Java-GNOME 2.10 GNOME Tutorial
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# Containers

There are widgets in GTK and GNOME whose sole purpose is to contain other widgets. This chapter will discuss a few of these widgets.

# Alignment

The Alignment container is designed to hold a single widget and control the widgets size and position. The widget is positioned in the container a certain percentage of the distance from the top and left sides of the container. The widget is sized a certain percentage of the containers height and width. Let's look at a small example to demonstrate it usage.

Example 1. Alignment.java - Alignment

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

    public class AlignmentExample {

    	public AlignmentExample() {

    		Window window = new Window(WindowType.TOPLEVEL);
    		window.setTitle("Alignment Example");
    		window.addListener(new LifeCycleListener() {
    			public void lifeCycleEvent(LifeCycleEvent event) {}
    			public boolean lifeCycleQuery(LifeCycleEvent event) {
    				Gtk.mainQuit();
    				return false;
    			}
    		});
    		window.setDefaultSize(100, 100);

    		Button button = new Button("The Button Label", false);
    		// We will create an Alignment and add the button to it.
    		// The x alignment is set to 1.0, which keeps the button
    		// against the right edge.  The y alignment is 0.5, keeping
    		// the widget vertically centered.  The scale value is set
    		// to 0.15 in both directions, which limits the expansion
    		// of the button to no more than 15 percent of the area
    		// made available to it.
    		Alignment alignment = new Alignment(1.0, 0.5, 0.15, 0.15);
    		alignment.add(button);
    		window.add(alignment);

    		window.showAll();
    	}

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

    		AlignmentExample align = new AlignmentExample();

    		Gtk.main();
    	}
    }

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Using Layout Managers |  | Frame