import java.util.List;

/**

 * Block spinning the event loop until {@link BlockCondition#isBlocked()}

 * return false

 * 

 * @param block

 *            the block condition

 */

public void block(BlockCondition block) {

	checkDevice();

	if( ! block.isBlocked() ) {

		return;

	}

	while (block.isBlocked()) {

		if (!readAndDispatch()) {

			sleep();

		}

	}

}

public static class BlockCondition {

	private boolean blocked = true;

	private List listenerList = new ArrayList();

	public void addListener(Runnable r) {

		listenerList.add(r);

	}

	public void removeListener(Runnable r) {

		listenerList.remove(r);

	}

	public boolean isBlocked() {

		return blocked;

	}

	public void unblock() {

		blocked = false;

		Object[] listeners = listenerList.toArray();

		for( int i = 0; i < listeners.length; i++ ) {

			((Runnable)listeners[i]).run();

		}

	}

}

import org.eclipse.swt.widgets.Display.BlockCondition;

/**

 * Open the shell and block until it is closed

 */

public void openBlocking() {

	final BlockCondition c = new BlockCondition();

	addDisposeListener(new DisposeListener() {

		public void widgetDisposed(DisposeEvent e) {

			c.unblock();

		}

	});

	open();

	getDisplay().block(c);

}