removeCells method

Implementation

void removeCells(int start, int count, [CursorStyle? style]) {
  assert(start >= 0 && start < _length);
  assert(count >= 0 && start + count <= _length);

  style ??= CursorStyle.empty;

  if (start + count < _length) {
    final moveStart = start * _cellSize;
    final moveEnd = (_length - count) * _cellSize;
    final moveOffset = count * _cellSize;
    _data.setRange(moveStart, moveEnd, _data, moveStart + moveOffset);
  }

  for (var i = _length - count; i < _length; i++) {
    _eraseCellRaw(i, style);
  }

  if (start > 0 && getWidth(start - 1) == 2) {
    _eraseCellRaw(start - 1, style);
  }

  // Update anchors, remove anchors that are inside the removed range.
  // Iterate backwards: disposing an anchor removes it from [_anchors].
  for (var i = _anchors.length - 1; i >= 0; i--) {
    final anchor = _anchors[i];
    if (anchor.x >= start) {
      if (anchor.x < start + count) {
        anchor.dispose();
      } else {
        anchor.reposition(anchor.x - count);
      }
    }
  }
  version++;
}