java.lang.Object
- javax.swing.plaf.ComponentUI
- - javax.swing.plaf.ComboBoxUI
  - - javax.swing.plaf.basic.BasicComboBoxUI

Direct Known Subclasses:

MetalComboBoxUI, SynthComboBoxUI
```
public class BasicComboBoxUI
extends ComboBoxUI
```
Basic UI implementation for JComboBox.
The combo box is a compound component which means that it is an agregate of many simpler components. This class creates and manages the listeners on the combo box and the combo box model. These listeners update the user interface in response to changes in the properties and state of the combo box.
All event handling is handled by listener classes created with the createxxxListener() methods and internal classes. You can change the behavior of this class by overriding the createxxxListener() methods and supplying your own event listeners or subclassing from the ones supplied in this class.
For adding specific actions, overide installKeyboardActions to add actions in response to KeyStroke bindings. See the article Keyboard Bindings in Swing at The Swing Connection.

Nested Class Summary

Nested Classes
Modifier and Type	Class and Description
`class`	`BasicComboBoxUI.ComboBoxLayoutManager` This layout manager handles the 'standard' layout of combo boxes.
`class`	`BasicComboBoxUI.FocusHandler` This listener hides the popup when the focus is lost.
`class`	`BasicComboBoxUI.ItemHandler` This listener watches for changes to the selection in the combo box.
`class`	`BasicComboBoxUI.KeyHandler` This listener checks to see if the key event isn't a navigation key.
`class`	`BasicComboBoxUI.ListDataHandler` This listener watches for changes in the `ComboBoxModel`.
`class`	`BasicComboBoxUI.PropertyChangeHandler` This listener watches for bound properties that have changed in the combo box.

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Field Summary

Fields
Modifier and Type	Field and Description
`protected JButton`	`arrowButton`
`protected Dimension`	`cachedMinimumSize`
`protected JComboBox`	`comboBox`
`protected CellRendererPane`	`currentValuePane`
`protected Component`	`editor`
`protected FocusListener`	`focusListener` This protected field is implementation specific.
`protected boolean`	`hasFocus` This protected field is implementation specific.
`protected boolean`	`isMinimumSizeDirty`
`protected ItemListener`	`itemListener` This protected field is implementation specific.
`protected KeyListener`	`keyListener` This protected field is implementation specific.
`protected JList`	`listBox`
`protected ListDataListener`	`listDataListener` This protected field is implementation specific.
`protected Insets`	`padding` If specified, these insets act as padding around the cell renderer when laying out and painting the "selected" item in the combo box.
`protected ComboPopup`	`popup`
`protected KeyListener`	`popupKeyListener`
`protected MouseListener`	`popupMouseListener`
`protected MouseMotionListener`	`popupMouseMotionListener`
`protected PropertyChangeListener`	`propertyChangeListener` This protected field is implementation specific.
`protected boolean`	`squareButton` Indicates whether or not the combo box button should be square.

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Constructor Summary
Constructors
Constructor and Description

BasicComboBoxUI()

BasicComboBoxUI (Java Platform SE 7 ) Home of API Java Contents Haut

Method Summary

Methods
Modifier and Type	Method and Description
`void`	`addEditor()` This public method is implementation specific and should be private.
`void`	`configureArrowButton()` This public method is implementation specific and should be private.
`protected void`	`configureEditor()` This protected method is implementation specific and should be private.
`protected JButton`	`createArrowButton()` Creates a button which will be used as the control to show or hide the popup portion of the combo box.
`protected ComboBoxEditor`	`createEditor()` Creates the default editor that will be used in editable combo boxes.
`protected FocusListener`	`createFocusListener()` Creates a `FocusListener` which will be added to the combo box.
`protected ItemListener`	`createItemListener()` Creates an `ItemListener` which will be added to the combo box.
`protected KeyListener`	`createKeyListener()` Creates a `KeyListener` which will be added to the combo box.
`protected LayoutManager`	`createLayoutManager()` Creates a layout manager for managing the components which make up the combo box.
`protected ListDataListener`	`createListDataListener()` Creates a list data listener which will be added to the `ComboBoxModel`.
`protected ComboPopup`	`createPopup()` Creates the popup portion of the combo box.
`protected PropertyChangeListener`	`createPropertyChangeListener()` Creates a `PropertyChangeListener` which will be added to the combo box.
`protected ListCellRenderer`	`createRenderer()` Creates the default renderer that will be used in a non-editiable combo box.
`static ComponentUI`	`createUI(JComponent c)`
`Accessible`	`getAccessibleChild(JComponent c, int i)` Returns the `i`th `Accessible` child of the object.
`int`	`getAccessibleChildrenCount(JComponent c)` Returns the number of accessible children in the object.
`int`	`getBaseline(JComponent c, int width, int height)` Returns the baseline.
`Component.BaselineResizeBehavior`	`getBaselineResizeBehavior(JComponent c)` Returns an enum indicating how the baseline of the component changes as the size changes.
`protected Dimension`	`getDefaultSize()` Return the default size of an empty display area of the combo box using the current renderer and font.
`protected Dimension`	`getDisplaySize()` Returns the calculated size of the display area.
`protected Insets`	`getInsets()` Gets the insets from the JComboBox.
`Dimension`	`getMaximumSize(JComponent c)` Returns the specified component's maximum size appropriate for the look and feel.
`Dimension`	`getMinimumSize(JComponent c)` The minumum size is the size of the display area plus insets plus the button.
`Dimension`	`getPreferredSize(JComponent c)` Returns the specified component's preferred size appropriate for the look and feel.
`protected Dimension`	`getSizeForComponent(Component comp)` Returns the size a component would have if used as a cell renderer.
`protected void`	`installComponents()` Creates and initializes the components which make up the aggregate combo box.
`protected void`	`installDefaults()` Installs the default colors, default font, default renderer, and default editor into the JComboBox.
`protected void`	`installKeyboardActions()` Adds keyboard actions to the JComboBox.
`protected void`	`installListeners()` Creates and installs listeners for the combo box and its model.
`void`	`installUI(JComponent c)` Configures the specified component appropriately for the look and feel.
`boolean`	`isFocusTraversable(JComboBox c)` Determines if the JComboBox is focus traversable.
`protected boolean`	`isNavigationKey(int keyCode)` Returns whether or not the supplied keyCode maps to a key that is used for navigation.
`boolean`	`isPopupVisible(JComboBox c)` Tells if the popup is visible or not.
`void`	`paint(Graphics g, JComponent c)` Paints the specified component appropriately for the look and feel.
`void`	`paintCurrentValue(Graphics g, Rectangle bounds, boolean hasFocus)` Paints the currently selected item.
`void`	`paintCurrentValueBackground(Graphics g, Rectangle bounds, boolean hasFocus)` Paints the background of the currently selected item.
`protected Rectangle`	`rectangleForCurrentValue()` Returns the area that is reserved for drawing the currently selected item.
`void`	`removeEditor()` This public method is implementation specific and should be private.
`protected void`	`selectNextPossibleValue()` Selects the next item in the list.
`protected void`	`selectPreviousPossibleValue()` Selects the previous item in the list.
`void`	`setPopupVisible(JComboBox c, boolean v)` Hides the popup.
`protected void`	`toggleOpenClose()` Hides the popup if it is showing and shows the popup if it is hidden.
`void`	`unconfigureArrowButton()` This public method is implementation specific and should be private.
`protected void`	`unconfigureEditor()` This protected method is implementation specific and should be private.
`protected void`	`uninstallComponents()` The aggregate components which compise the combo box are unregistered and uninitialized.
`protected void`	`uninstallDefaults()` Uninstalls the default colors, default font, default renderer, and default editor from the combo box.
`protected void`	`uninstallKeyboardActions()` Removes the focus InputMap and ActionMap.
`protected void`	`uninstallListeners()` Removes the installed listeners from the combo box and its model.
`void`	`uninstallUI(JComponent c)` Reverses configuration which was done on the specified component during `installUI`.

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Methods inherited from class javax.swing.plaf.ComponentUI contains, update

Methods inherited from class java.lang.Object clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - comboBox
    protected JComboBox comboBox
  - hasFocus
    protected boolean hasFocus
    
    This protected field is implementation specific. Do not access directly or override.
  - listBox
    protected JList listBox
  - currentValuePane
    protected CellRendererPane currentValuePane
  - popup
    protected ComboPopup popup
  - editor
    protected Component editor
  - arrowButton
    protected JButton arrowButton
  - keyListener
    protected KeyListener keyListener
    
    This protected field is implementation specific. Do not access directly or override. Override the listener construction method instead.
    
    See Also:
    createKeyListener()
  - focusListener
    protected FocusListener focusListener
    
    This protected field is implementation specific. Do not access directly or override. Override the listener construction method instead.
    
    See Also:
    createFocusListener()
  - propertyChangeListener
    protected PropertyChangeListener propertyChangeListener
    
    This protected field is implementation specific. Do not access directly or override. Override the listener construction method instead.
    
    See Also:
    createPropertyChangeListener()
  - itemListener
    protected ItemListener itemListener
    
    This protected field is implementation specific. Do not access directly or override. Override the listener construction method instead.
    
    See Also:
    createItemListener()
  - popupMouseListener
    protected MouseListener popupMouseListener
  - popupMouseMotionListener
    protected MouseMotionListener popupMouseMotionListener
  - popupKeyListener
    protected KeyListener popupKeyListener
  - listDataListener
    protected ListDataListener listDataListener
    
    This protected field is implementation specific. Do not access directly or override. Override the listener construction method instead.
    
    See Also:
    createListDataListener()
  - isMinimumSizeDirty
    protected boolean isMinimumSizeDirty
  - cachedMinimumSize
    protected Dimension cachedMinimumSize
  - squareButton
    protected boolean squareButton
    
    Indicates whether or not the combo box button should be square. If square, then the width and height are equal, and are both set to the height of the combo minus appropriate insets.
    
    Since:
    
    1.7
  - padding
    protected Insets padding
    
    If specified, these insets act as padding around the cell renderer when laying out and painting the "selected" item in the combo box. These insets add to those specified by the cell renderer.
    
    Since:
    
    1.7
- Constructor Detail
  - BasicComboBoxUI
    public BasicComboBoxUI()
- Method Detail
  - createUI
    public static ComponentUI createUI(JComponent c)
  - installUI
    public void installUI(JComponent c)
    
    Description copied from class: ComponentUI
    
    Configures the specified component appropriately for the look and feel. This method is invoked when the ComponentUI instance is being installed as the UI delegate on the specified component. This method should completely configure the component for the look and feel, including the following:
    
    Install default property values for color, fonts, borders, icons, opacity, etc. on the component. Whenever possible, property values initialized by the client program should not be overridden.
    Install a LayoutManager on the component if necessary.
    Create/add any required sub-components to the component.
    Create/install event listeners on the component.
    Create/install a PropertyChangeListener on the component in order to detect and respond to component property changes appropriately.
    Install keyboard UI (mnemonics, traversal, etc.) on the component.
    Initialize any appropriate instance data.
    
    Overrides:
    
    installUI in class ComponentUI
    
    Parameters:
    c - the component where this UI delegate is being installed
    See Also:
    ComponentUI.uninstallUI(javax.swing.JComponent), JComponent.setUI(javax.swing.plaf.ComponentUI), JComponent.updateUI()
  - uninstallUI
    public void uninstallUI(JComponent c)
    
    Description copied from class: ComponentUI
    
    Reverses configuration which was done on the specified component during installUI. This method is invoked when this UIComponent instance is being removed as the UI delegate for the specified component. This method should undo the configuration performed in installUI, being careful to leave the JComponent instance in a clean state (no extraneous listeners, look-and-feel-specific property objects, etc.). This should include the following:
    
    Remove any UI-set borders from the component.
    Remove any UI-set layout managers on the component.
    Remove any UI-added sub-components from the component.
    Remove any UI-added event/property listeners from the component.
    Remove any UI-installed keyboard UI from the component.
    Nullify any allocated instance data objects to allow for GC.
    
    Overrides:
    
    uninstallUI in class ComponentUI
    
    Parameters:
    c - the component from which this UI delegate is being removed; this argument is often ignored, but might be used if the UI object is stateless and shared by multiple components
    See Also:
    ComponentUI.installUI(javax.swing.JComponent), JComponent.updateUI()
  - installDefaults
    protected void installDefaults()
    
    Installs the default colors, default font, default renderer, and default editor into the JComboBox.
  - installListeners
    protected void installListeners()
    
    Creates and installs listeners for the combo box and its model. This method is called when the UI is installed.
  - uninstallDefaults
    protected void uninstallDefaults()
    
    Uninstalls the default colors, default font, default renderer, and default editor from the combo box.
  - uninstallListeners
    protected void uninstallListeners()
    
    Removes the installed listeners from the combo box and its model. The number and types of listeners removed and in this method should be the same that was added in installListeners
  - createPopup
    protected ComboPopup createPopup()
    
    Creates the popup portion of the combo box.
    
    Returns:
    an instance of ComboPopup
    See Also:
    ComboPopup
  - createKeyListener
    protected KeyListener createKeyListener()
    
    Creates a KeyListener which will be added to the combo box. If this method returns null then it will not be added to the combo box.
    
    Returns:
    an instance KeyListener or null
  - createFocusListener
    protected FocusListener createFocusListener()
    
    Creates a FocusListener which will be added to the combo box. If this method returns null then it will not be added to the combo box.
    
    Returns:
    an instance of a FocusListener or null
  - createListDataListener
    protected ListDataListener createListDataListener()
    
    Creates a list data listener which will be added to the ComboBoxModel. If this method returns null then it will not be added to the combo box model.
    
    Returns:
    an instance of a ListDataListener or null
  - createItemListener
    protected ItemListener createItemListener()
    
    Creates an ItemListener which will be added to the combo box. If this method returns null then it will not be added to the combo box.
    Subclasses may override this method to return instances of their own ItemEvent handlers.
    
    Returns:
    an instance of an ItemListener or null
  - createPropertyChangeListener
    protected PropertyChangeListener createPropertyChangeListener()
    
    Creates a PropertyChangeListener which will be added to the combo box. If this method returns null then it will not be added to the combo box.
    
    Returns:
    an instance of a PropertyChangeListener or null
  - createLayoutManager
    protected LayoutManager createLayoutManager()
    
    Creates a layout manager for managing the components which make up the combo box.
    
    Returns:
    an instance of a layout manager
  - createRenderer
    protected ListCellRenderer createRenderer()
    
    Creates the default renderer that will be used in a non-editiable combo box. A default renderer will used only if a renderer has not been explicitly set with setRenderer.
    
    Returns:
    a ListCellRender used for the combo box
    See Also:
    JComboBox.setRenderer(javax.swing.ListCellRenderer<? super E>)
  - createEditor
    protected ComboBoxEditor createEditor()
    
    Creates the default editor that will be used in editable combo boxes. A default editor will be used only if an editor has not been explicitly set with setEditor.
    
    Returns:
    a ComboBoxEditor used for the combo box
    See Also:
    JComboBox.setEditor(javax.swing.ComboBoxEditor)
  - installComponents
    protected void installComponents()
    
    Creates and initializes the components which make up the aggregate combo box. This method is called as part of the UI installation process.
  - uninstallComponents
    protected void uninstallComponents()
    
    The aggregate components which compise the combo box are unregistered and uninitialized. This method is called as part of the UI uninstallation process.
  - addEditor
    public void addEditor()
    
    This public method is implementation specific and should be private. do not call or override. To implement a specific editor create a custom ComboBoxEditor
    
    See Also:
    createEditor(), JComboBox.setEditor(javax.swing.ComboBoxEditor), ComboBoxEditor
  - removeEditor
    public void removeEditor()
    
    This public method is implementation specific and should be private. do not call or override.
    
    See Also:
    addEditor()
  - configureEditor
    protected void configureEditor()
    
    This protected method is implementation specific and should be private. do not call or override.
    
    See Also:
    addEditor()
  - unconfigureEditor
    protected void unconfigureEditor()
    
    This protected method is implementation specific and should be private. Do not call or override.
    
    See Also:
    addEditor()
  - configureArrowButton
    public void configureArrowButton()
    
    This public method is implementation specific and should be private. Do not call or override.
    
    See Also:
    createArrowButton()
  - unconfigureArrowButton
    public void unconfigureArrowButton()
    
    This public method is implementation specific and should be private. Do not call or override.
    
    See Also:
    createArrowButton()
  - createArrowButton
    protected JButton createArrowButton()
    
    Creates a button which will be used as the control to show or hide the popup portion of the combo box.
    
    Returns:
    a button which represents the popup control
  - isPopupVisible
    public boolean isPopupVisible(JComboBox c)
    
    Tells if the popup is visible or not.
    
    Specified by:
    
    isPopupVisible in class ComboBoxUI
  - setPopupVisible
    public void setPopupVisible(JComboBox c, boolean v)
    
    Hides the popup.
    
    Specified by:
    
    setPopupVisible in class ComboBoxUI
  - isFocusTraversable
    public boolean isFocusTraversable(JComboBox c)
    
    Determines if the JComboBox is focus traversable. If the JComboBox is editable this returns false, otherwise it returns true.
    
    Specified by:
    
    isFocusTraversable in class ComboBoxUI
  - paint
    public void paint(Graphics g, JComponent c)
    
    Description copied from class: ComponentUI
    
    Paints the specified component appropriately for the look and feel. This method is invoked from the ComponentUI.update method when the specified component is being painted. Subclasses should override this method and use the specified Graphics object to render the content of the component.
    
    Overrides:
    
    paint in class ComponentUI
    
    Parameters:
    g - the Graphics context in which to paint
    c - the component being painted; this argument is often ignored, but might be used if the UI object is stateless and shared by multiple components
    See Also:
    ComponentUI.update(java.awt.Graphics, javax.swing.JComponent)
  - getPreferredSize
    public Dimension getPreferredSize(JComponent c)
    
    Description copied from class: ComponentUI
    
    Returns the specified component's preferred size appropriate for the look and feel. If null is returned, the preferred size will be calculated by the component's layout manager instead (this is the preferred approach for any component with a specific layout manager installed). The default implementation of this method returns null.
    
    Overrides:
    
    getPreferredSize in class ComponentUI
    
    Parameters:
    c - the component whose preferred size is being queried; this argument is often ignored, but might be used if the UI object is stateless and shared by multiple components
    See Also:
    JComponent.getPreferredSize(), LayoutManager.preferredLayoutSize(java.awt.Container)
  - getMinimumSize
    public Dimension getMinimumSize(JComponent c)
    
    The minumum size is the size of the display area plus insets plus the button.
    
    Overrides:
    
    getMinimumSize in class ComponentUI
    
    Parameters:
    c - the component whose minimum size is being queried; this argument is often ignored, but might be used if the UI object is stateless and shared by multiple components
    
    Returns:
    a Dimension object or null
    See Also:
    JComponent.getMinimumSize(), LayoutManager.minimumLayoutSize(java.awt.Container), ComponentUI.getPreferredSize(javax.swing.JComponent)
  - getMaximumSize
    public Dimension getMaximumSize(JComponent c)
    
    Description copied from class: ComponentUI
    
    Returns the specified component's maximum size appropriate for the look and feel. If null is returned, the maximum size will be calculated by the component's layout manager instead (this is the preferred approach for any component with a specific layout manager installed). The default implementation of this method invokes getPreferredSize and returns that value.
    
    Overrides:
    
    getMaximumSize in class ComponentUI
    
    Parameters:
    c - the component whose maximum size is being queried; this argument is often ignored, but might be used if the UI object is stateless and shared by multiple components
    
    Returns:
    a Dimension object or null
    See Also:
    JComponent.getMaximumSize(), LayoutManager2.maximumLayoutSize(java.awt.Container)
  - getBaseline
    public int getBaseline(JComponent c, int width, int height)
    
    Returns the baseline.
    
    Overrides:
    
    getBaseline in class ComponentUI
    
    Parameters:
    c - JComponent baseline is being requested for
    width - the width to get the baseline for
    height - the height to get the baseline for
    
    Returns:
    baseline or a value < 0 indicating there is no reasonable baseline
    
    Throws:
    
    NullPointerException - if c is null
    
    IllegalArgumentException - if width or height is < 0
    Since:
    
    1.6
    
    See Also:
    JComponent.getBaseline(int, int)
  - getBaselineResizeBehavior
    public Component.BaselineResizeBehavior getBaselineResizeBehavior(JComponent c)
    
    Returns an enum indicating how the baseline of the component changes as the size changes.
    
    Overrides:
    
    getBaselineResizeBehavior in class ComponentUI
    
    Parameters:
    c - JComponent to return baseline resize behavior for
    
    Returns:
    an enum indicating how the baseline changes as the component size changes
    
    Throws:
    
    NullPointerException - if c is null
    Since:
    
    1.6
    
    See Also:
    JComponent.getBaseline(int, int)
  - getAccessibleChildrenCount
    public int getAccessibleChildrenCount(JComponent c)
    
    Description copied from class: ComponentUI
    
    Returns the number of accessible children in the object. If all of the children of this object implement Accessible, this method should return the number of children of this object. UIs might wish to override this if they present areas on the screen that can be viewed as components, but actual components are not used for presenting those areas. Note: As of v1.3, it is recommended that developers call Component.AccessibleAWTComponent.getAccessibleChildrenCount() instead of this method.
    
    Overrides:
    
    getAccessibleChildrenCount in class ComponentUI
    
    Returns:
    the number of accessible children in the object
    See Also:
    ComponentUI.getAccessibleChild(javax.swing.JComponent, int)
  - getAccessibleChild
    public Accessible getAccessibleChild(JComponent c, int i)
    
    Description copied from class: ComponentUI
    
    Returns the ith Accessible child of the object. UIs might need to override this if they present areas on the screen that can be viewed as components, but actual components are not used for presenting those areas.
    Note: As of v1.3, it is recommended that developers call Component.AccessibleAWTComponent.getAccessibleChild() instead of this method.
    
    Overrides:
    
    getAccessibleChild in class ComponentUI
    
    i - zero-based index of child
    
    Returns:
    the ith Accessible child of the object
    See Also:
    ComponentUI.getAccessibleChildrenCount(javax.swing.JComponent)
  - isNavigationKey
    protected boolean isNavigationKey(int keyCode)
    
    Returns whether or not the supplied keyCode maps to a key that is used for navigation. This is used for optimizing key input by only passing non- navigation keys to the type-ahead mechanism. Subclasses should override this if they change the navigation keys.
  - selectNextPossibleValue
    protected void selectNextPossibleValue()
    
    Selects the next item in the list. It won't change the selection if the currently selected item is already the last item.
  - selectPreviousPossibleValue
    protected void selectPreviousPossibleValue()
    
    Selects the previous item in the list. It won't change the selection if the currently selected item is already the first item.
  - toggleOpenClose
    protected void toggleOpenClose()
    
    Hides the popup if it is showing and shows the popup if it is hidden.
  - rectangleForCurrentValue
    protected Rectangle rectangleForCurrentValue()
    
    Returns the area that is reserved for drawing the currently selected item.
  - getInsets
    protected Insets getInsets()
    
    Gets the insets from the JComboBox.
  - paintCurrentValue
    public void paintCurrentValue(Graphics g, Rectangle bounds, boolean hasFocus)
    
    Paints the currently selected item.
  - paintCurrentValueBackground
    public void paintCurrentValueBackground(Graphics g, Rectangle bounds, boolean hasFocus)
    
    Paints the background of the currently selected item.
  - getDefaultSize
    protected Dimension getDefaultSize()
    
    Return the default size of an empty display area of the combo box using the current renderer and font.
    
    Returns:
    the size of an empty display area
    See Also:
    getDisplaySize()
  - getDisplaySize
    protected Dimension getDisplaySize()
    
    Returns the calculated size of the display area. The display area is the portion of the combo box in which the selected item is displayed. This method will use the prototype display value if it has been set.
    For combo boxes with a non trivial number of items, it is recommended to use a prototype display value to significantly speed up the display size calculation.
    
    Returns:
    the size of the display area calculated from the combo box items
    See Also:
    JComboBox.setPrototypeDisplayValue(E)
  - getSizeForComponent
    protected Dimension getSizeForComponent(Component comp)
    
    Returns the size a component would have if used as a cell renderer.
    
    Parameters:
    comp - a Component to check
    
    Returns:
    size of the component
    Since:
    
    1.7
  - installKeyboardActions
    protected void installKeyboardActions()
    
    Adds keyboard actions to the JComboBox. Actions on enter and esc are already supplied. Add more actions as you need them.
  - uninstallKeyboardActions
    protected void uninstallKeyboardActions()
    
    Removes the focus InputMap and ActionMap.

Document created the 11/06/2005, last modified the 04/03/2020
Source of the printed document:https://www.gaudry.be/en/java-api-rf-javax/swing/plaf/basic/basiccomboboxui.html

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References

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Contents Haut

Class BasicComboBoxUI

References