getTextPositionBelow method

@override TextPosition getTextPositionBelow(TextPosition position)

Returns the TextPosition below the given offset into the text.

If the offset is already on the last line, the offset of the last character will be returned.

Implementation

@override
TextPosition getTextPositionBelow(TextPosition position) {
  final child = childAtPosition(position);
  final localPosition =
      TextPosition(offset: position.offset - child.node.documentOffset);

  TextPosition? newPosition = child.getPositionBelow(localPosition);

  if (newPosition == null) {
    // There was no text above in the current child, check the direct
    // sibling.
    final sibling = childAfter(child);
    if (sibling == null) {
      // reached beginning of the document, move to the
      // last character
      newPosition = TextPosition(offset: _document.length - 1);
    } else {
      final caretOffset = child.getOffsetForCaret(localPosition);
      const textPosition = TextPosition(offset: 0);
      final textOffset = sibling.getOffsetForCaret(textPosition);
      final finalOffset = Offset(caretOffset.dx, textOffset.dy);
      final siblingPosition = sibling.getPositionForOffset(finalOffset);
      newPosition = TextPosition(
          offset: sibling.node.documentOffset + siblingPosition.offset);
    }
  } else {
    newPosition =
        TextPosition(offset: child.node.documentOffset + newPosition.offset);
  }
  return newPosition;
}