feat: add customization of bar line width (#42)

Adds the ability to set the line width of the progress bars and title
separator (on the title page) through `progressbar linewidth` and
`titleseparator linewidth`. Closes #41.

examples/demo/demo.tex

@@ -75,7 +75,6 @@
 \molochset{titleformat frame=smallcaps}
 \begin{frame}
 \frametitle{Small Caps}
-  This frame uses the \texttt{smallcaps} title format.
 
   \begin{alertblock}{Potential Problems}
     Be aware that not every font supports small caps. If you use the Computer (or Latin) Modern Sans Serif font, for instance, text in small caps will just be typeset in a normal font.
@@ -264,6 +263,48 @@
   \end{columns}
 \end{frame}
 
+\begin{frame}[c]
+  \frametitle{Progress Bars}
+
+  A prominent feature of \themename is the use of progress bars to
+  visualize the progress of the presentation. \medskip
+
+  By default bars are shown on section pages, but this can be toggled
+  through \texttt{sectionpage=progressbar|simple|none} and also enabled for 
+  subsection pages through \texttt{subsectionpage=progressbar}.\medskip
+
+  
+  Finally, you can enable progress bars on frames by setting 
+  \texttt{progressbar=none|head|frametitle|foot} (depending on where
+  you'd like the bar to be placed).\medskip
+\end{frame}
+
+\begin{frame}[c,fragile]
+  \frametitle{Progress Bar Customization}
+  You can customize the width of the bars using
+  \texttt{progressbar linewidth=<length>}.\medskip
+
+  On the following pages, we have set
+\begin{verbatim}\molochset{
+  progressbar=frametitle,
+  progressbar linewidth=1pt
+}
+\end{verbatim}
+  to enable progress bars below the frame title and set its width to 1pt.
+\end{frame}
+
+\molochset{progressbar=frametitle,progressbar linewidth=1pt}
+
+\begin{frame}[c,fragile]
+  \frametitle{The Title Page}
+
+  There is only very little customization available of the title page at the
+  time of writing.\medskip
+
+  But you can at least modify the line width of the title separator
+  by setting \texttt{titleseparator linewidth=<length>}
+\end{frame}
+
 \begin{frame}
 \frametitle{Math}
   \begin{equation*}

src/beamerinnerthememoloch.dtx

@@ -117,6 +117,29 @@
 %    \end{macrocode}
 % \end{macro}
 %
+% \begin{macro}{titleseparator linewidth}
+%    Set the width of the line separating the title from the author.
+%    \begin{macrocode}
+\newlength{\moloch@titleseparator@linewidth}
+\pgfkeys{
+  /moloch/inner/.cd,
+  titleseparatorlinewidth/.code={\setlength{\moloch@titleseparator@linewidth}{#1}},
+  titleseparatorlinewidth/.default=0.4pt,
+}
+%    \end{macrocode}
+% \end{macro}
+%
+%
+% \begin{macro}{titleseparator aliases}
+%    Allows |titleseparator linewidth| to be used in |\usetheme|.
+%    \begin{macrocode}
+\pgfkeys{
+  /moloch/inner/.cd,
+  titleseparator linewidth/.code=\pgfkeysalso{titleseparatorlinewidth=#1},
+}
+%    \end{macrocode}
+% \end{macro}
+%
 % \begin{macro}{\moloch@inner@setdefaults}
 % Set default values for inner theme options.
 %    \begin{macrocode}
@@ -124,7 +147,8 @@
   \pgfkeys{/moloch/inner/.cd,
     sectionpage=progressbar,
     subsectionpage=none,
-    standoutnumbering=none
+    standoutnumbering=none,
+    titleseparator linewidth=0.4pt,
   }
 }
 %    \end{macrocode}
@@ -205,7 +229,6 @@
   \raggedright%
   \moloch@titleformat{\inserttitle}%
   \par%
-  \vspace*{0.2em}
 }
 %    \end{macrocode}
 % \end{macro}
@@ -214,26 +237,23 @@
 %   Set the subtitle on the title page.
 %    \begin{macrocode}
 \setbeamertemplate{subtitle}{
-  \vspace*{0.1em}
+  \vspace*{0.3em}
   \raggedright%
   \moloch@subtitleformat{\insertsubtitle}%
   \par%
-  \vspace*{0.2em}
 }
 %    \end{macrocode}
 % \end{macro}
 %
 % \begin{macro}{title separator}
-%   Template to set the title graphic in a zero-height box. (It won't
+%   Template to set the title separator.
-%   change the position of other elements.)
 %    \begin{macrocode}
-\newlength{\moloch@titleseparator@linewidth}
-\setlength{\moloch@titleseparator@linewidth}{0.4pt}
 \setbeamertemplate{title separator}{
   \tikzexternaldisable%
-  \begin{tikzpicture}
+  \begin{tikzpicture}[baseline=(current bounding box.north)]
     \mmzUnmemoizable%
     \fill[fg] (0,0) rectangle (\textwidth, \moloch@titleseparator@linewidth);
+    \useasboundingbox (0,0) rectangle (\textwidth,-\moloch@titleseparator@linewidth);
   \end{tikzpicture}%
   \tikzexternalenable%
   \par%
@@ -296,7 +316,7 @@
       \insertsubsectionhead%
     \fi
   \end{center}
-  \vspace{\baselineskip - 1ex + 0.4pt}
+  \vspace{\baselineskip - 1ex + \moloch@titleseparator@linewidth}
 }
 \defbeamertemplate{section page}{progressbar}{
   \centering
@@ -366,15 +386,12 @@
 %   |progress bar in head/foot|.
 %
 %    \begin{macrocode}
-\newlength{\moloch@progressonsectionpage}
-\newlength{\moloch@progressonsectionpage@linewidth}
-\setlength{\moloch@progressonsectionpage@linewidth}{0.4pt}
 \setbeamertemplate{progress bar in section page}{
   \pgfmathsetlength{\moloch@progressonsectionpage}{
     \textwidth * min(1,\insertframenumber/\inserttotalframenumber)
   }%
   \tikzexternaldisable%
-  \begin{tikzpicture}
+  \begin{tikzpicture}[baseline=(current bounding box.north)]
     \mmzUnmemoizable%
     \fill[bg]
     (0,0)
@@ -385,6 +402,7 @@
     rectangle
     (\moloch@progressonsectionpage,
     \moloch@progressonsectionpage@linewidth);
+    \useasboundingbox (0,0) rectangle (\textwidth,-\moloch@progressonsectionpage@linewidth);
   \end{tikzpicture}%
   \tikzexternalenable%
 }

src/beamerouterthememoloch.dtx

@@ -71,12 +71,41 @@
 %    \end{macrocode}
 % \end{macro}
 %
+% \begin{macro}{progressbar linewidth}
+%    Sets the linewidth of the progress bar for sectionpages and frames.
+%    \begin{macrocode}
+\newlength{\moloch@progressonsectionpage}
+\newlength{\moloch@progressonsectionpage@linewidth}
+\newlength{\moloch@progressinheadfoot}
+\newlength{\moloch@progressinheadfoot@linewidth}
+\pgfkeys{
+  /moloch/outer/.cd,
+  progressbarlinewidth/.code={
+      \setlength{\moloch@progressonsectionpage@linewidth}{#1}
+      \setlength{\moloch@progressinheadfoot@linewidth}{#1}
+    },
+  progressbarlinewidth/.default=0.4pt,
+}
+%    \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{progressbar aliases}
+%    Allows |progressbar linewidth| to be used in |\molochset|.
+%    \begin{macrocode}
+\pgfkeys{
+  /moloch/outer/.cd,
+  progressbar linewidth/.code=\pgfkeysalso{progressbarlinewidth=#1},
+}
+%    \end{macrocode}
+% \end{macro}
+%
 % \begin{macro}{\moloch@outer@setdefaults}
 %    Sets default values for outer theme options.
 %    \begin{macrocode}
 \newcommand{\moloch@outer@setdefaults}{
   \pgfkeys{/moloch/outer/.cd,
     progressbar=none,
+    progressbar linewidth=0.4pt,
   }
 }
 %    \end{macrocode}%
@@ -210,9 +239,6 @@
 %    on each page. Much of this code is duplicated in the inner theme's
 %    template |progress bar in section page|.
 %    \begin{macrocode}
-\newlength{\moloch@progressinheadfoot}
-\newlength{\moloch@progressinheadfoot@linewidth}
-\setlength{\moloch@progressinheadfoot@linewidth}{0.4pt}
 \setbeamertemplate{progress bar in head/foot}{
   \nointerlineskip%
   \pgfmathsetlength{\moloch@progressinheadfoot}{%

testfiles/test.tlg

@@ -392,12 +392,12 @@ Completed box being shipped out [2]
 .......\pdfcolorstack 0 push {0.92157 0.50587 0.10588 rg 0.92157 0.50587 0.10588 RG}
 .......\glue(\parskip) 0.0
 .......\glue(\parskip) 0.0
-.......\glue(\baselineskip) 17.6
+.......\glue(\baselineskip) 18.0
-.......\hbox(0.4+0.0)x241.99265
+.......\hbox(0.0+0.79999)x241.99265
 ........\hbox(0.0+0.0)x0.0
-........\hbox(0.4+0.0)x241.99265
+........\hbox(0.79999+0.0)x241.99265, shifted 0.79999
 .........\glue 0.0
-.........\hbox(0.0+0.0)x0.0
+.........\hbox(0.0+0.0)x0.0, shifted -0.4
 ..........\pdfliteral{q }
 ..........\pdfliteral{0.92157 0.50587 0.10588 RG }
 ..........\pdfliteral{0.92157 0.50587 0.10588 rg }
@@ -405,6 +405,7 @@ Completed box being shipped out [2]
 ..........\hbox(0.0+0.0)x0.0
 ...........\pdfliteral{q }
 ...........\glue 0.0
+...........\glue 0.0
 ...........\pdfliteral{q }
 ...........\pdfcolorstack 0 push {0.83824 0.77588 0.71588 rg 0.83824 0.77588 0.71588 RG}
 ...........\pdfliteral{0.0 0.0 m }
@@ -433,7 +434,10 @@ Completed box being shipped out [2]
 ...........\pdfcolorstack 0 pop
 ...........\pdfliteral{Q }
 ...........\glue 0.0
+...........\glue 0.0
+...........\glue 0.0
 ...........\pdfliteral{Q }
+...........\glue 0.0
 ...........\glue 0.0 plus 1.0fil minus 1.0fil
 ..........\pdfliteral{n }
 ..........\pdfliteral{Q }
@@ -445,7 +449,7 @@ Completed box being shipped out [2]
 .......\pdfcolorstack 0 push {0.13725 0.2157 0.23137 rg 0.13725 0.2157 0.23137 RG}
 .......\glue(\parskip) 0.0
 .......\glue(\parskip) 0.0
-.......\glue(\baselineskip) 4.20004
+.......\glue(\baselineskip) 3.40005
 .......\hbox(9.79996+4.20004)x241.99265, glue set 120.99632fil
 ........\hbox(0.0+0.0)x0.0
 ........\rule(9.79996+4.20004)x0.0