Merge pull request #72 from benjamin-weiss/invert

added invertcolors option

README.md

@@ -66,6 +66,7 @@ the slides, i.e.
   in following format: #current/#total. By default, just current page number is
   printed.
 * Option `noslidenumbers` omits slide numbers entirely.
+* Option `darkcolors` makes the background dark and the foreground light.
 
 #### Color customization
 

beamercolorthememetropolis.dtx

@@ -83,6 +83,16 @@
 }
 %    \end{macrocode}
 %
+% darkcolors
+%
+%    \begin{macrocode}
+\newif\if@beamer@metropolis@darkcolors
+\@beamer@metropolis@darkcolorsfalse
+\DeclareOptionBeamer{darkcolors}{
+    \@beamer@metropolis@darkcolorstrue
+}
+%    \end{macrocode}
+%
 % Unknown option error handling
 %
 %    \begin{macrocode}
@@ -104,10 +114,17 @@
 % Base Colors
 %
 %    \begin{macrocode}
-\setbeamercolor{normal text}{%
+\if@beamer@metropolis@darkcolors
-  fg=mDarkTeal,
+  \setbeamercolor{normal text}{%
-  bg=black!2
+    fg=black!2,
-}
+    bg=mDarkTeal
+  }
+\else
+  \setbeamercolor{normal text}{%
+    fg=mDarkTeal,
+    bg=black!2
+  }
+\fi
 \setbeamercolor{alerted text}{%
   fg=mLightBrown
 }

beamerthemem.dtx

@@ -141,6 +141,14 @@
 }
 %    \end{macrocode}
 %
+% darkcolors
+%
+%    \begin{macrocode}
+\DeclareOptionBeamer{darkcolors}{
+  \PassOptionsToPackage{darkcolors}{beamercolorthememetropolis}%
+}
+%    \end{macrocode}
+%
 % Unknown option error handling
 %
 %    \begin{macrocode}