The GtkCTree widget is used for showing a hierarchical tree to the
user, for example a directory tree.
The tree is internally represented as a set of GtkCTreeNode
structures.
The interface has much in common with the GtkCList widget: rows
(nodes) can be selected by the user etc.
Positions in the tree are often indicated by two arguments, a
parent and a sibling, both GtkCTreeNode pointers. If the parent is
NULL, the position is at the root of the tree and if the sibling is
NULL, it will be the last child of parent, otherwise it will be
inserted just before the sibling.
Signals:
change_focus_row_expansion
Changed when the focused row is either expanded or collapsed
tree_collapse
Called when a node is collapsed
tree_expand
Called when a node is expanded
tree_move
Called when a node is moved (using DND, as an example)
tree_select_row
Called when a node is selected.
tree_unselect_row
Called when a node is unselected.
GTK.Container()->set_resize_mode()