contrib/ncurses-5.4/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 1.12 2003/10/25 14:54:48 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   if (rows<0 || cols<0)
  64     RETURN(E_BAD_ARGUMENT);
  65
  66   if (menu)
  67     {
  68       if ( menu->status & _POSTED )
  69         RETURN(E_POSTED);
  70
  71       if (!(menu->items))
  72         RETURN(E_NOT_CONNECTED);
  73
  74       if (rows==0)
  75         rows = menu->frows;
  76       if (cols==0)
  77         cols = menu->fcols;
  78
  79       if (menu->pattern)
  80         Reset_Pattern(menu);
  81
  82       menu->frows = rows;
  83       menu->fcols = cols;
  84
  85       assert(rows>0 && cols>0);
  86       total_rows = (menu->nitems - 1)/cols + 1;
  87       total_cols = (menu->status & O_ROWMAJOR) ?
  88         minimum(menu->nitems,cols) :
  89           (menu->nitems-1)/total_rows + 1;
  90
  91       menu->rows    = total_rows;
  92       menu->cols    = total_cols;
  93       menu->arows   = minimum(total_rows,rows);
  94       menu->toprow  = 0;
  95       menu->curitem = *(menu->items);
  96       assert(menu->curitem);
  97       menu->status |= _LINK_NEEDED;
  98       _nc_Calculate_Item_Length_and_Width(menu);
  99     }
 100   else
 101     {
 102       if (rows>0) _nc_Default_Menu.frows = rows;
 103       if (cols>0) _nc_Default_Menu.fcols = cols;
 104     }
 105
 106   RETURN(E_OK);
 107 }
 108
 109 /*---------------------------------------------------------------------------
 110 |   Facility      :  libnmenu
 111 |   Function      :  void menu_format(const MENU *menu, int *rows, int *cols)
 112 |
 113 |   Description   :  Returns the maximum number of rows and columns that may
 114 |                    be displayed at one time on menu.
 115 |
 116 |   Return Values :  -
 117 +--------------------------------------------------------------------------*/
 118 NCURSES_EXPORT(void)
 119 menu_format (const MENU *menu, int *rows, int *cols)
 120 {
 121   if (rows)
 122     *rows = Normalize_Menu(menu)->frows;
 123   if (cols)
 124     *cols = Normalize_Menu(menu)->fcols;
 125 }
 126
 127 /* m_format.c ends here */