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Scroll a child control automatically

/*  * Composite example snippet: scroll a child control automatically  *  * For a list of all SWT example snippets see  * http://dev.eclipse.org/viewcvs/index.cgi/%7Echeckout%7E/platform-swt-home/dev.html#snippets  */ import org.eclipse.swt.SWT; import org.eclipse.swt.graphics.Point; import org.eclipse.swt.graphics.Rectangle; import org.eclipse.swt.widgets.Composite; import org.eclipse.swt.widgets.Display; import org.eclipse.swt.widgets.Event; import org.eclipse.swt.widgets.Listener; import org.eclipse.swt.widgets.ScrollBar; import org.eclipse.swt.widgets.Shell; public class Snippet9 {   public static void main(String[] args) {     Display display = new Display();     final Shell shell = new Shell(display, SWT.SHELL_TRIM | SWT.H_SCROLL         | SWT.V_SCROLL);     final Composite composite = new Composite(shell, SWT.BORDER);     composite.setSize(200, 400);     final ScrollBar hBar = shell.getHorizontalBar();     hBar.addListener(SWT.Selection, new Listener() {       public void handleEvent(Event e) {         Point location = composite.getLocation();         location.x = -hBar.getSelection();         composite.setLocation(location);       }     });     final ScrollBar vBar = shell.getVerticalBar();     vBar.addListener(SWT.Selection, new Listener() {       public void handleEvent(Event e) {         Point location = composite.getLocation();         location.y = -vBar.getSelection();         composite.setLocation(location);       }     });     shell.addListener(SWT.Resize, new Listener() {       public void handleEvent(Event e) {         Point size = composite.getSize();         Rectangle rect = shell.getClientArea();         hBar.setMaximum(size.x);         vBar.setMaximum(size.y);         hBar.setThumb(Math.min(size.x, rect.width));         vBar.setThumb(Math.min(size.y, rect.height));         int hPage = size.x - rect.width;         int vPage = size.y - rect.height;         int hSelection = hBar.getSelection();         int vSelection = vBar.getSelection();         Point location = composite.getLocation();         if (hSelection >= hPage) {           if (hPage <= 0)             hSelection = 0;           location.x = -hSelection;         }         if (vSelection >= vPage) {           if (vPage <= 0)             vSelection = 0;           location.y = -vSelection;         }         composite.setLocation(location);       }     });     shell.open();     while (!shell.isDisposed()) {       if (!display.readAndDispatch())         display.sleep();     }     display.dispose();   } }