ui/widgets/ScrolledPage.java

   1 package org.argeo.cms.ui.widgets;
   2
   3 import org.eclipse.swt.SWT;
   4 import org.eclipse.swt.custom.ScrolledComposite;
   5 import org.eclipse.swt.events.ControlEvent;
   6 import org.eclipse.swt.graphics.Point;
   7 import org.eclipse.swt.graphics.Rectangle;
   8 import org.eclipse.swt.widgets.Composite;
   9
  10 /**
  11  * A composite that can be scrolled vertically. It wraps a
  12  * {@link ScrolledComposite} (and is being wrapped by it), simplifying its
  13  * configuration.
  14  */
  15 public class ScrolledPage extends Composite {
  16         private static final long serialVersionUID = 1593536965663574437L;
  17
  18         private ScrolledComposite scrolledComposite;
  19
  20         public ScrolledPage(Composite parent, int style) {
  21                 this(parent, style, false);
  22         }
  23
  24         public ScrolledPage(Composite parent, int style, boolean alwaysShowScroll) {
  25                 super(createScrolledComposite(parent, alwaysShowScroll), style);
  26                 scrolledComposite = (ScrolledComposite) getParent();
  27                 scrolledComposite.setContent(this);
  28
  29                 scrolledComposite.setExpandVertical(true);
  30                 scrolledComposite.setExpandHorizontal(true);
  31                 scrolledComposite.addControlListener(new ScrollControlListener());
  32         }
  33
  34         private static ScrolledComposite createScrolledComposite(Composite parent, boolean alwaysShowScroll) {
  35                 ScrolledComposite scrolledComposite = new ScrolledComposite(parent, SWT.V_SCROLL);
  36                 scrolledComposite.setAlwaysShowScrollBars(alwaysShowScroll);
  37                 return scrolledComposite;
  38         }
  39
  40         @Override
  41         public void layout(boolean changed, boolean all) {
  42                 updateScroll();
  43                 super.layout(changed, all);
  44         }
  45
  46         protected void updateScroll() {
  47                 Rectangle r = scrolledComposite.getClientArea();
  48                 Point preferredSize = computeSize(r.width, SWT.DEFAULT);
  49                 scrolledComposite.setMinHeight(preferredSize.y);
  50         }
  51
  52         // public ScrolledComposite getScrolledComposite() {
  53         // return this.scrolledComposite;
  54         // }
  55
  56         /** Set it on the wrapping scrolled composite */
  57         @Override
  58         public void setLayoutData(Object layoutData) {
  59                 scrolledComposite.setLayoutData(layoutData);
  60         }
  61
  62         private class ScrollControlListener extends org.eclipse.swt.events.ControlAdapter {
  63                 private static final long serialVersionUID = -3586986238567483316L;
  64
  65                 public void controlResized(ControlEvent e) {
  66                         updateScroll();
  67                 }
  68         }
  69 }