m_global.c

ncurses 库 可能有用酒用 没用就算了 我觉得还可以用

      if (name)
	{
	  check = _nc_Calculate_Text_Width(&((*items)->name));
	}
      else
	{
	  check = _nc_Calculate_Text_Width(&((*items)->description));
	}
      if (check > width)
	width = check;
    }

  T(("calculate_actual_width %s = %d/%d",
     name ? "name" : "desc",
     width,
     name ? menu->namelen : menu->desclen));
  width += 2;			/* FIXME - need this? */
  return width;
}
#else
#define calculate_actual_width(menu, name) (name ? menu->namelen : menu->desclen)
#endif

/*---------------------------------------------------------------------------
|   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 = calculate_actual_width(menu, TRUE);
  l += menu->marklen;

  if ((menu->opt & O_SHOWDESC) && (menu->desclen > 0))
    {
      l += calculate_actual_width(menu, FALSE);
      l += 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;

  T(("_nc_CalculateItem_Length_and_Width columns %d, item %d, width %d",
     menu->cols,
     menu->itemlen,
     menu->width));
}

/*---------------------------------------------------------------------------
|   Facility      :  libnmenu  
|   Function      :  void _nc_Link_Item(MENU *menu)
|   
|   Description   :  Statically calculate for every item its four neighbors.
|                    This depends on the orientation of the menu. This
|                    static approach 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 */