release/src/router/libncurses/menu/m_item_vis.c

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  28
  29 /****************************************************************************
  30  *   Author:  Juergen Pfeifer, 1995,1997                                    *
  31  ****************************************************************************/
  32
  33 /***************************************************************************
  34 * Module m_item_vis                                                        *
  35 * Tell if menu item is visible                                             *
  36 ***************************************************************************/
  37
  38 #include "menu.priv.h"
  39
  40 MODULE_ID("$Id: m_item_vis.c,v 1.16 2010/01/23 21:20:10 tom Exp $")
  41
  42 /*---------------------------------------------------------------------------
  43 |   Facility      :  libnmenu
  44 |   Function      :  bool item_visible(const ITEM *item)
  45 |
  46 |   Description   :  A item is visible if it currently appears in the
  47 |                    subwindow of a posted menu.
  48 |
  49 |   Return Values :  TRUE  if visible
  50 |                    FALSE if invisible
  51 +--------------------------------------------------------------------------*/
  52 NCURSES_EXPORT(bool)
  53 item_visible(const ITEM * item)
  54 {
  55   MENU *menu;
  56
  57   T((T_CALLED("item_visible(%p)"), (const void *)item));
  58   if (item &&
  59       (menu = item->imenu) &&
  60       (menu->status & _POSTED) &&
  61       ((menu->toprow + menu->arows) > (item->y)) &&
  62       (item->y >= menu->toprow))
  63     returnBool(TRUE);
  64   else
  65     returnBool(FALSE);
  66 }
  67
  68 /* m_item_vis.c ends here */