rdlc data matrix

rdlc data matrix

rdlc data matrix

rdlc data matrix

rdlc data matrix

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Now that you have learned how to derive a new widget from one that already exists, it is time to learn how to create a widget from scratch. You will notice that a lot of the code in this section is similar to that in the previous. This is because new widgets are implemented in the same way as those that are derived, since they both have a base type of GObject; it just takes a little more work. In this section, you will learn how to implement a widget called MyMarquee. This widget scrolls a message from the right side of the widget to the left side, over and over. Make sure you understand this widget, because it will be your job to extend it in this chapter s exercise. You can view a screenshot of the MyMarquee widget in Figure 11-2. As with all of the examples in this book, you can download the full source code for this example on the book s web site.

You also have the option of using the DataSource controls, such as ObjectDataSource, SqlDataSource, and XmlDataSource. Of course, in doing this you ve completely circumvented the MVC pattern and placed all your data access directly in the view! Figure 7.5 illustrates the grid rendering properly.

The first step in setting up a new widget is to create the header file. This allows you to define the programmatic interface that will be used to control the widget. Listing 11-7 gives the full header file for the MyMarquee widget, which should appear very similar to the MyIPAddress header file. Listing 11-17. MyMarquee Widget Header (mymarquee.h) #ifndef __MY_MARQUEE_H__ #define __MY_MARQUEE_H__ #include <glib.h> #include <gdk/gdk.h> #include <gtk/gtkwidget.h>

The point of defense-in-depth is to not rely on any one defense to achieve security. Multiple mechanisms can help you achieve more security than just one. Some mechanisms (such as the security guards outside the bank) might help prevent attacks. In the case of a bank robbery, it is usually quite obvious when the robbery is taking place but in the world of network security, it may not even be clear when an attack is taking place. As such, some mechanisms might help you detect when attacks are taking place. Since it is not always possible to prevent attacks altogether, it is important to deploy mechanisms that help you manage or contain attacks while they are in progress. In some banks, bank tellers are stationed behind bulletproof glass, which helps contain the effect of a bank robbery by working to spare the lives of the bank tellers in the case that violence breaks out. After an attack takes place, you want to be able to recover from the attack, to whatever extent possible. Bank tellers may give the robbers a specially prepared briefcase of cash that will spurt dye on the robber when he opens it. The police

Figure 7.5 shows our newly bound GridView in action. Unfortunately, that s all you get, because none of the advanced features of the GridView will work. No sorting, paging, editing, or selecting. Because of this, it s of limited utility and will probably only aid you during prototyping and demos. All is not lost, however. In ASP.NET MVC you can achieve the Holy Grail of an editable data grid, complete with sorting, paging, and editing, when you structure it in a different way. In fact, UI component vendors like Telerik are already offering UI components for use with ASP.NET MVC. You can find a free grid component here: http://www.telerik.com/products/aspnet-mvc/grid.aspx.

G_BEGIN_DECLS (my_marquee_get_type ()) (G_TYPE_CHECK_INSTANCE_CAST ((obj), \ MY_MARQUEE_TYPE, MyMarquee)) #define MY_MARQUEE_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), \ MY_MARQUEE_TYPE, MyMarqueeClass)) #define IS_MY_MARQUEE(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), \ MY_MARQUEE_TYPE)) #define IS_MY_MARQUEE_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), \ MY_MARQUEE_TYPE)) typedef struct _MyMarquee MyMarquee; typedef struct _MyMarqueeClass MyMarqueeClass; struct _MyMarquee { GtkWidget widget; }; struct _MyMarqueeClass { GtkWidgetClass parent_class; }; GType my_marquee_get_type (void) G_GNUC_CONST; GtkWidget* my_marquee_new (void); void my_marquee_set_message (MyMarquee *marquee, const gchar *message); gchar* my_marquee_get_message (MyMarquee *marquee); void my_marquee_set_speed (MyMarquee *marquee, gint speed); gint my_marquee_get_speed (MyMarquee *marquee); void my_marquee_slide (MyMarquee *marquee); G_END_DECLS #endif /* __MY_MARQUEE_H__ */ Since MyMarquee is a new widget, it will be directly derived from GtkWidget. This is shown by the fact that MyMarquee contains a GtkWidget object and MyMarqueeClass contains a GtkWidgetClass class. Recall that neither of these members should be declared as pointers! Deriving the widget from GtkWidget allows you to take advantage of all of the signals and properties that are common to every widget, including event handling. #define MY_MARQUEE_TYPE #define MY_MARQUEE(obj)