menu/m_item_vis.c

/****************************************************************************
 * Copyright 2020,2021 Thomas E. Dickey                                     *
 * Copyright 1998-2004,2010 Free Software Foundation, Inc.                  *
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/****************************************************************************
 *   Author:  Juergen Pfeifer, 1995,1997                                    *
 ****************************************************************************/

/***************************************************************************
* Module m_item_vis                                                        *
* Tell if menu item is visible                                             *
***************************************************************************/

#include "menu.priv.h"

MODULE_ID("$Id: m_item_vis.c,v 1.20 2021/06/17 21:20:30 tom Exp $")

/*---------------------------------------------------------------------------
|   Facility      :  libnmenu
|   Function      :  bool item_visible(const ITEM *item)
|
|   Description   :  A item is visible if it currently appears in the
|                    subwindow of a posted menu.
|
|   Return Values :  TRUE  if visible
|                    FALSE if invisible
+--------------------------------------------------------------------------*/
MENU_EXPORT(bool)
item_visible(const ITEM *item)
{
  MENU *menu;

  T((T_CALLED("item_visible(%p)"), (const void *)item));
  if (item &&
      (menu = item->imenu) &&
      (menu->status & _POSTED) &&
      ((menu->toprow + menu->arows) > (item->y)) &&
      (item->y >= menu->toprow))
    returnBool(TRUE);
  else
    returnBool(FALSE);
}

/* m_item_vis.c ends here */