[Kde-bindings] Qyoto: SIGNALS/SLOTS

Richard Dale Richard_Dale at tipitina.demon.co.uk
Wed Dec 7 16:43:23 UTC 2005

On Wednesday 07 December 2005 15:36, Arno Rehn wrote:
> Hi,
> I experimented a bit and created a more complex Hello-World sample app.
> I wanted to connect the "clicked()" signal of a button to the "quit()" slot
> of QApplication. Got a SIGSEGV.
> I looked into the Qt.cpp of qtruby and it seems as signals and slots are a
> bit difficult.
QtRuby dynamically constructs QMetaObjects, rather than it being done at 
compile time by the moc pre-processor. But the actual runtime is identical. 
We need a way of denoting which methods are slots in C#, and I assume we can 
use 'attributes' (or are they called 'annotations' I've forgotten). Maybe you 
could have a look at how we might mark slots, and then the runtime side 
should be very similar to QtRuby. We don't have to invent anything much new 
apart from that.

> But except this the bindings seem to work quite good :)
> And they are faster than the with IKVM converted qtjava-bindings ;)
That's interesting - I haven't done any timing tests on real proxies in Mono, 
but there's certainly plenty of scope for tuning. I think the performance of 
JNI is supposed to be pretty poor, and I would have used gcj's CNI for the 
next version of QtJava, along with java dynamic proxies.

-- Richard

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