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CHAPTER 10 DYNAMIC USER INTERFACES
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Once you have initialized the user interface by creating a new GladeXML object, you can retrieve widgets with glade_xml_get_widget(). This function returns a widget that is already instantiated, which is referred to by the name you gave it in Glade. GtkWidget* glade_xml_get_widget (GladeXML *xml, const char *name); The widget returned by glade_xml_get_widget() is already set up with all of the properties that you set in Glade. You can use this widget like any other GtkWidget that was created in your application using the functions provided in GTK+. This shows one of the main advantages of Libglade you do not have to provide all of the monotonous code for setting up the user interface and can quickly get to developing more interesting aspects of the application. Another useful function is glade_xml_get_widget_prefix(), which allows you to retrieve a list of widgets that have the same prefix as the given string. If you name all of your widgets according to their type or what window they belong to, this function can be very helpful. GList* glade_xml_get_widget_prefix (GladeXML *xml, const char *name);
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Connecting Signals
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The next step in getting your application ready for use is to connect the signal handlers that you created in Glade. In Listing 10-1, glade_xml_signal_autoconnect() was used to connect all of the signals at once. void glade_xml_signal_autoconnect (GladeXML *xml); To autoconnect signals, Libglade opens a NULL version of GModule, which will provide access to your application s symbol table. The function then tries to find functions with the same signal handler name, which means that the names in the Glade file must match those of the callback functions in your application. This function will work only if GModule is supported on the user s system. Another option for connecting signals is to use glade_xml_signal_autoconnect_full(). This function allows you to provide a callback function that will connect all of the signals for you. This way you can provide any necessary customization. void glade_xml_signal_connect_full (GladeXML *self, const gchar *handler_name, GladeXMLConnectFunc connect_func, gpointer data); Listing 10-2 presents a simple GladeXMLConnectFunc implementation that uses GModule in the same way as in glade_xml_signal_autoconnect(). This function is called for every signal in the Glade user interface file.
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CHAPTER 10 DYNAMIC USER INTERFACES
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Listing 10-2. Autoconnecting Signals static void connect_func (const gchar *callback_name, GObject *object, const gchar *signal_name, const gchar *signal_data, GObject *connect_object, gboolean connect_after, gpointer data) { static GModule *module_self = NULL; gpointer handler_func; module_self = g_module_open (NULL, 0); g_assert (module_self != NULL); if (g_module_symbol (module_self, callback_name, &handler_func)) { if (connect_object && connect_after) g_signal_connect_object (object, signal_name, handler_func, connect_object, G_CONNECT_AFTER); else if (connect_object && !connect_after) g_signal_connect_object (object, signal_name, handler_func, connect_object, G_CONNECT_SWAPPED); else if (!connect_object && connect_after) g_signal_connect_after (object, signal_name, handler_func, data); else g_signal_connect (object, signal_name, handler_func, data); } else g_warning ("The callback function could not be found: %s", callback_name); } You already know how to use GModule, so the code in Listing 10-2 should be understandable to you. However, there are two new functions used for connecting signals that were introduced in Listing 10-2, which I will explain now. When you connect a signal with g_signal_connect(), your callback function will be run before the standard callback function. This allows you to override the standard callback with your own in some cases. Alternatively, if you want your callback function to run after the default, you can connect the signal with g_signal_connect_after(). gulong g_signal_connect_after (gpointer object, const gchar *signal_name, GCallback handler, gpointer data); Another useful signal connection function is g_signal_connect_object(), but it temporarily increases the reference count to ensure that the GObject provided to the fourth parameter will
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CHAPTER 10 DYNAMIC USER INTERFACES
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remain for the duration of the callback function. Also, gobject is sent to the callback function instead of the object. gulong g_signal_connect_object (gpointer object, const gchar *signal_name, GCallback handler, gpointer gobject, GConnectFlags flags); The g_signal_connect_object() function accepts flags from the following GConnectFlags enumeration: G_CONNECT_AFTER: If this flag is set, the callback function will be called after the default signal handler. This is similar to calling g_signal_connect_after(). G_CONNECT_SWAPPED: If this flag is set, the signal data will be sent to the callback function as the first parameter followed by the initiating GObject. This is similar to calling g_signal_connect_swapped().
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Tip G_CONNECT_SWAPPED may not seem useful at first, but it can be used to call a function on only the user data parameter. For example, if you use this flag when connecting a GTK_STOCK_QUIT menu item, you can connect it to gtk_widget_destroy() and pass the main window as the user data. This will cause the main window to be destroyed when the menu item is activated.
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In addition to autoconnecting signals, you can connect a signal with glade_xml_signal_ connect(). You need to specify the signal handler that you provided to Glade. The nice thing about this function is that the Glade signal handler and the actual function name do not need to be the same. This function is only for convenience and is equivalent to retrieving the widget and calling g_signal_connect() on it. void glade_xml_signal_connect (GladeXML *xml, const char *signal_name, GCallback callback_func); The problem with glade_xml_signal_connect() is that you cannot pass data to the callback function. To fix this, you can use glade_xml_signal_connect_data(), which allows you to specify a data parameter to pass to the callback function. void glade_xml_signal_connect_data (GladeXML *xml, const char *signal_name, GCallback callback_func, gpointer data); Unless you need to pass different data parameters to each function, it is a lot more convenient to simply allow Libglade to autoconnect all of the signals. Remember, though, that autoconnect will only work on systems that support GModule, so you should still know how to connect each signal one at a time!
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