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Listing 7-2 illustrates one of the simplest text view examples you could create. A new GtkTextView widget is created. Its buffer is retrieved, and text is inserted into the buffer. A scrolled window is then used to contain the text view. Listing 7-2. A Simple GtkTextView Example (textview.c) #include <gtk/gtk.h> int main (int argc, char *argv[]) { GtkWidget *window, *scrolled_win, *textview; GtkTextBuffer *buffer; gtk_init (&argc, &argv); window = gtk_window_new (GTK_WINDOW_TOPLEVEL); gtk_window_set_title (GTK_WINDOW (window), "Text Views"); gtk_container_set_border_width (GTK_CONTAINER (window), 10); gtk_widget_set_size_request (window, 250, 150);

This new test tries to prove that a route with some product name B in it will map to the Search action C, passing in the product name. Alas, our test fails, and our work isn t yet done. The test fails with the message MvcContrib.TestHelper.AssertionException : Expected Search but was SomeProductName. To make our test pass, we need to add the appropriate changes to the routes, as shown in listing 26.7.

textview = gtk_text_view_new (); buffer = gtk_text_view_get_buffer (GTK_TEXT_VIEW (textview)); gtk_text_buffer_set_text (buffer, "Your 1st GtkTextView widget!", -1); scrolled_win = gtk_scrolled_window_new (NULL, NULL); gtk_container_add (GTK_CONTAINER (scrolled_win), textview); gtk_container_add (GTK_CONTAINER (window), scrolled_win); gtk_widget_show_all (window); gtk_main(); return 0; } Most new GtkTextView widgets are created with gtk_text_view_new(). By using this function, an empty buffer will be created for you. This default buffer can be replaced at a later time with gtk_text_view_set_buffer() or retrieved with gtk_text_view_get_buffer(). If you want to set the initial buffer to one that you have already created, you can create the text view with gtk_text_view_new_with_buffer(). In most cases, it will be easier to simply use the default text buffer. Once you have access to a GtkTextBuffer object, there are many ways to add content, but the easiest method is to call gtk_text_buffer_set_text(). This function receives a text buffer, a UTF-8 text string to set as the buffer s new text, and the length of the text. void gtk_text_buffer_set_text (GtkTextBuffer *buffer, const gchar *text, gint length); If the text string is NULL-terminated, you can use -1 as the length of the string. This function will silently fail if a null character is found before the specified length of text. The current contents of the buffer will be completely replaced by the new text string. In the Text Iterators and Marks section, you will be introduced to functions that allow you to insert text into a buffer without overwriting the current content that are more suitable for inserting large amounts of text. Recall from the previous section that there are five widgets that have native scrolling abilities, including the GtkTextView widget. Because text views already have the facilities to manage adjustments, gtk_container_add() should always be used to add them to scrolled windows.

routes.MapRoute( "SearchProduct", "product/{name}", new {controller = "Product", action = "Search"} );

A variation of the attack in the previous section is possible if the attribute s value is not enclosed in quotes in the template Consider a template fragment in which the attribute s value is not enclosed in quotes, for example <img src=%(image_url)s> Suppose the attacker is able to cause the variable image_url to contain http://wwwexamplesiteorg/ onerror=evil-script; After substitution, this will result in the HTML fragment <img src=http://wwwexamplesiteorg/ onerror=evil-script;> Browsers are usually lenient in their parsing of HTML attributes, and assume that an attribute whose value is not enclosed in quotes ends at the first whitespace character or the end of the tag Thus, the preceding HTML will be parsed as an <img> tag with two attributes (ie, the attacker was able to inject an additional attribute) The ability to inject an arbitrary attribute can often be exploited to execute arbitrary script.

GtkTextView was created to be a very versatile widget. Because of this, many properties are provided for the widget. In this section, you will learn about a number of these widget properties. One feature that makes the text view widget extremely useful is that you are able to apply changes to the whole or only an individual part of the widget. Text tags are used to change the properties of a segment of text. Customizing only a part of the document will be covered in a later section of this chapter.

With this addition to our routes, our new test passes, along with all the other tests. We were able to add a new route to our routing configuration with the assurance that we didn t break the other URLs. Because URLs are now generated through routes in an MVC application, testing our routes becomes of utmost importance. The test helpers in MvcContrib wrapped up all the ugliness that usually comes with testing routes. In the next section, we ll examine how to avoid unnecessary test complexity.