Change background color of Tabs in PYQT4

Is it possible in PYQT4 to change the background color of tabs for a QTabWidget? There is a way to change the color of the text but not the background color of the tab.

I have a program with multiple tabs, and I want to give each level its own background color. See attached example.

from PyQt4 import QtCore, QtGui

try:
    _fromUtf8 = QtCore.QString.fromUtf8
except AttributeError:
    _fromUtf8 = lambda s: s

class Ui_Dialog(object):
    def setupUi(self, Dialog):
        Dialog.setObjectName(_fromUtf8("Dialog"))
        Dialog.resize(661, 397)
        self.verticalLayout = QtGui.QVBoxLayout(Dialog)
        self.verticalLayout.setObjectName(_fromUtf8("verticalLayout"))
        self.tabWidget = QtGui.QTabWidget(Dialog)
        self.tabWidget.setObjectName(_fromUtf8("tabWidget"))
        self.tab = QtGui.QWidget()
        self.tab.setObjectName(_fromUtf8("tab"))
        self.verticalLayout_2 = QtGui.QVBoxLayout(self.tab)
        self.verticalLayout_2.setObjectName(_fromUtf8("verticalLayout_2"))
        self.tabWidget_2 = QtGui.QTabWidget(self.tab)
        self.tabWidget_2.setObjectName(_fromUtf8("tabWidget_2"))
        self.tab_3 = QtGui.QWidget()
        self.tab_3.setObjectName(_fromUtf8("tab_3"))
        self.verticalLayout_3 = QtGui.QVBoxLayout(self.tab_3)
        self.verticalLayout_3.setObjectName(_fromUtf8("verticalLayout_3"))
        self.tabWidget_3 = QtGui.QTabWidget(self.tab_3)
        self.tabWidget_3.setObjectName(_fromUtf8("tabWidget_3"))
        self.tab_5 = QtGui.QWidget()
        self.tab_5.setObjectName(_fromUtf8("tab_5"))
        self.verticalLayout_4 = QtGui.QVBoxLayout(self.tab_5)
        self.verticalLayout_4.setObjectName(_fromUtf8("verticalLayout_4"))
        self.tabWidget_4 = QtGui.QTabWidget(self.tab_5)
        self.tabWidget_4.setObjectName(_fromUtf8("tabWidget_4"))
        self.tab_7 = QtGui.QWidget()
        self.tab_7.setObjectName(_fromUtf8("tab_7"))
        self.verticalLayout_5 = QtGui.QVBoxLayout(self.tab_7)
        self.verticalLayout_5.setObjectName(_fromUtf8("verticalLayout_5"))
        self.tabWidget_5 = QtGui.QTabWidget(self.tab_7)
        self.tabWidget_5.setElideMode(QtCore.Qt.ElideRight)
        self.tabWidget_5.setObjectName(_fromUtf8("tabWidget_5"))
        self.tab_9 = QtGui.QWidget()
        self.tab_9.setObjectName(_fromUtf8("tab_9"))
        self.tabWidget_5.addTab(self.tab_9, _fromUtf8(""))
        self.tab_10 = QtGui.QWidget()
        self.tab_10.setObjectName(_fromUtf8("tab_10"))
        self.tabWidget_5.addTab(self.tab_10, _fromUtf8(""))
        self.verticalLayout_5.addWidget(self.tabWidget_5)
        self.tabWidget_4.addTab(self.tab_7, _fromUtf8(""))
        self.tab_8 = QtGui.QWidget()
        self.tab_8.setObjectName(_fromUtf8("tab_8"))
        self.tabWidget_4.addTab(self.tab_8, _fromUtf8(""))
        self.verticalLayout_4.addWidget(self.tabWidget_4)
        self.tabWidget_3.addTab(self.tab_5, _fromUtf8(""))
        self.tab_6 = QtGui.QWidget()
        self.tab_6.setObjectName(_fromUtf8("tab_6"))
        self.tabWidget_3.addTab(self.tab_6, _fromUtf8(""))
        self.verticalLayout_3.addWidget(self.tabWidget_3)
        self.tabWidget_2.addTab(self.tab_3, _fromUtf8(""))
        self.tab_4 = QtGui.QWidget()
        self.tab_4.setObjectName(_fromUtf8("tab_4"))
        self.tabWidget_2.addTab(self.tab_4, _fromUtf8(""))
        self.verticalLayout_2.addWidget(self.tabWidget_2)
        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.verticalLayout.addWidget(self.tabWidget)
        self.buttonBox = QtGui.QDialogButtonBox(Dialog)
        self.buttonBox.setOrientation(QtCore.Qt.Horizontal)
        self.buttonBox.setStandardButtons(QtGui.QDialogButtonBox.Cancel|QtGui.QDialogButtonBox.Ok)
        self.buttonBox.setObjectName(_fromUtf8("buttonBox"))
        self.verticalLayout.addWidget(self.buttonBox)

        self.retranslateUi(Dialog)
        self.tabWidget.setCurrentIndex(0)
        self.tabWidget_2.setCurrentIndex(0)
        self.tabWidget_3.setCurrentIndex(0)
        self.tabWidget_4.setCurrentIndex(0)
        self.tabWidget_5.setCurrentIndex(0)
        QtCore.QObject.connect(self.buttonBox, QtCore.SIGNAL(_fromUtf8("accepted()")), Dialog.accept)
        QtCore.QObject.connect(self.buttonBox, QtCore.SIGNAL(_fromUtf8("rejected()")), Dialog.reject)
        QtCore.QMetaObject.connectSlotsByName(Dialog)

    def retranslateUi(self, Dialog):
        Dialog.setWindowTitle(QtGui.QApplication.translate("Dialog", "Dialog", None, QtGui.QApplication.UnicodeUTF8))
        self.tabWidget_5.setTabText(self.tabWidget_5.indexOf(self.tab_9), QtGui.QApplication.translate("Dialog", "Tab 9", None, QtGui.QApplication.UnicodeUTF8))
        self.tabWidget_5.setTabText(self.tabWidget_5.indexOf(self.tab_10), QtGui.QApplication.translate("Dialog", "Tab 10", None, QtGui.QApplication.UnicodeUTF8))
        self.tabWidget_4.setTabText(self.tabWidget_4.indexOf(self.tab_7), QtGui.QApplication.translate("Dialog", "Tab 7", None, QtGui.QApplication.UnicodeUTF8))
        self.tabWidget_4.setTabText(self.tabWidget_4.indexOf(self.tab_8), QtGui.QApplication.translate("Dialog", "Tab 8", None, QtGui.QApplication.UnicodeUTF8))
        self.tabWidget_3.setTabText(self.tabWidget_3.indexOf(self.tab_5), QtGui.QApplication.translate("Dialog", "Tab 5", None, QtGui.QApplication.UnicodeUTF8))
        self.tabWidget_3.setTabText(self.tabWidget_3.indexOf(self.tab_6), QtGui.QApplication.translate("Dialog", "Tab 6", None, QtGui.QApplication.UnicodeUTF8))
        self.tabWidget_2.setTabText(self.tabWidget_2.indexOf(self.tab_3), QtGui.QApplication.translate("Dialog", "Tab 3", None, QtGui.QApplication.UnicodeUTF8))
        self.tabWidget_2.setTabText(self.tabWidget_2.indexOf(self.tab_4), QtGui.QApplication.translate("Dialog", "Tab 4", None, QtGui.QApplication.UnicodeUTF8))
        self.tabWidget.setTabText(self.tabWidget.indexOf(self.tab), QtGui.QApplication.translate("Dialog", "Tab 1", None, QtGui.QApplication.UnicodeUTF8))
        self.tabWidget.setTabText(self.tabWidget.indexOf(self.tab_2), QtGui.QApplication.translate("Dialog", "Tab 2", None, QtGui.QApplication.UnicodeUTF8))
#
#------------------------------------------------------------------------------ 
#
#  For Testing
#
        self.tab_33 = QtGui.QWidget()
        self.tabWidget.addTab(self.tab_33, "Hell")
        QColor = QtGui.QColor(255, 85, 0)
        a = self.tabWidget.tabBar()
        a.setTabTextColor(0, QColor)


if __name__ == "__main__":
    import sys
    app = QtGui.QApplication(sys.argv)
    Dialog = QtGui.QDialog()
    ui = Ui_Dialog()
    ui.setupUi(Dialog)
    Dialog.show()
    sys.exit(app.exec_())

回答1:

You may use qt style sheets to customize look of QTabWidget:

http://doc.qt.digia.com/4.7-snapshot/stylesheet-examples.html#customizing-qtabwidget-and-qtabbar

e.g.:

self.tabwidget.setStyleSheet('QTabBar::tab {background-color: red;}')

回答2:

Create a subclass of QTabBar and re-colour the tabs in a reimplemented paintEvent function.

Then use QTabWidget.setTabBar to replace the default tab-bar.

Here's a simple demo:

from PyQt4 import QtGui

class TabBar(QtGui.QTabBar):
    def paintEvent(self, event):
        painter = QtGui.QStylePainter(self)
        option = QtGui.QStyleOptionTab()
        for index in range(self.count()):
            self.initStyleOption(option, index)
            bgcolor = QtGui.QColor(self.tabText(index))
            option.palette.setColor(QtGui.QPalette.Window, bgcolor)
            painter.drawControl(QtGui.QStyle.CE_TabBarTabShape, option)
            painter.drawControl(QtGui.QStyle.CE_TabBarTabLabel, option)

class Window(QtGui.QTabWidget):
    def __init__(self):
        QtGui.QTabWidget.__init__(self)
        self.setTabBar(TabBar(self))
        for color in 'tomato orange yellow lightgreen skyblue plum'.split():
            self.addTab(QtGui.QWidget(self), color)

if __name__ == '__main__':

    import sys
    app = QtGui.QApplication(sys.argv)
    window = Window()
    window.resize(420, 200)
    window.show()
    sys.exit(app.exec_())

UPDATE

It seems that this technique won't work if the platform's theming engine uses pixmaps rather than palettes to colour the background. Apparently, the Windows and Mac styles use pixmaps, so colouring the background of individual tabs is much more difficult (of course, a stylesheet can be used to change the colour of all the tabs at once, but that is not relevant to the current question).

For more details, see this Qt FAQ.