/* * * 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>// a data type that makes it possible to pass both adjustment objects as// client data to the HandleOkButton() signal functiontypedef struct _adjustments {  GtkAdjustment *adj1;  GtkAdjustment *adj2;} Adjustments;// called when the user presses the Ok buttonstatic voidHandleOkButton(GtkWidget *w, gpointer data){  Adjustments *adjs = (Adjustments *) data;  fprintf( stderr, "Hscale value is %d vscale value is %.1f\n",    (int) adjs->adj1->value, adjs->adj2->value );}// called when the user changes the value of the first scale widgetstatic voidAdjustment1Changed(GtkAdjustment *w, gpointer data){  fprintf( stderr, "Adjustment 1 is %d\n", (int) w->value );}// called when the user changes the value of the second scale widgetstatic voidAdjustment2Changed(GtkAdjustment *w, gpointer data){  fprintf( stderr, "Adjustment 2 is %.1f\n", w->value );}main( argc, argv )int argc;char *argv[];{  GtkWidget *hscale, *vscale, *vbox, *hbox, *window, *button;  GtkObject *adj1, *adj2;  Adjustments adjustments;  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  adj1 = gtk_adjustment_new(0.0, 0.0, 100.0, 1.0, 5.0, 1.0);  gtk_signal_connect(GTK_OBJECT(adj1), "value_changed",    GTK_SIGNAL_FUNC(Adjustment1Changed), 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(adj1) );  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 an adjustment object for the second scale widget          adj2 = gtk_adjustment_new(0.0, 0.0, 100.0, 1.0, 5.0, 50.0);  gtk_signal_connect(GTK_OBJECT(adj2), "value_changed",    GTK_SIGNAL_FUNC(Adjustment2Changed), NULL);  // create a vertical scale widget using widget-supplied defaults  vscale = gtk_vscale_new( GTK_ADJUSTMENT(adj2) );  gtk_box_pack_start( GTK_BOX( hbox ), vscale, TRUE, TRUE, 0 );  adjustments.adj1 = GTK_ADJUSTMENT(adj1);  adjustments.adj2 = GTK_ADJUSTMENT(adj2);#if 0  button = gtk_button_new_with_label( "Ok" );  gtk_signal_connect(GTK_OBJECT(button), "clicked",    (GtkSignalFunc) HandleOkButton, &adjustments);  gtk_box_pack_end( GTK_BOX( vbox ), button, FALSE, FALSE, 0 );#endif  gtk_widget_show_all( GTK_WIDGET( window ) );          gtk_main();}