/* * * 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>// an appointment book entrytypedef struct _calentry {  int day;		// day of the month  char *timestr;		// time of the appointment  char *title;		// appointment title  char *location;		// appointment location} CalEntry;// Appointment book (only 1 month of data here, all hardcoded, for // simplicity sake static CalEntry entries[] = {  { 3, "11:30 AM", "Lunch with Bob", "Joe's Grill"},  { 6, "5:00 PM", "Pick up Sally at airport", "Airport" },  { 7, "3:40 PM", "Dentist", "Dr. Jones"},  { 14, "6:15 PM", "Dinner with team", "TBD"},  { 17, "9:00 AM", "Golf", "Torrey Pines, North Course"},  { 18, "1:00 PM", "Sally's flight home", "Airport" },  { 19, "11:30 AM", "Phone roofer", "N/A"},  { 22, "7:30 PM", "Take cousin to movies", "City Theatre" }};// format and display a message in a modal dialogvoidDisplayMessage( char *title, char *location, char *timestr ){  char buf[1024];  GtkWidget *dialog, *label, *button;	  sprintf( buf, "%s\n Time: %s Location: %s", title, timestr, location );  dialog = gtk_dialog_new();  gtk_window_position(GTK_WINDOW (dialog), GTK_WIN_POS_MOUSE);  gtk_window_set_modal(GTK_WINDOW (dialog), TRUE);  label = gtk_label_new( buf );  gtk_box_pack_start(GTK_BOX (GTK_DIALOG (dialog)->vbox),     label, TRUE, TRUE, 0);  button = gtk_button_new_with_label ("Ok");  gtk_signal_connect_object(GTK_OBJECT (button), "clicked",    GTK_SIGNAL_FUNC(gtk_widget_destroy), GTK_OBJECT(dialog));  gtk_box_pack_start(GTK_BOX (GTK_DIALOG (dialog)->action_area),    button, FALSE, FALSE, 0);  gtk_widget_show_all( dialog );}// GtkCalendar day_selected signal function. See if the selected day is in// the appointment book and, if so, display it in a dialog voidSelectDay (GtkWidget *widget, gpointer data){  guint year, month, day;  int i;  // retrieve the selected date  gtk_calendar_get_date(GTK_CALENDAR(widget), &year, &month, &day);  // see if it exists in the appointment book, and if it does  // display the entry  for ( i = 0; i < sizeof( entries ) / sizeof( CalEntry ); i++ )    if ( entries[i].day == day )       DisplayMessage( entries[i].title,         entries[i].location, entries[i].timestr );}main( int argc, char *argv[] ){  GtkWidget *button, *calendar, *dialog;  GtkCalendarDisplayOptions flags;  int i;  gtk_init( &argc, &argv );	dialog = gtk_dialog_new();  gtk_window_position(GTK_WINDOW (dialog), GTK_WIN_POS_MOUSE);  // create the calendar widget  calendar = gtk_calendar_new();  // retrieve the default flags  flags = GTK_CALENDAR( calendar )->display_flags;  // turn off the ability to change the date#if 1  gtk_calendar_display_options( GTK_CALENDAR( calendar ),    flags | GTK_CALENDAR_NO_MONTH_CHANGE );#endif  // handle a mouse button 1 press over a day in the calendar  gtk_signal_connect (GTK_OBJECT (calendar), "day_selected",    GTK_SIGNAL_FUNC (SelectDay), NULL);  // mark all days that have an entry in the appointment book  for ( i = 0; i < sizeof( entries ) / sizeof( CalEntry ); i++ )    gtk_calendar_mark_day( GTK_CALENDAR(calendar), entries[i].day );  gtk_box_pack_start(GTK_BOX (GTK_DIALOG (dialog)->vbox),     calendar, TRUE, TRUE, 0);  button = gtk_button_new_with_label ("Quit");  gtk_signal_connect_object(GTK_OBJECT (button), "clicked",    GTK_SIGNAL_FUNC(gtk_widget_destroy), GTK_OBJECT(dialog));  gtk_box_pack_start(GTK_BOX (GTK_DIALOG (dialog)->action_area),    button, FALSE, FALSE, 0);  gtk_widget_show_all(dialog);  gtk_main();}