Collection of compatibility issues between Qt5 and Qt6

[dalthviz]

I was going to create a new issue for each but it seems I have a bunch of small ones:

Issue 1:

        self._proxyModel = QSortFilterProxyModel(self)

        self._proxyModel.setSourceModel(self)

        self._proxyModel.setRecursiveFilteringEnabled(True)  # type: ignore[arg-type]

        self._proxyModel.setFilterCaseSensitivity(False if qtpy.API_NAME in ("PyQt5", "PySide2") else QtCore.Qt.CaseInsensitive)  # type: ignore[arg-type]

raises an exception and includes the phrase 'incorrect signature' in the message.

Issue 2:

if qtpy.API_NAME in ("PyQt6", "PySide6"):

    ...

else:

    from qtpy.QtWidgets import QDesktopWidget

Would love to know the correct place to import QDesktopWidget from in the above?

Issue 3:

def SomeWindow(QMainWindow):

    def __init__(*args, **kwargs):

        if qtpy.API_NAME in {"PySide2", "PyQt5"}:

            self.player.error.connect(lambda _=None: self.handleError())

        else:

            self.player.errorOccurred.connect(lambda *args, **kwargs: self.handleError(*args, **kwargs))

        if qtpy.API_NAME in ["PyQt5", "PySide2"]:

            # PyQt5 and PySide2 code path

            from qtpy.QtMultimedia import QMediaContent



            def set_media(data: bytes | None):

                if data:

                    self.buffer = QBuffer(self)

                    self.buffer.setData(data)

                    self.buffer.open(QIODevice.ReadOnly)

                    self.player.setMedia(QMediaContent(), self.buffer)

                    QtCore.QTimer.singleShot(0, self.player.play)

                else:

                    self.blinkWindow()



        elif qtpy.API_NAME in ["PyQt6", "PySide6"]:

            # PyQt6 and PySide6 code path

            def set_media(data: bytes | None):

                if data:

                    self.tempFile = NamedTemporaryFile(delete=False, suffix=".wav")

                    self.tempFile.write(data)

                    self.tempFile.close()

                    print(f"Wrote audioplayer audio data to '{self.tempFile.name}'")

                    self.player.setSource(QUrl.fromLocalFile(self.tempFile.name))

                else:

                    self.blinkWindow()

Spent hours on this but I cannot figure out how to get the media player working correctly in qt6. Works fine in pyside2/pyqt5.

Issue 4:

if qtpy.API_NAME in ("PyQt6", "PySide6"):

    from qtpy.QtCore import QRegularExpression as QRegExp

    from qtpy.QtGui import QRegularExpressionValidator as QRegExpValidator

else:

    from qtpy.QtCore import QRegExp

    from qtpy.QtGui import QRegExpValidator



    def resRefValidator(self) -> QRegExpValidator:

        return QRegExpValidator(QRegExp(r"^[a-zA-Z0-9_]*$"))

I'm 70% certain there's a bigger change here than the names that is required. How exactly do I unify my use of q regex objects?

Originally posted by @th3w1zard1 in #490

[th3w1zard1]

I've solved a few of these awhile back after I posted those confusions. Let me know if the qtpy team would like specifics.

[dalthviz]

Thank you for giving this a check @th3w1zard1 ! If you can share the way you workarounded/solved something of the above I think that would be useful indeed. Even if we don't include those solutions inside QtPy itself (at least not yet), most probably people facing the incompatibilities above could either use them as you share them here or use them as inspiration to develop workarounds that work with their specific usages of QtPy and general Qt bindings