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The idea that a collection can be a root object or a child object is particularly important. It s fairly obvious that a collection can be a child object an Invoice root object will have a LineItems collection that contains LineItem objects, so the LineItems collection is itself a child object. However, collection objects can also be root objects. An application may have a root object called Categories, which contains a list of Category objects. It s quite possible that there s no root object to act as a parent for Categories it may simply be an editable list of objects. To support this concept, BusinessListBase, like BusinessBase itself, must support these two modes of operation. In root mode, some operations are legal while others are not; in child mode, the reverse is true. As in BusinessBase, the collection object needs to know whether it s a root or a child object: [NotUndoable()] private bool _isChild = false; protected bool IsChild { get { return _isChild; } } protected void MarkAsChild() { _isChild = true; } This functionality is the same in BusinessBase, and it allows the business developer to mark the object as a child object when it s first created. The IsChild property will be used in the rest of BusinessListBase to adjust the behavior of the object (such as exercising control over deletion) accordingly.

Event handling can be performed by both subscribing delegates and overriding methods. The former approach is more typical of applications; the latter is more common in control development. Method overriding guarantees more control on the event handling because it allows a complete redefinition of the inherited behavior, whereas with delegation it is possible to only add behavior. When an overridden method starts with a call to the method to be overridden in the base class, then it is functionally equivalent to use delegation rather than method overriding. It is traditional, however, to use method overriding in the case of control development to have a uniform notation for event handling. It is important to be careful during method overriding since if the call to the overridden method is omitted, the corresponding delegate event is not fired because delegate events are invoked by the event handlers of the base classes.

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What this chapter covers: Statements Variables and arrays Operators Conditional statements and looping statements Functions and objects

As with a regular business object, a collection needs to support n-level undo. The functionality in BusinessListBase must integrate with UndoableBase. This means that BusinessListBase must implement the Csla.Core.IEditableCollection interface, which inherits from Csla.Core.IUndoableObject. Implementing the interface requires that the class implement CopyState(), UndoChanges(), and AcceptChanges() methods that store and restore the collection s state as appropriate. Because a collection can also be a root object, it needs public methods named BeginEdit(), CancelEdit(), and ApplyEdit(), like BusinessBase. In either scenario, the process of taking a snapshot of the collection s state is really a matter of having all the child objects take a snapshot of their individual states. The undo operation for a collection is where things start to get more complicated. Undoing all the child objects isn t too hard, since the collection can cascade the request to each child object. At the collection level, however, an undo means restoring any objects that were deleted and removing any objects that were added, so the collection s list of objects ends up the same as it was in the first place. There s a fair amount of code in BusinessListBase just to deal with deletion of child objects in order to support n-level undo. As with the rest of the framework, if n-level undo isn t used, then no overhead is incurred by these features.

Let s take a look at how you handle the mouse move events and the use of the mouse wheel. When the wheel of the mouse is scrolled, the control adjusts the scale factor to zoom in or out of the current view. To show how this method works, we must discuss how you decide which portion of the data is made available through the view of the control. You use two fields called initView and visibleSamples. Since you cannot assume that all the samples fit in the display of the control, the former indicates the time (in the time scale of the samples) corresponding to the leftmost visible value, and the latter indicates the number of time units in the unit scale of samples that should be visible. Zooming is performed by changing the density of time units to be displayed inside the viewport. The last method of Listing 11-3 is GetTime, and it is used to convert the time unit of samples in microseconds using a scale factor that is one of the configuration properties made available by the control.

The hardest part of implementing n-level undo functionality is that not only can child objects be added or deleted, but they can also be undeleted or unadded in the case of an undo operation.

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