
/***************************************************************************
*                            COPYRIGHT NOTICE                              *
****************************************************************************
*                ncurses is copyright (C) 1992-1995                        *
*                          Zeyd M. Ben-Halim                               *
*                          zmbenhal@netcom.com                             *
*                          Eric S. Raymond                                 *
*                          esr@snark.thyrsus.com                           *
*                                                                          *
*        Permission is hereby granted to reproduce and distribute ncurses  *
*        by any means and for any fee, whether alone or as part of a       *
*        larger distribution, in source or in binary form, PROVIDED        *
*        this notice is included with any such distribution, and is not    *
*        removed from any of its header files. Mention of ncurses in any   *
*        applications linked with it is highly appreciated.                *
*                                                                          *
*        ncurses comes AS IS with no warranty, implied or expressed.       *
*                                                                          *
***************************************************************************/

/***************************************************************************
* Module menu_format                                                       *
* Set and get maximum numbers of rows and columns in menus                 *
***************************************************************************/

#include "menu.priv.h"

#define minimum(a,b) ((a)<(b) ? (a): (b))

/*---------------------------------------------------------------------------
|   Facility      :  libnmenu  
|   Function      :  int set_menu_format(MENU *menu, int rows, int cols)
|   
|   Description   :  Sets the maximum number of rows and columns of items
|                    that may be displayed at one time on a menu. If the
|                    menu contains more items than can be displayed at
|                    once, the menu will be scrollable.
|
|   Return Values :  E_OK                   - success
|                    E_BAD_ARGUMENT         - invalid values passed
|                    E_NOT_CONNECTED        - there are no items connected
|                    E_POSTED               - the menu is already posted
|
+--------------------------------------------------------------------------*/
int set_menu_format(MENU *menu, int rows, int cols)
{
    int total_rows, total_cols;
  
    if (rows<0 || cols<0) 
	RETURN(E_BAD_ARGUMENT);

    if (menu)
    {
	ASSERT_NOT_POSTED( menu );
    
	if (!(menu->items))
	    RETURN(E_NOT_CONNECTED);

	if (rows==0) 
	    rows = menu->frows;
	if (cols==0) 
	    cols = menu->fcols;
    
	if (menu->pattern)
	{
	    RESET_PATTERN(menu);
	}
    
	menu->frows = rows;
	menu->fcols = cols;
    
	assert(rows>0 && cols>0);
	total_rows = (menu->nitems - 1)/cols + 1;
	total_cols = (menu->status & O_ROWMAJOR) ? 
	    minimum(menu->nitems,cols) :
	(menu->nitems-1)/total_rows + 1;
    
	menu->rows    = total_rows;
	menu->cols    = total_cols;
	menu->height  = minimum(total_rows,rows); 
	menu->toprow  = 0;	
	menu->curitem = *(menu->items);
	assert(menu->curitem);
	menu->status |= _LINK_NEEDED;
	_nc_Calculate_Item_Length_and_Width(menu);
    }
    else
    {
	if (rows>0) _nc_Default_Menu.frows = rows;
	if (cols>0) _nc_Default_Menu.fcols = cols;
    }
  
    RETURN(E_OK);
}


/*---------------------------------------------------------------------------
|   Facility      :  libnmenu  
|   Function      :  void menu_format(const MENU *menu, int *rows, int *cols)
|   
|   Description   :  Returns the maximum number of rows and columns that may
|                    be displayed at one time on menu.
|
|   Return Values :  -
|
+--------------------------------------------------------------------------*/
void menu_format(const MENU *menu, int *rows, int *cols)
{
    if (rows)
	*rows = menu ? menu->frows : _nc_Default_Menu.frows;
    if (cols)
	*cols = menu ? menu->fcols : _nc_Default_Menu.fcols;
}

/* menu_format.c ends here */
