package org.argeo.cms.ui.widgets;
   
   import org.eclipse.swt.SWT;
   import org.eclipse.swt.custom.ScrolledComposite;
   import org.eclipse.swt.events.ControlEvent;
   import org.eclipse.swt.graphics.Point;
   import org.eclipse.swt.graphics.Rectangle;
   import org.eclipse.swt.widgets.Composite;
   
  /**
   * A composite that can be scrolled vertically. It wraps a
   * {@link ScrolledComposite} (and is being wrapped by it), simplifying its
   * configuration.
   */
  public class ScrolledPage extends Composite {
  	private static final long serialVersionUID = 1593536965663574437L;
  
  	private ScrolledComposite scrolledComposite;
  
  	public ScrolledPage(Composite parent, int style) {
  		super(new ScrolledComposite(parent, SWT.V_SCROLL), style);
  		scrolledComposite = (ScrolledComposite) getParent();
  		scrolledComposite.setContent(this);
  
  		scrolledComposite.setExpandVertical(true);
  		scrolledComposite.setExpandHorizontal(true);
  		scrolledComposite.addControlListener(new ScrollControlListener());
  	}
  
  	@Override
  	public void layout(boolean changed, boolean all) {
  		updateScroll();
  		super.layout(changed, all);
  	}
  
  	protected void updateScroll() {
  		Rectangle r = scrolledComposite.getClientArea();
  		Point preferredSize = computeSize(r.width, SWT.DEFAULT);
  		scrolledComposite.setMinHeight(preferredSize.y);
  	}
  
  	// public ScrolledComposite getScrolledComposite() {
  	// return this.scrolledComposite;
  	// }
  
  	/** Set it on the wrapping scrolled composite */
  	@Override
  	public void setLayoutData(Object layoutData) {
  		scrolledComposite.setLayoutData(layoutData);
  	}
  
  	private class ScrollControlListener extends
  			org.eclipse.swt.events.ControlAdapter {
  		private static final long serialVersionUID = -3586986238567483316L;
  
  		public void controlResized(ControlEvent e) {
  			updateScroll();
  		}
  	}
  }