EphemeralRange LocalFrame::rangeForPoint(const IntPoint& framePoint) {
const PositionWithAffinity positionWithAffinity =
positionForPoint(framePoint);
if (positionWithAffinity.isNull())
return EphemeralRange();
VisiblePosition position = createVisiblePosition(positionWithAffinity);
VisiblePosition previous = previousPositionOf(position);
if (previous.isNotNull()) {
const EphemeralRange previousCharacterRange = makeRange(previous, position);
IntRect rect = editor().firstRectForRange(previousCharacterRange);
if (rect.contains(framePoint))
return EphemeralRange(previousCharacterRange);
}
VisiblePosition next = nextPositionOf(position);
const EphemeralRange nextCharacterRange = makeRange(position, next);
if (nextCharacterRange.isNotNull()) {
IntRect rect = editor().firstRectForRange(nextCharacterRange);
if (rect.contains(framePoint))
return EphemeralRange(nextCharacterRange);
}
return EphemeralRange();
}
static EphemeralRange expandEndToSentenceBoundary(const EphemeralRange& range) {
DCHECK(range.isNotNull());
const VisiblePosition& visibleEnd =
createVisiblePosition(range.endPosition());
DCHECK(visibleEnd.isNotNull());
const Position& sentenceEnd = endOfSentence(visibleEnd).deepEquivalent();
// TODO(xiaochengh): |sentenceEnd < range.endPosition()| is possible,
// which would trigger a DCHECK in EphemeralRange's constructor if we return
// it directly. However, this shouldn't happen and needs to be fixed.
return EphemeralRange(
range.startPosition(),
sentenceEnd.isNotNull() && sentenceEnd > range.endPosition()
? sentenceEnd
: range.endPosition());
}
