具有表状结构的多部分节点，用于表示 Git 中提交、标记或树对象的内部结构

Question

我想重新创建一种节点来表示 Git 中的提交、标记或树对象，如下所示

也就是说，我希望节点具有类似表格的内部结构，表示对象的内部结构。我不需要这些内部线条的宽度不同。

如果能够引用节点的各个部分就好了，这样就可以从特定的内部部分绘制线条或箭头，有点像下图这样：

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我发现最接近的解决方案是多部分节点与多部分子部分——样式问题问题。那里提出的解决方案是使用tabular设置\arrayrulewidth为 TikZ 线宽 - 但是使用此解决方案无法单独处理子节点。

Answer 1

您可以使用pics 和矩阵使得这些形状中的节点可从外部访问。

\documentclass[tikz,border=3mm]{standalone}
\usetikzlibrary{matrix}
\tikzset{mmat/.style={matrix of nodes,inner sep=-0.4pt,
    nodes={anchor=center,draw,text height=1.1em,text depth=0.35ex,inner sep=2pt},
    row sep=-\pgflinewidth,column sep=-\pgflinewidth,
    ampersand replacement=\&},
  pics/commit/.style n args={3}{code={
  \matrix (-mat)[mmat,fill=green!20,
    column 1/.style={nodes={text width=5em-4pt,font=\sffamily,align=center}},
    column 2/.style={nodes={text width=5em-4pt,font=\ttfamily,align=center}}]{%
    #1
    };
    \node[font=\tiny,opacity=0,text width=10em-10pt,anchor=north](tmp)
        at (-mat.south){#2};
    \draw[fill=green!20,very thick,rounded corners=2pt] 
      (-mat.north west)|- ([yshift=2em]-mat.north east) 
      [sharp corners]-- (-mat.north east)    -- cycle
      [rounded corners=2pt]
      (-mat.south west) |- (tmp.south-|-mat.south east) 
      [sharp corners]-- (-mat.south east)    -- cycle;
    \draw[very thick]  (-mat.north west) -- (-mat.south west)   
    (-mat.north east) -- (-mat.south east)
    ([xshift=-3em]-mat.north east) -- ++ (0,2em);
    \path (-mat.north west) 
      node[anchor=south west,font=\sffamily\bfseries,inner sep=6pt]{commit}
      (-mat.north east) 
      node[anchor=south east,font=\sffamily,inner sep=6pt,text=gray]{size}; 
    \node[font=\tiny,text width=10em-10pt,anchor=north,text=gray](-message)
        at (-mat.south){#2};
    \node[anchor=south,font=\small\ttfamily]
     (-label) at ([yshift=2em]-mat.north){#3};
    }},
  pics/tree/.style n args={2}{code={
  \matrix (-mat)[mmat,fill=blue!20,
    column 1/.style={nodes={text width=3em-4pt,font=\sffamily,align=center}},
    column 2/.style={nodes={text width=3em-4pt,font=\ttfamily,align=center}},
    column 3/.style={nodes={text width=4em-4pt,font=\ttfamily,align=center}},
    ]{%
    #1
    };
    \draw[fill=blue!20,very thick,rounded corners=2pt] 
      (-mat.north west)|- ([yshift=2em]-mat.north east) 
      [sharp corners]-- (-mat.north east)    -- cycle
      ;
    \draw[very thick,rounded corners=2pt]  (-mat.north west) |- (-mat.south)    
        -|(-mat.north east) 
    ([xshift=-3em]-mat.north east) -- ++ (0,2em);
    \path (-mat.north west) 
      node[anchor=south west,font=\sffamily\bfseries,inner sep=6pt]{tree}
      (-mat.north east) 
      node[anchor=south east,font=\sffamily,inner sep=6pt,text=gray]{size}; 
    \node[anchor=south,font=\small\ttfamily]
     (-label) at ([yshift=2em]-mat.north){#2};
    }},
  pics/blob/.style n args={2}{code={
    \node[font=\tiny,opacity=0,text width=10em-10pt,anchor=north](tmp)
        at (0,0){#1};
    \draw[fill=red!20,very thick,rounded corners=2pt] 
      ([yshift=2em]tmp.north west) rectangle (tmp.south east);
    \node[font=\tiny,text width=10em-10pt,anchor=north](-message)
        at (0,0){#1};
    \draw[very thick]  (tmp.north west) -- 
    (tmp.north east) 
    ([xshift=-3em]tmp.north east) -- ++ (0,2em);
    \path (tmp.north west) 
      node[anchor=south west,font=\sffamily\bfseries,inner sep=6pt]{blob}
      (tmp.north east) 
      node[anchor=south east,font=\sffamily,inner sep=6pt,text=gray]{size}; 
    \node[anchor=south,font=\small\ttfamily]
     (-label) at ([yshift=2em]tmp.north){#2};
    }},
    }
\begin{document}
\begin{tikzpicture}
 \path (0,0) pic (commit1) {commit={%
    tree \& |[alias=-p12]|0de24\\
    parent \& nil\\
 }{%
 my commit message goes here and is really really cool}{%
 98ca9..}}
 (5,0) pic (tree1) {tree={%
 tree \& e8455 \& |[alias=-p13]| README\\
 tree \& e8455 \& README\\
 }{%
 98ca9..}}
 (10,0) pic (blob1) {blob={%
 require\\
 require}{%
 98ca9..}};
 \draw[very thick,-stealth] (commit1-p12.east) to[bend left] (tree1-label);
 \draw[very thick,-stealth] (tree1-p13.east) to[bend left] (blob1-label);
\end{tikzpicture}
\end{document}