append digit to number         digits; [0-9]

clear number                   escape, C-g

goto the page before n-th aya  b, S-return, M-G

goto n-th sura                 s, C-return, C-M-g, s

goto n-th juz start            J, C-M-return, C-M-G

        gtk.keysyms.Return: _goto_before_aya,

        ord(' '): _prev_page,

        ord('?'): _search_backward,

        ord('J'): _goto_juz,

        ord('K'): _stop_player,

        ord('M'): _list_bookmarks,