The proper use of QSignalMapper

borntonetwork borntonetwork at gmail.com
Thu Jan 18 03:04:19 CET 2007


Thanks, David, for you help.

When I change the slot function to what you show in your second
example, I get the same results: nothing. When I change it to what you
have in your first example, I get the following:

Object::connect: No such slot QApplication::map()
Object::connect:  (sender name:   'chkProductIngredientsDelete_1')
Object::connect:  (receiver name: 'main.py')
Object::connect: No such slot QApplication::map()
Object::connect:  (sender name:   'chkProductIngredientsDelete_2')
Object::connect:  (receiver name: 'main.py')
Object::connect: No such slot QApplication::map()
Object::connect:  (sender name:   'chkProductIngredientsDelete_3')
Object::connect:  (receiver name: 'main.py')
Object::connect: No such slot QApplication::map()
Object::connect:  (sender name:   'chkProductIngredientsDelete_4')
Object::connect:  (receiver name: 'main.py')
Object::connect: No such slot QApplication::map()
Object::connect:  (sender name:   'chkProductIngredientsDelete_5')
Object::connect:  (receiver name: 'main.py')
Object::connect: No such slot QApplication::map()
Object::connect:  (sender name:   'chkProductIngredientsDelete_6')
Object::connect:  (receiver name: 'main.py')


David Boddie wrote:
> borntonetwork wrote:
>
> > I am trying to implement QTCore.QSignalMapper using PyQT. I finally got
> > to a point where I don't receive any compile or runtime error messages,
> > but I also do not see the final slot function fire off. Here is a
> > snippet of the code:
> >
> >         self.signalMapper = QtCore.QSignalMapper(window)
> >         # Use qsignalmapper to use of one slot function for multiple
> >         # widgets. The map() function sends the slot an extra param
> >         # that identifies the sender.
> >         for idx in range(1, maxIngredients+1):
> >             wName = 'chkProductIngredientsDelete_'+str(idx)
> >             w = self.__dict__[wName]
> >             self.app.connect(w, QtCore.SIGNAL("stateChanged(int)"),
> >                 self.signalMapper,
> >                 QtCore.SLOT("self.signalMapper.map"))
>
> You need to pass the C++ signature to the SLOT() function. I believe
> you want the form that does not accept any arguments:
>
>              self.app.connect(w, QtCore.SIGNAL("stateChanged(int)"),
>                  self.signalMapper,
>                  QtCore.SLOT("map()"))
>
> Alternatively, you can pass the slot directly to the function:
>
>              self.app.connect(w, QtCore.SIGNAL("stateChanged(int)"),
>                  self.signalMapper.map)
>
> PyQt accepts Python methods as slots, without requiring that they be
> wrapped in calls to SLOT().
> 
> David




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