getSelectedText method

String getSelectedText(List<String> lines)

Extracts the selected text from rendered content lines.

lines should be the full content lines (not just visible), in order. Selection coordinates are in content space.

Implementation

String getSelectedText(List<String> lines) {
  if (!hasSelection) return '';

  final s = _selectionStart!;
  final e = _selectionEnd!;

  final startY = math.min(s.y, e.y);
  final endY = math.max(s.y, e.y);

  if (startY < 0 || endY >= lines.length) return '';

  final sb = StringBuffer();
  for (var y = startY; y <= endY; y++) {
    final line = lines[y];
    final plain = Style.stripAnsi(line);

    int startX, endX;
    if (startY == endY) {
      startX = math.min(s.x, e.x);
      endX = math.max(s.x, e.x);
    } else if (y == startY) {
      startX = s.y < e.y ? s.x : e.x;
      endX = Style.visibleLength(plain);
    } else if (y == endY) {
      startX = 0;
      endX = s.y < e.y ? e.x : s.x;
    } else {
      startX = 0;
      endX = Style.visibleLength(plain);
    }

    final maxX = Style.visibleLength(plain);
    startX = startX.clamp(0, maxX);
    endX = endX.clamp(0, maxX);

    if (startX < endX) {
      sb.write(cutAnsiByCells(plain, startX, endX));
    }
    if (y < endY) {
      sb.write('\n');
    }
  }

  return sb.toString();
}