getSelectionSpans method

List<InlineSpan> getSelectionSpans(TextSelection selection)

Returns the spans covered by selection, with chips as ChipSpans.

Runs of plain text become TextSpans and each chip becomes a ChipSpan carrying its value. Used to serialize a selection to the clipboard so chips copy as their value instead of their placeholder codepoint.

Implementation

List<InlineSpan> getSelectionSpans(TextSelection selection) {
  final String text = value.text;
  if (!selection.isValid) return const [];
  final int start = selection.start.clamp(0, text.length);
  final int end = selection.end.clamp(0, text.length);
  final List<InlineSpan> spans = [];
  final StringBuffer buffer = StringBuffer();
  for (int i = start; i < end; i++) {
    int codeUnit = text.codeUnitAt(i);
    if (codeUnit >= _chipStart && codeUnit <= _chipEnd) {
      if (buffer.isNotEmpty) {
        spans.add(TextSpan(text: buffer.toString()));
        buffer.clear();
      }
      T? chip = _chipMap[codeUnit - _chipStart];
      if (chip != null) {
        spans.add(ChipSpan<T>(value: chip, child: const SizedBox.shrink()));
      }
    } else {
      buffer.writeCharCode(codeUnit);
    }
  }
  if (buffer.isNotEmpty) {
    spans.add(TextSpan(text: buffer.toString()));
  }
  return spans;
}