[PyQt] PyQt4 question

[Phil Thompson]

On Saturday 26 May 2007 9:07 pm, Detlev Offenbach wrote:
> On Samstag, 26. Mai 2007, Phil Thompson wrote:
> > On Saturday 26 May 2007 7:58 pm, Detlev Offenbach wrote:
> > > On Samstag, 26. Mai 2007, Phil Thompson wrote:
> > > > On Saturday 26 May 2007 4:52 pm, Detlev Offenbach wrote:
> > > > > Hi,
> > > > >
> > > > > is there a PyQt equivalent to "qobject_cast<T*>(object)"?
> > > >
> > > > sip.cast()?
> > > >
> > > > But it shouldn't be necessary if the sub-class conversion code has
> > > > been properly implemented.
> > >
> > > How do I do that. I haven't wrapped complicated stuff like this so far.
> > > The situation is as follows. I have the following code:
> > >
> > >         self.plugins.extend(self.designer.pluginManager().instances())
> > >         for plugin in self.plugins:
> > >             if isinstance(plugin, QDesignerFormEditorPluginInterface):
> > >                 if not plugin.isInitialized():
> > >                     plugin.initialze(self.designer)
> > >
> > >
> > > "self.designer.pluginManager().instances()" returns a list of QObject.
> > > The first if statement shall check, wether the returned QObject is of
> > > type QDesignerFormEditorPluginInterface. In C++ you would do it with
> > > code like
> > >
> > > if ( (qobject_cast<QDesignerFormEditorPluginInterface*>(plugin)) )
> > >
> > > How can the problem be solved with PyQt4 and Python?
> > >
> > > Note: self.designer.pluginManager() returns an object of type
> > > QDesignerPluginManager.
> >
> > The wrapper for QDesignerFormEditorPluginInterface must define
> > some %ConvertToSubClassCode which will use RTTI provided by the instance
> > to identify the right Python type object. See how PyQt does it for
> > QObject and QEvent. If the instance doesn't provide any RTTI then you're
> > stuck.
>
> Mustn't the %ConvertToSubClassCode go into the more general class (e.g.
> QObject)?

No - just in a QObject sub-class in the module.

> Is there a way to extend the QObject wrapper? 

That's what sip does under the covers.

Phil