How to use

removePaintListener

method

in

org.eclipse.swt.widgets.Composite

public void dispose()
{
  if (composite != null && ! composite.isDisposed() && painter != null)
    composite.removePaintListener(painter);
  
  super.dispose();
}

@Override
public void dispose() {
  if (composite != null && !composite.isDisposed()) {
    composite.removePaintListener(this);
    composite.removeMouseListener(this);
    composite.removeMouseMoveListener(this);
    composite.removeMouseTrackListener(this);
  }
  if (disposeListeners != null) {
    for (Iterator iter = disposeListeners.iterator(); iter.hasNext();) {
      TableCellDisposeListener listener = (TableCellDisposeListener) iter.next();
      try {
        listener.dispose(this);
      } catch (Throwable e) {
        Debug.out(e);
      }
    }
    disposeListeners = null;
  }
  tableColumn.invokeCellDisposeListeners(this);
  tableColumn.invalidateCells();
}

protected void highlight(final Composite parent, final Label labelControl, final Combo comboBox, final int color) {
  Object data= labelControl.getData();
  if (data == null) {
    if (color != HIGHLIGHT_NONE) {
      PaintListener painter= new HighlightPainter(parent, labelControl, comboBox, color);
      parent.addPaintListener(painter);
      labelControl.setData(painter);
    } else {
      return;
    }
  } else {
    if (color == HIGHLIGHT_NONE) {
      parent.removePaintListener((PaintListener) data);
      labelControl.setData(null);
    } else if (color != ((HighlightPainter) data).fColor){
      ((HighlightPainter) data).fColor= color;
    } else {
      return;
    }
  }
  
  parent.redraw();
}

private void removeCompositeListeners(Composite c) {
  if (!c.isDisposed()) {
    printRemoveListener(c, "PAINT"); //$NON-NLS-1$
    c.removePaintListener(paintListener);
    printRemoveListener(c, "MOUSETRACK"); //$NON-NLS-1$
    c.removeMouseTrackListener(mouseTrackListener);
    printRemoveListener(c, "SWT.MenuDetect"); //$NON-NLS-1$
    c.removeListener(SWT.MenuDetect, compositeListener);
    printRemoveListener(c, "SWT.MouseDown"); //$NON-NLS-1$
    c.removeListener(SWT.MouseDown, compositeListener);
    printRemoveListener(c, "SWT.MouseDoubleClick"); //$NON-NLS-1$
    c.removeListener(SWT.MouseDoubleClick, compositeListener);
  }
}

  parent.removePaintListener((PaintListener) data);
  labelControl.setData(null);
} else if (color != ((HighlightPainter) data).fColor){

private void removeCompositeListeners(Composite c) {
 if(!c.isDisposed()) {
  printRemoveListener(c, "PAINT"); //$NON-NLS-1$
  c.removePaintListener(paintListener);
  printRemoveListener(c, "MOUSETRACK"); //$NON-NLS-1$
  c.removeMouseTrackListener(mouseTrackListener);
  printRemoveListener(c, "SWT.MenuDetect"); //$NON-NLS-1$
  c.removeListener(SWT.MenuDetect, compositeListener);
  printRemoveListener(c, "SWT.MouseDown"); //$NON-NLS-1$
  c.removeListener(SWT.MouseDown, compositeListener);
  printRemoveListener(c, "SWT.MouseDoubleClick"); //$NON-NLS-1$
  c.removeListener(SWT.MouseDoubleClick, compositeListener);
 }
}

private void removeCompositeListeners(Composite c) {
  if (!c.isDisposed()) {
    printRemoveListener(c, "PAINT"); //$NON-NLS-1$
    c.removePaintListener(paintListener);
    printRemoveListener(c, "MOUSETRACK"); //$NON-NLS-1$
    c.removeMouseTrackListener(mouseTrackListener);
    printRemoveListener(c, "SWT.MenuDetect"); //$NON-NLS-1$
    c.removeListener(SWT.MenuDetect, compositeListener);
    printRemoveListener(c, "SWT.MouseDown"); //$NON-NLS-1$
    c.removeListener(SWT.MouseDown, compositeListener);
    printRemoveListener(c, "SWT.MouseDoubleClick"); //$NON-NLS-1$
    c.removeListener(SWT.MouseDoubleClick, compositeListener);
  }
}

  @Override
  public void paintControl(PaintEvent e) {
    if (((GridData) fLabelControl.getLayoutData()).exclude) {
      fParent.removePaintListener(this);
      fLabelControl.setData(null);
      return;
    }
    
    int GAP= 7;
    int ARROW= 3;
    Rectangle l= fLabelControl.getBounds();
    Point c= fComboBox.getLocation();
    
    e.gc.setForeground(e.display.getSystemColor(fColor));
    int x2= c.x - GAP;
    int y= l.y + l.height / 2 + 1;
    
    e.gc.drawLine(l.x + l.width + GAP, y, x2, y);
    e.gc.drawLine(x2 - ARROW, y - ARROW, x2, y);
    e.gc.drawLine(x2 - ARROW, y + ARROW, x2, y);
  }
}