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Tab controls are used to compact a large amount of data into a single form by segmenting the data into different screens, or tab pages. One of the more well-known examples of this construct is the Properties window associated with files and directories in the Windows file system. Right-click on a directory and select the Properties item, and you will see a window similar to figure 11.1. This figure shows the properties for the MyAlbumEditor directory containing the project we began in chapter 10. There are three tab pages available to display different types of directory properties: General, Web Sharing, and Sharing. The exact tabs displayed on your system may differ depending on which version of Windows you are running and the specific features installed and enabled.

Part I:

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Notice that the addition of GetPrevious( ) required a change to the implementations of the methods defined by ISeries However, since the interface to those methods stays the same, the change is seamless and does not break preexisting code This is one of the advantages of interfaces As explained, any number of classes can implement an interface For example, here is a class called Primes that generates a series of prime numbers Notice that its implementation of ISeries is fundamentally different than the one provided by ByTwos

Figure 11.1 Users switch to a different tab page by clicking on the desired tab, or using the keyboard shortcut Ctrl+Tab.

// Use ISeries to implement a series of prime numbers class Primes : ISeries { int start; int val; public Primes() { start = 2; val = 2; } public int GetNext() { int i, j; bool isprime; val++; for(i = val; i < 1000000; i++) { isprime = true; for(j = 2; j <= i/j; j++) { if((i%j)==0) { isprime = false; break; } }

You can create windows similar to figure 11.1 using the Windows Forms classes TabControl and TabPage. The TabControl class is a container for one or more TabPage objects, with each TabPage instance holding the tab information and set of controls to display for a specific page. Since I haven't shown you a class diagram for a few chapters, take a look at figure 11.2 showing the class hierarchy for the tab and tab page controls. It is also worth noting that the complete class hierarchy of all Windows Forms controls is shown in appendix C. As shown in figure 11.2, the TabControl class inherits directly from the Control class we discussed in chapter 3. We will look at the members of this class in a moment. The TabPage class, on the other hand, inherits from the Panel class. This makes sense, since each page in a tab control contains a collection of controls, exactly 354

Part I:

if(isprime) { val = i; break; } } return val; } public void Reset() { val = start; } public void SetStart(int x) { start = x; val = start; } }

like a Panel object. This also permits tab pages to automatically scroll if the display area exceeds the size of the window by using members of the ScrollableControl class. We saw how to enable this type of scrolling for Form and Panel objects in chapter 7.