pgfpositionnodelater 与嵌套 \tikz 环境（PGF 2.1 -> 3.0 升级的问题）

Question

因此我继续前进并制定了一个非常糟糕的解决方法。

即将各个节点放置在不可见的层上以获取它们的高度和宽度，然后将它们再次放置在实际画布上。

值得注意的是，如果你在宏中使用递归，这将需要指数相对于递归深度的时间。

我将其发布在这里以供后人参考，但请让我声明，这是一种解决此问题的糟糕方法，并且我已经确信 PGF 3.0 处理递归的方式是一个错误。

\documentclass[crop]{article}

 \usepackage{tikz}
 \usepackage{xparse}
 \usepackage{ifthen}

 \usetikzlibrary{
   positioning,
 }

 \makeatletter
 \ExplSyntaxOn

% Width and height detection from : http://tex.stackexchange.com/questions/8691/widthof-within-tikzpicture
\newcommand\getwidthofnode[2]{%
    \pgfextractx{\pgf@xb}{\pgfpointanchor{#2}{east}}%
    \pgfextractx{\pgf@xa}{\pgfpointanchor{#2}{west}}%
    \pgfmathsetmacro{#1}{\pgf@xb-\pgf@xa}%
}

\newcommand\getheightofnode[2]{%
    \pgfextracty{\pgf@yb}{\pgfpointanchor{#2}{north}}%
    \pgfextracty{\pgf@ya}{\pgfpointanchor{#2}{south}}%
    \pgfmathsetmacro{#1}{\pgf@yb -\pgf@ya}%
}

% Invisible layer code from : http://tex.stackexchange.com/questions/237109/how-to-have-an-invisible-layer-in-tikz
\pgfdeclarelayer{pgf@invisible}
\pgfsetlayers{main,pgf@invisible}
\def\pgfsetinvisiblelayers#1{\def\pgf@layers@invisible{#1}}
\pgfsetinvisiblelayers{pgf@invisible}

\def\pgf@dolayer#1,#2,\relax{%
  % Is layer declared as invisible...?
  \edef\pgf@marshal{\noexpand\pgfutil@in@{,#1,}{,\pgf@layers@invisible,}}%
  \pgf@marshal%
  \ifpgfutil@in@% Yep. So do nothing.
  \else% Nope. So, insert box.
    \def\pgf@test{#1}%
    \ifx\pgf@test\pgf@maintext%
      \box\pgf@layerbox@main%
    \else%
      \pgfsys@beginscope%
        \expandafter\box\csname pgf@layerbox@#1\endcsname%
      \pgfsys@endscope%
    \fi%
  \fi
  \def\pgf@test{#2}%
  \ifx\pgf@test\pgfutil@empty%
  \else%
    \pgf@dolayer#2,\relax%
  \fi%
}

 % Define an identifier and a set of TIKZ commands so that you can get bounding
 % box information before you place a node. 
 % #1 = identifier for the stuff you place 
 % #2 = tikz code you wish to place later
 \DeclareDocumentCommand \placenodelater {d() +m}{
   % Debug
   \typeout{Starting_placenodelater_for_#1.}    

   % Save the Nodes to be placed as a macro
   \cs_set_protected:cpn {pgf@#1-data}{#2}

   % Place them on an invisible layer
   \begin{pgfonlayer}{pgf@invisible}
     \node[
       ,inner~sep=0
       ,outer~sep=0
     ](pgf@#1-invisible-placement){
       \tikz[]{
         \use:c {pgf@#1-data}
       }
     };
   \end{pgfonlayer}

  % Get the height and width (these were all I needed, you can figure out 
  % other positioning information)
  \getheightofnode{\pgf@temphei}{pgf@#1-invisible-placement}
  \getwidthofnode{\pgf@tempwid}{pgf@#1-invisible-placement}

  % Copy that into the global vars I use to access them 
  \cs_gset_eq:cN {pgf@#1-height} \pgf@temphei
  \cs_gset_eq:cN {pgf@#1-width} \pgf@tempwid

  % Debug information
  \typeout{__pgf@#1-save-macro_data_:}
  \typeout{_____height_:_\use:c{pgf@#1-height}}
  \typeout{_____width__:_\use:c{pgf@#1-width}}
  \typeout{Ending_placenodelater_for_#1.}
 }

 % Place the node previously specified with the \placenodelater command
 % #1 = identifier for nodes already saved by \placenodelater
 % #2 = location for the node to be placed at
 \DeclareDocumentCommand \placenodenow {d() +m}{
   % Debug
   \typeout{Starting_placenodenow_for_#1.}

   % Save the current transformation
   \pgfgettransform{\pgf@savedtransform}
   % Move the center of the transformation to the placement point specified in
   % #2
   \pgftransformshift{#2}
   % Place all the saved nodes
   \use:c{pgf@#1-data}
   % Reset the transformation
   \pgfsettransform{\pgf@savedtransform}
   % Debug information at time of placement
   \typeout{__#1_data_:}
   \typeout{_____height_:_\use:c{pgf@#1-height}}
   \typeout{_____width__:_\use:c{pgf@#1-width}}
   % Debug
   \typeout{Ending_placenodenow_for_#1.}
 }

 % #1 = Module Name 
 % #2 = Module Label
 % #3 = Submodule definitions
 \DeclareDocumentCommand \nestedmodule {d() +m +m} {

   \ifthenelse{\isundefined\prevnode}
   {
     \tikzstyle{modulepositioning}=[]
   }
   {
     \tikzstyle{modulepositioning}=[
       ,below=of~\prevnode.south~west
       ,anchor=north~west
     ]
   }
   % Create the enclosing node for our module
   \node[
       ,rectangle
       ,modulepositioning
       ,draw,red
   ](#1){
     \tikz[remember~picture]{
       % Create all the submodules before we place them
       \placenodelater(#1-mod-store){ 
         % Create node containing submodules
         \node[
           ,draw,blue
           ,anchor=west
           ,remember~picture
         ](#1modbox){
           \tikz[remember~picture]{
               \let\prevnode\undefined
               % Place all subnodes 
               #3
           }
         };
       }
       \pgfmathsetmacro{\centralheight}{\use:c{pgf@#1-mod-store-height}}
       % Create a main node that's large
         \node[
         ,draw,black
         ,remember~picture
         ,inner~sep=5pt
         ,minimum~width=40pt
         ,minimum~height=\centralheight
       ](#1label){
         #2
       };
 %      % Place sub-modules
       \placenodenow(#1-mod-store){\pgfpointanchor{#1label}{east}}
     }
   };
   % Set self as previous for next node
 %  \cs_set_eq:cN {prevnode} {#1}
     \def\prevnode{#1}
 } 

 \ExplSyntaxOff
 \makeatother
\begin{document}
 \begin{tikzpicture}[remember picture,inner sep =1pt,node distance = 5pt]
     \nestedmodule(root){root}{
       \nestedmodule(port-1){p1}{
         \nestedmodule(port-1-1){p11}{
         };
         \nestedmodule(port-1-2){p12}{
         };
       };
       \nestedmodule(port-2){p2}{
       };
     };
 \end{tikzpicture}
\end{document}

值得注意的是，此代码还存在许多其他问题，包括 latex3 的错误使用和总体上缺乏稳定性。我不知道它与其他 PGF/TikZ 功能（如旋转和变换）配合得如何。

Answer 1