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Figure 8-12. Spin Button renderers You will notice that the floating point numbers in the first column in Figure 8-12 show multiple decimal places. You can set the number of decimal places shown in the spin button but not the displayed text. To decrease or eliminate the number of decimal places, you should use a cell data function. An example of a cell data function that hides decimal places is shown in Listing 8-13. Listing 8-13. Cell Data Function for Floating Point Numbers static void cell_data_func (GtkTreeViewColumn *column, GtkCellRenderer *renderer, GtkTreeModel *model, GtkTreeIter *iter, gpointer data) { gfloat value; gchar *text; /* Retrieve the current value and render it with no decimal places. */ gtk_tree_model_get (model, iter, QUANTITY, &value, -1); text = g_strdup_printf ("%.0f", value); g_object_set (renderer, "text", text, NULL); g_free (text); } Recall that if you want to dictate the number of decimal places shown by a floating point number in a column using GtkCellRendererText or another derived renderer, you need to use a cell data function. In Listing 8-13, a sample cell data function was shown that reads in the current floating point number and forces the renderer to display no decimal places. This is necessary because GtkCellRendererSpin stores numbers as floating point numbers.

Next, we create our ActionExecutingContext D but call only the no-argument constructor. The controller can be any controller instance, and we again use Rhino Mocks to create a stub implementation of ControllerBase E. Rhino Mocks creates a subclass of ControllerBase at runtime, which saves us from using an existing or dummy controller class. In any case, the ControllerBase provides ViewData, so we don t need to provide any stub implementation for that property. With our assembled ActionExecutingContext and stubbed implementation of IUserSession, we can create and exercise our CurrentUserFilter F. The OnExecutingMethod doesn t return a value, so we need to examine only the ActionExecutingContext passed in. We assert that the controller s ViewData contains the same loggedin user created earlier G, and our test passes! Getting to this point required trial and error to understand what the context object required for execution. Because filters are integrated and specific to the MVC Framework, it can be fruitless to try to write filters using test-first test-driven development only the fact that the complete website is up and running proves the filter is working properly. We supplied dummy implementations of the context objects, but we constructed them in a way that the MVC Framework will likely not use.

GtkCellRendererSpin is compatible with both integers and floating point numbers, because its parameters are stored in a GtkAdjustment. Listing 8-14 is an implementation of the Grocery List application in which the Quantity column is rendered with GtkCellRendererSpin. Listing 8-14. Spin Button Cell Renderers static void setup_tree_view (GtkWidget *treeview) { GtkCellRenderer *renderer; GtkTreeViewColumn *column; GtkAdjustment *adj; adj = GTK_ADJUSTMENT (gtk_adjustment_new (0.0, 0.0, 100.0, 1.0, 2.0, 2.0)); renderer = gtk_cell_renderer_spin_new (); g_object_set (renderer, "editable", TRUE, "adjustment", adj, "digits", 0, NULL); g_signal_connect (G_OBJECT (renderer), "edited", G_CALLBACK (cell_edited), (gpointer) treeview); column = gtk_tree_view_column_new_with_attributes ("Count", renderer, "text", QUANTITY, NULL); gtk_tree_view_append_column (GTK_TREE_VIEW (treeview), column); /* ... Add a cell renderer for the PRODUCT column ... */ } /* Apply the changed text to the cell. */ static void cell_edited (GtkCellRendererText *renderer, gchar *path, gchar *new_text, GtkTreeView *treeview) { GtkTreeIter iter; GtkTreeModel *model; GtkAdjustment *adjustment; gdouble value; /* Retrieve the current value stored by the spin button renderer's adjustment. */ g_object_get (renderer, "adjustment", &adjustment, NULL); value = gtk_adjustmnet_get_value (adjustment);

Message and data integrity are very important to prevent such mischief The SSL protocol uses message authentication codes in the messages that are sent between Alice and the web site to make sure that no competitor or other malicious party can tamper with the data Availability: DVD-Factory may have a competitor that launches a DoS attack against the site in order that Alice will stop buying from DVD-Factory and instead come to their competing site As part of DVD-Factory s security strategy, its web site needs to be kept running and available 24 hours a day, 7 days a week One simple (but potentially expensive) approach that DVD-Factory might use to mitigate a DoS attack against it would be to overprovision their bandwidth to handle the increased traffic load caused by illegitimate clients.

26.6 Summary