[PyQt] Proposal for New-style Signals

nytmyn nytmyn at gmail.com
Wed Jan 30 21:12:23 GMT 2008

> On Wednesday 30 January 2008, nytmyn wrote:
>> The stage 2 simplified qt signals looks just great :)
>> What about signals declared in Python? I'd really like to have
>> the possibility to declare and use them as the qt ones.
> You can do that now using __pyqtSignals__.

I know I can use __pyqtSignals__ . Maybe I missed something about it, but I
think it can't provide similar syntax as you proposed for qt signals. I mean
things like object.signalFoo.connect(..) and similar. And I find having
different syntaxes for qt and python signals/slots inconvenient. (I know I
can use old, consistent, string based syntax). There are qt signals, python
signals, shortcut signals, c++ signatures declarations, __pyqtSignals etc.
In my opinion signals in PyQt are unnecessarily complicated for newcomers.

>> All QObjects derrived classes are passed as pointers and
>> the values based classes are (really) often passed as const references
>> so signatures of python declared signals and slots could be formed from
>> python types and use
>> c++ string based declarations only for more complicated cases.
>> I admit I really love C++ but I hate seeing it in Python :)
>> class Example(QObject):
>>   signalFoo = Signal(int)
>>   @pyqtSignature("newSlotName", int, QImage)
>>   def slotBar(self, number, image):
>>     pass
> Strings are going to stay for the reasons I've already given.

I don't wanna have strings removed, I just thought using python types would
be enough for Qt and it could help people not used to c++ and would mean
less typing, less error/typos prone code, code completion etc. for others
and wouldn't hurt string lovers :) Of course I can use wrappers on top of
slot decorator and signal declaration if I'm the only one interested :).

> Phil
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