SWT ScrolledComposite Examples to accompany this article: http://www.codeaffine.com/2016/03/01/swt-scrolledcomposite/

FixedVersusExpandingContent.java

package com.codeaffine.scrolledcomposite;

import org.eclipse.swt.SWT;
import org.eclipse.swt.custom.CLabel;
import org.eclipse.swt.custom.ScrolledComposite;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;

/**
 * Brings face to face a ScrolledComposite with fixed content and, on the right side, a ScrolledComposite with expanding content.
 */
public class FixedVersusExpandingContent {

  private static final int STYLE = SWT.BORDER | SWT.H_SCROLL | SWT.V_SCROLL;

  public static void main( String[] args ) {
    Display display = new Display();
    Shell shell = new Shell( display );
    shell.setText( "ScrolledComposite in 'scroll' and 'browser' mode" );
    shell.setLayout( new FillLayout() );
    ScrolledComposite leftSC = new ScrolledComposite( shell, STYLE );
    CLabel leftLabel = new CLabel( leftSC, SWT.NONE );
    leftLabel.setBackground( display.getSystemColor( SWT.COLOR_DARK_GREEN ) );
    leftLabel.setForeground( display.getSystemColor( SWT.COLOR_WHITE ) );
    String leftText 
      = "Fixed size content.\n\n"
      + "Scrollbars appear if the\n"
      + "ScrolledComposite\nis resized to be too small\n"
      + "to show the entire content.";
    leftLabel.setText( leftText );
    leftLabel.setAlignment( SWT.CENTER );
    leftLabel.setSize( 250, 250 );
    leftSC.setContent( leftLabel );
    ScrolledComposite rightSC = new ScrolledComposite( shell, STYLE );
    CLabel rightLabel = new CLabel( rightSC, SWT.NONE );
    String rightText 
      = "Expanding content.\n\n"
      + "The content has a minimum size.\n"
      + "If the ScrolledComposite is\n"
      + "resized bigger than the minimum size,\n"
      + "the content will grow in size.\n"
      + "If the ScrolledComposite is made too small\n"
      + "to show the minimum size, scrollbars will appear.";
    rightLabel.setText( rightText );
    rightLabel.setBackground( display.getSystemColor( SWT.COLOR_DARK_GRAY ) );
    rightLabel.setForeground( display.getSystemColor( SWT.COLOR_WHITE ) );
    rightLabel.setAlignment( SWT.CENTER );
    rightSC.setContent( rightLabel );
    rightSC.setExpandHorizontal( true );
    rightSC.setExpandVertical( true );
    rightSC.setMinSize( 250, 250 );
    shell.setSize( 600, 300 );
    shell.open();
    while( !shell.isDisposed() ) {
      if( !display.readAndDispatch() )
        display.sleep();
    }
    display.dispose();
  }
}

VerticallyScrolledForm.java

package com.codeaffine.scrolledcomposite;

import org.eclipse.swt.SWT;
import org.eclipse.swt.custom.ScrolledComposite;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Text;

/**
 * Shows an expanding ScrolledComposite that scrolls only vertically.
 */
public class VerticallyScrolledForm {
  
  public static void main( String[] args ) {
    new VerticallyScrolledForm().run();
  }
  
  private Shell shell;
  private ScrolledComposite scrolledComposite;

  void run() {
    createControls();
    layoutControls();
    openShell();
    runEventLoop();
  }

  private void createControls() {
    shell = new Shell( new Display() );
    shell.setText( "Contact Details Form" );
    shell.addListener( SWT.Dispose, event -> event.display.dispose() );
    scrolledComposite = new ScrolledComposite( shell, SWT.V_SCROLL );
    Composite parent = createForm();
    scrolledComposite.setContent( parent );
    scrolledComposite.setExpandVertical( true );
    scrolledComposite.setExpandHorizontal( true );
    scrolledComposite.addListener( SWT.Resize, event -> {
      int width = scrolledComposite.getClientArea().width;
      scrolledComposite.setMinSize( parent.computeSize( width, SWT.DEFAULT ) );
    } );
  }

  private void layoutControls() {
    shell.setLayout( new GridLayout( 1, false ) );
    GridData gridData = new GridData( SWT.FILL, SWT.FILL, true, true );
    gridData.heightHint = computePreferredHeight();
    scrolledComposite.setLayoutData( gridData );
  }

  private void openShell() {
    shell.pack();
    shell.open();
  }

  private void runEventLoop() {
    while( !shell.isDisposed() ) {
      if( !shell.getDisplay().readAndDispatch() ) {
        shell.getDisplay().sleep();
      }
    }
  }

  private int computePreferredHeight() {
    int numberOfLines = 10;
    int defaultHorizontalSpacing = 5; 
    Text text = new Text( shell, SWT.BORDER );
    text.setText( "X" );
    Point preferredSize = text.computeSize( SWT.DEFAULT, SWT.DEFAULT );
    text.dispose();
    return numberOfLines * ( preferredSize.y + defaultHorizontalSpacing );
  }

  private Composite createForm() {
    Composite result = new Composite( scrolledComposite, SWT.NONE );
    result.setLayout( new GridLayout( 2, false ) );
    createField( result, "Title" );
    createField( result, "Salutation" );
    createField( result, "First name" );
    createField( result, "Middle name" );
    createField( result, "Last name" );
    createField( result, "Maiden name" );
    createField( result, "Street" );
    createField( result, "Street supplement" );
    createField( result, "PO Box" );
    createField( result, "Zip code" );
    createField( result, "City" );
    createField( result, "State" );
    createField( result, "Country" );
    createField( result, "Private Phone" );
    createField( result, "Mobile Phone" );
    createField( result, "Email address" );
    createField( result, "Web site" );
    return result;
  }

  private static void createField( Composite parent, String labelText ) {
    Label label = new Label( parent, SWT.NONE );
    label.setText( labelText );
    Text text = new Text( parent, SWT.BORDER );
    text.setLayoutData( new GridData( SWT.FILL, SWT.CENTER, true, false ) );
  }
}