SWT Tree Composite : Tree « SWT JFace Eclipse « Java

SWT Tree Composite

SWT/JFace in Action
GUI Design with Eclipse 3.0
Matthew Scarpino, Stephen Holder, Stanford Ng, and Laurent Mihalkovic

ISBN: 1932394273

Publisher: Manning

import java.util.ArrayList;
import java.util.List;

import org.eclipse.jface.viewers.ITreeContentProvider;
import org.eclipse.jface.viewers.TreeViewer;
import org.eclipse.jface.viewers.Viewer;
import org.eclipse.swt.SWT;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.Composite;

public class Ch8TreeComposite extends Composite {
  public Ch8TreeComposite(Composite parent) {
    super(parent, SWT.NULL);

  protected void populateControl() {
    FillLayout compositeLayout = new FillLayout();

    int[] selectionStyle = { SWT.SINGLE, SWT.MULTI };
    int[] checkStyle = { SWT.NONE, SWT.CHECK };

    for (int selection = 0; selection < selectionStyle.length; selection++) {
      for (int check = 0; check < checkStyle.length; check++) {
        int style = selectionStyle[selection] | checkStyle[check];

  private void createTreeViewer(int style) {
    TreeViewer viewer = new TreeViewer(this, style);

    viewer.setContentProvider(new ITreeContentProvider() {
      public Object[] getChildren(Object parentElement) {
        return ((TreeNode) parentElement).getChildren().toArray();

      public Object getParent(Object element) {
        return ((TreeNode) element).getParent();

      public boolean hasChildren(Object element) {
        return ((TreeNode) element).getChildren().size() > 0;

      public Object[] getElements(Object inputElement) {
        return ((TreeNode) inputElement).getChildren().toArray();

      public void dispose() {

      public void inputChanged(Viewer viewer, Object oldInput,
          Object newInput) {


  private TreeNode getRootNode() {
    TreeNode root = new TreeNode("root");
    root.addChild(new TreeNode("child 1").addChild(new TreeNode(
        "subchild 1")));
    root.addChild(new TreeNode("child 2").addChild(new TreeNode(
        "subchild 2").addChild(new TreeNode("grandchild 1"))));

    return root;


class TreeNode {
  private String name;

  private List children = new ArrayList();

  private TreeNode parent;

  public TreeNode(String n) {
    name = n;

  protected Object getParent() {
    return parent;

  public TreeNode addChild(TreeNode child) {
    child.parent = this;
    return this;

  public List getChildren() {
    return children;

  public String toString() {
    return name;


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