public void actionPerformed(ActionEvent e) {
   calc = (Calculator) e.getSource();
   antwoordVeld.setText(
       "<["
           + calc.getBase().getName()
           + ","
           + calc.getFormat().getName()
           + ","
           + calc.firstOperand()
           + ", "
           + calc.secondOperand()
           + "] >");
 }
  public void runCalculatorDialog(MouseEvent e) {
    if (calculatorDialog == null) {
      JFrame frame = null;
      Container container = getTopLevelAncestor();

      if (container instanceof JFrame) {
        frame = (JFrame) container;
      }

      calculatorDialog = new JDialog(frame, "Rechner", true);
      calculator = new Calculator();
      calculator.getOKButton().addActionListener(this);
      calculatorDialog.getContentPane().add(calculator);
      calculatorDialog.pack();
    }

    // Set calculator's init value

    Money money = getValue();

    if (money != null) {
      calculator.setValue(money.getValue());
    } else {
      calculator.setValue(0.0);
    }

    // calculate POP (point of presentation)

    Point point = ((JComponent) e.getSource()).getLocationOnScreen();
    int x = point.x + e.getX();
    int y = point.y + e.getY();

    // ensure that it does not exceed the screen limits

    Dimension screenDim = Toolkit.getDefaultToolkit().getScreenSize();
    Dimension dim = calculatorDialog.getPreferredSize();
    if (x + dim.width >= screenDim.width) {
      x = screenDim.width - dim.width - 1;
    }
    if (y + dim.height >= screenDim.height) {
      y = screenDim.height - dim.height - 1;
    }

    // make it visible at wanted location

    calculatorDialog.setLocation(x, y);
    calculatorDialog.show();
  }
  /** Overload hasFocus. */
  public boolean hasFocus() {
    if (moneyField.hasFocus() || (calculator != null && calculator.hasFocus())) {
      return true;
    }

    return false;
  }
  public void actionPerformed(ActionEvent e) {
    Object source = e.getSource();

    if (calculator != null && source == calculator.getOKButton()) {
      calculatorDialog.setVisible(false);
      setValue(new Money(calculator.convertOutput(), moneyField.getValue().getCurrency()));
    } else if (source == copyItem) {
      Clipboard clipboard = getToolkit().getSystemClipboard();
      Money value = getValue();

      if (value == null) {
        getToolkit().beep();
        return;
      }

      StringSelection contents = new StringSelection(value.toString());
      clipboard.setContents(contents, defaultClipboardOwner);
    } else if (source == pasteItem) {
      Clipboard clipboard = getToolkit().getSystemClipboard();
      Transferable content = clipboard.getContents(this);

      if (content == null) {
        setValue(null);
        getToolkit().beep();
        return;
      }

      try {
        String moneyData = (String) (content.getTransferData(DataFlavor.stringFlavor));
        int index = moneyData.indexOf(' ');

        if (index <= 0) {
          getToolkit().beep();
          return;
        }

        String value = moneyData.substring(0, index);
        String currencyAbbreviation = moneyData.substring(index + 1);

        value = value.replace(',', '.');
        Money money = new Money(value, Money.getCurrencyValueFor(currencyAbbreviation));
        setValue(money);
      } catch (Exception ex) {
        getToolkit().beep();
      }
    } else if (source == calculatorItem) {
      Dimension size = this.moneyField.getSize();

      runCalculatorDialog(
          new MouseEvent(
              this,
              0, // id
              System.currentTimeMillis(), // when
              0, // modifiers
              size.width, // x
              size.height, // y
              1, // clickCount
              true // popuptrigger
              ));
    } else if (source instanceof JMenuItem) {
      JMenuItem menuItem = (JMenuItem) source;

      // Perform 'changed currency' - action

      String actionText = menuItem.getActionCommand();

      // Cut off additional information from actionCommand

      int currencyDelimPos = actionText.indexOf(" ");

      if (currencyDelimPos > 0) {
        actionText = actionText.substring(0, currencyDelimPos);
      }

      // lastCurrencyItem will show any currency except the default ones

      boolean isNotDefault = true;

      for (int i = 0; i < defaultCurrencies.length; i++) {
        if (defaultCurrencies[i].equals(actionText)) {
          isNotDefault = false;
          break;
        }
      }

      // @todo ... check if lastCurrencyItem is needed or not [aj] seems to be old stuff
      if (isNotDefault && lastCurrencyItem != null) {
        lastCurrencyItem.setText(actionText);
      }

      // Change the currency

      changeCurrency(actionText, false);
    } else if ("popup".equals(e.getActionCommand())) // key: SHIFT+F10 <=> popup
    {
      Point point = getLocation();
      moneyPopup.doPopup(0, getHeight());
    }
  }