Class MetalComboBoxUI

java.lang.Object

javax.swing.plaf.ComponentUI

javax.swing.plaf.ComboBoxUI

javax.swing.plaf.basic.BasicComboBoxUI

javax.swing.plaf.metal.MetalComboBoxUI

public class MetalComboBoxUI
extends BasicComboBoxUI

Metal UI for JComboBox

Warning: Serialized objects of this class will not be compatible with future Swing releases. The current serialization support is appropriate for short term storage or RMI between applications running the same version of Swing. As of 1.4, support for long term storage of all JavaBeans has been added to the java.beans package. Please see XMLEncoder.

See Also:

• MetalComboBoxEditor
• MetalComboBoxButton

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
class	MetalComboBoxUI.MetalComboBoxLayoutManager	This class should be treated as a "protected" inner class.
class	MetalComboBoxUI.MetalComboPopup	Deprecated. As of Java 2 platform v1.4.
class	MetalComboBoxUI.MetalPropertyChangeListener	This class should be treated as a "protected" inner class.

Nested classes/interfaces inherited from class BasicComboBoxUI

BasicComboBoxUI.ComboBoxLayoutManager, BasicComboBoxUI.FocusHandler, BasicComboBoxUI.ItemHandler, BasicComboBoxUI.KeyHandler, BasicComboBoxUI.ListDataHandler, BasicComboBoxUI.PropertyChangeHandler

Field Summary

Fields inherited from class BasicComboBoxUI

arrowButton, cachedMinimumSize, comboBox, currentValuePane, editor, focusListener, hasFocus, isMinimumSizeDirty, itemListener, keyListener, listBox, listDataListener, padding, popup, popupKeyListener, popupMouseListener, popupMouseMotionListener, propertyChangeListener, squareButton

Constructor Summary

Constructors

Constructor	Description
MetalComboBoxUI()	Constructs a MetalComboBoxUI.

Method Summary

Modifier and Type	Method	Description
void	configureEditor()	This protected method is implementation specific and should be private. do not call or override.
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 LayoutManager	createLayoutManager()	Creates a layout manager for managing the components which make up the combo box.
protected ComboPopup	createPopup()	Creates the popup portion of the combo box.
PropertyChangeListener	createPropertyChangeListener()	Creates a PropertyChangeListener which will be added to the combo box.
static ComponentUI	createUI(JComponent c)	Constructs an instance of MetalComboBoxUI.
protected void	editablePropertyChanged(PropertyChangeEvent e)	Deprecated. As of Java 2 platform v1.4.
int	getBaseline(JComponent c, int width, int height)	Returns the baseline.
Dimension	getMinimumSize(JComponent c)	The minimum size is the size of the display area plus insets plus the button.
void	layoutComboBox(Container parent, MetalComboBoxUI.MetalComboBoxLayoutManager manager)	Lays out the JComboBox in the parent container.
void	paint(Graphics g, JComponent c)	Paints the specified component appropriately for the look and feel.
void	paintCurrentValue(Graphics g, Rectangle bounds, boolean hasFocus)	If necessary paints the currently selected item.
void	paintCurrentValueBackground(Graphics g, Rectangle bounds, boolean hasFocus)	If necessary paints the background of the currently selected item.
protected void	removeListeners()	Deprecated. As of Java 2 platform v1.4.
void	unconfigureEditor()	This protected method is implementation specific and should be private.

Methods inherited from class BasicComboBoxUI

addEditor, configureArrowButton, createFocusListener, createItemListener, createKeyListener, createListDataListener, createRenderer, getAccessibleChild, getAccessibleChildrenCount, getBaselineResizeBehavior, getDefaultSize, getDisplaySize, getInsets, getMaximumSize, getPreferredSize, getSizeForComponent, installComponents, installDefaults, installKeyboardActions, installListeners, installUI, isFocusTraversable, isNavigationKey, isPopupVisible, rectangleForCurrentValue, removeEditor, selectNextPossibleValue, selectPreviousPossibleValue, setPopupVisible, toggleOpenClose, unconfigureArrowButton, uninstallComponents, uninstallDefaults, uninstallKeyboardActions, uninstallListeners, uninstallUI

Methods inherited from class ComponentUI

contains, update

Methods inherited from class Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

MetalComboBoxUI

public MetalComboBoxUI()

Constructs a MetalComboBoxUI.

Method Details

createUI

public static ComponentUI createUI(JComponent c)

Constructs an instance of MetalComboBoxUI.

Parameters:

c - a component

Returns:

an instance of MetalComboBoxUI

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 BasicComboBoxUI

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(Graphics, JComponent)

paintCurrentValue

public void paintCurrentValue(Graphics g,
 Rectangle bounds,
 boolean hasFocus)

If necessary paints the currently selected item.

Overrides:

paintCurrentValue in class BasicComboBoxUI

Parameters:

g - Graphics to paint to

bounds - Region to paint current value to

hasFocus - whether or not the JComboBox has focus

Throws:

NullPointerException - if any of the arguments are null.

Since:

1.5

paintCurrentValueBackground

public void paintCurrentValueBackground(Graphics g,
 Rectangle bounds,
 boolean hasFocus)

If necessary paints the background of the currently selected item.

Overrides:

paintCurrentValueBackground in class BasicComboBoxUI

Parameters:

g - Graphics to paint to

bounds - Region to paint background to

hasFocus - whether or not the JComboBox has focus

Throws:

NullPointerException - if any of the arguments are null.

Since:

1.5

getBaseline

public int getBaseline(JComponent c,
 int width,
 int height)

Returns the baseline.

Overrides:

getBaseline in class BasicComboBoxUI

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)

createEditor

protected ComboBoxEditor createEditor()

Description copied from class: BasicComboBoxUI

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.

Overrides:

createEditor in class BasicComboBoxUI

Returns:

a ComboBoxEditor used for the combo box

See Also:

• JComboBox.setEditor(ComboBoxEditor)

createPopup

protected ComboPopup createPopup()

Description copied from class: BasicComboBoxUI

Creates the popup portion of the combo box.

Overrides:

createPopup in class BasicComboBoxUI

Returns:

an instance of ComboPopup

See Also:

• ComboPopup

createArrowButton

protected JButton createArrowButton()

Description copied from class: BasicComboBoxUI

Creates a button which will be used as the control to show or hide the popup portion of the combo box.

Overrides:

createArrowButton in class BasicComboBoxUI

Returns:

a button which represents the popup control

createPropertyChangeListener

public PropertyChangeListener createPropertyChangeListener()

Description copied from class: BasicComboBoxUI

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.

Overrides:

createPropertyChangeListener in class BasicComboBoxUI

Returns:

an instance of a PropertyChangeListener or null

editablePropertyChanged

@Deprecated
protected void editablePropertyChanged(PropertyChangeEvent e)

Deprecated.

As of Java 2 platform v1.4.

As of Java 2 platform v1.4 this method is no longer used. Do not call or override. All the functionality of this method is in the MetalPropertyChangeListener.

Parameters:

e - an instance of PropertyChangeEvent

createLayoutManager

protected LayoutManager createLayoutManager()

Description copied from class: BasicComboBoxUI

Creates a layout manager for managing the components which make up the combo box.

Overrides:

createLayoutManager in class BasicComboBoxUI

Returns:

an instance of a layout manager

layoutComboBox

public void layoutComboBox(Container parent,
 MetalComboBoxUI.MetalComboBoxLayoutManager manager)

Lays out the JComboBox in the parent container.

Parameters:

parent - a container

manager - an instance of MetalComboBoxLayoutManager

removeListeners

@Deprecated
protected void removeListeners()

Deprecated.

As of Java 2 platform v1.4.

As of Java 2 platform v1.4 this method is no longer used.

configureEditor

public void configureEditor()

Description copied from class: BasicComboBoxUI

This protected method is implementation specific and should be private. do not call or override.

Overrides:

configureEditor in class BasicComboBoxUI

See Also:

• BasicComboBoxUI.addEditor()

unconfigureEditor

public void unconfigureEditor()

Description copied from class: BasicComboBoxUI

This protected method is implementation specific and should be private. Do not call or override.

Overrides:

unconfigureEditor in class BasicComboBoxUI

See Also:

• BasicComboBoxUI.addEditor()

getMinimumSize

public Dimension getMinimumSize(JComponent c)

Description copied from class: BasicComboBoxUI

The minimum size is the size of the display area plus insets plus the button.

Overrides:

getMinimumSize in class BasicComboBoxUI

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(Container)
• ComponentUI.getPreferredSize(JComponent)