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events that are rarely used in normal applications) they most often allow the developer to short-circuit the signal, that is to prevent it from propagating any further. The first argument of the callback will always be the object the signal occurred on, and the last will be the data argument you gave to g_signal_connect() (unless you used g_signal_ connect_swapped(), which swaps the two arguments). Other arguments may exist, sandwiched by these two. Note that there is only a single void pointer for assigning data to be sent to the callback function. If you need to send more than one variable, you will need to create your own struct and pass a pointer to it. Make sure to clean up any allocated memory in the callback function if necessary. But be sure not to free any memory until you re sure the callback will never be called with that data again. This may mean not destroying it until the widget is destroyed. You can connect a callback to the "destroy" signal of a widget to receive that notification. This is also the signal to connect to in order to detect when a GtkWindow is closed.

Figure 4-3. Executing sar -u Table 4-8 lists relevant columns and descriptions of the data displayed by executing sar -r to capture memory utilization. Table 4-8. Statistics Displayed by the sar -r Command

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So far this chapter, we ve created an application that creates an empty window. However, because we don t have any code to run when the window is closed, the program continues to run with no visible UI. Let s create a callback function that calls gtk_main_quit() and attach it to the "destroy" signal of the window: #include <gtk/gtk.h> /* This is our new callback function. */ /* The names of callback functions are often appended with _cb */ void window_destroy_cb(GtkObject *window, void *data) { /* This call causes gtk_main() to return, terminating your application */ gtk_main_quit(); } int main(int argc, char *argv[]) { GtkWidget *window, *toolbar, *tool_button; gtk_init(&argc, &argv); window = gtk_window_new(GTK_WINDOW_TOPLEVEL); gtk_window_set_default_size(GTK_WINDOW(window), 100, 100); gtk_window_set_title(GTK_WINDOW(window), "Window") /* Here I attach the signal. I won't need any extra data in; * the callback, so I use NULL as the data */ g_signal_connect(G_OBJECT(window), "destroy", window_destroy_cb, NULL); gtk_widget_show_all(window); gtk_main(); return 0; }

comment-moderation system was developed. It began as a piece of code tightly tied to one particular third-party weblogging application, and then evolved into a generic moderation system that could work with any model in any application. At that point, it was spun off into a separate (still third-party) application, designed to enhance and extend Django s comments system. That application turned out to be quite popular, so in Django 1.1 the moderation features were incorporated directly into django.contrib.comments, which is the most logical place for them to be.

Free memory in KB Memory used in KB Percentage of memory used Free swap space in KB Used swap space in KB Percentage of used swap space

This program will create an empty window and terminate when the window is closed. I will use the same signal concept throughout the rest of this chapter as I explain what signals are emitted by widgets.

Now that you have the {% if_rated %} tag, you can add a second, complementary tag to retrieve the user s rating for a particular snippet. This new {% get_rating %} tag lets you set up a template like this: {% load snippets %} {% if_rated user snippet %} {% get_rating user snippet as rating %} <p>You rated this snippet <strong>{{ rating.get_rating_display }}</strong>.</p> {% endif_rated %} When a user has rated a snippet, this code should end up displaying something like, You rated this snippet useful. This new tag s compilation function, do_get_rating, is straightforward: def do_get_rating(parser, token): bits = token.contents.split() if len(bits) != 5: raise template.TemplateSyntaxError("%s tag takes four arguments" % bits[0]) if bits[3] != 'as': raise template.TemplateSyntaxError("Third argument to %s must be 'as'" % bits[0]) return GetRatingNode(bits[1], bits[2], bits[4])

Gaim itself has its own signals system used by plug-ins Using these signals is very similar to using GTK+ s signals, but Gaim signals are better suited to what Gain plug-ins need While GTK+ signals communicate interface events, such as a check box being toggled, Gaim signals communicate events such as a buddy signed on, or a message was received Signals like these are useful for plug-ins; most of them are specifically interested in processing incoming and outgoing messages Gaim plug-ins will often want to know anytime a message comes in or a buddy signs off, for instance Unlike GTK+ signals, which are closely tied to an instance (they get triggered only when one particular button is clicked), Gaim signals are globally called when any buddy signs in or conversation receives a new message.

Figure 4-4 shows the output of the sar -r command, displaying server data for six samples with 5-second intervals between each sample.

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