一起使用 \nameref (hyperref) 和 \mdtheorem (mdframed) 的問題

Question

當使用\mdtheorem命令 (from mdframed) 和\nameref(from hyperref) 時，應用於使用的定理的標籤似乎\mdtheorem不會適當地採用給定理的標題。相反，它採用當前部分的標題，如以下 MWE 所示：

\documentclass{article}
\usepackage{tikz}
\usepackage[framemethod=tikz]{mdframed}
\usepackage{hyperref}
\tikzset{tatregris/.style =
{draw=gray, thick, fill=white, shading = theoremtitle, %
text=gray, rectangle, rounded corners, right,minimum height=.7cm}}
\pgfdeclarehorizontalshading{theorembackground}{100bp}
{color(0bp)=(black!2); color(100bp)=(black!15)}
\makeatletter
\mdfdefinestyle{theoremstyle}{%
outerlinewidth=0em,outerlinecolor=white,%
leftmargin=-1em,rightmargin=-1em,%
middlelinewidth=1.2pt,roundcorner=5pt,linecolor=gray,
apptotikzsetting={\tikzset{mdfbackground/.append style ={%
shading = theorembackground}}},
innertopmargin=1.2\baselineskip,
skipabove={\dimexpr0.5\baselineskip+\topskip\relax},
skipbelow={-1em},
needspace=\baselineskip,
frametitlefont=\sffamily\scshape,
}
\makeatother
\mdtheorem[style=theoremstyle]{thm}{Theorem}[section]
\begin{document}
\section{Section name}
\begin{thm}[Theorem name] \label{theorem name}
This is a theorem.
\end{thm}
\nameref{theorem name} is a theorem.
\end{document}

值得注意的是，使用時不存在該問題\newmdtheoremenv（這不是有效的修復，因為我需要 給出的未編號環境，\mdtheorem並且我更喜歡將定理標題作為框架標題。）

有什麼辦法可以解決這個問題嗎？

Answer 1

你需要允許nameref設定時提取名稱thm。為此，我們可以修補\thm（使用xpatch）：

\documentclass{article}
\usepackage[framemethod=tikz]{mdframed}
\usepackage{hyperref,xpatch}

\tikzset{tatregris/.style =
  {draw=gray, thick, fill=white, shading = theoremtitle, %
  text=gray, rectangle, rounded corners, right,minimum height=.7cm}}
  \pgfdeclarehorizontalshading{theorembackground}{100bp}
  {color(0bp)=(black!2); color(100bp)=(black!15)}

\mdfdefinestyle{theoremstyle}{%
  outerlinewidth=0em,outerlinecolor=white,%
  leftmargin=-1em,rightmargin=-1em,%
  middlelinewidth=1.2pt,roundcorner=5pt,linecolor=gray,
  apptotikzsetting={\tikzset{mdfbackground/.append style ={%
  shading = theorembackground}}},
  innertopmargin=1.2\baselineskip,
  skipabove={\dimexpr0.5\baselineskip+\topskip\relax},
  skipbelow={-1em},
  needspace=\baselineskip,
  frametitlefont=\sffamily\scshape,
}

\mdtheorem[style=theoremstyle]{thm}{Theorem}[section]
\newcommand{\thmautorefname}{Theorem}
\makeatletter
\xpatchcmd{\thm}{\refstepcounter}{\NR@gettitle{#1}\refstepcounter}{}{}
\makeatother

\begin{document}
\section{Section name}

\begin{thm}[Theorem name] \label{theorem_name1}
This is a theorem.
\end{thm}

\nameref{theorem_name1} is a named theorem. \autoref{theorem_name2} is not a named theorem.

\begin{thm}\label{theorem_name2}
This is a theorem.
\end{thm}

\end{document}

當然，如果您不提供名稱作為 的可選參數thm，那麼\nameref將會失敗。但是，您也可以用於\autoref此目的。

Answer 2

維爾納的概括回答。以下範例修補\mdtheorem以透過此命令擷取所有定理。的程式碼\mdtheorem包含很多 case，因此此範例使用循環來取得 all \ifstrempty，並重複使用其參數來取得標題。如果標題為空，則該範例不會設定標題。也可以變更為使用空標題nameref。

\documentclass{article}
\usepackage[framemethod=tikz]{mdframed}
\usepackage{hyperref,xpatch}

\tikzset{tatregris/.style =
  {draw=gray, thick, fill=white, shading = theoremtitle, %
  text=gray, rectangle, rounded corners, right,minimum height=.7cm}}
  \pgfdeclarehorizontalshading{theorembackground}{100bp}
  {color(0bp)=(black!2); color(100bp)=(black!15)}

\mdfdefinestyle{theoremstyle}{%
  outerlinewidth=0em,outerlinecolor=white,%
  leftmargin=-1em,rightmargin=-1em,%
  middlelinewidth=1.2pt,roundcorner=5pt,linecolor=gray,
  apptotikzsetting={\tikzset{mdfbackground/.append style ={%
  shading = theorembackground}}},
  innertopmargin=1.2\baselineskip,
  skipabove={\dimexpr0.5\baselineskip+\topskip\relax},
  skipbelow={-1em},
  needspace=\baselineskip,
  frametitlefont=\sffamily\scshape,
}

\makeatletter
\newcommand*{\mdfNR@gettitle@ifstrempty}[1]{%
  \ifstrempty{#1}{%
    \@firstoftwo
  }{%
    \NR@gettitle{#1}%
    \@secondoftwo
  }%
}
% Variant: Define title string for nameref regardless of its emptyness
% \newcommand*{\mdfNR@gettitle@ifstrempty}[1]{%
%   \NR@gettitle{#1}%
%   \ifstrempty{#1}%
% }
\count@=\@ne
\@whilenum\count@>\z@\do{%
  \expandafter\xpatchcmd\csname mdtheorem code\endcsname{%
    \ifstrempty%
  }{%
    \mdfNR@gettitle@ifstrempty
  }{%
    \advance\count@\@ne
  }{%
    \count@=-\count@
  }%
}
\ifnum\count@>\z@
\else
  \@latex@warning{Could not patch \string\mdtheorem}%
\fi
\makeatother

\mdtheorem[style=theoremstyle]{thm}{Theorem}[section]
\newcommand{\thmautorefname}{Theorem}

\begin{document}
\section{Section name}

\begin{thm}[Theorem name] \label{theorem_name1}
This is a theorem.
\end{thm}

\nameref{theorem_name1} is a named theorem. \autoref{theorem_name2} is not a
named theorem.

\begin{thm}\label{theorem_name2}
This is a theorem.
\end{thm}

\end{document}