Event Class (was Re: [Arp] Central dispatcher)

[Christophe Herreman]

Hi Darron,

> This is what's done in C#.  So, instead of new Event("SavePerson") I would 
> have new SavePersonEvent(target, the_person_data_to_save).

What would be the event-type of SavePersonEvent? Just "savePerson" or 
"onSavePerson" or something like that. I like the idea of having custom 
event classes in an application but I'm just thinking that it could make it 
a little harder to know what type/name to use in the class that handles the 
event.

Say I have this Event class:

<code>
class com.ariaware.arp.event.Event{
 public var type:String;

 public function Event(type:String){
  this.type = type;
 }

 public function toString():String{
  return "[com.ariaware.arp.event.Event - Type: " + type + "]";
 }
}
</code>

And then I have an event that extends it:

<code>
import com.ariaware.arp.event.Event;
import be.idiomatic.model.Assessment;

class be.idiomatic.event.StartAssessmentEvent extends Event{

 private var assessment:Assessment;

 public function StartAssessmentEvent(assessment:Assessment){
  super("onStartAssessment");
  this.assessment = assessment;
 }

 public function getAssessment():Assessment{
  return assessment;
 }

 public function toString():String{
  var result:String = "[be.idiomatic.event.StartAssessmentEvent\n";
  result += "- Type: " + type + "\n";
  result += "- Assessment: " + assessment + "\n";
  result += "]";

  return result;
 }
}

</code>

When I dispatch a StartAssessmentEvent, I have to know that the type of the 
event is "onStartAssessment". Is this how it should work, or am I missing 
something here?

regards,
Christophe

----- Original Message ----- 
From: "Darron J. Schall" <darron at darronschall.com>
To: "General List for Ariaware RIA Platform users and developers" 
<Arp at ariaware.com>
Sent: Wednesday, April 20, 2005 5:27 PM
Subject: Re: [Arp] Central dispatcher


> Aral Balkan wrote:
>
>> Thinking about it... if the Controller, instead of passing a viewRef,
>> just passed the Command a reference to the event object, it would
>> probably make the system more flexible. Is this what you're doing Darron?
>
>
> Yes, sorry.. I haven't been following this thread closely (it's long and I 
> missed the beginning of it, and I have to get something done before 2 
> today).  The controller passes the entire event to the command, and lets 
> the command figure out what to do with it.  This way, I get the view that 
> generated the event (event.target), and I also get all of the necessary 
> data that the command needs (event.data).. for instance, I would pass a VO 
> as event.data, because the "SavePerson" event *needs* the VO, because the 
> VO describes what needs to be saved.
>
>> This still wouldn't make events independent, though...
>
>
> Why not?  It would probably be better, instead of just using one main 
> Event and stuffing different things into event.data, to create subclasses 
> of events.  This is what's done in C#.  So, instead of new 
> Event("SavePerson") I would have new SavePersonEvent(target, 
> the_person_data_to_save).
>
> I might be confused just from not paying attention to the tread though. 
> If this doesn't make sense, just ignore me.. kinda swamped today.
>
> -d
>
>
>
> _______________________________________________
> Arp mailing list
> Arp at ariaware.com
> http://ariaware.com/mailman/listinfo/arp_ariaware.com
>