import org.eclipse.swt.SWT;
import org.eclipse.swt.events.PaintEvent;
import org.eclipse.swt.events.PaintListener;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.graphics.Rectangle;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Canvas;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Spinner;

public class FieldCue {
	public static void main(String[] args) {
		final Display display = new Display();
		Shell shell = new Shell(display);
		shell.setSize(250, 300);
		shell.setLayout(new GridLayout());
		
		Canvas composite = new Canvas(shell, SWT.NONE);
		composite.setLayoutData(new GridData(GridData.FILL_BOTH));
		
		GridLayout layout = new GridLayout();
		layout.marginWidth = 20;
		layout.marginHeight = 20;
		composite.setLayout(layout);
		
		final Spinner spinner = new Spinner(composite, SWT.BORDER);
		spinner.setMinimum(0);
		spinner.setMaximum(100);
		GridData data = new GridData(GridData.FILL, GridData.CENTER, false, false);
		data.minimumWidth = 150;
		data.widthHint = 150;
		spinner.setLayoutData(data);
		
		composite.addPaintListener(new PaintListener() {
			@Override
			public void paintControl(PaintEvent e) {
				Rectangle ibounds = new Rectangle(10, 10, 10, 10);
				Rectangle sbounds = spinner.getBounds();
				Point rel = spinner.toDisplay(sbounds.width, 0);
				
				Point p = spinner.getParent().toControl(rel);
				e.gc.drawRectangle(p.x, p.y, ibounds.width, ibounds.height);
			}
		});
		
		shell.open();
		while (!shell.isDisposed()) {
			if (!display.readAndDispatch())
				display.sleep();
		}
		display.dispose();
	}
}