►Mr Lib: Extra GUI Libraries
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add-child
add-parent
get-children
get-parents
remove-child
remove-parent
set-parent-link-label
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graph-snip<%> : interface?

(send a-graph-snip add-child child) → void?
  child : (is-a?/c graph-snip<%>)
Adds a child of this snip. Instead of calling this method, consider using the add-links function.

(send a-graph-snip add-parent parent) → void?
  parent : (is-a?/c graph-snip<%>)
(send a-graph-snip add-parent parent    
  mouse-over-pen    
  mouse-off-pen    
  mouse-over-brush    
  mouse-off-brush) → void?
  parent : (is-a?/c graph-snip<%>)
  mouse-over-pen : (or/c false/c (is-a?/c pen%))
  mouse-off-pen : (or/c false/c (is-a?/c pen%))
  mouse-over-brush : (or/c false/c (is-a?/c brush%))
  mouse-off-brush : (or/c false/c (is-a?/c brush%))
Adds a parent of this snip. Instead of calling this method, consider using the add-links function.

(send a-graph-snip get-children) → (listof snip%)
returns a list of snips that implement graph-snip<%>. Each of these snips will have a line drawn from it, pointing at this snip.

(send a-graph-snip get-parents) → (listof graph-snip<%>)
Returns a list of snips that implement graph-snip<%>. Each of these snips will have a line drawn to it, starting from this snip.

(send a-graph-snip remove-child child) → void?
  child : (is-a?/c graph-snip<%>)
Removes a child snip from this snip. Be sure to remove this snip as a parent from the argument, too. Instead of calling this method, consider using the remove-links function.

(send a-graph-snip remove-parent parent) → void?
  parent : (is-a?/c graph-snip<%>)
Removes a parent snip from this snip. Be sure to remove this snip as a child from the argument, too. Instead of calling this method, consider using the remove-links function.

(send a-graph-snip set-parent-link-label parent    
  label) → void?
  parent : (is-a?/c graph-snip<%>)
  label : (or/c false/c string/)
Changes the label on the edge going to the parent to be label. Ignored if no such egde exists.

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