Christian Boulanger schrieb:
> Hi everybody,
>
> The existing event system which can be attached to a "global/central"
> point - be it window.application or whatever already delivers already
> exactly what everybody is calling for. For example, enabling or
> disabling a whole set of "paste" buttons - in the menubar, in the
> context menu, whereever - you just need to add a
>
> window.application.addEventListener("enable-paste-button",function(e){myCurrentButton.setEnabled(e.getData))});
Yes this should work. But a real communication system is much more
advanced than simply using events. Also using events for this mean to
create many temporary objects (events). I would like better to have some
real message bus.
>
> or, in PHP QxBuilder (Christoph, it would be better if you called your
> project differently because you're implementing something very different
> to the existing QxBuilders):
>
> <qx:menuButton
> label="Paste"
> icon="icons/16/edit-paste.png"
> enabled="false"
> enableOnGlobalEvent="allow-paste">
> <qx:command onExecute="bg_references_list.handlePaste()" />
> </qx:menuButton>
>
> The clipboard code doesn't need to know about how many paste buttons are
> out there, it just need to dispatch
>
> window.application.createDispatchDataEvent("allow-paste", true/false);
could maybe also be:
qx.core.bus.emit("allow-paste", true/false);
Sebastian
>
> in order to achieve the desired effect. Wrapper functions can make the
> code less inelegant. A new solution would be fine - but for folks who
> still work with the 0.5.x branch, there is everything you need already
> there...
>
> Christian
>
>
> Sebastian Werner schrieb:
>> Hi!
>>
>> Also interesting is some global communication layer.
>>
>> In my opinion we need both, something to communicate in *one*
>> application. We don't want to use hard connections here. We want to make
>> this application or part as flexible as possible.
>>
>> After this we need some application/part communication. Something like
>> dbus (http://www.freedesktop.org/wiki/Software/dbus) for javascript
>> would be helpful in my opinion.
>>
>> Generally each system you use, produce some overhead compared to not
>> using it at all. The best would be to use simple function calls in
>> high-performance areas. The creation of the event object is the first
>> thing what is needed to do more in this case, compared to simple
>> function calls between different objects. But it's OK to use this system
>> in about 90% of the use cases I think.
>>
>> Sebastian
>>
>>
>>
>>
>> Christian Boulanger schrieb:
>>
>>> Hi,
>>>
>>> I am currently converting my app away from using objects which call each
>>> other's methods to for some behaviour to objects which communicate which
>>> each other through global events
>>> (window.application.createDispatchEvent("foo"),
>>> window.application.createDispatchDataEvent("foo", {blub:true},
>>> window.application.addEventListener("foo", function(e){....}), and am
>>> very much intrigued by the idea. Advantages include that I do not have
>>> to give objects names in the global namespace or in an object registry.
>>> All objects just exist independently and listen for each others events
>>> to react to them (or not). All the behaviour code is located at the
>>> object level - it is also easier to keep the application stable because
>>> missing or broken functions cannot break it. I am thinking of extending
>>> the system to include client-server communication.
>>>
>>> Since the idea seems so nice to me, I wonder what the drawbacks might
>>> be. Do you expect a major performance loss?
>>>
>>> Thanks for any input,
>>>
>>> Christian
>>>
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>>
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>
>
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