From: Hans Hagen Wolfgang Schuster wrote:

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2007/3/14, Robin Kirkham :

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Is there a ConTeXt equivalent to LaTeX \settowidth{}, or better still some macro I can do things like

\setupsomething[ ... width={\widthof{\bf sometext\emspace}}, ...]

\def\setwidthof#1\to#2% {\bgroup \setbox\scratchbox\hbox{#1}% \expanded{\egroup\def\noexpand#2{\the\wd\scratchbox}}}

Thanks Wolfgang, Chen and Hans for your responses. I used Hans' one ... it seems to work. I'm actually trying to indent tables of contents by level. I want each indent to match the start of the heading text of the previous level, i.e., 1 Chapter 1.1 Section 1.1.1 Subsection 1.1.2 Subsection ... Title in other words, the indent is not quite a fixed width per level. The following complete example sort of does what I want (using Hans' \setwidthof) but it will fail when the section numbers have more digits than I have allowed for. I have a feeling I should be using \setupcombinedlist[content] [distance=1em] or something, but that puts an em space in front of unnumbered chapters (titles) as well. What I have done seems very ugly, surely there is a "proper" way? Robin % widthof macro from Hans \def\setwidthof#1\to#2% {\bgroup \setbox\scratchbox\hbox{#1}% \expanded{\egroup\def\noexpand#2{\the\wd\scratchbox}}} \setupcombinedlist[content][ alternative=c, aligntitle=yes] \setuplist[chapter][ alternative=b, style=bold] % calculate widths of numbers \setwidthof{\bf 9\emspace}\to\WDA \setwidthof{9.9\emspace}\to\WDB \setwidthof{9.9.9\emspace}\to\WDC \setwidthof{9.9.9.9\emspace}\to\WDD % calculate margins \setwidthof{{\bf 9\emspace}}\to\MAB \setwidthof{{\bf 9\emspace}9.9\emspace}\to\MAC \setwidthof{{\bf 9\emspace}9.9\emspace 9.9.9\emspace}\to\MAD \setuplist[chapter] [margin=0em, width=\WDA] \setuplist[section] [margin=\MAB, width=\WDB] \setuplist[subsection] [margin=\MAC, width=\WDC] \setuplist[subsubsection] [margin=\MAD, width=\WDD] \starttext \completecontent[criterium=all] \page \startfrontmatter \chapter{Unnumbered Chapter} \stopfrontmatter \startbodymatter \chapter{Chapter} \section{Section} \subsection{Subsection} \subsubsection{Subsubsection} \subsubsection{Subsubsection} \subsubsection{Subsubsection} \subsubsection{Subsubsection} \subsubsection{Subsubsection} \subsubsection{Subsubsection} \subsubsection{Subsubsection} \subsubsection{Subsubsection} \subsubsection{Subsubsection} \subsubsection{Subsubsection} \subsubsection{Subsubsection} \chapter{Chapter} \section{Section} \subsection{Subsection} \subsubsection{Subsubsection} \chapter{Chapter} \stopbodymatter \stoptext