| /* |
| * Copyright (c) 1995, 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 java.awt; |
| |
| import java.awt.peer.CheckboxPeer; |
| import java.awt.event.*; |
| import java.util.EventListener; |
| import java.io.ObjectOutputStream; |
| import java.io.ObjectInputStream; |
| import java.io.IOException; |
| import javax.accessibility.*; |
| |
| |
| /** |
| * A check box is a graphical component that can be in either an |
| * "on" (<code>true</code>) or "off" (<code>false</code>) state. |
| * Clicking on a check box changes its state from |
| * "on" to "off," or from "off" to "on." |
| * <p> |
| * The following code example creates a set of check boxes in |
| * a grid layout: |
| * <p> |
| * <hr><blockquote><pre> |
| * setLayout(new GridLayout(3, 1)); |
| * add(new Checkbox("one", null, true)); |
| * add(new Checkbox("two")); |
| * add(new Checkbox("three")); |
| * </pre></blockquote><hr> |
| * <p> |
| * This image depicts the check boxes and grid layout |
| * created by this code example: |
| * <p> |
| * <img src="doc-files/Checkbox-1.gif" alt="The following context describes the graphic." |
| * ALIGN=center HSPACE=10 VSPACE=7> |
| * <p> |
| * The button labeled <code>one</code> is in the "on" state, and the |
| * other two are in the "off" state. In this example, which uses the |
| * <code>GridLayout</code> class, the states of the three check |
| * boxes are set independently. |
| * <p> |
| * Alternatively, several check boxes can be grouped together under |
| * the control of a single object, using the |
| * <code>CheckboxGroup</code> class. |
| * In a check box group, at most one button can be in the "on" |
| * state at any given time. Clicking on a check box to turn it on |
| * forces any other check box in the same group that is on |
| * into the "off" state. |
| * |
| * @author Sami Shaio |
| * @see java.awt.GridLayout |
| * @see java.awt.CheckboxGroup |
| * @since JDK1.0 |
| */ |
| public class Checkbox extends Component implements ItemSelectable, Accessible { |
| |
| static { |
| /* ensure that the necessary native libraries are loaded */ |
| Toolkit.loadLibraries(); |
| if (!GraphicsEnvironment.isHeadless()) { |
| initIDs(); |
| } |
| } |
| |
| /** |
| * The label of the Checkbox. |
| * This field can be null. |
| * @serial |
| * @see #getLabel() |
| * @see #setLabel(String) |
| */ |
| String label; |
| |
| /** |
| * The state of the <code>Checkbox</code>. |
| * @serial |
| * @see #getState() |
| * @see #setState(boolean) |
| */ |
| boolean state; |
| |
| /** |
| * The check box group. |
| * This field can be null indicating that the checkbox |
| * is not a group checkbox. |
| * @serial |
| * @see #getCheckboxGroup() |
| * @see #setCheckboxGroup(CheckboxGroup) |
| */ |
| CheckboxGroup group; |
| |
| transient ItemListener itemListener; |
| |
| private static final String base = "checkbox"; |
| private static int nameCounter = 0; |
| |
| /* |
| * JDK 1.1 serialVersionUID |
| */ |
| private static final long serialVersionUID = 7270714317450821763L; |
| |
| /** |
| * Helper function for setState and CheckboxGroup.setSelectedCheckbox |
| * Should remain package-private. |
| */ |
| void setStateInternal(boolean state) { |
| this.state = state; |
| CheckboxPeer peer = (CheckboxPeer)this.peer; |
| if (peer != null) { |
| peer.setState(state); |
| } |
| } |
| |
| /** |
| * Creates a check box with an empty string for its label. |
| * The state of this check box is set to "off," and it is not |
| * part of any check box group. |
| * @exception HeadlessException if GraphicsEnvironment.isHeadless() |
| * returns true |
| * @see java.awt.GraphicsEnvironment#isHeadless |
| */ |
| public Checkbox() throws HeadlessException { |
| this("", false, null); |
| } |
| |
| /** |
| * Creates a check box with the specified label. The state |
| * of this check box is set to "off," and it is not part of |
| * any check box group. |
| * |
| * @param label a string label for this check box, |
| * or <code>null</code> for no label. |
| * @exception HeadlessException if |
| * <code>GraphicsEnvironment.isHeadless</code> |
| * returns <code>true</code> |
| * @see java.awt.GraphicsEnvironment#isHeadless |
| */ |
| public Checkbox(String label) throws HeadlessException { |
| this(label, false, null); |
| } |
| |
| /** |
| * Creates a check box with the specified label |
| * and sets the specified state. |
| * This check box is not part of any check box group. |
| * |
| * @param label a string label for this check box, |
| * or <code>null</code> for no label |
| * @param state the initial state of this check box |
| * @exception HeadlessException if |
| * <code>GraphicsEnvironment.isHeadless</code> |
| * returns <code>true</code> |
| * @see java.awt.GraphicsEnvironment#isHeadless |
| */ |
| public Checkbox(String label, boolean state) throws HeadlessException { |
| this(label, state, null); |
| } |
| |
| /** |
| * Constructs a Checkbox with the specified label, set to the |
| * specified state, and in the specified check box group. |
| * |
| * @param label a string label for this check box, |
| * or <code>null</code> for no label. |
| * @param state the initial state of this check box. |
| * @param group a check box group for this check box, |
| * or <code>null</code> for no group. |
| * @exception HeadlessException if |
| * <code>GraphicsEnvironment.isHeadless</code> |
| * returns <code>true</code> |
| * @see java.awt.GraphicsEnvironment#isHeadless |
| * @since JDK1.1 |
| */ |
| public Checkbox(String label, boolean state, CheckboxGroup group) |
| throws HeadlessException { |
| GraphicsEnvironment.checkHeadless(); |
| this.label = label; |
| this.state = state; |
| this.group = group; |
| if (state && (group != null)) { |
| group.setSelectedCheckbox(this); |
| } |
| } |
| |
| /** |
| * Creates a check box with the specified label, in the specified |
| * check box group, and set to the specified state. |
| * |
| * @param label a string label for this check box, |
| * or <code>null</code> for no label. |
| * @param group a check box group for this check box, |
| * or <code>null</code> for no group. |
| * @param state the initial state of this check box. |
| * @exception HeadlessException if |
| * <code>GraphicsEnvironment.isHeadless</code> |
| * returns <code>true</code> |
| * @see java.awt.GraphicsEnvironment#isHeadless |
| * @since JDK1.1 |
| */ |
| public Checkbox(String label, CheckboxGroup group, boolean state) |
| throws HeadlessException { |
| this(label, state, group); |
| } |
| |
| /** |
| * Constructs a name for this component. Called by |
| * <code>getName</code> when the name is <code>null</code>. |
| * |
| * @return a name for this component |
| */ |
| String constructComponentName() { |
| synchronized (Checkbox.class) { |
| return base + nameCounter++; |
| } |
| } |
| |
| /** |
| * Creates the peer of the Checkbox. The peer allows you to change the |
| * look of the Checkbox without changing its functionality. |
| * |
| * @see java.awt.Toolkit#createCheckbox(java.awt.Checkbox) |
| * @see java.awt.Component#getToolkit() |
| */ |
| public void addNotify() { |
| synchronized (getTreeLock()) { |
| if (peer == null) |
| peer = getToolkit().createCheckbox(this); |
| super.addNotify(); |
| } |
| } |
| |
| /** |
| * Gets the label of this check box. |
| * |
| * @return the label of this check box, or <code>null</code> |
| * if this check box has no label. |
| * @see #setLabel(String) |
| */ |
| public String getLabel() { |
| return label; |
| } |
| |
| /** |
| * Sets this check box's label to be the string argument. |
| * |
| * @param label a string to set as the new label, or |
| * <code>null</code> for no label. |
| * @see #getLabel |
| */ |
| public void setLabel(String label) { |
| boolean testvalid = false; |
| |
| synchronized (this) { |
| if (label != this.label && (this.label == null || |
| !this.label.equals(label))) { |
| this.label = label; |
| CheckboxPeer peer = (CheckboxPeer)this.peer; |
| if (peer != null) { |
| peer.setLabel(label); |
| } |
| testvalid = true; |
| } |
| } |
| |
| // This could change the preferred size of the Component. |
| if (testvalid) { |
| invalidateIfValid(); |
| } |
| } |
| |
| /** |
| * Determines whether this check box is in the "on" or "off" state. |
| * The boolean value <code>true</code> indicates the "on" state, |
| * and <code>false</code> indicates the "off" state. |
| * |
| * @return the state of this check box, as a boolean value |
| * @see #setState |
| */ |
| public boolean getState() { |
| return state; |
| } |
| |
| /** |
| * Sets the state of this check box to the specified state. |
| * The boolean value <code>true</code> indicates the "on" state, |
| * and <code>false</code> indicates the "off" state. |
| * |
| * <p>Note that this method should be primarily used to |
| * initialize the state of the checkbox. Programmatically |
| * setting the state of the checkbox will <i>not</i> trigger |
| * an <code>ItemEvent</code>. The only way to trigger an |
| * <code>ItemEvent</code> is by user interaction. |
| * |
| * @param state the boolean state of the check box |
| * @see #getState |
| */ |
| public void setState(boolean state) { |
| /* Cannot hold check box lock when calling group.setSelectedCheckbox. */ |
| CheckboxGroup group = this.group; |
| if (group != null) { |
| if (state) { |
| group.setSelectedCheckbox(this); |
| } else if (group.getSelectedCheckbox() == this) { |
| state = true; |
| } |
| } |
| setStateInternal(state); |
| } |
| |
| /** |
| * Returns an array (length 1) containing the checkbox |
| * label or null if the checkbox is not selected. |
| * @see ItemSelectable |
| */ |
| public Object[] getSelectedObjects() { |
| if (state) { |
| Object[] items = new Object[1]; |
| items[0] = label; |
| return items; |
| } |
| return null; |
| } |
| |
| /** |
| * Determines this check box's group. |
| * @return this check box's group, or <code>null</code> |
| * if the check box is not part of a check box group. |
| * @see #setCheckboxGroup(CheckboxGroup) |
| */ |
| public CheckboxGroup getCheckboxGroup() { |
| return group; |
| } |
| |
| /** |
| * Sets this check box's group to the specified check box group. |
| * If this check box is already in a different check box group, |
| * it is first taken out of that group. |
| * <p> |
| * If the state of this check box is <code>true</code> and the new |
| * group already has a check box selected, this check box's state |
| * is changed to <code>false</code>. If the state of this check |
| * box is <code>true</code> and the new group has no check box |
| * selected, this check box becomes the selected checkbox for |
| * the new group and its state is <code>true</code>. |
| * |
| * @param g the new check box group, or <code>null</code> |
| * to remove this check box from any check box group |
| * @see #getCheckboxGroup |
| */ |
| public void setCheckboxGroup(CheckboxGroup g) { |
| CheckboxGroup oldGroup; |
| boolean oldState; |
| |
| /* Do nothing if this check box has already belonged |
| * to the check box group g. |
| */ |
| if (this.group == g) { |
| return; |
| } |
| |
| synchronized (this) { |
| oldGroup = this.group; |
| oldState = getState(); |
| |
| this.group = g; |
| CheckboxPeer peer = (CheckboxPeer)this.peer; |
| if (peer != null) { |
| peer.setCheckboxGroup(g); |
| } |
| if (this.group != null && getState()) { |
| if (this.group.getSelectedCheckbox() != null) { |
| setState(false); |
| } else { |
| this.group.setSelectedCheckbox(this); |
| } |
| } |
| } |
| |
| /* Locking check box below could cause deadlock with |
| * CheckboxGroup's setSelectedCheckbox method. |
| * |
| * Fix for 4726853 by kdm@sparc.spb.su |
| * Here we should check if this check box was selected |
| * in the previous group and set selected check box to |
| * null for that group if so. |
| */ |
| if (oldGroup != null && oldState) { |
| oldGroup.setSelectedCheckbox(null); |
| } |
| } |
| |
| /** |
| * Adds the specified item listener to receive item events from |
| * this check box. Item events are sent to listeners in response |
| * to user input, but not in response to calls to setState(). |
| * If l is null, no exception is thrown and no action is performed. |
| * <p>Refer to <a href="doc-files/AWTThreadIssues.html#ListenersThreads" |
| * >AWT Threading Issues</a> for details on AWT's threading model. |
| * |
| * @param l the item listener |
| * @see #removeItemListener |
| * @see #getItemListeners |
| * @see #setState |
| * @see java.awt.event.ItemEvent |
| * @see java.awt.event.ItemListener |
| * @since JDK1.1 |
| */ |
| public synchronized void addItemListener(ItemListener l) { |
| if (l == null) { |
| return; |
| } |
| itemListener = AWTEventMulticaster.add(itemListener, l); |
| newEventsOnly = true; |
| } |
| |
| /** |
| * Removes the specified item listener so that the item listener |
| * no longer receives item events from this check box. |
| * If l is null, no exception is thrown and no action is performed. |
| * <p>Refer to <a href="doc-files/AWTThreadIssues.html#ListenersThreads" |
| * >AWT Threading Issues</a> for details on AWT's threading model. |
| * |
| * @param l the item listener |
| * @see #addItemListener |
| * @see #getItemListeners |
| * @see java.awt.event.ItemEvent |
| * @see java.awt.event.ItemListener |
| * @since JDK1.1 |
| */ |
| public synchronized void removeItemListener(ItemListener l) { |
| if (l == null) { |
| return; |
| } |
| itemListener = AWTEventMulticaster.remove(itemListener, l); |
| } |
| |
| /** |
| * Returns an array of all the item listeners |
| * registered on this checkbox. |
| * |
| * @return all of this checkbox's <code>ItemListener</code>s |
| * or an empty array if no item |
| * listeners are currently registered |
| * |
| * @see #addItemListener |
| * @see #removeItemListener |
| * @see java.awt.event.ItemEvent |
| * @see java.awt.event.ItemListener |
| * @since 1.4 |
| */ |
| public synchronized ItemListener[] getItemListeners() { |
| return (ItemListener[]) (getListeners(ItemListener.class)); |
| } |
| |
| /** |
| * Returns an array of all the objects currently registered |
| * as <code><em>Foo</em>Listener</code>s |
| * upon this <code>Checkbox</code>. |
| * <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>Checkbox</code> <code>c</code> |
| * for its item listeners with the following code: |
| * |
| * <pre>ItemListener[] ils = (ItemListener[])(c.getListeners(ItemListener.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 checkbox, |
| * 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 #getItemListeners |
| * @since 1.3 |
| */ |
| public <T extends EventListener> T[] getListeners(Class<T> listenerType) { |
| EventListener l = null; |
| if (listenerType == ItemListener.class) { |
| l = itemListener; |
| } else { |
| return super.getListeners(listenerType); |
| } |
| return AWTEventMulticaster.getListeners(l, listenerType); |
| } |
| |
| // REMIND: remove when filtering is done at lower level |
| boolean eventEnabled(AWTEvent e) { |
| if (e.id == ItemEvent.ITEM_STATE_CHANGED) { |
| if ((eventMask & AWTEvent.ITEM_EVENT_MASK) != 0 || |
| itemListener != null) { |
| return true; |
| } |
| return false; |
| } |
| return super.eventEnabled(e); |
| } |
| |
| /** |
| * Processes events on this check box. |
| * If the event is an instance of <code>ItemEvent</code>, |
| * this method invokes the <code>processItemEvent</code> method. |
| * Otherwise, it calls its superclass's <code>processEvent</code> method. |
| * <p>Note that if the event parameter is <code>null</code> |
| * the behavior is unspecified and may result in an |
| * exception. |
| * |
| * @param e the event |
| * @see java.awt.event.ItemEvent |
| * @see #processItemEvent |
| * @since JDK1.1 |
| */ |
| protected void processEvent(AWTEvent e) { |
| if (e instanceof ItemEvent) { |
| processItemEvent((ItemEvent)e); |
| return; |
| } |
| super.processEvent(e); |
| } |
| |
| /** |
| * Processes item events occurring on this check box by |
| * dispatching them to any registered |
| * <code>ItemListener</code> objects. |
| * <p> |
| * This method is not called unless item events are |
| * enabled for this component. Item events are enabled |
| * when one of the following occurs: |
| * <p><ul> |
| * <li>An <code>ItemListener</code> object is registered |
| * via <code>addItemListener</code>. |
| * <li>Item events are enabled via <code>enableEvents</code>. |
| * </ul> |
| * <p>Note that if the event parameter is <code>null</code> |
| * the behavior is unspecified and may result in an |
| * exception. |
| * |
| * @param e the item event |
| * @see java.awt.event.ItemEvent |
| * @see java.awt.event.ItemListener |
| * @see #addItemListener |
| * @see java.awt.Component#enableEvents |
| * @since JDK1.1 |
| */ |
| protected void processItemEvent(ItemEvent e) { |
| ItemListener listener = itemListener; |
| if (listener != null) { |
| listener.itemStateChanged(e); |
| } |
| } |
| |
| /** |
| * Returns a string representing the state of this <code>Checkbox</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 the parameter string of this check box |
| */ |
| protected String paramString() { |
| String str = super.paramString(); |
| String label = this.label; |
| if (label != null) { |
| str += ",label=" + label; |
| } |
| return str + ",state=" + state; |
| } |
| |
| |
| /* Serialization support. |
| */ |
| |
| /* |
| * Serialized data version |
| * @serial |
| */ |
| private int checkboxSerializedDataVersion = 1; |
| |
| /** |
| * Writes default serializable fields to stream. Writes |
| * a list of serializable <code>ItemListeners</code> |
| * as optional data. The non-serializable |
| * <code>ItemListeners</code> are detected and |
| * no attempt is made to serialize them. |
| * |
| * @param s the <code>ObjectOutputStream</code> to write |
| * @serialData <code>null</code> terminated sequence of 0 |
| * or more pairs; the pair consists of a <code>String</code> |
| * and an <code>Object</code>; the <code>String</code> indicates |
| * the type of object and is one of the following: |
| * <code>itemListenerK</code> indicating an |
| * <code>ItemListener</code> object |
| * |
| * @see AWTEventMulticaster#save(ObjectOutputStream, String, EventListener) |
| * @see java.awt.Component#itemListenerK |
| * @see #readObject(ObjectInputStream) |
| */ |
| private void writeObject(ObjectOutputStream s) |
| throws java.io.IOException |
| { |
| s.defaultWriteObject(); |
| |
| AWTEventMulticaster.save(s, itemListenerK, itemListener); |
| s.writeObject(null); |
| } |
| |
| /** |
| * Reads the <code>ObjectInputStream</code> and if it |
| * isn't <code>null</code> adds a listener to receive |
| * item events fired by the <code>Checkbox</code>. |
| * Unrecognized keys or values will be ignored. |
| * |
| * @param s the <code>ObjectInputStream</code> to read |
| * @exception HeadlessException if |
| * <code>GraphicsEnvironment.isHeadless</code> returns |
| * <code>true</code> |
| * @serial |
| * @see #removeItemListener(ItemListener) |
| * @see #addItemListener(ItemListener) |
| * @see java.awt.GraphicsEnvironment#isHeadless |
| * @see #writeObject(ObjectOutputStream) |
| */ |
| private void readObject(ObjectInputStream s) |
| throws ClassNotFoundException, IOException, HeadlessException |
| { |
| GraphicsEnvironment.checkHeadless(); |
| s.defaultReadObject(); |
| |
| Object keyOrNull; |
| while(null != (keyOrNull = s.readObject())) { |
| String key = ((String)keyOrNull).intern(); |
| |
| if (itemListenerK == key) |
| addItemListener((ItemListener)(s.readObject())); |
| |
| else // skip value for unrecognized key |
| s.readObject(); |
| } |
| } |
| |
| /** |
| * Initialize JNI field and method ids |
| */ |
| private static native void initIDs(); |
| |
| |
| ///////////////// |
| // Accessibility support |
| //////////////// |
| |
| |
| /** |
| * Gets the AccessibleContext associated with this Checkbox. |
| * For checkboxes, the AccessibleContext takes the form of an |
| * AccessibleAWTCheckbox. |
| * A new AccessibleAWTCheckbox is created if necessary. |
| * |
| * @return an AccessibleAWTCheckbox that serves as the |
| * AccessibleContext of this Checkbox |
| * @since 1.3 |
| */ |
| public AccessibleContext getAccessibleContext() { |
| if (accessibleContext == null) { |
| accessibleContext = new AccessibleAWTCheckbox(); |
| } |
| return accessibleContext; |
| } |
| |
| /** |
| * This class implements accessibility support for the |
| * <code>Checkbox</code> class. It provides an implementation of the |
| * Java Accessibility API appropriate to checkbox user-interface elements. |
| * @since 1.3 |
| */ |
| protected class AccessibleAWTCheckbox extends AccessibleAWTComponent |
| implements ItemListener, AccessibleAction, AccessibleValue |
| { |
| /* |
| * JDK 1.3 serialVersionUID |
| */ |
| private static final long serialVersionUID = 7881579233144754107L; |
| |
| public AccessibleAWTCheckbox() { |
| super(); |
| Checkbox.this.addItemListener(this); |
| } |
| |
| /** |
| * Fire accessible property change events when the state of the |
| * toggle button changes. |
| */ |
| public void itemStateChanged(ItemEvent e) { |
| Checkbox cb = (Checkbox) e.getSource(); |
| if (Checkbox.this.accessibleContext != null) { |
| if (cb.getState()) { |
| Checkbox.this.accessibleContext.firePropertyChange( |
| AccessibleContext.ACCESSIBLE_STATE_PROPERTY, |
| null, AccessibleState.CHECKED); |
| } else { |
| Checkbox.this.accessibleContext.firePropertyChange( |
| AccessibleContext.ACCESSIBLE_STATE_PROPERTY, |
| AccessibleState.CHECKED, null); |
| } |
| } |
| } |
| |
| /** |
| * Get the AccessibleAction associated with this object. In the |
| * implementation of the Java Accessibility API for this class, |
| * return this object, which is responsible for implementing the |
| * AccessibleAction interface on behalf of itself. |
| * |
| * @return this object |
| */ |
| public AccessibleAction getAccessibleAction() { |
| return this; |
| } |
| |
| /** |
| * Get the AccessibleValue associated with this object. In the |
| * implementation of the Java Accessibility API for this class, |
| * return this object, which is responsible for implementing the |
| * AccessibleValue interface on behalf of itself. |
| * |
| * @return this object |
| */ |
| public AccessibleValue getAccessibleValue() { |
| return this; |
| } |
| |
| /** |
| * Returns the number of Actions available in this object. |
| * If there is more than one, the first one is the "default" |
| * action. |
| * |
| * @return the number of Actions in this object |
| */ |
| public int getAccessibleActionCount() { |
| return 0; // To be fully implemented in a future release |
| } |
| |
| /** |
| * Return a description of the specified action of the object. |
| * |
| * @param i zero-based index of the actions |
| */ |
| public String getAccessibleActionDescription(int i) { |
| return null; // To be fully implemented in a future release |
| } |
| |
| /** |
| * Perform the specified Action on the object |
| * |
| * @param i zero-based index of actions |
| * @return true if the the action was performed; else false. |
| */ |
| public boolean doAccessibleAction(int i) { |
| return false; // To be fully implemented in a future release |
| } |
| |
| /** |
| * Get the value of this object as a Number. If the value has not been |
| * set, the return value will be null. |
| * |
| * @return value of the object |
| * @see #setCurrentAccessibleValue |
| */ |
| public Number getCurrentAccessibleValue() { |
| return null; // To be fully implemented in a future release |
| } |
| |
| /** |
| * Set the value of this object as a Number. |
| * |
| * @return True if the value was set; else False |
| * @see #getCurrentAccessibleValue |
| */ |
| public boolean setCurrentAccessibleValue(Number n) { |
| return false; // To be fully implemented in a future release |
| } |
| |
| /** |
| * Get the minimum value of this object as a Number. |
| * |
| * @return Minimum value of the object; null if this object does not |
| * have a minimum value |
| * @see #getMaximumAccessibleValue |
| */ |
| public Number getMinimumAccessibleValue() { |
| return null; // To be fully implemented in a future release |
| } |
| |
| /** |
| * Get the maximum value of this object as a Number. |
| * |
| * @return Maximum value of the object; null if this object does not |
| * have a maximum value |
| * @see #getMinimumAccessibleValue |
| */ |
| public Number getMaximumAccessibleValue() { |
| return null; // To be fully implemented in a future release |
| } |
| |
| /** |
| * Get the role of this object. |
| * |
| * @return an instance of AccessibleRole describing the role of |
| * the object |
| * @see AccessibleRole |
| */ |
| public AccessibleRole getAccessibleRole() { |
| return AccessibleRole.CHECK_BOX; |
| } |
| |
| /** |
| * Get the state set of this object. |
| * |
| * @return an instance of AccessibleState containing the current state |
| * of the object |
| * @see AccessibleState |
| */ |
| public AccessibleStateSet getAccessibleStateSet() { |
| AccessibleStateSet states = super.getAccessibleStateSet(); |
| if (getState()) { |
| states.add(AccessibleState.CHECKED); |
| } |
| return states; |
| } |
| |
| |
| } // inner class AccessibleAWTCheckbox |
| |
| } |
