Re: [flexcoders] Dispatching an Event from a Class
Hey Mike,
If I've understood the previous mails correctly you wish to implement
IEventDispatcher in a class that already derives from another? (i.e. your
ModelLocator).
If this is the case, then in your class that implement IEventDispatcher you
want to create an instance of EventDispatcher, for example:
package com.dts_workshop.flexcoders.eventDispatcher
{
import flash.events.Event;
import flash.events.IEventDispatcher;
import flash.events.EventDispatcher;
public class CustomEventDispatcher extends SomeOtherClass implements
IEventDispatcher
{
private var _dispatcher : EventDispatcher;
public function CustomEventDispatcher() {
_dispatcher = new EventDispatcher(this);
}
public function dispatchEvent(event:Event):Boolean
{
return _dispatcher.dispatchEvent(event);
}
// Rest of implementation
}
EventDispatcher allows you to create an instance of it, passing in the class
that implements IEventDispatcher but cannot derive from EventDispatcher. Any
events raised will have the correct target.
For more information, take a look at the info for EventDispatcher in the
Flex 2 help.
Regards,
Oliver Tupman.
I hope that's what you're after.
Re: [flexcoders] Dispatching an Event from a Class
Just call dispatchEvent() (e. g. dispatchEvent(new Event(Event.CHANGE))) in
any class that implements IEventDispatcher (e. g. all the EventDispatcher
successors). Note, that UIComponent and all its successors implement
IEventDispatcher, so dispatchEvent() could be called in any subclass of Box,
ComboBox, Label, TextArea, HSlider, etc:
package {
import mx.controls.HSlider;
public class MyHSlider extends HSlider {
public function MyHSlider() {
super();
dispatchEvent(new Event(instanceConstructed));
}
}
}
On 1/9/07, Mike Anderson [EMAIL PROTECTED] wrote:
Hello All,
I am attempting to dispatch an Event from a generic Class File, and I
guess I'm not doing it correctly.
I was hoping, that I could simply do this:
import mx.events.IEventDispatcher
And then in my function, I could simply dispatch the event like this:
IEventDispatcher.dispatchEvent( event );
But it doesn't allow me to do this. In the meantime, I extended my
Class to use the UIComponent, which automatically pulls in all the
EventDispatcher stuff. Of course, it's silly for me to do this, since I
really don't have a need to extend the UIComponent class.
There must be a way, to import the proper Class, in order to simply
dispatch events.
Any advice?
Thanks in advance for your help,
Mike
RE: [flexcoders] Dispatching an Event from a Class
And even that is not necessary, but I'm not sure exactly what is. I'm
dispatching events from a class that only implements IMXMLObject. I
recall reading that if you have a [Bindable] metedata tag on the class,
that Flex automatically generates the EventDispatcher code.
Its in the docs somewhere.
Tracy
From: flexcoders@yahoogroups.com [mailto:[EMAIL PROTECTED] On
Behalf Of Sergey Kovalyov
Sent: Tuesday, January 09, 2007 2:28 PM
To: flexcoders@yahoogroups.com
Subject: Re: [flexcoders] Dispatching an Event from a Class
Just call dispatchEvent() (e. g. dispatchEvent(new Event(Event.CHANGE)))
in any class that implements IEventDispatcher (e. g. all the
EventDispatcher successors). Note, that UIComponent and all its
successors implement IEventDispatcher, so dispatchEvent() could be
called in any subclass of Box, ComboBox, Label, TextArea, HSlider, etc:
package {
import mx.controls.HSlider;
public class MyHSlider extends HSlider {
public function MyHSlider() {
super();
dispatchEvent(new Event(instanceConstructed));
}
}
}
On 1/9/07, Mike Anderson [EMAIL PROTECTED] mailto:[EMAIL PROTECTED]
wrote:
Hello All,
I am attempting to dispatch an Event from a generic Class File, and I
guess I'm not doing it correctly.
I was hoping, that I could simply do this:
import mx.events.IEventDispatcher
And then in my function, I could simply dispatch the event like this:
IEventDispatcher.dispatchEvent( event );
But it doesn't allow me to do this. In the meantime, I extended my
Class to use the UIComponent, which automatically pulls in all the
EventDispatcher stuff. Of course, it's silly for me to do this, since I
really don't have a need to extend the UIComponent class.
There must be a way, to import the proper Class, in order to simply
dispatch events.
Any advice?
Thanks in advance for your help,
Mike
RE: [flexcoders] Dispatching an Event from a Class
Yes, I understand this -
But what about a generic class, that does NOT extend any other classes
(which have the IEventDispatcher as part of their makeup)
In my generic class (in this case, my ModelLocater which is part of a
Cairngorm-based application), it doesn't natively have anything in there
which includes the EventDispatcher stuff.
So, I wanted to see what the bare minimum requirements would be, in
order to Dispatch an Event from a Class File that doesn't extend or
implement anything else.
Also, I DO have the [Bindable] Metatag on this class, and even know I
don't get any code-hinting whenever I type any dispatchEvent type
code, I don't get any Compiler Errors either... That struck me as odd,
but with what Tracy just mentioned, it does answer a few questions...
So I guess, the [Bindable] Metatag is a quick way to add this
functionality, but I am just curious if I wanted to accomplish this via
some other means.
Thanks for the info on this topic :)
Mike
From: flexcoders@yahoogroups.com [mailto:[EMAIL PROTECTED] On
Behalf Of Sergey Kovalyov
Sent: Tuesday, January 09, 2007 1:28 PM
To: flexcoders@yahoogroups.com
Subject: Re: [flexcoders] Dispatching an Event from a Class
Just call dispatchEvent() (e. g. dispatchEvent(new Event(Event.CHANGE)))
in any class that implements IEventDispatcher (e. g. all the
EventDispatcher successors). Note, that UIComponent and all its
successors implement IEventDispatcher, so dispatchEvent() could be
called in any subclass of Box, ComboBox, Label, TextArea, HSlider, etc:
package {
import mx.controls.HSlider;
public class MyHSlider extends HSlider {
public function MyHSlider() {
super();
dispatchEvent(new Event(instanceConstructed));
}
}
}
On 1/9/07, Mike Anderson [EMAIL PROTECTED] wrote:
Hello All,
I am attempting to dispatch an Event from a generic Class File,
and I
guess I'm not doing it correctly.
I was hoping, that I could simply do this:
import mx.events.IEventDispatcher
And then in my function, I could simply dispatch the event like
this:
IEventDispatcher.dispatchEvent( event );
But it doesn't allow me to do this. In the meantime, I extended
my
Class to use the UIComponent, which automatically pulls in all
the
EventDispatcher stuff. Of course, it's silly for me to do this,
since I
really don't have a need to extend the UIComponent class.
There must be a way, to import the proper Class, in order to
simply
dispatch events.
Any advice?
Thanks in advance for your help,
Mike
Re: [flexcoders] Dispatching an Event from a Class
Mike, I'm interested in why you would dispatch an Event from your
modelLocator? Could you please share?
Also, could this be a case where the Observe tag could help you?
http://weblogs.macromedia.com/paulw/archives/2006/05/the_worlds_smal.cfm
Thanks
Sam
On 1/9/07, Mike Anderson [EMAIL PROTECTED] wrote:
Yes, I understand this -
But what about a generic class, that does NOT extend any other classes
(which have the IEventDispatcher as part of their makeup)
In my generic class (in this case, my ModelLocater which is part of a
Cairngorm-based application), it doesn't natively have anything in there
which includes the EventDispatcher stuff.
So, I wanted to see what the bare minimum requirements would be, in order
to Dispatch an Event from a Class File that doesn't extend or implement
anything else.
Also, I DO have the [Bindable] Metatag on this class, and even know I
don't get any code-hinting whenever I type any dispatchEvent type code, I
don't get any Compiler Errors either... That struck me as odd, but with
what Tracy just mentioned, it does answer a few questions...
So I guess, the [Bindable] Metatag is a quick way to add this
functionality, but I am just curious if I wanted to accomplish this via some
other means.
Thanks for the info on this topic :)
Mike
--
*From:* flexcoders@yahoogroups.com [mailto:[EMAIL PROTECTED] *On
Behalf Of *Sergey Kovalyov
*Sent:* Tuesday, January 09, 2007 1:28 PM
*To:* flexcoders@yahoogroups.com
*Subject:* Re: [flexcoders] Dispatching an Event from a Class
Just call dispatchEvent() (e. g. dispatchEvent(new Event(Event.CHANGE)))
in any class that implements IEventDispatcher (e. g. all the EventDispatcher
successors). Note, that UIComponent and all its successors implement
IEventDispatcher, so dispatchEvent() could be called in any subclass of Box,
ComboBox, Label, TextArea, HSlider, etc:
package {
import mx.controls.HSlider;
public class MyHSlider extends HSlider {
public function MyHSlider() {
super();
dispatchEvent(new Event(instanceConstructed));
}
}
}
On 1/9/07, Mike Anderson [EMAIL PROTECTED] wrote:
Hello All,
I am attempting to dispatch an Event from a generic Class File, and I
guess I'm not doing it correctly.
I was hoping, that I could simply do this:
import mx.events.IEventDispatcher
And then in my function, I could simply dispatch the event like this:
IEventDispatcher.dispatchEvent( event );
But it doesn't allow me to do this. In the meantime, I extended my
Class to use the UIComponent, which automatically pulls in all the
EventDispatcher stuff. Of course, it's silly for me to do this, since I
really don't have a need to extend the UIComponent class.
There must be a way, to import the proper Class, in order to simply
dispatch events.
Any advice?
Thanks in advance for your help,
Mike
RE: [flexcoders] Dispatching an Event from a Class
Yes, I'd be happy to share :)
#1) I just want to know how to do it, to put my mind at ease that I can
do this if I DO ever have the need
#2) The reason it's in my modelLocater is because, my debugText variable
is held here - and I have a floating Debug Window which stays open
during the development phase of my application. In my Debug Popup
Window, I simply have a TextArea Control, in which I bind the
model.debugText variable to. Then whenever I want to perform a trace, I
just run my model.updateDebug() function, which in turn, appends any
new Debug Information, to the model.debugText variable. And voila! my
Debug Window gets updated with the debugText.
#3) Any time Text is added to a TextArea control, and the text size
exceeds the currently displayed limit, ScrollBars appear - and any
additional text added, gets placed below the visible area. With the
nature of the Text being debugging information, I am most interested in
ONLY the latest text being added - so I need to automatically scroll my
TextArea all the way to the bottom. I want within my grasp, the ability
to manually dispatch the event, which causes my TextInput Control to
scroll all the way to the bottom.
#4) I know that I could simply create an event listener for the TextArea
residing in my DebugWindow, that any time a change event occurs, to
run a function that causes the ScrollBars to move all the way to the
bottom.
So with all that said, I guess bottom line, I am asking this:
How can I write BOTH, and Event listener to listen for events, and ALSO
an Event Dispatcher to dispatch the event, whereas I can ANYWHERE inside
of my application, trigger this to happen any time I like??
I was under the impression, that Events get broadcasted Application
Wide - and that anything with an active listener running, will capture
and respond to the event. I guess I was sadly mistaken, because I am
hitting a MAJOR brick with all of this.
I would love to hear more input on this topic :)
Thanks,
Mike
From: flexcoders@yahoogroups.com [mailto:[EMAIL PROTECTED] On
Behalf Of Sam Shrefler
Sent: Tuesday, January 09, 2007 7:19 PM
To: flexcoders@yahoogroups.com
Subject: Re: [flexcoders] Dispatching an Event from a Class
Mike, I'm interested in why you would dispatch an Event from your
modelLocator? Could you please share?
Also, could this be a case where the Observe tag could help you?
http://weblogs.macromedia.com/paulw/archives/2006/05/the_worlds_smal.cfm
Thanks
Sam
On 1/9/07, Mike Anderson [EMAIL PROTECTED] wrote:
Yes, I understand this -
But what about a generic class, that does NOT extend any other
classes (which have the IEventDispatcher as part of their makeup)
In my generic class (in this case, my ModelLocater which is part
of a Cairngorm-based application), it doesn't natively have anything in
there which includes the EventDispatcher stuff.
So, I wanted to see what the bare minimum requirements would be,
in order to Dispatch an Event from a Class File that doesn't extend or
implement anything else.
Also, I DO have the [Bindable] Metatag on this class, and even
know I don't get any code-hinting whenever I type any dispatchEvent
type code, I don't get any Compiler Errors either... That struck me as
odd, but with what Tracy just mentioned, it does answer a few
questions...
So I guess, the [Bindable] Metatag is a quick way to add this
functionality, but I am just curious if I wanted to accomplish this via
some other means.
Thanks for the info on this topic :)
Mike
From: flexcoders@yahoogroups.com http://ups.com/ [mailto:
flexcoders@ mailto:flexcoders@ yahoogroups.com] On Behalf Of Sergey
Kovalyov
Sent: Tuesday, January 09, 2007 1:28 PM
To: [EMAIL PROTECTED] ups.com http://ups.com/
Subject: Re: [flexcoders] Dispatching an Event from a Class
Just call dispatchEvent() (e. g. dispatchEvent(new
Event(Event.CHANGE))) in any class that implements IEventDispatcher (e.
g. all the EventDispatcher successors). Note, that UIComponent and all
its successors implement IEventDispatcher, so dispatchEvent() could be
called in any subclass of Box, ComboBox, Label, TextArea, HSlider, etc:
package {
import mx.controls.HSlider;
public class MyHSlider extends HSlider {
public function MyHSlider() {
super();
dispatchEvent(new Event(instanceConstructed));
}
}
}
On 1/9/07, Mike Anderson [EMAIL PROTECTED] wrote:
Hello All,
I am attempting to dispatch an Event from a generic
Class File, and I
guess I'm not doing it correctly.
I
