/* * * Sample Code for Gtk+ Programming in C, 1st Edition, Prentice Hall * * Copyright 2000 - 2002 Syd Logan, All Rights Reserved * * This code is distributed without warranty. You are free to use this * code for any purpose, however, if this code is republished or * redistributed in its original form, as hardcopy or electronically, * then you must include this copyright notice along with the code. * * Questions or comments regarding this code or any bugs it contains can * be directed to the author via e-mail at slogan@cts.com **/#include <stdio.h>#include <time.h>#include <gtk/gtk.h>#include <unistd.h>#include <signal.h>static GtkWidget *drawing;voidAlarmFunc( int foo ){	GdkEvent event;	gint retval;	gtk_signal_emit( GTK_OBJECT(drawing), 		gtk_signal_lookup( "motion_notify_event", 		GTK_OBJECT_TYPE(drawing) ), &event, &retval );	alarm(1L);}static voidmotion_notify_callback( GtkWidget *widget, GdkEventMotion *event, char *arg ){	static int count = 1;	fprintf( stderr, "In motion_notify_callback %s %03d\n", arg, count++ );	fflush( stderr );}voidExit (GtkWidget *widget, gpointer arg){	gtk_main_quit ();}intmain( int argc, char *argv[] ){	GtkWidget *window, *box;	struct sigaction old, act; 	gtk_set_locale (); 	gtk_init (&argc, &argv);	window = gtk_window_new (GTK_WINDOW_TOPLEVEL); 	gtk_signal_connect (GTK_OBJECT(window), "destroy", 		GTK_SIGNAL_FUNC(Exit), NULL); 	gtk_window_set_title (GTK_WINDOW (window), "Events 3"); 	gtk_container_border_width (GTK_CONTAINER (window), 0); 	box = gtk_vbox_new (FALSE, 0); 	gtk_container_add (GTK_CONTAINER (window), box); 	drawing = gtk_drawing_area_new ();	gtk_widget_set_events (drawing, GDK_EXPOSURE_MASK|GDK_POINTER_MOTION_MASK);  gtk_signal_connect( GTK_OBJECT(drawing), "motion_notify_event",    GTK_SIGNAL_FUNC(motion_notify_callback), "Hello World" );  gtk_box_pack_start (GTK_BOX (box), drawing, TRUE, TRUE, 0);	gtk_widget_show_all (window);	act.sa_handler = AlarmFunc;	act.sa_flags = 0;		sigaction( SIGALRM, &act, &old );	alarm( 1L );	gtk_main ();  sigaction( SIGALRM, &old, NULL );	return( 0 );}