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com/yahoo/astra/fl/controls/treeClasses/RootNode.as

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+/*
+Copyright (c) 2009 Yahoo! Inc.  All rights reserved.  
+The copyrights embodied in the content of this file are licensed under the BSD (revised) open source license
+*/
+package com.yahoo.astra.fl.controls.treeClasses {
+//--------------------------------------
+//  Class description
+//--------------------------------------
+
+/**
+ *  The RootNode is a special case of a BranchNode that's used
+ *  to contain the top-level nodes. The RootNode itself is never drawn.
+ *
+ *  @author Allen Rabinovich
+ *
+ *  @see com.yahoo.astra.fl.controls.treeClasses.TreeDataProvider
+ *  @see com.yahoo.astra.fl.controls.treeClasses.TNode
+ *  @see com.yahoo.astra.fl.controls.treeClasses.LeafNode
+ *  @see com.yahoo.astra.fl.controls.treeClasses.BranchNode
+ */
+	public dynamic class RootNode extends BranchNode {
+    /**
+     *  Constructor.
+     *
+	 * @param pDP The data provider that will contain this node.
+	 */
+		public function RootNode (pDP:TreeDataProvider) {
+			_nodeLevel = -1;
+			_nodeType = TreeDataProvider.ROOT_NODE;
+			_nodeState = TreeDataProvider.OPEN_NODE;
+			super(pDP);
+			
+		}
+	/**
+	 * @private (setter);
+	 */
+		override public function set nodeLevel (value:int) : void {
+			
+		}
+		
+	/**
+	 * Since the root node itself is not visible, this function
+	 * draws all of the top-level nodes.
+	 *
+	 */
+		override public function drawNode () : void {
+			for each (var child:TNode in _children) {
+				child.drawNode();
+			}
+		}
+
+	/**
+	 * @private
+	 *
+	 */
+		override public function hideNode () : void {
+		}
+		
+	/**
+	 * Adds a child node at a particular index in the array
+	 * of children of the current node. If the current node is
+	 * open, the new child node is also made visible.
+	 *
+	 * @param childNode The node to be added as a child
+	 * @param index The position in the <code>children</code> array where
+	 * the child node is inserted.
+	 *
+	 */
+		override public function addChildNodeAt (childNode:TNode, index:int) : void {
+				_children.splice(index, 0, childNode);
+				childNode.parentNode = this as BranchNode;
+				childNode.nodeLevel = this.nodeLevel + 1;
+				childNode.drawNode();
+		}
+
+	}
+}