Issue #9 invalid

Blocks and itemize: incompatibility?

Anonymous created an issue

I discovered the problem while trying to use blocks as containers/frames for images: the title works as caption.

If I have only blocks in the page, I can make them appear using the <n-> notation, but if I also have an itemize environment in the page, they don't work anymore: when using "transparent" they appear according to the specifications, but they are transparent until the last step of the slide.

Examples are given here, where I asked before making further tests and finding it could be a bug of beamer:

http://groups.google.com/group/comp.text.tex/browse_thread/thread/ddede6ed0723e742

Comments (10)

  1. Anonymous

    Workaround: if the block environments appear before the itemize, the problem disappears.

  2. Vedran Miletić repo owner

    Sure, I made one when testing. Here it is:

    \documentclass{beamer}
    \usecolortheme{crane}
    
    \setbeamercovered{transparent} 
    
    \begin{document}
    
    \begin{frame}
    \frametitle{Title}
    
      \begin{itemize}
        \item text1
        \pause
        \item text2
        \pause
        \item text3
        \pause
        \item text4
        \pause
      \end{itemize}
    
      \begin{onlyenv}<2->
        \begin{block}{Caption1}
        \end{block}
      \end{onlyenv}
      \begin{onlyenv}<3->
        \begin{block}{Caption2}
        \end{block}
      \end{onlyenv}
    
    \end{frame}
    
    \end{document}
    
  3. Joseph Wright

    I did a bit of testing, and things are more subtle than I expected. The problem only shows up when the block statements have overlay specs which come after other items. For example, if you try

    \documentclass{beamer}
    \usecolortheme{crane}
    
    \setbeamercovered{transparent} 
    
    \begin{document}
    
    \begin{frame}
    \frametitle{Title}
    
      \begin{itemize}
        \item text1
        \pause
        \item text2
        \item text3
        \item text4
      \end{itemize}
    
      \begin{onlyenv}<2->
        \begin{block}{Caption1}
        \end{block}
      \end{onlyenv}
      \begin{onlyenv}<3->
        \begin{block}{Caption2}
        \end{block}
      \end{onlyenv}
    
    \end{frame}
    
    \end{document}
    

    or

    \documentclass{beamer}
    \usecolortheme{crane}
    
    \setbeamercovered{transparent} 
    
    \begin{document}
    
    \begin{frame}
    \frametitle{Title}
    
      \begin{itemize}
        \item text1
        \pause
        \item text2
        \pause
        \item text3
        \item text4
      \end{itemize}
    
      \begin{onlyenv}<3->
        \begin{block}{Caption1}
        \end{block}
      \end{onlyenv}
      \begin{onlyenv}<3->
        \begin{block}{Caption2}
        \end{block}
      \end{onlyenv}
    
    \end{frame}
    
    \end{document}
    

    then all is fine. So it's not the itemize itself, I think, but the mix of overlay requirements.

  4. Vedran Miletić repo owner

    I looked at it, but looks very nontrivial. I had no particular idea in mind where to start, but likely pause will have to be implemented in a different way.

    Joseph, can you look at it?

  5. Gábor Braun

    Opinion: \pause causes anything following it hidden, overwriting overlay specifications of following material. In particular, it has nothing to do with itemize or block.

    Example:

    \documentclass{beamer}
    \usecolortheme{crane}
    
    \setbeamercovered{transparent}
    
    \begin{document}
    
    \begin{frame}{Title}
    
    text1
    \pause
    text2
    \pause
    text3
    \pause
    text4
    \pause
    
    \begin{onlyenv}<2->
      Caption1
    \end{onlyenv}
    \uncover<3->{Caption2}
    
    \end{frame}
    
    \end{document}
    
  6. Joseph Wright

    Re-reading the documentation Till wrote, this is pretty much spot-on. Till does say that \pause lasts until the next \pause or the end of the frame, so while this may be a bit odd it's consistent with the docs. That makes this INVALID (not a criticism of the report).

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