u understand what i am trying to say

Add event listeners to dynamically loaded symbols?

Hi,
I'm trying to dynamically load different MovieClips based on user input. Several of those clips have embedded url link symbols. How can I add event listeners to the url links if the dynamically loaded MovieClip does not have an instance name? Seems like I can (right?) apply an instance name when the clip is loading, but the event listener doesn't compile because the name is not there yet, so that seems out.
Am I on right track?

Are you saying that you will instnatiate this symbol several times and each time url for this link is going to be different?
There are at list two ways to deal with it.
1. Inside symbol you can dispatch a custom event once it is clicked:
myLink.addeventListener(MouseEvent.CLICK, onClick);
function onClick(e:MouseEvent):void {
dispatchEvent(new Event("linkClick"));
Wherever you instantiate the symbol (perhaps on timeline):
var symbolInstance:MySymbol = new MySymbol();
symbolInstance.addEventListener("linkClick", onLinkClick);
function onLinkClick(e:Event):void {
// do whatever
Second way would be to pass url value into symbol instance itself and deal with with it on a symbol level. I personally prefere way 1.

Spry event listeners with dynamic form elements

Hi ,
I am trying to implement spry event listeners with a form that has dynamic check boxes and text field name. I now i can get the elements in a var and loop through with a normal function but can this work for spry events listeners

Short answer is yes. But I have a feeling that you need further assistance, in which case give us a URL to a page that you want to apply the event listener to.

[svn:osmf:] 15000: Fix for FM-447 : Adding CuePoint in TemporalFacet event listeners doesn't work

Revision: 15000
Revision: 15000
Author:   [email protected]
Date:     2010-03-24 14:01:02 -0700 (Wed, 24 Mar 2010)
Log Message:
Fix for FM-447 : Adding CuePoint in TemporalFacet event listeners doesn't work
Ticket Links:
    http://bugs.adobe.com/jira/browse/FM-447
Modified Paths:
    osmf/trunk/framework/OSMF/org/osmf/metadata/TimelineMetadata.as

[svn:osmf:] 14975: Fix for FM-447 : Adding CuePoint in TemporalFacet event listeners doesn't work

Revision: 14975
Revision: 14975
Author:   [email protected]
Date:     2010-03-23 17:04:43 -0700 (Tue, 23 Mar 2010)
Log Message:
Fix for FM-447 : Adding CuePoint in TemporalFacet event listeners doesn't work
Ticket Links:
    http://bugs.adobe.com/jira/browse/FM-447
Modified Paths:
    osmf/trunk/framework/OSMF/org/osmf/metadata/TimelineMetadata.as

All event listeners and models in one file?

I have one java file for all my event listeners of a programm and one java file for all my models. Is this good?
I create instances with new AllInOneHandler.MouseHandler() for example.
Or should I have one file for each event and each model?

Hi,
you should have one file for each class or interface - this gives you best control and reusability. Also when you have javadoc-comments in it, big files with many classes in it will become hard to edit.
When using one file for each class or interface you can import only the needed classes or interfaces instead of importing whole packages - so it is easier to see, what is exactly imported. As so a good structured application has many classes, where each of them is small (and in an own source file), you will have less problems during the evolution of your classes this way.
If you want to group some classes, why not use sub-packages for this purpose?
greetings Marsian

Memory cost of unremoved event listeners

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