Bug 34882 (Special-Character) - Special character dialog rework

i'm work in this bug -> create a recently special character used bar... i
will descript what i'm done

i do a subclass of the class "SvxShowCharSet" (it is the class of the grid
where there are the special character) and i modify it to view only 2 rows
and i put the char what i want.

i do the events mousebuttondown,mousebuttonup,mousebuttonmove.

what i want to do now is the implementation of a class that can memorize
the special char recently used... for this i need any suggestion to how to
work, i will explain what i think:

i think a class "RecUsedChar" with this attribute:
-char
-font
-subset
-hexadecimal code
-decimal code

the method:
-get e set method

then i think to make an array of this class where i can memorize the
recently used

my question of this:
where can i collocate this class? i do a hxx and cxx? which is the module
where can i put this classes?
can this idea be good?
is better make the array into the class (with a getChar(int index)?
then i have to  save this on the disk?
how?

thanks for your work!