How to use the qtawesome.icon_browser.IconModel function in QtAwesome

self.setWindowTitle('QtAwesome Icon Browser')

        qtawesome._instance()
        fontMaps = qtawesome._resource['iconic'].charmap

        iconNames = []
        for fontCollection, fontData in fontMaps.items():
            for iconName in fontData:
                iconNames.append('%s.%s' % (fontCollection, iconName))

        self._filterTimer = QtCore.QTimer(self)
        self._filterTimer.setSingleShot(True)
        self._filterTimer.setInterval(AUTO_SEARCH_TIMEOUT)
        self._filterTimer.timeout.connect(self._updateFilter)

        model = IconModel(self.palette().color(QtGui.QPalette.Text))
        model.setStringList(sorted(iconNames))

        self._proxyModel = QtCore.QSortFilterProxyModel()
        self._proxyModel.setSourceModel(model)
        self._proxyModel.setFilterCaseSensitivity(QtCore.Qt.CaseInsensitive)

        self._listView = IconListView(self)
        self._listView.setUniformItemSizes(True)
        self._listView.setViewMode(QtWidgets.QListView.IconMode)
        self._listView.setModel(self._proxyModel)
        self._listView.setContextMenuPolicy(QtCore.Qt.CustomContextMenu)
        self._listView.doubleClicked.connect(self._copyIconText)

        self._lineEdit = QtWidgets.QLineEdit(self)
        self._lineEdit.setAlignment(QtCore.Qt.AlignCenter)
        self._lineEdit.textChanged.connect(self._triggerDelayedUpdate)

"""
        Re-implemented to return the icon for the current index.

        Parameters
        ----------
        index : QtCore.QModelIndex
        role : int

        Returns
        -------
        Any
        """
        if role == QtCore.Qt.DecorationRole:
            iconString = self.data(index, role=QtCore.Qt.DisplayRole)
            return qtawesome.icon(iconString, color=self._iconColor)
        return super(IconModel, self).data(index, role)