OrientationResizeHandler.java

package kornell.gui.client.util.orientation;

import com.google.gwt.event.logical.shared.ResizeEvent;
import com.google.gwt.event.logical.shared.ResizeHandler;
import com.google.web.bindery.event.shared.EventBus;

public final class OrientationResizeHandler implements ResizeHandler {

	private static final OrientationChangeEvent LANDSCAPE_EVENT = new OrientationChangeEvent(Orientation.LANDSCAPE);

	private static final OrientationChangeEvent PORTRAIT_EVENT = new OrientationChangeEvent(Orientation.PORTRAIT);

	private Orientation orientation;
	
	private EventBus bus;
	
	public OrientationResizeHandler(EventBus bus){
		this.bus = bus;
	}

	@Override
	public void onResize(final ResizeEvent event) {
		final Orientation o = event.getWidth() > event.getHeight() ? Orientation.LANDSCAPE : Orientation.PORTRAIT;
		if (orientation != o) {
			bus.fireEvent(o == Orientation.PORTRAIT ? PORTRAIT_EVENT : LANDSCAPE_EVENT);
			orientation = o;
		}
	}

}