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In 1984, Jim Gettys and Bob Scheifler created the X Window System (X11) at Massachusetts Institute of Technology as a platform-independent display environment for debugging the Argus system. Currently developed by The X.Org Foundation, X11 is the standard display manager on Linux and other UNIX-like operating systems. In the most basic terms, X11 provides windowing functionality for bitmap displays. While the X Window System is used on Linux, many other operating systems such as Microsoft Windows do not use it. Therefore, another advantage of GTK+ is that it masks the need to interact with the underlying rendering system, regardless of what it is. Your code will look the same whether you are writing it for Linux, Windows, or Mac OS X.

In this chapter, you learned about C# and the .NET Framework. I went over some advantages of using C# and delved into the basics of classes and OOP and some advantages of both. I also covered the basics of XAML what it is, what it can do and talked about some powerful features such as data binding. Finally, I took you through a hands-on tutorial on how to do some basic tasks in OOP. In the next chapter, I talk about the layout controls that allow you to place content into your Silverlight applications.

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Listing 2-3. The GtkButton Widget (buttons.c) #include <gtk/gtk.h> static void destroy (GtkWidget*, gpointer); int main (int argc, char *argv[]) { GtkWidget *window, *button; gtk_init (&argc, &argv); window = gtk_window_new (GTK_WINDOW_TOPLEVEL); gtk_window_set_title (GTK_WINDOW (window), "Buttons"); gtk_container_set_border_width (GTK_CONTAINER (window), 25); gtk_widget_set_size_request (window, 200, 100); g_signal_connect (G_OBJECT (window), "destroy", G_CALLBACK (destroy), NULL); /* Create a new button that has a mnemonic key of Alt+C. */ button = gtk_button_new_with_mnemonic ("_Close"); gtk_button_set_relief (GTK_BUTTON (button), GTK_RELIEF_NONE); /* Connect the button to the clicked signal. The callback function recieves the * window followed by the button because the arguments are swapped. */ g_signal_connect_swapped (G_OBJECT (button), "clicked", G_CALLBACK (gtk_widget_destroy), (gpointer) window); gtk_container_add (GTK_CONTAINER (window), button); gtk_widget_show_all (window); gtk_main (); return 0; } /* Stop the GTK+ main loop function. */ static void destroy (GtkWidget *window, gpointer data) { gtk_main_quit (); } In Listing 2-3, gtk_widget_destroy() is called on the main window when the button is clicked. This is a very simple example, but it has a practical use in most applications.

The -f switch is different from the rest Note that it has a colon (:) following the f in the getopts switch list If a switch is followed by a colon, an argument should follow the switch when it is used In our example, the -f switch lists the contents of a file and requires the filename to follow The case branch for -f sets the FILE variable to $OPTARG This is another special environment variable that is set by getopts to assign the argument that is passed to the switch If the file exists, it will be displayed; if not, the code will generate an error message The last two switches cause the usage statement to be displayed A more advanced example of the getopts construct can be found in 17 Additionally, I have included another script in the download package for this chapter (at wwwapress.

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The GNOME Human Interface Guidelines, which can be viewed or downloaded at http://developer.gnome.org/projects/gup/hig, state that preferences dialogs should apply settings immediately after a setting is changed. Therefore, if you create a preferences dialog, there is a good chance that you will only need one button. The purpose of the button would be to destroy the window that contains the button and save the changes. After creating the button, gtk_button_set_relief() can be used to add a certain magnitude of relief around the GtkButton. Relief is a type of 3-D border that distinguishes the button from surrounding widgets. Values of the GtkReliefStyle enumeration follow: GTK_RELIEF_NORMAL: Add relief around all edges of the button. GTK_RELIEF_HALF: Add relief around only half of the button. GTK_RELIEF_NONE: Add no relief around the button. Listing 2-3 introduces g_signal_connect_swapped(), a new signal connection function. This function swaps the position of the object on which the signal is being emitted and the data parameter when running the callback function. g_signal_connect_swapped (G_OBJECT (button), "clicked", G_CALLBACK (gtk_widget_destroy), (gpointer) window); This allows you to use gtk_widget_destroy() on the callback function, which will call gtk_widget_destroy (window). If the callback function only receives one parameter, the object will be ignored.

com) that performs some basic administrative tasks, including turning on and off the set -x value..

Layout Controls: Including the New Silverlight 4 Controls: Viewbox, RichTextBox, FlowDirection Property, and Improved Data Binding

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