Initializes the Widget ui.

def __initialize_ui(self):
        """
        Initializes the Widget ui.
        """

        LOGGER.debug("> Initializing Application toolBar!")

        self.setIconSize(QSize(UiConstants.default_toolbar_icon_size, UiConstants.default_toolbar_icon_size))
        self.setAllowedAreas(Qt.TopToolBarArea)
        self.setFloatable(False)
        self.setMovable(False)
        self.set_layout_default_geometry()

        self.setObjectName("toolBar")
        self.setWindowTitle("{0} - toolBar".format(Constants.application_name))

        self.set_toolbar_children_widgets()

        # Signals / Slots.
        self.__container.layouts_manager.layout_stored.connect(self.__layouts_manager__layout_stored)
        self.__container.layouts_manager.layout_restored.connect(self.__layouts_manager__layout_restored)