python - pyqt qtabwidget horizontal tab and horizontal text in QtDesigner

Question

i am having problem to change text alignment using pyqt4 desginer i have made tabs horizontal by aligning west but the text in that goes north to south that looks bad i want to change alignment of text as horizontal how can i do that...thanks in advance.

this is my ui.py code

# Form implementation generated from reading ui file 'untitled.ui'
#
# Created by: PyQt4 UI code generator 4.11.4
#
# WARNING! All changes made in this file will be lost!

from PyQt4 import QtCore, QtGui

try:
    _fromUtf8 = QtCore.QString.fromUtf8
except AttributeError:
    def _fromUtf8(s):
        return s

try:
    _encoding = QtGui.QApplication.UnicodeUTF8
    def _translate(context, text, disambig):
        return QtGui.QApplication.translate(context, text, disambig, _encoding)
except AttributeError:
    def _translate(context, text, disambig):
        return QtGui.QApplication.translate(context, text, disambig)

class Ui_MainWindow(object):
    def setupUi(self, MainWindow):
        MainWindow.setObjectName(_fromUtf8("MainWindow"))
        MainWindow.resize(800, 600)
        self.centralwidget = QtGui.QWidget(MainWindow)
        self.centralwidget.setObjectName(_fromUtf8("centralwidget"))
        self.gridLayout = QtGui.QGridLayout(self.centralwidget)
        self.gridLayout.setObjectName(_fromUtf8("gridLayout"))
        self.tabWidget = QtGui.QTabWidget(self.centralwidget)
        self.tabWidget.setTabPosition(QtGui.QTabWidget.West)
        self.tabWidget.setObjectName(_fromUtf8("tabWidget"))
        self.tab = QtGui.QWidget()
        self.tab.setObjectName(_fromUtf8("tab"))
        self.tabWidget.addTab(self.tab, _fromUtf8(""))
        self.tab_2 = QtGui.QWidget()
        self.tab_2.setObjectName(_fromUtf8("tab_2"))
        self.tabWidget.addTab(self.tab_2, _fromUtf8(""))
        self.tab_3 = QtGui.QWidget()
        self.tab_3.setObjectName(_fromUtf8("tab_3"))
        self.tabWidget.addTab(self.tab_3, _fromUtf8(""))
        self.gridLayout.addWidget(self.tabWidget, 0, 0, 1, 1)
        MainWindow.setCentralWidget(self.centralwidget)
        self.menubar = QtGui.QMenuBar(MainWindow)
        self.menubar.setGeometry(QtCore.QRect(0, 0, 800, 31))
        self.menubar.setObjectName(_fromUtf8("menubar"))
        MainWindow.setMenuBar(self.menubar)
        self.statusbar = QtGui.QStatusBar(MainWindow)
        self.statusbar.setObjectName(_fromUtf8("statusbar"))
        MainWindow.setStatusBar(self.statusbar)

        self.retranslateUi(MainWindow)
        self.tabWidget.setCurrentIndex(0)
        QtCore.QMetaObject.connectSlotsByName(MainWindow)

    def retranslateUi(self, MainWindow):
        MainWindow.setWindowTitle(_translate("MainWindow", "MainWindow", None))
        self.tabWidget.setTabText(self.tabWidget.indexOf(self.tab), _translate("MainWindow", "Tab 1", None))
        self.tabWidget.setTabText(self.tabWidget.indexOf(self.tab_2), _translate("MainWindow", "Tab 2", None))
        self.tabWidget.setTabText(self.tabWidget.indexOf(self.tab_3), _translate("MainWindow", "Page", None))


if __name__ == "__main__":
    import sys
    app = QtGui.QApplication(sys.argv)
    MainWindow = QtGui.QMainWindow()
    ui = Ui_MainWindow()
    ui.setupUi(MainWindow)
    MainWindow.show()
    sys.exit(app.exec_())

and this is my main file where i ll add all the functions and from here i generate my window

from untitled import *
from PyQt4 import QtGui # Import the PyQt4 module we'll need
import sys # We need sys so that we can pass argv to QApplication
import os

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


class MainWindow(QMainWindow,Ui_MainWindow):
    def __init__(self, parent=None):
        QMainWindow.__init__(self, parent)
        self.setupUi(self)

if __name__ == '__main__':
    app = QApplication(sys.argv)
    w = MainWindow()
    w.show()
    sys.exit(app.exec_())

Answer 1

The solution that I propose may not be the exact solution but I think it is the one that comes closest. What I propose is to promote the QTabWidget to use a custom QTabWidget.

Before that I have improved the solution proposed in this answer:

tabwidget.py

from PyQt4 import QtGui, QtCore


class HorizontalTabBar(QtGui.QTabBar):
    def paintEvent(self, event):
        painter = QtGui.QStylePainter(self)
        option = QtGui.QStyleOptionTab()
        for index in range(self.count()):
            self.initStyleOption(option, index)
            painter.drawControl(QtGui.QStyle.CE_TabBarTabShape, option)
            painter.drawText(self.tabRect(index),
                             QtCore.Qt.AlignCenter | QtCore.Qt.TextDontClip,
                             self.tabText(index))

    def tabSizeHint(self, index):
        size = QtGui.QTabBar.tabSizeHint(self, index)
        if size.width() < size.height():
            size.transpose()
        return size


class TabWidget(QtGui.QTabWidget):
    def __init__(self, parent=None):
        QtGui.QTabWidget.__init__(self, parent)
        self.setTabBar(HorizontalTabBar())

This file will be stored next to the .ui file and the .py files as shown in the following structure:

.
├── main.py        # file of class MainWindow(QMainWindow,Ui_MainWindow):
├── tabwidget.py   # custom QTabWidget
├── untitled.py    
└── untitled.ui    # your design

After having the previous structure we open the .ui file with Qt Designer and we right click on the QTabWidget and select promoted to ...:

A dialogue will open and the following should be placed in it:

Then press the add button and then the promote button, and at the end you generate the .py file again with the help of pyuic

At the end you get the following widget: