m_global.c

ncurses-5.4

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

/***************************************************************************
* Module m_global                                                          *
* Globally used internal routines and the default menu and item structures *
***************************************************************************/

#include "menu.priv.h"

MODULE_ID("$Id: m_global.c,v 1.16 2003/11/08 20:53:01 tom Exp $")

static char mark[] = "-";

NCURSES_EXPORT_VAR(MENU) _nc_Default_Menu = {
  16,				  /* Nr. of chars high */
  1,				  /* Nr. of chars wide */
  16,				  /* Nr. of items high */
  1,			          /* Nr. of items wide */
  16,				  /* Nr. of formatted items high */
  1,				  /* Nr. of formatted items wide */
  16,				  /* Nr. of items high (actual) */
  0,				  /* length of widest name */
  0,				  /* length of widest description */
  1,				  /* length of mark */
  1,				  /* length of one item */
  1,                              /* Spacing for descriptor */ 
  1,                              /* Spacing for columns */
  1,                              /* Spacing for rows */
  (char *)0,			  /* buffer used to store match chars */
  0,				  /* Index into pattern buffer */
  (WINDOW *)0,			  /* Window containing entire menu */
  (WINDOW *)0,			  /* Portion of menu displayed */
  (WINDOW *)0,			  /* User's window */
  (WINDOW *)0,			  /* User's subwindow */
  (ITEM **)0,			  /* List of items */
  0,				  /* Total Nr. of items in menu */
  (ITEM *)0,			  /* Current item */
  0,				  /* Top row of menu */
  (chtype)A_REVERSE,		  /* Attribute for selection */
  (chtype)A_NORMAL,		  /* Attribute for nonselection */
  (chtype)A_UNDERLINE,		  /* Attribute for inactive */	
  ' ',  			  /* Pad character */
  (Menu_Hook)0,			  /* Menu init */
  (Menu_Hook)0,			  /* Menu term */
  (Menu_Hook)0,			  /* Item init */
  (Menu_Hook)0,			  /* Item term */
  (void *)0,			  /* userptr */
  mark,				  /* mark */
  ALL_MENU_OPTS,                  /* options */
  0			          /* status */	    
};

NCURSES_EXPORT_VAR(ITEM) _nc_Default_Item = {
  { (char *)0, 0 },		  /* name */
  { (char *)0, 0 },		  /* description */
  (MENU *)0,		          /* Pointer to parent menu */
  (char *)0,			  /* Userpointer */
  ALL_ITEM_OPTS,		  /* options */
  0,				  /* Item Nr. */
  0,				  /* y */
  0,				  /* x */
  FALSE,			  /* value */
  (ITEM *)0,		          /* left */
  (ITEM *)0,		          /* right */
  (ITEM *)0,		          /* up */
  (ITEM *)0		          /* down */
  };

/*---------------------------------------------------------------------------
|   Facility      :  libnmenu  
|   Function      :  static void ComputeMaximum_NameDesc_Lenths(MENU *menu)
|   
|   Description   :  Calculates the maximum name and description lengths
|                    of the items connected to the menu
|
|   Return Values :  -
+--------------------------------------------------------------------------*/
INLINE static void ComputeMaximum_NameDesc_Lengths(MENU * menu)
{
  unsigned MaximumNameLength        = 0;
  unsigned MaximumDescriptionLength = 0;
  ITEM **items;
  
  assert(menu && menu->items);
  for( items = menu->items; *items ; items++ )
    {
      if (items[0]->name.length > MaximumNameLength )
	MaximumNameLength  = items[0]->name.length;
      
      if (items[0]->description.length > MaximumDescriptionLength)
	MaximumDescriptionLength = items[0]->description.length;
    }
  
  menu->namelen = MaximumNameLength;
  menu->desclen = MaximumDescriptionLength;
}

/*---------------------------------------------------------------------------
|   Facility      :  libnmenu  
|   Function      :  static void ResetConnectionInfo(MENU *, ITEM **)
|   
|   Description   :  Reset all informations in the menu and the items in
|                    the item array that indicates a connection
|
|   Return Values :  -
+--------------------------------------------------------------------------*/
INLINE static void ResetConnectionInfo(MENU *menu, ITEM **items)
{
  ITEM **item;
  
  assert(menu && items);
  for(item=items; *item; item++)
    {
      (*item)->index = 0;
      (*item)->imenu = (MENU *)0;		
    }
  if (menu->pattern)
    free(menu->pattern);
  menu->pattern = (char *)0;
  menu->pindex  = 0;
  menu->items   = (ITEM **)0;
  menu->nitems  = 0;
}

/*---------------------------------------------------------------------------
|   Facility      :  libnmenu  
|   Function      :  bool _nc_Connect_Items(MENU *menu, ITEM **items)
|
|   Description   :  Connect the items in the item array to the menu.
|                    Decorate all the items with a number and a backward
|                    pointer to the menu.
|
|   Return Values :  TRUE       - successful connection
|                    FALSE      - connection failed
+--------------------------------------------------------------------------*/
NCURSES_EXPORT(bool)
_nc_Connect_Items (MENU *menu, ITEM **items)
{
  ITEM **item;
  unsigned int ItemCount = 0;
  
  if ( menu && items )
    {    
      for(item=items; *item ; item++)
	{
	  if ( (*item)->imenu )
	    {
	      /* if a item is already connected, reject connection */
	      break;
	    }
	}
      if (! (*item) )		
	/* we reached the end, so there was no connected item */
	{
	  for(item=items; *item ; item++)
	    {
	      if (menu->opt & O_ONEVALUE)
		{
		  (*item)->value = FALSE;
		}
	      (*item)->index = ItemCount++;
	      (*item)->imenu = menu;
	    }			
	}
    }
  else
    return(FALSE);
  
  if (ItemCount != 0)
    {
      menu->items  = items;
      menu->nitems = ItemCount;
      ComputeMaximum_NameDesc_Lengths(menu);
      if ( (menu->pattern = (char *)malloc( (unsigned)(1 + menu->namelen))) )
	{
	  Reset_Pattern(menu);	
	  set_menu_format(menu,menu->frows,menu->fcols);
	  menu->curitem = *items;
	  menu->toprow = 0;
	  return(TRUE);
	}
    }
  
  /* If we fall through to this point, we have to reset all items connection 
     and inform about a reject connection */
  ResetConnectionInfo( menu, items );
  return(FALSE);
}

/*---------------------------------------------------------------------------
|   Facility      :  libnmenu  
|   Function      :  void _nc_Disconnect_Items(MENU *menu)
|   
|   Description   :  Disconnect the menus item array from the menu
|
|   Return Values :  -
+--------------------------------------------------------------------------*/
NCURSES_EXPORT(void)
_nc_Disconnect_Items (MENU * menu)
{
  if (menu && menu->items)
    ResetConnectionInfo( menu, menu->items );
}

/*---------------------------------------------------------------------------
|   Facility      :  libnmenu  
|   Function      :  void _nc_Calculate_Item_Length_and_Width(MENU *menu)
|   
|   Description   :  Calculate the length of an item and the width of the
|                    whole menu.
|
|   Return Values :  -
+--------------------------------------------------------------------------*/
NCURSES_EXPORT(void)
_nc_Calculate_Item_Length_and_Width (MENU * menu)
{