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In this chapter, we walked through two examples that taught you how to derive new objects. The first created a new widget called MyIPAddress, which was derived from GtkEntry. The second new widget was MyMarquee, which scrolls a message across the screen. This example taught you how to create a new widget from scratch, literally drawing it part by part on the screen. Next, you were introduced to how interfaces are implemented and used in GTK+. This allows you to create your own interfaces or to use those that already exist for new widgets that you create. In the next chapter, you will be learning about a number of widgets that did not fit into previous chapters. These include printing widgets, recent file support, calendars, automatic completion entries, status icons, and drawing areas.

In the view, we access the data that was provided by the controller. Notice how we use code blocks, <%= %>, to output the values. Now we re done with our feature. If you run the application one more time and fill out some values (figure 1.9), you should be taken to a new page that shows what you submitted (figure 1.10).

The GdkEventType enumeration provides a list of available event types. These can be used to determine the type of event that has occurred, since you may not always know what has happened. For example, if you connect the button-press-event signal to a widget, there are three different types of events that can cause the signal s callback function to be run: GDK_BUTTON_PRESS, GDK_2BUTTON_PRESS, and GDK_3BUTTON_PRESS. Double-clicks and triple-clicks emit the GDK_BUTTON_PRESS as a second event as well, so being able to distinguish between different types of events is necessary. In Appendix B, you can see a complete list of the events available to you. It shows the signal name that is passed to g_signal_connect(), the GdkEventType enumeration value, and a description of the event. Let s look at the delete-event callback function from Listing 2-2. We already know that delete-event is of the type GDK_DELETE, but let us assume for a moment that we did not know that. We can easily test this by using the following conditional statement: static gboolean delete_event (GtkWidget *window, GdkEvent *event, gpointer data) { if (event->type == GDK_DELETE) return FALSE; return TRUE; } In this example, if the event type is GDK_DELETE, FALSE is returned, and gtk_widget_destroy() will be called on the widget. Otherwise, TRUE is returned, and no further action is taken.

This is all built on the concept that the less functionality one has to look at in a given application, the less security exposure and vulnerability that piece of software will have Software that is simple will be easier to test and keep secure..

Your first application is complete. Although it s functional, it contains a number of problems that your authors consider bad practices:

Sometimes, you may already know what type of event has been emitted. In the following example, we know that a key-press-event will always be emitted: g_signal_connect (G_OBJECT (widget), "key-press-event" G_CALLBACK (key_press), NULL); In this case, it is safe to assume that the type of event will always be GDK_KEY_PRESS, and the callback function can be declared as such. static gboolean key_press (GtkWidget *widget, GdkEventKey *event, gpointer data)

The URL in the form tag is hard-coded. If we change the URL structure, this will break. There s no model. We dealt purely with primitive values. Using ViewData["foo"] utilizes magic strings and relies on casting to do anything meaningful with the data. The URL still says Sign even though we rendered the ThankYou view. This is because we didn t redirect to a success page; we simply rendered one. This causes the next unfortunate aspect of the site If you refresh this page, it will prompt you to submit the data again. If the user obliges, two records will be posted with the same data.

Since we know that the type of event is a GDK_KEY_PRESS, we will not need access to all of the structures in GdkEvent. We will only have a use for GdkEventKey, which we can use instead of GdkEvent in the callback function. Since the event is already cast as GdkEventKey, we will have direct access to only the elements in that structure. typedef struct { GdkEventType type; GdkWindow *window; gint8 send_event; guint32 time; guint state; guint keyval; gint length; gchar *string; guint16 hardware_keycode; guint8 group; guint is_modifier : 1; } GdkEventKey;