Amiga Plus 2002 #11/Amiga Plus CD - 2002 - No. 11.iso/Tools/Development/ncurses-5.3/menu/m_opts.c

C/C++ Source or Header | 2002-10-27 | 7.0 KB | 176 lines

/****************************************************************************
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/****************************************************************************
 *   Author:  Juergen Pfeifer, 1995,1997                                    *
 *   Contact: http://www.familiepfeifer.de/Contact.aspx?Lang=en             *
 ****************************************************************************/

/***************************************************************************
* Module m_opts                                                            *
* Menus option routines                                                    *
***************************************************************************/

#include "menu.priv.h"

MODULE_ID("$Id: m_opts.c,v 1.14 2002/07/06 15:22:16 juergen Exp $")

/*---------------------------------------------------------------------------
|   Facility      :  libnmenu
|   Function      :  int set_menu_opts(MENU *menu, Menu_Options opts)
|
|   Description   :  Set the options for this menu. If the new settings
|                    end up in a change of the geometry of the menu, it
|                    will be recalculated. This operation is forbidden if
|                    the menu is already posted.
|
|   Return Values :  E_OK           - success
|                    E_BAD_ARGUMENT - invalid menu options
|                    E_POSTED       - menu is already posted
+--------------------------------------------------------------------------*/
NCURSES_EXPORT(int)
set_menu_opts (MENU * menu, Menu_Options opts)
{
  opts &= ALL_MENU_OPTS;

  if (opts & ~ALL_MENU_OPTS)
    RETURN(E_BAD_ARGUMENT);

  if (menu)
    {
      if ( menu->status & _POSTED )
    RETURN(E_POSTED);

      if ( (opts&O_ROWMAJOR) != (menu->opt&O_ROWMAJOR))
    {
      /* we need this only if the layout really changed ... */
      if (menu->items && menu->items[0])
        {
          menu->toprow  = 0;
          menu->curitem = menu->items[0];
          assert(menu->curitem);
          set_menu_format( menu, menu->frows, menu->fcols );
        }
    }

      menu->opt = opts;

      if (opts & O_ONEVALUE)
    {
      ITEM **item;

      if ( ((item=menu->items) != (ITEM**)0) )
        for(;*item;item++)
          (*item)->value = FALSE;
    }

      if (opts & O_SHOWDESC)    /* this also changes the geometry */
    _nc_Calculate_Item_Length_and_Width( menu );
    }
  else
    _nc_Default_Menu.opt = opts;

  RETURN(E_OK);
}

/*---------------------------------------------------------------------------
|   Facility      :  libnmenu
|   Function      :  int menu_opts_off(MENU *menu, Menu_Options opts)
|
|   Description   :  Switch off the options for this menu. If the new settings
|                    end up in a change of the geometry of the menu, it
|                    will be recalculated. This operation is forbidden if
|                    the menu is already posted.
|
|   Return Values :  E_OK           - success
|                    E_BAD_ARGUMENT - invalid options
|                    E_POSTED       - menu is already posted
+--------------------------------------------------------------------------*/
NCURSES_EXPORT(int)
menu_opts_off (MENU *menu, Menu_Options  opts)
{
  MENU *cmenu = menu; /* use a copy because set_menu_opts must detect
                         NULL menu itself to adjust its behaviour */

  opts &= ALL_MENU_OPTS;
  if (opts & ~ALL_MENU_OPTS)
    RETURN(E_BAD_ARGUMENT);
  else
    {
      Normalize_Menu(cmenu);
      opts = cmenu->opt & ~opts;
      return set_menu_opts( menu, opts );
    }
}

/*---------------------------------------------------------------------------
|   Facility      :  libnmenu
|   Function      :  int menu_opts_on(MENU *menu, Menu_Options opts)
|
|   Description   :  Switch on the options for this menu. If the new settings
|                    end up in a change of the geometry of the menu, it
|                    will be recalculated. This operation is forbidden if
|                    the menu is already posted.
|
|   Return Values :  E_OK           - success
|                    E_BAD_ARGUMENT - invalid menu options
|                    E_POSTED       - menu is already posted
+--------------------------------------------------------------------------*/
NCURSES_EXPORT(int)
menu_opts_on (MENU * menu, Menu_Options opts)
{
  MENU *cmenu = menu; /* use a copy because set_menu_opts must detect
                         NULL menu itself to adjust its behaviour */

  opts &= ALL_MENU_OPTS;
  if (opts & ~ALL_MENU_OPTS)
    RETURN(E_BAD_ARGUMENT);
  else
    {
      Normalize_Menu(cmenu);
      opts = cmenu->opt | opts;
      return set_menu_opts(menu, opts);
    }
}

/*---------------------------------------------------------------------------
|   Facility      :  libnmenu
|   Function      :  Menu_Options menu_opts(const MENU *menu)
|
|   Description   :  Return the options for this menu.
|
|   Return Values :  Menu options
+--------------------------------------------------------------------------*/
NCURSES_EXPORT(Menu_Options)
menu_opts (const MENU *menu)
{
  return (ALL_MENU_OPTS & Normalize_Menu( menu )->opt);
}

/* m_opts.c ends here */