Mixins - Inherits from two QLineEdits using UiLoader

Flanagan

I have two custom QLineEdit:

ValidatedQLineEdit
DelayedQLineEdit

If I want to have a QLineEdit with the functionality of both, how do I do it?

I am doing this:

class DelayedValidatedLineEdit(DelayedLineEdit, ValidatedLineEdit):
    pass

But when I run it Qt creates an empty QLineEdit for me and then:

This happens because my two custom QLineEdit inherits from QLineEdit. If one of them did not inherit from anyone, it does work.

If I create the DelayedValidatedLineEdit manually it works but I'm loading the ui file with the promoted QLineEdit and then this happens.

from PySide2 import QtCore, QtWidgets

from utils import Color


class DelayedLineEdit(QtWidgets.QLineEdit):
    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)

        self.delay = 250
        self.timer = QtCore.QTimer()
        self.timer.setSingleShot(True)

        self.textEdited.connect(self._restart_timer)

    def _restart_timer(self):
        self.timer.start(self.delay)


class ValidatedLineEdit(QtWidgets.QLineEdit):
    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.color = Color.DEFAULT

    def color_default(self):
        if self.color != Color.DEFAULT:
            self.color = Color.DEFAULT
            self.setStyleSheet(None)

    def color_red(self):
        if self.color != Color.RED:
            self.color = Color.RED
            self.setStyleSheet('background-color: rgb(255, 200, 200)')

    def validate(self, extra_condition=True, validate_empty=True):
        if (not validate_empty or self.text()) and extra_condition:
            self.color_default()
        else:
            self.color_red()


class DelayedValidatedLineEdit(DelayedLineEdit, ValidatedLineEdit):
    pass

Flanagan

And I fixed it, I have copied the code as is from the third link I put in one message above. Now it works.

https://gist.github.com/fredrikaverpil/0a89b174c9d29bc585f11d250adf2a7c

Now I can go in peace but against your recommendations xD

Flanagan

@Denni-0

Thank you very much for your work! I like your code, it shows that you have experience.

That resource you found on google was one that I looked to try to fix this.

I understand that super() is a problem because of the differences between Python and C++, I will try not to use it.

I have had to make some modifications to your code to make it work with my UiLoader class. Unfortunately, in the end, it returns the same error as it had before.

The modifications I have made to your code are the following:

And I've also had to add *args and **kwargs so UiLoader won't throw me an error.

from PySide2.QtCore import *
from PySide2.QtWidgets import *

from utils import Color


class Delayer(QTimer):
    def __init__(self, *args, **kwargs):
        QTimer.__init__(self, *args, **kwargs)

        self.delay = 250
        self.setSingleShot(True)

    def Restart(self):
        self.timer.start(self.delay)


class DelayedLineEdit(QLineEdit):
    def __init__(self, *args, **kwargs):
        QLineEdit.__init__(self, *args, **kwargs)

        self.Delyr = Delayer()
        self.textEdited.connect(self.Delyr.Restart)


class Validator(QObject):
    def __init__(self, LinEditr, *args, **kwargs):
        QObject.__init__(self, *args, **kwargs)
        self.LneEdt = LinEditr
        self.color = Color.DEFAULT

    def SetColorDefault(self):
        if self.color != Color.DEFAULT:
            self.color = Color.DEFAULT
            self.LneEdt.setStyleSheet(None)

    def SetColorRed(self):
        if self.color != Color.RED:
            self.color = Color.RED
            self.LneEdt.setStyleSheet('background-color: rgb(255, 200, 200)')

    def Valid(self, validate_empty=True, extra_condition=True):
        if (not validate_empty or self.LneEdt.text()) and extra_condition:
            self.SetColorDefault()
        else:
            self.SetColorRed()


class ValidatedLineEdit(QLineEdit):
    def __init__(self, *args, **kwargs):
        QLineEdit.__init__(self, *args, **kwargs)

        self.Vldatr = Validator(self)
    # Nothing within your code snippet did more than this
    # which does nothing but I assume your finished piece
    # makes that connection


class DelayedValidatedLineEdit(QLineEdit):
    def __init__(self, *args, **kwargs):
        QLineEdit.__init__(self, *args, **kwargs)
        # Here is the semi-universal Validator
        self.Vldatr = Validator(self)

        # Here is the semi-universal Delayer
        self.Delyr = Delayer()
        self.textEdited.connect(self.Delyr.Restart)

I got my UiLoader class from these sources:

My UiLoader class:

from PySide2.QtUiTools import QUiLoader


def load_ui(ui_file, base_instance=None, custom_classes=()):
    loader = UiLoader(base_instance)
    for custom_class in custom_classes:
        loader.registerCustomWidget(custom_class)
    loader.load(ui_file)


class UiLoader(QUiLoader):
    def __init__(self, base_instance):
        super().__init__()
        self.base_instance = base_instance

    def createWidget(self, class_name, parent=None, name=''):
        if parent is None and self.base_instance:
            return self.base_instance
        else:
            return super().createWidget(class_name, parent, name)

Flanagan

Yeah it works but the UiLoader is so useful... I can edit the gui, save and run. Otherwise you would have to generate the .py code, format the code ... (before doing it like this)

I will search on the internet again to see if I find how to fix the UiLoader.

Flanagan

And I fixed it, I have copied the code as is from the third link I put in one message above. Now it works.

https://gist.github.com/fredrikaverpil/0a89b174c9d29bc585f11d250adf2a7c

Now I can go in peace but against your recommendations xD