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Note For the rest of the book, code listings will only include portions of text significant to the section. Therefore, you will need to download the source code to view the full examples. For example, the destroy callback function will not be included in any further examples, because you should know how to use it by this point. It will, however, be included in the source code downloadable from www.gtkbook.com.

The markup in listing 2.4 renders our table. Instead of relying on magic string keys and complex logic, we re free to work directly with a strong, clear model. By constructing the model elsewhere and designing it to represent the screen, we ve made the developer s job easy. Some screens are more complex than a single table. They may feature multiple tables and additional fields of other data: images, headings, subtotals, graphs, charts, and a million other things that complicate a view. The presentation model solution scales to handle them all. Developers can confidently maintain even the gnarliest screens as long as the presentation model is designed well. If a screen does contain multiple complex elements, a presentation model can be a wrapper, composing them all and relieving the markup file of much complexity. A good presentation model doesn t hide this complexity it represents it accurately and as simply as possible, and it separates the data on a screen from the display. Another complex, real thing that a web application must process is user input. We ll look at modeling user input next.

Once the form POST has been received by the application and the credentials validated, the application issues a session token to the browser in an HTTP cookie The browser automatically returns the cookie with each subsequent request to the server, which allows the application to associate subsequent requests with this session and in turn with the user who initiated this session Hidden-form authentication: A less commonly used variant of the aforementioned scheme uses hidden form fields to transfer the session token, rather than cookies Here, the application dynamically renders HTML forms for all navigational elements, including a hidden field containing the session token.

Listing 3-1. Vertical Boxes with Default Packing (boxes.c) #include <gtk/gtk.h> #define NUM_NAMES 4 const gchar* names[] = { "Andrew", "Joe", "Samantha", "Jonathan" }; int main (int argc, char *argv[]) { gint i; GtkWidget *window, *vbox; gtk_init (&argc, &argv);

Just like we crafted a presentation model to represent a display, we can craft a model to represent the data coming into our application. And just as a strong presentation model made it easy to work with our data in the view, a strong input model makes it easy to work with user input in our application. Instead of working with error-prone

After the list store is created, you need to call gtk_tree_view_set_model() to add it to the tree view. By calling this function, the reference count of the tree model will be incremented by one. Therefore, if you want the tree model to be destroyed when the tree view is destroyed, you will need to call g_object_unref() on the list store.

string keys and inspecting request values that hopefully match input element names, we can leverage ASP.NET MVC 2 features to work with a strong input model.

3 It is important to note that in the case of both HTTP and cookie-based authentication, the browser caches the credential that is used to authenticate subsequent HTTP requests (the user s username/password, or the session cookie, respectively) and automatically supplies the credential along with any request made from that browser to the web server for which the credential is cached (eg, wwwmywwwservicecom) In particular, this includes requests that may be surreptitiously initiated by a malicious page, as shown in Section 1012 In other words, a malicious page can cause the user s browser to make requests to wwwmywwwservicecom that, a priori, will be processed by our application as if they were initiated by the user identified and authenticated by the credential in question..