[Tex/LaTex] Beamer (Boadilla theme): Color of itemize subitems inside blocks

beamercoloritemize

When using the "Boadilla" theme in the beamer package, I noticed that the bullets of subitems in the itemize environment have different colors inside block environments than outside. The problem is that the color is almost the same as the background, so the individual bullets are barely visible.

Is there a way to change the subitem bullet color to the same color used outside of blocks?

Here is an example of the problem:

\documentclass{beamer}
\usetheme{Boadilla}

\begin{document}

\begin{frame}
    \begin{block}{block}
        \begin{itemize}
            \item item 1
            \item item 2
            \begin{itemize}
                \item subitem 1
                \item subitem 2
                \begin{itemize}
                    \item subsubitem
                \end{itemize}
            \end{itemize}
        \end{itemize}
    \end{block}

    \begin{itemize}
        \item item 1
        \item item 2
        \begin{itemize}
            \item subitem 1
            \item subitem 2
            \begin{itemize}
                \item subsubitem
            \end{itemize}
        \end{itemize}
    \end{itemize}
\end{frame}

\end{document}

Best Answer

I don't understand very well how does it work, but a fast solution is to add these lines to the preamble or inside a group where you wish to get that result.

\colorlet{custom}{beamerstructure}
\setbeamertemplate{itemize subitem}{\tiny\raise1.5pt\hbox{\color{custom}$\blacktriangleright$}}
\setbeamertemplate{itemize subsubitem}{\tiny\raise1.5pt\hbox{\color{custom}$\bigstar$}}

I tried to patch the Boadilla theme definitions.

Full Code

\documentclass{beamer}
\usetheme{Boadilla}

\colorlet{custom}{beamerstructure}
\setbeamertemplate{itemize subitem}{\tiny\raise1.5pt\hbox{\color{custom}$\blacktriangleright$}}
\setbeamertemplate{itemize subsubitem}{\tiny\raise1.5pt\hbox{\color{custom}$\bigstar$}}
\begin{document}

\begin{frame}
    \begin{block}{block}
        \begin{itemize}
            \item item 1
            \item item 2
            \begin{itemize}
                \item subitem 1
                \item subitem 2
                \begin{itemize}
                    \item subsubitem
                \end{itemize}
            \end{itemize}
        \end{itemize}
    \end{block}

    \begin{itemize}
        \item item 1
        \item item 2
        \begin{itemize}
            \item subitem 1
            \item subitem 2
            \begin{itemize}
                \item subsubitem
            \end{itemize}
        \end{itemize}
    \end{itemize}
\end{frame}

\end{document}

Result

enter image description here

Related Solutions

[Tex/LaTex] How to modify itemize vertical spacing within blocks in beamer

There are two things going on in this situation. For those who know about LaTeX's list parameters, there is a \topsep being added before the itemize list. The other is that this item is starting in vertical mode, so a \partopsep is also being added.

We thus need to do two things in this situation: (1) set \topsep to zero for the list, via a redefinition \@listi, and (2) clear \partopsep.

The best way to do this is to add this to block begin template. Here is an example, based on the essentials of your code.

\documentclass[10pt]{beamer}
\usepackage{lmodern}
\usepackage[T1]{fontenc}

\usetheme{default}
\usecolortheme{crane}

\setbeamertemplate{itemize items}[square]

\setbeamercolor{item}{fg=black}
\setbeamercolor{frametitle}{fg=black}
\setbeamercolor{block title}{fg=black}
\setbeamercolor{title}{fg=black}
\setbeamercolor{block body}{bg=white}

\makeatletter
\addtobeamertemplate{block begin}{
\def\@listi{\leftmargin\leftmargini
              \topsep    0pt
              \parsep    0pt
              \itemsep   3pt plus 2pt minus 3pt}
\partopsep 0pt
}
\makeatother

\begin{document}


\begin{frame}
  \frametitle{text vs. item blocks}
  \begin{columns}[t]
    \begin{column}{0.42\textwidth}
      \begin{block}{text block}
        block block block block block\vadjust{\hrule}
        block block block block block 
        block block block block block 
        block block block block block 
      \end{block}
    \end{column}
    \begin{column}{0.48\textwidth}
      \begin{block}{item block}
        \begin{itemize}
        \item item\vadjust{\hrule}
        \item item
        \item item
        \end{itemize}
      \end{block}
    \end{column}
  \end{columns}
\end{frame}

\end{document}

Sample output

I have placed the blocks side-by-side and added the \vadjust{\hrule} for illustration purposes. The values for \@listi are based on beamers defaults which are

\def\@listi{\leftmargin\leftmargini
            \topsep 3\p@ \@plus2\p@ \@minus2.5\p@
            \parsep 0\p@
            \itemsep3\p@ \@plus2\p@ \@minus3\p@}

\partopsep has default value

2.0pt plus 1.0pt minus 1.0pt

If you want the individual lines to match up, then you should also put \itemsep equal to 0pt in the above code.

Beaware that if the titles of the two blocks have different heights/depths then theh body will move accordingly and you will loose your alignment again. You can cover yourself a little by adding an appropriate strut to your block titles.

Note that the above code also kills \topsep for subsquent uses of itemize within the same block. If this is a problem, you might try to just adjust \partopsep to cancel out \topsep and ensure that your subsequent lists in the block do not start in vertical mode.

[Tex/LaTex] Beamer: change default color of item’s indicator in itemize

According to this post on SO: https://stackoverflow.com/questions/2865581/changing-the-colour-of-textbullet-in-latex-beamer

The best solution is:

\setbeamercolor*{item}{fg=color}

Another one but lower interest:

\setbeamercolor{itemize item}{fg=color} % all frames will have red bullets

\begin{frame}

  \begin{itemize}
    \item First item.
    \item Second item.
    \item Third item.
    \item Fourth item.
  \end{itemize}

\end{frame}