使描述项的行对齐

Question

我正在尝试将单个描述项的行对齐。当我引入换行符或行变得太长时，新行不会与第一行对齐。我知道第一行必须处理标签占用的空间，但我希望其他行无论如何都从相同的位置（水平）开始。以下是说明我的问题的示例代码：

\documentclass[12pt,a4paper]{article}
\begin{document}
\begin{description}
\item [Label]Here is a long item that requires a line break. The second line of this item 
won't line up with the first word. I can achieve this manually\\ \hspace*{2mm} by forcing a
line break and setting an apropriate value in \textbackslash hspace*, but I want this to be 
automised. Please help me.
\end{description}

\end{document}

结果如下：

我很感激任何帮助。这真让我抓狂。

Answer 1

如果我理解正确的话，labelingKOMA-script 包提供的环境可以完成您想要的工作：

\documentclass[12pt,a4paper]{article}
\usepackage{scrextend}
\usepackage{blindtext}
\setkomafont{labelinglabel}{\bfseries}
\usepackage{showframe}
\begin{document}
\begin{labeling}{A long long label}%Giving the longest label for alignment
    \item [Label] 
        Here is a long item that requires a line break. The second
        line of this item won't line up with the first word. I can
        achieve this manually\\
        by forcing a line break and setting an apropriate value in
        \textbackslash hspace*, but I want this to be automised.
        Please help me.
    \item [A long long label] 
        a manual linebreak, though not
        recommended \\
        \blindtext
\end{labeling}
\end{document}

这里包scrextend提供了您所需的一切，切换到 koma 类（scrartcl）可能是一个优势。labeling环境以最长的标签作为参数，需要正确对齐。这个参数也可以更短，只需玩一下。

Answer 2

作为 KOMA 类或的替代scrextend，您可以使用enumitem包，将键设置labelwidth为标签的宽度。

我通过结合（a）得到了这个解决方案伯纳德的回答到使用描述环境的简单年表以及（b）伯纳德的回答到如何将描述的左边距设置为 enumitem 中特定标签的宽度？您可以在以下位置找到相同的解决方案Gonzalo Medina 的回答到具有对齐描述的描述列表。

\documentclass[12pt,a4paper]{article}
\usepackage{enumitem}
\begin{document}
\begin{description}[%
        labelwidth=3cm,%
        leftmargin=!%
    ]
\item [Label]Here is a long item that requires a line break. The second line of this item 
won't line up with the first word. I no longer need to achieve this manually by forcing a
line break and setting an appropriate value in \textbackslash hspace*.

Here's a second paragraph of the same item.
\item [A longer label]Here is a second item. It has a longer label, necessitating a larger labelwidth.
\end{description}
\end{document}

输出如下：

calc您还可以通过添加包并使用其命令来计算最宽标签的宽度\widthof：

\documentclass[12pt,a4paper]{article}
\usepackage{enumitem}
\usepackage{calc}% Supports \widthof command
\begin{document}
\begin{description}[%
        labelwidth=\widthof{\bfseries A longer label},%
        leftmargin=!%
    ]
\item [Label]Here is a long item that requires a line break. The second line of this item 
won't line up with the first word. I no longer need to achieve this manually by forcing a
line break and setting an appropriate value in \textbackslash hspace*.

Here's a second paragraph of the same item.
\item [A longer label]Here is a second item. It has a longer label, necessitating a larger labelwidth.
\end{description}
\end{document}

这基本上给出了相同的输出。请注意\widthof{\bfseries A longer label}，在中必须指定\bfseries：标签排版为粗体。您需要确保您测量宽度的文本\widthof也排版为粗体。

您可以通过让环境自动确定哪个标签最宽，进一步实现自动化。请参阅Gonzalo Medina 的回答到labelwidth根据最宽的标签自动设置描述列表？。