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/* Set up the third column in the tree view to be editable. */ renderer = gtk_cell_renderer_text_new (); g_object_set (renderer, "editable", TRUE, "editable-set", TRUE, NULL); g_signal_connect (G_OBJECT (renderer), "edited", G_CALLBACK (cell_edited), (gpointer) treeview); column = gtk_tree_view_column_new_with_attributes ("Product", renderer, "text", PRODUCT, NULL); gtk_tree_view_append_column (GTK_TREE_VIEW (treeview), column); } /* Apply the changed text to the cell if it is not an empty string. */ static void cell_edited (GtkCellRendererText *renderer, gchar *path, gchar *new_text, GtkTreeView *treeview) { GtkTreeIter iter; GtkTreeModel *model; if (g_ascii_strcasecmp (new_text, "") != 0) { model = gtk_tree_view_get_model (treeview); if (gtk_tree_model_get_iter_from_string (model, &iter, path)) gtk_list_store_set (GTK_LIST_STORE (model), &iter, PRODUCT, new_text, -1); } } Creating editable GtkCellRendererText cells is a very simple process. The first thing you need to do is set the editable and editable-set properties of the text renderer to TRUE. g_object_set (renderer, "editable", TRUE, "editable-set", TRUE, NULL); Remember that setting the editable property with g_object_set() will apply it to the whole column of data that is drawn by the renderer. If you want to specify row by row whether the cell should be editable, you should add it as an attribute of the column. The next thing you need to do is connect the cell renderer to the edited signal provided by GtkCellRendererText. The callback function for this signal receives the cell renderer, a GtkTreePath string pointing to the edited row, and the new text that was entered by the user. This signal is emitted when the user presses the Enter key or moves focus from the cell s GtkEntry while the cell is being edited. The edited signal is necessary, because changes are not automatically applied to the cell. This allows you to filter out invalid entries. For example, in Listing 8-9, the new text is not applied when the new string is empty.

In this chapter, we looked at how views can quickly become unmanageable when they re filled with logical checks and formatting that s best handled elsewhere. We first tried manually mapping custom presentation models, which worked well but is tedious and error prone. We then looked at AutoMapper, which maps values from one object to another according to its configuration. We saw how to initialize and configure AutoMapper, how to follow the conventions, and how to leverage AutoMapper hooks to globally apply formatting. In the next chapter, we ll look at how to keep controllers lightweight and under control. By striving to reduce duplication and eliminate developer friction, we ll craft small and targeted controller actions.

Using lightweight controllers to simplify programming Managing common view data without filter attributes Deriving action results to apply common behavior Using an application bus

if (gtk_tree_model_get_iter_from_string (model, &iter, path)) gtk_list_store_set (GTK_LIST_STORE (model), &iter, PRODUCT, new_text, -1); Once you are ready to apply the text, you can convert the GtkTreePath string directly into a GtkTreeIter with gtk_tree_model_get_iter_from_string(). This function returns TRUE if the iterator was successfully set, which means that the path string points to a valid row.

Now that we have covered a number of key security concepts, let us examine how those concepts work together in a typical web client/web server interaction. Suppose Alice is an employee of a company called PCs-R-Us, and her job responsibility is to order DVD drives for the company s PCs from a company called DVD-Factory. DVD-Factory has a web site that Alice uses to procure DVDs for her company. The following points examine why DVD-Factory might want to care about the security goals discussed in this chapter when implementing its web site. Authentication: If a malicious competitor is trying to steal business from DVD-Factory, the competitor could create a web site that looks exactly like the DVD-Factory web site, but at a different web address. To combat that tactic, DVD-Factory needs to make sure that the web server can be authenticated so that when Alice goes to the DVD-Factory web site, she knows she is dealing with DVD-Factory and not DVD-Factory s look-alike competitor. The SSL protocol is used between web clients and web servers to do secure transactions. When Alice enters the web address https://www.dvd-factory.biz, Alice s browser will invoke the SSL protocol to make sure that the web site authenticates itself to her browser. (We will talk more about how the SSL protocol accomplishes this later in the book, but at this point, it is important to note that the web browser authenticates the web site to make sure that it is dealing with DVD-Factory s web site and not another web site that is trying to spoof or imitate it.)

Do you remember those swollen and unwieldy Page_Load methods in Web Forms Those methods can quickly grow out of control and stage a revolt against your code base. Controller actions are dangerous too. Nestled snugly between the model and view, controllers are an easy place to put decision-making code, and they re often mistaken for a good place to put that logic. And it s quite convenient, at first. It just takes two lines of code to build a select list in an action method. And adding a filter attribute to the controller is a simple way to manage global data for a master page. But these techniques don t scale with greater complexity. Orchestrating a process to find a particular order, authorize it, transmit it to the shipping service, and email a receipt to the user, before redirecting the client to the confirmation page That s too much for our controller to handle.

Caution You will always want to check that the path is valid, even though it is supplied by GTK+,