Description Robert Bjervås 2005-06-10 04:33:31 EDT

It's not possible to use the combination of a base class (inheriting Composite) 
and a final class inheriting the base class. The final class is not viewed 
correct in VE. The base class is viewed correct and also the Shell class that 
include the final Composite class. I have tested several ways to organize the 
code and the problem seems to be that the VE don't look into the base class to 
find any members that are visual controls. This is a not good since it reduce 
the possibility to adopt a OO design of the visual classes. I have tested it on 
the latest release of 3.0.2 and on the stable build 1.1M1.

/Robert

The test code:
BasePanel.java
==============
import org.eclipse.swt.widgets.*;
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.*;
import org.eclipse.swt.layout.*;

/**
 * Abstract class to be used as the common base for different implementations
 */
public class BasePanel extends Composite {
  private Composite top = null;
  private Composite bottom = null;
  public BasePanel(Composite parent, int style) {
    super(parent, style);
    initialize();
  }
  public Composite getBottom() {
    return bottom;
  }
  public Composite getTop() {
    return top;
  }
  private void initialize() {
    FormLayout layout1 = new FormLayout();
    layout1.marginHeight = 3;
    layout1.marginWidth = 3;
    layout1.spacing = 3;
    setBackground(new Color(Display.getDefault(), 128, 128, 255));
    createBottom();
    createTop();
    setSize(new Point(300,200));
    setLayout(layout1);
  }
  private void createTop() {
    top = new Composite(this, SWT.NONE);
    FillLayout layout2 = new FillLayout();
    FormData formData1 = new FormData();
    FormAttachment l = new FormAttachment(0);
    FormAttachment r = new FormAttachment(100);
    FormAttachment t = new FormAttachment(0);
    FormAttachment b = new FormAttachment(bottom);
    formData1.left = l;
    formData1.right = r;
    formData1.top = t;
    formData1.bottom = b;
    layout2.marginHeight = 3;
    layout2.marginWidth = 3;
    layout2.spacing = 3;
    top.setBackground(new Color(Display.getDefault(), 255, 128, 128));
    top.setLayoutData(formData1);
    top.setLayout(layout2);
  }
  private void createBottom() {
    bottom = new Composite(this, SWT.NONE);
    FillLayout layout3 = new FillLayout();
    FormData formData2 = new FormData();
    FormAttachment l = new FormAttachment(0);
    FormAttachment r = new FormAttachment(100);
    FormAttachment b = new FormAttachment(100);
    formData2.left = l;
    formData2.right = r;
    formData2.bottom = b;
    formData2.height = 50;
    layout3.marginHeight = 3;
    layout3.marginWidth = 3;
    layout3.spacing = 3;
    bottom.setBackground(new Color(Display.getDefault(), 128, 255, 128));
    bottom.setLayoutData(formData2);
    bottom.setLayout(layout3);
  }
}

FooPanel.java
=============
import org.eclipse.swt.widgets.*;
import org.eclipse.swt.SWT;
/**
 * An implementation of BasePanel
 */
public class FooPanel extends BasePanel {
  private Button button = null;
  private Text text = null;
  public FooPanel(Composite parent, int style) {
    super(parent, style);
    initialize();
  }
  private void initialize() {
    button = new Button(getBottom(), SWT.NONE);
    text = new Text(getTop(), SWT.BORDER);
    button.setText("Push");
  }
}

Simple.java
===========
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.widgets.*;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.SWT;
/**
 * A simple window for testing VE using inheritage
 */
public class Simple {
  private Shell sShell = null;
  private Composite fooPanel = null;
  private void createSShell() {
    sShell = new Shell(SWT.DIALOG_TRIM | SWT.RESIZE);
    createComposite();
    sShell.setText("Simple test of VE");
    sShell.setLayout(new FillLayout());
    sShell.setSize(new Point(300,200));
  }
  private void createComposite() {
    fooPanel = new FooPanel(sShell, SWT.NONE);
  }
  public static void main(String[] args) {
    Simple simple = new Simple();
    Display display = new Display();
    simple.createSShell();
    simple.sShell.open();
    while (!simple.sShell.isDisposed()) {
      if (!display.readAndDispatch())
        display.sleep();
    }
    display.dispose();
  }
}