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contains that, and eventually the single application object that contains all of the windows. When the user selects the Paste command from the menu, Cocoa examines the objects in the chain to find the first one that implements a -paste: method. Similarly, the menu item itself is enabled and disabled automatically, based on the presence or absence of an object in the responder chain that implements paste:. This arrangement does not require any object to look for a Paste command event or register itself with the menu item. The Paste command comes to life simply because an object implemented a paste: method. But, you might ask, what if the Paste command needs to be enabled conditionally That s simple: your custom view object should implement the -validateMenuItem: method. Objects in the responder chain that implement that method are queried to determine what commands should be enabled for the user. Otherwise, the Cocoa framework makes up its own mind. The emphasis here is not on what an object is but what it does. The capabilities or roles of an object are determined by examining what methods it implements, rather than what class it is or requiring it to register itself with other objects. This philosophy has its roots in aspect-oriented programming. Objective-C developers call these methods informal protocols. The end result is a fluid application that adjusts itself and responds to users based largely on what functions the objects in the program do, or don t do. The knowledge required by one object about another is minimal, as are its relationships to other view objects. In Objective-C, object implementations are simpler, more encapsulated, make fewer assumptions, and are generally more reusable.

Asking for permission is pretty straightforward. Right-click the project, select properties, and then switch to the Security tab. You ll see something like figure 17.5. When this page is first displayed, it shows the default security rights that we ll have. Here we can specify exactly what rights we want. In fact, via the very handy Calculate Permissions button, we can have Visual Studio run through the application and figure it out for us. Unfortunately, when we run Calculate Permissions on this application, it comes up saying that we need Full Trust, which means that users have to give us godlike rights to their systems in order to look up words in a dictionary!

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The wins you get by understanding and applying design patterns in your daily work include simplicity of design, software based on solid and proven designs, and a good step toward maximizing reusability. As much of the Apple documentation on Cocoa points out, design patterns play an important role in the design of the Cocoa frameworks, as well as Cocoa programs. In Cocoa, four primary design patterns emerge: Model-View-Controller (MVC), Target/Action, Delegation, and Chain of Responsibility. Let s look briefly at these patterns and see how they apply to Cocoa. Model-View-Controller (MVC) pattern The MVC pattern can be traced back to the days of designing interfaces in Smalltalk. Strictly speaking, the MVC pattern comprises three groups of classes, sometimes called the MVC triad:

We could refactor the test classes and create a base test class that contains the setup method. The full code for the test classes is shown in listing 6.2.

It s important to note that for SELECT statements like SELECT SUM(number) FROM GroceryItem, the column name will actually be SUM(number). This also picks up on SQL aliases. Similarly, you iterate over the columns to get the types:

Figure 5 12. Assign the 320_480_Stair.png file to the Image field at the top of the Image View Attributes frame.

When you enable this visualization, Silverlight will display redraw regions in a different color for each frame, making it obvious what elements are causing which parts of the interface to be redrawn at runtime. Just as with the other setting, this isn t something you want to leave enabled in production. Also with the other settings, this has a runtime-settable version especially useful for out-of-browser applications:

The C standard provides a pair of constants that really come in handy when dealing with our next set of operators. The constant true has a value of 1, while the constant false has a value of 0. Both of these constants are defined in the include file <stdbool.h>. You can use these constants in your programs to make them a little easier to read. Read on, and you ll see why.

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