birt qr code PARTITIONING in Objective-C

Produce Data Matrix in Objective-C PARTITIONING

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Silverlight 2 saw the addition of something called the Visual State Manager (VSM) that allows you to easily add States to any UIElement such as a Button, Rectangle, Ellipse, or even an entire UserControl. You can, of course, do this in code-behind, but it would be very tedious. For that reason Microsoft introduced the States panel. The States panel allows you to very easily and very quickly create States. Then all you need to do is wire up those States using Behaviors to trigger them in XAML with no codebehind whatsoever. In this chapter I first show you how to use VSM to create States for a simple Button and wire up those States using Behaviors. I then show you how to take what you have learned and create a very highly styled Silverlight Media Player that makes use of VSM to show and hide the navigation buttons (Play, Pause, Stop). If you are like me and have absolutely no patience, you can navigate the following URL and see what the final Silverlight Media Player product will look like in action:

The use cases provide for the idea that a user could start by identifying a resource rather than a project. In this case, the user can still associate a project with the resource by selecting a project. This implies that the Resource object has a collection of projects to which the resource is assigned. The object model thus far represents this collection as ResourceAssignments. Let s consider the behaviors and information for the ResourceAssignments collection and the items it would contain. In this case, the user starts with a Resource and wishes to assign the resource to a project. So the ResourceAssignments object will have a couple of behaviors: listing the projects to which the resource is assigned, and assigning the resource to a new project. This can probably be handled by an AssignTo() method that accepts the Id property of a Project. The items in ResourceAssignments have the behavior of returning information about the project assigned to the resource. The information of value to a user is likely the following: Project ID Project name Date assigned to the project Role of the resource on the project Figure 6-4 shows the potential ResourceAssignments object and what its items might look like.

As I noted at the beginning of the chapter, one of my key goals is to design this framework to provide powerful features while following the key object-oriented concepts, including encapsulation. Encapsulation is the idea that all of the logic and data pertaining to a given business entity is held within the object that represents that entity. Of course, there are various ways in which one can interpret the idea of encapsulation nothing is ever simple. One approach is to encapsulate business data and logic in the business object and then encapsulate data access and ORM behavior in some other object: a persistence object. This provides a nice separation between the business logic and data access and encapsulates both types of behavior, as shown in Figure 2-7.

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Note From a security prospective, the includeExceptionDetailInFaults="true" WCF configuration should