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After you design your application in Glade, the next step is to load the user interface with Libglade. This library is used to parse the Glade user interface and create all of the necessary widgets at runtime. Libglade provides the GladeXML object that is used to create and hold the user interface loaded from an XML file. It can also be used to connect signals added in the Glade file to callback functions within your application. Another advantage of Libglade is that overhead is added only during initialization, and this is negligible compared to an interface created directly from code. After initialization, there is virtually no overhead added to the application. For example, GladeXML connects signal handlers internally in the same way as your own code, so this will require no extra processing. Since Libglade handles all of the widget initialization and the layout was already designed in Glade 3, the length of your code base can be significantly reduced. Take, for example, Listing 10-1, which would be significantly longer if you had to hand-code everything.
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CHAPTER 10 DYNAMIC USER INTERFACES
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Note The callback functions are not implemented in this example, because they are not relevant to the
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exercise. However, this application will be revisited in more detail in 13, which will include full implementation of the callback functions.
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Listing 10-1. Loading the User Interface (browser.c) #include <gtk/gtk.h> #include <glade/glade.h> void void void void void void void void void void on_back_clicked (GtkToolButton*); on_forward_clicked (GtkToolButton*); on_up_clicked (GtkToolButton*); on_refresh_clicked (GtkToolButton*); on_delete_clicked (GtkToolButton*); on_home_clicked (GtkToolButton*); on_info_clicked (GtkToolButton*); on_go_clicked (GtkButton*); on_location_activate (GtkEntry*); on_row_activated (GtkTreeView*, GtkTreePath*, GtkTreeViewColumn*);
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int main (int argc, char *argv[]) { GtkWidget *window; GladeXML *xml; gtk_init (&argc, &argv); xml = glade_xml_new ("browser.glade", NULL, NULL); window = glade_xml_get_widget (xml, "window"); glade_xml_signal_autoconnect (xml); gtk_widget_show_all (window); gtk_main (); return 0; }
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CHAPTER 10 DYNAMIC USER INTERFACES
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The code shown in Listing 10-1 will not compile with only GTK+ and its supporting libraries. You will need to include Libglade in the compile command, as follows: gcc -export-dynamic browser.c -o browser `pkg-config --cflags --libs gtk+-2.0` \ `pkg-config --cflags --libs libglade-2.0`
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Caution If you want to automatically connect signals in the main executable or any nonshared library,
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you will have to pass -export-dynamic to the linker. Otherwise, none of the signals will be able to be connected because GModule will not be able to open the application for introspection!
Loading a User Interface
Loading a Glade user interface is done with glade_xml_new(). This is the first GladeXML function you should call, although it should be called after gtk_init(). It parses the user interface provided by the XML file, creates all of the necessary widgets, and provides facilities for translation. GladeXML* glade_xml_new (const char *glade_file_name, const char *root_widget, const char *translation_domain); This function accepts three strings. The first is the location of the Glade user interface file. This path can be either relative or absolute, although you will usually want to use an absolute path since the executable could be installed in an alternative location on the user s system. This absolute path is usually defined by applications such as GNU Autotools during compilation. The relative path is with respect to the current working directory, which is initially set to the location of the executable but can be changed with g_chdir(). The second parameter accepted by glade_xml_new() is the widget name of the root node. You can specify a widget name so that only GladeXML loads a certain widget and its children. Passing NULL to this parameter will cause GladeXML to load every widget in the file.
Note Every call to glade_xml_new() will build a new version of the user interface. Because of this, it is
necessary to call this function only once for a single UI unless you destroy the widgets at some point in the application.
Lastly, you can provide a translation domain for the widgets, which will handle any widgets marked as translatable accordingly. If your application does not provide translations, it is safe to provide NULL to this parameter.
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