On Mon, 5 Dec 2011 12:24:57 -0500, Luke Campagnola <lcamp...@email.unc.edu> wrote: > Howdy Phil, > I'm running into this issue where QGraphicsScene.items() does not > return the correct python objects if the items are subclassed from > QGraphicsObject. Your response to this issue several months ago was: > > On Fri, May 20, 2011 at 11:46, Phil Thompson > <p...@riverbankcomputing.com> wrote: >> It's because QGraphicsObject inherits both QObject and QGraphicsItem. >> items() returns a list of QGraphicsItems which, for a QGraphicsObject, >> has >> a different C++ address than the original QGraphicsObject. PyQt doesn't >> recognise that the QGraphicsItem is a cast of the QGraphicsObject. I >> don't >> think there is anything I can (sensibly) do about this. > > The workaround I am using for this bug is to maintain a dictionary > that maps from the QtGui::QGraphicsItem memory address back to the > original python object. Looks something like: > cache[ sip.unwrapinstance(sip.cast(item, QtGui.QGraphicsItem)) ] = item > > This works, but it's rather messy since every instance of > QGraphicsObject and QGraphicsWidget needs to register itself with this > cache. I presume PyQt already maintains a similar dictionary so that > it can translate between Qt's internal memory addresses and PyQt's > wrapper objects. Would it not be straightforward to implement my > workaround from within PyQt?
Not straightforward, but certainly worth thinking about. Do you have something small I can use as a test case? Phil _______________________________________________ PyQt mailing list PyQt@riverbankcomputing.com http://www.riverbankcomputing.com/mailman/listinfo/pyqt
