[PyKDE] sip, was: newest Version

[Roland Schulz]

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On Saturday 01 November 2003 13:19, Phil Thompson wrote:
> On Saturday 01 November 2003 8:37 am, Roland Schulz wrote:
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> > Hey,
> >
> > On Saturday 01 November 2003 00:25, you wrote:
> > > On Friday 31 October 2003 9:49 pm, Roland Schulz wrote:
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> > > > Hey,
> > > >
> > > > trying to change the sip layer makes great advancement. Overwriting
> > > > the className function already makes the Preview working!!
> > > > Overwriting metaObject also makes signals, slots and propterties
> > > > (partly) working!! So I think this will work.
> > >
> > > How have you "overwritten" the className function?
> >
> > Adding it to sipqtQWidget.h by hand. See the attached file.
> >
> > > > What I did for className is that I added to sipqtQWidget.h:
> > > > virtual const char *className() const {return "FileChooser";}
> > > >
> > > >
> > > > How should I do this in qwidget.sip? How can I get the classname (of
> > > > course harding it is only for testing)? Calling className from Python
> > > > space gives the correct result, so this should be doable. How can I
> > > > access variables defined in the Python claass? Is there a way to tell
> > > > sip to add this className method to all classes?
> > >
> > > Use the /AutoGen/ option to automatically generate methods, but I'm not
> > > convinced this is going to help.
> >
> > What does this /AutoGen/ function?
>
> Having seen what you've done, /AutoGen/ isn't designed for what you want to
> do. It needs a SIP change to generate the calls.
Could this be done easily?

> > > Remind me how Designer calls the factory
> > > function to create the widget.
> >
> > designer creates an object PyQWidgetPlugin from the library and calls the
> > create method. Create uses pythonize to call the createWidget method in
> > the Python class.
>
> I agree with Jim in that I can't see why adding these functions here is any
> different to using a proxy. 
The problem is not adding the functions to the proxy but to create a working 
proxy. May be I just don't get how to create such a proxy easily. What I did, 
is: I took the header files for QWidget (I want to proxy QWidget), QObject 
and QPaintDevice. The later two are the base classes so I tought there 
methods also have to be proxyed. But it still didn't work and I think the 
problem is that these classes have:
QApplication  QBaseApplication  QDragManager  QETWidget  QFontInfo  
QFontMetrics  QLayout  QPaintDeviceMetrics  QPainter  QSignal  QWSManager  
QWidget
as friend classes. So there I think I would also have to proxy all private 
methods and I don't know how to find out if anyone directly access some 
member variables. So I don't know how to create a QWidget proxy. If I would 
have one, I could do there the changes as easily, but I don't get so far.
Is there an easier/other way to create such an proxy? Otherwise I don't think 
this is a good way to go.

> In the end you are going to need to introspect
> the Python object to return the correct class name and meta-object anyway.
> (However I am coming round to thinking the proxy approach is worse as a
> more general solution.)
agree

> I think what you need to do next is to come up with 2 functions that can go
> into the SIP module/library that can be called from SIP generated code (or
> a proxy) like this...
>
> class sipQFoo : public QFoo
> {
> public:
>     const char *className() const
>     {
>         return sipGetClassNameForCpp(sipPyThis);
>     }
>
>     QMetaObject *metaObject() const
>     {
>         static QMetaObject *metaObj = 0;
>
>         if (!metaObj)
>             metaObj = sipGetMetaObjectForCpp(sipPyThis);
>
>         return metaObj;
>     }
>
>     ...normal ctors...
>
> In fact sipGetClassNameForCpp() is fairly simple...
>
> const char *sipGetClassNameForCpp(sipThisType *sipThis)
> {
>     PyObject *nmo;
>
>     if (sipThis == NULL || (nm = sipClassName((PyObject *)sipThis)) ==
> NULL) return "Unknown class";
>
>     const char *nm = PyString_AsString(nmo);
>     Py_DECREF(nmo);
>
>     return nm;
> }
>
> You can do the other one. :)
I'll try. But it would already be very nice only to have the classname 
function. Like I wrote, this makes already the Preview working.

How can I access variables defined in the Python class?

To get properties working I'll need to also overwrite qt_property. Than I can 
see if they work.

For signals and slots we'll need to do same changes to pyuic too.
For the connection
    <connection>
        <sender>fileChooser1</sender>
        <signal>fileNameChanged(const QString&amp;)</signal>
        <receiver>fileChooser2</receiver>
        <slot>setFileName(const QString&amp;)</slot>
    </connection>

it creates:
self.connect(self.fileChooser1,SIGNAL("fileNameChanged(const 
QString&)"),self.fileChooser2,SLOT("setFileName(const QString&)"))

but has to generate:
self.connect(self.fileChooser1,PYSIGNAL("fileNameChanged"),self.fileChooser2.setFileName)

in the case of a Python class. Of course it has to know if it is a python 
class, but it could get this information from the Comment line.

Than we need to discuss what syntax we want to use to define signals and slots 
in the Python class. One problem is that designer only connects signals and 
slots with fiting arguments, so we have to pass the information about the 
arguments to.
What do you think about a syntax like:
class FileChooser:
	Q_SIGNALS = [["fileNameChanged","QString"]]
	Q_SLOTS = [["setFileName","QString"],["chooseFile"]]
	def __init__ .....

Both are lists of lists of strings. One List for every sinal/slot and the 
first entry of the list is the name. The following the arguments.

regards
Roland
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