Mark Summerfield wrote: > > The ZeroSpinBox is a tiny example designed to show how the signal/slot > mechanism works. It is just a QSpinBox with the addition of > remembering how many times (all the) ZeroSpinBox(es) have had a 0 > value. > > Nowadays the connections would be made with a new improved syntax: > > self.connect(self, SIGNAL("valueChanged(int)"), self.checkzero) # OLD > self.valueChanged.connect(self.checkzero) # NEW > # or > self.valueChanged[int].connect(self.checkzero) # NEW > > Similarly the emit: > self.emit(SIGNAL("atzero"), self.zeros) # OLD > self.atzero.emit(self.zeros) # NEW > > What's happening inside ZeroSpinBox? Whenever its value is set to 0 it > calls its own checkzero() method, and this in turn emits an atzero > signal with the number of zeros so far. Why does it do this? Just to > show the mechanism. It doesn't matter whether you connect a widget to > itself (unusual but done here), or to another widget (the norm). > > See the book's website https://www.qtrac.eu/pyqtbook.html > for all the source code including some updated with the new syntax. > (But the book is old, so even the Python 3.1 examples aren't as > Pythonic as they would be written in Python 3.4+.)
ah - okay, so i was on the right track - thanks :) cool that you hang out here :) -- https://mail.python.org/mailman/listinfo/python-list