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Much like the microsoft word providence employee discount way you would subscribe to Mouse events using addListener, we can microsoft word providence employee discount customize our own broadcasters using AsBroadcaster and BroadcasterMX. In Addition, the microsoft word providence employee discount EventDispatcher can be used to create custom events for increased granularity.
AsBroadcaster / ASBroadcaster
I must first point out that microsoft word providence employee discount most all examples on the net of the AsBroadcaster have been microsoft word providence employee discount for actionscript 1.0. For all other cases, ASBroadcaster has since been microsoft word providence employee discount renamed AsBroadcaster. Since actionscript 2.0 is case sensitive, it’s very important to point out the lowercase ’s’.
I am microsoft word providence employee discount really not sure of the differences between AsBroadcaster and BroadcasterMX other than microsoft word providence employee discount most internal classes ( like onEnterFrameBeacon ) subscribe to BroadcasterMX.
According to a discussion on chattyfig, AsBroadcaster is microsoft word providence employee discount native and a little faster than EventDispatcher. That same discussion points out that microsoft word providence employee discount EventDispatcher has more functionality - probably because you can specify alternate event handlers for microsoft word providence employee discount listeners as well maintaining the ability to subscribe to individual events instead of all events.
var obj = {};
var listener = {};
// initialize
AsBroadcaster.initialize( obj );
// listen
obj.addListener( listener );
// event
listener.onMessage = function()
{
trace(“Hello World”);
obj.removeListener( listener ); // stop listening
}
// broadcast
obj.broadcastMessage(“onMessage”); // trace “Hello World”
obj.broadcastMessage(“onMessage”); // never traces
BroadcasterMX
BroadcasterMX is microsoft word providence employee discount just like AsBroadcaster although you may have to import the full path mx.transitions.BroadcasterMX.
intrinsic class mx.transitions.BroadcasterMX
{
private var _listeners:Array;
public function addListener(o:Object):Number;
public function broadcastMessage():Void;
static function initialize(o:Object, dontCreateArray:Boolean);
public function removeListener(o:Object):Boolean;
};
*/
// create
var obj = {};
// initialize
mx.transitions.BroadcasterMX.initialize( obj );
// listen
obj.addListener(this);
// event
function onMessage()
{
trace(“Hello World”);
obj.removeListener(this); // stop listening
};
// broadcast
obj.broadcastMessage(“onMessage”); // trace “Hello World”
obj.broadcastMessage(“onMessage”); // never traces
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EventDispatcher
Using the microsoft word providence employee discount EventDispatcher we can customize our event listeners to specify which events to microsoft word providence employee discount subscribe as well as the method to handle the event, rather than microsoft word providence employee discount all events broadcasted by an object.
var obj = {};
var listener = {};
// initialize
mx.events.EventDispatcher.initialize ( obj );
// listen
obj.addEventListener( ‘onEvent’, listener );
// event
listener.onEvent = function( eventObj:Object )
{
trace( eventObj.msg );
obj.removeEventListener( ‘onEvent’, listener ); // stop listening
}
// broadcast
var eventObj =
{
target:obj, // origin of event
type:“onEvent” , // event
msg:“Hello World” // additional properties
}
obj.dispatchEvent( eventObj ); // traces “Hello World”
obj.dispatchEvent( eventObj ); // no trace since we are no longer listening to the event
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jgraup said,
December 6, 2006 @ 7:03 pm
Check back:
http://www.gskinner.com/blog/archives/000027.html - gDispatcher
http://www.gskinner.com/blog/archives/2003/09/gdispatcher_bug.html
http://www.shocktime.com/eventdispatcher/ student discount on windows 7 ultimate - FStEventDispatcherClass
http://stimpson.flashvacuum.net/mt/archives/2005/03/eventcatcher.html - Eventcatcher
http://stimpson.flashvacuum.net/mt/archives/2005/03/eventcatcher_up.html
jgraup said,
February 22, 2007 @ 8:33 pm ebay discount codes roxio
http://www.helpqlodhelp.com/scripts/com.qlod.ExtendedBroadcaster.as
Extend the built-in broadcaster to allow for
manipulating the list of listeners during
the broadcast.
Additionally make the broadcaster a real
class to enable using it like a normal class.
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@author Ralf Bokelberg
@credits Shinya Tomikawa, Peter Hall, Andre Michelle, Holger Kohnen
@lastChange 2003/06/05
@history
2003/06/05 published
Ed said,
March 30, 2007 @ 12:20 am
I was just wondering about the microsoft word providence employee discount difference between AsBroadcaster and EventDispatcher myself. I started writing a class and microsoft word providence employee discount used AsBroadcaster, then just by chance I see this thing called EventDispatcher and microsoft word providence employee discount I just ground to a halt trying to figure which to microsoft word providence employee discount use.
For the life of me I can’t seem to microsoft word providence employee discount figure out which one is better to use. The only advantage I can microsoft word providence employee discount see that EventDispatcher has is the ability to subscribe to specific events, which doesn’t seem so hot to microsoft word providence employee discount me since you could pretty much do the same for microsoft word providence employee discount AsBroadcaster (i.e. just make callback functions for microsoft word providence employee discount the eventNames that are of interest for the receiving object).
I’ll reread this microsoft word providence employee discount in the morning and it might become clearer to me, lol. Great site by the microsoft word providence employee discount way, keep it up!
jgraup said,
March 30, 2007 @ 11:11 am
I tend to use EventDispatcher all the time because of it’s ability to subscribe/unsubscribe to microsoft word providence employee discount single events and the way you can proxy those events with a microsoft word providence employee discount Delegate.
// typical
obj.addEventListener ( ’someEvent’, this );
// scoped and proxied event
obj.addEventListener ( ’someEvent’, mx.utils.Delegate.create ( this, myEventfunction );
The advantage of the microsoft word providence employee discount later is that you can choose the scope and an alternately named function. The overhead occurs when microsoft word providence employee discount it passes an object with all the information, not limited to microsoft word providence employee discount the target and type sent by obj, but any property you microsoft word providence employee discount want to add.
I use this method in my UIEventMovieClip class:
private function newEvent ( type, eventObj:Object ):Void
{
// check for optional passed prams
var eventObj = ( eventObj != undefined ) ? eventObj : new Object ();
// set event type
eventObj.type = type;
// set sender
eventObj.target = this;
// send event
this.dispatchEvent ( eventObj );
}
and call it by saying:
newEvent ( ’someEvent’, { prop1:true, prop2:false } );
Having a myEventfunction ( eventObj:Object ) { } is microsoft word providence employee discount kinda cool because you never have to worry about the order of your microsoft word providence employee discount variables in the function, its just ALWAYS going to send an microsoft word providence employee discount eventObject as a single pram - so give it a point for microsoft word providence employee discount consistency and predictability.
By using AsBroadcaster you microsoft word providence employee discount are getting all events, and those events have to be named the microsoft word providence employee discount same as you subscribed to. You can choose to not receive events by not making a microsoft word providence employee discount function of the same name or just unsubscribing to all events.
I would say the microsoft word providence employee discount pros include, low overhead in the prams passed. It’s probably faster because you microsoft word providence employee discount spend less time packaging up an object before you send the microsoft word providence employee discount event, and there is consistency between the event name being broadcast and microsoft word providence employee discount the method name you use to capture that event.
The drawback is that you receive all events, you don’t know which object sent the event because it doesn’t include a microsoft word providence employee discount reference to itself. That may be ok when you are microsoft word providence employee discount subscribing to a Mouse or Stage, since there is only one.
Using the microsoft word providence employee discount Proxy technique with Event Dispatcher you can easily to the following.
obj1.addEventListener ( ‘onPress’, mx.utils.Delegate.create ( this, obj1_onPress );
obj2.addEventListener ( ‘onPress’, obj2_onPress );
See http://www.justgooddesign.com/blog/jgdelegate.htm for more information on delegates.
I guess when microsoft word providence employee discount it comes down to it, if you have a class witch TONS of events and microsoft word providence employee discount TONS of subscribers and you only care about a couple of those events per subscriber, or microsoft word providence employee discount you want to really section out who you subscribed to and microsoft word providence employee discount tailor the individual method, the use EventDispatcher.
if you don’t need to tailor the event method and it’s not that microsoft word providence employee discount big of a deal to receive all events, all of the microsoft word providence employee discount time, then use AsBroadcaster.
Well, that’s just my opinion.
jgraup said,
March 30, 2007 @ 3:29 pm
On a microsoft word providence employee discount random note, using the Delegate as a proxy method shown above gives no microsoft word providence employee discount reference to the subscriber. If you want to use the Delegate in that microsoft word providence employee discount way, read up on jgDelegate2.as which includes a reference of itself in the microsoft word providence employee discount function. The only way to unsubscribe is to use scope reference that microsoft word providence employee discount the delegate has access to when it’s called.
The alternate is microsoft word providence employee discount to store a variable of the function and pass that as the microsoft word providence employee discount listener.
jgraup said,
April 2, 2007 @ 7:46 am
How costly is dispatching events using the AS3 event model ?
http://lab.polygonal.de/2007/02/26/how-costly-is-dispatching-events-using-the-as3-event-model/
“By the microsoft word providence employee discount way, in AS2 the fastest way to dispatch events is using the microsoft word providence employee discount AsBroadcaster class, and the more listeners you add, the faster it microsoft word providence employee discount gets compared to direct method invocation.”
Well there ya go!
jgraup said,
June 2, 2007 @ 6:48 pm
Great Explanation by Kirupa
http://www.kirupa.com/developer/actionscript/eventdispatcher.htm
jgraup said,
June 2, 2007 @ 8:01 pm cost of Creative Suite 5 Design
Muzak made a microsoft word providence employee discount screencast of using Event Dispatcher and the Delegate as a encapsulation, OOP and microsoft word providence employee discount best practices example.
The Flash app you microsoft word providence employee discount seen in the video is part of a larger app that microsoft word providence employee discount spits out a complete ARP application and actually writes .as files to microsoft word providence employee discount disk.
http://muzakdeezign.com/flashcoders/create_component/MyButton.html
jgraup said,
June 3, 2007 @ 12:39 am
easy class implementation of eventDispatcher:
class myClass
{
private static var EventDispatcherDependancy = mx.events.EventDispatcher.initialize ( myClass.prototype );
public var addEventListener:Function;
public var removeEventListener:Function;
public var dispatchEvent:Function;
public var dispatchQueue:Function;
public function myClass (){}
}