Updates the icon to use the icon named icon_name from the current icon theme as the base background image. If icon_name is NULL, self will go back using style information or default theming for its background image.
If this method is called and a GIcon was already set as background for the icon, icon_name will be used, i.e. the last method called between NumerableIcon.setBackgroundIconName and NumerableIcon.setBackgroundGicon has always priority.
an icon name, or NULL
3.0
Updates the icon to use the icon named icon_name from the current icon theme as the base background image. If icon_name is NULL, self will go back using style information or default theming for its background image.
If this method is called and a GIcon was already set as background for the icon, icon_name will be used, i.e. the last method called between NumerableIcon.setBackgroundIconName and NumerableIcon.setBackgroundGicon has always priority.