How to use

MetalComboBoxUI

in

javax.swing.plaf.metal

@Override
protected void uninstallListeners() {
  super.uninstallListeners();
  comboBox.removeMouseListener(_rolloverListener);
  _rolloverListener = null;
}

public Dimension getMinimumSize( JComponent c) {
 Dimension dim = super.getMinimumSize( c);
 
 if ( comboBox.isEditable() ) {
  dim.height = editor.getPreferredSize().height - 2;
 }
 
 dim.width += 20;
 
 return dim;
}
 

@Override
protected void uninstallDefaults() {
  super.uninstallDefaults();
  LookAndFeel.uninstallBorder(comboBox);
}

@Override
protected void installListeners() {
  super.installListeners();
  if (_rolloverListener == null) {
    _rolloverListener = createRolloverListener();
  }
  comboBox.addMouseListener(_rolloverListener);
}

@Override
protected void installDefaults() {
  super.installDefaults();
  JideSwingUtilities.installBorder(comboBox, createComboBoxBorder());
}

@Override
protected JButton createArrowButton() {
 JButton button = super.createArrowButton();
 if (isArrowButtonShownAsMandatory()) {
  button.setBackground(getMandatoryColor());
 }
 return button;
}

@Override
public void configureArrowButton() {
 super.configureArrowButton();
 if (isArrowButtonShownAsMandatory()) {
  arrowButton.setBackground(getMandatoryColor());
 }
}

@Override
protected void installListeners() {
 super.installListeners();
 if (((TentackleLookAndFeel)UIManager.getLookAndFeel()).isFocusAnimated()) {
  comboBox.addFocusListener(new KComboBoxFlasherListener());
 }
}

protected void installDefaults() {
 super.installDefaults();
  oldOpaque = comboBox.isOpaque();
 comboBox.setOpaque( false);
}

@Override
protected void uninstallListeners() {
 super.uninstallListeners();
 TFlasherListener.removeFlasherListener(comboBox);
}

protected  void installListeners() {
 super.installListeners();
 miML = new MiML();
 comboBox.addMouseListener( miML);
 comboBox.addFocusListener( miML);
}
 

protected void uninstallDefaults() {
 super.uninstallDefaults();
 
 comboBox.setOpaque( oldOpaque);
}

    arrowButton != null &&
    editor != null) {
  size = super.getMinimumSize(c);
  Insets margin = arrowButton.getMargin();
  size.height += margin.top + margin.bottom - 2;
  size.width += margin.left + margin.right;
} else {
  size = super.getMinimumSize(c);

protected  void uninstallListeners() {
 super.uninstallListeners();
 comboBox.removeMouseListener( miML);
 comboBox.removeFocusListener( miML);
}
 

protected void installListeners() {
  super.installListeners();
  if (popup instanceof BasicComboPopup) {
    popupHandler = new PopupHandler();
    ((BasicComboPopup) popup).addPopupMenuListener(popupHandler);
    comboBox.addFocusListener(focusHandler = new FocusHandler());
  }
}

protected void uninstallListeners() {
  super.uninstallListeners();
  if (popup instanceof BasicComboPopup) {
    ((BasicComboPopup) popup).removePopupMenuListener(popupHandler);
    comboBox.removeFocusListener(focusHandler);
  }
}