ValidScrollOffsetFor
newOffset = ValidScrollOffsetFor(newOffset);
offset = ValidScrollOffsetFor(offset);
offset = ValidScrollOffsetFor(offset);
return ValidScrollOffsetFor(offset, fDataRect);
BPoint offset = ValidScrollOffsetFor(fScrollOffset);
BPoint offset = ValidScrollOffsetFor(fScrollOffset);
BPoint ValidScrollOffsetFor(BPoint offset) const;
BPoint ValidScrollOffsetFor(BPoint offset,