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可变长度块和长条目

tag-icon • tag-icon itemize block
可变长度块和长条目

我定义了两个块环境，一个具有固定宽度，另一个具有可变长度（第二个基于定义这里)。一般情况下一切正常。但是，当我在可变长度块内的 itemize 环境中有一条长行时，它不会换行并且会变宽。我的代码及其生成的内容如下。有没有办法修复定义，以便 itemized 行可以正确换行？非常感谢。

![\documentclass\[table,xcolor=pdftex,dvipsnames\]{beamer}

\newenvironment<>{problock}\[1\]{%
  \begin{actionenv}#2%
      \def\insertblocktitle{#1}%
      \par%
      \mode<presentation>{%
        \setbeamercolor{block title}{fg=white,bg=blue!50!white}
       \setbeamercolor{block body}{fg=black,bg=blue!20}
       \setbeamercolor{itemize item}{fg=blue}
       \setbeamertemplate{itemize item}\[triangle\]
     }%
      \usebeamertemplate{block begin}}
    {\par\usebeamertemplate{block end}\end{actionenv}}

\newenvironment<>{varproblock}\[2\]\[.9\textwidth\]{%
  \setlength{\textwidth}{#1}
  \begin{actionenv}#3%
      \def\insertblocktitle{#2}%
      \par%
      \mode<presentation>{%
        \setbeamercolor{block title}{fg=white,bg=blue!50!white}
       \setbeamercolor{block body}{fg=black,bg=blue!20}
       \setbeamercolor{itemize item}{fg=blue}
       \setbeamertemplate{itemize item}\[triangle\]
     }%
      \usebeamertemplate{block begin}}
    {\par\usebeamertemplate{block end}\end{actionenv}}

\begin{document}

\begin{frame}
\begin{problock}{Definition}
Given a countably infinite set $\cal{D}$ (documents), a Web of Linked Data is a tuple $W = ( D, adoc, data )$ where:
\begin{itemize}
\item $D \in \cal{D}$, 
\item $adoc$ is a partial mapping from URIs to $D$, and
\item $data$ is a total mapping from $D$ to finite sets of RDF triples.
\end{itemize}
\end{problock}

\begin{varproblock}\[8cm\]{Definition}
A Web of Linked Data  $W = (D, adoc, data)$ contains a data link from document $D \in \cal{D}$ to document $D' \in \cal{D}$ if there exists a URI $u$ such that:
\begin{itemize}
\item $u$ is mentioned in an RDF triple $t \in data(D)$ and
\item $D' = adoc(u)$.
\end{itemize}
\end{varproblock}

\end{frame}
\end{document}][2]

答案1

对我来说，与其尝试更改，不如\textwidth将内容包装varproblock在 minipage 环境中更明智。据我所知，没有任何副作用。对于您的第二个框，这给出：

在此处输入图片描述

以下是我修改你的环境的方法：

\newenvironment<>{varproblock}[2][.9\textwidth]{%
  \begin{actionenv}#3%
    \minipage{#1}
      \def\insertblocktitle{#2}%
      \par%
      \mode<presentation>{%
        \setbeamercolor{block title}{fg=white,bg=blue!50!white}
       \setbeamercolor{block body}{fg=black,bg=blue!20}
       \setbeamercolor{itemize item}{fg=blue}
       \setbeamertemplate{itemize item}[triangle]
     }%
      \usebeamertemplate{block begin}}
    {\par\usebeamertemplate{block end}\endminipage\end{actionenv}}

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