package invisible;

import org.gnu.gtk.Button;
import org.gnu.gtk.Gtk;
import org.gnu.gtk.HBox;
import org.gnu.gtk.Invisible;
import org.gnu.gtk.Window;
import org.gnu.gtk.WindowType;
import org.gnu.gtk.event.LifeCycleEvent;
import org.gnu.gtk.event.LifeCycleListener;

public class InvisibleExample {

    public InvisibleExample() {

	Window window = new Window(WindowType.TOPLEVEL);
	window.setTitle("Invisible Example");
	window.addListener(new LifeCycleListener() {
		public void lifeCycleEvent(LifeCycleEvent event) {}
		public boolean lifeCycleQuery(LifeCycleEvent event) {
			if (event.isOfType(LifeCycleEvent.Type.DESTROY) || 
					event.isOfType(LifeCycleEvent.Type.DELETE)) {
					Gtk.mainQuit();
			}
			return false;
		}
	});

	HBox box = new HBox(false, 0);

	Button button = new Button("Left Button", true);
	box.packStart(button, false, false, 0);

	// The Invisible widget displays a blank window.
	// It is a very useful but often forgotten widget
	// that can be used very effectively as a placeholder
	// or spacer to assist in the layout of widgets.  You
	// can size the widget using the setSizeRequest() method.  Our
	// buttons will have a height of 60 pixels and there
	// will be a space of 30 pixels between them.
	Invisible invisible = new Invisible();
	invisible.setMinimumSize(30, 60);
	box.packStart(invisible, false, false, 0);

	button = new Button("Right Button", true);
	box.packStart(button, false, false, 0);

	window.add(box);

	window.showAll();
    }

    public static void main(String[] args) {
	// Initialize GTK 
	Gtk.init(args);

	InvisibleExample inv = new InvisibleExample();

	Gtk.main();
    }
}