Description lukas myslivec 2008-05-21 04:21:22 EDT

http://dev.eclipse.org/viewcvs/index.cgi/org.eclipse.jface.snippets/Eclipse%20JFace%20Snippets/org/eclipse/jface/snippets/viewers/BooleanCellEditor.java?view=markup

When using the booleanCellEditor in combination with a databinding the cell gets empty if i am changing the checkbox to the origin value (like from true to false to true).

here is my code for fixing this problem:

public class BooleanCellEditor extends CellEditor
{
  private Button    button;
  private ViewerRow row;
  private int       index;
  private String    restoredText;
  private Image     restoredImage;
  private Boolean   oldValue;

  /**
   * @param parent
   */
  public BooleanCellEditor(Composite parent)
  {
    super(parent);
  }

  /**
   * @param parent
   * @param style
   */
  public BooleanCellEditor(Composite parent, int style)
  {
    super(parent, style);
  }

  public LayoutData getLayoutData()
  {
    LayoutData data = super.getLayoutData();
    data.horizontalAlignment = SWT.CENTER;
    data.grabHorizontal = false;
    return data;
  }

  protected Control createControl(Composite parent)
  {
    Font font = parent.getFont();
    Color bg = parent.getBackground();
    button = new Button(parent, getStyle() | SWT.CHECK);
    button.setFont(font);
    button.setBackground(bg);
    button.addKeyListener(new KeyAdapter()
    {
      /*
       * (non-Javadoc)
       *        * @see org.eclipse.swt.events.KeyAdapter#keyReleased(org.eclipse.swt.events.KeyEvent)
       */
      public void keyReleased(KeyEvent e)
      {
        if (e.character == SWT.ESC)
        {
          fireCancelEditor();
        }
      }
    });
    return button;
  }

  protected Object doGetValue()
  {
    return new Boolean(button.getSelection());
  }

  protected void doSetValue(Object value)
  {
    boolean selection = Boolean.TRUE.equals(value);
    button.setSelection(selection);
  }

  protected void doSetFocus()
  {
    if (button != null)
    {
      button.setFocus();
    }
  }

  protected void deactivate(ColumnViewerEditorDeactivationEvent event)
  {
    super.deactivate(event);
    if (event.eventType == ColumnViewerEditorDeactivationEvent.EDITOR_CANCELED
        || oldValue == button.getSelection())     {
      row.setImage(index, restoredImage);
      row.setText(index, restoredText);
    }
    row = null;
    restoredImage = null;
    restoredText = null;
  }

  public void activate(ColumnViewerEditorActivationEvent activationEvent)
  {
    ViewerCell cell = (ViewerCell) activationEvent.getSource();
    index = cell.getColumnIndex();
    row = (ViewerRow) cell.getViewerRow().clone();
    restoredImage = row.getImage(index);
    restoredText = row.getText(index);
    row.setImage(index, null);
    row.setText(index, ""); //$NON-NLS-1$
    super.activate(activationEvent);
    oldValue = button.getSelection();
  }

  /*
   * (non-Javadoc)
   *    * @see org.eclipse.jface.viewers.CellEditor#getDoubleClickTimeout()
   */
  protected int getDoubleClickTimeout()
  {
    return 0;
  }
}