Widgets are not updated - is this a bug?

[Christian ARNAUD]

Hi,

I understand the principle - thank you for sharing - I’m probably going to the same for push button setEnabled which has the same flaw.

Once again thank you for sharing that

Christian

Christian
Le 25 juin 2020 à 18:04 +0200, Raymond Osborn <rayosborn at mac.com>, a écrit :
> It’s mainly the setText functions for QLabel and QLineEdit, e.g.,
>
> class NXLabel(QtWidgets.QLabel):
>     """A text label.
>
>     This is being subclassed from the PyQt QLabel class because of a bug in
>     recent versions of PyQt5 (>11) that requires the box to be repainted
>     after any programmatic changes.
>     """
>
>     def setText(self, text):
>         """Function to set the text in the box.
>
>         Parameters
>         ----------
>         text : str
>             Text to replace the text box contents.
>         """
>         super(NXLabel, self).setText(str(text))
>         self.repaint()
>
> I also added a repaint to the setValue function of QSpinBox and QDoubleSpinBox. I presume they had also given problems, but it might have been a precaution.
>
> class NXSpinBox(QtWidgets.QSpinBox):
>
>     def setValue(self, value):
>         super(NXSpinBox, self).setValue(value)
>         self.repaint()
>
> It doesn’t look as if it affected QTextEdit for some reason, but there may be others that I don’t use.
>
> Ray
>
> > On Jun 25, 2020, at 10:36 AM, Christian ARNAUD <carnaudfree at gmail.com> wrote:
> >
> > Hi Raymond,
> >
> > Thank you for your quick answers.
> > Would it be possible to share how do you subclass the concerned widgets? Is there a specific method that should be overloaded to trigger the repaint event?
> >
> > Christian
> >
> >
> > De : Raymond Osborn <rayosborn at mac.com>
> > Date : jeudi 25 juin 2020 à 15:41
> > À : PyQt mailing list <pyqt at riverbankcomputing.com>
> > Cc : Christian ARNAUD <carnaud at free.fr>
> > Objet : Re: Widgets are not updated - is this a bug?
> >
> > This is a bug that has been an issue since around v5.10 but which only affects Macs as far as I know. In my own code, I have had to subclass virtually every widget whose contents I change programmatically in order to add a call to repaint each time. Since I need my code to be compatible with multiplePyQt versions, I will have to leave it in even if it is fixed.
> >
> > Ray
> >
> >
> > > From: Christian ARNAUD <carnaud at free.fr>
> > > Subject: Widgets are not updated - is this a bug?
> > > Date: June 25, 2020 at 1:46:21 AM CDT
> > > To: <pyqt at riverbankcomputing.com>
> > >
> > >
> > > Hi,
> > >
> > > I ran in a strange behavior where widgets in the view aren’t properly refreshed on change.
> > > Here is the code, developed to show the problem:
> > >
> > > import sys
> > >
> > > from PyQt5 import QtWidgets
> > > from PyQt5.QtCore import Qt
> > >
> > >
> > > class MainWindow(QtWidgets.QMainWindow):
> > >     def __init__(self):
> > >         QtWidgets.QMainWindow.__init__(self)
> > >         self.resize(250, 100)
> > >         self.setWindowTitle("Demo")
> > >         self.centralWidget = QtWidgets.QWidget(self)
> > >         self.formlayout = QtWidgets.QFormLayout(self.centralWidget)
> > >         self.label1 = QtWidgets.QLabel('Text 1', self.centralWidget)
> > >         self.ledit1 = QtWidgets.QLineEdit('initial value', self.centralWidget)
> > >         self.bproceed = QtWidgets.QPushButton('Proceed', self.centralWidget)
> > >         self.bproceed.setDefault(True)
> > >         self.bproceed.setFocusPolicy(Qt.StrongFocus)
> > >         self.formlayout.setWidget(1, QtWidgets.QFormLayout.LabelRole, self.label1)
> > >         self.formlayout.setWidget(1, QtWidgets.QFormLayout.FieldRole, self.ledit1)
> > >         self.formlayout.setWidget(2, QtWidgets.QFormLayout.FieldRole, self.bproceed)
> > >         self.setCentralWidget(self.centralWidget)
> > >
> > >         self.bproceed.clicked.connect(self.on_clicked)
> > >
> > >     def on_clicked(self):
> > >         self.ledit1.setText('')
> > >
> > >
> > > if __name__ == "__main__":
> > >     app = QtWidgets.QApplication(sys.argv)
> > >     win = MainWindow()
> > >     win.show()
> > >     sys.exit(app.exec())
> > >
> > >
> > > If the pushbutton is clicked with the mouse or with the space key (after getting the focus with Tab), the text in the lineedit is not refreshed. If a repaint is forced, it is.
> > > If the pushbutton is clicked with the enter key (after getting the focus with Tab), the text in the lineedit is correctly refreshed.
> > >
> > > Any idea?
> > >
> > > My env:
> > > OSX Catalina 10.15.5
> > > Python 3.6
> > > PyQt: 15.0
> > >
> > > Thank you
> > >
> > >
> > > _______________________________________________
> > > PyQt mailing list
> > > PyQt at riverbankcomputing.com
> > > https://www.riverbankcomputing.com/mailman/listinfo/pyqt
>
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