expand.cc

initial working phase of the design of said editor, featuring multicasting, advanced linux keyboard

void term::expand( u_int cursor )
{
   line_s* lines = ( line_s* )__here;

   if( __here -> id_mask == ID_LINE_S )
   {
//      if( ( lines == s -> top &&
//      || lines -> scr -> top -> last != NULL )
      if( lines -> next == lines -> scr -> top )
	 return; // already expanded
   }
   else // not ID_LINE_S
   {
      lines = new line_s( __here ); // here is no longer here, has moved
      if( __here -> last != NULL )
      {
	 __here -> last -> next = lines;
	 if( __here -> last -> id_mask == ID_LINE_S
	 && ( ( line_s* )( __here -> last ) ) -> scr -> top == __here )
	   ( ( line_s* )( __here -> last ) ) -> scr -> top = lines;
      }
/* this is a few lines down
      if( __here -> next != NULL )
      {
	 __here -> next -> last = lines;
      }
*/
//      u_int x = _row;
//      line* top = find_top( cursor, x );
   // not deleting the old line
   }
   if( _row > 0 ) //&& top != NULL
      update_to_top( cursor, lines, __here, lines -> scr -> bot
      , __here -> last, _row - 1 );
   if( __here == s -> bot )
      s -> bot = lines -> scr -> bot;
   _here = ( u_int )lines;
   if( _row == 0 ) s -> top = __here;
   lines -> scr -> top -> last = __here;
   lines -> scr -> bot -> next = __here -> next;
//   if( _row == rows - 1 )
   if( __here -> next != NULL )
   {
      __here -> next -> last = lines -> scr -> bot;
   }
   __here -> next = lines -> scr -> top;

   _here = ( u_int )( lines -> scr -> bot );

   for_each_cursor_below( _row, &term::inc_row );

   int count = 1;
   for(; __here != lines -> scr -> top;
      _here = ( u_int )( __here -> last ), ++count )
      for_each_cursor_below( _row, &term::inc_row );
   rows += count;

   _row++;
   _pcol = _col = 0;

   repos( 0, xrow - xorig );
   if( _row - _orig == note::rows ) _orig++;

   if( _row > xorig + note::rows || _row + count <= xorig ) return;
   redraw();
}