如何获取当前浮动的高度？

Question

我正在使用sidecpation该sidenotes包将标题排版到页边距中。我希望这些标题与浮动顶部对齐。

可以简单地将sidecaption命令放在浮动的开头。但是，与子图结合使用时，这会破坏编号（这里)。由于这个问题，我将命令放在sidecaption最后，并使用可选offset参数重新定位它。手动执行此操作并为大量图形实现一致的布局非常困难，我希望实现自动化。

将当前图形的高度作为偏移量，可以以简单直接的方式解决这个问题。但我如何获得这个长度呢？

请注意，我感兴趣的不是单张图片的高度，而是整个浮动的高度，浮动高度可能由subfigure具有单独子标题的环境中的多张图片组成。如果该方法还涵盖，那将是一个加分项tabulars。

也可以使用其他选项来将侧标题顶部对齐。但它们应该满足所述要求这里。

简短的 MWE：

\documentclass[a4paper,11pt]{scrbook}

\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage{graphicx}
\usepackage{hyperref}
\usepackage{blindtext}

% \usepackage{etoolbox}
% \usepackage{calc}

\usepackage{geometry}
\geometry{a4paper, top=10mm, left=33mm, right=46mm, bottom=46mm, headsep=\baselineskip, 
          marginparwidth=43mm, marginparsep=1em}

% ********************************************************************
% captions, taking use of the margins
% ********************************************************************
\usepackage{ragged2e}
\usepackage{sidenotes}
\DeclareCaptionStyle{stdstyle}{
    format=hang,                 % caption hangs behind label
    justification=justified,    
    labelsep=quad,               % quad separator behind label
    font=footnotesize            % all in small font size
}
\DeclareCaptionJustification{outerragged}{\ifthispageodd{\RaggedRight}{\RaggedLeft}}
\DeclareCaptionStyle{sidestyle}{
    format=plain, %indention=2em, % whole line for caption, with indent after first
    justification=outerragged,    % caption is a normal paragraph
    labelsep=newline,             % quad separator behind label
    font=footnotesize             % all in small font size
}
\DeclareCaptionStyle{sidecaption}{
    style = sidestyle,
    format=plain,
    labelsep=newline
}
\usepackage[style = stdstyle]{caption}
\usepackage[
    format=hang,
    justification=raggedright
]{subcaption}

\begin{document}
\chapter{for the numbers}

\begin{figure}
    \begin{subfigure}{0.49\textwidth}
        \includegraphics[width=\columnwidth]{example-image-a}%
        \caption{some text for a}
        \label{fig:3:a}
    \end{subfigure}%
    \begin{subfigure}{0.49\textwidth}
        \includegraphics[width=\columnwidth]{example-image-b}
        \caption{some text for b}
        \label{fig:3:b}
    \end{subfigure}%
    \sidecaption[LoF][-2em]{I want to be aligned at the top of the float
    \label{fig:3}
    }
\end{figure}


\end{document}

Answer 1

如果要将\sidecaption与整个浮动对齐，只需将内容（除\sidecaption）放入小页面，然后使用\raisebox移动基线，

\strut通过测量标题内部的高度获得了 7.69997pt 的值。

\documentclass[a4paper,11pt]{scrbook}

\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage{graphicx}
\usepackage{hyperref}
\usepackage{blindtext}

% \usepackage{etoolbox}
% \usepackage{calc}

\usepackage{geometry}
\geometry{a4paper, top=10mm, left=33mm, right=46mm, bottom=46mm, headsep=\baselineskip, 
          marginparwidth=43mm, marginparsep=1em}

% ********************************************************************
% captions, taking use of the margins
% ********************************************************************
\usepackage{ragged2e}
\usepackage{sidenotes}
\DeclareCaptionStyle{stdstyle}{
    format=hang,                 % caption hangs behind label
    justification=justified,    
    labelsep=quad,               % quad separator behind label
    font=footnotesize            % all in small font size
}
\DeclareCaptionJustification{outerragged}{\ifthispageodd{\RaggedRight}{\RaggedLeft}}
\DeclareCaptionStyle{sidestyle}{
    format=plain, %indention=2em, % whole line for caption, with indent after first
    justification=outerragged,    % caption is a normal paragraph
    labelsep=newline,             % quad separator behind label
    font=footnotesize             % all in small font size
}
\DeclareCaptionStyle{sidecaption}{
    style = sidestyle,
    format=plain,
    labelsep=newline
}
\usepackage[style = stdstyle]{caption}
\usepackage[
    format=hang,
    justification=raggedright
]{subcaption}

\begin{document}
\chapter{for the numbers}

\begin{figure}
\raisebox{\dimexpr 7.69997pt-\height}{\begin{minipage}{\textwidth}
    \begin{subfigure}{0.49\textwidth}
        \includegraphics[width=\columnwidth]{example-image-a}
        \caption{some text for a}
        \label{fig:3:a}
    \end{subfigure}%
    \begin{subfigure}{0.49\textwidth}
        \includegraphics[width=\columnwidth]{example-image-b}
        \caption{some text for b}
        \label{fig:3:b}
    \end{subfigure}%
    \end{minipage}}\nobreak
    \sidecaption[LoF][-2em]{I want to be aligned at the top of the float
    \label{fig:3}
    }
\end{figure}


\end{document}