Method update

src/query.cpp:1657–1762

update screen periodically and display more data when data becomes available

// update screen periodically and display more data when data becomes available
bool Query::update()
{
  int begin = rows_;

  // fetch viewable portion plus one up to two screenfuls more
  fetch(row_ - (row_ % Screen::rows) + 2 * Screen::rows);

  int end = rows_ + append_;

  // display the viewable portion when updated
  if (end > begin && begin < row_ + maxrows_ - 2)
  {
    Screen::normal();

    if (begin + maxrows_ - 2 > end)
      begin = end - maxrows_ + 2;
    if (begin < 0)
      begin = 0;
    if (begin < row_)
      begin = row_;

    for (int i = begin; i < std::min(end, row_ + maxrows_ - 2); ++i)
      disp(i);
  }

  if (error_ == -1)
  {
    if (tick_ < 8 && end < row_ + maxrows_ - 2)
    {
      int row = end - row_ + 1;

      // no dots and clear below when we hit eof
      if (eof_)
        tick_ = 4;

      Screen::setpos(row, 0);
      if (tick_ < 4)
      {
        Screen::normal();
        if (tick_ == 0)
          Screen::erase();
        else
          Screen::put(&"..."[3 - tick_]);
      }
      else if (tick_ == 4)
      {
        // clear elipsis and below
        if (flag_split)
        {
          if (eof_)
          {
            redraw();
          }
          else
          {
            // clear top half below last row
            for (int i = rows_; i < maxrows_ - 1; ++i)
              disp(i);