if i use setWordWrapping(false), the new line only do;t create until a '\n' is given.
in fact if i edit the TextUtils::DefaultWrapDelimiters(" \n\t\r") to TextUtils::DefaultWrapDelimiters("") , my problem is over.
but the important thing i wanted to know is that why we use the " \n\t\r" to wrap the string, and when we discuss the issue, i get it.
there are some differents between our mode of text writen.
it's a interesting to me too.

