The Structure of the TreeMenuApplet

The tree structure in TreeMenuApplet is built in a completely recursive manner. Each mode of the tree is composed of two objects, a Tree object, and a TreeNode object.

The TreeNode object is the visual representation of the node, comprising the icon, the node label, and the widget to the left of the node that allows expantion and contraction of the node.

The Tree object comprises the structure of the tree. Each Tree contains one TreeNode (it's root node) and any number of Tree nodes comprising it's children. It also has a reference to a parent tree (null if there is no parent). Any operations that have to traverse the tree do so recursively both upward and downward from the current node.