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Most of GUI programming is devoted to handling events through callbacks from the graphical interface. Events are described in 8. To display a message box containing the "Hello, World!" string, you have to configure the button so that when its Click event is fired, a function is called. In the example, you pass a function to the Add method for the button s Click event, which adds an event handler to an event source. You then add the button to the form and call the form s Show method to display it. Note that this code should be executed using fsi.exe. It won t run as a stand-alone application unless you add the following line at the end: Application.Run(form) This line relates to the event loop of a GUI application, and it s required to handle events such as button clicks. Moreover, if you execute the compiled program, notice that the window uses the classic Windows look and feel rather than the more fashionable look and feels featured by recent versions of Windows. This can be easily addressed by adding the following call to the EnableVisualStyles static method, right after the open statement: Application.EnableVisualStyles() If you use fsi.exe, both visual styles and the event loop are handled by F# Interactive.

Most Android phones ship with Google Maps. It s optional and not part of the core Android apps from the Android SDK, but I ve yet to see a phone that didn t include it. If you happen to have such a phone, it s a free download from http://m.google.com. Google Maps works with your phone s GPS, and if you have location sensing enabled on your phone, Google Maps will determine your location when you launch the app. You can also use it to search for distant locations. You can move your view of the map with your fingers, and in Android 2.1 and above, you can also use pinch-to-zoom motions to enlarge and shrink the area you re displaying. Android 2.0 and earlier users will have to use the zoom + and buttons at the bottom of the screen, just as with a web browser. Click anywhere on the map, and Google will attempt to tell you the address of that location. Press the Menu button to see your options, as shown in Figure 12 1. Remember that, if you re ever lost, you can use the My Location tool. You ll see yourself as a point on the map with a light-blue circle around it. Because there are a lot of variables that affect accuracy, the larger circle shows where you could be. The smaller the circle, the more accurate the prediction.

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#!/bin/bash PATH="/bin:/usr/bin" ## basic shell wrapper to provide sandboxed rights control. ## requires userShell.sb and shell.sb sandbox profiles to ## be installed at /usr/share/sandbox/ declare x myShell=/bin/bash if [ -x "${myShell: }" ]; then if [ -f /usr/share/sandbox/shell.sb ]; then sandbox-exec -n shell "$myShell" "$@" else echo "Sandbox profile not found, cannot continue!" exit 2 fi else echo "Illegal shell: $myShell, cannot continue!" exit 2 fi

Graphical applications are built on the abstractions provided by the graphical environment hosting them The application must interact with its environment and process input in an unstructured way User input isn t the only kind of input received from a windowing system Window management often involves requests to or from the application itself, such as painting or erasing a form Windowing systems provide a common and abstract way to interact with a graphical application: the notion of an event When an event occurs, the application receives a message in the message queue with information about the event The graphical application is responsible for delivering messages from the message queue to the control for which they re meant A set of functions provided by the API of the windowing system supports this.

With this simple shell script installed at /usr/local/bin/sbshell, the next step is to ensure that it is executable with the command chmod:

This activity of reading messages from the message queue and dispatching them is known as the event loop of the application If the loop fails for any reason, the GUI components cease to work, the application hangs, and Windows may eventually inform you that the application isn t responding It s rare for an application to program the event loop explicitly Programming toolkits encapsulate this functionality because it s basically always the same The Run method of the Application class is responsible for handling the event loop, and it ensures that messages related to events are delivered to targets within the application GUI programs often involve multiple threads of execution 13 discusses threading and concurrency in more detail; for this chapter, it s important to remember that event dispatching is a single-threaded activity, even if it may seem the opposite.

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