[Laszlo-dev] Should this code go into the SWF runtime?

[Sarah Allen]

In the component code and application code that I've been creating, it 
is common to write:
   if (foo.someevent)  foo.someevent.sendEvent()

This avoids debugger warnings if no one is registered for someevent.

Sarah


On Thu, Apr 6, 2006 at  9:01 PM, P T Withington wrote:

> Belay that.  Not sure what I was thinking here.
>
> It would be an optimization to not call sendEvent if the event's 
> delegateList was empty.  At least in the swf runtime, where function 
> calls are costly.
>
> But I'm not sure this is the whole answer.  It looks like you are 
> trying to create some sort of 'null' event for each declaration.  If 
> you do this, you also need to check for this null event when you do 
> add a delegate (and convert it into a real event).
>
> On 2006-04-06, at 20:38 PDT, Henry Minsky wrote:
>
>> So that needs  to be a convention that everyone obeys when they 
>> write calls
>> to sendEvent? Not just in the LFC, I'm just thinking about user 
>> code, if app
>> developers are going to be told to do
>>
>> if (foo.someevent)  foo.someevent.sendEvent()
>>
>> instead of
>>
>> foo.someevent.sendEvent()
>>
>>
>> Or is there some kind of magic we could use to do this  automatically 
>> ?  I
>> guess it would need to be some kind of macro processor :-)
>>
>>
>>
>>
>>
>>
>>
>>
>>
>> On 4/6/06, P T Withington <ptw at openlaszlo.org> wrote:
>>>
>>> If you do, annotate LPP-1915 to say this can be removed when all
>>> callers of sendEvent check for no listeners first (which should be
>>> much more efficient than making a call to the empty function).
>>>
>>> On 2006-04-06, at 19:56 PDT, Henry Minsky wrote:
>>>
>>>>
>>>> This code for declaring events is currently in the DHTML runtime
>>>> but not in the SWF runtime.
>>>>
>>>> Should this go into the SWF runtime as is, or is there anything we
>>>> need to do differently?
>>>>
>>>> [background for the viewing audience; we need to avoid referencing
>>>> properties of null values
>>>> in the DHTML runtime, as it brings the browser javascript
>>>> interpreter to a screeching halt]
>>>>
>>>>
>>>>
>>>>
>>>> LzDeclaredEvent = {};
>>>> LzDeclaredEvent.sendEvent = function ( a ){  return a };
>>>> LzDeclaredEvent.toString = function ( ){
>>>>     return "Declared event";
>>>> }
>>>>
>>>> function DeclareEvent( who , what ){
>>>>     //    debug('declare ' + who + ' what ' + what);
>>>>     who[ what ] = LzDeclaredEvent;
>>>> }
>>>> function DeclareEvents( who , what ){
>>>>     //    debug('DeclareEvents', who, what);
>>>>     for (var i in what) {
>>>>         //info('what', what[i]);
>>>>         who[what[i]] = LzDeclaredEvent;
>>>>     }
>>>> }
>>>>
>>>>
>>>>
>>>>
>>>> --
>>>> Henry Minsky
>>>> Software Architect
>>>> hminsky at laszlosystems.com
>>>>
>>>> _______________________________________________
>>>> Laszlo-dev mailing list
>>>> Laszlo-dev at openlaszlo.org
>>>> http://www.openlaszlo.org/mailman/listinfo/laszlo-dev
>>>
>>>
>>
>>
>> --
>> Henry Minsky
>> Software Architect
>> hminsky at laszlosystems.com
>
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