[Tex/LaTex] add a fake item in itemize as a placeholder

animationsbeameritemize

How to make phantom item in itemize environment? I want to 'animate' items in my beamer slides, so when I go from one slide to another new item pop up in a right place.
I have workaround for one item but it does not work for two items:

\documentclass[10pt]{beamer}
\usetheme{Warsaw} 
\usecolortheme{whale}
\usepackage{tikz}

\tikzset{sequencestyle/.style={minimum size=0.5cm, draw=gray, line width=1pt, inner sep = 2pt}}{}
\begin{document}

\begin{frame}{first slide}
\begin{itemize}
    \item This is first item.                                                   
    \item[]
    \item[]
\end{itemize}
\begin{tikzpicture}
\node [sequencestyle, fill=red, anchor=west, xshift=-\pgflinewidth] (node1) {A};
\node [sequencestyle, fill=blue, anchor=west, xshift=-\pgflinewidth] at (node1.east) (node1) {B};
\end{tikzpicture}
\end{frame}

\begin{frame}{second slide}
\begin{itemize}
    \item This is first item.
    \item This is second item.
    \item[]
\end{itemize}
\begin{tikzpicture}
\node [sequencestyle, fill=red, anchor=west, xshift=-\pgflinewidth] (node1) {A};
\node [sequencestyle, fill=blue, anchor=west, xshift=-\pgflinewidth] at (node1.east) (node1) {C};
\end{tikzpicture}
\end{frame}

\end{document}

I bet this question is answered somewhere, but I could not find.

EDIT: I updated the code. Besides of adding bullets I update some graphics elements. I added few things as an example.

Best Answer

You can simply use the fact that itemize is overlay-aware and use the [<+->] overlay option. For the elements of the tikzpicture, you can also use the fact that TikZ's commands are overlay aware:

\documentclass[10pt]{beamer}
\usepackage{tikz}

\usetheme{Warsaw} 
\usecolortheme{whale}

\tikzset{
sequencestyle/.style={minimum size=0.5cm, draw=gray, line width=1pt, inner sep = 2pt}
}

\begin{document}

\begin{frame}{first slide}
\begin{itemize}[<+->]
    \item This is the first item.
    \item This is the second item.
    \item This is the third item.
\end{itemize}

\begin{tikzpicture}
\node<1-> [sequencestyle, fill=red, anchor=west, xshift=-\pgflinewidth] (node1) {A};
\node<2-> [sequencestyle, fill=blue, anchor=west, xshift=-\pgflinewidth] at (node1.east) (node2) {B};
\node<3-> [sequencestyle, fill=green, anchor=west, xshift=-\pgflinewidth] at (node1.east) (node2) {C};
\end{tikzpicture}
\end{frame}

\end{document}

enter image description here

Related Solutions

[Tex/LaTex] Item displayed twice in beamer itemize

The issue here is the fact that \pause has global scope within the frame. Putting a \pause somewhere on a slide says "Nothing after this appears on earlier slides.". This cannot be overridden. So all of your \includegraphics commands are wrapped in a "Don't show until after the slide with \pause is visible.". So you need to limit the scope of the \pause.

One way is to explicitly tell beamer which slide each item should appear on by writing something like \item<3->. Another is to exploit the behaviour of beamer when it encounters the <+-> syntax. The advantage of this second way is that it is robust under changing the order of the list, or inserting or removing items. The important thing to know is that when beamer sees a + sign in an overlay specification, such as <+->, then it increments its internal counter which keeps track of what slide stuff should appear on. So each \item<+-> says, "Display this from the next slide onwards." (note that the optional argument to the itemize environment is simply a shortcut way of saying \item<+-> each time). The trick, therefore, is to tell beamer to increment the counter at the time you want the extra pause. The item three, then four will be displayed from overlay 3 onwards, but the item five will wait an extra turn before it is displayed.

There are various ways of achieving this goal. The most direct is simply to write \stepcounter{beamerpauses}. The most indirect is to ensure that beamer sees an extra + somewhere. Indeed, this could be one for an obfuscation competition! Putting \onslide<+>{} or \alert<+>{} or \invisible<+>{}, or indeed any overlay-aware command somewhere on that line will do the trick. I think that my personal favourite would be to write

\visible<-+,+->{Three, then four}

(Note that as the two +s occur in the same overlay specification, the counter is only updated once.) But the \stepcounter is probably the clearest, and the easiest to remember why you put it there in six months' time.

\documentclass{beamer}

\begin{document}
\begin{frame}
\frametitle{Title}
\begin{columns}
\column{.4\textwidth}
  \begin{minipage}[c][.6\textheight][c]{\linewidth}
    \begin{itemize}[<+->]
        \item
            One
        \item
            Two
        \item
            Three, then four
            \stepcounter{beamerpauses}
        \item
            Five
    \end{itemize}
   \end{minipage}
\column{.6\textwidth}
\center
    \includegraphics<1>{fig_1}
    \includegraphics<2>{fig_2}
    \includegraphics<3>{fig_3}
    \includegraphics<4>{fig_4}
    \includegraphics<5>{fig_5}
\end{columns}
\end{frame}
\end{document}

[Tex/LaTex] itemize and \item option

Use a description environment instead of itemize:

\documentclass{article}
\begin{document}
\begin{description}
  \item[foo] text
  \item[bar] text
\end{description}
\end{document}

output

Best Answer

Related Solutions

[Tex/LaTex] Item displayed twice in beamer itemize

[Tex/LaTex] itemize and \item option

Related Question