# File gtk/sample/testgtk/shapedwindow.rb, line 19
  def initialize(xpm_file, x, y, px, py, type)
    super(type)
    @destroyed = false
    signal_connect("destroy"){destroy}

    realize

    @@root_win = Gdk::Window.default_root_window unless @@root_win

    window.set_events(window.events | Gdk::Event::BUTTON_MOTION_MASK |
               Gdk::Event::POINTER_MOTION_HINT_MASK |
               Gdk::Event::BUTTON_PRESS_MASK)

    signal_connect("button_press_event") do |w, event|
      if (event.event_type == Gdk::Event::BUTTON_PRESS)
        @x = event.x
        @y = event.y
        Gtk.grab_add(self)
        Gdk.pointer_grab(window, true,
                            Gdk::Event::BUTTON_RELEASE_MASK |
                            Gdk::Event::BUTTON_MOTION_MASK |
                            Gdk::Event::POINTER_MOTION_HINT_MASK,
                            nil, nil, 0)
      end
    end
    signal_connect("button_release_event") do
      Gtk.grab_remove(self)
      Gdk.pointer_ungrab(0)
    end
    signal_connect("motion_notify_event") do
      xp, yp, mask = @@root_win.pointer
      move(xp  - @x, yp  - @y)
    end

    move(x, y)

    style = Gtk::Widget.default_style

    fixed = Gtk::Fixed.new
    fixed.set_size_request(100, 100)
    add(fixed)

    gdk_pixmap, gdk_pixmap_mask =
      Gdk::Pixmap::create_from_xpm(window,
                                   style.bg(Gtk::STATE_NORMAL),
                                   xpm_file)
    pixmap = Gtk::Image.new(gdk_pixmap, gdk_pixmap_mask)

    fixed.put(pixmap, px, py)

    shape_combine_mask(gdk_pixmap_mask, px, py)
  end