/* * * 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 <gtk/gtk.h>#include <stdio.h>#include <stdlib.h>static voidHandleOkButton(GtkWidget *w, gpointer data){  GtkAdjustment *adj = (GtkAdjustment *) data;  char buf[128];  gfloat lower, upper;  printf( "Enter lower: " );  fgets( buf, sizeof( buf ), stdin );  lower = atof( buf );  printf( "Enter upper: " );  fgets( buf, sizeof( buf ), stdin);  upper = atof( buf );  gtk_adjustment_clamp_page( adj, lower, upper );}// called when the user changes the value of the first scale widgetstatic voidAdjustmentChanged(GtkAdjustment *w, gpointer data){  fprintf( stderr, "Adjustment is %.1f\n", w->value );}main( argc, argv )int argc;char *argv[];{  GtkWidget *hscale, *vscale, *vbox, *hbox, *window, *button;  GtkObject *adj;  gtk_init( &argc, &argv );  window = gtk_window_new(GTK_WINDOW_TOPLEVEL);  gtk_window_position(GTK_WINDOW(window), GTK_WIN_POS_MOUSE);  gtk_signal_connect(GTK_OBJECT(window), "destroy",    GTK_SIGNAL_FUNC(gtk_widget_destroyed), &window);  gtk_window_set_title(GTK_WINDOW (window), "GtkScale Demo");  vbox = gtk_vbox_new( FALSE, 0 );  gtk_container_add( GTK_CONTAINER( window ), vbox );  hbox = gtk_hbox_new( FALSE, 0 );	gtk_box_pack_start( GTK_BOX( vbox ), hbox, TRUE, TRUE, 0 );  // create an adjustment object for the first scale widget  adj = gtk_adjustment_new(30.0, 25.0, 75.0, 1.0, 5.0, 10.0);  gtk_signal_connect(GTK_OBJECT(adj), "value_changed",    GTK_SIGNAL_FUNC(AdjustmentChanged), NULL);  // create a horizontal scale widget. Display the value to the  // left of the scale, and display scale value as an integer  hscale = gtk_hscale_new( GTK_ADJUSTMENT(adj) );  gtk_scale_set_value_pos( GTK_SCALE(hscale), GTK_POS_LEFT );  gtk_scale_set_digits( GTK_SCALE(hscale), 0 );  gtk_box_pack_start( GTK_BOX( hbox ), hscale, TRUE, TRUE, 0 );  // create a vertical scale widget using widget-supplied defaults  vscale = gtk_vscale_new( GTK_ADJUSTMENT(adj) );  gtk_box_pack_start( GTK_BOX( hbox ), vscale, TRUE, TRUE, 0 );  button = gtk_button_new_with_label( "Ok" );  gtk_signal_connect(GTK_OBJECT(button), "clicked",    (GtkSignalFunc) HandleOkButton, adj);  gtk_box_pack_end( GTK_BOX( vbox ), button, FALSE, FALSE, 0 );  gtk_widget_show_all( GTK_WIDGET( window ) );          gtk_main();}