[PyKDE] PYKDE Drag and drop

[Boudewijn Rempt]

On Sun, 18 Jun 2000, Phil Thompson wrote:

> Jim Bublitz wrote:
> > 
> > Two questions/problems with DND:
> > 
> > (using PYKDE 0.11/Qt 1.44/KDE 1.2)
> > 
> > 2. (This may indicate my unfamiliarity with Python)
> > If I derive a widget, say from QListView, and want
> > to multiply inherit QDropSite, how do I do the
> > QDropSite init (it needs a pointer to the widget
> > to install the event filter)? I have:
> > 
> > class  KFoo (QListView, QDropSite):
> >      def __init__(self, parent):
> >           QListView.__init__(self, parent)
> > 
> > Do I add:
> > 
> > QDropSite.__init__(self, self)  ??
> > 
> > Also, it seems to make a difference if I do that
> > before or after the QListView call. Of course I
> > can't test this, because (see 1) I'm not getting
> > any events to test it with.
> 
> Sorry - you can't do this in Python. Both the QListView and the
> QDropSite __init__ methods will create separate widgets. The bindings
> only create wrappers for existing C++ classes - what you are trying to
> do is to create a new C++ class, which you can't do from Python.
> 
> If there is no other way of achieving what you want then you will have
> to create KFoo in C++ and then create a new Python module using SIP to
> wrapp the KFoo class.
>

It should be possible to find a solution in Python. Why not take 
a leaf out of the visual basic book, and inherit by aggregation?
Takes a bit more work, but should work like a charm:

class myClass(QWidget):

  def__init__(self, args):
    self.listview=QListView(...)
    self.dropsite=QDropSite(...)
    
Then define all the methods you need and have them call the
right constituent method.

  def insertItem(...)
    self.listview.insertItem(...)