support scrolling menu entry's text (#1539)

GRUB2/MOD_SRC/grub-2.04/include/grub/menu_viewer.h

@@ -0,0 +1,49 @@
+/* menu_viewer.h - Interface to menu viewer implementations. */
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2009  Free Software Foundation, Inc.
+ *
+ *  GRUB is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  GRUB is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef GRUB_MENU_VIEWER_HEADER
+#define GRUB_MENU_VIEWER_HEADER 1
+
+#include <grub/err.h>
+#include <grub/symbol.h>
+#include <grub/types.h>
+#include <grub/menu.h>
+#include <grub/term.h>
+
+struct grub_menu_viewer
+{
+  struct grub_menu_viewer *next;
+  void *data;
+  void (*set_chosen_entry) (int entry, void *data);
+  void (*scroll_chosen_entry) (void *data, int diren);
+  void (*print_timeout) (int timeout, void *data);
+  void (*clear_timeout) (void *data);
+  void (*fini) (void *fini);
+};
+
+void grub_menu_register_viewer (struct grub_menu_viewer *viewer);
+
+grub_err_t
+grub_menu_try_text (struct grub_term_output *term, 
+		    int entry, grub_menu_t menu, int nested);
+
+extern grub_err_t (*grub_gfxmenu_try_hook) (int entry, grub_menu_t menu,
+					    int nested);
+
+#endif /* GRUB_MENU_VIEWER_HEADER */