Back to index...

	/*
	* Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
	*
	* This code is free software; you can redistribute it and/or modify it
	* under the terms of the GNU General Public License version 2 only, as
	* published by the Free Software Foundation. Oracle designates this
	* particular file as subject to the "Classpath" exception as provided
	* by Oracle in the LICENSE file that accompanied this code.
	*
	* This code is distributed in the hope that it will be useful, but WITHOUT
	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
	* version 2 for more details (a copy is included in the LICENSE file that
	* accompanied this code).
	*
	* You should have received a copy of the GNU General Public License version
	* 2 along with this work; if not, write to the Free Software Foundation,
	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
	*
	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
	* or visit www.oracle.com if you need additional information or have any
	* questions.
	*/
	package javax.swing;

	import java.util.EventListener;
	import java.awt.*;
	import java.awt.event.*;
	import java.awt.image.*;

	import java.beans.PropertyChangeEvent;
	import java.beans.PropertyChangeListener;

	import java.io.Serializable;
	import java.io.ObjectOutputStream;
	import java.io.ObjectInputStream;
	import java.io.IOException;

	import javax.swing.plaf.*;
	import javax.swing.plaf.basic.*;
	import javax.swing.event.*;
	import javax.accessibility.*;

	/**
	* An implementation of an item in a menu. A menu item is essentially a button
	* sitting in a list. When the user selects the "button", the action
	* associated with the menu item is performed. A <code>JMenuItem</code>
	* contained in a <code>JPopupMenu</code> performs exactly that function.
	* <p>
	* Menu items can be configured, and to some degree controlled, by
	* <code><a href="Action.html">Action</a></code>s. Using an
	* <code>Action</code> with a menu item has many benefits beyond directly
	* configuring a menu item. Refer to <a href="Action.html#buttonActions">
	* Swing Components Supporting <code>Action</code></a> for more
	* details, and you can find more information in <a
	* href="https://docs.oracle.com/javase/tutorial/uiswing/misc/action.html">How
	* to Use Actions</a>, a section in <em>The Java Tutorial</em>.
	* <p>
	* For further documentation and for examples, see
	* <a
	href="https://docs.oracle.com/javase/tutorial/uiswing/components/menu.html">How to Use Menus</a>
	* in <em>The Java Tutorial.</em>
	* <p>
	* <strong>Warning:</strong> Swing is not thread safe. For more
	* information see <a
	* href="package-summary.html#threading">Swing's Threading
	* Policy</a>.
	* <p>
	* <strong>Warning:</strong>
	* 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 <code>java.beans</code> package.
	* Please see {@link java.beans.XMLEncoder}.
	*
	* @beaninfo
	* attribute: isContainer false
	* description: An item which can be selected in a menu.
	*
	* @author Georges Saab
	* @author David Karlton
	* @see JPopupMenu
	* @see JMenu
	* @see JCheckBoxMenuItem
	* @see JRadioButtonMenuItem
	*/
	@SuppressWarnings("serial")
	public class JMenuItem extends AbstractButton implements Accessible,MenuElement {

	/**
	* @see #getUIClassID
	* @see #readObject
	*/
	private static final String uiClassID = "MenuItemUI";

	/* diagnostic aids -- should be false for production builds. */
	private static final boolean TRACE = false; // trace creates and disposes
	private static final boolean VERBOSE = false; // show reuse hits/misses
	private static final boolean DEBUG = false; // show bad params, misc.

	private boolean isMouseDragged = false;

	/**
	* Creates a <code>JMenuItem</code> with no set text or icon.
	*/
	public JMenuItem() {
	this(null, (Icon)null);
	}

	/**
	* Creates a <code>JMenuItem</code> with the specified icon.
	*
	* @param icon the icon of the <code>JMenuItem</code>
	*/
	public JMenuItem(Icon icon) {
	this(null, icon);
	}

	/**
	* Creates a <code>JMenuItem</code> with the specified text.
	*
	* @param text the text of the <code>JMenuItem</code>
	*/
	public JMenuItem(String text) {
	this(text, (Icon)null);
	}

	/**
	* Creates a menu item whose properties are taken from the
	* specified <code>Action</code>.
	*
	* @param a the action of the <code>JMenuItem</code>
	* @since 1.3
	*/
	public JMenuItem(Action a) {
	this();
	setAction(a);
	}

	/**
	* Creates a <code>JMenuItem</code> with the specified text and icon.
	*
	* @param text the text of the <code>JMenuItem</code>
	* @param icon the icon of the <code>JMenuItem</code>
	*/
	public JMenuItem(String text, Icon icon) {
	setModel(new DefaultButtonModel());
	init(text, icon);
	initFocusability();
	}

	/**
	* Creates a <code>JMenuItem</code> with the specified text and
	* keyboard mnemonic.
	*
	* @param text the text of the <code>JMenuItem</code>
	* @param mnemonic the keyboard mnemonic for the <code>JMenuItem</code>
	*/
	public JMenuItem(String text, int mnemonic) {
	setModel(new DefaultButtonModel());
	init(text, null);
	setMnemonic(mnemonic);
	initFocusability();
	}

	/**
	* {@inheritDoc}
	*/
	public void setModel(ButtonModel newModel) {
	super.setModel(newModel);
	if(newModel instanceof DefaultButtonModel) {
	((DefaultButtonModel)newModel).setMenuItem(true);
	}
	}

	/**
	* Inititalizes the focusability of the the <code>JMenuItem</code>.
	* <code>JMenuItem</code>'s are focusable, but subclasses may
	* want to be, this provides them the opportunity to override this
	* and invoke something else, or nothing at all. Refer to
	* {@link javax.swing.JMenu#initFocusability} for the motivation of
	* this.
	*/
	void initFocusability() {
	setFocusable(false);
	}

	/**
	* Initializes the menu item with the specified text and icon.
	*
	* @param text the text of the <code>JMenuItem</code>
	* @param icon the icon of the <code>JMenuItem</code>
	*/
	protected void init(String text, Icon icon) {
	if(text != null) {
	setText(text);
	}

	if(icon != null) {
	setIcon(icon);
	}

	// Listen for Focus events
	addFocusListener(new MenuItemFocusListener());
	setUIProperty("borderPainted", Boolean.FALSE);
	setFocusPainted(false);
	setHorizontalTextPosition(JButton.TRAILING);
	setHorizontalAlignment(JButton.LEADING);
	updateUI();
	}

	private static class MenuItemFocusListener implements FocusListener,
	Serializable {
	public void focusGained(FocusEvent event) {}
	public void focusLost(FocusEvent event) {
	// When focus is lost, repaint if
	// the focus information is painted
	JMenuItem mi = (JMenuItem)event.getSource();
	if(mi.isFocusPainted()) {
	mi.repaint();
	}
	}
	}


	/**
	* Sets the look and feel object that renders this component.
	*
	* @param ui the <code>JMenuItemUI</code> L&F object
	* @see UIDefaults#getUI
	* @beaninfo
	* bound: true
	* hidden: true
	* attribute: visualUpdate true
	* description: The UI object that implements the Component's LookAndFeel.
	*/
	public void setUI(MenuItemUI ui) {
	super.setUI(ui);
	}

	/**
	* Resets the UI property with a value from the current look and feel.
	*
	* @see JComponent#updateUI
	*/
	public void updateUI() {
	setUI((MenuItemUI)UIManager.getUI(this));
	}


	/**
	* Returns the suffix used to construct the name of the L&F class used to
	* render this component.
	*
	* @return the string "MenuItemUI"
	* @see JComponent#getUIClassID
	* @see UIDefaults#getUI
	*/
	public String getUIClassID() {
	return uiClassID;
	}


	/**
	* Identifies the menu item as "armed". If the mouse button is
	* released while it is over this item, the menu's action event
	* will fire. If the mouse button is released elsewhere, the
	* event will not fire and the menu item will be disarmed.
	*
	* @param b true to arm the menu item so it can be selected
	* @beaninfo
	* description: Mouse release will fire an action event
	* hidden: true
	*/
	public void setArmed(boolean b) {
	ButtonModel model = getModel();

	boolean oldValue = model.isArmed();
	if(model.isArmed() != b) {
	model.setArmed(b);
	}
	}

	/**
	* Returns whether the menu item is "armed".
	*
	* @return true if the menu item is armed, and it can be selected
	* @see #setArmed
	*/
	public boolean isArmed() {
	ButtonModel model = getModel();
	return model.isArmed();
	}

	/**
	* Enables or disables the menu item.
	*
	* @param b true to enable the item
	* @beaninfo
	* description: Does the component react to user interaction
	* bound: true
	* preferred: true
	*/
	public void setEnabled(boolean b) {
	// Make sure we aren't armed!
	if (!b && !UIManager.getBoolean("MenuItem.disabledAreNavigable")) {
	setArmed(false);
	}
	super.setEnabled(b);
	}


	/**
	* Returns true since <code>Menu</code>s, by definition,
	* should always be on top of all other windows. If the menu is
	* in an internal frame false is returned due to the rollover effect
	* for windows laf where the menu is not always on top.
	*/
	// package private
	boolean alwaysOnTop() {
	// Fix for bug #4482165
	if (SwingUtilities.getAncestorOfClass(JInternalFrame.class, this) !=
	null) {
	return false;
	}
	return true;
	}


	/* The keystroke which acts as the menu item's accelerator
	*/
	private KeyStroke accelerator;

	/**
	* Sets the key combination which invokes the menu item's
	* action listeners without navigating the menu hierarchy. It is the
	* UI's responsibility to install the correct action. Note that
	* when the keyboard accelerator is typed, it will work whether or
	* not the menu is currently displayed.
	*
	* @param keyStroke the <code>KeyStroke</code> which will
	* serve as an accelerator
	* @beaninfo
	* description: The keystroke combination which will invoke the
	* JMenuItem's actionlisteners without navigating the
	* menu hierarchy
	* bound: true
	* preferred: true
	*/
	public void setAccelerator(KeyStroke keyStroke) {
	KeyStroke oldAccelerator = accelerator;
	this.accelerator = keyStroke;
	repaint();
	revalidate();
	firePropertyChange("accelerator", oldAccelerator, accelerator);
	}

	/**
	* Returns the <code>KeyStroke</code> which serves as an accelerator
	* for the menu item.
	* @return a <code>KeyStroke</code> object identifying the
	* accelerator key
	*/
	public KeyStroke getAccelerator() {
	return this.accelerator;
	}

	/**
	* {@inheritDoc}
	*
	* @since 1.3
	*/
	protected void configurePropertiesFromAction(Action a) {
	super.configurePropertiesFromAction(a);
	configureAcceleratorFromAction(a);
	}

	void setIconFromAction(Action a) {
	Icon icon = null;
	if (a != null) {
	icon = (Icon)a.getValue(Action.SMALL_ICON);
	}
	setIcon(icon);
	}

	void largeIconChanged(Action a) {
	}

	void smallIconChanged(Action a) {
	setIconFromAction(a);
	}

	void configureAcceleratorFromAction(Action a) {
	KeyStroke ks = (a==null) ? null :
	(KeyStroke)a.getValue(Action.ACCELERATOR_KEY);
	setAccelerator(ks);
	}

	/**
	* {@inheritDoc}
	* @since 1.6
	*/
	protected void actionPropertyChanged(Action action, String propertyName) {
	if (propertyName == Action.ACCELERATOR_KEY) {
	configureAcceleratorFromAction(action);
	}
	else {
	super.actionPropertyChanged(action, propertyName);
	}
	}

	/**
	* Processes a mouse event forwarded from the
	* <code>MenuSelectionManager</code> and changes the menu
	* selection, if necessary, by using the
	* <code>MenuSelectionManager</code>'s API.
	* <p>
	* Note: you do not have to forward the event to sub-components.
	* This is done automatically by the <code>MenuSelectionManager</code>.
	*
	* @param e a <code>MouseEvent</code>
	* @param path the <code>MenuElement</code> path array
	* @param manager the <code>MenuSelectionManager</code>
	*/
	public void processMouseEvent(MouseEvent e,MenuElement path[],MenuSelectionManager manager) {
	processMenuDragMouseEvent(
	new MenuDragMouseEvent(e.getComponent(), e.getID(),
	e.getWhen(),
	e.getModifiers(), e.getX(), e.getY(),
	e.getXOnScreen(), e.getYOnScreen(),
	e.getClickCount(), e.isPopupTrigger(),
	path, manager));
	}


	/**
	* Processes a key event forwarded from the
	* <code>MenuSelectionManager</code> and changes the menu selection,
	* if necessary, by using <code>MenuSelectionManager</code>'s API.
	* <p>
	* Note: you do not have to forward the event to sub-components.
	* This is done automatically by the <code>MenuSelectionManager</code>.
	*
	* @param e a <code>KeyEvent</code>
	* @param path the <code>MenuElement</code> path array
	* @param manager the <code>MenuSelectionManager</code>
	*/
	public void processKeyEvent(KeyEvent e,MenuElement path[],MenuSelectionManager manager) {
	if (DEBUG) {
	System.out.println("in JMenuItem.processKeyEvent/3 for " + getText() +
	" " + KeyStroke.getKeyStrokeForEvent(e));
	}
	MenuKeyEvent mke = new MenuKeyEvent(e.getComponent(), e.getID(),
	e.getWhen(), e.getModifiers(),
	e.getKeyCode(), e.getKeyChar(),
	path, manager);
	processMenuKeyEvent(mke);

	if (mke.isConsumed()) {
	e.consume();
	}
	}



	/**
	* Handles mouse drag in a menu.
	*
	* @param e a <code>MenuDragMouseEvent</code> object
	*/
	public void processMenuDragMouseEvent(MenuDragMouseEvent e) {
	switch (e.getID()) {
	case MouseEvent.MOUSE_ENTERED:
	isMouseDragged = false; fireMenuDragMouseEntered(e); break;
	case MouseEvent.MOUSE_EXITED:
	isMouseDragged = false; fireMenuDragMouseExited(e); break;
	case MouseEvent.MOUSE_DRAGGED:
	isMouseDragged = true; fireMenuDragMouseDragged(e); break;
	case MouseEvent.MOUSE_RELEASED:
	if(isMouseDragged) fireMenuDragMouseReleased(e); break;
	default:
	break;
	}
	}

	/**
	* Handles a keystroke in a menu.
	*
	* @param e a <code>MenuKeyEvent</code> object
	*/
	public void processMenuKeyEvent(MenuKeyEvent e) {
	if (DEBUG) {
	System.out.println("in JMenuItem.processMenuKeyEvent for " + getText()+
	" " + KeyStroke.getKeyStrokeForEvent(e));
	}
	switch (e.getID()) {
	case KeyEvent.KEY_PRESSED:
	fireMenuKeyPressed(e); break;
	case KeyEvent.KEY_RELEASED:
	fireMenuKeyReleased(e); break;
	case KeyEvent.KEY_TYPED:
	fireMenuKeyTyped(e); break;
	default:
	break;
	}
	}

	/**
	* Notifies all listeners that have registered interest for
	* notification on this event type.
	*
	* @param event a <code>MenuMouseDragEvent</code>
	* @see EventListenerList
	*/
	protected void fireMenuDragMouseEntered(MenuDragMouseEvent event) {
	// Guaranteed to return a non-null array
	Object[] listeners = listenerList.getListenerList();
	// Process the listeners last to first, notifying
	// those that are interested in this event
	for (int i = listeners.length-2; i>=0; i-=2) {
	if (listeners[i]==MenuDragMouseListener.class) {
	// Lazily create the event:
	((MenuDragMouseListener)listeners[i+1]).menuDragMouseEntered(event);
	}
	}
	}

	/**
	* Notifies all listeners that have registered interest for
	* notification on this event type.
	*
	* @param event a <code>MenuDragMouseEvent</code>
	* @see EventListenerList
	*/
	protected void fireMenuDragMouseExited(MenuDragMouseEvent event) {
	// Guaranteed to return a non-null array
	Object[] listeners = listenerList.getListenerList();
	// Process the listeners last to first, notifying
	// those that are interested in this event
	for (int i = listeners.length-2; i>=0; i-=2) {
	if (listeners[i]==MenuDragMouseListener.class) {
	// Lazily create the event:
	((MenuDragMouseListener)listeners[i+1]).menuDragMouseExited(event);
	}
	}
	}

	/**
	* Notifies all listeners that have registered interest for
	* notification on this event type.
	*
	* @param event a <code>MenuDragMouseEvent</code>
	* @see EventListenerList
	*/
	protected void fireMenuDragMouseDragged(MenuDragMouseEvent event) {
	// Guaranteed to return a non-null array
	Object[] listeners = listenerList.getListenerList();
	// Process the listeners last to first, notifying
	// those that are interested in this event
	for (int i = listeners.length-2; i>=0; i-=2) {
	if (listeners[i]==MenuDragMouseListener.class) {
	// Lazily create the event:
	((MenuDragMouseListener)listeners[i+1]).menuDragMouseDragged(event);
	}
	}
	}

	/**
	* Notifies all listeners that have registered interest for
	* notification on this event type.
	*
	* @param event a <code>MenuDragMouseEvent</code>
	* @see EventListenerList
	*/
	protected void fireMenuDragMouseReleased(MenuDragMouseEvent event) {
	// Guaranteed to return a non-null array
	Object[] listeners = listenerList.getListenerList();
	// Process the listeners last to first, notifying
	// those that are interested in this event
	for (int i = listeners.length-2; i>=0; i-=2) {
	if (listeners[i]==MenuDragMouseListener.class) {
	// Lazily create the event:
	((MenuDragMouseListener)listeners[i+1]).menuDragMouseReleased(event);
	}
	}
	}

	/**
	* Notifies all listeners that have registered interest for
	* notification on this event type.
	*
	* @param event a <code>MenuKeyEvent</code>
	* @see EventListenerList
	*/
	protected void fireMenuKeyPressed(MenuKeyEvent event) {
	if (DEBUG) {
	System.out.println("in JMenuItem.fireMenuKeyPressed for " + getText()+
	" " + KeyStroke.getKeyStrokeForEvent(event));
	}
	// Guaranteed to return a non-null array
	Object[] listeners = listenerList.getListenerList();
	// Process the listeners last to first, notifying
	// those that are interested in this event
	for (int i = listeners.length-2; i>=0; i-=2) {
	if (listeners[i]==MenuKeyListener.class) {
	// Lazily create the event:
	((MenuKeyListener)listeners[i+1]).menuKeyPressed(event);
	}
	}
	}

	/**
	* Notifies all listeners that have registered interest for
	* notification on this event type.
	*
	* @param event a <code>MenuKeyEvent</code>
	* @see EventListenerList
	*/
	protected void fireMenuKeyReleased(MenuKeyEvent event) {
	if (DEBUG) {
	System.out.println("in JMenuItem.fireMenuKeyReleased for " + getText()+
	" " + KeyStroke.getKeyStrokeForEvent(event));
	}
	// Guaranteed to return a non-null array
	Object[] listeners = listenerList.getListenerList();
	// Process the listeners last to first, notifying
	// those that are interested in this event
	for (int i = listeners.length-2; i>=0; i-=2) {
	if (listeners[i]==MenuKeyListener.class) {
	// Lazily create the event:
	((MenuKeyListener)listeners[i+1]).menuKeyReleased(event);
	}
	}
	}

	/**
	* Notifies all listeners that have registered interest for
	* notification on this event type.
	*
	* @param event a <code>MenuKeyEvent</code>
	* @see EventListenerList
	*/
	protected void fireMenuKeyTyped(MenuKeyEvent event) {
	if (DEBUG) {
	System.out.println("in JMenuItem.fireMenuKeyTyped for " + getText()+
	" " + KeyStroke.getKeyStrokeForEvent(event));
	}
	// Guaranteed to return a non-null array
	Object[] listeners = listenerList.getListenerList();
	// Process the listeners last to first, notifying
	// those that are interested in this event
	for (int i = listeners.length-2; i>=0; i-=2) {
	if (listeners[i]==MenuKeyListener.class) {
	// Lazily create the event:
	((MenuKeyListener)listeners[i+1]).menuKeyTyped(event);
	}
	}
	}

	/**
	* Called by the <code>MenuSelectionManager</code> when the
	* <code>MenuElement</code> is selected or unselected.
	*
	* @param isIncluded true if this menu item is on the part of the menu
	* path that changed, false if this menu is part of the
	* a menu path that changed, but this particular part of
	* that path is still the same
	* @see MenuSelectionManager#setSelectedPath(MenuElement[])
	*/
	public void menuSelectionChanged(boolean isIncluded) {
	setArmed(isIncluded);
	}

	/**
	* This method returns an array containing the sub-menu
	* components for this menu component.
	*
	* @return an array of <code>MenuElement</code>s
	*/
	public MenuElement[] getSubElements() {
	return new MenuElement[0];
	}

	/**
	* Returns the <code>java.awt.Component</code> used to paint
	* this object. The returned component will be used to convert
	* events and detect if an event is inside a menu component.
	*
	* @return the <code>Component</code> that paints this menu item
	*/
	public Component getComponent() {
	return this;
	}

	/**
	* Adds a <code>MenuDragMouseListener</code> to the menu item.
	*
	* @param l the <code>MenuDragMouseListener</code> to be added
	*/
	public void addMenuDragMouseListener(MenuDragMouseListener l) {
	listenerList.add(MenuDragMouseListener.class, l);
	}

	/**
	* Removes a <code>MenuDragMouseListener</code> from the menu item.
	*
	* @param l the <code>MenuDragMouseListener</code> to be removed
	*/
	public void removeMenuDragMouseListener(MenuDragMouseListener l) {
	listenerList.remove(MenuDragMouseListener.class, l);
	}

	/**
	* Returns an array of all the <code>MenuDragMouseListener</code>s added
	* to this JMenuItem with addMenuDragMouseListener().
	*
	* @return all of the <code>MenuDragMouseListener</code>s added or an empty
	* array if no listeners have been added
	* @since 1.4
	*/
	public MenuDragMouseListener[] getMenuDragMouseListeners() {
	return listenerList.getListeners(MenuDragMouseListener.class);
	}

	/**
	* Adds a <code>MenuKeyListener</code> to the menu item.
	*
	* @param l the <code>MenuKeyListener</code> to be added
	*/
	public void addMenuKeyListener(MenuKeyListener l) {
	listenerList.add(MenuKeyListener.class, l);
	}

	/**
	* Removes a <code>MenuKeyListener</code> from the menu item.
	*
	* @param l the <code>MenuKeyListener</code> to be removed
	*/
	public void removeMenuKeyListener(MenuKeyListener l) {
	listenerList.remove(MenuKeyListener.class, l);
	}

	/**
	* Returns an array of all the <code>MenuKeyListener</code>s added
	* to this JMenuItem with addMenuKeyListener().
	*
	* @return all of the <code>MenuKeyListener</code>s added or an empty
	* array if no listeners have been added
	* @since 1.4
	*/
	public MenuKeyListener[] getMenuKeyListeners() {
	return listenerList.getListeners(MenuKeyListener.class);
	}

	/**
	* See JComponent.readObject() for information about serialization
	* in Swing.
	*/
	private void readObject(ObjectInputStream s)
	throws IOException, ClassNotFoundException
	{
	s.defaultReadObject();
	if (getUIClassID().equals(uiClassID)) {
	updateUI();
	}
	}

	private void writeObject(ObjectOutputStream s) throws IOException {
	s.defaultWriteObject();
	if (getUIClassID().equals(uiClassID)) {
	byte count = JComponent.getWriteObjCounter(this);
	JComponent.setWriteObjCounter(this, --count);
	if (count == 0 && ui != null) {
	ui.installUI(this);
	}
	}
	}


	/**
	* Returns a string representation of this <code>JMenuItem</code>.
	* This method is intended to be used only for debugging purposes,
	* and the content and format of the returned string may vary between
	* implementations. The returned string may be empty but may not
	* be <code>null</code>.
	*
	* @return a string representation of this <code>JMenuItem</code>
	*/
	protected String paramString() {
	return super.paramString();
	}

	/////////////////
	// Accessibility support
	////////////////

	/**
	* Returns the <code>AccessibleContext</code> associated with this
	* <code>JMenuItem</code>. For <code>JMenuItem</code>s,
	* the <code>AccessibleContext</code> takes the form of an
	* <code>AccessibleJMenuItem</code>.
	* A new AccessibleJMenuItme instance is created if necessary.
	*
	* @return an <code>AccessibleJMenuItem</code> that serves as the
	* <code>AccessibleContext</code> of this <code>JMenuItem</code>
	*/
	public AccessibleContext getAccessibleContext() {
	if (accessibleContext == null) {
	accessibleContext = new AccessibleJMenuItem();
	}
	return accessibleContext;
	}


	/**
	* This class implements accessibility support for the
	* <code>JMenuItem</code> class. It provides an implementation of the
	* Java Accessibility API appropriate to menu item user-interface
	* elements.
	* <p>
	* <strong>Warning:</strong>
	* 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 <code>java.beans</code> package.
	* Please see {@link java.beans.XMLEncoder}.
	*/
	@SuppressWarnings("serial")
	protected class AccessibleJMenuItem extends AccessibleAbstractButton implements ChangeListener {

	private boolean isArmed = false;
	private boolean hasFocus = false;
	private boolean isPressed = false;
	private boolean isSelected = false;

	AccessibleJMenuItem() {
	super();
	JMenuItem.this.addChangeListener(this);
	}

	/**
	* Get the role of this object.
	*
	* @return an instance of AccessibleRole describing the role of the
	* object
	*/
	public AccessibleRole getAccessibleRole() {
	return AccessibleRole.MENU_ITEM;
	}

	private void fireAccessibilityFocusedEvent(JMenuItem toCheck) {
	MenuElement [] path =
	MenuSelectionManager.defaultManager().getSelectedPath();
	if (path.length > 0) {
	Object menuItem = path[path.length - 1];
	if (toCheck == menuItem) {
	firePropertyChange(
	AccessibleContext.ACCESSIBLE_STATE_PROPERTY,
	null, AccessibleState.FOCUSED);
	}
	}
	}

	/**
	* Supports the change listener interface and fires property changes.
	*/
	public void stateChanged(ChangeEvent e) {
	firePropertyChange(AccessibleContext.ACCESSIBLE_VISIBLE_DATA_PROPERTY,
	Boolean.valueOf(false), Boolean.valueOf(true));
	if (JMenuItem.this.getModel().isArmed()) {
	if (!isArmed) {
	isArmed = true;
	firePropertyChange(
	AccessibleContext.ACCESSIBLE_STATE_PROPERTY,
	null, AccessibleState.ARMED);
	// Fix for 4848220 moved here to avoid major memory leak
	// Here we will fire the event in case of JMenuItem
	// See bug 4910323 for details [zav]
	fireAccessibilityFocusedEvent(JMenuItem.this);
	}
	} else {
	if (isArmed) {
	isArmed = false;
	firePropertyChange(
	AccessibleContext.ACCESSIBLE_STATE_PROPERTY,
	AccessibleState.ARMED, null);
	}
	}
	if (JMenuItem.this.isFocusOwner()) {
	if (!hasFocus) {
	hasFocus = true;
	firePropertyChange(
	AccessibleContext.ACCESSIBLE_STATE_PROPERTY,
	null, AccessibleState.FOCUSED);
	}
	} else {
	if (hasFocus) {
	hasFocus = false;
	firePropertyChange(
	AccessibleContext.ACCESSIBLE_STATE_PROPERTY,
	AccessibleState.FOCUSED, null);
	}
	}
	if (JMenuItem.this.getModel().isPressed()) {
	if (!isPressed) {
	isPressed = true;
	firePropertyChange(
	AccessibleContext.ACCESSIBLE_STATE_PROPERTY,
	null, AccessibleState.PRESSED);
	}
	} else {
	if (isPressed) {
	isPressed = false;
	firePropertyChange(
	AccessibleContext.ACCESSIBLE_STATE_PROPERTY,
	AccessibleState.PRESSED, null);
	}
	}
	if (JMenuItem.this.getModel().isSelected()) {
	if (!isSelected) {
	isSelected = true;
	firePropertyChange(
	AccessibleContext.ACCESSIBLE_STATE_PROPERTY,
	null, AccessibleState.CHECKED);

	// Fix for 4848220 moved here to avoid major memory leak
	// Here we will fire the event in case of JMenu
	// See bug 4910323 for details [zav]
	fireAccessibilityFocusedEvent(JMenuItem.this);
	}
	} else {
	if (isSelected) {
	isSelected = false;
	firePropertyChange(
	AccessibleContext.ACCESSIBLE_STATE_PROPERTY,
	AccessibleState.CHECKED, null);
	}
	}

	}
	} // inner class AccessibleJMenuItem


	}

Back to index...