/* * Copyright (c) 1997, 2008, 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.awt.*;import java.awt.event.*;import java.awt.image.*;import java.io.Serializable;import java.util.EventListener;import javax.swing.event.*; /** * The default implementation of a <code>Button</code> component's data model. * <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<sup><font size="-2">TM</font></sup> * has been added to the <code>java.beans</code> package. * Please see {@link java.beans.XMLEncoder}. * * @author Jeff Dinkins */public class DefaultButtonModel implements ButtonModel, Serializable {     /** The bitmask used to store the state of the button. */    protected int stateMask = 0;     /** The action command string fired by the button. */    protected String actionCommand = null;     /** The button group that the button belongs to. */    protected ButtonGroup group = null;     /** The button's mnemonic. */    protected int mnemonic = 0;     /**     * Only one <code>ChangeEvent</code> is needed per button model     * instance since the event's only state is the source property.     * The source of events generated is always "this".     */    protected transient ChangeEvent changeEvent = null;     /** Stores the listeners on this model. */    protected EventListenerList listenerList = new EventListenerList();     // controls the usage of the MenuItem.disabledAreNavigable UIDefaults    // property in the setArmed() method    private boolean menuItem = false;     /**     * Constructs a <code>DefaultButtonModel</code>.     *     */    public DefaultButtonModel() {        stateMask = 0;        setEnabled(true);    }     /**     * Identifies the "armed" bit in the bitmask, which     * indicates partial commitment towards choosing/triggering     * the button.     */    public final static int ARMED = 1 << 0;     /**     * Identifies the "selected" bit in the bitmask, which     * indicates that the button has been selected. Only needed for     * certain types of buttons - such as radio button or check box.     */    public final static int SELECTED = 1 << 1;     /**     * Identifies the "pressed" bit in the bitmask, which     * indicates that the button is pressed.     */    public final static int PRESSED = 1 << 2;     /**     * Identifies the "enabled" bit in the bitmask, which     * indicates that the button can be selected by     * an input device (such as a mouse pointer).     */    public final static int ENABLED = 1 << 3;     /**     * Identifies the "rollover" bit in the bitmask, which     * indicates that the mouse is over the button.     */    public final static int ROLLOVER = 1 << 4;     /**     * {@inheritDoc}     */    public void setActionCommand(String actionCommand) {        this.actionCommand = actionCommand;    }     /**     * {@inheritDoc}     */    public String getActionCommand() {        return actionCommand;    }     /**     * {@inheritDoc}     */    public boolean isArmed() {        return (stateMask & ARMED) != 0;    }     /**     * {@inheritDoc}     */    public boolean isSelected() {        return (stateMask & SELECTED) != 0;    }     /**     * {@inheritDoc}     */    public boolean isEnabled() {        return (stateMask & ENABLED) != 0;    }     /**     * {@inheritDoc}     */    public boolean isPressed() {        return (stateMask & PRESSED) != 0;    }     /**     * {@inheritDoc}     */    public boolean isRollover() {        return (stateMask & ROLLOVER) != 0;    }     /**     * {@inheritDoc}     */    public void setArmed(boolean b) {        if(isMenuItem() &&                UIManager.getBoolean("MenuItem.disabledAreNavigable")) {            if ((isArmed() == b)) {                return;            }        } else {            if ((isArmed() == b) || !isEnabled()) {                return;            }        }         if (b) {            stateMask |= ARMED;        } else {            stateMask &= ~ARMED;        }         fireStateChanged();    }     /**     * {@inheritDoc}     */    public void setEnabled(boolean b) {        if(isEnabled() == b) {            return;        }         if (b) {            stateMask |= ENABLED;        } else {            stateMask &= ~ENABLED;            // unarm and unpress, just in case            stateMask &= ~ARMED;            stateMask &= ~PRESSED;        }          fireStateChanged();    }     /**     * {@inheritDoc}     */    public void setSelected(boolean b) {        if (this.isSelected() == b) {            return;        }         if (b) {            stateMask |= SELECTED;        } else {            stateMask &= ~SELECTED;        }         fireItemStateChanged(                new ItemEvent(this,                              ItemEvent.ITEM_STATE_CHANGED,                              this,                              b ?  ItemEvent.SELECTED : ItemEvent.DESELECTED));         fireStateChanged();     }      /**     * {@inheritDoc}     */    public void setPressed(boolean b) {        if((isPressed() == b) || !isEnabled()) {            return;        }         if (b) {            stateMask |= PRESSED;        } else {            stateMask &= ~PRESSED;        }         if(!isPressed() && isArmed()) {            int modifiers = 0;            AWTEvent currentEvent = EventQueue.getCurrentEvent();            if (currentEvent instanceof InputEvent) {                modifiers = ((InputEvent)currentEvent).getModifiers();            } else if (currentEvent instanceof ActionEvent) {                modifiers = ((ActionEvent)currentEvent).getModifiers();            }            fireActionPerformed(                new ActionEvent(this, ActionEvent.ACTION_PERFORMED,                                getActionCommand(),                                EventQueue.getMostRecentEventTime(),                                modifiers));        }         fireStateChanged();    }     /**     * {@inheritDoc}     */    public void setRollover(boolean b) {        if((isRollover() == b) || !isEnabled()) {            return;        }         if (b) {            stateMask |= ROLLOVER;        } else {            stateMask &= ~ROLLOVER;        }         fireStateChanged();    }     /**     * {@inheritDoc}     */    public void setMnemonic(int key) {        mnemonic = key;        fireStateChanged();    }     /**     * {@inheritDoc}     */    public int getMnemonic() {        return mnemonic;    }     /**     * {@inheritDoc}     */    public void addChangeListener(ChangeListener l) {        listenerList.add(ChangeListener.class, l);    }     /**     * {@inheritDoc}     */    public void removeChangeListener(ChangeListener l) {        listenerList.remove(ChangeListener.class, l);    }     /**     * Returns an array of all the change listeners     * registered on this <code>DefaultButtonModel</code>.     *     * @return all of this model's <code>ChangeListener</code>s     *         or an empty     *         array if no change listeners are currently registered     *     * @see #addChangeListener     * @see #removeChangeListener     *     * @since 1.4     */    public ChangeListener[] getChangeListeners() {        return listenerList.getListeners(ChangeListener.class);    }     /**     * Notifies all listeners that have registered interest for     * notification on this event type.  The event instance     * is created lazily.     *     * @see EventListenerList     */    protected void fireStateChanged() {        // 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]==ChangeListener.class) {                // Lazily create the event:                if (changeEvent == null)                    changeEvent = new ChangeEvent(this);                ((ChangeListener)listeners[i+1]).stateChanged(changeEvent);            }        }    }     /**     * {@inheritDoc}     */    public void addActionListener(ActionListener l) {        listenerList.add(ActionListener.class, l);    }     /**     * {@inheritDoc}     */    public void removeActionListener(ActionListener l) {        listenerList.remove(ActionListener.class, l);    }     /**     * Returns an array of all the action listeners     * registered on this <code>DefaultButtonModel</code>.     *     * @return all of this model's <code>ActionListener</code>s     *         or an empty     *         array if no action listeners are currently registered     *     * @see #addActionListener     * @see #removeActionListener     *     * @since 1.4     */    public ActionListener[] getActionListeners() {        return listenerList.getListeners(ActionListener.class);    }     /**     * Notifies all listeners that have registered interest for     * notification on this event type.     *     * @param e the <code>ActionEvent</code> to deliver to listeners     * @see EventListenerList     */    protected void fireActionPerformed(ActionEvent e) {        // 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]==ActionListener.class) {                // Lazily create the event:                // if (changeEvent == null)                // changeEvent = new ChangeEvent(this);                ((ActionListener)listeners[i+1]).actionPerformed(e);            }        }    }     /**     * {@inheritDoc}     */    public void addItemListener(ItemListener l) {        listenerList.add(ItemListener.class, l);    }     /**     * {@inheritDoc}     */    public void removeItemListener(ItemListener l) {        listenerList.remove(ItemListener.class, l);    }     /**     * Returns an array of all the item listeners     * registered on this <code>DefaultButtonModel</code>.     *     * @return all of this model's <code>ItemListener</code>s     *         or an empty     *         array if no item listeners are currently registered     *     * @see #addItemListener     * @see #removeItemListener     *     * @since 1.4     */    public ItemListener[] getItemListeners() {        return listenerList.getListeners(ItemListener.class);    }     /**     * Notifies all listeners that have registered interest for     * notification on this event type.     *     * @param e the <code>ItemEvent</code> to deliver to listeners     * @see EventListenerList     */    protected void fireItemStateChanged(ItemEvent e) {        // 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]==ItemListener.class) {                // Lazily create the event:                // if (changeEvent == null)                // changeEvent = new ChangeEvent(this);                ((ItemListener)listeners[i+1]).itemStateChanged(e);            }        }    }     /**     * Returns an array of all the objects currently registered as     * <code><em>Foo</em>Listener</code>s     * upon this model.     * <code><em>Foo</em>Listener</code>s     * are registered using the <code>add<em>Foo</em>Listener</code> method.     * <p>     * You can specify the <code>listenerType</code> argument     * with a class literal, such as <code><em>Foo</em>Listener.class</code>.     * For example, you can query a <code>DefaultButtonModel</code>     * instance <code>m</code>     * for its action listeners     * with the following code:     *     * <pre>ActionListener[] als = (ActionListener[])(m.getListeners(ActionListener.class));</pre>     *     * If no such listeners exist,     * this method returns an empty array.     *     * @param listenerType  the type of listeners requested;     *          this parameter should specify an interface     *          that descends from <code>java.util.EventListener</code>     * @return an array of all objects registered as     *          <code><em>Foo</em>Listener</code>s     *          on this model,     *          or an empty array if no such     *          listeners have been added     * @exception ClassCastException if <code>listenerType</code> doesn't     *          specify a class or interface that implements     *          <code>java.util.EventListener</code>     *     * @see #getActionListeners     * @see #getChangeListeners     * @see #getItemListeners     *     * @since 1.3     */    public <T extends EventListener> T[] getListeners(Class<T> listenerType) {        return listenerList.getListeners(listenerType);    } 

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