offsetFor method

double offsetFor(
  1. int row
)

Distance from the beginning to the top of row.

Implementation

double offsetFor(int row) {
  RangeError.checkValueInInterval(row, 0, length, 'row');
  var offset = row * estimatedHeight;
  for (var index = row; index > 0; index -= index & -index) {
    offset += _tree[index];
  }
  return offset;
}