hi, thx for the info.
regards, greg. 2011/10/12 Doug Bell <do...@bellz.org> > Grégory Starck wrote: > > Hi dear list, > > > > on windows7-64, with python32 (and also with python27) (-x86) and > > pyqt-4.8.5-1: > > > > First of all: I'm quite new with Qt (pyqt).. and so I don't know all > > of it, even more specifically about the restrictions/exceptions/etc.., > > from far. > > > > in a quite simple window (just a tableWidget and few buttons > > basically) : > > > > I connected the itemChanged signal/event of the tableWidget to one of > > my method. ( gui.tableWidget.itemChanged.connect(self.onCellChanged) > > ) > > > > but in this method I want to be able to eventually re-modify the value > > of the item (depending on some conditions).. > > > > but doing so re-generate a itemChanged event.. so in that case my > > method was called 1 extra time that I don't want. > > > > I used to work around that by : on begin of my method : I disconnect > > the event itemChanged from my method. And on exit of my method I > > re-connect the signal to it. > > > > my question is : does it sound like all right to you ?? > > > > because with that I sometimes (but quite highly reproducible) get real > > crash from QtCore.. but without any valuable detail. as far as I > > understood : it could be a problem because I disconnect-reconnect the > > event handler from within the handler itself AND ALSO, apparently, > > that I was also displaying a QtGui.QMessageBox from within my method. > > (when I remove the display of the Qmsgbox then the crash doesn't occur > > anymore, never, as far I could see). > > > > Now I've totally work around the problem/crash by using a bool flag > > that I initially set to False. when my itemChanged event handler > > enters : it checks for the flag. if True -> the method directly > > returns. Else it sets the flag to True and the method executes > > normally. before returning from it I reset the flag to False. So that > > if I change the value of the item in the method then the method will > > still be called 1 extra time but I notice it thx to the flag. > > A cleaner way to do this is to use widget.blockSignals(True) before > re-modifying the value and then widget.blockSignals(False) afterward. > > -Doug > _______________________________________________ > PyQt mailing list PyQt@riverbankcomputing.com > http://www.riverbankcomputing.com/mailman/listinfo/pyqt >
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