CODEWITHSUNDEEP
pythonc++qtpyqtporting
Colin Lee
Colin Lee

Reputation: 27

Port C++ class to PyQt

I am trying to convert a Qt4 custom widget written in C++ to a Python 2.7 custom widget. However, I have not been able to figure out how QLabel(parent) would be written in Python. This is the original C++ code from the ".ccp" file:

DocumentWidget::DocumentWidget(QWidget *parent)
    : QLabel(parent)
{
    currentPage = -1;
    setAlignment(Qt::AlignCenter);
}

The QLabel(parent) seems to be some sort of initializer list. I've tried using multiple inheritance in Python in parallel, but this leads to the following error: Cannot create a consistent method resolution order (MRO) for bases QLabel, QWidget.

I'm trying to port the code instead of creating a wrapper for the C++ widget, because I don't know C++ and think I will have to customize the widget further in the future.

I'm not trained as a programmer and this is the first day I ran into C++, so feel free to correct me even if I'm doing something silly. I will not feel embarrassed.

Upvotes: 0

Views: 618

Answers (2)

Colin Lee
Colin Lee

Reputation: 27

Multiple inheritance worked, but the base classes had to be called in the correct order (i.e., DocumentWidget(QLabel, QWidget) instead of DocumentWidget(QLabel, QWidget)).

In full:

from PyQt4.QtCore import *
from PyQt4.QtGui import *

class DocumentWidget(QLabel, QWidget):
    def __init__(self, parent=None):
        super(DocumentWidget, self).__init__()
        self.currentPage = -1
        self.setAlignment(Qt.AlignCenter)

Upvotes: 0

ekhumoro
ekhumoro

Reputation: 120798

The code defines a constructor for the DocumentWidget class, which inherits QLabel and requires a QWidget as parent.

The equivalent PyQt code would be:

from PyQt4 import QtCore, QtGui

class DocumentWidget(QtGui.QLabel):
    def __init__(self, parent):
        super(DocumentWidget, self).__init__(parent)
        # or QtGui.QLabel.__init__(self, parent)
        self.currentPage = -1
        self.setAlignment(QtCore.Qt.AlignCenter)

Upvotes: 3

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