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The MVC framework ships with several value providers out of the box, bundled together in the ValueProviderFactories class, shown in listing 14.9.

This exercise is very similar to Exercise 2-1, except you need to use the functions provided by the GObject library for changing properties. For example, in the main() function, the title, width, height, and resizability of the GtkWindow widget should be set with g_object_set(). In addition, within the key-press-event callback function, you should use g_object_get() and g_object_set() to interact with the title property of the GtkWindow and the label property of the GtkLabel. You are also instructed to provide notification when the window s title property is changed. Connecting the window to the notify::title signal, which will monitor the value of the given property, can do this. Then, g_message() will output the new window title to standard output. You should see the message in the terminal output if you launch your application from a terminal emulator.

public static class ValueProviderFactories { private new new new new new }; static readonly ValueProviderFactoryCollection _factories = ValueProviderFactoryCollection() { FormValueProviderFactory(), RouteDataValueProviderFactory(), QueryStringValueProviderFactory(), HttpFileCollectionValueProviderFactory()

To examine security issues related to cross-domain security, you first have to understand how pages from different domains may interact in the browser, and what mechanisms exist in browsers to limit such interactions.

This exercise helps you gain experience using a variety of container widgets that were covered in 3, including GtkNotebook, GtkVBox, and GtkHBox. Let us analyze the content of each of these containers one at a time. The GtkNotebook container should contain four tabs. Each tab in a notebook is associated with a label widget and a child widget. The gtk_notebook_append_page() function can be used to add new pages to a notebook. Each of these tabs should contain a GtkButton widget that is connected to the clicked signal. When a button is clicked, the notebook should move to the next page, wrapping around when the last page is reached. Connecting each clicked signal to the same callback function can do this. Within the callback function, which is called next_tab() in the downloadable solution, you first need to check the page number. If the page number is less than three, you can simply call gtk_notebook_next_page() to move to the next page. Otherwise, you can use gtk_notebook_ set_page() to set the page number to zero. This same method can be used for moving to the previous page in the notebook. The next container is a GtkHBox that holds two buttons. The first button should move to the previous page in the GtkNotebook container when pressed. As previously stated, you can use the same method that was used for moving to the next page for moving to the previous page, although it will have to be reversed. The other button should close the window and exit the application when clicked. These buttons can be packed with gtk_box_pack_end() so that they appear against the right side of the horizontal box instead of the left side.

public static ValueProviderFactoryCollection Factories { get { return _factories; } } }

The last container in the application is a GtkVBox widget that should hold the GtkNotebook and GtkHBox widgets. This vertical box can be packed into the top-level GtkWindow widget to complete the application s user interface.

We can see from listing 14.9 that the initial value providers include implementations that support binding from form values, route values, the query string, and the files collection. But we d like to add a new value provider to bind values from Session. To add a new value provider, we simply need to add our custom value provider factory to the ValueProviderFactories.Factories collection, usually at application startup, where we d also configure areas, routes, and so on, as shown in listing 14.10.