GdkEventButton handler

[Carlos Pereira <carlos pehoe civil ist utl pt>]

> Can you get more info from a "clicked" signal ? As in, what button clicked it ?

This is a working example showing a button widget which is able to distinguish
between mouse buttons 1, 2 and 3, and which looks the same when mouse button 1, 2 
or 3 is pressed. It also recognizes double and triple clicks on the three buttons.
I tried to concentrate only in the essential aspects, so no additional routines are 
included (to close the window, for example).

Carlos Pereira,
Technical University of Lisboa,
Portugal

---------------------------button.c-------------------------------
#include <gtk/gtk.h>

/* see gtk/include/gdk/gdktypes.h for GdkEventButton type */

gint signal_handler_event (GtkWidget *widget, GdkEventButton *event)
{
printf ("button %d ", event->button);

switch (event->type) 
  {
  case (4): printf ("pressed! (Come on... you can be faster than that...\n"); 
            /* to force buttons 2, 3 to go down */
            gtk_button_pressed (GTK_BUTTON (widget));
            break;
  case (5): printf ("double clicked! (Much better! You are improving...)\n");
            break;
  case (6): printf ("triple clicked! (Uau! that is really fast!)\n");
            break;
  case (7): printf ("released!\n");
            /* to force buttons 2, 3 to come up */
            gtk_button_released (GTK_BUTTON (widget));
  }
}

int main (int argc, char **argv)
{
GtkWidget *window;
GtkWidget *button;

gtk_init (&argc, &argv);
window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
button = gtk_button_new_with_label ("GTK Rocks!");
gtk_container_add (GTK_CONTAINER (window), button);
gtk_widget_show (button);
gtk_widget_show (window);

gtk_signal_connect (GTK_OBJECT(button), "button_press_event",
                    GTK_SIGNAL_FUNC(signal_handler_event), NULL);

gtk_signal_connect(GTK_OBJECT(button), "button_release_event",
                   GTK_SIGNAL_FUNC(signal_handler_event), NULL);
gtk_main ();
}
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