If you are talking about TextField , there is no question of scrolling.(beware ???)
I think ,atleast
you should read this.You will get the answer:
The width of a "column" is equal to the width of a character, in the particular font being used. In the case of fixed pitch fonts, where all the characters are the same size, this is straightforward. For proportional fonts, the width of a column is equal to the average of the width of all the characters in the font. This means, for example, if you had text component with a proportional font and a width of 10 columns, if you use a narrow letter such as 'i', more than 10 'i's could be displayed.