Java javax.swing.plaf.metal Class MetalComboBoxUI（JDK8）

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Java™ Platform
Standard Ed. 8

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Method

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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 and 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 javax.swing.plaf.basic.BasicComboBoxUI
BasicComboBoxUI.ComboBoxLayoutManager, BasicComboBoxUI.FocusHandler, BasicComboBoxUI.ItemHandler, BasicComboBoxUI.KeyHandler, BasicComboBoxUI.ListDataHandler, BasicComboBoxUI.PropertyChangeHandler

Field Summary
- Fields inherited from class javax.swing.plaf.basic.BasicComboBoxUI
  arrowButton, cachedMinimumSize, comboBox, currentValuePane, editor, focusListener, hasFocus, isMinimumSizeDirty, itemListener, keyListener, listBox, listDataListener, padding, popup, popupKeyListener, popupMouseListener, popupMouseMotionListener, propertyChangeListener, squareButton

Constructor Summary

Constructors

Constructor and Description

MetalComboBoxUI()

Method Summary

All Methods Static Methods Instance Methods Concrete Methods Deprecated Methods
Modifier and Type	Method and Description
`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 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)`
`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)`
`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 javax.swing.plaf.ComponentUI
contains, update

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

- Constructor Detail
  - MetalComboBoxUI
```
public MetalComboBoxUI()
```
- Method Detail
  - createUI
```
public static ComponentUI createUI(JComponent c)
```
  - 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(java.awt.Graphics, javax.swing.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(javax.swing.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.
  - 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)
```
  - 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(java.awt.Container), ComponentUI.getPreferredSize(javax.swing.JComponent)

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Java™ Platform
Standard Ed. 8

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Java javax.swing.plaf.metal Class MetalComboBoxUI（JDK8）

Class MetalComboBoxUI

Nested Class Summary

Nested classes/interfaces inherited from class javax.swing.plaf.basic.BasicComboBoxUI

Field Summary

Fields inherited from class javax.swing.plaf.basic.BasicComboBoxUI

Constructor Summary

Method Summary

Methods inherited from class javax.swing.plaf.basic.BasicComboBoxUI

Methods inherited from class javax.swing.plaf.ComponentUI

Methods inherited from class java.lang.Object

Constructor Detail

MetalComboBoxUI

Method Detail

createUI

paint

paintCurrentValue

paintCurrentValueBackground

getBaseline

createEditor

createPopup

createArrowButton

createPropertyChangeListener

editablePropertyChanged

createLayoutManager

layoutComboBox

removeListeners

configureEditor

unconfigureEditor

getMinimumSize