[PyKDE] Issue with QDialog and lifetime

[Toby Dickenson]

On Thursday 26 May 2005 13:16, Giovanni Bajo wrote:
> Toby Dickenson <tdickenson at devmail.geminidataloggers.co.uk> wrote:
> 
> >> class QDialog2(QDialog):
> >>    def __init__(self, parent=0, name=0, modal=False, flags=0)
> >>        QDialog.__init__(self, parent, name, modal, flags |
> >> Qt.WDestructiveClose)
> 
> Actually, for my project, I'm better off with:
> 
> class QDialog2(QDialog):
>    def __init__(self, parent=0, name=0, modal=False, flags=0)
>         if modal:
>             flags |= Qt.WDestructiveClose
>        QDialog.__init__(self, parent, name, modal, flags)
> 
> Becuase modeless dialogs really need their ownership to be transferred to
> the parent.

modeless..... ahh...... completely different. You are right WDestructiveClose 
is the right tool for that job.

> > That works, but Im not sure I would recommend it. It leads to a bigger
> change
> > should you ever need to access the dialog after it has been closed. (or,
> more
> > likely, the value of a control widget on the dialog)
> 
> Notice that WDestructiveClose does not collect the Python object (of
> course). So you can easily do something like:
> 
> class MyDialog(QDialog2):
>      # bla bla
> 
>      def accept(self):
>          self.value = self.lineedit.text()
> 
> and then later access that string.

But then you need to have a different method to access the text before and 
after the close. I would rather:

    dlg = WhateverDlg(parent)
    dlg.lineedit.setText('foo')
    try:
        ok = dlg.exec_loop()
        if ok:
            print dlg.lineedit.text()
    finally:
        dlg.deleteLater()

plus you avoid the need for that boring code in accept()


-- 
Toby Dickenson

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