Monkey patching in Seed

monkeypatch.js

Seed.import_namespace("Gtk");

Gtk.init(null, null);

Gtk.Container.prototype.clear = function() {
  var container = this;
  container.foreach(function(i) {container.remove(i)});
}

Gtk.Container.prototype._add = Gtk.Container.prototype.add;
Gtk.Container.prototype.add = function(obj) {
  Seed.print("Adding an object to " + this);
  this._add(obj);
}

var win = new Gtk.Window({title: "Monkey patch test"});
win.signal.hide.connect(Gtk.main_quit);

var vb = new Gtk.VBox({spacing: 5});
var frame = new Gtk.Frame();
var btn = new Gtk.Button({label: "Click Me!"});

btn.signal.clicked.connect(function(w) {vb.clear()});

frame.add(btn);
vb.pack_start(frame);
win.add(vb);

win.show_all();
Gtk.main();