-
-#define GTK_PREVIEW(obj) GTK_CHECK_CAST (obj, gtk_preview_get_type (), GtkPreview)
-#define GTK_PREVIEW_CLASS(klass) GTK_CHECK_CLASS_CAST (klass, gtk_preview_get_type (), GtkPreviewClass)
-#define GTK_IS_PREVIEW(obj) GTK_CHECK_TYPE (obj, gtk_preview_get_type ())
+#define GTK_TYPE_PREVIEW (gtk_preview_get_type ())
+#define GTK_PREVIEW(obj) (GTK_CHECK_CAST ((obj), GTK_TYPE_PREVIEW, GtkPreview))
+#define GTK_PREVIEW_CLASS(klass) (GTK_CHECK_CLASS_CAST ((klass), GTK_TYPE_PREVIEW, GtkPreviewClass))
+#define GTK_IS_PREVIEW(obj) (GTK_CHECK_TYPE ((obj), GTK_TYPE_PREVIEW))
+#define GTK_IS_PREVIEW_CLASS(klass) (GTK_CHECK_CLASS_TYPE ((klass), GTK_TYPE_PREVIEW))
+#define GTK_PREVIEW_GET_CLASS(obj) (GTK_CHECK_GET_CLASS ((obj), GTK_TYPE_PREVIEW, GtkPreviewClass))