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It is then up to the child to interact with its parent collection to be removed from the collection itself For this to happen, the child object needs a reference to its parent collection This is expressed through a protected property named Parent, which is discussed later in the chapter, in the Root, Parent, and Child Behaviors section A flag is used to ignore multiple calls to the IEditableObject methods: [NotUndoable()] private bool _bindingEdit; private bool _neverCommitted = true; Notice that _bindingEdit is declared with the [NotUndoable()] attribute This field controls interaction with the UI, not internal object state; and because of this, there s no reason to make it part of the object s snapshot data, as that would just waste memory A second flag is also declared and is used to track whether ApplyEdit() has been called on the object.

This value was set to false in the ApplyEdit() implemented earlier, and will be used to control whether a child object should remove itself from its parent collection The three interface methods are implemented as follows: void SystemComponentModelIEditableObjectBeginEdit() { if (!_bindingEdit) BeginEdit(); } void SystemComponentModelIEditableObjectCancelEdit() { if (_bindingEdit) { CancelEdit(); if (IsNew && _neverCommitted && EditLevel <= EditLevelAdded) { if (Parent != null) ParentRemoveChild(this); } } } void SystemComponentModelIEditableObjectEndEdit() { if (_bindingEdit) ApplyEdit(); } Notice that the methods are declared using syntax to explicitly implement the IEditableObject interface This is required because BeginEdit() and CancelEdit() are already public methods in the class, and this avoids any naming conflict All three methods call the corresponding edit methods implemented earlier.

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In the previous section, you saw examples of accumulating traversals of a syntax representation. It is common to traverse abstract syntax in other ways: Leaf rewriting (mapping): Translating some leaf nodes of the representation but leaving the overall shape of the tree unchanged. Bottom-up rewriting: Traversing a tree but making local transformations on the way up. Top-down rewriting: Traversing a tree but before traversing each subtree, attempting to locally rewrite the tree according to some particular set of rules. Accumulating and rewriting transformations: For example, transforming the tree left to right but accumulating a parameter along the way. For example, the following mapping transformation rewrites all leaf ellipses to rectangles: let rec rectanglesOnly scene = match scene with | Composite(scenes) -> Composite(scenes.Map(rectanglesOnly)) | Ellipse(rect) | Rect(rect) -> Rect(rect) Often whole classes of transformations are abstracted into aggregate transformation operations taking functions as parameters. For example, here is a function that applies one function to each leaf rectangle: let rec mapRects f scene = match scene with | Composite(scenes) -> Composite(scenes.Map(mapRects f)) | Ellipse(rect) -> Ellipse(f rect) | Rect(rect) -> Rect(f rect)

Note You can download the completed functions from this book s page from the friends of ED website, http://www.friendsofed.com/.

The _bindingEdit field is used to determine whether the BeginEdit() method has been called already so any subsequent method calls can be ignored The _bindingEdit field is set to true when an edit process is started and to false when either CancelEdit() or ApplyEdit() is called The _neverCommitted field tracks whether the ApplyEdit() method has ever been called If it hasn t ever been called, and data binding attempts to cancel the edit operation, this flag is used to control whether the object should remove itself from its parent collection The _neverCommitted field starts out true and is set to false if ApplyEdit() is called With this mechanism in place, the implementation of IEditableObjectBeginEdit() calls only the real BeginEdit() method if no edit session is currently underway With the implementation of.

The types of these functions are as follows: val rectanglesOnly : Scene -> Scene val mapRects: (RectangleF -> RectangleF) -> Scene -> Scene Here is a use of the mapRects function to adjust the aspect ratio of all the RectangleF values in the scene (RectangleF values support an Inflate method): let adjustAspectRatio scene = mapRects (fun r -> RectangleF.Inflate(r,1.1f,1.0f/1.1f)) scene

the n-level undo methods and System.ComponentModel.IEditableObject, business objects now provide full control over editing and undo capabilities, both to the UI developer and to Windows Forms data binding.

Sometimes it is feasible to delay the loading or processing of some portions of an abstract syntax tree. For example, imagine if the XML for the small geometric language from the previous section included a construct such as the following, where the File nodes represent entire subtrees defined in external files: <Composite> <File file='spots.xml'/> <File file='dots.xml'/> </Composite> It may be useful to delay the loading of these files. One general way to do this is to add a Delay node to the Scene type: type Scene = | Ellipse | Rect | Composite | Delay

2 introduced the idea that a business object can be a root, parent, and/or child object. A definition of each can be found in Table 3-7. Table 3-7. Root, Parent, and Child Definitions

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