javax.swing.plaf.basic
Class BasicComboPopup

java.lang.Object
  |
  +--java.awt.Component
        |
        +--java.awt.Container
              |
              +--javax.swing.JComponent
                    |
                    +--javax.swing.JPopupMenu
                          |
                          +--javax.swing.plaf.basic.BasicComboPopup

Direct Known Subclasses:

MetalComboBoxUI.MetalComboPopup

public class BasicComboPopup

extends JPopupMenu

implements ComboPopup

This is an implementation of the ComboPopup interface. It is primarily for use by BasicComboBoxUI and its subclasses. BasicComboPopup extends JPopupMenu because most combo boxes use a popup menu to display the list of possible selections. BasicComboBoxUI only requires a ComboPopup, so subclasses of BasicComboBoxUI aren't required to use this class. All event handling is handled by 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. Inner classes for handling events: InvocationMouseHandler InvocationMouseMotionHandler InvocationKeyHandler ListSelectionHandler ListDataHandler ListMouseHandler ListMouseMotionHandler PropertyChangeHandler ItemHandler

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. A future release of Swing will provide support for long term persistence.

See Also:

Serialized Form

Inner Class Summary

class	BasicComboPopup.InvocationKeyHandler This listener watches for the spacebar being pressed and shows/hides the popup accordingly.
protected class	BasicComboPopup.InvocationMouseHandler This listener knows how and when to invoke this popup menu.
protected class	BasicComboPopup.InvocationMouseMotionHandler This listener watches for dragging and updates the current selection in the list if it is dragging over the list.
protected class	BasicComboPopup.ItemHandler This listener watches for changes in the JComboBox's selection.
class	BasicComboPopup.ListDataHandler Keeps the selected index in the list in-sync with the combo box's selection.
protected class	BasicComboPopup.ListMouseHandler This listener hides the popup when the mouse is released in the list.
protected class	BasicComboPopup.ListMouseMotionHandler This listener changes the selected item as you move the mouse over the list.
protected class	BasicComboPopup.ListSelectionHandler This listener watches for changes in the list's selection and reports them to the combo box.
protected class	BasicComboPopup.PropertyChangeHandler This listener watches for bound property changes in JComboBox.

Inner classes inherited from class javax.swing.JPopupMenu

JPopupMenu.AccessibleJPopupMenu, JPopupMenu.Separator

Inner classes inherited from class javax.swing.JComponent

JComponent.AccessibleJComponent

Field Summary

protected Timer	autoscrollTimer
protected JComboBox	comboBox
protected boolean	hasEntered
protected boolean	isAutoScrolling
protected ItemListener	itemListener
protected KeyListener	keyListener
protected JList	list
protected ListDataListener	listDataListener
protected MouseListener	listMouseListener
protected MouseMotionListener	listMouseMotionListener
protected ListSelectionListener	listSelectionListener
protected MouseListener	mouseListener
protected MouseMotionListener	mouseMotionListener
protected PropertyChangeListener	propertyChangeListener
protected static int	SCROLL_DOWN
protected static int	SCROLL_UP
protected int	scrollDirection
protected JScrollPane	scroller
protected boolean	valueIsAdjusting

Fields inherited from class javax.swing.JComponent

accessibleContext, listenerList, TOOL_TIP_TEXT_KEY, ui, UNDEFINED_CONDITION, WHEN_ANCESTOR_OF_FOCUSED_COMPONENT, WHEN_FOCUSED, WHEN_IN_FOCUSED_WINDOW

Fields inherited from class java.awt.Component

BOTTOM_ALIGNMENT, CENTER_ALIGNMENT, LEFT_ALIGNMENT, RIGHT_ALIGNMENT, TOP_ALIGNMENT

Constructor Summary

BasicComboPopup(JComboBox combo)

Method Summary

protected void	autoScrollDown()
protected void	autoScrollUp()
protected Rectangle	computePopupBounds(int px, int py, int pw, int ph)
protected void	configureList() Called to configure the list created by createList().
protected void	configurePopup() Called to configure this JPopupMenu (BasicComboPopup is a JPopupMenu).
protected void	configureScroller() Called to configure the JScrollPane created by createScroller().
protected MouseEvent	convertMouseEvent(MouseEvent e)
protected ItemListener	createItemListener() Creates an item listener that watches for changes in the selected item in the JComboBox.
protected KeyListener	createKeyListener() Creates the key listener that is returned by ComboPopup.getKeyListener().
protected JList	createList() Creates the JList that is used in the popup to display the items in the model.
protected ListDataListener	createListDataListener() Creates a list data listener that watches for inserted and removed items from the combo box model.
protected MouseListener	createListMouseListener() Creates a mouse listener that watches for mouse events in the popup's list.
protected MouseMotionListener	createListMouseMotionListener() Creates a mouse motion listener that watches for mouse events in the popup's list.
protected ListSelectionListener	createListSelectionListener() Creates a list selection listener that watches for selection changes in the popup's list.
protected MouseListener	createMouseListener() Creates the mouse listener that is returned by ComboPopup.getMouseListener().
protected MouseMotionListener	createMouseMotionListener() Creates the mouse motion listener that is returned by ComboPopup.getMouseMotionListener().
protected PropertyChangeListener	createPropertyChangeListener() Creates a property change listener that watches for changes in the bound properties in the JComboBox.
protected JScrollPane	createScroller() Creates the JScrollPane that is used in the popup to hold the list.
protected void	delegateFocus(MouseEvent e) This is is a utility method that helps event handlers figure out where to send the focus when the popup is brought up.
KeyListener	getKeyListener() Implementation of ComboPopup.getKeyListener().
JList	getList() Implementation of ComboPopup.getList().
MouseListener	getMouseListener() Implementation of ComboPopup.getMouseListener().
MouseMotionListener	getMouseMotionListener() Implementation of ComboPopup.getMouseMotionListener().
protected int	getPopupHeightForRowCount(int maxRowCount)
void	hide() Implementation of ComboPopup.hide().
protected void	installComboBoxListeners() This method adds the necessary listeners to the JComboBox.
protected void	installComboBoxModelListeners(ComboBoxModel model)
protected void	installKeyboardActions()
protected void	installListListeners() Called by configureList() to add the necessary listeners to the list.
boolean	isFocusTraversable() Overridden to unconditionally return false.
void	show() Implementation of ComboPopup.show().
protected void	startAutoScrolling(int direction) Called by BasicComboPopup$InvocationMouseMotionHandler to handle auto- scrolling the list.
protected void	stopAutoScrolling()
protected void	togglePopup() Makes the popup visible if it is hidden and makes it hidden if it is visible.
protected void	uninstallComboBoxModelListeners(ComboBoxModel model)
void	uninstallingUI() Called when the UI is uninstalling.
protected void	uninstallKeyboardActions()
protected void	updateListBoxSelectionForEvent(MouseEvent anEvent, boolean shouldScroll) A utility method used by the event listeners.

Methods inherited from class javax.swing.JPopupMenu

add, add, add, addPopupMenuListener, addSeparator, createActionChangeListener, firePopupMenuCanceled, firePopupMenuWillBecomeInvisible, firePopupMenuWillBecomeVisible, getAccessibleContext, getComponent, getComponentAtIndex, getComponentIndex, getDefaultLightWeightPopupEnabled, getInvoker, getLabel, getMargin, getSelectionModel, getSubElements, getUI, getUIClassID, insert, insert, isBorderPainted, isLightWeightPopupEnabled, isVisible, menuSelectionChanged, pack, paintBorder, paramString, processKeyEvent, processMouseEvent, remove, remove, removePopupMenuListener, setBorderPainted, setDefaultLightWeightPopupEnabled, setInvoker, setLabel, setLightWeightPopupEnabled, setLocation, setPopupSize, setPopupSize, setSelected, setSelectionModel, setUI, setVisible, show, updateUI

Methods inherited from class javax.swing.JComponent

addAncestorListener, addNotify, addPropertyChangeListener, addPropertyChangeListener, addVetoableChangeListener, computeVisibleRect, contains, createToolTip, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, fireVetoableChange, getActionForKeyStroke, getAlignmentX, getAlignmentY, getAutoscrolls, getBorder, getBounds, getClientProperty, getComponentGraphics, getConditionForKeyStroke, getDebugGraphicsOptions, getGraphics, getHeight, getInsets, getInsets, getLocation, getMaximumSize, getMinimumSize, getNextFocusableComponent, getPreferredSize, getRegisteredKeyStrokes, getRootPane, getSize, getToolTipLocation, getToolTipText, getToolTipText, getTopLevelAncestor, getVisibleRect, getWidth, getX, getY, grabFocus, hasFocus, isDoubleBuffered, isFocusCycleRoot, isLightweightComponent, isManagingFocus, isOpaque, isOptimizedDrawingEnabled, isPaintingTile, isRequestFocusEnabled, isValidateRoot, paint, paintChildren, paintComponent, paintImmediately, paintImmediately, processComponentKeyEvent, processFocusEvent, processKeyEvent, processMouseMotionEvent, putClientProperty, registerKeyboardAction, registerKeyboardAction, removeAncestorListener, removeNotify, removePropertyChangeListener, removePropertyChangeListener, removeVetoableChangeListener, repaint, repaint, requestDefaultFocus, requestFocus, resetKeyboardActions, reshape, revalidate, scrollRectToVisible, setAlignmentX, setAlignmentY, setAutoscrolls, setBackground, setBorder, setDebugGraphicsOptions, setDoubleBuffered, setEnabled, setFont, setForeground, setMaximumSize, setMinimumSize, setNextFocusableComponent, setOpaque, setPreferredSize, setRequestFocusEnabled, setToolTipText, setUI, unregisterKeyboardAction, update

Methods inherited from class java.awt.Container

add, add, add, add, add, addContainerListener, addImpl, countComponents, deliverEvent, doLayout, findComponentAt, findComponentAt, getComponent, getComponentAt, getComponentAt, getComponentCount, getComponents, getLayout, insets, invalidate, isAncestorOf, layout, list, list, locate, minimumSize, paintComponents, preferredSize, print, printComponents, processContainerEvent, processEvent, removeAll, removeContainerListener, setCursor, setLayout, validate, validateTree

Methods inherited from class java.awt.Component

action, add, addComponentListener, addFocusListener, addInputMethodListener, addKeyListener, addMouseListener, addMouseMotionListener, bounds, checkImage, checkImage, coalesceEvents, contains, createImage, createImage, disable, disableEvents, dispatchEvent, enable, enable, enableEvents, enableInputMethods, getBackground, getBounds, getColorModel, getComponentOrientation, getCursor, getDropTarget, getFont, getFontMetrics, getForeground, getInputContext, getInputMethodRequests, getLocale, getLocation, getLocationOnScreen, getName, getParent, getPeer, getSize, getToolkit, getTreeLock, gotFocus, handleEvent, imageUpdate, inside, isDisplayable, isEnabled, isLightweight, isShowing, isValid, keyDown, keyUp, list, list, list, location, lostFocus, mouseDown, mouseDrag, mouseEnter, mouseExit, mouseMove, mouseUp, move, nextFocus, paintAll, postEvent, prepareImage, prepareImage, printAll, processComponentEvent, processInputMethodEvent, processMouseEvent, remove, removeComponentListener, removeFocusListener, removeInputMethodListener, removeKeyListener, removeMouseListener, removeMouseMotionListener, repaint, repaint, repaint, resize, resize, setBounds, setBounds, setComponentOrientation, setDropTarget, setLocale, setLocation, setName, setSize, setSize, show, size, toString, transferFocus

Methods inherited from class java.lang.Object

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

Field Detail

comboBox

protected JComboBox comboBox

list

protected JList list

scroller

protected JScrollPane scroller

valueIsAdjusting

protected boolean valueIsAdjusting

mouseMotionListener

protected MouseMotionListener mouseMotionListener

mouseListener

protected MouseListener mouseListener

keyListener

protected KeyListener keyListener

listSelectionListener

protected ListSelectionListener listSelectionListener

listDataListener

protected ListDataListener listDataListener

listMouseListener

protected MouseListener listMouseListener

listMouseMotionListener

protected MouseMotionListener listMouseMotionListener

propertyChangeListener

protected PropertyChangeListener propertyChangeListener

itemListener

protected ItemListener itemListener

autoscrollTimer

protected Timer autoscrollTimer

hasEntered

protected boolean hasEntered

isAutoScrolling

protected boolean isAutoScrolling

scrollDirection

protected int scrollDirection

SCROLL_UP

protected static final int SCROLL_UP

SCROLL_DOWN

protected static final int SCROLL_DOWN

Constructor Detail

BasicComboPopup

public BasicComboPopup(JComboBox combo)

Method Detail

show

public void show()

Implementation of ComboPopup.show().

Specified by:

show in interface ComboPopup

Overrides:

show in class Component

hide

public void hide()

Implementation of ComboPopup.hide().

Specified by:

hide in interface ComboPopup

Overrides:

hide in class Component

getList

public JList getList()

Implementation of ComboPopup.getList().

Specified by:

getList in interface ComboPopup

getMouseListener

public MouseListener getMouseListener()

Implementation of ComboPopup.getMouseListener().

Specified by:

getMouseListener in interface ComboPopup

getMouseMotionListener

public MouseMotionListener getMouseMotionListener()

Implementation of ComboPopup.getMouseMotionListener().

Specified by:

getMouseMotionListener in interface ComboPopup

getKeyListener

public KeyListener getKeyListener()

Implementation of ComboPopup.getKeyListener().

Specified by:

getKeyListener in interface ComboPopup

uninstallingUI

public void uninstallingUI()

Called when the UI is uninstalling. Since this popup isn't in the component tree, it won't get it's uninstallUI() called. It removes the listeners that were added in addComboBoxListeners().

Specified by:

uninstallingUI in interface ComboPopup

uninstallComboBoxModelListeners

protected void uninstallComboBoxModelListeners(ComboBoxModel model)

uninstallKeyboardActions

protected void uninstallKeyboardActions()

createMouseListener

protected MouseListener createMouseListener()

Creates the mouse listener that is returned by ComboPopup.getMouseListener(). Returns an instance of BasicComboPopup$InvocationMouseHandler.

createMouseMotionListener

protected MouseMotionListener createMouseMotionListener()

Creates the mouse motion listener that is returned by ComboPopup.getMouseMotionListener(). Returns an instance of BasicComboPopup$InvocationMouseMotionListener.

createKeyListener

protected KeyListener createKeyListener()

Creates the key listener that is returned by ComboPopup.getKeyListener(). Returns an instance of BasicComboPopup$InvocationKeyHandler.

createListSelectionListener

protected ListSelectionListener createListSelectionListener()

Creates a list selection listener that watches for selection changes in the popup's list. Returns an instance of BasicComboPopup$ListSelectionHandler.

createListDataListener

protected ListDataListener createListDataListener()

Creates a list data listener that watches for inserted and removed items from the combo box model.

createListMouseListener

protected MouseListener createListMouseListener()

Creates a mouse listener that watches for mouse events in the popup's list. Returns an instance of BasicComboPopup$ListMouseHandler.

createListMouseMotionListener

protected MouseMotionListener createListMouseMotionListener()

Creates a mouse motion listener that watches for mouse events in the popup's list. Returns an instance of BasicComboPopup$ListMouseMotionHandler.

createPropertyChangeListener

protected PropertyChangeListener createPropertyChangeListener()

Creates a property change listener that watches for changes in the bound properties in the JComboBox. Returns an instance of BasicComboPopup$PropertyChangeHandler.

createItemListener

protected ItemListener createItemListener()

Creates an item listener that watches for changes in the selected item in the JComboBox. Returns an instance of BasicComboPopup$ItemHandler.

createList

protected JList createList()

Creates the JList that is used in the popup to display the items in the model.

configureList

protected void configureList()

Called to configure the list created by createList().

installListListeners

protected void installListListeners()

Called by configureList() to add the necessary listeners to the list.

createScroller

protected JScrollPane createScroller()

Creates the JScrollPane that is used in the popup to hold the list.

configureScroller

protected void configureScroller()

Called to configure the JScrollPane created by createScroller().

configurePopup

protected void configurePopup()

Called to configure this JPopupMenu (BasicComboPopup is a JPopupMenu).

installComboBoxListeners

protected void installComboBoxListeners()

This method adds the necessary listeners to the JComboBox.

installComboBoxModelListeners

protected void installComboBoxModelListeners(ComboBoxModel model)

installKeyboardActions

protected void installKeyboardActions()

isFocusTraversable

public boolean isFocusTraversable()

Overridden to unconditionally return false.

Overrides:

isFocusTraversable in class JComponent

Tags copied from class: JComponent

Returns:

true if this component can receive the focus

startAutoScrolling

protected void startAutoScrolling(int direction)

Called by BasicComboPopup$InvocationMouseMotionHandler to handle auto- scrolling the list.

stopAutoScrolling

protected void stopAutoScrolling()

autoScrollUp

protected void autoScrollUp()

autoScrollDown

protected void autoScrollDown()

delegateFocus

protected void delegateFocus(MouseEvent e)

This is is a utility method that helps event handlers figure out where to send the focus when the popup is brought up. The standard implementation delegates the focus to the editor (if the combo box is editable) or to the JComboBox if it is not editable.

togglePopup

protected void togglePopup()

Makes the popup visible if it is hidden and makes it hidden if it is visible.

convertMouseEvent

protected MouseEvent convertMouseEvent(MouseEvent e)

getPopupHeightForRowCount

protected int getPopupHeightForRowCount(int maxRowCount)

computePopupBounds

protected Rectangle computePopupBounds(int px,
                                       int py,
                                       int pw,
                                       int ph)

updateListBoxSelectionForEvent

protected void updateListBoxSelectionForEvent(MouseEvent anEvent,
                                              boolean shouldScroll)

A utility method used by the event listeners. Given a mouse event, it changes the list selection to the list item below the mouse.