swt/org.argeo.cms.swt/src/org/argeo/cms/swt/widgets/ScrolledPage.java

   1 package org.argeo.cms.swt.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 import org.eclipse.swt.widgets.Control;
  10
  11 /**
  12  * A composite that can be scrolled vertically. It wraps a
  13  * {@link ScrolledComposite} (and is being wrapped by it), simplifying its
  14  * configuration.
  15  */
  16 public class ScrolledPage extends Composite {
  17         private static final long serialVersionUID = 1593536965663574437L;
  18
  19         private ScrolledComposite scrolledComposite;
  20
  21         public ScrolledPage(Composite parent, int style) {
  22                 this(parent, style, false);
  23         }
  24
  25         public ScrolledPage(Composite parent, int style, boolean alwaysShowScroll) {
  26                 super(createScrolledComposite(parent, alwaysShowScroll), style);
  27                 scrolledComposite = (ScrolledComposite) getParent();
  28                 scrolledComposite.setContent(this);
  29
  30                 scrolledComposite.setExpandVertical(true);
  31                 scrolledComposite.setExpandHorizontal(true);
  32                 scrolledComposite.addControlListener(new ScrollControlListener());
  33         }
  34
  35         private static ScrolledComposite createScrolledComposite(Composite parent, boolean alwaysShowScroll) {
  36                 ScrolledComposite scrolledComposite = new ScrolledComposite(parent, SWT.V_SCROLL);
  37                 scrolledComposite.setAlwaysShowScrollBars(alwaysShowScroll);
  38                 return scrolledComposite;
  39         }
  40
  41         @Override
  42         public void layout(boolean changed, boolean all) {
  43                 updateScroll();
  44                 super.layout(changed, all);
  45         }
  46
  47         public void showControl(Control control) {
  48                 scrolledComposite.showControl(control);
  49         }
  50
  51         protected void updateScroll() {
  52                 Rectangle r = scrolledComposite.getClientArea();
  53                 Point preferredSize = computeSize(r.width, SWT.DEFAULT);
  54                 scrolledComposite.setMinHeight(preferredSize.y);
  55         }
  56
  57         // public ScrolledComposite getScrolledComposite() {
  58         // return this.scrolledComposite;
  59         // }
  60
  61         /** Set it on the wrapping scrolled composite */
  62         @Override
  63         public void setLayoutData(Object layoutData) {
  64                 scrolledComposite.setLayoutData(layoutData);
  65         }
  66
  67         private class ScrollControlListener extends org.eclipse.swt.events.ControlAdapter {
  68                 private static final long serialVersionUID = -3586986238567483316L;
  69
  70                 public void controlResized(ControlEvent e) {
  71                         updateScroll();
  72                 }
  73         }
  74 }