def scroll_forward(event, half=False):
 w = _current_window_for_event(event)
 b = event.cli.current_buffer
 if (w and w.render_info):
  info = w.render_info
  ui_content = info.ui_content
  scroll_height = info.window_height
  if half:
   scroll_height //= 2
  y = (b.document.cursor_position_row + 1)
  height = 0
  while (y < ui_content.line_count):
   line_height = info.get_height_for_line(y)
   if ((height + line_height) < scroll_height):
    height += line_height
    y += 1
   else:
    break
  b.cursor_position = b.document.translate_row_col_to_index(y, 0)

def scroll_forward ( event , half = False ) : w = _current_window_for_event ( event ) b = event . cli . current_buffer if ( w and w . render_info ) : info = w . render_info ui_content = info . ui_content scroll_height = info . window_height if half : scroll_height //= 2 y = ( b . document . cursor_position_row + 1 ) height = 0 while ( y < ui_content . line_count ) : line_height = info . get_height_for_line ( y ) if ( ( height + line_height ) < scroll_height ) : height += line_height y += 1 else : break b . cursor_position = b . document . translate_row_col_to_index ( y , 0 )
scroll window down .