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In 3, you saw a simple plug-in factory. This factory worked, but with the side effect that any assembly that was loaded couldn t be unloaded. The plug-in factory was only capable of dealing with assemblies available on the local computer; it didn t have the capability to execute code on another computer. The simple plug-in factory could only deal with focused requirements. In general, the Factory pattern isn t capable of dealing with complexity, even though it should. Remember, though, that the intent of the Factory pattern is to remove references so that the interface can be separated from the implementation. To make the Factory pattern work in more complex scenarios, another pattern has to be used the Client-Dispatcher-Server pattern.2 This new pattern is similar to the Factory pattern, but can deal with location and resolution issues. The Client-Dispatcher-Server pattern addresses the resolution and location problems by introducing an intermediate that is responsible for establishing a connection between a client and a server. The intermediate is called the dispatcher. The pattern itself, like the Factory pattern, is relatively simple. Where the Client-Dispatcher-Server pattern differs from the Factory pattern is in the implementation. The Client-Dispatcher-Server pattern has more implementation details and is technologically specific, as it could involve network communications.

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.

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what is happening. The problem here is that you cannot rely on managed objects to remain in existence when called from the finalizer. On the other hand, it is safe to reference these objects from the destructor because when the destructor runs, the object and all its members are still fully intact. In this case, you should move the data connection close operation into the destructor, and be sure to call delete or use stack semantics to force the destructor call and the closure of the connection. The bottom line is that you can t ignore calling delete for classes that hold onto resources. If this seems disappointing, just remember that the managed environment may be very good at cleaning up memory, but it is not designed to provide the same automatic cleanup for other resources, which are best handled by matching every gcnew for a class with a destructor with a corresponding delete, or, better, using stack semantics.

GObject provides a property system, which allows you to customize how widgets interact with the user and how they are drawn on the screen. In this section, you will learn how to use styles, resource files and GObject s property system. Every class derived from the GObject class can install any number of properties. In GTK+, these properties store information about how the widget will act. For example, GtkButton has a property called relief that defines the relief style used by the button. In the following code, g_object_get() is used to retrieve the current value stored by the button s relief property. This function accepts a NULL-terminated list of properties and variables to store the returned value. g_object_get (button, "relief", &value, NULL); Each object can have many properties, so a full list will not be found in this book. For more information on properties available for a specific widget, you should reference the API documentation.

2. Frank Buschmann, et al., Pattern-Oriented Software Architecture, Volume 1: A System of Patterns (Indianapolis: Wiley Publishing, 1996), p. 323.

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