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GTK+ will not automatically scroll to search matches that you select. To do this, you need to first call gtk_text_buffer_create_mark() to create a temporary GtkTextMark at the location of the found text. GtkTextMark* gtk_text_buffer_create_mark (GtkTextBuffer *buffer, const gchar *name, const GtkTextIter *location, gboolean left_gravity); The second parameter of gtk_text_buffer_create_mark() allows you to specify a text string as a name for the mark. This name can be used to reference the mark at a later time without the actual mark object. The mark is created at the location of the specified text iterator. The last parameter will create a mark with left gravity if set to TRUE.

UI is the presentation of the model Listing 23.11 Action filters applied to controller to keep concerns separated

using System.Web.Mvc; namespace UI.Controllers { Applies [HandleError] VisitorAdditionFilter [VisitorAdditionFilter(Order = 0)] [VisitorRetrievalFilter(Order = 1)] Applies public class HomeController : Controller VisitorRetrievalFilter { public ActionResult Index() { ViewData["Message"] = "Welcome to ASP.NET MVC!";

The next step is to add the ability to remove products from the list. Since we have added the ability for multiple rows to be selected, the code must also be able to remove more than one row. Listing 8-7 implements two functions. The first function, remove_row(), is called for every selected row, removing the row if it is not a category. If the removed row was to be purchased, its quantity is removed from the category s running total. The second function, remove_products(), is the callback function that is run when the GTK_STOCK_REMOVE button is clicked.

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return View(); } public ActionResult About() { return View(); } } }

Listing 8-7. Removing One or More Products (selections.c) static void remove_row (GtkTreeRowReference *ref, GtkTreeModel *model) { GtkTreeIter parent, iter; GtkTreePath *path; gboolean buy; gint quantity, pnum; /* Convert the tree row reference to a path and retrieve the iterator. */ path = gtk_tree_row_reference_get_path (ref); gtk_tree_model_get_iter (model, &iter, path); /* Only remove the row if it is not a root row. */ if (gtk_tree_model_iter_parent (model, &parent, &iter)) { gtk_tree_model_get (model, &iter, BUY_IT, &buy, QUANTITY, &quantity, -1); gtk_tree_model_get (model, &parent, QUANTITY, &pnum, -1); if (buy) { pnum -= quantity; gtk_tree_store_set (GTK_TREE_STORE (model), &parent, QUANTITY, pnum, -1); } gtk_tree_model_get_iter (model, &iter, path); gtk_tree_store_remove (GTK_TREE_STORE (model), &iter); } } static void remove_products (GtkButton *remove, GtkTreeView *treeview) { GtkTreeSelection *selection; GtkTreeRowReference *ref; GtkTreeModel *model; GList *rows, *ptr, *references = NULL; selection = gtk_tree_view_get_selection (treeview); model = gtk_tree_view_get_model (treeview); rows = gtk_tree_selection_get_selected_rows (selection, &model);

We ve introduced two filters, VisitorAdditionFilter B and VisitorRetrievalFilC. We ve applied the optional Order parameter to ensure that they re executed in the intended order. The order in which the attributes are applied to the class isn t guaranteed to be the execution order. We want to persist a new visitor and then retrieve the list of recent visitors and pass them to a view. Listing 23.12 shows both of the action filters.

/* Create tree row references to all of the selected rows. */ ptr = rows; while (ptr != NULL) { ref = gtk_tree_row_reference_new (model, (GtkTreePath*) ptr->data); references = g_list_prepend (references, gtk_tree_row_reference_copy (ref)); gtk_tree_row_reference_free (ref); ptr = ptr->next; } /* Remove each of the selected rows pointed to by the row reference. */ g_list_foreach (references, (GFunc) remove_row, model); /* Free the tree paths, tree row references and lists. */ g_list_foreach (references, (GFunc) gtk_tree_row_reference_free, NULL); g_list_foreach (rows, (GFunc) gtk_tree_path_free, NULL); g_list_free (references); g_list_free (rows); } When the GTK_STOCK_REMOVE button is pressed, remove_products() will be called. This function begins by calling gtk_tree_selection_get_selected_rows() in order to retrieve a doubly linked list of tree paths that point to the selected rows. Since the application will be altering the rows, the list of paths is converted into a list of row references. This will make sure that all of the tree paths will remain valid.

Ready-to-use HTML escape functions are available in libraries in many programming languages. It is advisable to carefully check the documentation or source code (if available) that all necessary characters are indeed escaped. For example, it is easily overlooked that the Python function cgi.escape (available in the library included in the standard Python distribution) does not escape quote characters unless requested via an optional argument, and even then only escapes double-quote characters. In certain contexts, we require other escaping functions (e.g., for JavaScript string literals); we introduce these functions in the appropriate context.

using System.Web.Mvc; using Core; namespace UI { public class VisitorAdditionFilter : ActionFilterAttribute { private readonly IVisitorRepository _repository; public VisitorAdditionFilter(IVisitorRepository repository) { _repository = repository; } public VisitorAdditionFilter() : this(new VisitorRepositoryFactory() .BuildRepository()) { } public override void OnResultExecuting( ResultExecutingContext filterContext) { var builder = new VisitorBuilder();

Note Remember that gtk_tree_selection_selected_foreach() cannot be used for this application,

Visitor visitor = builder.BuildVisitor(); _repository.Save(visitor);