#include <gtk/gtk.h>

static void
switch_images(GtkWidget *button)
{
    GtkWidget *image1, *image2;

    image1 = gtk_button_get_image(GTK_BUTTON(button));
    image2 = g_object_get_data(G_OBJECT(button), "other-image");
    g_print("Current image: %s, switching to %s\n",
            (const gchar*)g_object_get_data(G_OBJECT(image1), "id"),
            (const gchar*)g_object_get_data(G_OBJECT(image2), "id"));
    gtk_button_set_image(GTK_BUTTON(button), image2);
    g_object_set_data(G_OBJECT(button), "other-image", image1);
    g_print("New image realized: %d, mapped: %d, visible: %d\n",
            GTK_WIDGET_REALIZED(image2),
            GTK_WIDGET_MAPPED(image2),
            GTK_WIDGET_VISIBLE(image2));
}

int
main(int argc, char *argv[])
{
    GtkWidget *window, *target, *switcher, *vbox, *image1, *image2;

    gtk_init(&argc, &argv);
    window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
    g_signal_connect(window, "destroy", G_CALLBACK(gtk_main_quit), NULL);

    vbox = gtk_vbox_new(FALSE, 0);
    gtk_container_add(GTK_CONTAINER(window), vbox);

    image1 = gtk_image_new_from_stock(GTK_STOCK_YES, GTK_ICON_SIZE_BUTTON);
    g_object_set_data(G_OBJECT(image1), "id", "Yes");
    g_object_ref(image1);

    image2 = gtk_image_new_from_stock(GTK_STOCK_NO, GTK_ICON_SIZE_BUTTON);
    g_object_set_data(G_OBJECT(image2), "id", "No");
    g_object_ref(image2);

    target = gtk_button_new_with_label("Target");
    gtk_button_set_image(GTK_BUTTON(target), image1);
    g_object_set_data(G_OBJECT(target), "other-image", image2);
    gtk_box_pack_start(GTK_BOX(vbox), target, FALSE, FALSE, 0);

    switcher = gtk_button_new_with_label("Switch");
    gtk_box_pack_start(GTK_BOX(vbox), switcher, FALSE, FALSE, 0);
    g_signal_connect_swapped(switcher, "clicked",
                             G_CALLBACK(switch_images), target);

    gtk_widget_show_all(window);
    gtk_main();

    return 0;
}