/*	$OpenBSD: m_global.c,v 1.6 2001/01/22 18:02:03 millert Exp $	*/

/****************************************************************************
 * Copyright (c) 1998,2000 Free Software Foundation, Inc.                   *
 *                                                                          *
 * Permission is hereby granted, free of charge, to any person obtaining a  *
 * copy of this software and associated documentation files (the            *
 * "Software"), to deal in the Software without restriction, including      *
 * without limitation the rights to use, copy, modify, merge, publish,      *
 * distribute, distribute with modifications, sublicense, and/or sell       *
 * copies of the Software, and to permit persons to whom the Software is    *
 * furnished to do so, subject to the following conditions:                 *
 *                                                                          *
 * The above copyright notice and this permission notice shall be included  *
 * in all copies or substantial portions of the Software.                   *
 *                                                                          *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS  *
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF               *
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.   *
 * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,   *
 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR    *
 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR    *
 * THE USE OR OTHER DEALINGS IN THE SOFTWARE.                               *
 *                                                                          *
 * Except as contained in this notice, the name(s) of the above copyright   *
 * holders shall not be used in advertising or otherwise to promote the     *
 * sale, use or other dealings in this Software without prior written       *
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 ****************************************************************************/

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

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

#include "menu.priv.h"

MODULE_ID("$From: m_global.c,v 1.12 2000/12/10 02:16:48 tom Exp $")

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 */
  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       - successfull 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)
{
  int l;
  
  assert(menu);

  menu->height  = 1 + menu->spc_rows * (menu->arows - 1);

  l = menu->namelen + menu->marklen;
  if ( (menu->opt & O_SHOWDESC) && (menu->desclen > 0) )
    l += (menu->desclen + menu->spc_desc);
  
  menu->itemlen = l;
  l *= menu->cols;
  l += (menu->cols-1)*menu->spc_cols; /* for the padding between the columns */
  menu->width = l;
}  

/*---------------------------------------------------------------------------
|   Facility      :  libnmenu  
|   Function      :  void _nc_Link_Item(MENU *menu)
|   
|   Description   :  Statically calculate for every item its four neighbours.
|                    This depends on the orientation of the menu. This
|                    static aproach simplifies navigation in the menu a lot.
|
|   Return Values :  -
+--------------------------------------------------------------------------*/
NCURSES_EXPORT(void)
_nc_Link_Items (MENU * menu)
{
  if (menu && menu->items && *(menu->items))
    {
      int i,j;
      ITEM *item;
      int Number_Of_Items = menu->nitems;
      int col = 0, row = 0;
      int Last_in_Row;
      int Last_in_Column;
      bool cycle = (menu->opt & O_NONCYCLIC) ? FALSE : TRUE;
      
      menu->status &= ~_LINK_NEEDED;
      
      if (menu->opt & O_ROWMAJOR)
	{
	  int Number_Of_Columns = menu->cols;
	  
	  for(i=0; i < Number_Of_Items; i++)
	    {
	      item = menu->items[i];
	      
	      Last_in_Row = row * Number_Of_Columns + (Number_Of_Columns-1);
	      
	      item->left  = (col) ? 
		/* if we are not in the leftmost column, we can use the
		   predecessor in the items array */
		menu->items[i-1] :
		  (cycle ? menu->items[(Last_in_Row>=Number_Of_Items) ? 
				       Number_Of_Items-1:
				       Last_in_Row] : 
		   (ITEM *)0 );
	      
	      item->right = (  (col < (Number_Of_Columns-1)) && 
			     ((i+1) < Number_Of_Items) 
			     ) ? 
			       menu->items[i+1] :
				 ( cycle ? menu->items[row * Number_Of_Columns] : 
				  (ITEM *)0
				  );
	      
	      Last_in_Column = (menu->rows-1) * Number_Of_Columns + col;
	      
	      item->up    = (row) ? menu->items[i-Number_Of_Columns] :
		(cycle ? menu->items[(Last_in_Column>=Number_Of_Items) ?
				     Number_Of_Items-1 : 
				     Last_in_Column] : 
		 (ITEM *)0);
	      
	      item->down  = ( (i+Number_Of_Columns) < Number_Of_Items ) 
		? 
		  menu->items[i + Number_Of_Columns] :
		    (cycle ? menu->items[(row+1)<menu->rows ?
					 Number_Of_Items-1:col] : 
		     (ITEM *)0);
	      item->x = col;
	      item->y = row;
	      if ( ++col == Number_Of_Columns )
		{
		  row++;
		  col = 0;
		}
	    }
	}
      else
	{
	  int Number_Of_Rows = menu->rows;
	  
	  for(j=0; j<Number_Of_Items; j++)
	    {
	      item = menu->items[i=(col * Number_Of_Rows + row)];
	      
	      Last_in_Column = (menu->cols-1) * Number_Of_Rows + row;
	      
	      item->left  = (col) ? 
		menu->items[i - Number_Of_Rows] :
		  (cycle ? (Last_in_Column >= Number_Of_Items ) ? 
		   menu->items[Last_in_Column-Number_Of_Rows] : 
		   menu->items[Last_in_Column] : 
		   (ITEM *)0 );
	      
	      item->right = ((i + Number_Of_Rows) <Number_Of_Items) 
		? 
		  menu->items[i + Number_Of_Rows] :
		    (cycle ? menu->items[row] : (ITEM *)0);
	      
	      Last_in_Row = col * Number_Of_Rows + (Number_Of_Rows - 1);
	      
	      item->up    = (row) ? 
		menu->items[i-1] :
		  (cycle ?
		   menu->items[(Last_in_Row>=Number_Of_Items) ? 
			       Number_Of_Items-1:
			       Last_in_Row] :
		   (ITEM *)0);
	      
	      item->down  = (row < (Number_Of_Rows-1)) 
		? 
		  (menu->items[((i+1)<Number_Of_Items) ? 
			       i+1 :
			       (col-1)*Number_Of_Rows + row + 1]) :
				 (cycle ?
				  menu->items[col * Number_Of_Rows] :
				  (ITEM *)0
				  );
	      
	      item->x = col;
	      item->y = row;
	      if ( (++row) == Number_Of_Rows )
		{
		  col++;
		  row = 0;
		}
	    }
	}
    }
}

/*---------------------------------------------------------------------------
|   Facility      :  libnmenu  
|   Function      :  void _nc_Show_Menu(const MENU *menu)
|   
|   Description   :  Update the window that is associated with the menu
|
|   Return Values :  -
+--------------------------------------------------------------------------*/
NCURSES_EXPORT(void)
_nc_Show_Menu (const MENU *menu)
{
  WINDOW *win;
  int maxy, maxx;
  
  assert(menu);
  if ( (menu->status & _POSTED) && !(menu->status & _IN_DRIVER) )
    {
      /* adjust the internal subwindow to start on the current top */
      assert(menu->sub);
      mvderwin(menu->sub,menu->spc_rows * menu->toprow,0);
      win = Get_Menu_Window(menu);
      
      maxy = getmaxy(win);
      maxx = getmaxx(win);	 
      
      if (menu->height < maxy) 
	maxy = menu->height;
      if (menu->width < maxx) 
	maxx = menu->width;
      
      copywin(menu->sub,win,0,0,0,0,maxy-1,maxx-1,0);
      pos_menu_cursor(menu);
    }	
}	

/*---------------------------------------------------------------------------
|   Facility      :  libnmenu  
|   Function      :  void _nc_New_TopRow_and_CurrentItem(
|                            MENU *menu, 
|                            int new_toprow, 
|                            ITEM *new_current_item)
|   
|   Description   :  Redisplay the menu so that the given row becomes the
|                    top row and the given item becomes the new current
|                    item.
|
|   Return Values :  -
+--------------------------------------------------------------------------*/
NCURSES_EXPORT(void)
_nc_New_TopRow_and_CurrentItem
(MENU *menu, int new_toprow, ITEM *new_current_item)
{
  ITEM *cur_item;
  bool mterm_called = FALSE;
  bool iterm_called = FALSE;
  
  assert(menu);
  if (menu->status & _POSTED)
    {
      if (new_current_item != menu->curitem)
	{
	  Call_Hook(menu,itemterm);
	  iterm_called = TRUE;
	}
      if (new_toprow != menu->toprow)
	{
	  Call_Hook(menu,menuterm);
	  mterm_called = TRUE;
	}			
      
      cur_item  = menu->curitem;
      assert(cur_item);
      menu->toprow  = new_toprow;
      menu->curitem = new_current_item;			
      
      if (mterm_called)
	{
	  Call_Hook(menu,menuinit);
	}
      if (iterm_called)
	{
	  /* this means, move from the old current_item to the new one... */
	  Move_To_Current_Item( menu, cur_item );
	  Call_Hook(menu,iteminit);
	}
      if (mterm_called || iterm_called)
	{
	  _nc_Show_Menu(menu);
	}
      else
	pos_menu_cursor(menu);
    }
  else
    { /* if we are not posted, this is quite simple */
      menu->toprow  = new_toprow;
      menu->curitem = new_current_item;
    }
}

/* m_global.c ends here */