Grenzmuster innerhalb des Tikz-Knotens

Question

Ich möchte in Tikz einen Baum erstellen, in dem ich bestimmte Knoten mithilfe eines Musters hervorhebe. Allerdings möchte ich das Muster innerhalb der Rechtecke so beschränken, dass der Text auf einem weißen Hintergrund sichtbar ist.

Hier ist das 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}

Das Ergebnis:

Mein gewünschtes Ergebnis wäre ungefähr das hier:

Answer 1

Sie könnten Ihren Text in eine weiße Farbbox einschließen:

\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}