inline read onlyBOTTOM_TO_TOP:TextDirection
inline read onlyINVALID:TextDirection
inline read onlyLEFT_TO_RIGHT:TextDirection
inline read onlyRIGHT_TO_LEFT:TextDirection
inline read onlyTOP_TO_BOTTOM:TextDirection
read onlybackward:Bool
read onlyforward:Bool
read onlyhorizontal:Bool
read onlyvertical:Bool
inline reverse ():Void
inline toString ():String