On Mon, 5 Dec 2011 18:01:25 -0500, Luke Campagnola <lcamp...@email.unc.edu> wrote: > How about this: > > from PyQt4 import QtCore, QtGui > import sip > class GObject(QtGui.QGraphicsObject): > def boundingRect(self): > return QtCore.QRectF(0, 0, 10, 10) > def paint(self, p, *args): > p.drawRect(self.boundingRect()) > > app = QtGui.QApplication([]) > scene = QtGui.QGraphicsScene() > obj = GObject() > scene.addItem(obj) > items = scene.items(QtCore.QPointF(0,0)) > objAddr = sip.unwrapinstance(sip.cast(obj, QtGui.QGraphicsItem)) > itemAddr = sip.unwrapinstance(sip.cast(items[0], QtGui.QGraphicsItem)) > print "Adresses match:", objAddr == itemAddr > print "QGraphicsObject matches:", obj is items[0]
That turned out to be easier than I thought - thanks for making me look at it in a different way. Try current SIP hg or tonight's snapshot. Phil > On Mon, Dec 5, 2011 at 16:33, Phil Thompson <p...@riverbankcomputing.com> > wrote: >> 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
