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New progress bars are created with gtk_progress_bar_new(). The implementation of GtkProgressBar was made a lot simpler with the release of GTK+ 2.0, so be careful when using the API documentation, because a number of the displayed functions and properties are depreciated. The two examples following show you how to correctly use the GtkProgressBar widget. There are two ways to use the GtkProgressBar widget. If you are sure of how much progress a process has made, you should use gtk_progress_bar_set_fraction() to set a discrete value. This function accepts values between 0.0 and 1.0, where 1.0 sets the progress bar as 100 percent complete. while (percent <= 100.0) { gchar *message = g_strdup_printf ("%.0f%% Complete", percent); gtk_progress_bar_set_fraction (progress, percent / 100.0); gtk_progress_bar_set_text (progress, message); while (gtk_events_pending ()) gtk_main_iteration (); g_usleep (500000); percent += 5.0; } You may also want to display text that can be used to complement the progress bar. In the preceding example, gtk_progress_bar_set_text() was used to display the percent complete statistic, which is superimposed on the progress bar widget. If you are not able to detect the progress of the process, you can use pulses. In the preceding example, gtk_progress_bar_pulse() was used to move the progress bar one step for every pending event that was processed. You can set the pulse step with gtk_progress_bar_set_pulse_step(). gtk_progress_bar_set_pulse_step (GTK_PROGRESS_BAR (bar), 0.1); while (gtk_events_pending ()) { gtk_main_iteration (); gtk_progress_bar_pulse (); } By setting the pulse step to 0.1, the progress bar will fill itself up in the first ten steps and clear itself out in the next ten. This process will continue for as long as you continue pulsing the progress bar.

public virtual ActionResult LogOff() { FormsService.SignOut(); return RedirectToAction("Index", "Home"); }

There are times that you may want to skip to specific assistant pages if conditions are correct. For example, let us assume your application is creating a new project. Depending on the chosen language, you want to jump to either the third or fourth page. In this case, you will want to define your own GtkAssistantPageFunc function for forward motion.

Instead of referring to the Index action on the Home controller by strings, we can instead navigate the hierarchy created in the generated MVC class shown in listing 21.10.

In the RSA and ECC schemes described previously, Alice would need to acquire Bob s public key certificate before sending an encrypted message to him (or else she could not be sure that she would be encrypting with Bob s public key, and not that of an impostor) Alice would either have to request Bob s public key certificate from Bob, from a directory, or from the CA Part of the reason for the existence of the public key certificate is that in both RSA and ECC, Bob s public key, kp, is a string of bytes that happens to satisfy the constraint F 1(F(m,kp),ks) = m, and the certificate binds kp to Bob s identity However, if Bob s public key could instead be, say, his e-mail address (bob@learnsecurity com), then Alice would not have to fetch Bob s public key certificate if she knows his e-mail address.

You can use gtk_assistant_set_forward_page_func() to define a new page forward function for the assistant. By default, GTK+ will increment directly through the pages in order, one page at a time. By defining a new forward function, you can define the flow. void gtk_assistant_set_forward_page_func (GtkAssistant *assistant, GtkAssistantPageFunc page_func, gpointer data, GDestroyNotify destroy_func); For example, assistant_forward() is a simple GtkAssistantPageFunc implementation that moves from page two to either three or four depending on the condition returned by decide_next_page(). static gint assistant_forward (gint current_page, gpointer data) { gint next_page = 0; switch (current_page) { case 0: next_page = 1; break; case 1: next_page = (decide_next_page() 2 : 3); break; case 2: case 3: next_page = 4; break; default: next_page = -1; } return next_page; }

public virtual ActionResult LogOff() { FormsService.SignOut(); return RedirectToAction(MVC.Home.Index()); }

Note By returning -1 from a page forward function, the user will be presented with a critical error and

Internally, the new RedirectToAction method lives on the generated partial controller class. The Index method in listing 21.10 records the controller and action name, allowing the generated RedirectToAction method to build the correct ActionResult. All of this is behind the scenes, and our existing controllers can start using the new generated overloads to generate ActionResult objects. In our views, we ll use some generated HtmlHelper extension methods for generating action links and URLs. Listing 21.11 shows our modified logon partial.