def cursorForX(x: Int): Either[Side, Int] = {
    var lastX = 0

    if(x < 0)
      return Left(Side.Before)

    for(pos <- 1 to textLength) {
      val thisX = style.font.metrics.charsWidth(text, 0, pos)
      if(x <= thisX)
        return if(x < lastX+(thisX-lastX)/2) Right(pos-1) else Right(pos)
      lastX = thisX
    }
    return Left(Side.After)
  }