https://openjdk.java.net/ 
/*
 * Copyright (c) 1997, 2015, 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.beans.JavaBean;
import java.beans.BeanProperty;

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

import java.io.ObjectOutputStream;
import java.io.IOException;
import java.util.Iterator;


An implementation of a two-state button.
The JRadioButton and JCheckBox classes
are subclasses of this class.
For information on using them see
How to Use Buttons, Check Boxes, and Radio Buttons,
a section in The Java Tutorial.


Buttons can be configured, and to some degree controlled, by
Actions.  Using an
Action with a button has many benefits beyond directly
configuring a button.  Refer to 
Swing Components Supporting Action for more
details, and you can find more information in How
to Use Actions, a section in The Java Tutorial.


Warning: Swing is not thread safe. For more
information see Swing's Threading
Policy.


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. 
Author:Jeff Dinkins
See Also:
Since:1.2
/**
 * An implementation of a two-state button.
 * The <code>JRadioButton</code> and <code>JCheckBox</code> classes
 * are subclasses of this class.
 * For information on using them see
 * <a
 href="http://docs.oracle.com/javase/tutorial/uiswing/components/button.html">How to Use Buttons, Check Boxes, and Radio Buttons</a>,
 * a section in <em>The Java Tutorial</em>.
 * <p>
 * Buttons 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 button has many benefits beyond directly
 * configuring a button.  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="http://docs.oracle.com/javase/tutorial/uiswing/misc/action.html">How
 * to Use Actions</a>, a section 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&trade;
 * has been added to the <code>java.beans</code> package.
 * Please see {@link java.beans.XMLEncoder}.
 *
 * @see JRadioButton
 * @see JCheckBox
 * @author Jeff Dinkins
 * @since 1.2
 */
@JavaBean(defaultProperty = "UIClassID", description = "An implementation of a two-state button.")
@SwingContainer(false)
@SuppressWarnings("serial") // Same-version serialization only
public class JToggleButton extends AbstractButton implements Accessible {

    
See Also:
/**
     * @see #getUIClassID
     * @see #readObject
     */
    private static final String uiClassID = "ToggleButtonUI";

    
Creates an initially unselected toggle button
without setting the text or image.

/**
     * Creates an initially unselected toggle button
     * without setting the text or image.
     */
    public JToggleButton () {
        this(null, null, false);
    }

    
Creates an initially unselected toggle button
with the specified image but no text.

Params:
  • icon –  the image that the button should display
/**
     * Creates an initially unselected toggle button
     * with the specified image but no text.
     *
     * @param icon  the image that the button should display
     */
    public JToggleButton(Icon icon) {
        this(null, icon, false);
    }

    
Creates a toggle button with the specified image
and selection state, but no text.

Params:
  • icon –  the image that the button should display
  • selected –  if true, the button is initially selected;
                 otherwise, the button is initially unselected
/**
     * Creates a toggle button with the specified image
     * and selection state, but no text.
     *
     * @param icon  the image that the button should display
     * @param selected  if true, the button is initially selected;
     *                  otherwise, the button is initially unselected
     */
    public JToggleButton(Icon icon, boolean selected) {
        this(null, icon, selected);
    }

    
Creates an unselected toggle button with the specified text.

Params:
  • text –  the string displayed on the toggle button
/**
     * Creates an unselected toggle button with the specified text.
     *
     * @param text  the string displayed on the toggle button
     */
    public JToggleButton (String text) {
        this(text, null, false);
    }

    
Creates a toggle button with the specified text
and selection state.

Params:
  • text –  the string displayed on the toggle button
  • selected –  if true, the button is initially selected;
                 otherwise, the button is initially unselected
/**
     * Creates a toggle button with the specified text
     * and selection state.
     *
     * @param text  the string displayed on the toggle button
     * @param selected  if true, the button is initially selected;
     *                  otherwise, the button is initially unselected
     */
    public JToggleButton (String text, boolean selected) {
        this(text, null, selected);
    }

    
Creates a toggle button where properties are taken from the
Action supplied.

Params:
  • a – an instance of an Action
Since:1.3
/**
     * Creates a toggle button where properties are taken from the
     * Action supplied.
     *
     * @param a an instance of an {@code Action}
     * @since 1.3
     */
    public JToggleButton(Action a) {
        this();
        setAction(a);
    }

    
Creates a toggle button that has the specified text and image,
and that is initially unselected.

Params:
  • text – the string displayed on the button
  • icon –  the image that the button should display
/**
     * Creates a toggle button that has the specified text and image,
     * and that is initially unselected.
     *
     * @param text the string displayed on the button
     * @param icon  the image that the button should display
     */
    public JToggleButton(String text, Icon icon) {
        this(text, icon, false);
    }

    
Creates a toggle button with the specified text, image, and
selection state.

Params:
  • text – the text of the toggle button
  • icon –  the image that the button should display
  • selected –  if true, the button is initially selected;
                 otherwise, the button is initially unselected
/**
     * Creates a toggle button with the specified text, image, and
     * selection state.
     *
     * @param text the text of the toggle button
     * @param icon  the image that the button should display
     * @param selected  if true, the button is initially selected;
     *                  otherwise, the button is initially unselected
     */
    public JToggleButton (String text, Icon icon, boolean selected) {
        // Create the model
        setModel(new ToggleButtonModel());

        model.setSelected(selected);

        // initialize
        init(text, icon);
    }

    
Resets the UI property to a value from the current look and feel.

See Also:
  • updateUI.updateUI
/**
     * Resets the UI property to a value from the current look and feel.
     *
     * @see JComponent#updateUI
     */
    public void updateUI() {
        setUI((ButtonUI)UIManager.getUI(this));
    }

    
Returns a string that specifies the name of the l&f class
that renders this component.

See Also:
Returns:String "ToggleButtonUI"
/**
     * Returns a string that specifies the name of the l&amp;f class
     * that renders this component.
     *
     * @return String "ToggleButtonUI"
     * @see JComponent#getUIClassID
     * @see UIDefaults#getUI
     */
    @BeanProperty(bound = false, description
            = "A string that specifies the name of the L&amp;F class")
    public String getUIClassID() {
        return uiClassID;
    }


    
Overriden to return true, JToggleButton supports
the selected state.

/**
     * Overriden to return true, JToggleButton supports
     * the selected state.
     */
    boolean shouldUpdateSelectedStateFromAction() {
        return true;
    }

    private JToggleButton getGroupSelection(FocusEvent.Cause cause) {
        switch (cause) {
          case ACTIVATION:
          case TRAVERSAL:
          case TRAVERSAL_UP:
          case TRAVERSAL_DOWN:
          case TRAVERSAL_FORWARD:
          case TRAVERSAL_BACKWARD:
            ButtonModel model = getModel();
            JToggleButton selection = this;
            if (model != null) {
                ButtonGroup group = model.getGroup();
                if (group != null && group.getSelection() != null
                                                  && !group.isSelected(model)) {
                    Iterator<AbstractButton> iterator =
                                               group.getElements().asIterator();
                    while (iterator.hasNext()) {
                        AbstractButton member = iterator.next();
                        if (group.isSelected(member.getModel())) {
                            if (member instanceof JToggleButton &&
                                member.isVisible() && member.isDisplayable() &&
                                member.isEnabled() && member.isFocusable()) {
                                selection = (JToggleButton) member;
                            }
                            break;
                        }
                    }
                }
            }
            return selection;
          default:
            return this;
        }
    }

    
If this toggle button is a member of the ButtonGroup which has another toggle button which is selected and can be the focus owner, and the focus cause argument denotes window activation or focus traversal action of any direction the result of the method execution is the same as calling Component.requestFocus(Cause) on the toggle button selected in the group. In all other cases the result of the method is the same as calling Component.requestFocus(Cause) on this toggle button. 
Params:
  • cause – the cause why the focus is requested
See Also:
Since:9
/**
     * If this toggle button is a member of the {@link ButtonGroup} which has
     * another toggle button which is selected and can be the focus owner,
     * and the focus cause argument denotes window activation or focus
     * traversal action of any direction the result of the method execution
     * is the same as calling
     * {@link Component#requestFocus(FocusEvent.Cause)} on the toggle button
     * selected in the group.
     * In all other cases the result of the method is the same as calling
     * {@link Component#requestFocus(FocusEvent.Cause)} on this toggle button.
     *
     * @param  cause the cause why the focus is requested
     * @see ButtonGroup
     * @see Component#requestFocus(FocusEvent.Cause)
     * @see FocusEvent.Cause
     *
     * @since 9
     */
    @Override
    public void requestFocus(FocusEvent.Cause cause) {
        getGroupSelection(cause).requestFocusUnconditionally(cause);
    }

    private void requestFocusUnconditionally(FocusEvent.Cause cause) {
        super.requestFocus(cause);
    }

    
If this toggle button is a member of the ButtonGroup which has another toggle button which is selected and can be the focus owner, and the focus cause argument denotes window activation or focus traversal action of any direction the result of the method execution is the same as calling Component.requestFocusInWindow(Cause) on the toggle button selected in the group. In all other cases the result of the method is the same as calling Component.requestFocusInWindow(Cause) on this toggle button. 
Params:
  • cause – the cause why the focus is requested
See Also:
Since:9
/**
     * If this toggle button is a member of the {@link ButtonGroup} which has
     * another toggle button which is selected and can be the focus owner,
     * and the focus cause argument denotes window activation or focus
     * traversal action of any direction the result of the method execution
     * is the same as calling
     * {@link Component#requestFocusInWindow(FocusEvent.Cause)} on the toggle
     * button selected in the group.
     * In all other cases the result of the method is the same as calling
     * {@link Component#requestFocusInWindow(FocusEvent.Cause)} on this toggle
     * button.
     *
     * @param  cause the cause why the focus is requested
     * @see ButtonGroup
     * @see Component#requestFocusInWindow(FocusEvent.Cause)
     * @see FocusEvent.Cause
     *
     * @since 9
     */
    public boolean requestFocusInWindow(FocusEvent.Cause cause) {
        return getGroupSelection(cause)
                                    .requestFocusInWindowUnconditionally(cause);
    }

    private boolean requestFocusInWindowUnconditionally(FocusEvent.Cause cause) {
        return super.requestFocusInWindow(cause);
    }

    // *********************************************************************

    
The ToggleButton model


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. 
/**
     * The ToggleButton 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&trade;
     * has been added to the <code>java.beans</code> package.
     * Please see {@link java.beans.XMLEncoder}.
     */
    @SuppressWarnings("serial") // Same-version serialization only
    public static class ToggleButtonModel extends DefaultButtonModel {

        
Creates a new ToggleButton Model

/**
         * Creates a new ToggleButton Model
         */
        public ToggleButtonModel () {
        }

        
Checks if the button is selected.

/**
         * Checks if the button is selected.
         */
        public boolean isSelected() {
//              if(getGroup() != null) {
//                  return getGroup().isSelected(this);
//              } else {
                return (stateMask & SELECTED) != 0;
//              }
        }


        
Sets the selected state of the button.

Params:
  • b – true selects the toggle button,
         false deselects the toggle button.
/**
         * Sets the selected state of the button.
         * @param b true selects the toggle button,
         *          false deselects the toggle button.
         */
        public void setSelected(boolean b) {
            ButtonGroup group = getGroup();
            if (group != null) {
                // use the group model instead
                group.setSelected(this, b);
                b = group.isSelected(this);
            }

            if (isSelected() == b) {
                return;
            }

            if (b) {
                stateMask |= SELECTED;
            } else {
                stateMask &= ~SELECTED;
            }

            // Send ChangeEvent
            fireStateChanged();

            // Send ItemEvent
            fireItemStateChanged(
                    new ItemEvent(this,
                                  ItemEvent.ITEM_STATE_CHANGED,
                                  this,
                                  this.isSelected() ?  ItemEvent.SELECTED : ItemEvent.DESELECTED));

        }

        
Sets the pressed state of the toggle button.

/**
         * Sets the pressed state of the toggle button.
         */
        @SuppressWarnings("deprecation")
        public void setPressed(boolean b) {
            if ((isPressed() == b) || !isEnabled()) {
                return;
            }

            if (b == false && isArmed()) {
                setSelected(!this.isSelected());
            }

            if (b) {
                stateMask |= PRESSED;
            } else {
                stateMask &= ~PRESSED;
            }

            fireStateChanged();

            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));
            }

        }
    }


    
See readObject() and writeObject() in JComponent for more
information about serialization in Swing.

/**
     * See readObject() and writeObject() in JComponent for more
     * information about serialization in Swing.
     */
    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 JToggleButton. 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 null.

Returns: a string representation of this JToggleButton.
/**
     * Returns a string representation of this JToggleButton. 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 JToggleButton.
     */
    protected String paramString() {
        return super.paramString();
    }


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

    
Gets the AccessibleContext associated with this JToggleButton.
For toggle buttons, the AccessibleContext takes the form of an
AccessibleJToggleButton.
A new AccessibleJToggleButton instance is created if necessary.

Returns:an AccessibleJToggleButton that serves as the
        AccessibleContext of this JToggleButton
/**
     * Gets the AccessibleContext associated with this JToggleButton.
     * For toggle buttons, the AccessibleContext takes the form of an
     * AccessibleJToggleButton.
     * A new AccessibleJToggleButton instance is created if necessary.
     *
     * @return an AccessibleJToggleButton that serves as the
     *         AccessibleContext of this JToggleButton
     */
    @BeanProperty(bound = false, expert = true, description
            = "The AccessibleContext associated with this ToggleButton.")
    public AccessibleContext getAccessibleContext() {
        if (accessibleContext == null) {
            accessibleContext = new AccessibleJToggleButton();
        }
        return accessibleContext;
    }

    
This class implements accessibility support for the
JToggleButton class.  It provides an implementation of the
Java Accessibility API appropriate to toggle button user-interface
elements.


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. 
/**
     * This class implements accessibility support for the
     * <code>JToggleButton</code> class.  It provides an implementation of the
     * Java Accessibility API appropriate to toggle button 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&trade;
     * has been added to the <code>java.beans</code> package.
     * Please see {@link java.beans.XMLEncoder}.
     */
    @SuppressWarnings("serial") // Same-version serialization only
    protected class AccessibleJToggleButton extends AccessibleAbstractButton
            implements ItemListener {

        
Constructs AccessibleJToggleButton 
/**
         * Constructs {@code AccessibleJToggleButton}
         */
        public AccessibleJToggleButton() {
            super();
            JToggleButton.this.addItemListener(this);
        }

        
Fire accessible property change events when the state of the
toggle button changes.

/**
         * Fire accessible property change events when the state of the
         * toggle button changes.
         */
        public void itemStateChanged(ItemEvent e) {
            JToggleButton tb = (JToggleButton) e.getSource();
            if (JToggleButton.this.accessibleContext != null) {
                if (tb.isSelected()) {
                    JToggleButton.this.accessibleContext.firePropertyChange(
                            AccessibleContext.ACCESSIBLE_STATE_PROPERTY,
                            null, AccessibleState.CHECKED);
                } else {
                    JToggleButton.this.accessibleContext.firePropertyChange(
                            AccessibleContext.ACCESSIBLE_STATE_PROPERTY,
                            AccessibleState.CHECKED, null);
                }
            }
        }

        
Get the role of this object.

Returns:an instance of AccessibleRole describing the role of the
object
/**
         * Get the role of this object.
         *
         * @return an instance of AccessibleRole describing the role of the
         * object
         */
        public AccessibleRole getAccessibleRole() {
            return AccessibleRole.TOGGLE_BUTTON;
        }
    } // inner class AccessibleJToggleButton
}