%% 版本：1.0
%% 作者：杨永全
%% 本文件的主要作用是定义主题的框架结构等模板信息
%% 完成时间：2022-05-09

\usepackage{dashrule}


% 页面整体布局，原模板代码
\setbeamersize{%
    text margin left=0.8cm,
    text margin right=0.8cm
}

%% 首页标题背景，原模板代码
\defbeamertemplate{background canvas}{title}{%
    \includegraphics[width=\paperwidth, height=\paperheight]{logos/background.jpg}
}

%% 首页页面顶部元素，原模板代码
\newcommand{\topslider}[1]{%
    \begin{tikzpicture}[overlay, remember picture]
        \draw [fill=#1, draw=none, rounded corners=2pt] (current page.north east)
        [turtle={
            lt, forward=1.1\paperwidth, 
            lt, forward=.19\paperheight, 
            lt, forward=.47\paperwidth, 
            left=45, forward=1.5ex,
            right=45, forward=.63\paperwidth, 
            home
        }];
    \end{tikzpicture}
}

%首页顶栏logo，原模板代码
\newcommand{\banner}{%
    \begin{tikzpicture}[overlay, remember picture]
        \node[anchor=north west, xshift=0.8cm, yshift=-0.6cm] at (current page.north west) {
            \includegraphics[scale=0.02]{logos/ouc_logo.png}
        };
    \end{tikzpicture}
}

%% 底部有弧度的页脚部分，原模板代码
\newcommand{\bottomslider}[1]{%
    \begin{tikzpicture}[overlay, remember picture]
        \draw [fill=#1, draw=none, rounded corners=2pt] (current page.south east)
        [turtle={
            lt, fd=1.1\paperwidth, 
            rt, fd=0.03\paperheight, 
            rt, fd=.8375\paperwidth, 
            lt=45, fd=1.5ex, 
            rt=45, fd=.25\paperwidth, 
            home
        }];
    \end{tikzpicture}
}

%首页右下角网址，原模板代码
\newcommand{\oucurl}{%
    \begin{tikzpicture}[overlay, remember picture]
        \node[anchor=south east, text=oucblue] at (current page.south east) {\tiny www.ouc.edu.cn};
    \end{tikzpicture}
}

%% 首页背景元素，原模板代码
\defbeamertemplate{background}{title}{%
    \topslider{white}
    \banner %首页的Logo
    \bottomslider{white} %首页底部颜色
    \oucurl %首页底部网址
}

%首页正文部分，原模板代码
\defbeamertemplate{title page}{text}{%
    \begin{center} %所有文字居中
    \vspace{2.5cm} %标题距离banner的距离
    \usebeamercolor[white]{title}\usebeamerfont*{title}\strut{}\inserttitle\par%字体颜色为白色
    \vspace{0.5cm}%副标题到主标题的距离
    \usebeamercolor[white]{subtitle}\usebeamerfont{subtitle}\strut{}\insertsubtitle\par%字体为白色
    \vspace{1.6cm}%作者到副标题的距离
    \usebeamercolor[white]{title}\usebeamerfont*{author}\insertauthor\par%字体为白色
    \vspace{0.3cm}%作者单位到作者的距离
    \usebeamercolor[white]{title}\usebeamerfont*{institute}\insertinstitute%\enspace/字体为白色%\enspace
    %\insertdate%如有必要，可再插入日期
    \end{center}
}
%设置首页页面模板，原模板代码
\setbeamertemplate{title page}[text]
\pgfkeys{/beameroucslide/outer/.cd,
    footline/.initial=empty,
    navigation symbols/.initial=empty,
    title page/.initial=text
}

%% 普通页面背景，原模板代码
\defbeamertemplate{background canvas}{empty}{}
\pgfkeys{/beamerhgf/outer/.cd,
    background canvas/.initial=empty
}

%普通页面左下角信息，原模板代码
\setbeamertemplate{footline}{%
    \hspace{0.8cm}
    \usebeamercolor[fg]{title}\insertauthor\enspace\vrule width0.3pt\enspace\inserttitle%左下角作者信息和标题信息
    \vspace{0.04cm} %页脚到底部的距离
}

% 普通页面右下角Logo，原模板代码
\newcommand{\footerlogo}{%
    \begin{tikzpicture}[overlay, remember picture]
        \node[anchor=south east, xshift=-1.8cm, yshift=-0.1cm] at (current page.south east) {
            \includegraphics[scale=0.008]{logos/ouc_logo_bottom.png}
        };
    \end{tikzpicture}
}

%右下角页码导航，原模板代码
\setbeamertemplate{navigation symbols}{%
    \vspace{-6pt}
    \usebeamercolor[fg]{title}\usebeamerfont*{navigation symbols}\insertframenumber/\inserttotalframenumber
}

%% 普通页面frame背景模板，原模板代码
\defbeamertemplate{background}{frame}{%框架
    \bottomslider{oucblue} %底部颜色为海大蓝
    \footerlogo %右下角logo
}

\defbeamertemplate{headline}{empty}{

}%默认标题为空


%普通页面标题设置
\defbeamertemplate{frametitle}{frame}{%
    \vspace{10pt}%
    \usebeamercolor[oucblue]{frametitle}\usebeamerfont{frametitle}
    \thesubsection. \insertsubsection%显示二级标题
    \ifx\insertsubsubsection\empty%如果没有三级标题什么都不做        
    \else
        \usebeamercolor[ouclightblue]{framesubtitle}\usebeamerfont{framesubtitle}
        \thesubsubsection.\insertsubsubsection
    \fi    
    \vspace{0.5pt}%标题到下面的线之间的距离
    {\color{oucblue}\hrule height 1.5pt depth 0pt}%标题下面的线
}

%因为在frame中引入了section，所以要为目录页面单独设置一个frametitle的模板，去掉了section信息
\defbeamertemplate{frametitle}{outlineframe}{
    \vspace{12pt}%
    \usebeamercolor[oucblue]{frametitle}\usebeamerfont{frametitle}
    \insertframetitle
    \usebeamercolor[ouclightblue]{framesubtitle}\usebeamerfont{framesubtitle}
    \insertframesubtitle
    \vspace{0.5pt}%标题到下面的线之间的距离
    {\color{oucblue}\hrule height 1.5pt depth 0pt}%标题下面的线
}

%为普通frame设置模板
\setbeamertemplate{background}[frame]
\setbeamertemplate{frametitle}[frame]

% 定义首页生成命令
\def\maketitle{%
{%
    \setbeamertemplate{footline}{} 
    \setbeamertemplate{navigation symbols}{} 
    \ifbeamer@inframe%
        \titlepage%首页页面
    \else%
        \setbeamertemplate{frame number}[invisible]%
        \setbeamertemplate{date}[invisible]%
        \setbeamertemplate{background canvas}[title]%
        \setbeamertemplate{background}[title]%
        \setbeamertemplate{title page}[title]%
        \frame[t, noframenumbering]{\titlepage}%
    \fi%
}%
    % 将普通的页面模板改回去
    \setbeamertemplate{background canvas}[empty]
    \setbeamertemplate{background}[frame]
    \setbeamertemplate{frametitle}[frame]
}

%% ======================================================================
%%  目录页：自适应方框样式
%% ----------------------------------------------------------------------
%%  把每一个一级标题（\section）放进一个方框里。方框的高度、以及方框内
%%  文字的字号，都会根据一级标题的数目自动计算，并自动均分填满整页。
%%
%%  可调参数（在导言区用 \setlength 覆盖即可）：
%%     \tocareamargin    目录区上下预留的高度（自动模式下 =
%%                       \textheight 减去页眉页脚，默认 52pt）
%%     \tocareaheight    直接指定目录区高度；设为 0pt（默认）表示自动
%%     \tocboxgap        方框之间的理想间距（空间紧张时会自动压缩）
%%     \tocboxgapmin     方框之间允许的最小间距
%%     \tocboxmaxheight  单个方框的最大高度
%%     \tocfontmax       方框内文字的最大字号
%%     \tocfontwarn      字号低于该值时会给出警告（提示章节太多）
%%
%%  方框样式（在导言区用 \settocstyle{...} 选择）：
%%     box     浅色底 + 圆角框 + 圆形序号（默认）
%%     solid   实心色底 + 白色文字
%%     bar     白底 + 左侧粗色条
%%
%%  配色主题（在导言区用 \toctheme{...} 选择）：
%%     red     海大红（默认），与各章节标题页的颜色一致
%%     blue    海大蓝，与目录页上「目录」二字的颜色一致
%% ======================================================================

\newlength{\tocareamargin}
\setlength{\tocareamargin}{52pt}
\newlength{\tocareaheight}
\setlength{\tocareaheight}{\z@}
\newlength{\tocboxgap}
\setlength{\tocboxgap}{10pt}
\newlength{\tocboxgapmin}
\setlength{\tocboxgapmin}{2pt}
\newlength{\tocboxmaxheight}
\setlength{\tocboxmaxheight}{110pt}
\newlength{\tocboxleftpad}
\setlength{\tocboxleftpad}{2.5pt}
\newlength{\tocfontmax}
\setlength{\tocfontmax}{26pt}
\newlength{\tocfontwarn}
\setlength{\tocfontwarn}{8pt}

\makeatletter
\newcount\ouc@toc@count
\newlength\ouc@toc@avail
\newlength\ouc@toc@gap
\newlength\ouc@toc@height
\newlength\ouc@toc@font
\newlength\ouc@toc@base
\newlength\ouc@toc@pad
\newlength\ouc@toc@padx
\newlength\ouc@toc@badgesize
\newlength\ouc@toc@tmp

\def\ouc@toc@style{box}
\newcommand{\settocstyle}[1]{\def\ouc@toc@style{#1}}

%% 配色主题：red = 海大红（默认，与章节标题页同色）
%%           blue = 海大蓝（与目录页标题「目录」同色）
\def\ouc@toc@theme{red}
\newcommand{\toctheme}[1]{%
    \def\ouc@toc@theme{#1}%
    \ifcsname ouc@toc@setcolors@#1\endcsname
        \csname ouc@toc@setcolors@#1\endcsname
    \else
        \PackageWarning{oucslide}{未知的目录页配色 “#1”，
            可选值为 red / blue，这里按 red 处理}%
        \ouc@toc@setcolors@red
    \fi
}
%% 红色主题：主色 oucred，浅底 oucred10
\def\ouc@toc@setcolors@red{%
    \def\ouc@toc@main{oucred}%
    \def\ouc@toc@light{oucred10}%
}
%% 蓝色主题：主色 oucblue，浅底 oucblue10
\def\ouc@toc@setcolors@blue{%
    \def\ouc@toc@main{oucblue}%
    \def\ouc@toc@light{oucblue10}%
}
\ouc@toc@setcolors@red

%% 左对齐时给文字留出的左内边距
\def\ouc@toc@indent{\dimexpr\tocboxleftpad\relax}

\long\def\ouc@toc@gobblevi#1#2#3#4#5#6{}
\long\def\ouc@toc@gobblevii#1#2#3#4#5#6#7{}

%% 方框内文字的字体（字号由 \ouc@toc@compute 算出）
\def\ouc@toc@fontsel{\fontsize{\ouc@toc@font}{\ouc@toc@base}\selectfont\bfseries}

%% 圆形序号徽标（#1 = 圆圈填充色，#2 = 数字）
\def\ouc@toc@badge#1#2{%
    \tikz[baseline=(ouc@badge.base)]{%
        \node[circle, fill=#1, text=white, inner sep=0pt,
              minimum size=\ouc@toc@badgesize, font=\bfseries] (ouc@badge) {\strut#2};%
    }%
}
%% 实心样式下用的空心序号（#1 = 描边色，#2 = 数字）
\def\ouc@toc@badgeopen#1#2{%
    \tikz[baseline=(ouc@badge.base)]{%
        \node[circle, draw=#1, line width=0.8pt, text=#1, inner sep=0pt,
              minimum size=\ouc@toc@badgesize, font=\bfseries] (ouc@badge) {\strut#2};%
    }%
}

%% ---------------------------------------------------------------- 计数
%% 读入上一次编译生成的 .toc 文件，数出一共有多少个一级标题
\def\ouc@toc@countsections{%
    \global\ouc@toc@count\z@
    \begingroup
        \makeatletter
        \def\beamer@sectionintoc##1##2##3##4##5{\global\advance\ouc@toc@count\@ne}%
        \let\beamer@subsectionintoc\ouc@toc@gobblevi
        \let\beamer@subsubsectionintoc\ouc@toc@gobblevii
        \@input{\jobname.toc}%
        \makeatother
    \endgroup
}

%% ------------------------------------------------------------ 计算尺寸
\def\ouc@toc@compute{%
    %% 1. 目录区可用高度
    \ifdim\tocareaheight=\z@
        \setlength{\ouc@toc@avail}{\dimexpr\textheight-\tocareamargin\relax}%
    \else
        \setlength{\ouc@toc@avail}{\tocareaheight}%
    \fi
    \ifnum\ouc@toc@count<\@ne \global\ouc@toc@count\@ne \fi
    %% 2. 间距：理想值 \tocboxgap；空间紧张时压缩，但不小于 \tocboxgapmin
    \setlength{\ouc@toc@gap}{\tocboxgap}%
    \setlength{\ouc@toc@tmp}{%
        \dimexpr\ouc@toc@avail/(\ouc@toc@count+1)*25/100\relax}%
    \ifdim\ouc@toc@gap>\ouc@toc@tmp \setlength{\ouc@toc@gap}{\ouc@toc@tmp}\fi
    \ifdim\ouc@toc@gap<\tocboxgapmin \setlength{\ouc@toc@gap}{\tocboxgapmin}\fi
    %% 3. 方框高度：扣掉 N+1 个间距后，把目录区高度均分给 N 个方框
    \setlength{\ouc@toc@height}{%
        \dimexpr(\ouc@toc@avail-\ouc@toc@count\ouc@toc@gap-\ouc@toc@gap)
        /\ouc@toc@count\relax}%
    \ifdim\ouc@toc@height>\tocboxmaxheight
        \setlength{\ouc@toc@height}{\tocboxmaxheight}\fi
    \ifdim\ouc@toc@height<8pt \setlength{\ouc@toc@height}{8pt}\fi
    %% 4. 字号：随方框高度等比缩放，同时保证文字不会撑破方框
    %%    内边距也随方框高度缩小，避免方框过矮时被 tcolorbox 撑回去
    \setlength{\ouc@toc@pad}{\dimexpr\ouc@toc@height*12/100\relax}%
    \ifdim\ouc@toc@pad>2pt \setlength{\ouc@toc@pad}{2pt}\fi
    \setlength{\ouc@toc@padx}{\dimexpr\ouc@toc@pad*3\relax}%
    \ifdim\ouc@toc@padx<6pt \setlength{\ouc@toc@padx}{6pt}\fi
    %% 序号徽标的直径：随字号缩放，下限 1.15em（免得章节多时圆圈看不清），
    %% 但绝不能超过方框高度，否则会把矮方框撑破
    \setlength{\ouc@toc@badgesize}{\dimexpr\ouc@toc@font*115/100\relax}%
    \ifdim\ouc@toc@badgesize<1.15em \setlength{\ouc@toc@badgesize}{1.15em}\fi
    \ifdim\ouc@toc@badgesize>2.2em \setlength{\ouc@toc@badgesize}{2.2em}\fi
    \setlength{\ouc@toc@tmp}{\dimexpr\ouc@toc@height-2pt\relax}%
    \ifdim\ouc@toc@badgesize>\ouc@toc@tmp \setlength{\ouc@toc@badgesize}{\ouc@toc@tmp}\fi
    \ifdim\ouc@toc@badgesize<4pt \setlength{\ouc@toc@badgesize}{4pt}\fi
    \setlength{\ouc@toc@font}{\dimexpr\ouc@toc@height*40/100\relax}%
    \setlength{\ouc@toc@tmp}{%
        \dimexpr(\ouc@toc@height-2\ouc@toc@pad-2pt)*5/6\relax}%
    \ifdim\ouc@toc@font>\ouc@toc@tmp \setlength{\ouc@toc@font}{\ouc@toc@tmp}\fi
    \ifdim\ouc@toc@font>\tocfontmax \setlength{\ouc@toc@font}{\tocfontmax}\fi
    \ifdim\ouc@toc@font<\tocfontwarn
        \PackageWarning{oucslide}{目录页有 \the\ouc@toc@count\space 个一级标题，
            字号已被压缩到 \the\ouc@toc@font（低于 \the\tocfontwarn）。
            如观感不佳，请减少 section 的数目，或调小 \string\tocareamargin}%
    \fi
    \setlength{\ouc@toc@base}{\dimexpr\ouc@toc@font*6/5\relax}%
}

%% -------------------------------------------------------------- 条目
%% #1 = 序号， #2 = 标题， #3 = 锚点页码
\def\ouc@toc@entry#1#2#3{%
    \ifcsname ouc@toc@entry@\ouc@toc@style\endcsname
        \csname ouc@toc@entry@\ouc@toc@style\endcsname{#1}{#2}{#3}%
    \else
        \PackageWarning{oucslide}{未知的目录页样式 “\ouc@toc@style”，
            可选值为 box / solid / bar，这里按 box 处理}%
        \ouc@toc@entry@box{#1}{#2}{#3}%
    \fi
}

%% 样式 box：浅色底 + 圆角框 + 圆形序号，文字左对齐（左侧留白）
\def\ouc@toc@entry@box#1#2#3{%
    \begin{tcolorbox}[width=\textwidth, height=\ouc@toc@height,
        valign=center, halign=left, arc=3pt, boxrule=0.8pt,
        colframe=\ouc@toc@main, colback=\ouc@toc@light, coltext=\ouc@toc@main,
        left=\ouc@toc@indent, right=\ouc@toc@padx, top=\ouc@toc@pad, bottom=\ouc@toc@pad,
        boxsep=0pt, before skip=0pt, after skip=0pt,
        fontupper=\ouc@toc@fontsel]%
        \ouc@toc@badge{\ouc@toc@main}{#1}%
        \hspace{0.8em}\hyperlink{Navigation#3}{#2}%
    \end{tcolorbox}%
}

%% 样式 solid：实心色底 + 白字，文字左对齐（左侧留白）
\def\ouc@toc@entry@solid#1#2#3{%
    \begin{tcolorbox}[width=\textwidth, height=\ouc@toc@height,
        valign=center, halign=left, arc=3pt, boxrule=0pt,
        colframe=\ouc@toc@main, colback=\ouc@toc@main, coltext=white,
        left=\ouc@toc@indent, right=\ouc@toc@padx, top=\ouc@toc@pad, bottom=\ouc@toc@pad,
        boxsep=0pt, before skip=0pt, after skip=0pt,
        fontupper=\ouc@toc@fontsel]%
        \ouc@toc@badgeopen{white}{#1}%
        \hspace{0.8em}\hyperlink{Navigation#3}{#2}%
    \end{tcolorbox}%
}

%% 样式 bar：白底 + 左侧粗色条 + 圆形序号，文字左对齐（左侧留白）
\def\ouc@toc@entry@bar#1#2#3{%
    \begin{tcolorbox}[width=\textwidth, height=\ouc@toc@height,
        valign=center, halign=left, arc=0pt, boxrule=0.5pt,
        leftrule=8pt, colframe=\ouc@toc@main, colback=white, coltext=black,
        left=\ouc@toc@indent, right=\ouc@toc@padx, top=\ouc@toc@pad, bottom=\ouc@toc@pad,
        boxsep=0pt, before skip=0pt, after skip=0pt,
        fontupper=\ouc@toc@fontsel]%
        \ouc@toc@badge{\ouc@toc@main}{#1}%
        \hspace{0.8em}\hyperlink{Navigation#3}{#2}%
    \end{tcolorbox}%
}

%% ---------------------------------------------------------- 目录页正文
%% 逐条读入 .toc，把每个一级标题渲染成一个方框；
%% 方框之间、方框与页面上下边缘之间各放一个 \vfill，
%% 由 beamer 自动等分剩余空间，从而刚好铺满整页。
\def\ouc@toc@body{%
    \ouc@toc@countsections
    \ouc@toc@compute
    \begingroup
        \makeatletter
        \let\beamer@subsectionintoc\ouc@toc@gobblevi
        \let\beamer@subsubsectionintoc\ouc@toc@gobblevii
        \def\beamer@sectionintoc##1##2##3##4##5{%
            \vfill\ouc@toc@entry{##5}{##2}{##3}%
        }%
        \@input{\jobname.toc}%
        \makeatother
        \vfill
    \endgroup
}

%定义目录页生成命令
\def\makeoutline{
    {
        \setbeamertemplate{frametitle}[outlineframe]
        \begin{frame}
            \frametitle{目录}
            \ouc@toc@body
        \end{frame}
        
    }
    %再把模板改回去
    \setbeamertemplate{frametitle}[frame]
}
\makeatother

%定义最后一页生成命令
\def\makelast{
    \setbeamertemplate{background}[title]
    \setbeamertemplate{background canvas}[title]%
    \setbeamertemplate{frame number}[invisible]%
    \setbeamertemplate{footline}{} 
    \setbeamertemplate{navigation symbols}{} 
    \begin{frame}
        \begin{center} %所有文字居中
            \vspace{3.5cm}
            \huge\textcolor{white}{\textbf{\last}}%致谢词
        \end{center}
    \end{frame}
}

% 分节页面
\AtBeginSection[]{
    \begin{frame}%
        \begin{center} %所有文字居中
        \vspace{2.5cm}%
        \huge\textcolor{oucred}{\textbf{\thesection.\insertsectionhead}}%
        \end{center}
    \end{frame}%
}

%目录样式
\setbeamertemplate{section in toc}[sections numbered]
\setbeamercolor{section in toc}{bg=white,fg=oucred}

%设置有代码块的frame
\newenvironment{fragileframe}%
  {\begin{frame}[fragile,environment=fragileframe]}%
  {\end{frame}}