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/* Based on the height of the page and font size, calculate how many lines can be * rendered on a single page. A padding of 3 is placed between lines as well. */ height = gtk_print_context_get_height (context) - HEADER_HEIGHT - HEADER_GAP; w->data->lines_per_page = floor (height / (w->data->font_size + 3)); w->data->total_pages = (w->data->total_lines - 1) / w->data->lines_per_page + 1; gtk_print_operation_set_n_pages (operation, w->data->total_pages); g_free (contents); } To calculate the number of pages required by the print operation, you need to figure out how many lines can be rendered on every page. The total height of every page is retrieved with gtk_print_context_get_height(), which is stored in a GtkPrintContext object. GtkPrintContext is used to store information about how to draw the page. For example, it stores the page setup, width and height dimensions, and dots per inch in both directions. We will go into more detail in the draw-page callback function later in this chapter. Once you have the total height of the page that will be available for rendering text, the next step is to divide that height by the font size of the text plus 3 pixels of spacing to be added between each line. The floor() function was used to round down the number of lines per page so that clipping will not occur along the bottom of every full page. Once you have the number of lines per page, you can calculate the number of pages. Then, you must send this value to gtk_print_operation_set_n_pages() by the end of this callback function. The number of pages will be used so that GTK+ knows how many times to call the draw-page callback function. This must be set to a positive value, so rendering will not begin until it is changed from its default value of -1.

Summary

OTP products generate a new password each time a user needs to log in. One such product, offered by RSA Security, is the SecurID card (other companies have different names for such cards). The SecurID card is a device that flashes a new password to the user periodically (every 60 seconds or so). When the user wants to log into a computer system, he enters the number displayed on the card when prompted by the server. The server knows the algorithm that the SecurID card uses to generate passwords, and can verify the password that the user enters. There are many other variations of OTP systems as well. For instance, some OTP systems generate passwords for their users only when a personal identification number (PIN) is entered. Also, while OTP systems traditionally required users to carry additional devices, they are sometimes now integrated into personal digital assistants (PDAs) and cell phones.

The next step is to implement the draw-page callback function, which will be called once for every page that needs to be rendered. This callback function requires the introduction of another library called Cairo. Cairo is a vector graphics library that is used to render print operations, among other things. Listing 12-5 begins by retrieving the Cairo drawing context for the current GtkPrintContext with gtk_print_context_get_cairo_context(). The cairo_t object will be used to render print content and then apply it to the PangoLayout. At the beginning of this callback function, we also need to retrieve two other values from the GtkPrintContext. The first is gtk_print_context_get_width(), which returns the width of the document. Notice that we do not need to retrieve the height of the page, since we have already calculated the number of lines that will fit on each page. If the text is wider than the page, it will be clipped. You will have to alter this example in order to avoid clipping the document.

In this chapter, we learned about a richer, more functional model we use to represent the real-world problems and things our application manages. We learned about the different types of domain objects and how we can group those objects into aggregates to specify logical boundaries. We learned about abstracting persistence with repositories, where queries are expressed as methods in the domain language. In the next chapter, we ll tread deep into controller territory, exploring ASP.NET MVC 2 features and extensibility points that will be our technical base for success with the framework.

Caution The width returned by the GtkPrintContext is in pixels. You need to be careful because different functions may use alternative scales such as Pango units or points!

Understanding the controller extensibility points Discovering the requirements for an action Using action selectors Creating custom action results Reducing controller complexity with action results

Another mechanism that can authenticate users based on something that they have is a smart card A smart card is tamper-resistant, which means that if a bad guy tries to open the card or gain access to the information stored on it, the card will self-destruct The card will not selfdestruct in a manner similar to what comes to mind when you think of Mission Impossible Rather, the microprocessor, memory, and other components that make up the smart part of the smart card are epoxied (or glued) together such that there is no easy way to take the card apart The only feasible way to communicate with the microprocessor is through its electronic interface Smart cards were designed with the idea that the information stored in the card s memory would only be accessible through the microprocessor.