How to use

setBounds

method

in

org.eclipse.swt.widgets.ExpandItem

void onResize () {
  Rectangle rect = getClientArea ();    
  int width = Math.max (0, rect.width - spacing * 2);
  for (int i = 0; i < itemCount; i++) {
    ExpandItem item = items[i];
    item.setBounds (0, 0, width, item.height, false, true);
  }
  setScrollbar ();
}

private void updateBounds() {
 int parentWidth = parent.computeSize( SWT.DEFAULT, SWT.DEFAULT, false ).x;
 int scrollBarWidth = parent.getVScrollBarWidth();
 int availableWidth = parentWidth - 2 * parent.spacing - scrollBarWidth;
 width = Math.max( getPreferredWidth(), availableWidth );
 setBounds( 0, 0, width, height, false, true );
}

void layoutItems (int index, boolean setScrollbar) {
  if (index < itemCount) {
    int y = spacing - yCurrentScroll;
    for (int i = 0; i < index; i++) {
      ExpandItem item = items [i];
      if (item.expanded) y += item.height;
      y += item.getHeaderHeight() + spacing;
    }
    for (int i = index; i < itemCount; i++) {
      ExpandItem item = items [i];
      item.setBounds (spacing, y, 0, 0, true, false);
      if (item.expanded) y += item.height;
      y += item.getHeaderHeight() + spacing;
    }
  }
  if (setScrollbar) setScrollbar ();
}

/**
 * Sets the height of the receiver. This is height of the item when it is expanded, 
 * excluding the height of the header.
 *
 * @param height the new height
 *
 * @exception SWTException <ul>
 *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
 * </ul>
 */
public void setHeight (int height) {
  checkWidget ();
  if (height < 0) return;
  setBounds (0, 0, width, height, false, true);
  if (expanded) parent.layoutItems (parent.indexOf (this) + 1, true);
}

/**
 * Sets the height of the receiver. This is height of the item when it is
 * expanded, excluding the height of the header.
 *
 * @param height the new height
 * @exception SWTException
 *              <ul>
 *              <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
 *              <li>ERROR_THREAD_INVALID_ACCESS - if not called from the
 *              thread that created the receiver</li>
 *              </ul>
 */
public void setHeight( int height ) {
 checkWidget();
 if( height >= 0 ) {
  setBounds( 0, 0, width, height, false, true );
  if( expanded ) {
   parent.layoutItems( parent.indexOf( this ) + 1 );
  }
 }
}

/**
 * Sets the receiver's spacing. Spacing specifies the number of pixels allocated around 
 * each item.
 * 
 * @param spacing the spacing around each item
 *
 * @exception SWTException <ul>
 *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
 * </ul>
 */
public void setSpacing (int spacing) {
  checkWidget ();
  if (spacing < 0) return;
  if (spacing == this.spacing) return;
  this.spacing = spacing;
  int width = Math.max (0, getClientArea ().width - spacing * 2);
  for (int i = 0; i < itemCount; i++) {
    ExpandItem item = items[i];
    if (item.width != width) item.setBounds (0, 0, width, item.height, false, true);
  }
  layoutItems (0, true);
  redraw ();
}

for (int i = 0; i < itemCount; i++) {
  ExpandItem item2 = items[i];
  item2.setBounds (0, 0, width, item2.height, false, true);

for (int i = 0; i < itemCount; i++) {
  ExpandItem item2 = items[i];
  item2.setBounds (0, 0, width, item2.height, false, true);

for (int i = 0; i < itemCount; i++) {
  ExpandItem item2 = items[i];
  item2.setBounds (0, 0, width, item2.height, false, true);

 item.setBounds( spacing, y, 0, 0, true, false );
 if( item.expanded ) {
  y += item.height;
 item.setBounds( itemBounds.x, itemBounds.y, width, item.height, true, true );
} else {
 int width = bounds.width - ( border.left + border.right ) - 2 * spacing;
 item.setBounds( spacing, itemBounds.y, width, item.height, true, true );