Re: Callbacks?

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Re: Callbacks?
by Ben Schleimer on Monday 10/Jul/2006, @06:37

I hate to sound like a simpleton,
but isn't this what signals/slots is supposed to do?

Wouldn't it be possible to make the event trigger a signal in the backend and then all of the connected slots in the script get called? I got the impression that QtRuby could do this... (but I am not an expert)

Cheers,
Ben

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Re: Callbacks?
by Pau Garcia i Quiles on Monday 10/Jul/2006, @15:22

It would be possible to make the event trigger a signal in the backend and call the slots in the script, but it might get bit tricky.

For instance, here's what I'm doing in Korundum/QtRuby to know when a KPresenter presentation has finished:
factory = KDE::LibLoader.self().factory("libkpresenterpart")
@kpresenter = factory.create(w, nil, "KParts::ReadOnlyPart")
@kpresenter.openURL(KDE::URL.new(file))
connect( @kpresenter.widget().children[0], SIGNAL('presentationFinished()'), self, SIGNAL('itemFinished()') )

Look at that: @kpresenter.widget().children[0]. Thanks to Qt introspection I can get to the presentationFinished() signal, but it's quite contrived. It works flawlessly, though.

If the plugin just displays contents and needs no interactivity, another possibility is to use the winId trick: the backend would be an empty QWidget and we then tell the plugin you developed with Kross/QtRuby/PyQt/whatever to display its contents in the window with the winId of the aforementioned QWidget. It works but you get no events, therefore is a very limited approach.

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