[PyQt] Is it possible to get base class references?

Randall Frank rjfrank at ensight.com
Mon Apr 15 16:34:28 BST 2013

    I was not sure how to title this one, but here are the details.
I have a C++ application with an embedded Python interpreter.
I have a QMainWindow (created in C++) for which I have a reference
in PyQt.  Now, I would like to be able to manipulate the QMenuBar
(and children) from PyQt.  I can get the QMenuBar reference just
fine in PyQt and I can walk some of the children of the QMenu I
am interested in, but many are missing.  Now, in C++, I have
subclassed QAction to add some additional features and these
QAction subclasses do not show up when I try to get the list of
children of the QMenu.  Ok, so I do not have a SIP wrapper for
these QAction classes.  In PyQt, I would like to be able to get
references to these objects using the first class known to PyQt.
Is this possible?

In my example, 'top' is a QMainWindow instance that was
created in C++:

def walk_menu(i,m):
    s = m.title()
    print i+"Menu: "+str(s)
    for t in m.children():
        if (type(t) == PyQt4.QtGui.QMenu):
            tmp = i+"  "
        elif (type(t) == PyQt4.QtGui.QAction):
            print i+"  Action: "+t.text()
            print i+str(type(t))

menubar = top.menuBar()
print "Menubar:",menubar
for m in menubar.children():
    if (type(m) == PyQt4.QtGui.QMenu):
        if (m.title().contains("QUERY",PyQt4.QtCore.Qt.CaseInsensitive)):
            q = m
            print "Query menu:",q
            walk_menu(" ",q)

The missing QAction subclasses were created in C++ using a
class like:

class MenuActionItem : public QAction, public QEnsI18N

    MenuActionItem(QObject * parent);


When the QMenu ('q') above was created, it includes MenuActionItem
instances.  I really do not want to expose the QEnsI18N methods via
SIP, so is there any mechanism via which I can have my MenuActionItem
instances show up in PyQt as QAction references?


Randall Frank      rjfrank at ceisoftware.com     919-363-0883
Computational Engineering International www.ceisoftware.com
2166 North Salem Street,  Suite 101,  Apex, NC   27523-6456

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