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m_post.c

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

/***************************************************************************
* Module m_post                                                            *
* Write or erase menus from associated subwindows                          *
***************************************************************************/

#include "menu.priv.h"

MODULE_ID("$Id: m_post.c,v 1.19 2003/10/25 14:54:48 tom Exp $")

/*---------------------------------------------------------------------------
|   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 :  -
+--------------------------------------------------------------------------*/
NCURSES_EXPORT(void)
_nc_Post_Item (const MENU * menu, const ITEM * item)
{
  int i;
  chtype ch;
  int item_x, item_y;
  int count = 0;
  bool isfore = FALSE, isback=FALSE, isgrey = FALSE;
  
  assert(menu->win);
  
  getyx(menu->win,item_y,item_x);
  
  /* We need a marker iff
     - it is a onevalued menu and it is the current item
     - or it has a selection value
     */
  wattron(menu->win,menu->back);
  if (item->value || (item==menu->curitem))
    {
      if (menu->marklen) 
      {
        /* In a multi selection menu we use the fore attribute
           for a selected marker that is not the current one.
           This improves visualization of the menu, because now
           always the 'normal' marker denotes the current
           item. */
        if (!(menu->opt & O_ONEVALUE) && item->value && item!=menu->curitem)
          {
            wattron(menu->win,menu->fore);
            isfore = TRUE;
          }
        waddstr(menu->win,menu->mark);
        if (isfore)
          {
            wattron(menu->win,menu->fore);
            isfore = FALSE;
          }
      }
    }
  else                  /* otherwise we have to wipe out the marker area */ 
    for(ch=' ',i=menu->marklen;i>0;i--) 
      waddch(menu->win,ch);
  wattroff(menu->win,menu->back);
  count += menu->marklen;

  /* 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;
      }
    }

  waddnstr(menu->win,item->name.str,item->name.length);
  for(ch=' ',i=menu->namelen-item->name.length;i>0;i--)
    {
      waddch(menu->win,ch);
    }
  count += menu->namelen;

  /* Show description if required and available */
  if ( (menu->opt & O_SHOWDESC) && menu->desclen>0 )
    {
      int m = menu->spc_desc/2;
      int cy = -1, cx = -1;

      for(ch=' ',i=0; i < menu->spc_desc; i++)
      {
        if (i==m)
          {
            waddch(menu->win,menu->pad);
            getyx(menu->win,cy,cx);
          }
        else
          waddch(menu->win,ch);
      }
      if (item->description.length)
      waddnstr(menu->win,item->description.str,item->description.length);
      for(ch=' ',i=menu->desclen-item->description.length; i>0; i--)
      {
        waddch(menu->win,ch);
      }
      count += menu->desclen + menu->spc_desc;

      if (menu->spc_rows > 1)
      {
        int j, k, ncy, ncx;

        assert(cx>=0 && cy>=0);
        getyx(menu->win,ncy,ncx);
        if (isgrey) wattroff(menu->win,menu->grey);
        else if (isfore) wattroff(menu->win,menu->fore);
        wattron(menu->win,menu->back);
        for(j=1; j < menu->spc_rows;j++)
          {
            if ((item_y+j) < getmaxy(menu->win))
            {
              wmove (menu->win,item_y+j,item_x);
              for(k=0;k<count;k++)
                waddch(menu->win,' ');
            }
            if ((cy+j) < getmaxy(menu->win))
            mvwaddch(menu->win,cy+j,cx-1,menu->pad);
          }
        wmove(menu->win,ncy,ncx);
        if (!isback)
          wattroff(menu->win,menu->back);
      }
    }
  
  /* 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 :  -
+--------------------------------------------------------------------------*/
NCURSES_EXPORT(void)
_nc_Draw_Menu (const MENU * menu)
{
  ITEM *item = menu->items[0];
  ITEM *lasthor, *lastvert;
  ITEM *hitem;
  int y = 0;
  chtype s_bkgd;

  assert(item && menu->win);

  s_bkgd = getbkgd(menu->win);
  wbkgdset(menu->win,menu->back);
  werase(menu->win);
  wbkgdset(menu->win,s_bkgd);

  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);

        wattron(menu->win,menu->back);
        if ( ((hitem = hitem->right) != lasthor) && hitem )
          {
            int i,j, cy, cx;
            chtype ch = ' ';

            getyx(menu->win,cy,cx);
            for(j=0;j<menu->spc_rows;j++)
            {
              wmove(menu->win,cy+j,cx);
              for(i=0; i < menu->spc_cols; i++)
                {
                  waddch( menu->win,ch);
                }
            }
            wmove(menu->win,cy,cx+menu->spc_cols);
          }
      } while (hitem && (hitem != lasthor));
      wattroff(menu->win,menu->back);
      
      item = item->down;
      y += menu->spc_rows;
      
    } 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
+--------------------------------------------------------------------------*/
NCURSES_EXPORT(int)
post_menu (MENU * menu)
{
  if (!menu)
    RETURN(E_BAD_ARGUMENT);
  
  if ( menu->status & _IN_DRIVER )
    RETURN(E_BAD_STATE);

  if ( menu->status & _POSTED )
    RETURN(E_POSTED);
  
  if (menu->items && *(menu->items))
    {
      int y;
      int h = 1 + menu->spc_rows * (menu->rows - 1);

      WINDOW *win = Get_Menu_Window(menu);
      int maxy = getmaxy(win);
      int maxx = getmaxx(win);
      
      if (maxx < menu->width || maxy < menu->height)
      RETURN(E_NO_ROOM);

      if ( (menu->win = newpad(h,menu->width)) )
      {
        y = (maxy >= h) ? h : maxy;
        if (y>=menu->height) 
          y = menu->height;
        if(!(menu->sub = subpad(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))
    {
      ITEM **items;
  
      for(items=menu->items;*items;items++)
      {
        (*items)->value = FALSE;
      }
    }
  
  _nc_Draw_Menu(menu);
  
  Call_Hook(menu,menuinit);
  Call_Hook(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
+--------------------------------------------------------------------------*/
NCURSES_EXPORT(int)
unpost_menu (MENU * menu)
{
  WINDOW *win;
  
  if (!menu)
    RETURN(E_BAD_ARGUMENT);
  
  if ( menu->status & _IN_DRIVER )
    RETURN(E_BAD_STATE);

  if ( !( menu->status & _POSTED ) )
    RETURN(E_NOT_POSTED);
  
  Call_Hook(menu,itemterm);
  Call_Hook(menu,menuterm);   
  
  win = Get_Menu_Window(menu);
  werase(win);
  wsyncup(win);
  
  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);
}

/* m_post.c ends here */

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