from PyQt4 import QtCore, QtGui


class StatusWidgetBar(QtGui.QComboBox):
    def __init__(self, parent=None):
        super(StatusWidgetBar, self).__init__(parent)
        self.setToolTip('status (click to edit)')
        self.addItems(['waiting', 'in progress', 'finished'])

    def paintEvent(self, event):
        super(StatusWidgetBar, self).paintEvent(event)
        painter = QtGui.QPainter(self)
        progressBarStyleOption = QtGui.QStyleOptionProgressBar()
        progressBarStyleOption.rect = QtCore.QRect(0, 0, (self.width()), self.height())
        progressBarStyleOption.minimum = 0
        progressBarStyleOption.maximum = self.count()
        progressBarStyleOption.textAlignment = QtCore.Qt.AlignCenter
        progressBarStyleOption.progress = self.currentIndex()
        progressBarStyleOption.textVisible = True
        painter.setOpacity(0.5)
        QtGui.qApp.style().drawControl(QtGui.QStyle.CE_ProgressBar, progressBarStyleOption, painter)


app = QtGui.QApplication([])
w = StatusWidgetBar()
w.show()
app.exec_()