payloads/libpayload/curses/menu/m_item_top.c

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  28
  29 /****************************************************************************
  30  *   Author:  Juergen Pfeifer, 1995,1997                                    *
  31  ****************************************************************************/
  32
  33 /***************************************************************************
  34 * Module m_item_top                                                        *
  35 * Set and get top menus item                                               *
  36 ***************************************************************************/
  37
  38 #include "menu.priv.h"
  39
  40 MODULE_ID("$Id: m_item_top.c,v 1.11 2010/01/23 21:20:10 tom Exp $")
  41
  42 /*---------------------------------------------------------------------------
  43 |   Facility      :  libnmenu
  44 |   Function      :  int set_top_row(MENU *menu, int row)
  45 |
  46 |   Description   :  Makes the specified row the top row in the menu
  47 |
  48 |   Return Values :  E_OK             - success
  49 |                    E_BAD_ARGUMENT   - not a menu pointer or invalid row
  50 |                    E_NOT_CONNECTED  - there are no items for the menu
  51 +--------------------------------------------------------------------------*/
  52 NCURSES_EXPORT(int)
  53 set_top_row(MENU * menu, int row)
  54 {
  55   ITEM *item;
  56
  57   T((T_CALLED("set_top_row(%p,%d)"), (void *)menu, row));
  58
  59   if (menu)
  60     {
  61       if (menu->status & _IN_DRIVER)
  62         RETURN(E_BAD_STATE);
  63       if (menu->items == (ITEM **) 0)
  64         RETURN(E_NOT_CONNECTED);
  65
  66       if ((row < 0) || (row > (menu->rows - menu->arows)))
  67         RETURN(E_BAD_ARGUMENT);
  68     }
  69   else
  70     RETURN(E_BAD_ARGUMENT);
  71
  72   if (row != menu->toprow)
  73     {
  74       if (menu->status & _LINK_NEEDED)
  75         _nc_Link_Items(menu);
  76
  77       item = menu->items[(menu->opt & O_ROWMAJOR) ? (row * menu->cols) : row];
  78       assert(menu->pattern);
  79       Reset_Pattern(menu);
  80       _nc_New_TopRow_and_CurrentItem(menu, row, item);
  81     }
  82
  83   RETURN(E_OK);
  84 }
  85
  86 /*---------------------------------------------------------------------------
  87 |   Facility      :  libnmenu
  88 |   Function      :  int top_row(const MENU *)
  89 |
  90 |   Description   :  Return the top row of the menu
  91 |
  92 |   Return Values :  The row number or ERR if there is no row
  93 +--------------------------------------------------------------------------*/
  94 NCURSES_EXPORT(int)
  95 top_row(const MENU * menu)
  96 {
  97   T((T_CALLED("top_row(%p)"), (const void *)menu));
  98   if (menu && menu->items && *(menu->items))
  99     {
 100       assert((menu->toprow >= 0) && (menu->toprow < menu->rows));
 101       returnCode(menu->toprow);
 102     }
 103   else
 104     returnCode(ERR);
 105 }
 106
 107 /* m_item_top.c ends here */