Actionscript 3 :: Event Listener Added By A Weak Reference
Aug 29, 2011
My problem is basically as follows. There is an instance of a class extending EventDispatcher. Everything goes well when I add event listener to the object like this:
[Code]...
Now someFunction is not called even though the line containing dispatchEvent('eventName') is being executed just like before (and there is an external reference to myObject as well). The application I'm developing is quite complex so, unfortunately, I can't post the exact code.
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Similar Posts:
Jul 31, 2010
Just as a test, here's the entirety of my code:
[code]...
I never ADDED the corresponding event listener. Why doesn't Flash complain that I'm trying to remove something I never added?
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May 6, 2010
package uk.co.bigroom.utils
{
import flash.utils.Dictionary;
/**
* Class to create a weak reference to an object. A weak reference
[code]....
In this Class, how they denote one as Weak Reference and one as Strong reference.
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Aug 29, 2010
I'll present my problem in a few steps:
- I have a constructor method which is trigerred automatically once the program starts
- The method's argument determines whether or not an enter frame event is to be added(move:Boolean = true)
- If true, add the event listener
- there are getters and setters created to access the variables from another class
The problem is that the event listener is run only once - at the initial phase, so it checks the move's value just once (true - add, false - don't add), so it can be turned on and off only in this class. I want to allow a user to change its value from an external class, which is impossible even with getters and setters, because it adds the listener before the user even gets a chance to change it. I want the listener to be added only if the user wants it to. I know it looks complicated,
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Dec 27, 2011
I am trying to make an animation with three seperate buttons that when clicked on make one set of text disappear and new text appear in its place. My code so far looks like this:
stop();
//---Bio Button Text---\
go.addEventListener (MouseEvent.CLCIK, bioplay);
[Code].....
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Nov 21, 2009
What is the correct event listener to detect a child added to the stage? I tried:
[Code]...
which doesn't work. I also tried ADDED_TO_STAGE but that doesn't fire it either. Do you know the correct way to detect when the child is added? Perhaps I should be attaching the listener to the parent instead?
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Oct 2, 2009
I'm having trouble getting the Video class to work.. Everything works fine until I try to add an on enter frame event listener to the movie. I basically want to overlay an effect that gets updated every frame but adding the event listener causes the movie to freeze before it loads or on the first frame or just shortly after starting play back.. Check out the source code at [URL]
It freezes even if the enter frame method body is commented out so I don't think it's because of extra overhead..
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Jul 7, 2011
I m using a dynamic text field in my app. I have added one Event.Change Listener on it. When I type into it with the keyboard, the event triggers. But when i set some text in it when user performs some action, like textfieldName.text = "test" then the event does not triggers. In this type of situation where we are not using keyboard, which listener should be added to text field to trigger the change event?
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Apr 19, 2010
As I currently understand, if an event listener is added to an object with useWeakReference set to true, then it is eligible for garbage collection and will be removed if and when the garbage collection does a sweep.
public function myCustomSpriteClass() //constructor {
this.addEventListener(MouseEvent.MOUSE_DOWN, mouseDownListener, false, 0, true);
this.addEventListener(MouseEvent.MOUSE_UP, mouseUpListener, false, 0, true);
}
In this case, is it not appropriate to initialize an object with weak references event listeners, incase the garbage collector does activate a sweep removing the objects event listeners since they were added during initialization of the object? In this case, would it only be appropriate to create a type of deallocate() method which removes the event listeners before the object is nullified?
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Jun 8, 2010
As I understand it if I set the weak reference param to true in my event listeners I don't need to worry about removing the listeners. I'm not really clear what would cause the listener to be set for garbage collection. I would hate to have a situation where the listener was removed before I wanted it to.
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May 26, 2010
I got a reference to an arrayCollection and add event listener like this:
collection.addEventListener(CollectionEvent.COLLECTION_CHANGE, onCollectionChange);
That's fine. Now some other component does have the same reference and is adding items to and removing items from that collection.
Each time the handler is called:
private function onProjectPersonsChange(event:Event):void {
if (event.kind == CollectionEventKind.ADD) {
//do something
} else if (event.kind == CollectionEventKind.REMOVE) {
[Code] .....
Why the removed item is not in 'items'?
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Dec 15, 2009
I have a project with 15 dynamically created MovieClips on. The clips are images loaded from XML.As each one is loaded I assign an id to it. screen.id = [i];Now normally I would add an event listener to trigger each of these to "Do Something" but I want it to be an automatic process. So I have set up a function to create a random number between 0 and 14 with the idea that I can use the number to help reference the MovieClip with the id of the randomly generated number...But I don't know how to go about this Something like...
Code:
Select allprivate function randomNumber(low:Number, high:Number):Number
{
var low:Number = low;
var high:Number = high;
[code]....
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Feb 4, 2009
this is the error I am having:
TypeError: Error #2007: Parameter listener must be non-null.at flash.events::EventDispatcher/removeEventListener()
at project1_fla::MainTimeline/btnName()
here is my code:
ActionScript Code:
import caurina.transitions.Tweener;
import caurina.transitions.properties.ColorShortcuts;[code]..........
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Feb 9, 2010
so I need to know if there is a way to understand if an Object has listener added to it. I mean:
myObj.addEventListener(event.ENTER_FRAME, handler);
listenerList:Array(?) = myObj.function_I_need();
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Jun 24, 2009
I am wondering if there is a better way to add MOUSE_OVER/MOUSE_OUT listeners to a whole host of objects in my project.
The example is that I am loading in lots of thumbnails for a portfolio viewer. Each thumbnail is an instance of ThumbnailUI Class. Inside ThumbnailUI, I have added both MOUSE_OVER and MOUSE_OUT event listeners. This means that when all of the thumbnail instances are added, I have lots of listeners active at one time. Is this OK? Is there a better way to achieve mouse events on all of these thumbnails?
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Sep 3, 2009
Can event listeners only be added to the class which dispatched the event? I ask because I want to have the logic for the listener on the main class, and the action is dispatched on click from a thumb which is instantiated in a scroller class. Kinda like this:
ActionScript Code:
pseudo code:
class main {
main() {
[code]....
This doesn't work. Why can't the main class listen for an event on the thumb class?
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Jan 17, 2011
Hello I need to remove a ENETR.Frame listener to a frame on stage from a symbol.
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Jan 10, 2011
I have created a flash file with animations, buttons and videos which will be uploaded to Zmags - (Digital publishing platform for flat pdfs) Everything is correctly set up on my flash file, and the .swf files work fine independently. Once uploaded to Zmags, when turning to a new page within the interactive pdf, the animations plays a small clip before the page is fully loaded. Once the page is fully loaded, the animations and buttons etc work as they should. I do not want this short clip of animation to run when the page loads.
Now I have been told that the solution will lie with: Event.ADDED_TO_STAGE and Event.REMOVED_FROM_STAGE.
I am informed that these event listeners will ensure the page is fully loaded before the animation plays.how to add these into my ActionScript,.I have the actions on the first frame of the timeline and have used frames to create a contents page, so when your mouse hovers over the pages numbers (buttons), different animations happen (which are contained in the frames) I have no clue what to do next to add Event.ADDED_TO_STAGE and Event.REMOVED_FROM_STAGE.
ActionScript Code:
one_btn.addEventListener(MouseEvent.MOUSE_OVER, onebutton);
function onebutton(event:MouseEvent):void {[code]...............
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Jul 7, 2011
I am trying to learn JavaScript and I am wondering whether JavaScript has a event listener just like ActionScript's ENTER_FRAME. Basically, I want this event listener to listen "all the time" not just wait for any particular instance (mouse click, keyboard event) of event.
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Aug 14, 2009
I have a drag-and-drop event form in a flex project. I need to run a validator right after the item is dragged into the dataGrid. In it, I fire off a function through dragDrop="verifyEventUsers()". In the validator, I compare the contents of the two arrayCollections, but it appears to be running the checks prior to completion of the drop. For instance, if I drag an element into the dataGrid and trace eventUsers.length inside the validator, I get zero. When I drag the second element, it traces as one even though two lines now appear.
How can I set up a validation script that runs after the drag-drop action has finished?
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Nov 22, 2011
I am currently having problems referencing a MovieClip child which I add to the Stage from the Document Class. Basically when the MovieClip child is added to the Stage from the Document Class, I want a certain MovieClip already on the Stage to reference it once it is on the Stage.
Also, if it is possible, I don't want the MovieClip referencing the child being added to the Stage to have parameters linking it with the Document Class, because I plan on nesting this MovieClip within another MovieClip later on in the future.
Here is the code for the MovieClip class which is referencing the child once it is added to the Stage:
package com.gameEngine.assetHolders
{
import com.gameEngine.documentClass.*;
import com.gameEngine.assetHolders.*;
[Code].....
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Nov 17, 2011
if I have an event listerner (mouse, keyboard, enterframe,....event) that is being triggered, and when it finishes its event, something that is able to detect the finished event listener and fire out another sets of event.
It works more like MOTION_FINISH in TweenEvent, but it is only available for TweenEvent only, what if I want to detect a mousclick, keyboard, enterframe or even touch event?
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Feb 23, 2011
My stage has about 25 buttons on it. Each button when pressed to tweens the background to some random x/y coordinates and then loads an external swf file.This is all working, but the timing is off. How can I wait for the initial background tween to end before I make the loader call to the .swf file.Currently each button's behavior is called on the MouseEvent.CLICK event which calls a function that knows its unique filename.swf. I know you can add the MOTION_FINISH even to the tween event but then I would have to call a new function and lose track of the button that initially called it.
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Feb 27, 2007
I'm moving on to my next massive programming project and I'm trying to decide whether I should code it in as 2.0 or 3.0. I came across the new click event model in 3.0. Right now it's looking like a pain in the butt to me. So now I have to make a function and add it as an event listener? what the hell? What's the benefit? I understand stuff like this makes AS a more complete language but it's kinda annoying.
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Aug 20, 2009
This is a very basic question but I can't seem to find an answer. I have a mouse over event and have created the buttons with the mouse overs which is working great. I created the actionscript to go to a specific web page when a user clicks the button. Now, I need to add a label to the mouse over so when someone mouse's over any area of the button, it will show them a particular name for the button.
I am sure that this can be done using actionscript in a mouse event roll over command but I can't figure out what I need to show the text. Here is where I am:
[Code]..
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May 13, 2010
how can i access event.target outside event listener method.say for example
my_mc.addEventListener(MouseEvent.CLICK, onC);
function onC(e:MouseEvent):void
{
var m:MovieClip = e.target as MovieClip;
}
trace(m.totalframes);/// not working
now what if i want to get totalframe property of m instance, in short for every movieClip clicked.
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Jul 8, 2011
I am doing this inside a module containing viewstacks and their childs.Calling onInit() on creationComplete of module.When I am inside one of the childs of a viewstack of this module and press Enter, it doesnt not invoke the listener function at all (bp inside this does not get hit).
private function onInit():void{
this.addEventListener(KeyboardEvent.KEY_DOWN, keyPressed);
}[code]..........
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Nov 18, 2011
This might be more of a subjective question, but is it generally best practice to have one dedicated method per event-types that you add an event-listener?
Such as:
myButton.addEventListener(MouseEvent.MOUSE_OVER, onMouseOver);
myButton.addEventListener(MouseEvent.MOUSE_OUT, onMouseOut);
//Somewhere else in the code...
[Code].....
And if you had a MouseEvent.MOUSE_UP, MouseEvent.MOUSE_DOWN and other relevant MouseEvents event-listeners to watch for, you could even set a switch statement to handle all the various MouseEvent types.
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Jul 30, 2009
I have these buttons in a movie clip and I would like to have only one event listener for the parent, using event.target to point to the children. I have also tried event.currentTarget, and it didn't work.here is the code that works:
test01.abtn.addEventListener(MouseEvent.ROLL_OVER, mouseHandler);
test01.bbtn.addEventListener(MouseEvent.ROLL_OVER, mouseHandler);
test01.cbtn.addEventListener(MouseEvent.ROLL_OVER, mouseHandler);[code]....
It is only targeting the movie clip, not the buttons inside the movie clip.
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Jan 7, 2010
how to add an event listener to an event from a custom class. Here are the relevent lines of code (I think) from the class:
[Code]....
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