[PyKDE] QValidator.fixup() and PyQt

[Phil Thompson]

On Monday 24 February 2003 8:33 pm, Jonathan Gardner wrote:
> I am trying to implement my own QValidator so that I can do cool things
> like enter money, phone numbers, etc...
>
> Anyway, I would like to be able to modify the QString passed into fixup().
> However, the code below (obviously) doesn't work.
>
> # Begin code
> import sys
> from qt import *
>
> class validator(QValidator):
>
>     def __init__(self, parent=None, name=None):
>         QValidator.__init__(self, parent, name)
>
>     def validate(self, input, pos):
>         return (QValidator.Intermediate, pos)
>
>     def fixup(self, input):
> 	# How to do an in-place modification of input?
>         input = QString("no!")
>
> class test_validator(QWidget):
>
>     def __init__(self, parent=None, name=None, fl=0):
>         QWidget.__init__(self, parent, name, fl)
>
>         lo = QVBoxLayout(self, 11, 6)
>
>         self.le = QLineEdit(self)
>         self.le.setValidator(validator(self.le))
>
>         lo.addWidget(self.le)
>
> if __name__ == "__main__":
>     app = QApplication(sys.argv)
>     args = app.argv()
>     QObject.connect(app,SIGNAL("lastWindowClosed()"),app,SLOT("quit()"))
>     w = test_validator()
>     app.setMainWidget(w)
>     w.show()
>     app.exec_loop()
> # End code
>
> This method above doesn't work. I need a way to modify 'input' so that
> fixup can actually do something.
>
> Any ideas?
>
> Or should I be returning the the value like it does for other functions
> that accept a C++ '&' parameter? (And since PyQt doesn't handle this... is
> it a bug?)

Your code is replacing the string with a new one rather than trying to modify 
the one passed in. For example the following will convert the input to upper 
case...

    def fixup(self, input):
        input.replace(0,100,input.upper())

I admit that this isn't particularly intuitive - one of those things that I 
might do a different way if I was starting again.

Phil