Well the problem here is that u don't know what kind of event are
registered and dispatched. Lets say u have a custom class wich has a
method with the name 'doAllThingsPossible' and also has a method with
the name 'click'. This class is registered as an event listener for the
event 'click', how can u know (dynamicly) to what events a certain
object is listening?
In order to do 'removeAllEvents(obj)' the dispatcher needs to keep
record of all objects that registered to an event. To do that u would
need to modify the 'addEventListener' function, and add a property to
the dispatcher class so u are able to save the objects that are
registered as listener, that would be something like this:
var _listeners_obj = new Object();
function addEventListener(event_str, obj)
{
var _listeners_array = _listeners_obj[event_str];
if (!_listeners_array.length)
{
_listeners_array = _listeners_obj[event_str] = new
Array();
};
_listeners_array.push(obj);
return originalAddEventListener(event_str, obj);
};
Now u have an object wich has a key for each event that is listened to,
containing an array with all objects that are listening to that event.
In order to remove all events on a certain object u need to do a loop on
all events, like this"
function removeAllEvents(obj)
{
for (var i in _listeners_obj)
{
var currentEvent_array = _listeners_obj[i];
var l = currentEvent_array.length;
while(l--)
{
if (currentEvent_array[l] == obj)
{
removeEventListener(i, obj);
};
};
};
};
As u can see this is not very effective. The more listeners u have to a
certain object, the more overhead u will have. I recommend u keep track
of the registered events inside your listening object, or perhaps even
write a class that will function as a default listener. This class would
then contain a function removeAllEvents wich will unregister the events
where needed.
Greetz Erik
-----Original Message-----
From: [email protected] [mailto:[EMAIL PROTECTED] On
Behalf Of Scott Barnes
Sent: dinsdag 26 april 2005 8:33
To: [email protected]
Subject: Re: [flexcoders] EventDispatcher Question.
Sorry,
I can locate the listener and can individually unsubscribe events for
that listener, was kind of looking for a forloop style situation where
it can simply iterate over all events a particular object has in its
subscription and simply remove them.
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