setAsciiCells method

void setAsciiCells(int start, String text, int textStart, int count, CursorStyle style,)

Implementation

void setAsciiCells(
  int start,
  String text,
  int textStart,
  int count,
  CursorStyle style,
) {
  assert(start >= 0 && start + count <= _length);
  assert(textStart >= 0 && textStart + count <= text.length);
  if (count <= 0) return;

  _ensureCapacity(start + count - 1);
  clearWideCellAt(start, style);
  clearWideCellAt(start + count - 1, style);

  final foreground = style.foreground;
  final background = style.background;
  final attributes = style.attrs |
      (style.hyperlinkId << CellAttr.hyperlinkShift) |
      style.semanticAttrs;
  for (var offset = 0; offset < count; offset++) {
    final cellOffset = (start + offset) * _cellSize;
    final codeUnit = text.codeUnitAt(textStart + offset);
    // Callers must have established that every unit occupies exactly one
    // cell - see `ByteConsumer.printableTextRunLength`, which is where the
    // run this writes comes from.
    assert(isSingleCellPrintable(codeUnit));
    _data[cellOffset + _cellForeground] = foreground;
    _data[cellOffset + _cellBackground] = background;
    _data[cellOffset + _cellAttributes] = attributes;
    _data[cellOffset + _cellContent] =
        codeUnit | (1 << CellContent.widthShift);
  }

  final end = start + count;
  if (_combiningCharacters case final combiningCharacters?
      when combiningCharacters.isNotEmpty) {
    combiningCharacters.removeWhere(
      (index, _) => index >= start && index < end,
    );
  }
  if (style.underlineColor == 0) {
    if (_underlineColors case final underlineColors?
        when underlineColors.isNotEmpty) {
      underlineColors.removeWhere(
        (index, _) => index >= start && index < end,
      );
    }
    return;
  }
  for (var index = start; index < end; index++) {
    _mutableUnderlineColors[index] = style.underlineColor;
  }
}