m_opts.c

ncurses-5.4

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/****************************************************************************
 *   Author:  Juergen Pfeifer, 1995,1997                                    *
 ****************************************************************************/

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

#include "menu.priv.h"

MODULE_ID("$Id: m_opts.c,v 1.16 2003/11/08 20:50:19 tom 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 behavior */

  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 behavior */

  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 */