[flexcoders] Re: Custom event--please help me
--- In flexcoders@yahoogroups.com, Josh McDonald dzn...@... wrote: Don't call new EventDispatcher(), it won't be any real use. The main reason you would want to create an instance of EventDispatcher itself is when you're building a class that is an IEventDispatcher, but inherits from a base class that is not an IEventDispatcher, because we don't have multiple inheritance in AS3. When you do that, you need to use something like: private var myEventDispatcher : IEventDispatcher = new EventDispatcher(this); My experience with this is that occasionally that will run before the constructor and you'll get an error--it seems to be safer to put the assignment statement inside the constructor, even though it makes it a PIA to have boilerplate IEventDispatcher code that you copy in when you want to add event dispatching.
Re: [flexcoders] Re: Custom event--please help me
Well yeah, I don't actually instantiate it like that (as it will always run before the constructor), I was just showing an example. I have the whole lot in a .inc file and include it: http://pastie.textmate.org/340790 -Josh On Wed, Dec 17, 2008 at 12:17 AM, Amy amyblankens...@bellsouth.net wrote: --- In flexcoders@yahoogroups.com, Josh McDonald dzn...@... wrote: Don't call new EventDispatcher(), it won't be any real use. The main reason you would want to create an instance of EventDispatcher itself is when you're building a class that is an IEventDispatcher, but inherits from a base class that is not an IEventDispatcher, because we don't have multiple inheritance in AS3. When you do that, you need to use something like: private var myEventDispatcher : IEventDispatcher = new EventDispatcher(this); My experience with this is that occasionally that will run before the constructor and you'll get an error--it seems to be safer to put the assignment statement inside the constructor, even though it makes it a PIA to have boilerplate IEventDispatcher code that you copy in when you want to add event dispatching. -- Flexcoders Mailing List FAQ: http://groups.yahoo.com/group/flexcoders/files/flexcodersFAQ.txt Alternative FAQ location: https://share.acrobat.com/adc/document.do?docid=942dbdc8-e469-446f-b4cf-1e62079f6847 Search Archives: http://www.mail-archive.com/flexcoders%40yahoogroups.comYahoo! Groups Links -- Therefore, send not to know For whom the bell tolls. It tolls for thee. Like the cut of my jib? Check out my Flex blog! :: Josh 'G-Funk' McDonald :: 0437 221 380 :: j...@gfunk007.com :: http://flex.joshmcdonald.info/ :: http://twitter.com/sophistifunk
[flexcoders] Re: Custom event--please help me
BasePanel uses another EventDispatcher instance which is inherit from
UIComponent.
So U can try
var basePanel:BasePanel = your BasePanel instance;
basePanel.dispatchEvent(ev);
instead
var dipsatcher:EventDispatcher = new EventDispatcher();
dispatcher.dispatchEvent(ev);
And U should have a look at;
http://tech.groups.yahoo.com/group/flexcoders/message/66101
http://www.helihobby.com/html/alon_desingpattern.html
also CairngormEventDispatcher
--- In flexcoders@yahoogroups.com, lorenzo.boaro lore...@...
wrote:
Hi
i've a problem..anibody can help me?
i created this class:
public class CompleteEvent extends Event
{
private var array:ArrayCollection
public function CompleteEvent(type:String,
array:ArrayCollection)
{
super(type);
this.array = array;
}
public override function clone():Event {
return new CompleteEvent(type, array);
}
}
the main class create the array through a socket connection within
the
socket listeners for Socket.DATA...in the method listeners dispatch
the event...
[Event(name=newEvent, type=CompleteEvent)]
public class MainApp{
socket.addEventListeners(ProgressEvent.SOCKET_DATA, socketData);
...
private function socketData(event:Event):void {
...some code to create array from server data...
//dispatch event
var dipsatcher:EventDispatcher = new EventDispatcher();
var ev:CompleteEvent = new CompleteEvent(newEvent, array);
dispatcher.dispatchEvent(ev);
}
}
and this other class listens for the event
public class BasePanel extends Panel
{
private function dataEventHandler():void {
trace(Array retrieved);
}
public function BasePanel()
{
super();
this.addEventListener(newEvent,
dataEventHandler);
}
}
but not working the BasePanel class doesn't listen for the event..
thanks a lot
Regards
Lorenzo
Re: [flexcoders] Re: Custom event--please help me
Don't call new EventDispatcher(), it won't be any real use. The main
reason you would want to create an instance of EventDispatcher itself is
when you're building a class that is an IEventDispatcher, but inherits from
a base class that is not an IEventDispatcher, because we don't have multiple
inheritance in AS3. When you do that, you need to use something like:
private var myEventDispatcher : IEventDispatcher = new
EventDispatcher(this);
and then you proxy all your implementations of IEventDispatcher methods to
use that, ie:
public function dispatchEvent(event:Event):Boolean
{
return myEventDispatcher.dispatchEvent(event);
}
But the important part is that you create it with the (this) parameter so
the internal stuff knows who is actually the dispatcher of the event in
question, which is important in order to perform the bubble and capture
stages. Without it, nobody will ever be able to catch the events without
having a reference to the instance of EventDispatcher that you create, as it
will have no ties to the object that created it, and it cannot be added to
the display list.
-Josh
On Mon, Dec 15, 2008 at 10:38 PM, nathanleewei nathanlee...@yahoo.comwrote:
BasePanel uses another EventDispatcher instance which is inherit from
UIComponent.
So U can try
var basePanel:BasePanel = your BasePanel instance;
basePanel.dispatchEvent(ev);
instead
var dipsatcher:EventDispatcher = new EventDispatcher();
dispatcher.dispatchEvent(ev);
And U should have a look at;
http://tech.groups.yahoo.com/group/flexcoders/message/66101
http://www.helihobby.com/html/alon_desingpattern.html
also CairngormEventDispatcher
--- In flexcoders@yahoogroups.com, lorenzo.boaro lore...@...
wrote:
Hi
i've a problem..anibody can help me?
i created this class:
public class CompleteEvent extends Event
{
private var array:ArrayCollection
public function CompleteEvent(type:String,
array:ArrayCollection)
{
super(type);
this.array = array;
}
public override function clone():Event {
return new CompleteEvent(type, array);
}
}
the main class create the array through a socket connection within
the
socket listeners for Socket.DATA...in the method listeners dispatch
the event...
[Event(name=newEvent, type=CompleteEvent)]
public class MainApp{
socket.addEventListeners(ProgressEvent.SOCKET_DATA, socketData);
...
private function socketData(event:Event):void {
...some code to create array from server data...
//dispatch event
var dipsatcher:EventDispatcher = new EventDispatcher();
var ev:CompleteEvent = new CompleteEvent(newEvent, array);
dispatcher.dispatchEvent(ev);
}
}
and this other class listens for the event
public class BasePanel extends Panel
{
private function dataEventHandler():void {
trace(Array retrieved);
}
public function BasePanel()
{
super();
this.addEventListener(newEvent,
dataEventHandler);
}
}
but not working the BasePanel class doesn't listen for the event..
thanks a lot
Regards
Lorenzo
--
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Links
--
Therefore, send not to know For whom the bell tolls. It tolls for thee.
Like the cut of my jib? Check out my Flex blog!
:: Josh 'G-Funk' McDonald
:: 0437 221 380 :: j...@gfunk007.com
:: http://flex.joshmcdonald.info/
:: http://twitter.com/sophistifunk
