payloads/libpayload/curses/menu/m_format.c

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  28
  29 /****************************************************************************
  30  *   Author:  Juergen Pfeifer, 1995,1997                                    *
  31  ****************************************************************************/
  32
  33 /***************************************************************************
  34 * Module m_format                                                          *
  35 * Set and get maximum numbers of rows and columns in menus                 *
  36 ***************************************************************************/
  37
  38 #include "menu.priv.h"
  39
  40 MODULE_ID("$Id: m_format.c,v 1.16 2010/01/23 21:20:10 tom Exp $")
  41
  42 #define minimum(a,b) ((a)<(b) ? (a): (b))
  43
  44 /*---------------------------------------------------------------------------
  45 |   Facility      :  libnmenu
  46 |   Function      :  int set_menu_format(MENU *menu, int rows, int cols)
  47 |
  48 |   Description   :  Sets the maximum number of rows and columns of items
  49 |                    that may be displayed at one time on a menu. If the
  50 |                    menu contains more items than can be displayed at
  51 |                    once, the menu will be scrollable.
  52 |
  53 |   Return Values :  E_OK                   - success
  54 |                    E_BAD_ARGUMENT         - invalid values passed
  55 |                    E_NOT_CONNECTED        - there are no items connected
  56 |                    E_POSTED               - the menu is already posted
  57 +--------------------------------------------------------------------------*/
  58 NCURSES_EXPORT(int)
  59 set_menu_format(MENU * menu, int rows, int cols)
  60 {
  61   int total_rows, total_cols;
  62
  63   T((T_CALLED("set_menu_format(%p,%d,%d)"), (void *)menu, rows, cols));
  64
  65   if (rows < 0 || cols < 0)
  66     RETURN(E_BAD_ARGUMENT);
  67
  68   if (menu)
  69     {
  70       if (menu->status & _POSTED)
  71         RETURN(E_POSTED);
  72
  73       if (!(menu->items))
  74         RETURN(E_NOT_CONNECTED);
  75
  76       if (rows == 0)
  77         rows = menu->frows;
  78       if (cols == 0)
  79         cols = menu->fcols;
  80
  81       if (menu->pattern)
  82         Reset_Pattern(menu);
  83
  84       menu->frows = rows;
  85       menu->fcols = cols;
  86
  87       assert(rows > 0 && cols > 0);
  88       total_rows = (menu->nitems - 1) / cols + 1;
  89       total_cols = (menu->opt & O_ROWMAJOR) ?
  90         minimum(menu->nitems, cols) :
  91         (menu->nitems - 1) / total_rows + 1;
  92
  93       menu->rows = total_rows;
  94       menu->cols = total_cols;
  95       menu->arows = minimum(total_rows, rows);
  96       menu->toprow = 0;
  97       menu->curitem = *(menu->items);
  98       assert(menu->curitem);
  99       menu->status |= _LINK_NEEDED;
 100       _nc_Calculate_Item_Length_and_Width(menu);
 101     }
 102   else
 103     {
 104       if (rows > 0)
 105         _nc_Default_Menu.frows = rows;
 106       if (cols > 0)
 107         _nc_Default_Menu.fcols = cols;
 108     }
 109
 110   RETURN(E_OK);
 111 }
 112
 113 /*---------------------------------------------------------------------------
 114 |   Facility      :  libnmenu
 115 |   Function      :  void menu_format(const MENU *menu, int *rows, int *cols)
 116 |
 117 |   Description   :  Returns the maximum number of rows and columns that may
 118 |                    be displayed at one time on menu.
 119 |
 120 |   Return Values :  -
 121 +--------------------------------------------------------------------------*/
 122 NCURSES_EXPORT(void)
 123 menu_format(const MENU * menu, int *rows, int *cols)
 124 {
 125   if (rows)
 126     *rows = Normalize_Menu(menu)->frows;
 127   if (cols)
 128     *cols = Normalize_Menu(menu)->fcols;
 129 }
 130
 131 /* m_format.c ends here */