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The built-in scrollable components only respond to Up, Down, Right, and Left You already learned how to register an event handler for the Select button to be notified if a selected list box item is pressed Further, you can display a menu for your page if the Menu button is clicked; go to the previous menu page if the Back button is clicked; or use the Home button to go to your start screen This requires you to provide the buttons on your device surface and connect them to GPIO input pins It is up to you to map the GPIO input pins to the predefined button commands with your custom input provider That means, with the WPF, you install event handlers not for particular pins but for the buttons, such as ButtonMenu or ButtonUp.

Since it is legal to call Dispose multiple times on a single object, you must implement managed classes to support multiple destructor calls on a single object. This requirement does not exist for destructors of native classes. In the FileDumper sample shown previously, no special handling for this case is done. When Dispose is called a second time, it calls Dispose on its child objects again and relies on them to ignore this second Dispose call. If your destructor contains cleanup code, you have to ensure explicitly that cleanup is not done twice. The helper type DisposedFlag can be useful for this problem, too. The next block of code shows how a destructor for FileDumper could be implemented: FileDumper::~FileDumper() { if (disposedFlag) // already disposed return; // ignore this call /* do your cleanup here */ } The implementation discussed so far is not thread safe. If your class provides thread safety, you must also handle the case in which two threads call Dispose simultaneously. I will address this question in the context of reliable resource cleanup in 11. Even though the documentation does not explicitly disallow throwing exceptions other than System::ObjectDisposedException in IDisposable::Dispose, you should not throw exceptions in your destructor function. To understand this restriction, consider the following code: void f() { FileDumper fd("sample.txt"); DoSomething(); } When an exception is thrown in DoSomething, the FileDumper object will be disposed because it leaves scope before the exception is handled. If the destructor of FileDumper also throws an exception, the caller of f will see the last exception that was thrown, not the exception thrown in DoSomething, which is the one that actually caused the problem.

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Let s begin by taking a look at the code, shown in Listing 4-8. We have created a Controller named HomeController, to handle the dynamic home page of the application. The method to notice is handleRequestInternal(), where the real work is performed.

In order to get a notification when a button is clicked for your focused text flow element, you need to add the following lines: textFlowAddHandler(ButtonsButtonDownEvent, new ButtonEventHandler(textFlow_ButtonDown), false // handledEventsToo ); You can also add the handler to your main window instead of to a particular element, in order to get the events regardless of which child has the focus It is also possible to trigger to the ButtonUpEvent to be notified when a button is released In the previous code, there is a boolean parameter called handledEventsToo This flag indicates whether you want to get handled events too If this paramter is false, you will not get the Up, Down, Right, and Left events for a TextFlow element, because this element handles these events (it marks these events as handled even if it did not need to scroll).

Listing 4-8. HomeController public class HomeController extends AbstractController { private static final int FIVE_MINUTES = 5*60; private FlightService flights; public HomeController() { setSupportedMethods(new String[]{METHOD_GET}); setCacheSeconds(FIVE_MINUTES); } public void setFlightService(FlightService flightService) { this.flights = flightService; } @Override protected ModelAndView handleRequestInternal(HttpServletRequest req, HttpServletResponse res) throws Exception { ModelAndView mav = new ModelAndView("home"); mav.addObject("specials", flights.getSpecialDeals()); return mav; } } The constructor configures this Controller to respond only to HTTP GET requests, because GET has semantics that most closely match that of read. In the case of a read-only web page, such as the home page, this restriction prohibits potentially malicious clients from exploiting the system in unintended ways.

When the implicitly dereferenced syntax is used, the compiler automatically generates code for creating and disposing an instance. Such a strict coupling of variable declaration and object creation is not always desired. If you want to provide deterministic disposal for an object that is not instantiated by you, but passed to you by foreign code as a return value of a function or in any other way, the implicitly dereferenced syntax cannot be used. The following expression cannot be compiled: FileStream fs = *GetFile();

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