selectWordEdge method
Move the selection to the beginning or end of a word.
Implementation
void selectWordEdge({required SelectionChangedCause cause}) {
_computeTextMetricsIfNeeded();
assert(_lastTapDownPosition != null);
final TextPosition position = _textPainter.getPositionForOffset(
globalToLocal(_lastTapDownPosition! - _paintOffset));
final TextRange word = _textPainter.getWordBoundary(position);
late TextSelection newSelection;
if (position.offset <= word.start) {
newSelection = TextSelection.collapsed(offset: word.start);
} else {
newSelection = TextSelection.collapsed(
offset: word.end, affinity: TextAffinity.upstream);
}
_setSelection(newSelection, cause);
}