add TreeScope enum class

Constant Classes/TreeScope.ahk

@@ -0,0 +1,56 @@
+/*
+class: TreeScope
+an enumeration class containing values that specify the scope of various operations in the Microsoft UI Automation tree.
+
+Authors:
+	- maul.esel (https://github.com/maul-esel)
+
+License:
+	- *LGPL* (http://www.gnu.org/licenses/lpgl-2.1.txt)
+
+Documentation:
+	- *class documentation* (http://maul-esel.github.com/COM-Classes/master/TreeScope)
+	- *msdn* (http://msdn.microsoft.com/en-us/library/windows/desktop/ee671699)
+
+Requirements:
+	AutoHotkey - AHK v2 alpha
+	OS - Windows XP / Windows Server 2003 or higher
+*/
+class TreeScope
+{
+	/*
+	Field: Element
+	The scope includes the element itself.
+	*/
+	static Element := 0x1
+
+	/*
+	Field: Children
+	The scope includes children of the element.
+	*/
+	static Children := 0x2
+
+	/*
+	Field: Descendants
+	The scope includes children and more distant descendants of the element.
+	*/
+	static Descendants := 0x4
+
+	/*
+	Field: Parent
+	The scope includes the parent of the element.
+	*/
+	static Parent := 0x8
+
+	/*
+	Field: Ancestors
+	The scope includes the parent and more distant ancestors of the element.
+	*/
+	static Ancestors := 0x10
+
+	/*
+	Field: Subtree
+	The scope includes the element and all its descendants. This flag is a combination of the <Element>, <Children> and <Descendants> values.
+	*/
+	static Subtree := (TreeScope.Element | TreeScope.Children) | TreeScope.Descendants
+}