Constructs a new Granite.MessageDialog. See Granite.Dialog for more details.
| primary_text |
the title of the dialog |
| secondary_text |
the body of the dialog |
| image_icon |
the GLib.Icon that is displayed on the left side of the dialog |
| buttons |
the Gtk.ButtonsType value that decides what buttons to use, defaults to Gtk.ButtonsType.CLOSE, see Granite.MessageDialog.buttons on details and what values are accepted |