org.eclipse.swt.widgets.Composite#setEnabled ( )源码实例Demo

@Override
  public void createControl(Composite parent) {
  	
      container = new Composite(parent, SWT.NONE);
      GridLayout layout = new GridLayout();
      container.setLayout(layout);
      // required to avoid an error in the system
      setControl(container);
      
      treeViewer = new TreeViewer(container, SWT.BORDER);
      treeViewer.setContentProvider(new TreeContentProvider());
      treeViewer.setLabelProvider(new MendeleyTreeLabelProvider());
      
      Tree tree = treeViewer.getTree();
      tree.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true, 1, 1));
      
      container.setEnabled(true);
      treeViewer.addSelectionChangedListener(new ISelectionChangedListener() {
	
	@Override
	public void selectionChanged(SelectionChangedEvent event) {
		treeViewer.getTree().deselect(treeViewer.getTree().getSelection()[0]);
	}
});
      
  }
 

protected void createSubtaskArea( Composite parent, ISubtaskSheet subtask )
{
	if ( getNavigatorTree( ).getSelection( ).length > 0 )
	{
		lblNodeTitle.setText( getNavigatorTree( ).getSelection( )[0].getText( ) );
	}
	super.createSubtaskArea( parent, subtask );

	// If the subtask is registered as disabled state, disable it.
	boolean bEnabled = ( (ChartWizardContext) getContext( ) ).isEnabled( subtask.getNodePath( ) );
	if ( !bEnabled )
	{
		disableControl( parent );
	}
	parent.setEnabled( bEnabled );
	lblNodeTitle.setEnabled( bEnabled );
}
 

private void setCompositeEnabled( Composite comp, boolean enabled ) {
  // TODO: move to TableView?
  comp.setEnabled( enabled );
  for ( Control child : comp.getChildren() ) {
    child.setEnabled( enabled );
  }
}
 

private static void nestedSetEnabled(Composite control, boolean enabled) {
    control.setEnabled(enabled);
    for (Control childControl : control.getChildren()) {
        if (childControl instanceof Composite) {
            nestedSetEnabled((Composite) childControl, enabled);
        } else {
            childControl.setEnabled(enabled);
        }
    }
}
 

/**
 * Enable the specific composite
 */
private void enableParent( Control control )
{
	Composite parent = control.getParent( );
	if ( parent == null || parent instanceof Shell )
	{
		return;
	}
	if ( !parent.isEnabled( ) )
	{
		parent.setEnabled( true );
	}
	enableParent( parent );
}
 

/**
 * Enable the specified composite.
 */
private void enableParent( Control control )
{
    Composite parent = control.getParent( );
    if ( parent == null || parent instanceof Shell )
    {
        return;
    }
    if ( !parent.isEnabled( ) )
    {
        parent.setEnabled( true );
    }
    enableParent( parent );
}
 

private void enableComposite( Composite composite, boolean enable )
{
	if ( composite.isEnabled( ) != enable )
	{
		composite.setEnabled( enable );
		Control[] controls = composite.getChildren( );
		for ( int i = 0; i < controls.length; i++ )
		{
			controls[i].setEnabled( enable );
		}
	}
}
 

private void disableControl( Composite container )
{
	Control[] children = container.getChildren( );
	for ( int i = 0; i < children.length; i++ )
	{
		if ( children[i] instanceof Composite )
			disableControl( (Composite) children[i] );
		else if ( !( children[i] instanceof Label ) )
			children[i].setEnabled( false );
	}
	container.setEnabled( false );
}
 

/**
 * En-/disables the composite and its children.
 *
 * @param elem
 * @param val
 */
private static void setEnabled(final Composite elem, final boolean val) {
    elem.setEnabled(val);
    for (final Control c : elem.getChildren()) {
        if (c instanceof Composite) {
            setEnabled((Composite) c, val);
        } else {
            c.setEnabled(val);
        }
    }
}
 

public static void main(String[] args) {
  Display display = new Display();
  final Shell shell = new Shell(display);
  final Composite composite = new Composite(shell, SWT.NONE);
  composite.setEnabled(false);
  composite.setLayout(new FillLayout());
  Button button = new Button(composite, SWT.PUSH);
  button.setText("Button");
  composite.pack();
  composite.setLocation(10, 10);
  final Point[] offset = new Point[1];
  Listener listener = new Listener() {
    public void handleEvent(Event event) {
      switch (event.type) {
      case SWT.MouseDown:
        Rectangle rect = composite.getBounds();
        if (rect.contains(event.x, event.y)) {
          Point pt1 = composite.toDisplay(0, 0);
          Point pt2 = shell.toDisplay(event.x, event.y);
          offset[0] = new Point(pt2.x - pt1.x, pt2.y - pt1.y);
        }
        break;
      case SWT.MouseMove:
        if (offset[0] != null) {
          Point pt = offset[0];
          composite.setLocation(event.x - pt.x, event.y - pt.y);
        }
        break;
      case SWT.MouseUp:
        offset[0] = null;
        break;
      }
    }
  };
  shell.addListener(SWT.MouseDown, listener);
  shell.addListener(SWT.MouseUp, listener);
  shell.addListener(SWT.MouseMove, listener);
  shell.setSize(300, 300);
  shell.open();
  while (!shell.isDisposed()) {
    if (!display.readAndDispatch())
      display.sleep();
  }
  display.dispose();
}
 

private void setCompositeEnabled( Composite comp, boolean enabled ) {
  comp.setEnabled( enabled );
  for ( Control child : comp.getChildren() ) {
    child.setEnabled( enabled );
  }
}