ParentEdgeLabelStyle

is an option for Tree and related functions that specifies what style should be used for edge labels.

Details

ParentEdgeLabelStyle allows specifying the label style of the parent edge of the root node of a tree, as well as that of any subtrees at positions matching a pattern.
Any style specification as used in Style can be used as a setting for ParentEdgeLabelStyle.
The following option settings can be used:

	Automatic	use the atomatic setting for style
	style	use style for the edge label
	{pos₁->style₁,pos₂->style₂,…}	use style_i for the edge label at relative position pos_i
	{patt₁style₁,patt₂style₂,…}	use style_i for the edges at positions matching the pattern patt_i

Subtrees with no explicit edge label style are taken to use the automatic style.
Color directives such as Red, as well as text specifications such as Bold or Small, can be given.
To specify multiple style directives, use Directive[style₁,style₂,…].
Giving the option setting ParentEdgeLabelStylestyle is effectively equivalent to replacing the label-like elements of a formatting or related construct by Style[label,style].
Edge label specifications are effectively applied in the order ParentEdgeLabel, ParentEdgeLabelStyle and ParentEdgeLabelFunction, with later specifications overriding earlier ones.
In ParentEdgeLabelStyle, Allstyle uses style for all subtrees.
In ParentEdgeLabelStyle, TreeCases[pattern]style uses style for all subtrees with data matching pattern.

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Style an individual edge label:

Style all edge labels:

Use the same style for all edge labels:

Specify positions using position patterns:

Specify positions using data patterns:

Styles for edge labels can be specified by position:

Styles specified by a subtree take precedence over styles specified by its ancestors:

A position {i,j,…} in a subtree refers to its subtree at relative position {i,j,…}:

A relative position {2} at position {1} refers to the global position {1,2}:

In general, a pattern patt applies to subtrees at global position {i,j,…} that match patt:

A list of patterns {patt₁,patt₂,…} applies to relative positions {i,j,…} that match the patt_i:

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