Actionscript 3 :: Setting An Object To Null, Automatically Remove All Attached Event Listeners?
Jan 20, 2011
Lately I've found myself constantly writing removeEventListeners everywhere, which makes code quite messy. I know it's a best practice and such, but in general it has no sense. Garbage collector should handle such a simple task by itself, shouldn't it? Is it that hard to remove all listeners automatically when object is set to null?
So I just want to be sure if that's the case. Does setting an object to null, automatically remove all attached event listeners? In my case scenario is like this - I create an object and attach bunch of event listeners to it, then after a while I need to re-initialize this object. Of course setting this object to null is much easier then unbinding every listener by hand. And on most part listeners are anonymous functions, which means that it's not possible without code refactoring. When I simply re-initialize a variable with new I do not get duplicate listeners and such, but I'm not sure that it's previous value, along with all the listeners gets garbage-collected. Is it?
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Jan 24, 2010
In document class action script file I add a movie clip to stage using
Code:
public var square:Square
square = new Square
addChild(square)
So it adds square to stage.Then after sometime I want it to be removed. I call a function "removeSquare" also located in document class. It executes the following code. And it removes the square from stage visualy.
Code:
trace("proff that it's executed")
removeChild(square)
square = null
Then of course I want to add a square to stage again, using code I written at top of the post. And remove it again, and so on..But game is lagging more and more and more. So I guess that the square is not properly removed. If you need more details about my code feel free to say, I just written that since I really doesn't know what else should be important.
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Nov 30, 2010
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?
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Nov 12, 2009
I'm having problem with garbage collection in a large, not-so-well-written project that I didn't start. I am getting memory leaks -- and want to make sure that all event listeners on the offending objects are removed. I've gone through the code and done what I can, but still ain't happening -- is there a way in AS3 to take an object and see IF it has an event listener, and to REMOVE that listener -- that is, to remove ALL listeners, without knowing what they are? I know if I know what the EVENT TYPE is then I can use hasEventListener() to figure out if it has a listener of that type (although the presupposes I know all the event types being used), but if I don't know the function that it's subscribing to then I can't remove it.
Or is there some other way to simply nullify an object for GC? I've changed all listeners to weak -- but I think (since the offending objects are FLVPlaybacks) that something in the flash internal setup is still listening to my object (I've gleaned this from FB 4 profiler which I've used in external mode). I would just, at this point, like to see what's going on.
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Oct 12, 2011
I want to make a static function that I can use in all the custom classes.It should be some kill(); function that would remove the object from the stage as well as removing its event listeners. I made it in Document class, and it didn't work. Here's the code:
ActionScript Code:
public static function kill(e:DisplayObject)
{[code].....
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Jul 28, 2009
sometimes I remove child and trace it afterwards and it outputs null although I havent yet set it to null, why is that? and do I need to set it to null also in that case?
Code:
trace(holderArr[loadedThumbs].getChildByName("photo_bg"));
//[object MovieClip]
holderArr[loadedThumbs].removeChild(holderArr[loadedThumbs].getChildByName("photo_bg"));
[Code]....
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Nov 24, 2009
I seem to be having a recurring problem attaching events to a button i have created within 2 other movieclips.I get the following error:
TypeError: Error #1009: Cannot access a property or method of a null object reference.
So it looks like it can't find the button, in order to attach the event listener. The question is why? I am attaching a similar event to a button on the main timeline and that works fine. So it looks like a scope issue, but I am referring to it properly.
code below:
Code:
import flash.net.navigateToURL;
import flash.net.URLRequest;
import flash.display.*;[code]................
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Jan 21, 2011
I have 3 frames each with a movie clip called map_mc. Each different map_mc have different objects that call the CollisionDetect class. Heres whats happening. objects from frame 1 will start freaking out when I goto frame 2. How do I remove only the event listeners from objects only on frame 1?
I have been trying this.currentFrame but the problem is that all the objects are inside map_mc on the first frame so no matter what it will always be 1. On the other hand MovieClip(root).currentFrame will always give me the current frame but wont tell me what the objects frame is relative to the stage.What I want to do is have something to this effect:MovieClip(root).this.currentFrame would output that this object is on frame 1 and MovieClip(root).currentFrame will tell me that the stage is on frame 2 so I can remove the listeners accordingly.
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Mar 25, 2009
I have a page that I'm working on that works great except I keep getting an "Output" message stating: TypeError: Error #1009: Cannot access a property or method of a null object reference. at StillFrameFoto_fla::MainTimeline/portfolioOut() I'm pretty sure I just need to get rid of my button instance, but I don't know how. I have my buttons on frame 1 and I want them completely gone when it moves to frame 2. Here is the code for one of my buttons on the first frame:
[Code]....
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Jul 19, 2005
I have a couple of components on stage that I need to disable mouse events on. I've been looking through the documentation, and it looks like the components probably have a Mouse listener setup, and then they fire off their functions when their listeners are notified of an event. In order to remove a Mouse listener, I need to know the instance name of the listener object, is there a way of referencing this? I couldn't find it as a built-in function.
Maybe I'm off-base, and there's a better way to get a component to stop responding to mouse events. I tried
[Code]...
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Jun 15, 2011
I came in to flash on ActionScript 3 and when I was starting out just over a year ago I realised how much of a bother finding keyCodes was and changing controls was just as long as had to look up the new one I wanted to use. My solution was to (eventually) write a class that handles all of my key presses and event listeners attached to that stuff. instead of using keyCodes, the functions use strings for their arguments making it easier to see what keys you want to do what. Initially the class only worked for letters and numbers but I managed to make it easily customisable and includes the arrow keys, numpad numbers, space, enter, shift and control keys.
The reason why I wrote this thread was because: I plan on making it a public class (available to anyone who wnats to use it) and b) to see if there were any specific functions that people think may be useful. So far there are the standard key-down and onRelease type functions as well as a function that only returns true once for the duration that a key is down - difference between pressing and holding.
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May 14, 2009
I was just wondering--and it's probably an obvious question really--if I make an object null and that object had one or more event listeners registered, are the listeners removed?
for example:
Actionscript Code:
object.addEventListener(Event.SOME_EVENT,callBack);
function callBack(evt:Event):void
{
object = null;
[Code].....
In this case have I removed 'object''s listener when I made the object null?
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Jan 23, 2011
How do you know when you should remove event listeners? For example, I know that if I have a TimerEvent listener, I can safely remove that event when I have stopped and / or deleted my timer. Or, if I have a display object on the stage, and I remove it, I can safely remove any event listeners associated with the display object.
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Jan 31, 2009
I've placed listeners on the var "topic_mc" (below), but I'm not sure how to remove them properly:
Code:
private function layoutTopics(modNum:Number, attachTo:MovieClip):void {
topicLength = MainMenu.modArr[modNum].topicArr.length;
if (Interface._ui != null) {
[code]...
doesn't really work - the listeners keep running. How do I call the objects properly to remove the listeners?
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Feb 2, 2009
I've placed listeners on the var "topic_mc" (below), but I'm not sure how to remove them properly:
Code:
private function layoutTopics(modNum:Number, attachTo:MovieClip):void {
topicLength = MainMenu.modArr[modNum].topicArr.length;
if (Interface._ui != null) {[code]....
doesn't really work - any trace statement I place within the event function will run for infinity. How do I call the objects properly to remove the listeners? Note: I've tried referring to currentTarget instead of target but that doesn't make any difference.
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Oct 22, 2010
is it necessarily to add and remove event listeners like so:
Code:
addEventListener(MouseEvent.MOUSE_DOWN,mDown);
function mDown(e:MouseEvent){
removeEventListener(MouseEvent.MOUSE_DOWN,mDown);
[code]....
assuming rapid input, is it really better to do this rather than just let the mouseDown and MouseUp Listeners run all the time? It seems like it would be strenuous to constantly add and remove listeners like this. But this is how i generally see it done..
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Jun 10, 2010
circDraw.addEventListener(Event.ENTER_FRAME,function(e:Event){expand(e .target); },false,0,true);
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obj.height+=3;
obj.width+=3;
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Apr 4, 2011
What I am trying to do is, if a user presses keyboard (key 1), picture 1 should FadeIn and if a user presses keyboard (key 2) picture one should FadeOut and picture 2 FadeIn and vice-versa. With the code mentioned below it works fine sometimes if I am not pressing any other key while it is performing one action but sometimes it behaves weird also. What I want AS3 to do is not to take any action or in other words it should not listen to keyboard until it finishes the opening or closing animation of a picture or any other object assigned to the key.
stage.addEventListener (KeyboardEvent.KEY_DOWN, KeyDownHandler);
/**///keyboard keycode for 1 & 2var key1:uint = 49;
var key2:uint = 50;
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var BG2:Image2 = new Image2();
[Code] .....
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Aug 7, 2011
In some cases it is important to remove multiple event listeners in order to reduce CPU time.[code]...
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Aug 4, 2010
Is there some way where I can remove all event listeneres on my components all at once. Expecially when I dont have any prior knowledge of, what all listeners are being attached to my component.
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Feb 5, 2010
I create a stage keyboard event listener in an externally loaded swf such as:
Code:
stage.addEventListener(KeyboardEvent.KEY_DOWN, onDown);
My question is how and where I should remove this event listener? I have added an unload event handler to the external swf like this:
Code:
this.loaderInfo.addEventListener(Event.UNLOAD, unloadHandler);
The unloadHandler code looks like this:
Code:
private function unloadHandler(event:Event):void {
stage.removeEventListener(KeyboardEvent.KEY_DOWN, onDown);
}
When the container swf unloads the external swf, unloadHandler() gets called, but with the following error:
TypeError: Error #1009: Cannot access a property or method of a null object reference.
Where should the keyboard event be removed?
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Jan 24, 2009
I am creating a large amount of sprites on the fly that have different listeners applied to them -- I want to be able delete these sprites and clear the memory ties that go with them, quick and easy --
Is there a method to detect/remove all listeners on an object without having to check for each one individually?
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Jul 11, 2009
I have a level select screen with about 30 buttons. I created an eventListener for each of these buttons. My question is: When I click a level to enter the game, should I remove all the eventListeners, or would keeping them around not cause any problems?
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Sep 17, 2010
I've managed to create a button which on MOUSE_DOWN scales its parent object- it works just like windows in your OS, where you grab the corner and can change the scale of the window.
Here's how I've done it, (minus the MOUSE_DOWN listener)
Code:
function scaleDragHandler(event:Event):void {
var mcWidth:Number = event.target.parent.width;
var mcHeight:Number = event.target.parent.height;
[Code].....
However, it throws the error, "Access to undefined property 'scaleMC'" on the removeEventListener line. My thought was to put another listener for mouse up inside the first, but that sounds wrong
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Aug 23, 2011
I load into an empty movieclip (via addChild) a library object (a movieclip of class MyObject that extends the MovieClip class). At some point, from the main I remove this custom movieclip from its parent and I set any reference to null to completely destroy it. The question: what if in the custom movieclip class there are eventListeners? Are them deleted when I destroy the object? Should I write a method to remove them before deleting the object?
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Mar 20, 2009
Say I create a new timer:
Code:
var seekTimer:Timer = new Timer(1000,5);
seekTimer.addEventListener(TimerEvent.TIMER, seekTimerHandler);
seekTimer.start();
Now that will run 5 times. Does it automatically remove its event listener after 5 times?
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Mar 30, 2010
I'm currently trying to build my first flash site.I have just set up the buttons which get to each 'section' via frame labels and the AS3 gotoAndStop function.These work without error until my 'sections' contain movieclips that are referenced in my actionscript layer... Because they do not exist in 'all frames', whenever I click my buttons I get the error, "Error #1009: Cannot access a property or method of a null object reference."It took me a while to understand and track down why I was getting this. I removed the short bit of code in my actionscripts layer that referenced the movieclips in each section (I had some custom scrollbars set up) and it worked without error.
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Feb 4, 2010
I'm trying to create a video player in AS3 that displays the player controls when the user hovers over the video, however I'm having a hard time getting the MOUSE_OVER event to fire. I've made sure that the video's index is at the top, so that's not the issue. Is there something I'm missing? Is there any reason why this event listener wouldn't work on a video object? video.addEventListener(MouseEvent.MOUSE_OVER, doThis);
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Jan 7, 2010
I have created a new class, that is basicly just a movieclip but with a builtin eventlistener. When I add a few instances of this class to the stage, they all have the eventlistener. But later on when i remove the intances from the stage and null the references, Will the eventlistener still exist or will it be removed by the GC ?
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Apr 28, 2011
[code]How many event listeners for eventType01 are on object? One or zero?
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