ncurses 4.2

[ncurses.git] / menu / m_item_top.c

diff --git a/menu/m_item_top.c b/menu/m_item_top.c
new file mode 100644 (file)
index 0000000..8825656
--- /dev/null
+++ b/menu/m_item_top.c
@@ -0,0 +1,102 @@
+/****************************************************************************
+ * Copyright (c) 1998 Free Software Foundation, Inc.                        *
+ *                                                                          *
+ * Permission is hereby granted, free of charge, to any person obtaining a  *
+ * copy of this software and associated documentation files (the            *
+ * "Software"), to deal in the Software without restriction, including      *
+ * without limitation the rights to use, copy, modify, merge, publish,      *
+ * distribute, distribute with modifications, sublicense, and/or sell       *
+ * copies of the Software, and to permit persons to whom the Software is    *
+ * furnished to do so, subject to the following conditions:                 *
+ *                                                                          *
+ * The above copyright notice and this permission notice shall be included  *
+ * in all copies or substantial portions of the Software.                   *
+ *                                                                          *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS  *
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF               *
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.   *
+ * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,   *
+ * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR    *
+ * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR    *
+ * THE USE OR OTHER DEALINGS IN THE SOFTWARE.                               *
+ *                                                                          *
+ * Except as contained in this notice, the name(s) of the above copyright   *
+ * holders shall not be used in advertising or otherwise to promote the     *
+ * sale, use or other dealings in this Software without prior written       *
+ * authorization.                                                           *
+ ****************************************************************************/
+
+/****************************************************************************
+ *   Author: Juergen Pfeifer <Juergen.Pfeifer@T-Online.de> 1995,1997        *
+ ****************************************************************************/
+
+/***************************************************************************
+* Module m_item_top                                                        *
+* Set and get top menus item                                               *
+***************************************************************************/
+
+#include "menu.priv.h"
+
+MODULE_ID("$Id: m_item_top.c,v 1.2 1998/02/11 12:13:50 tom Exp $")
+
+/*---------------------------------------------------------------------------
+|   Facility      :  libnmenu  
+|   Function      :  int set_top_row(MENU *menu, int row)
+|   
+|   Description   :  Makes the speified row the top row in the menu
+|
+|   Return Values :  E_OK             - success
+|                    E_BAD_ARGUMENT   - not a menu pointer or invalid row
+|                    E_NOT_CONNECTED  - there are no items for the menu
++--------------------------------------------------------------------------*/
+int set_top_row(MENU * menu, int row)
+{
+  ITEM *item;
+  
+  if (menu)
+    {
+      if ( menu->status & _IN_DRIVER )
+       RETURN(E_BAD_STATE);
+      if (menu->items == (ITEM **)0)
+       RETURN(E_NOT_CONNECTED);
+      
+      if ((row<0) || (row > (menu->rows - menu->arows)))
+       RETURN(E_BAD_ARGUMENT);
+    }
+  else
+    RETURN(E_BAD_ARGUMENT);
+  
+  if (row != menu->toprow)
+    {
+      if (menu->status & _LINK_NEEDED) 
+       _nc_Link_Items(menu);
+      
+      item = menu->items[ (menu->opt&O_ROWMAJOR) ? (row*menu->cols) : row ];
+      assert(menu->pattern);
+      Reset_Pattern(menu);
+      _nc_New_TopRow_and_CurrentItem(menu, row, item);
+    }
+  
+    RETURN(E_OK);
+}
+
+/*---------------------------------------------------------------------------
+|   Facility      :  libnmenu  
+|   Function      :  int top_row(const MENU *)
+|   
+|   Description   :  Return the top row of the menu
+|
+|   Return Values :  The row number or ERR if there is no row
++--------------------------------------------------------------------------*/
+int top_row(const MENU * menu)
+{
+  if (menu && menu->items && *(menu->items))
+    {
+      assert( (menu->toprow>=0) && (menu->toprow < menu->rows) );
+      return menu->toprow;
+    }
+  else
+    return(ERR);
+}
+
+/* m_item_top.c ends here */