ActionScript 3.0 :: When To Use Delegate/ Dispatcher/ Listener
Jan 29, 2011
I have a ColorPicker Component and I want to (on its CHANGE EVENT) have the LISTENER OBJECT ( known as A) change ANOTHER OBJECT's (known as B) color, based on the ColorPicker's.selectedColor. I do this because i need OBJECT A to keep track of the colors used. Also OBJECT B is dynamic and its instance is based on USER INTERACTION thus B can equal B1 or B2 or C based on mouse click at any given time but must only be 1 at any given time. SO I'm trying to "chain" the events together using listeners/ or delegation but I'm not sure at the logic.how do i reference the objects in the event? should I just try to chain B to listen directly to the event? How can I do this without having to attach listers to the colorpicker every time?
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Jul 29, 2009
I'm having an issue with an event dispatcher and an event listener. Here is the application code...
Code:
Select allpackage {
import flash.display.MovieClip;
import flash.events.*;
import flash.net.URLVariables;
import SendAndLoad;
public class Test extends MovieClip {
[Code] .....
It will trace the loader.data variables but doesn't dispatch the event to the main application (Test). I'm listening for the event on the stage of the main but it doesn't trigger the event to display that the login has been successful even though it traces from the sendAndLoad class...
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Feb 4, 2009
I've built a custom event dispatcher:
Code: Select allpackage com.tests{
import flash.events.EventDispatcher;
import flash.events.Event;
[Code].....
The event traces out that it successfully fired, but the listener doesn't catch it...
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Feb 16, 2007
What is the advantage of using a Delegate class in as2? I realize that it's old news for as3 guys. But Ive got a medium sized as2 project and Im going through my code and wondering why Im using Delegate.create sometimes. What's wrong with "apply"?I admit that I must have jumped on the Delegate bandwagon without thinking anything more than "dhuu...thats what the pros must be using".Am I right in saying that there is nothing at all wrong with simply saying "function_name.apply( this, args )"? Or am I missing something? Is it a matter of memory management? I've done a lot of research on delegation and read all kinds of blogs and scripts from little tweeks to the official.. to >200 lines. Yikes! At the end of the day I wrote my own little delegate class that worked for me (just a rewrite of Proxy without loops). But now that I go though my code I see that I might as well have just used apply because that's all Im doing with it!
Id like to be a better programmer. What am I missing and why shouldn't I do a find and replace here. Why is it better to wrap up "apply"? Will I be better readied to learn other languages?I just don't understand why I was so convinced that I needed the delegate class when I had "apply" out of the box.
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Oct 30, 2007
I'm having trouble using the delegate.create method (my first time using it!). Here's part of a class I have...
Code:
public function SiteData(xmlFile:String) {
imagesXML = new XML();
[code]....
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Sep 29, 2009
I'm having a hard time understanding to use the Delegate class. I don't seem to understand what it does from what I read online.
Will it work for this situation? I want to rollover a menu that expands onRollover. You can then click on buttons within the rolled over portion. Is delegate for me?
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Dec 8, 2009
I've got records being populated into our database from paypal's Instant payment notification methods...great. now i turn to our flash cs3 app to populate a component datagrid with the stored database data and to my surprise I'm unable to identify any examples on how this might even be done.
How do you connect to an mssql database from within flash cs3 to retrieve data for displaying within a flash datagrid?
I can write a cfc from coldfusion to return a dataset, but overall i'm not sure if i 'have' to learn Flex, or AIR or what to get the records 'read'.
My ActionScript 3.0 bible is vague at best and resorts to php. (which i dont know)
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Oct 1, 2010
i have a situation like that, and my goal is to access from onRelease either to the class representation and to the onRelease callee (the caller of the release function,that is the movieclip that catch the onRelease event):[code]
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Aug 14, 2007
when i'm coding directly on the timeline, i usually create a var like this:
Code:
var home:MovieClip = this;
so i always have something to reference the main timeline's scope. how could i do this in a class? delegate.create gets a little confusing.
i tried a few things like the following:
Code:
class com.myClass
{
public var className:String = "myClass";
public static var version:String = "0.0.1";
[code]...
of course this is redundant because it'll scope just fine as parseNews();, but i'm just wondering why it's letting me scope it like this here and not in the onLoad declaration?
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Sep 16, 2009
I am using a delegate sub-class to perform helper functions for the main app.I have passed all references to it that it needs and it works well apart from the following problem:I also want it to remove an event listener from the main pp.eg:thisStage.removeEventListener(MouseEvent.MOUSE_UP,preOutsideBoundsDragRelease);The compiler tells me I need a reference to "preOutsideBoundsDragRelease" within the removeEventListener statement.eg: "access of undefined property preOutsideBoundsDragRelease
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Dec 4, 2009
i instantiate a sprite-class "panel" from my main class. then i call a function "show chooser" inside "panel" which instatiates a sprite class "chooser" with some buttons. now when one of the buttons is pressed i need to call a function inside "panel" which removes the "chooser" sprite/class and which calls a function "onChosen" in the main class.
what is the correct/best way to reference these functions so that they can be called from within the panel and/or chooser classes. i am still too much in the old thinking that a function belongs to a movieclip and can functions with _parent. i need to learn the proper way now.
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Mar 26, 2012
I have a sendAndLoad going on in a separate class file and following guides online I've used a Delegate to handle the onLoad part, like this [code]...
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Oct 25, 2005
How can I get around using an instance variable in a static function that must be called by the Delegate method?
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Jan 13, 2010
I have two movieclips: MovieClip X and MovieClip Y.
MovieClip Y is nested inside of MovieClip X. MovieClip Y contains buttons with listeners attached to them. These listeners call a method
Code:
buttonClickedHandler();
inside of buttonClickedHandler();... dispatchEvent() is called to dispatch a custom event that bubbles up to MovieClip X. This chain of events works as intended, I can set up a listener in MovieClip X for the custom event and everything is fine...
The problem comes when I try to invoke a dispatch on a button in MovieClip Y without actually physically clicking it. If i call
Code:
ButtonA.dispatchEvent(new MouseEvent(MouseEvent.click));
the listener for the button click event will fire properly, and if i trace the dispatchEvent of the custom event, it returns true meaning the event was dispatched successfully. But in MovieClip X... the listener for that custom event is never fired, its as if the custom even is not bubbling.
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Jan 22, 2009
Ok I have 3 classes as an example. Main.as
AutoSlide.as
ControlPac
Main looks like this.
Code:
package com {
import flash.display.Sprite;
import flash.events.Event;[code]....
But I also though other objects could be setup to listen for an event that has been dispatched. This is why I put a listener on ControlPac
Code:
controlPac.addEventListener(AutoSlide.CALL_SLIDE, callNextSlide);
But its not hearing the dispatched event. I tried to extend ControlPac as an evnt and also as a Sprite but its still not able to receive dispatched events from another object
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Oct 15, 2011
I need to separate the visual part of a component from the functional part of a component, so that I'm able to replace the visual one with a new one for another platform.
Declaring an instance variable _delegate with the delegate's interface isn't a problem. But how Do I forward non-implemented method calls of the visual part to those of the delegate.
What's the equivalent of PHP's _call()?
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Jan 31, 2008
I am wanted to know how can i pass a parameter to the function which I'm calling using Delegate class. I know to pass params having static values such as true / false or a static string "hello".
Code:
var myFunc:Function = btn.onRelease = Delegate.create(tihs, releaseHandler);
myFunc.str = "hello";
function releaseHandler()
[code]....
Here str can be retrieved as 'arguments.caller.str' inside the function.But in case i want to pass the reference of the 'btn' button. Then how can i do this ?
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Jul 10, 2009
How do i create a trace that can detect if an event dispatcher is dispatching an event?....my problem is i've created a custom event that is not being dispatched i use this custom event in other applications and have verified that the code is correct I'm not getting any errors neither it just dies silently
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Apr 11, 2010
I was studying about EventDispatcher and tried to make my own class and interface IEventDispatcher.Then later i was wondering, what use does the interface have anyway when you still have to declare the functions that are in the interface to the class that implements the interface? The dispatcher will still work without the interface. Like addEventListener, removeEventListener, these functions are within EventDispatcher so why do i need an IEventDispatcher?
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Dec 7, 2009
I need to pass a variable in dispatcher tag... for instance
[Code]....
Now how can i pass the user in the mate dispatcher tag.
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Jan 3, 2011
there are 2 functions in my code that dispatch a TweenEvent. each function dispatches the same tween and adds the same TweenEvent.MOTION_FINISH event listener. however, the event listening function must act according to which function dispatched the event. is it possible to get the function of the event dispatcher from the event listener? i could use a flag to make this work if there are no other elegant solutions.
[Code]....
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Sep 9, 2009
I created a class that extends the displayObject3d and added an Event dispatcher like bellow:
Code:
package {
import flash.display.Sprite;
import flash.display.Stage;
import flash.events.Event;
[code]....
but unfortunately the event never dispatches.
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Dec 1, 2010
I have been having an issue that I can't seem to solve, I have been fumbling with it most of the day. I am tying to dispatch a custom event in one class and listen for it in another. Here is how my app is built. I have a main swf that loads another swf called LoadingDoors into it. In my LoadingDoors Document class I dispatch a listener:
private function timerListener(event:TimerEvent):void
{
if(doorsMC.currentFrameLabel == "Closed")
[code].....
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Nov 5, 2011
If I have an event listener which picks up an event, how can I remove the event dispatcher? I would be looking for something like this.
Code:
addEventListener(MouseEvent.CLICK, onClick, true);
function onClick(event:MouseEvent):void
{
event.target = null;
}
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Aug 24, 2006
I'm using Delegates in a new project I'm working on to call an event handler in my class with the scope of the class.
I'm having an issue referencing which button is calling this handler. Since all of my buttons are created dynamicly, this is a big problem.
I'm used to using forms and components where I had no problem with this and could reference who was calling the event handler by using - event.target
This doesn't seem to be the case with movieclips though, is there another way to do this?
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Jan 31, 2008
I've written a class that will load multiple SWFs and then call a passed function when complete. My problem is that when all the movies have downloaded the passed function won't fire.
[AS]
// LoadChecker
// this class is passed am array and calls a function when all of the objects in the array are loaded
//
[code]....
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May 14, 2010
I've a parent (Canvas) with many children (LinkButtons)The linkButtons trigger an event to communicate between them:[code]Now, the issue is that the event is only listened by the dispatcher child. In other words, only the child triggering the event, is receiving it. I was wondering what's wrong with it, and if I should add a listener to the parent (Canvas)I basically need the children (LinkButton) communicate between them
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Dec 14, 2009
I'm still getting confused with the whole event dispatching feature...all I need to do is fire a single event from a child swf to it's parent in as2..
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Apr 25, 2006
I've tried to make an XML parser class using ASBroadcaster, that would act as a listener, and then have methods like getNode(n), which when called, would return the value of that node as a string to the dispatcher/caller.
This doesn't really work all that well, since I'm unsure of how to adress the dispatcher/caller in an economic way.
Do I have to supply the caller object as an argument when broadcasting from it, then do another broadcast for setNode inside the XMLParser.getNode method, supplying it as an argument again, and then check with an if statement in the setNode of the caller, whether it is the right one or not. Seems a bit over the top.
I'd want XMLParser to be a centralised class, that all other objects would refer to via some listener or get/set thing, instead of having an instance of it in each of the objects that would use it.
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Jun 22, 2011
I have a GlobalDispatcher Singleton class extending EventDispatcher that can be accessed through a static getInstance () method by any class after the constructor has been called. i have a host movie that calls the GlobalDispatcher constructor and sets up a listener for a custom event. This host movie then dynamically loads in a different external movie (in the same domain as the host). This movie calls the getInstance method to get the instance of the GlobalDispatcher. Then after an animation it has the GlobalDispatcher dispatch the same custom event the host is set to listen to. The host then captures the event dispatched by the dynamically loaded movie.
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