ellipsize

The preferred place to ellipsize the string, if the label does not have enough room to display the entire string, specified as a EllipsizeMode.

Note that setting this property to a value other than pango_ellipsize_none has the side-effect that the label requests only enough space to display the ellipsis "...". In particular, this means that ellipsizing labels do not work well in notebook tabs, unless the Notebook tab-expand child property is set to true . Other ways to set a label's width are set_size_request and set_width_chars.