freebsd-dev/contrib/ncurses/menu/m_item_top.c

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/****************************************************************************
 *   Author: Juergen Pfeifer <juergen.pfeifer@gmx.net> 1995,1997            *
 ****************************************************************************/

/***************************************************************************
* Module m_item_top                                                        *
* Set and get top menus item                                               *
***************************************************************************/

#include "menu.priv.h"

MODULE_ID("$Id: m_item_top.c,v 1.5 2000/12/10 02:16:48 tom Exp $")

/*---------------------------------------------------------------------------
|   Facility      :  libnmenu  
|   Function      :  int set_top_row(MENU *menu, int row)
|   
|   Description   :  Makes the speified row the top row in the menu
|
|   Return Values :  E_OK             - success
|                    E_BAD_ARGUMENT   - not a menu pointer or invalid row
|                    E_NOT_CONNECTED  - there are no items for the menu
+--------------------------------------------------------------------------*/
NCURSES_EXPORT(int)
set_top_row (MENU * menu, int row)
{
  ITEM *item;
  
  if (menu)
    {
      if ( menu->status & _IN_DRIVER )
	RETURN(E_BAD_STATE);
      if (menu->items == (ITEM **)0)
	RETURN(E_NOT_CONNECTED);
      
      if ((row<0) || (row > (menu->rows - menu->arows)))
	RETURN(E_BAD_ARGUMENT);
    }
  else
    RETURN(E_BAD_ARGUMENT);
  
  if (row != menu->toprow)
    {
      if (menu->status & _LINK_NEEDED) 
	_nc_Link_Items(menu);
      
      item = menu->items[ (menu->opt&O_ROWMAJOR) ? (row*menu->cols) : row ];
      assert(menu->pattern);
      Reset_Pattern(menu);
      _nc_New_TopRow_and_CurrentItem(menu, row, item);
    }
  
    RETURN(E_OK);
}

/*---------------------------------------------------------------------------
|   Facility      :  libnmenu  
|   Function      :  int top_row(const MENU *)
|   
|   Description   :  Return the top row of the menu
|
|   Return Values :  The row number or ERR if there is no row
+--------------------------------------------------------------------------*/
NCURSES_EXPORT(int)
top_row (const MENU * menu)
{
  if (menu && menu->items && *(menu->items))
    {
      assert( (menu->toprow>=0) && (menu->toprow < menu->rows) );
      return menu->toprow;
    }
  else
    return(ERR);
}

/* m_item_top.c ends here */