Re: unwanted head behavior

[Zhichu Chen <chenzhichu@sinap.ac.cn>]

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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.



PS: irrelevant to my problem, but I just wish ConTeXt to be perfect. So:
1, line 1060, file strc-sec.mkiv:
\global\setfalse\c_strc_rendering_continue
shouldn't this line be "\global\setfalse\c_strc_rendering_continuous"?
2, a lot of \.._strc_sectioniong_... macros in strc-sec.mkiv. I think 
changing the "sectioniong" to "sectioning" may prevent potential typos.



On 04/05/2016 01:19 PM, Zhichu Chen wrote:
>
> Dear Hans and Wolfgang,
>
> The following code generates a pdf that I cannot understand.
>
> 1. Although "placehead" is set to "no," the \part macro still makes an empty line.
> 2. The first \chapter does not open a new page, but if we switch the first \title
>      and the first \chapter, the result seems to be all right.
>
> Is there a simple fix?
>
> Thanks in advance.
>
> ==================================
> \setuphead
>    [part,chapter,title,section]
>    [continue=yes,page=yes,number=no]
>
> \setuphead[part][placehead=no]
>
>
> \showframe
>
> \starttext
>
> \input ward\page
>
> \part{TITLE}\input ward\par
> \title{Title}
> \chapter{Title}
> \chapter{Title}
> \title{Title}
> \chapter{Title}
>
> \stoptext
> ==================================
>
> ConTeXt minimal information:
>
>
> context -version
>
> mtx-context     | ConTeXt Process Management 0.63
> mtx-context     |
> mtx-context     | main context file:
> /opt/context/tex/texmf-context/tex/context/base/mkiv/context.mkiv
> mtx-context     | current version: 2016.03.26 13:51
>
>
> luatex -version
> This is LuaTeX, Version beta-0.90.0 (TeX Live 2016)
>
> Execute  'luatex --credits'  for credits and version details.
>
> There is NO warranty. Redistribution of this software is covered by
> the terms of the GNU General Public License, version 2 or (at your option)
> any later version. For more information about these matters, see the file
> named COPYING and the LuaTeX source.
>
> LuaTeX is Copyright 2016 Taco Hoekwater and the LuaTeX Team.
> -- 
> Best regards,
> ℤhichu ℂhen
>
> Shanghai Institute of Applied Physics
> No. 2019, Jialuo Road
> Jiading, Shanghai, P.R.China
> Tel: +86-21-39194888
>
>
>
>
>
> ___________________________________________________________________________________
> If your question is of interest to others as well, please add an entry to the Wiki!
>
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> wiki     : http://contextgarden.net
> ___________________________________________________________________________________


-- 
Best regards,
ℤhichu ℂhen

Shanghai Institute of Applied Physics
No. 2019, Jialuo Road
Jiading, Shanghai, P.R.China
Tel: +86-21-39194888


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___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage  : http://www.pragma-ade.nl / http://tex.aanhet.net
archive  : http://foundry.supelec.fr/projects/contextrev/
wiki     : http://contextgarden.net
___________________________________________________________________________________