/** canvascall.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);
static gint rectangleEvent(GnomeCanvasItem *item,
        GdkEvent *event,gpointer data);
void describeEventButton(gchar *name,GdkEvent *event);
void describeEventMotion(gchar *name,GdkEvent *event);
void describeEventCrossing(gchar *name,GdkEvent *event);

#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("canvascall","1.0",argc,argv);
    app = gnome_app_new("canvascall",
            "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_ellipse_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_rect_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);
    gtk_signal_connect(GTK_OBJECT(item),"event",
                (GtkSignalFunc)rectangleEvent,NULL);

    item = gnome_canvas_item_new(rootGroup,
                      gnome_canvas_ellipse_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_BUTTON_PRESS)
        gnome_canvas_item_raise_to_top(item);
    return(0);
}
static gint rectangleEvent(GnomeCanvasItem *item,
        GdkEvent *event,gpointer data) {
    switch(event->any.type) {
    case GDK_ENTER_NOTIFY:
        describeEventCrossing("GDK_ENTER_NOTIFY",event);
        break;
    case GDK_LEAVE_NOTIFY:
        describeEventCrossing("GDK_LEAVE_NOTIFY",event);
        break;
    case GDK_MOTION_NOTIFY:
        describeEventMotion("GDK_MOTION_NOTIFY",event);
        break;
    case GDK_BUTTON_PRESS:
        describeEventButton("GDK_BUTTON_PRESS",event);
        break;
    case GDK_2BUTTON_PRESS:
        describeEventButton("GDK_2BUTTON_PRESS",event);
        break;
    case GDK_3BUTTON_PRESS:
        describeEventButton("GDK_3BUTTON_PRESS",event);
        break;
    case GDK_BUTTON_RELEASE:
        describeEventButton("GDK_BUTTON_RELEASE",event);
        break;
    default:
        g_print("An unexpected event......\n");
        break;
    }
    g_print("    GdkEvent #%d",event->type);
    if(event->any.send_event)
        g_print(" (from another client,");
    else
        g_print(" (from server,");
    if(event->any.window != NULL) {
        if(data == NULL)
            g_print(" with no data)\n");
        else
            g_print(" with data %p)\n",data);
    }
    return(0);
}
void describeEventButton(gchar *name,GdkEvent *event)
{
    g_print("%s -- GdkEventButton\n",name);
    g_print("    x=%g y=%g xtilt=%g ytilt=%g"
                    " pressure=%g button=%d\n",
            event->button.x,event->button.y,
            event->button.xtilt,event->button.ytilt,
            event->button.pressure,event->button.button);
    g_print("    x_root=%g y_root=%g  time=%u"
                    " state=0x%08X\n",
            event->button.x_root,event->button.y_root,
            event->button.time,event->button.state);
}
void describeEventMotion(gchar *name,GdkEvent *event)
{
    g_print("%s --  GdkEventMotion\n",name);
    g_print("    x=%g y=%g xtilt=%g ytilt=%g"
                    " pressure=%g is_hint=%s\n",
            event->motion.x,event->motion.y,
            event->motion.xtilt,event->motion.ytilt,
            event->motion.pressure,
            event->motion.is_hint ? "TRUE" : "FALSE");
    g_print("    x_root=%g y_root=%g  time=%u"
                    " state=0x%08X\n",
            event->motion.x_root,event->motion.y_root,
            event->motion.time,event->motion.state);
}
void describeEventCrossing(gchar *name,GdkEvent *event)
{
    gchar *mode =
     event->crossing.mode == GDK_CROSSING_NORMAL
     ? "Normal" : event->crossing.mode == GDK_CROSSING_GRAB
     ? "Grab" : "Ungrab";

    g_print("%s --  GdkEventCrossing\n",name);
    g_print("    x=%g y=%g x_root=%g y_root=%g focus=%s\n",
            event->crossing.x,event->crossing.y,
            event->crossing.x_root,event->crossing.y_root,
            event->crossing.focus ? "TRUE" : "FALSE");
    g_print("    mode=%s time=%u detail=%d state=0x%08X\n",
            mode,event->crossing.time,
            event->crossing.detail,event->crossing.state);
}
gint eventDelete(GtkWidget *widget,
        GdkEvent *event,gpointer data) {
    return(FALSE);
}
gint eventDestroy(GtkWidget *widget,
        GdkEvent *event,gpointer data) {
    gtk_main_quit();
    return(0);
}