best way to cutomize gtktextview

[mehmet YASAR <my alor gmail com>]

Hi,

I'm displaying "logical block" of text inside a gtktextview and I need to control how it is displayed.
I'm mainly using gtktextview's line wrapping but I may insert some new line.

Let suppose I have two blocks (A & B), the resulting string is:
        "AAAAA A AAAA A AABBB BBBBBBBBB BBBB B"

I want the gtktextview to display it (depending on the gtktextview's width)
        AAAAA A AAAA A AABBB BBBBBBBBB BBBB B\n
or 
        AAAAA A AAAA A AA \n
        BBB BBBBBBBBB BBBB B

What I've done is:
- catch "size-allocate" signal
- use gtk_text_view_forward_display_line_end to check how the block are displayed
- insert new line into gtktextbuffer where necessary

That works but it is a bit slow, is there a better way to do it ?