
/***************************************************************************
*                            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_post                                                         *
* Write or erase menus from associated subwindows                          *
***************************************************************************/

#include "menu.priv.h"

/*---------------------------------------------------------------------------
|   Facility      :  libnmenu  
|   Function      :  void _nc_Post_Item(MENU *menu, ITEM *item)  
|   
|   Description   :  Draw the item in the menus window at the current
|                    window position 
|
|   Return Values :  -
|
+--------------------------------------------------------------------------*/
void _nc_Post_Item(const MENU * menu, const ITEM * item)
{
    int i;
    chtype ch;
    bool isfore = FALSE, isback=FALSE, isgrey = FALSE;

    assert(menu->win);

    /* First we have to calculate the attribute depending on selectability
       and selection status
       */
    if (!(item->opt & O_SELECTABLE))
    {
	wattron(menu->win,menu->grey);
	isgrey = TRUE;
    }
    else
    {
	if (item->value || item==menu->curitem)
	{
	    wattron(menu->win,menu->fore);
	    isfore = TRUE;
	}
	else
	{
	    wattron(menu->win,menu->back);
	    isback = TRUE;
	}
    }

    /* We need a marker iff
       - it is a onevalued menu and it is the current item
       - or it has a selection value
       */
    if (item->value || ((menu->opt&O_ONEVALUE) && (item==menu->curitem))	)
    {
	if (menu->marklen) 
	    waddstr(menu->win,menu->mark);
    }
    else			/* otherwise we have to wipe out the marker area */ 
	for(ch=menu->pad,i=menu->marklen;i>0;i--) 
	    waddch(menu->win,ch);
  
    waddnstr(menu->win,item->name.str,item->name.length);
    for(ch=menu->pad,i=menu->namelen-item->name.length;i>0;i--)
    {
	waddch(menu->win,ch);
    }
  
    /* Show description if required and available */
    if ( (menu->opt & O_SHOWDESC) && menu->desclen>0 )
    {
	waddch(menu->win,menu->pad);
	if (item->description.length)
	    waddnstr(menu->win,item->description.str,item->description.length);
	for(ch=menu->pad,i=menu->desclen-item->description.length; i>0; i--)
	{
	    waddch(menu->win,ch);
	}
    }
  
    /* Remove attributes */
    if (isfore)
	wattroff(menu->win,menu->fore);
    if (isback)
	wattroff(menu->win,menu->back);
    if (isgrey)
	wattroff(menu->win,menu->grey);
}	

/*---------------------------------------------------------------------------
|   Facility      :  libnmenu  
|   Function      :  void _nc_Draw_Menu(const MENU *)
|   
|   Description   :  Display the menu in its windows
|
|   Return Values :  -
|
+--------------------------------------------------------------------------*/
void _nc_Draw_Menu(const MENU * menu)
{
    ITEM *item = menu->items[0];
    ITEM *lasthor, *lastvert;
    ITEM *hitem;
    int y = 0;

    assert(item);
    assert(menu->win);

    lastvert = (menu->opt & O_NONCYCLIC) ? (ITEM *)0 : item;  

    do
    {  
	wmove(menu->win,y++,0);
    
	hitem   = item;
	lasthor = (menu->opt & O_NONCYCLIC) ? (ITEM *)0 : hitem;
    
	do
	{
	    _nc_Post_Item( menu, hitem);
	    if ( ((hitem = hitem->right) != lasthor) && hitem )
	    {
		waddch( menu->win,menu->pad);
	    }
	} while (hitem && (hitem != lasthor));
    
	item = item->down;
    
    } while( item && (item != lastvert) );	
}

/*---------------------------------------------------------------------------
|   Facility      :  libnmenu  
|   Function      :  int post_menu(MENU *)
|   
|   Description   :  Post a menu to the screen. This makes it visible.
|
|   Return Values :  E_OK                - success
|                    E_BAD_ARGUMENT      - not a valid menu pointer
|                    E_SYSTEM_ERROR      - error in lower layers
|                    E_NO_ROOM           - Menu to large for screen
|                    E_NOT_CONNECTED     - No items connected to menu
|                    E_BAD_STATE         - Menu in userexit routine
|                    E_POSTED            - Menu already posted
|
+--------------------------------------------------------------------------*/
int post_menu(MENU * menu)
{
    WINDOW *w;
    ITEM **items;
    int maxy, maxx;
    int y;
  
    if (!menu)
	RETURN(E_BAD_ARGUMENT);

    ASSERT_NOT_IN_HOOK( menu );
    ASSERT_NOT_POSTED( menu );
  
    if (menu->items && *(menu->items))
    {
	w = CDEFWIN(menu);
	maxy = getmaxy(w);
	maxx = getmaxx(w);
    
	if (maxx < menu->width || maxy < menu->height)
	    RETURN(E_NO_ROOM);
    
	if ( (menu->win = newwin(menu->rows,menu->width,0,0)) )
	{
	    y = (maxy >= menu->rows) ? menu->rows : maxy;
	    if (y>=menu->height) 
		y = menu->height;
	    if(!(menu->sub = derwin(menu->win,y,menu->width,0,0)))
		RETURN(E_SYSTEM_ERROR);
	}
	else 
	    RETURN(E_SYSTEM_ERROR);	
    
	if (menu->status & _LINK_NEEDED) 
	    _nc_Link_Items(menu);
    }
    else
	RETURN(E_NOT_CONNECTED);
  
    menu->status |= _POSTED;
    if (!(menu->opt&O_ONEVALUE))
    {
	for(items=menu->items;*items;items++)
	{
	    (*items)->value = 0;
	}
    }
  
    _nc_Draw_Menu(menu);
  
    CALL_HANDLER(menu,menuinit);
    CALL_HANDLER(menu,iteminit);
  
    _nc_Show_Menu(menu);
  
    RETURN(E_OK);
}

/*---------------------------------------------------------------------------
|   Facility      :  libnmenu  
|   Function      :  int unpost_menu(MENU *)
|   
|   Description   :  Detach menu from screen
|
|   Return Values :  E_OK              - success
|                    E_BAD_ARGUMENT    - not a valid menu pointer
|                    E_BAD_STATE       - menu in userexit routine
|                    E_NOT_POSTED      - menu is not posted
+--------------------------------------------------------------------------*/
int unpost_menu(MENU * menu)
{
    WINDOW *w;
  
    if (!menu)
	RETURN(E_BAD_ARGUMENT);

    ASSERT_NOT_IN_HOOK( menu );
    ASSERT_POSTED( menu );
  
    CALL_HANDLER(menu,itemterm);
    CALL_HANDLER(menu,menuterm);	
  
    w = CDEFWIN(menu);
    werase(w);
    wsyncup(w);
  
    assert(menu->sub);
    delwin(menu->sub);
    menu->sub = (WINDOW *)0;
  
    assert(menu->win);
    delwin(menu->win);
    menu->win = (WINDOW *)0;
  
    menu->status &= ~_POSTED;
  
    RETURN(E_OK);
}

/* menu_post.c ends here */
