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))});
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);
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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