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The libraries usually used are listed in Table 5. Table 5: Commonly: Used GTK Libraries Description GTK widget library Xlib wrapper Runtime extensions GTK is built on top of Glib and always requires it Used by GDK Shared memory pixmaps and other X extensions Math library
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Library GTK (-lgtk) GDK (-lgdk) gmodule (-lgmodule) Glib (-lglib) Xlib (-lX11) Xext (-lXext) math (-lm)
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The program language types used in GTK+ programming can be categorized into fundamental, built-in, and object types. The fundamental types are basic types, such as standard C program types and the base class types for GTK+, like GTK_TYPE_OBJECT. The fundamental types are automatically defined by gtk_init. The built-in types include some basic enumerations, flags, and structures like GdkWindow these are types that GTK+ need not understand to use. Object types consist of registered GtkObject types.
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Signal and Events
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Gnome programming works like other GUI programming it is event oriented. In eventdriven programs, you first define the objects that the user can operate on, and then you start the interaction function that continually checks for certain events, such as mouse clicks and menu selections. When such an event is detected, it is passed to its appropriate function for
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handling. For example, if a user clicks on an OK button, the mouse click is detected and control is passed to a function set up to handle a click on an OK button. When the function is finished, it returns control back to the interaction program. GTK adds a further level of sophistication. When events occur on a certain widget, the widget will emit a signal that is then used to execute a function associated both with that signal and that object. For example, when you click on a Close button, the Close button widget detects the mouse-click event and emits a "clicked" signal. The signal is detected and its associated function is executed. You can also, if you wish, associate an event directly with a function. For this to work, the programmer has to connect a signal on a given object with a particular function. Functions associated with a particular signal are commonly referred to as "handlers" or "callbacks." When a signal is emitted, its handlers or callbacks are invoked. This process is referred to as "emission." Note that the signals referred to here are in no way like the signals used in Unix systems. To associate a particular event with the function you want executed for a given signal, you use either the gtk_signal_connect or gtk_signal_connect_object functions. When the signal is detected, its associated function is automatically executed. The gtk_signal_connect function is used for calling functions to which you may be passing arguments, and either gtk_signal_connect or gtk_signal_connect_object is used for calling functions that require no arguments. In the following gtk_signal_connect syntax statement, the object is the GtkObject you defined, such as a button. The name is the name of the signal, such as a mouse click; func is the function you want executed whenever an event for this object occurs; and func_data are any arguments being passed to that function.
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gint gtk_signal_connect( GtkObject *object, gchar *name, GtkSignalFunc func, gpointer func_data );
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When a signal is detected for the specified object, its associated callback function is called and executed, as shown in this syntax statement:
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void callback_func( GtkWidget *widget, gpointer callback_data );
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Therefore, to associate a click on a button with the hello function, you would use the following gtk_signal_connect statement:
gtk_signal_connect (GTK_OBJECT (mybutton), "clicked", GTK_SIGNAL_FUNC (hello), NULL);
The object is mybutton, clicked is the click signal, and hello is a function the programmer wrote to be executed when this signal is detected. GTK_OBJECT and GTK_SIGNAL_FUNC are macros that perform type checking and casting to make sure the objects are passed with the appropriate types. Certain objects have signals that can be associated with them. For example, the button object can be associated with a clicked signal or an enter signal. The clicked signal occurs when a user presses down and then releases the mouse button, whereas an enter signal occurs when the user moves the mouse pointer over the button object. The button signals are the following:
pressed Mouse button pressed down when pointer positioned on the button released Mouse button released when pointer positioned on the button clicked Mouse button pressed down and released when pointer positioned on the button enter Mouse pointer is moved onto the button leave Mouse pointer is moved out of the button
You can also use the signal connection functions to connect events directly to an object and function, instead of using signals. Events are messages transmitted by the X11 server to indicate occurrences like mouse clicks and menu selections. In the gtk_signal_connect function, you use the name of the event instead of the signal. Callback functions for events include an added argument for the event. The type for this parameter can be GdkEvent or one of several other event types. These are listed in Table 6.
void callback_func( GtkWidget *widget, GdkEvent *event, gpointer callback_data );
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