Re: [NTG-context] unwanted head behavior

7 Apr 2016


      On 4/7/2016 8:28 AM, Zhichu Chen wrote:
...
If I understand correctly, the "continue=yes" key prevents a new page
generated by a lower-level structure, e.g., section, following a
higher-level structure, e.g., chapter.
Then why the checking is so complex in strc-sec.mkiv:
==================================
\def\strc_sectioning_handle_page_nop
   {\edef\p_continue{\headparameter\c!continue}%
    \ifx\p_continue\v!yes
      \ifnum\previoussectioncountervalue=\zerocount
        \strc_sectioning_check_layout
      \else\ifnum\currentsectioncountervalue>\zerocount
        \strc_sectioning_check_layout
      \fi\fi
    \else
      \strc_sectioning_check_layout
    \fi}
==================================
I temporarily changed the definition to:
==================================
\newcount\previousheadlevel
\previousheadlevel\plusone
\def\strc_sectioning_handle_page_nop
   {\edef\p_continue{\headparameter\c!continue}%
    \ifx\p_continue\v!yes
      \ifnum\currentheadlevel>\previousheadlevel\else
        \strc_sectioning_check_layout
      \fi
    \else
      \strc_sectioning_check_layout
    \fi
    \previousheadlevel\currentheadlevel}
==================================
Seems fine.
\def\currentsectioncountervalue 
{\clf_depthnumber\numexpr\thenamedheadlevel\currenthead\relax}
%def\previoussectioncountervalue{\clf_depthnumber\numexpr\thenamedheadlevel\currenthead+\minusone\relax}
\def\previoussectioncountervalue{\clf_depthnumber\numexpr\thenamedheadlevel\previoushead\relax}

\let\previoushead\empty

\def\strc_sectioning_handle_page_nop
   {\edef\p_continue{\headparameter\c!continue}%
    \ifx\p_continue\v!yes
      \ifx\currenthead\previoushead % not really needed
         \strc_sectioning_check_layout
      \else\ifnum\previoussectioncountervalue=\zerocount
         \strc_sectioning_check_layout
      \else\ifnum\currentsectioncountervalue>\zerocount
         \strc_sectioning_check_layout
      \fi\fi\fi
    \else
      \strc_sectioning_check_layout
    \fi
    \globallet\previoushead\currenthead}

\def\strc_sectioning_handle_page_yes
   {\ifconditional\c_strc_sectioning_ignore_page
      \setfalse\c_strc_sectioning_ignore_page
    \else
      % beware, these numbers are not yet know here
      \strc_sectioning_handle_page_nop
      \edef\p_aligntitle{\headparameter\c!aligntitle}%
      \ifx\p_aligntitle\v!float
          \ifconditional\c_strc_sectioning_auto_break
            \vspacing[\v!samepage-\currentheadlevel]%
          \fi
          \headparameter\c!before\relax
          \indent
      \else
          \page_otr_command_flush_side_floats
          \ifconditional\c_strc_sectioning_auto_break
            \vspacing[\v!samepage-\currentheadlevel]%
          \fi
          \headparameter\c!before\relax
      \fi
      \global\c_strc_sectioning_preceding_level\currentheadlevel
    \fi
    \globallet\previoushead\currenthead}

but it really needs testing with other cases


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