#include <gdk/gdkx.h>
#include <gtk/gtk.h>
#include <gtk/gtkx.h>

G_BEGIN_DECLS

#define GTK_TYPE_TRAY_ICON		(gtk_tray_icon_get_type ())
#define GTK_TRAY_ICON(obj)		(G_TYPE_CHECK_INSTANCE_CAST ((obj), GTK_TYPE_TRAY_ICON, MyTrayIcon))

typedef struct _MyTrayIcon	   MyTrayIcon;
typedef struct _MyTrayIconPrivate MyTrayIconPrivate;
typedef struct _MyTrayIconClass   MyTrayIconClass;

struct _MyTrayIcon
{
  GtkWindow parent_instance;

  MyTrayIconPrivate *priv;
};

struct _MyTrayIconClass
{
  GtkWindowClass parent_class;
};

G_END_DECLS

G_DEFINE_TYPE (MyTrayIcon, gtk_tray_icon, GTK_TYPE_WINDOW)

static gboolean
gtk_tray_icon_draw (GtkWidget *widget, 
		    cairo_t   *cr)
{
  gboolean retval = FALSE;

  /* Clear to transparent */
  cairo_set_source_rgba (cr, 0, 0, 0, 0);
  cairo_set_operator (cr, CAIRO_OPERATOR_SOURCE);
  cairo_paint (cr);

  if (GTK_WIDGET_CLASS (gtk_tray_icon_parent_class)->draw)
    retval = GTK_WIDGET_CLASS (gtk_tray_icon_parent_class)->draw (widget, cr);

  return retval;
}

static void
gtk_tray_icon_class_init (MyTrayIconClass *class)
{
  GtkWidgetClass *widget_class = (GtkWidgetClass *)class;
  widget_class->draw = gtk_tray_icon_draw;
}

static void
gtk_tray_icon_init (MyTrayIcon *icon)
{
  gtk_widget_set_app_paintable (GTK_WIDGET (icon), TRUE);
}

static gboolean timeout_cb(GtkWidget *window)
{
	gtk_widget_set_size_request(window, 100, 100);
	return FALSE;
}

int main(void)
{
	gtk_init(NULL, NULL);
	GtkWidget *image = gtk_image_new_from_stock(GTK_STOCK_OK, GTK_ICON_SIZE_LARGE_TOOLBAR);
	GtkWidget *tray = g_object_new (GTK_TYPE_TRAY_ICON, NULL);
	gtk_container_add(GTK_CONTAINER(tray), image);
	gtk_widget_show_all(tray);
	g_timeout_add(2000, timeout_cb, tray);

	gtk_main();
    return 0;
}