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calc-package 阻止 \headheight 更改

tag-icon • tag-icon fancyhdr calc
calc-package 阻止 \headheight 更改

我正在尝试自动设置正确的\headheight以下内容Heiko Oberdiek 的方法。这是基于这样的事实：fancyhdr包通常会根据需要增加\headheight并将该值保存到文件的最后。问题是，当使用该calc包时，该值似乎没有改变（尽管日志文件仍然声称“我们现在将其设置为文档其余部分的大小。”）。

我知道我可以通过使用和朋友来避免该calc包，但我需要需要该包的包。\dimexprmathtoolscalc

有人知道如何获取正确的值，\headheight即使calc使用了包？

\documentclass{article}
\usepackage{blindtext}
\usepackage{calc} % this suppresses fancyhdr's feature of increasing \headheight as required


% ===== save header and footer height =====
% https://tex.stackexchange.com/a/117810/120953
\usepackage{atveryend}
\makeatletter
\AtVeryEndDocument{%
    \if@filesw % respect \nofiles
        \begingroup
            % same write register as environment `filecontents` uses
            \chardef\reserved@c=15 %
            \immediate\openout\reserved@c=\jobname.heights\relax
            \immediate\write\reserved@c{%
                \string\setlength{\string\headheight}{\the\headheight}%
            }%
            \immediate\write\reserved@c{%
                \string\setlength{\string\footskip}{\the\footskip}%
            }%
            \immediate\closeout\reserved@c
        \endgroup
        \showthe\headheight
    \fi
}
\makeatother

%\InputIfFileExists{\jobname.heights}{}{} % I have commented this out for testing
\usepackage[
    includehead,
    includefoot,
    showframe,
]{geometry}


% ===== header & footer =====
\usepackage{fancyhdr}
\usepackage{lastpage}
\usepackage{graphicx}
\pagestyle{fancy}

\fancyhead{}
\fancyhead[L]{a rather long header\\ which needs to be broken into several lines}
%\fancyhead[R]{\includegraphics[height=\dimexpr\the\headheight-4.3501pt\relax]{icon}}

\fancyfoot{}
\fancyfoot[R]{page \thepage \ of \pageref{LastPage}}
\fancyfoot[L]{some footer}

\renewcommand{\headrulewidth}{0pt}
\renewcommand{\footrulewidth}{0pt}


% ===== test document =====
\begin{document}
    \blinddocument
\end{document}

答案1

fancyhdr在一个不支持 LaTeX 语法的地方使用\global\setlength，如果加载，它根本不起作用calc。在这种情况下很容易避免它，只需删除\setlength并使用原始分配即可。

\documentclass{article}
\usepackage{blindtext}
\usepackage{calc} % this suppresses fancyhdr's feature of increasing \headheight as required


% ===== save header and footer height =====
% http://tex.stackexchange.com/a/117810/120953
\usepackage{atveryend}
\makeatletter
\AtVeryEndDocument{%
    \if@filesw % respect \nofiles
        \begingroup
            % same write register as environment `filecontents` uses
            \chardef\reserved@c=15 %
            \immediate\openout\reserved@c=\jobname.heights\relax
            \immediate\write\reserved@c{%
                \string\setlength{\string\headheight}{\the\headheight}%
            }%
            \immediate\write\reserved@c{%
                \string\setlength{\string\footskip}{\the\footskip}%
            }%
            \immediate\closeout\reserved@c
        \endgroup
        \showthe\headheight
    \fi
}
\makeatother

%\InputIfFileExists{\jobname.heights}{}{} % I have commented this out for testing
\usepackage[
    includehead,
    includefoot,
    showframe,
]{geometry}


% ===== header & footer =====
\usepackage{fancyhdr}

\makeatletter
\def\@fancyvbox#1#2{\setbox0\vbox{#2}\ifdim\ht0>#1\@fancywarning
  {\string#1 is too small (\the#1): ^^J Make it at least \the\ht0.^^J
    We now make it that large for the rest of the document.^^J
    This may cause the page layout to be inconsistent, however\@gobble}%
  \dimen0=#1\relax
  \global#1\ht0\ht0=\dimen0\fi
  \box0}
\makeatother

\usepackage{lastpage}
\usepackage{graphicx}
\pagestyle{fancy}

\fancyhead{}
\fancyhead[L]{a rather long header\\ which needs to be broken into several lines}
%\fancyhead[R]{\includegraphics[height=\dimexpr\the\headheight-4.3501pt\relax]{icon}}

\fancyfoot{}
\fancyfoot[R]{page \thepage \ of \pageref{LastPage}}
\fancyfoot[L]{some footer}

\renewcommand{\headrulewidth}{0pt}
\renewcommand{\footrulewidth}{0pt}


% ===== test document =====
\begin{document}
    \blinddocument
\end{document}

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