def decoration(self):
        """ The displayed icon.

            Shows open icon when node was visited (children are fetched). This allows users
            for instance to collapse a directory node but still see that it was visited, which
            may be useful if there is a huge list of directories.
        """
        rtiIconFactory = RtiIconFactory.singleton()

        if self._exception:
            return rtiIconFactory.getIcon(rtiIconFactory.ERROR, isOpen=False,
                                          color=rtiIconFactory.COLOR_ERROR)
        else:
            return rtiIconFactory.getIcon(self.iconGlyph, isOpen=not self.canFetchChildren(),
                                          color=self.iconColor)
The displayed icon.

            Shows open icon when node was visited (children are fetched). This allows users
            for instance to collapse a directory node but still see that it was visited, which
            may be useful if there is a huge list of directories.