/** canvasorder.c **/
#include <gnome.h>

gint eventDelete(GtkWidget *widget,
        GdkEvent *event,gpointer data);
gint eventDestroy(GtkWidget *widget,
        GdkEvent *event,gpointer data);
static gint itemEvent(GnomeCanvasItem *item,
        GdkEvent *event,gpointer data);

#define HORIZ 100
#define VERT 60
#define WIDTH (HORIZ * 6)
#define HEIGHT (VERT * 6)

int main(int argc,char *argv[])
{
    GtkWidget *app;
    GtkWidget *canvas;
    GnomeCanvasGroup *rootGroup;
    GnomeCanvasItem *item;

    gnome_init("canvasorder","1.0",argc,argv);
    app = gnome_app_new("canvasorder",
            "Gnome Canvas Order");
    gtk_signal_connect(GTK_OBJECT(app),"delete_event",
            GTK_SIGNAL_FUNC(eventDelete),NULL);
    gtk_signal_connect(GTK_OBJECT(app),"destroy",
            GTK_SIGNAL_FUNC(eventDestroy),NULL);

    canvas = gnome_canvas_new();
    gtk_widget_set_usize(canvas,WIDTH,HEIGHT);
    gnome_canvas_set_scroll_region(GNOME_CANVAS(canvas),
            0.0,0.0,WIDTH,HEIGHT);
    rootGroup = gnome_canvas_root(GNOME_CANVAS(canvas));
    gnome_app_set_contents(GNOME_APP(app),canvas);

    item = gnome_canvas_item_new(rootGroup,
                      gnome_canvas_rect_get_type(),
                      "x1",(double)(HORIZ * 1),
                      "y1",(double)(VERT * 1),
                      "x2",(double)(HORIZ * 3),
                      "y2",(double)(VERT * 3),
                      "fill_color","white",
                      "outline_color","black",
                      NULL);
    gtk_signal_connect(GTK_OBJECT(item),"event",
                (GtkSignalFunc)itemEvent,NULL);

    item = gnome_canvas_item_new(rootGroup,
                      gnome_canvas_ellipse_get_type(),
                      "x1",(double)(HORIZ * 2),
                      "y1",(double)(VERT * 2),
                      "x2",(double)(HORIZ * 4),
                      "y2",(double)(VERT * 4),
                      "fill_color","blue",
                      "outline_color","black",
                      NULL);
    gtk_signal_connect(GTK_OBJECT(item),"event",
                (GtkSignalFunc)itemEvent,NULL);

    item = gnome_canvas_item_new(rootGroup,
                      gnome_canvas_rect_get_type(),
                      "x1",(double)(HORIZ * 3),
                      "y1",(double)(VERT * 3),
                      "x2",(double)(HORIZ * 5),
                      "y2",(double)(VERT * 5),
                      "fill_color","black",
                      "outline_color","white",
                      NULL);
    gtk_signal_connect(GTK_OBJECT(item),"event",
                (GtkSignalFunc)itemEvent,NULL);

    gtk_widget_show_all(app);
    gtk_main();
    exit(0);
}
static gint itemEvent(GnomeCanvasItem *item,
        GdkEvent *event,gpointer data) {
    if(event->type == GDK_ENTER_NOTIFY)
        gnome_canvas_item_raise_to_top(item);
    return(0);
}
gint eventDelete(GtkWidget *widget,
        GdkEvent *event,gpointer data) {
    return(FALSE);
}
gint eventDestroy(GtkWidget *widget,
        GdkEvent *event,gpointer data) {
    gtk_main_quit();
    return(0);
}