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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.

As discussed in the previous chapter, layout controls (or layout elements as they are sometimes called) are a very important part of Silverlight, allowing you to arrange your content in your applications. Here I go over the most popular ones and the properties that make them unique. Then I over some new controls that have been added in Silverlight 4.

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Setting a new value for a property is easily done with g_object_set(). In this example, the relief property of the button was set to GTK_RELIEF_NORMAL: g_object_set (button, "relief", GTK_RELIEF_NORMAL, NULL); Functions are provided to set and retrieve many of the properties of each widget. However, not every property has that option. These functions will become extremely important when you learn about the GtkTreeView widget in 8, because many objects used in that chapter do not provide get or set functions for any properties. It is also possible to monitor a specific property with GObject s notify signal. You can monitor a property by connecting to the notify::property-name signal. The example in Listing 2-4 calls property_changed() when the relief property is changed. Listing 2-4. Using the Notify Property g_signal_connect (G_OBJECT (button), "notify::relief", G_CALLBACK (property_changed), NULL); ... static void property_changed (GObject *button, GParamSpec *property, gpointer data) { /* Handle the property change ... */ }

any scripts require a minimum set of input parameters or defined variables in order to run correctly. For example, they may contain customizable values used for configuration purposes, which are initially set to default values. In this chapter we ll look at various methods of testing variables and setting default values. The differences between many of these syntactical variants are subtle, but each is useful for working with undefined variables, setting variable defaults, and debugging. All of the methods in this chapter check the state of a given variable and assign or substitute a value based on that assessment. The point here is to provide a variety of ways to perform these types of tasks. Whereas some are simple and will be used often, others are more specific and will be used only in specific situations. For example, assume that you ve written a script to change a machine s network name. At the very least, the script s input parameters would probably include the old and new machine names, the machine s IP address, and perhaps the machine s domain or subnet mask. While you may want the subnet mask and domain name to be set from the command line, these values likely won t be changing often and you ll simply want to set default values for your local site and not have to worry about passing additional parameters. The techniques in this chapter will give you the tools to easily set default values when a variable has a null value or is otherwise undefined.

Caution While it is acceptable to use either a dash or an underscore when typing signal names, you must always use dashes when using the notify signal. For example, if you need to monitor GtkWidget s can-focus property, notify::can_focus is not acceptable! Remember that notify is the signal name, and can-focus is the name of the widget property.

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