Padrão de limite dentro do nó tikz

Question

Quero criar uma árvore no tikz, onde destaco certos nós usando um padrão. No entanto, quero limitar o padrão dentro dos retângulos de forma que o texto fique visível em um fundo branco.

Aqui está o MWE:

\documentclass{article}
\usepackage{graphicx} 

\usepackage{tikz}
\usetikzlibrary{patterns,trees}

\begin{document}

\begin{tikzpicture}[
  every node/.style={rectangle,draw,align=center, minimum height=0.5cm},
  grandchild/.style={grow=down,xshift=0.5em,anchor=west,
    edge from parent path={(\tikzparentnode.south) |- (\tikzchildnode.west)}},
  first/.style={level distance=7mm},
  second/.style={level distance=14mm},
  third/.style={level distance=21mm},
  level 1/.style={sibling distance=12em}]
    \node[font = {\small\bfseries}] {This is a very long root}
    [edge from parent fork down,level distance=10mm]
    child{node[font = {\footnotesize}, style={}] {Foo\\[-0.3mm]Bar}
    [edge from parent fork down,level distance=10mm]
      child[style={sibling distance=6em, level distance=10mm}] {node[font = {\footnotesize}, ]{Alpha}}
      child[style={sibling distance=6em, level distance=10mm}] {node[font = {\footnotesize}]{Beta}
      }
      child[style={sibling distance=6em, level distance=10mm,}] {node[font = {\footnotesize},preaction={clip, postaction={pattern=north west lines, pattern color=red, }}]{Charlie}}
    }
    child{node[font = {\footnotesize},] {Bar\\[-0.3mm]Foo}
      child[grandchild,first] {node[font = {\footnotesize},]{Test 1}}
      child[grandchild,second] {node[font = {\footnotesize},]{Test 2}}
      child[grandchild,third] {node[font = {\footnotesize},preaction={clip, postaction={pattern=north west lines, pattern color=red, }}]{Test 3}}
    };
\end{tikzpicture}

\end{document}

O que produz:

Meu resultado desejado seria algo assim:

Answer 1

Você pode agrupar seu texto em uma caixa de cores branca:

\documentclass[border=0.1cm]{standalone}
\usepackage{graphicx} 

\usepackage{tikz}
\usetikzlibrary{patterns,trees}

\setlength{\fboxsep}{1.5pt}

\begin{document}

\begin{tikzpicture}[
  every node/.style={rectangle,draw,align=center, minimum height=0.5cm},
  grandchild/.style={grow=down,xshift=0.5em,anchor=west,
    edge from parent path={(\tikzparentnode.south) |- (\tikzchildnode.west)}},
  first/.style={level distance=7mm},
  second/.style={level distance=14mm},
  third/.style={level distance=21mm},
  level 1/.style={sibling distance=12em}]
    \node[font = {\small\bfseries}] {This is a very long root}
    [edge from parent fork down,level distance=10mm]
    child{node[font = {\footnotesize}, style={}] {Foo\\[-0.3mm]Bar}
    [edge from parent fork down,level distance=10mm]
      child[style={sibling distance=6em, level distance=10mm}] {node[font = {\footnotesize}, ]{Alpha}}
      child[style={sibling distance=6em, level distance=10mm}] {node[font = {\footnotesize}]{Beta}
      }
      child[style={sibling distance=6em, level distance=10mm,}] {node[inner sep=.3333em-\fboxsep,font = {\footnotesize},preaction={clip, postaction={pattern=north west lines, pattern color=red, }}]{\colorbox{white}{Charlie}}}
    }
    child{node[font = {\footnotesize},] {Bar\\[-0.3mm]Foo}
      child[grandchild,first] {node[font = {\footnotesize},]{Test 1}}
      child[grandchild,second] {node[font = {\footnotesize},]{Test 2}}
      child[grandchild,third] {node[inner sep=.3333em-\fboxsep,font = {\footnotesize},preaction={clip, postaction={pattern=north west lines, pattern color=red, }}]{\colorbox{white}{Test 3}}}
    };
\end{tikzpicture}

\end{document}