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Table 6: Commonly: Used GTK Events GtkWidget Signal "delete_event" "destroy_event" "expose_event" "motion_notify_event" "button_press_event" "button_press_event" "button_press_event" "button_release_event" "key_press_event" "key_release_event" "focus_in_event", "focus_out_event" "selection_clear_event" "selection_request_event"
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GDK_MOTION_NOTIFY GDK_BUTTON_PRESS GDK_2BUTTON_PRESS GDK_3BUTTON_PRESS GDK_BUTTON_RELEASE GDK_KEY_PRESS GDK_KEY_RELEASE GDK_FOCUS_CHANGE GDK_SELECTION_CLEAR GDK_SELECTION_REQUEST
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For example, to associate a button_press_event with an OK button, you would use "button_press_event" as the signal name. The following example associates a button_press_event event on a button with the button_press_callback function:
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gtk_signal_connect( GTK_OBJECT(button), "button_press_event", GTK_SIGNAL_FUNC(button_press_callback), NULL);
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The callback function used for the signal connection, in this case button_press_callback, would have the event type GdkEventButton for its event argument.
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static gint button_press_callback( GtkWidget *widget, GdkEventButton *event, gpointer data );
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The following example associates a click on a window Close box with the close-win function. The object is mywindow, delete_event is the Close-box event, and close-win is a function the programmer wrote with code to be executed when this event occurs. When a user clicks on the window's Close box, the close-win function is called.
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gtk_signal_connect (GTK_OBJECT (mywindow), "delete_event", GTK_SIGNAL_FUNC (close-win), NULL);
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Signals are stored in a global table. You can create your own signals with the gtk_signal_new function, and then use gtk_signal_emit to have an object emit a signal. gtk_signal_new will return an identifier for the new signal. You can use this with gtk_signal_emit to have your object emit that signal.
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Gnome Functions
Gnome programs build on GTK+ programs providing Gnome functions to let you more easily create Gnome interfaces that are consistent with the style for the Gnome desktop. To create a simple GTK program, you begin with GTK object definitions for your Gnome widgets and then use Gnome functions to initialize your program and define your widgets. GTK functions such as gtk_signal_connect are used to associate GUI events with objects, whereas Gnome functions such as gnome_app_create_menus create menus. In a Gnome program you need to include an initialization function called gnome_init, which you place at the very beginning. To create a primary window for your application, you use gnome_app_new. The following example shows the use of the gnome_init and the gnome_app_new functions. The gnome_init function takes as its arguments any initial arguments that the user must enter when the program starts, as well as an application ID and version number. The user's initial arguments are managed by the argc and argv special variables. gnome_app_new takes as its arguments the title you want displayed in the application window and the name of the application object. It returns the address of the new object which, in this example, is assigned to the app pointer. app is a pointer to an object of type GtkWidget.
GtkWidget *app; gnome_init ("", "0.1", argc, argv); app = gnome_app_new ("Hello-World", "Hello App");
Other operations, such as displaying widgets and starting the interactive interface, are handled by GTK functions. gtk_widget_show_all will display a widget and any other widgets it contains. gtk_main will start the interactive operations, detecting GUI events such as mouse clicks and key presses and executing their associated functions.
gtk_widget_show_all(app); gtk_main ();
Compiling Gnome Programs
Given the extensive number of libraries involved in creating Gnome applications, the compiler command with all its listed libraries and flags can be very complex to construct. For this reason, Gnome provides the gnome-config script. You place a call to this script as an argument to the compiler operation instead of manually listing Gnome libraries and flags. gnome-config takes two options, -cflags and -libs. The -cflags option will generate all the
flags you need, and the -libs option generates the list of necessary Gnome libraries. You do need to specify the libraries you want to use, such as gnomeui and gnome, as shown here:
gnome-config --cflags -libs gnome gnomeui
For the compiler operation, you would place the gnome-config operation in back quotes to execute it:
gcc myprog.c o myprog 'gnome-config - cflags - libs gnome gnomeui'
To simplify matters, you can place this operation in a Makefile. In a Makefile, the compiling is performed separately from the linking. For compiling, you would use a gnome-config script with the -cflags option, and for linking you would use the -libs option. In the following example, the CFLAGS and LDFLAGS macros are used to hold the compiling and linking results, respectively. Notice the use of back quotes in the code.
makefile CFLAGS='gnome-config --cflags gnome gnomeui' LDFLAGS='gnome-config --libs gnome gnomeui' all: bookrec bookrec: file.o calc.o cc $(LDFLAGS) main.o o bookrec main.o: main.c cc $(CFLAGS) main.c file.o: file.c file.h cc $(CFLAGS) file.c
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