Actionscript 3 :: Dispatching Events From Parent Class To Child Class
Apr 30, 2010
I think this is a pretty simply problem but I do not seem to be able to pull it off. Basically I have a parent class A, and a child class B.Class A instantiates class B with addChild.There is a shared object which is being updated from a java server (red5) that has an event listener attached to it in class A.I have a function in class A which will pass certain, specific updates from this shared object to class B.The problem occurs is that when class B is instantiated, the event listener from class A doesn't work anymore. I have not removed the event listener from A.?
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Similar Posts:
Dec 15, 2009
package com.services
{
import com.asfusion.mate.events.ResponseEvent;
import com.events.navigation.DesgManagementEvent
import flash.events.EventDispatcher;
import mx.controls.Alert;
[Code]...
I am able to get the result, but not able to dispatch the event from the custom actionScript class. I googled and got the riposte that you need to add it to display list.
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Dec 21, 2011
I have a main application Planner.mxml. This view has a couple of custom components, one of which is LoginView.mxml. In LoginView.mxml I do the following:
protected function btnLoginClick(event:MouseEvent):void
{
try
{
[code]....
As you can see, when the user is successfully logged in, I want to dispatch a custom event; if not, I show an alert box. However, this event doesn't dispatch (or at least, I don't know how to listen for it).
I would like to listen for it in my main application where I can then change my viewstate to the logged-in state. However, the event never seems to get there. I listen for it by having loggedIn="loggedInHandler(event)" on my loginComponent.
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Aug 3, 2010
However, it seems to me as I've started building this (or trying, rather) that there's no way this can be done, but I'm sure I'm wrong. Since the static class is never added as an instance to the display list, the stage (or any object for that matter) will never hear any events it dispatches.I've searched and found this, but that doesn't seem to be the right solution since I'm listening for my custom LinkEvent event from the stage, and *not* in the class calling the dispatch function in the static dispatcher class.And to reiterate, the goal is to have a single class I can use throughout my application that dispatches my custom LinkEvent event with two properties: linkURL, and linkTarget.The whole reason for wanting to do this is so I can have some control over what happens (to track, or do some other behavior) when someone clicks on a link created within an htmlText TextField with an <a>
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Feb 16, 2012
I'm curious about event performance. I have a custom class that downloads files from a server and writes to your local system with AIR. This class has a few custom events that fire during a download process: File starts downloading, files finishes downloading, error occurred, progress, and a few others. This class was built for a specific project, but made coupled so it can be used for anything else wanting to download a file from a server. I'm starting to implement it into a new project, and a few events I'm not listening for, such as when the file starts downloading, or the progress of it, just the complete.
Does it strain overall performance having all the other events still dispatching, when I know they aren't being listened to? Would be be better to comment out the dispatchEvent() for the specifics I know aren't used, or does it even matter? There's obviously events dispatched throughout the SDK that aren't always listened for: Right click, drag, resize, etc. This makes me think it doesn't matter that these events fire but aren't handled, but since code is running and things are happening, that means there is performance going on.
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Apr 3, 2009
Would it be possible for me to also dispatch non-custom events (like Event.CHANGE) from inside a class? I already did this with custom events which worked fine, but when I try to dispatch a the Event.CHANGE it will tell me that I am trying to convert a String into an Event (??). What I do is:[code]
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Nov 25, 2010
Lets say I have a Main Document Class called Main. I also have a child class called childClass that call a function from the Main class and is also imported in the Main class. How should I call the function? I tried this , but when calling the function, it's getting me error.
Main class :
Code:
package {
import flash.display.Sprite;
import com.childClass;
[Code].....
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Nov 15, 2011
When dispatching events in as3 I always have to extend class from sprite, or movieclip, but when I don't have display objects I don't wont to extend to sprite or movieclip. What is the most light class that I can extend, I mean no display object, and still do use event dispatching?
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May 5, 2011
`i'have a problem with listening events dispatching from their child classes. for example i have contentManager object which is controlling content at the top level of stage. it has a imageGallery object and in the imageGallery objectthere ise a collectionLoader object which is loading images.
now i want to add one preloader to contentManager which always listen for ProgressEvent. when the progressEvent dispatched i want to preloader going to active. becouse there is another objects that are loading images or other kind of files. i think it is a good apporach to solve preloader issue. so my problem is, when collectionLoader object loading images with using queLoader. my QueueProgress event dispatches ProgressEvent evey time, but my preloader object stand at the 2 classes up level, doesn't percive this event.
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Jul 17, 2011
would like to receive an event(Dispatchd in Parent swf) in Child SWF, the bold italic text represents the piece of coding i
//in PARENT SWF i have -----------------------------
dispatchEvent(new Event("CloseDoors"))
// in Child SWF --------------------------------
[code].....
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May 8, 2010
I'm building an all flash site, where one .swf acts as the parent, and other external child .swf's are loaded in using .xml. The "Child.swf's" are a mixture of timeline animations, and coded swf's, and the problem I'm having is that they immediately start playing as soon as they are loaded. I've not been able to find any straightforward "child.start() or child.stop()" solutions, so I assume it's more involved than that.
I thought it might be a good idea if I could dispatch events from the parent swf that will set them going. I'm using the sharedEvents method to communicate in the reverse direction (child to parent), but I don't believe it can be used from parent to child (Please correct me if I'm wrong!) I know I could go to each child and put "stop();" in the first frame, but how do I start it again? I would also prefer it if not all the child .swf's started immediately, but to wait until others have completed their routines. Again the way I see it is to dispatch an event from the parent .swf as soon as I'm ready to set them going.
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Oct 6, 2009
I have a dialogBox with 2 buttons - ok_btn and cancel_btn. The code is in a Class - testDialog.
There are 2 issues:When any of the 2 buttons clicked, they dismiss the dialogBox without sending any alert to the parent (main time-line).How to trap the clicked buttonId in the parent.I have just an idea of the solution as dispatching an event in the child and listen for that event in the parent. But, unfortunately, I don't know how to go about it.
To make my point clear, here is the code:
Code:
package
{
import flash.display.*;
import flash.events.*;
[Code].....
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Feb 18, 2009
In a nutshell I have a custom event that I am dispatching from one class that is not getting picked up by the other class even though i have added the appropriate addEventListener calls on its constructor.Here's how the classes are laid out:
application(class/parent)
- network(class/child)
- loginscreen(class/child)
The constructor of the Application class creates and stores references to the network and loginscreen classes:
ActionScript Code:
import com.fg.managers.NetworkManager;
import com.fg.screens.LoginScreen;[code].....
The NetworkManager class extends the MovieClip class as does the LoginScreen and Application classes as well.Now within the oLoginScreen class I dispatch the ValidateCredentialsEvent by calling it this way:
ActionScript Code:
dispatchEvent (new ValidateCredentialsEvent(ValidateCredentialsEvent.VALIDATE_CREDENTIALS, oLoginData, true, false));
Then when I debug the code, I can step through and see that the ValidateCredentialsEvent is being generated but it is never picked up by the oNetworkManager class whatsoever.Is this occuring because the NetworkManager and LoginScreen classes are children of the Application class and because of this can't capture events raised by one another without using the Application class as the intermediary to redispatch these events? My whole idea here was to create a generic network managing object that could be called from anywhere within the application, by any object, using custom events.
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Jan 27, 2010
I've been using greensock classes in a parent movie, but am now looking to use the same classes from within some child movies, but it doesn't work (I presently have to import them into each child movie - what a waste).
Do I need to create the classes as a shared library object perhaps? If so, how would I go about it? as I've only ever done this for MCs or MP3s.
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Jan 28, 2010
I have a SWF with a document class called ClassA. I'm loading in an external SWF with a document class of ClassB. Then ClassB is loading in an external SWF that is used for graphical assets.
The problem is that all of the assets in the third SWF all extend a class called Actor. The assets swf is loaded and set as the var "_assets".[code]...
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Mar 25, 2011
I have a parent sprite containing a child named controlBar, whose visibility is initially set to false. When the parent sprite is moused over, controlBar's visibility is set to true, and when the parent sprite is moused out, controlBar's visibility is set to false again, like so:[code]This works fine when mousing over and out of the parent sprite, but then when I mouse over the controlBar, the parent sprite dispatches the MOUSE_OUT and MOUSE_OVER events again, which quickly sets controlBar's visibility to false and then true, and occasionally causes controlBar to flicker. This is exacerbated when mousing around in controlBar, because it contains four spaced-apart buttons, and the parent sprite dispatches MOUSE_OUT and MOUSE_OVER events when mousing from one button to another.What's a simple way to stop the parent sprite from dispatching a MOUSE_OUT event when mousing over its child controlBar?
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Jun 2, 2009
I wrote two projects using the same 3D library but I modified it pretty heavily in one (to the extent that the inheritance is pretty different on one) - now I need to load one into the other and I'm getting some weird errors that look like the child swf is trying to use the same class definitions as the parent even though it should be in an entirely different namespace.
So - anyone have a tricky way of forcing the loaded swf to use the classes it's compiled with rather than the ones already defined in the parent swf (and vice versa) or do I need to refactor all my stuff?
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Sep 15, 2010
If an object, or say... a document class, creates an instance of a class (and stores it as a variable), and it doesn't pass any arguments to the constructor of the class, can that class object, by simply having a function of it called by the parent, tell who sent it that command/request?In other words, can a class object know who called it (such as it's parent) via a (seemingly) anonymous call?
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Apr 11, 2010
i'm trying to assign a parent's variable from the parent's child
//Parent
public class Main extends Sprite
{
public var selectedSquare:Sprite;
[Code]....
i'm receiving this error, but i'm casting parent from displayObjectContainer to a Sprite so i have no idea why it's not working.
1119: Access of possibly undefined property selectedSquare through a reference with static type flash.display:Sprite.
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Jan 19, 2011
I have a class linked with a movie clip, and in this movie clip I want to be able to add an event listener that calls a function in the Document class (the class you link with the fla as a whole). How can I do that? Say the name of my document class is KPScript.as. In my GameController.as class, I want to listen for key input and call pageChange() in KPScript.as when it gets called. Would I have to import KPScript.as into the GameController.as? If so, I wouldn't want to create another instance of the KPScript object.
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Aug 10, 2010
I cant access to var in parent movie from class in child.I have two swf's: parent.swf and child.swf. In parent.swf in frame 6 is:
Code:
stop();
var TestVar:String = "hello!";[code]....
I was trying use parent, parent.parent, parent.parent.parent etc. and any result - null object error.
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Feb 12, 2011
I'm using a PreLoader as a parent SWF that loads the actual website as a child SWF. In the website SWF, the child SWF, will MovieClip(root) still work and refer to it's own root, or the PreLoader's root? And would I still access the websitite's document class (the child's document class), through MovieClip(root)? What if both files have a document class?So my main question is how do document classes and MovieClip(root) behave in the scenario when you have:
Parent SWF - document class, MovieClip(root)
|
Child SWF (loaded by parent) - document class, MovieClip(root)
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Feb 10, 2005
i've got an inheritance chain of AS2 classes set up where i have an array in the 'child' class that i'd like to be able to access from the 'parent' class:
bottomClass.as -'parent'
topClass.as -'child'
my question/dilemma is: how can the parent access the properties of a child class...is this even possible, or am i just looking at it wrong?
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Feb 10, 2005
i've got an inheritance chain of AS2 classes set up where i have an array in the 'child' class that i'd like to be able to access from the 'parent' class:
bottomClass.as -'parent'
topClass.as -'child'
my question/dilemma is: how can the parent access the properties of a child class...is this even possible,
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May 16, 2010
I have one movieclip object with a custom class.
That class has a loop that creates / instantiates a number of copies of another movieclip from the library. This second movieclip has a textfield child in it. When I convert this textfield to a movieclip I can access the properties of it fine, but just as a dynamic textbox I can't access it.
This is the custom class of the second movieclip that gets instatiated a few times by the first custom class...
This custom class relates to a movieclip that has a child MC called recent_text (which I can access ok) and in that child is another child (a dynamic text field called "aDynamicTextBox", which I can't access)[code]...
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Apr 20, 2009
I have a child class that is loaded into the parent class when the swf begins, like so: var myvar = 'hello'; public function Parent() { this.child = new Child(); }; How can I retrieve the variable 'myvar' from within child?
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Dec 1, 2011
I'm trying to call a function in one child class (Circle.as) from another child class (Wedge.as). Circle.as is instantiated by the document class (Tree.as), and Wedge.as is instantiated by Circle.as. How do I do this? This is my code:
Tree.as
package com.treediagram
{
public class Tree extends MovieClip
{
[code]....
How to call a function in a Class from another Class?but it was a bit hard to follow as it relates to my problem. One of the solutions worked, but was commented as being bad form, and another did not work, so I want to make sure I structure my code properly.
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Dec 14, 2010
I am dispatching an event from one document class and listening for it via another document class.My code in class A.
Code:
this.dispatchEvent(new MYEvent(MyEvent.APERTURE_DONE));
trace("Dispatching APERTURE_DONE");
my code in class B.
Code:
addEventListener(MyEvent.APERTURE_DONE, onDoorsOpen,true);
trace("Lisetning for APERTURE_DONE");
[code]....
My listener is registering before the event is dispatched, based on my output window, however I never get the "Open Doors" trace statement to fire.
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May 14, 2009
I'm creating a tree menu, and when you click a parent, it populates a MC inside that parent - children that you can also click on. The parent is a chapter and the child is a screen.clicking on the parent closes the children. clicking on the children should load a screen. But instead, when I click on a child, it acts as if I'm clicking on the parent.[code]
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Feb 2, 2010
I have a main class which listens for an event dispatched from another class say class A. Also there are other classes say class B, class C etc.There is a controller class.Classes B, C dispatches events that gets listened by the controller and works well.But the events dispatched by the Class A doesn't get listened by the main class.What might be the problem. Detailed Explanation of the problem.There is a main mxml file.
Class files are in:
ProcessInput.as
DBController.as
ShortMemDB.as ....etc
The main mxml file gets the input from a textArea. Sends the input to the capturedInput (input:String) function using set method which is in the ProcessInput Class.Now I need to dispatch events NORMAL, COMMAND depending on the input obtained after the processing, where I'm having problems. The reason is that if the event NORMAL is dispatched a particular function inside the DBController is to be called. If COMMAND event is dispatched then I need to call another function. This idea doesn't work since the events doesn't get listened.But the events dispatched by the CSDB class when listened by the DBController works well.
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