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After the PangoLayout is set up, the whole widget is cleared, which readies the widget to be drawn. This is performed with gdk_window_clear_area(), which clears the area from the coordinates (x,y) to (x + width,y + height). void gdk_window_clear_area (GdkWindow *window, gint x, gint y, gint width, gint height);

Returning the right result is straightforward it s like the normal ViewResult, but we have to supply the destination type, CustomerInfo (which is our presentation model) B. Our helper function C does the heavy ViewData and TempData lifting. In the next section we ll lighten our controller even further using an application bus and a simple abstraction around a common controller theme: controlling storyboard flow for success and failure.

Once we clear the area, the layout can be drawn on the screen with gdk_draw_layout(). This function first accepts the GdkDrawable object to draw on, which is the GdkWindow. The second parameter is the graphics context to use, which is stored by the GtkStyle member of the class. void gdk_draw_layout (GdkDrawable *drawable, GdkGC *gc, gint x, gint y, PangoLayout *layout); Lastly, you need to specify the x and y positions at which to draw the layout. You should note that these positions do not have to be in the window. Initially, the layout is drawn off the right side of the widget, so that it can scroll to the left. Also, it will not be reset to the initial position until it is completely hidden from view on the left side. Therefore, at the end of a scrolling cycle, the x coordinate will actually be negative.

In large distributed systems, eliminating dependencies isn t just a good idea, it s required. Architects designing these systems have learned that they must create a myriad of atomic services that can be reused and composed by several applications, just like application architects design classes to be reused and composed inside programs. But unlike classes inside programs, services shouldn t be coupled to physical network locations or to specific programming platforms. When a system is composed of services spread across a large network, rather than a shared memory space, extreme flexibility in deployment and configuration is necessary. The metaphor that best describes the way many distributed systems work is sending and receiving messages. One application will send a command message to a bus. The bus is responsible for, among other things, routing the message to ensure it s handled by the appropriate recipient. Services share a message schema, but their implementations can vary widely, even as far as being developed on different platforms. As long as the recipient understands the message, the services can work together. They don t need to depend on each other, just on the bus. Such systems are described as being loosely coupled. This is a gross oversimplification of message-based, service-oriented architectures, but these distributed systems can provide insight into better ways of designing in-process applications. What if, instead of depending on an IOrderShippingService, our controller in listing 19.2 sent a message to a bus, as shown in listing 19.13

Another weak link in the corporate security plan is people In fact, in our previous example of weak passwords, an employee who chooses a password that is simply her name in reverse could be considered a weak link Even if an employee chooses a good password, she might get conned by a phone call from the company s system administrator asking her for the password Usually, the bigger the company, the more likely that these types of people-based attacks will work the larger the company, the more often employees may need to trust people that they don t know in the regular course of their day.

Wrapping the cache in our interface allowed us to write code decoupled from a specific implementation. It also aided us during testing. If we hadn t abstracted this concept, our controller would remain untestable.

In addition to the ability to draw a PangoLayout object to a GdkWindow object, GDK provides a number of other primitive drawing functions through the GdkDrawable object. A full list of these can be found in the GDK API documentation. Table 11-4 lists these functions, so that you can easily find the one that you need. Table 11-4. GdkDrawable Functions