[texhax] Problem with vertical alignment in beamer with itemize and columns

[Uwe Lück]

I am not sure about my (?) code! (see below)

At 16:07 31.03.10, Susan Dittmar wrote:
>Dear Thomas,
>
>Uwe Lück put together what you need for another version of the list
>enviroment (see Mail concerning \blockquote on March 25th). Problem is
>\topsep which is not zero in itemize environments. I adjusted your example
>to use his code (see below). If you use nesting lists, you will have to
>check whether you need to redefine their internals aswell.
>
>Hope that helps,
>
>         Susan
>
>\documentclass{beamer}
>\makeatletter   % use @ as another normal letter (as in style files)
>% Environment MYitemize behaves like itemize but with \topsep 0pt and
>% \partopsep 0pt. From an e-mail to texhax at tug.org by Uwe Lück
>% (uwe.lueck at web.de).
>\newenvironment{MYitemize}{%
>   \topsep=\z@
>   \partopsep=\z@

The previous two lines should suffice, I have looked at the LaTeX 
definitions again.
If they didn't with Jesus Guillermo Andrade, it is still a mystery to me, 
needing more analysis.

The following two lines are useful as a general redefinition of \@listi and 
\@listI in the document preamble only, I think, not as part of an 
environment definition. This addressed Jesus Guillermo Andrade's desire not 
to have any extra vertical spaces.

>   \def\@listi{\leftmargin\leftmargini \parsep\z@ \topsep\z@ \itemsep\z@}
>   \let\@listI\@listi
>   \itemize
>}{%
>   \enditemize
>}
>\makeatother    % back to normal usage of @
>\begin{document}
>    \begin{frame}[t]    % note the alignment on this slide is all top aligned
>    \begin{columns}[t]
>       \begin{column}{0.5\textwidth}
>           item baasdfasf \\
>           item baasdfasf \\
>           item baasdfasf \\
>           item baasdfasf
>       \end{column}
>       \begin{column}{0.5\textwidth}
>           item baasdfasf \\
>           item baasdfasf \\
>           item baasdfasf \\
>           item baasdfasf
>       \end{column}
>    \end{columns}
>    \end{frame}
>
>    \begin{frame}[t] % note on this slide the second column come out below 
> the first
>    \begin{columns}[t]
>       \begin{column}{0.5\textwidth}
>         \begin{MYitemize}
>           \item baasdfasf
>           \item baasdfasf
>           \item baasdfasf
>           \item baasdfasf
>         \end{MYitemize}
>       \end{column}
>       \begin{column}{0.5\textwidth}
>         \begin{MYitemize}
>           \item baasdfasf
>           \item baasdfasf
>           \item baasdfasf
>           \item baasdfasf
>         \end{MYitemize}
>       \end{column}
>    \end{columns}
>    \end{frame}
>\end{document}
>
>
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