How to use

addListener

method

in

org.eclipse.swt.widgets.Composite

label = new Label( parent, SWT.BORDER );
label.setText( "0 object(s)" );
parent.addListener( SWT.Resize, new Listener() {
 public void handleEvent( Event e ) {
  layout();

composite.addListener( SWT.Resize, new Listener() {
 public void handleEvent( Event e ) {
  Rectangle rect = composite.getClientArea();

composite.addListener( SWT.Resize, new Listener() {
 public void handleEvent( Event e ) {
  Rectangle rect = composite.getClientArea();

composite.addListener( SWT.Resize, new Listener() {
 public void handleEvent( Event e ) {
  Rectangle rect = composite.getClientArea();

@Override
public void
addListener(
  int			type,
  Listener    l )
{
  browser.addListener( type, l );
}

composite.addListener(SWT.Resize, new Listener() {
  public void handleEvent(Event e) {
    changeImage();

protected CompositeEditorHelper(Composite composite)
{
 this.composite = composite;
 composite.addListener(SWT.Selection, this);
 composite.addListener(SWT.DefaultSelection, this);
 composite.addListener(SWT.Dispose, this);
 compositeEditor = createControlEditor(composite);
 compositeEditor.horizontalAlignment = SWT.LEFT;
 compositeEditor.grabHorizontal = true;
}

/**
 * Initialize
 */
public TableTooltips(TableViewSWT tv, Composite composite) {
  this.tv = tv;
  this.composite = composite;
  mainShell = composite.getShell();
  composite.addListener(SWT.Dispose, this);
  composite.addListener(SWT.KeyDown, this);
  composite.addListener(SWT.MouseMove, this);
  composite.addListener(SWT.MouseHover, this);
  composite.addListener(SWT.MouseExit, this);
  mainShell.addListener(SWT.Deactivate, this);
  tv.getComposite().addListener(SWT.Deactivate, this);
}

/**
 * Performs an asynchronous layout on the given composite anytime that it is resized.
 * <p>
 * This can often fix graphical glitches with resize-to-fit layouts, such as a `TableColumnLayout`.
 */
public static void asyncLayoutOnResize(Composite cmp) {
  cmp.addListener(SWT.Resize, e -> asyncLayout(cmp));
  // trigger the first one by hand
  asyncLayout(cmp);
}

/**
 * Create the control of the inner editor.
 *
 * Must be called by subclass.
 */
public Composite createInnerPartControl(Composite parent,
    final IEditorPart e) {
  Composite content = new Composite(parent, SWT.NONE);
  content.setLayout(new FillLayout());
  e.createPartControl(content);
  parent.addListener(SWT.Activate, event -> {
    if (event.type == SWT.Activate) {
      activateEditor(e);
    }
  });
  return content;
}

private void installCompositeListeners(Composite c) {
  if (!c.isDisposed()) {
    printAddListener(c, "PAINT"); //$NON-NLS-1$
    c.addPaintListener(paintListener);
    printAddListener(c, "MOUSETRACK"); //$NON-NLS-1$
    c.addMouseTrackListener(mouseTrackListener);
    printAddListener(c, "SWT.MenuDetect"); //$NON-NLS-1$
    c.addListener(SWT.MenuDetect, compositeListener);
    printAddListener(c, "SWT.MouseDown"); //$NON-NLS-1$
    c.addListener(SWT.MouseDown, compositeListener);
    printAddListener(c, "SWT.MouseDoubleClick"); //$NON-NLS-1$
    c.addListener(SWT.MouseDoubleClick, compositeListener);
  }
}

private void installCompositeListeners(Composite c) {
  if (!c.isDisposed()) {
    printAddListener(c, "PAINT"); //$NON-NLS-1$
    c.addPaintListener(paintListener);
    printAddListener(c, "MOUSETRACK"); //$NON-NLS-1$
    c.addMouseTrackListener(mouseTrackListener);
    printAddListener(c, "SWT.MenuDetect"); //$NON-NLS-1$
    c.addListener(SWT.MenuDetect, compositeListener);
    printAddListener(c, "SWT.MouseDown"); //$NON-NLS-1$
    c.addListener(SWT.MouseDown, compositeListener);
    printAddListener(c, "SWT.MouseDoubleClick"); //$NON-NLS-1$
    c.addListener(SWT.MouseDoubleClick, compositeListener);
  }
}

private void installCompositeListeners(Composite c) {
 if(!c.isDisposed()) {
  printAddListener(c, "PAINT"); //$NON-NLS-1$
  c.addPaintListener(paintListener);
  printAddListener(c, "MOUSETRACK"); //$NON-NLS-1$
  c.addMouseTrackListener(mouseTrackListener);
  printAddListener(c, "SWT.MenuDetect"); //$NON-NLS-1$
  c.addListener(SWT.MenuDetect, compositeListener);
  printAddListener(c, "SWT.MouseDown"); //$NON-NLS-1$
  c.addListener(SWT.MouseDown, compositeListener);
  printAddListener(c, "SWT.MouseDoubleClick"); //$NON-NLS-1$
  c.addListener(SWT.MouseDoubleClick, compositeListener);
 }
}

private void installActivationListener() {
  if (activationListener == null) {
    activationListener = new Listener() {
      @Override
      public void handleEvent(Event event) {
        boolean wasHeaderActive = event.widget != getContainer();
        int activePage = getActivePage();
        if (SharedHeaderFormEditor.this.wasHeaderActive != wasHeaderActive && activePage != -1 && pages.get(activePage) instanceof IEditorPart) {
          if (wasHeaderActive) {
            deactivateSite(true, true);
          } else {
            activateSite();
          }
        }
        SharedHeaderFormEditor.this.wasHeaderActive = wasHeaderActive;
      }
    };
    getContainer().addListener(SWT.Activate, activationListener);
    getHeaderForm().getForm().getForm().getHead().addListener(SWT.Activate, activationListener);
  }
}

/**
 * <p>
 * Adds a {@link Listener} for the defined eventType. The listener will be notified when the event occurs anywhere
 * on the {@link Composite}. It doesn't matter if the {@link Composite} holds controls or not.
 * </p>
 *
 * @since 0.10
 */
public void addGroupedListener( int eventType, Listener listener )
 throws IllegalArgumentException, IllegalStateException
{
 whenNull( listener ).throwIllegalArgument( "Listener must not be null" );
 Composite facade = getFacade();
 facade.addListener( eventType, listener );
}

/**
 * @param area
 * @param event id
 * @param listener
 */
public static void addListenerAndChildren(Composite area, int event,
    Listener listener) {
  area.addListener(event, listener);
  Control[] children = area.getChildren();
  for (int i = 0; i < children.length; i++) {
    Control child = children[i];
    if (child instanceof Composite) {
      addListenerAndChildren((Composite) child, event, listener);
    } else {
      child.addListener(event, listener);
    }
  }
}

/**
 * Initializes automatic resize of the tree control columns. The size of these will be adjusted when a node is
 * expanded or collapsed and when the tree changes size.
 * 
 * @param tree
 *            the tree to resize
 */
private void installAutomaticResize(final Tree tree) {
  Listener listener = new Listener() {
    public void handleEvent(Event e) {
      packColumnsAsync(tree);
    }
  };
  // Automatically resize columns when we expand tree nodes.
  tree.addListener(SWT.Collapse, listener);
  tree.addListener(SWT.Expand, listener);
  tree.getParent().addListener(SWT.Resize, listener);
}

private Composite getHostPane() {
  if (hostPane != null) {
    setHostSize(); // Always start with the persisted size
    return hostPane;
  }
  // Create one
  hostPane = new Composite(trimStackTB.getShell(), SWT.NONE);
  hostPane.setData(ShellActivationListener.DIALOG_IGNORE_KEY, Boolean.TRUE);
  setHostSize();
  hostPane.addListener(SWT.Traverse, escapeListener);
  // Set a special layout that allows resizing
  fixedSides = getFixedSides();
  hostPane.setLayout(new TrimPaneLayout(toolControl, fixedSides));
  return hostPane;
}

private void installActivationListener() {
  if (activationListener == null) {
    activationListener = event -> {
      boolean wasHeaderActive = event.widget != getContainer();
      int activePage = getActivePage();
      if (SharedHeaderFormEditor.this.wasHeaderActive != wasHeaderActive && activePage != -1
          && pages.get(activePage) instanceof IEditorPart) {
        if (wasHeaderActive) {
          deactivateSite(true, true);
        } else {
          activateSite();
        }
      }
      SharedHeaderFormEditor.this.wasHeaderActive = wasHeaderActive;
    };
    getContainer().addListener(SWT.Activate, activationListener);
    getHeaderForm().getForm().getForm().getHead().addListener(SWT.Activate, activationListener);
  }
}

public static void main(String[] args) {
 Display display = new Display();
 final Shell shell = new Shell(display);
 shell.open();
 final Composite b = new Composite(shell, SWT.NONE);
 b.setBounds(20, 20, 80, 80);
 b.setBackground(display.getSystemColor(SWT.COLOR_BLUE));
 b.addListener(SWT.MouseDown, new Listener() {
  public void handleEvent(Event e) {
   Tracker tracker = new Tracker(b.getParent(), SWT.RESIZE);
   tracker.setStippled(true);
   Rectangle rect = b.getBounds();
   tracker.setRectangles(new Rectangle[] { rect });
   if (tracker.open()) {
    Rectangle after = tracker.getRectangles()[0];
    b.setBounds(after);
   }
   tracker.dispose();
  }
 });
 while (!shell.isDisposed()) {
  if (!display.readAndDispatch())
   display.sleep();
 }
 display.dispose();
}