OpenJDK 27 · javax.swing.plaf.basic.BasicComboBoxUI · APIdia, the JavaDoc alternative

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

Field Summary

Modifier and Type	Field and Description
protected JButton	arrowButton The arrow button that invokes the popup.
private Dimension	cachedDisplaySize
protected Dimension	cachedMinimumSize The cached minimum preferred size.
private static final ListCellRenderer<Object>	CELL_RENDERER
protected JComboBox<Object>	comboBox The instance of `JComboBox`.
protected CellRendererPane	currentValuePane Used to render the currently selected item in the combo box.
protected Component	editor The Component that the `ComboBoxEditor` uses for editing.
protected FocusListener	focusListener This protected field is implementation specific.
private BasicComboBoxUI.Handler	handler Implements all the Listeners needed by this class, all existing listeners redirect to it.
protected boolean	hasFocus This protected field is implementation specific.
pack-priv static final StringBuffer	HIDE_POPUP_KEY
private static final String	IS_TABLE_CELL_EDITOR
private boolean	isDisplaySizeDirty
protected boolean	isMinimumSizeDirty The flag for recalculating the minimum preferred size.
private boolean	isTableCellEditor
protected ItemListener	itemListener This protected field is implementation specific.
protected KeyListener	keyListener This protected field is implementation specific.
pack-priv JComboBox.KeySelectionManager	keySelectionManager The default key selection manager
private long	lastTime This is tricky, this variables is needed for DefaultKeySelectionManager to take into account time factor.
protected JList<Object>	listBox This list is for drawing the current item in the combo box.
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 The implementation of `ComboPopup` that is used to show the popup.
protected KeyListener	popupKeyListener The `KeyListener` listens to events.
protected MouseListener	popupMouseListener The `MouseListener` listens to events.
protected MouseMotionListener	popupMouseMotionListener The `MouseMotionListener` listens to events.
protected PropertyChangeListener	propertyChangeListener This protected field is implementation specific.
private boolean	sameBaseline Whether or not all cells have the same baseline.
protected boolean	squareButton Indicates whether or not the combo box button should be square.
private long	time
private long	timeFactor The time factor to treat the series of typed alphanumeric key as prefix for first letter navigation.

Access	Constructor and Description
public	BasicComboBoxUI() Constructs a `BasicComboBoxUI`.

Method Summary

Modifier and Type	Method and Description
public void	addEditor() This public method is implementation specific and should be private.
public 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	Returns: a button which represents the popup control createArrowButton() Creates a button which will be used as the control to show or hide the popup portion of the combo box.
protected ComboBoxEditor	Returns: a `ComboBoxEditor` used for the combo box createEditor() Creates the default editor that will be used in editable combo boxes.
protected FocusListener	Returns: an instance of a `FocusListener` or null createFocusListener() Creates a `FocusListener` which will be added to the combo box.
protected ItemListener	Returns: an instance of an `ItemListener` or null createItemListener() Creates an `ItemListener` which will be added to the combo box.
protected KeyListener	Returns: an instance `KeyListener` or null createKeyListener() Creates a `KeyListener` which will be added to the combo box.
protected LayoutManager	Returns: an instance of a layout manager createLayoutManager() Creates a layout manager for managing the components which make up the combo box.
protected ListDataListener	Returns: an instance of a `ListDataListener` or null createListDataListener() Creates a list data listener which will be added to the `ComboBoxModel`.
protected ComboPopup	Returns: an instance of `ComboPopup` createPopup() Creates the popup portion of the combo box.
protected PropertyChangeListener	Returns: an instance of a `PropertyChangeListener` or null createPropertyChangeListener() Creates a `PropertyChangeListener` which will be added to the combo box.
protected ListCellRenderer<Object>	Returns: a `ListCellRender` used for the combo box createRenderer() Creates the default renderer that will be used in a non-editiable combo box.
public static ComponentUI	Returns: a new instance of `BasicComboBoxUI` createUI(JComponent a component c) Hides javax.swing.plaf.ComponentUI.createUI. Constructs a new instance of `BasicComboBoxUI`.
public Accessible	getAccessibleChild(JComponent c, int i) Overrides javax.swing.plaf.ComponentUI.getAccessibleChild. Returns the `i`th `Accessible` child of the object.
public int	getAccessibleChildrenCount(JComponent c) Overrides javax.swing.plaf.ComponentUI.getAccessibleChildrenCount. Returns the number of accessible children in the object.
public int	getBaseline(JComponent c, int width, int height) Overrides javax.swing.plaf.ComponentUI.getBaseline. Returns the baseline.
public Component.BaselineResizeBehavior	getBaselineResizeBehavior(JComponent c) Overrides javax.swing.plaf.ComponentUI.getBaselineResizeBehavior. Returns an enum indicating how the baseline of the component changes as the size changes.
private static ListCellRenderer<Object>	getDefaultListCellRenderer()
protected Dimension	Returns: the size of an empty display area getDefaultSize() Return the default size of an empty display area of the combo box using the current renderer and font.
protected Dimension	Returns: the size of the display area calculated from the combo box items getDisplaySize() Returns the calculated size of the display area.
private BasicComboBoxUI.Handler	getHandler() Returns the shared listener.
pack-priv InputMap	getInputMap(int condition)
protected Insets	Returns: the insets getInsets() Gets the insets from the JComboBox.
public Dimension	getMaximumSize(JComponent c) Overrides javax.swing.plaf.ComponentUI.getMaximumSize. Returns the specified component's maximum size appropriate for the look and feel.
public Dimension	getMinimumSize(JComponent c) Overrides javax.swing.plaf.ComponentUI.getMinimumSize. The minimum size is the size of the display area plus insets plus the button.
public Dimension	getPreferredSize(JComponent c) Overrides javax.swing.plaf.ComponentUI.getPreferredSize. Returns the specified component's preferred size appropriate for the look and feel.
protected Dimension	Returns: size of the component getSizeForComponent(Component a `Component` to check 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.
public void	installUI(JComponent c) Overrides javax.swing.plaf.ComponentUI.installUI. Configures the specified component appropriately for the look and feel.
public boolean	isFocusTraversable(JComboBox<?> c) Implements abstract javax.swing.plaf.ComboBoxUI.isFocusTraversable. Determines if the JComboBox is focus traversable.
protected boolean	Returns: `true` if the supplied `keyCode` maps to a navigation key isNavigationKey(int a key code keyCode) Returns whether or not the supplied keyCode maps to a key that is used for navigation.
private boolean	isNavigationKey(int keyCode, int modifiers)
public boolean	isPopupVisible(JComboBox<?> c) Implements abstract javax.swing.plaf.ComboBoxUI.isPopupVisible. Tells if the popup is visible or not.
pack-priv boolean	isTableCellEditor()
pack-priv static void	loadActionMap(LazyActionMap map) Populates ComboBox's actions.
public void	paint(Graphics g, JComponent c) Overrides javax.swing.plaf.ComponentUI.paint. Paints the specified component appropriately for the look and feel.
public void	paintCurrentValue(Graphics an instance of `Graphics` g, Rectangle a bounding rectangle to render to bounds, boolean is focused hasFocus) Paints the currently selected item.
public void	paintCurrentValueBackground(Graphics an instance of `Graphics` g, Rectangle a bounding rectangle to render to bounds, boolean is focused hasFocus) Paints the background of the currently selected item.
protected Rectangle	Returns: the area that is reserved for drawing the currently selected item rectangleForCurrentValue() Returns the area that is reserved for drawing the currently selected item.
public void	removeEditor() This public method is implementation specific and should be private.
pack-priv void	repaintCurrentValue() Repaint the currently selected item.
protected void	selectNextPossibleValue() Selects the next item in the list.
protected void	selectPreviousPossibleValue() Selects the previous item in the list.
public void	setPopupVisible(JComboBox<?> c, boolean v) Implements abstract javax.swing.plaf.ComboBoxUI.setPopupVisible. Hides the popup.
protected void	toggleOpenClose() Hides the popup if it is showing and shows the popup if it is hidden.
public 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 comprise 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.
public void	uninstallUI(JComponent c) Overrides javax.swing.plaf.ComponentUI.uninstallUI. Reverses configuration which was done on the specified component during `installUI`.
private void	updateToolTipTextForChildren()

public Class BasicComboBoxUI

Nested and Inner Type Summary

Field Summary

Constructor Summary

Method Summary