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/* Otherwise, add the product as a child of the category. */ else { gtk_tree_store_append (store, &child, &iter); gtk_tree_store_set (store, &child, BUY_IT, list[i].buy, QUANTITY, list[i].quantity, PRODUCT, list[i].product, -1); } i++; } gtk_tree_view_set_model (GTK_TREE_VIEW (treeview), GTK_TREE_MODEL (store)); gtk_tree_view_expand_all (GTK_TREE_VIEW (treeview)); g_object_unref (store); scrolled_win = gtk_scrolled_window_new (NULL, NULL); gtk_scrolled_window_set_policy (GTK_SCROLLED_WINDOW (scrolled_win), GTK_POLICY_AUTOMATIC, GTK_POLICY_AUTOMATIC); gtk_container_add (GTK_CONTAINER (scrolled_win), treeview); gtk_container_add (GTK_CONTAINER (window), scrolled_win); gtk_widget_show_all (window); gtk_main (); return 0; } Tree stores are initialized with gtk_tree_store_new(), which accepts the same parameters as gtk_list_store_new(). These include the number of columns of data followed by a list of the data types corresponding to each tree model column. Adding rows to a tree store is a little different than adding rows to a list store. You add rows to a tree store with gtk_tree_store_append(), which accepts two iterators instead of one. The first iterator will point to the inserted row when the function returns, and the second iterator should point to the parent row of the new row. gtk_tree_store_append (store, &iter, NULL); In the preceding call to gtk_tree_store_append(), a root element was appended to the list by passing NULL as the parent iterator. The iter tree iterator was set to the location of the new row. The first iterator does not need to already be initialized, because its current contents will be overwritten when the function returns.

In some more sophisticated ACL schemes, another piece of information called a role is added, which enables a user or principal to access particular resources. Table 1-2 shows an example mapping of users to roles, and Table 1-3 shows a role-based ACL. In Table 1-2, Alice is both a programmer and an administrator, and Bob is both a programmer and a backup operator.3 Table 1-2. A User-Role Mapping

<asp:Content ID="indexContent" ContentPlaceHolderID="MainContent" runat="server"> <h2>New Customer</h2> <form action="<%= Url.Action("Save") %>" method="post"> <fieldset> Helper <div> for label <%= Html.LabelFor(x => x.FirstName) %> <%= Html.TextBoxFor(x => x.FirstName) %> Prints </div> text box <div> <%= Html.LabelFor(x => x.LastName) %> <%= Html.TextBoxFor(x => x.LastName) %> </div> <div> Outputs <%= Html.LabelFor(x => x.Active) %> check box <%= Html.CheckBoxFor(x => x.Active) %> <div> <button name="save">Save</button></div> </fieldset> </form> </asp:Content>

window = gtk_window_new (GTK_WINDOW_TOPLEVEL); gtk_window_set_title (GTK_WINDOW (window), "Boxes"); gtk_container_set_border_width (GTK_CONTAINER (window), 10); gtk_widget_set_size_request (window, 200, -1); vbox = gtk_vbox_new (TRUE, 5); /* Add four buttons to the vertical box. */ for (i = 0; i < NUM_NAMES; i++) { GtkWidget *button = gtk_button_new_with_label (names[i]); gtk_box_pack_start_defaults (GTK_BOX (vbox), button); g_signal_connect_swapped (G_OBJECT (button), "clicked", G_CALLBACK (gtk_widget_destroy), (gpointer) button); } gtk_container_add (GTK_CONTAINER (window), vbox); gtk_widget_show_all (window); gtk_main (); return 0; } Listing 3-1 shows a simple illustration of a GtkVBox widget. The graphical output of the application is shown in Figure 3-1. Notice that the names are shown in the same order as they were added to the array, even though each was packed at the start position.

The form in listing 2.6 is built with our input model, NewCustomerInput, from listing 2.5. Note the special HTML helpers that take a lambda expression B. These helpers will parse the lambda expressions and extract the property name, which will then be used as the value for the form element s name attribute. For example, a call to Html.TextBoxFor(x => x.LastName) would generate <input type="text" name="LastName" />. Before strongly typed helpers, we relied on magic strings, and programmers manually ensured consistency between the input form and the processing logic. With strongly typed helpers, like we use in listing 2.6, ASP.NET MVC 2 handles this coordination for the developer, so renaming a property won t cause our screen to malfunction. We cover these helpers in depth in chapter 3.

Figure 3-1. A vertical box packed from the start position In analyzing Listing 3-1, you should note that the GtkVBox and GtkHBox widgets use the same set of functions, because they are both derived from the GtkBox class. The only difference is that vertical boxes are created with gtk_vbox_new() and horizontal boxes with gtk_hbox_new(), although the parameters of each function are the same.

/home/* /*

Data Annotations, introduced with the .NET 3.5 SP1 release, are a set of attributes and classes defined in the System.ComponentModel.DataAnnotations assembly