[PyQt] simpler 'connect' function
phil at riverbankcomputing.co.uk
Thu Jan 17 23:34:58 GMT 2008
On Thursday 17 January 2008, Ewald de Wit wrote:
> On Thursday 17 January 2008 18:27:19 Peter Shinners wrote:
> > > button.clicked.connect(self.onButtonClicked)
> > Is there a clean way to handle signals with the same name that take
> > different arguments? Here's an idea I can think of for QComboBox.
> > combo.activated[int].connect(callback1)
> > combo.activated[QString].connect(callback2)
The problem with this approach is that you can't represent all C++ argument
types with Python types.
> A simpler way would be to just give the signal objects a different name,
> like activatedInt and activatedString. It's the easiest way to uniquely
> specify which signal you mean.
The problem with this is that things can get clunky -
focusChangedQWidgetPtrQWidgetPtr for example.
Those that don't like strings because they can't be type checked are wrong.
They can be type checked against Qt signals (see
QMetaObject::indexOfSignal()). The problem is that they can't be
distinguished from Python signals which are not pre-defined.
My prefered option at the moment is just not to support Python signals in any
new approach - short-circuit signals would have to be used instead (which
don't have parentheses and are therefore easy to distinguish from Qt
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