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\enableregime[utf]
small fixes (something about new/old columns still pending; text about floats doesn’t fit the current state)
* paragraphs : if you need a table-like structure (translations, questionaires etc.)
* column sets : the flexible way for varying columns or other complex tasks
* page grids : new column sets implementation (MkIV)
* streams : set different text synchronized side-by-side (e.g. bilingual editions)
Columns and columnset columnsets are two different mechanism mechanisms to produce a documentwith text and two or more columnsof text.
* The <code>columns</code> mechanism is the older one with limited control about the placement of figures but allows you to mix one column and multicolumns text on a page.
* <code>columnsets</code> is a new version of the column mechanism with more control about the placement of figures and other features like spanned columns etc. (look at the [[Columns#Column_Sets|manual]] for more); it is better than <code>columns</code> for magazine-like layouts.
</context>
Normally, columns are automatically balanced with the text distributed over the number or of requested columns. You can provoke a column switch using {{cmd|column}}.
<context source=yes>
Column balancing fails in "lines" mode (e.g. for poetry).
Influencing the color of the separator rule is somewhat tricky:
<context source=yes>
\setuppapersize[A5]
\setupcolors[textcolor=blue]
\color[red] % rule color, but might influence also the color of other elements
\startcolumns[n=3,rule=on]
\input knuth
\stopcolumns
</context>
=Paragraphs=
<context source="yes">
\setuppapersize[A5]
\defineparagraphs[TwoThird][n=2]
</context>
Another possibility is to use [[TextBackground|textbackground]] around the text. (The examples don't work in this wiki because, for security reasons, it has [[write18]] disabled. They should work for you, though, provided that [[write18]] is enabled on your local installation.)
<context source="yes">
\stoptext
</context>
=Page Grids=
Page grids are a new implementation of columnsets, intended to replace the old mechanism. From the [[source:page-cst.mkiv|source]]:
Columnsets are kind of special. They are mostly meant for special products with
magazine like properties. They are normally not mixed with single column layouts
and not all features of ConTeXt might cooperate well with a mechanism like
this. We use the name page grid because (as with other reimplementations of
MkII features in MkIV, we need another namespace in order to migrate stepwise.
This implementation is not neccessarily better than the previous one but it might
be easier to extend it. It should be a bit more efficient.
=Streams=
This is useful for, e.g., typesetting bilingual books: have the original on the even pages, the translation on the odd pages, and synchronize at certain points.
Hans later re-implemented that mechanism in the core. For details see [[source:mpage-streamsstr.texmkiv|streams module the source]].
The module provides a rather low-lever interface. Hans suggested some handy shortcuts:
Beware, streams don't work in columns and not very good in columnsets.
==Examples of MkIV streams==
(copied from the source)
<texcode>
\enabletrackers[streams.flushing]
\setuplayout[grid=yes] \showgrid
\starttext
\input tufte
\startoutputstream[nl]
Wat doen we hier?
\enableoutputstream[en]
Are you sleeping, brother John?\footnote{xxx}
\dorecurse{4}{x \footnote{note \recurselevel}\input tufte \par \pushoutputstream}
\enableoutputstream[de]
Bruder Jakob, schläfst du noch?\footnote{yyy}
\dorecurse{4}{x \footnote{note \recurselevel}\input ward \par \pushoutputstream}
\disableoutputstream
\stopoutputstream
Vader Jacob, slaap je nog?\footnote{zzz}
\input tufte
\synchronizestreams[en,de,nl]
\page \flushoutputstream[en] \input knuth
\page \flushoutputstream[de] \input knuth
\page \flushoutputstream[nl] \input knuth
\stoptext
</texcode>
Posting by Wolfgang to the mailing list (2016-11-27):
<texcode>
\starttext
\startoutputstream[one]
\setupalign[flushleft]
\dorecurse{3}{Line \recurselevel\par}\pushoutputstream
\blank
\dorecurse{6}{Line \recurselevel\par}\pushoutputstream
\blank
\dorecurse{4}{Line \recurselevel\par}\pushoutputstream
\stopoutputstream
\startoutputstream[two]
\setupalign[flushright]
\dorecurse{5}{Line \recurselevel\par}\pushoutputstream
\blank
\dorecurse{2}{Line \recurselevel\par}\pushoutputstream
\blank
\dorecurse{7}{Line \recurselevel\par}\pushoutputstream
\stopoutputstream
\synchronizestreams[one,two]
\startoverlay
{\outputstreambox[one]}
{\raise2\strutdp\outputstreambox[two]}
\stopoverlay
\stoptext
</texcode>
(Wolfgang continued:)
The mechanism to create pages/columns for the stream content is
missing.
You can save text and flush it afterwards but there is no command which
places the content side by side (or in columns). Below is a simple example
but I had to write the splitter myself.
<texcode>
\starttext
\startoutputstream[one]
\startcolor[red]
\dorecurse{10}{\input knuth\par}
\stopcolor
\stopoutputstream
\startoutputstream[two]
\startcolor[green]
\dorecurse{10}{\input zapf\par}
\stopcolor
\stopoutputstream
\synchronizestreams[one,two]
\setbox\scratchboxone\outputstreambox[one]
\setbox\scratchboxtwo\outputstreambox[two]
\doloop
{\ifvoid\scratchboxone
\exitloop
\else
\setbox\scratchboxfour\vsplit\scratchboxone to \textheight
\vbox to \vsize{\box\scratchboxfour\vss}%
\setbox\scratchboxfive\vsplit\scratchboxtwo to \textheight
\vbox to \vsize{\box\scratchboxfive\vss}%
\fi}
\stoptext
</texcode>
{{todo|We need documentation and samples for Paragraphs, Streams and Column Sets}}
This has some limitations, too. If you put a float at the top of a column and there is another float that spans more than a column over all, the grid will be broken, so you have to put it in another page, but you can put more than one float of the same type together, as seen above.
== See also ==
* {{cmd|definemixedcolumns}}
{{Columns navbox}}
