Simplify the example environments

assets/packages.tex

@@ -109,36 +109,40 @@
 \newcommand{\jip}[1]{\textcolor{red}{\Big[\textbf{Jip}: #1\Big]}}
 
 % Example environment
-\usepackage[many]{tcolorbox}
-\newcounter{example}[chapter]
-\counterwithin{example}{chapter}
-\newenvironment{example}[1][]{\refstepcounter{example}\begin{examplebox}#1}{\end{examplebox}}
+\usepackage{amsthm}
+\usepackage{thmtools}
+\declaretheoremstyle[
+  headfont=\usekomafont{disposition},
+  spaceabove=1em plus 0.75em minus 0.25em,
+	numberwithin=chapter,
+  bodyfont=\normalfont,
+	headformat=\ensuremath{\blacktriangleright} \NAME~\NUMBER\NOTE,
+	headpunct={:},
+	postheadspace=2em,
+	qed=\ensuremath{\blacktriangleleft{}},
+  spacebelow=1em plus 0.75em minus 0.25em,
+]{exmpstyle}
 
-\newtcolorbox{examplebox}[1][]{
-  breakable,
-  enhanced,
-  % skin=enhancedlast,
-  attach boxed title to top left={xshift=-4mm,yshift=-0.5mm},
-  fonttitle=\bfseries\sffamily,
-  attach boxed title to top center,
-  boxed title style={empty,arc=0pt,outer arc=0pt,boxrule=0pt},
-  underlay boxed title={
-      \draw[#1] (title.north west) -- (title.north east) -- +(\tcboxedtitleheight,-\tcboxedtitleheight)
-      -- (title.south west) -- +(-\tcboxedtitleheight,0)-- cycle;
-    },
-  overlay last={
-      \draw[#1] ([xshift=-80pt]frame.south) -- ++ (160pt,0pt);
-      \fill[#1] ([xshift=-30pt,yshift=-1pt]frame.south) rectangle +(60pt,2pt);
-    },
-  overlay unbroken={
-      \draw[#1] ([xshift=-80pt]frame.south) -- ++ (160pt,0pt);
-      \fill[#1] ([xshift=-30pt,yshift=-1pt]frame.south) rectangle +(60pt,2pt);
-    },
-  title={Example \theexample{}},
-  colback=white,
-  coltitle=black,
-  colframe=white,
-}
+\declaretheorem[
+  style=exmpstyle,
+  title=Example,
+  refname={example,examples},
+  Refname={Example,Examples}
+]{example}
+% \newtheoremstyle{example}{}{}{}{}{\usekomafont{disposition}}{. }{5pt plus 1pt minus 1pt}{}
+% Arguments ---
+% Thm head spec
+% Space above
+% Space below
+% Body font
+% Indent amount (empty = no indent, \parindent = para indent)
+% Thm head font
+% Punctuation after thm head
+% Space after thm head: \newline = linebreak
+% --- Note, empty = default value
+
+% \theoremstyle{example}
+% \newtheorem{example}{Example}[chapter]
 
 % Code formatting
 \usepackage[
@@ -148,6 +152,7 @@
 ]{minted}
 \usemintedstyle{borland}
 
+\usepackage[many]{tcolorbox}
 \newtcolorbox{listingbox}[1][]{
   breakable,
   enhanced,