在案例环境中进行点填充

Question

\dotfill我正在尝试在方程式环境中使用cases。我在这里采用了解决方案：案例中的对齐和点填充

但是，我希望能够在括号左侧写一些内容，而点不会超出范围textwidth。这是我的

\documentclass[a4paper]{article}
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage{amsmath}
\usepackage{tabularx}
\usepackage{lipsum}

\makeatletter

\newcommand*\Annadotfill{%
    \leavevmode
    % Do you really want "\cleaders"?
    \cleaders \hb@xt@ .33em{\hss .\hss }\hfill
    \kern \z@
}
\@ifdefinable\@Anna@brace@width{\newdimen\@Anna@brace@width}
\settowidth\@Anna@brace@width{%
    $\left\{\vbox{\vskip \@m \p@}\right.\kern -\nulldelimiterspace$%
}
\newenvironment{Annacases}{%
    \left\{%
    \tabcolsep \z@
    \def\arraystretch{1.2}% linespread: adjust as you please
    \tabularx{\dimexpr \linewidth-\@Anna@brace@width \relax}%
                {>{$}r<{$}>{${}}X<{$}}%
}{%
    \endtabularx
    \right.%
    \kern -\nulldelimiterspace
}

\makeatother

\begin{document}

$
f(x) = \begin{Annacases}
x & \Annadotfill \text{text;}\\
1-x & \Annadotfill \text{more text;}
\end{Annacases}
$

\lipsum[1]

\end{document}

我怎样才能修改代码以保留所有内容textwidth？

Answer 1

\documentclass[a4paper]{article}
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage{amsmath}
\usepackage{tabularx}
\usepackage{lipsum}


\begin{document}

$
f(x) = 
\left\{
\begin{array}{@{}r@{}}
x\\
1-x
\end{array}
\right.
\leaders
\hbox{$%
\begin{array}{@{\,}r@{\,}}
.\\
.
\end{array}%
$}\hfill
\begin{tabular}{@{}r@{}}
  text;\\
more text;
\end{tabular}
$

\lipsum[1]

\end{document}