author | serb |
Mon, 09 Sep 2019 12:23:22 -0700 | |
changeset 58325 | d32a3b1ca84a |
parent 47216 | 71c04702a3d5 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 1995, 2019, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. Oracle designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Oracle in the LICENSE file that accompanied this code. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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package java.awt; |
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import java.awt.event.ItemEvent; |
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import java.awt.event.ItemListener; |
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import java.awt.peer.CheckboxMenuItemPeer; |
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import java.io.IOException; |
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import java.io.ObjectInputStream; |
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import java.io.ObjectOutputStream; |
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import java.util.EventListener; |
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import javax.accessibility.Accessible; |
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import javax.accessibility.AccessibleAction; |
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import javax.accessibility.AccessibleContext; |
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import javax.accessibility.AccessibleRole; |
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import javax.accessibility.AccessibleValue; |
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import sun.awt.AWTAccessor; |
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/** |
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* This class represents a check box that can be included in a menu. |
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* Selecting the check box in the menu changes its state from |
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* "on" to "off" or from "off" to "on." |
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* <p> |
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* The following picture depicts a menu which contains an instance |
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* of {@code CheckBoxMenuItem}: |
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* <p> |
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* <img src="doc-files/MenuBar-1.gif" |
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* alt="Menu labeled Examples, containing items Basic, Simple, Check, and More |
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* Examples. The Check item is a CheckBoxMenuItem instance, in the off state." |
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* style="margin: 7px 10px;"> |
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* <p> |
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* The item labeled {@code Check} shows a check box menu item |
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* in its "off" state. |
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* <p> |
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* When a check box menu item is selected, AWT sends an item event to |
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* the item. Since the event is an instance of {@code ItemEvent}, |
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* the {@code processEvent} method examines the event and passes |
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* it along to {@code processItemEvent}. The latter method redirects |
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* the event to any {@code ItemListener} objects that have |
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* registered an interest in item events generated by this menu item. |
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* |
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* @author Sami Shaio |
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* @see java.awt.event.ItemEvent |
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* @see java.awt.event.ItemListener |
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* @since 1.0 |
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*/ |
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public class CheckboxMenuItem extends MenuItem implements ItemSelectable, Accessible { |
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static { |
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/* ensure that the necessary native libraries are loaded */ |
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Toolkit.loadLibraries(); |
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if (!GraphicsEnvironment.isHeadless()) { |
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initIDs(); |
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} |
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AWTAccessor.setCheckboxMenuItemAccessor( |
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new AWTAccessor.CheckboxMenuItemAccessor() { |
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public boolean getState(CheckboxMenuItem cmi) { |
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return cmi.state; |
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} |
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}); |
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} |
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/** |
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* The state of a checkbox menu item |
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* @serial |
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* @see #getState() |
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* @see #setState(boolean) |
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*/ |
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private volatile boolean state; |
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private transient volatile ItemListener itemListener; |
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private static final String base = "chkmenuitem"; |
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private static int nameCounter = 0; |
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/* |
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* JDK 1.1 serialVersionUID |
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*/ |
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private static final long serialVersionUID = 6190621106981774043L; |
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/** |
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* Create a check box menu item with an empty label. |
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* The item's state is initially set to "off." |
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* @exception HeadlessException if GraphicsEnvironment.isHeadless() |
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* returns true |
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* @see java.awt.GraphicsEnvironment#isHeadless |
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* @since 1.1 |
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*/ |
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public CheckboxMenuItem() throws HeadlessException { |
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this("", false); |
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} |
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/** |
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* Create a check box menu item with the specified label. |
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* The item's state is initially set to "off." |
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* @param label a string label for the check box menu item, |
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* or {@code null} for an unlabeled menu item. |
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* @exception HeadlessException if GraphicsEnvironment.isHeadless() |
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* returns true |
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* @see java.awt.GraphicsEnvironment#isHeadless |
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*/ |
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public CheckboxMenuItem(String label) throws HeadlessException { |
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this(label, false); |
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} |
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/** |
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* Create a check box menu item with the specified label and state. |
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* @param label a string label for the check box menu item, |
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* or {@code null} for an unlabeled menu item. |
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* @param state the initial state of the menu item, where |
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* {@code true} indicates "on" and |
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* {@code false} indicates "off." |
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* @exception HeadlessException if GraphicsEnvironment.isHeadless() |
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* returns true |
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* @see java.awt.GraphicsEnvironment#isHeadless |
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* @since 1.1 |
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*/ |
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public CheckboxMenuItem(String label, boolean state) |
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throws HeadlessException { |
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super(label); |
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this.state = state; |
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} |
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/** |
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* Construct a name for this MenuComponent. Called by getName() when |
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* the name is null. |
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*/ |
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String constructComponentName() { |
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synchronized (CheckboxMenuItem.class) { |
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return base + nameCounter++; |
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} |
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} |
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/** |
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* Creates the peer of the checkbox item. This peer allows us to |
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* change the look of the checkbox item without changing its |
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* functionality. |
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* Most applications do not call this method directly. |
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* @see java.awt.Component#getToolkit() |
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*/ |
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public void addNotify() { |
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synchronized (getTreeLock()) { |
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if (peer == null) |
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peer = getComponentFactory().createCheckboxMenuItem(this); |
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super.addNotify(); |
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} |
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} |
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/** |
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* Determines whether the state of this check box menu item |
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* is "on" or "off." |
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* |
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* @return the state of this check box menu item, where |
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* {@code true} indicates "on" and |
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* {@code false} indicates "off" |
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* @see #setState |
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*/ |
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public boolean getState() { |
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return state; |
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} |
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/** |
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* Sets this check box menu item to the specified state. |
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* The boolean value {@code true} indicates "on" while |
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* {@code false} indicates "off." |
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* |
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* <p>Note that this method should be primarily used to |
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* initialize the state of the check box menu item. |
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* Programmatically setting the state of the check box |
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* menu item will <i>not</i> trigger |
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* an {@code ItemEvent}. The only way to trigger an |
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* {@code ItemEvent} is by user interaction. |
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* |
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* @param b {@code true} if the check box |
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* menu item is on, otherwise {@code false} |
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* @see #getState |
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*/ |
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public synchronized void setState(boolean b) { |
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state = b; |
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CheckboxMenuItemPeer peer = (CheckboxMenuItemPeer)this.peer; |
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if (peer != null) { |
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peer.setState(b); |
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} |
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} |
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/** |
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* Returns the an array (length 1) containing the checkbox menu item |
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* label or null if the checkbox is not selected. |
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* @see ItemSelectable |
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*/ |
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public synchronized Object[] getSelectedObjects() { |
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if (state) { |
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Object[] items = new Object[1]; |
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items[0] = label; |
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return items; |
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} |
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return null; |
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} |
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/** |
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* Adds the specified item listener to receive item events from |
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* this check box menu item. Item events are sent in response to user |
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* actions, but not in response to calls to setState(). |
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* If l is null, no exception is thrown and no action is performed. |
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* <p>Refer to <a href="doc-files/AWTThreadIssues.html#ListenersThreads" |
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* >AWT Threading Issues</a> for details on AWT's threading model. |
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* |
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* @param l the item listener |
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* @see #removeItemListener |
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* @see #getItemListeners |
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* @see #setState |
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* @see java.awt.event.ItemEvent |
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* @see java.awt.event.ItemListener |
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* @since 1.1 |
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*/ |
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public synchronized void addItemListener(ItemListener l) { |
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if (l == null) { |
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return; |
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} |
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itemListener = AWTEventMulticaster.add(itemListener, l); |
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newEventsOnly = true; |
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} |
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/** |
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* Removes the specified item listener so that it no longer receives |
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* item events from this check box menu item. |
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* If l is null, no exception is thrown and no action is performed. |
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* <p>Refer to <a href="doc-files/AWTThreadIssues.html#ListenersThreads" |
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* >AWT Threading Issues</a> for details on AWT's threading model. |
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* |
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* @param l the item listener |
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* @see #addItemListener |
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* @see #getItemListeners |
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* @see java.awt.event.ItemEvent |
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* @see java.awt.event.ItemListener |
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* @since 1.1 |
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*/ |
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public synchronized void removeItemListener(ItemListener l) { |
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if (l == null) { |
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return; |
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} |
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itemListener = AWTEventMulticaster.remove(itemListener, l); |
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} |
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/** |
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* Returns an array of all the item listeners |
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* registered on this checkbox menuitem. |
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* |
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* @return all of this checkbox menuitem's {@code ItemListener}s |
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* or an empty array if no item |
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* listeners are currently registered |
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* |
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* @see #addItemListener |
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* @see #removeItemListener |
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* @see java.awt.event.ItemEvent |
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* @see java.awt.event.ItemListener |
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* @since 1.4 |
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*/ |
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public synchronized ItemListener[] getItemListeners() { |
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return getListeners(ItemListener.class); |
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} |
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/** |
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* Returns an array of all the objects currently registered |
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* as <code><em>Foo</em>Listener</code>s |
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* upon this {@code CheckboxMenuItem}. |
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* <code><em>Foo</em>Listener</code>s are registered using the |
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* <code>add<em>Foo</em>Listener</code> method. |
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* |
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* <p> |
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* You can specify the {@code listenerType} argument |
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* with a class literal, such as |
300 |
* <code><em>Foo</em>Listener.class</code>. |
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* For example, you can query a |
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* {@code CheckboxMenuItem c} |
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* for its item listeners with the following code: |
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* |
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* <pre>ItemListener[] ils = (ItemListener[])(c.getListeners(ItemListener.class));</pre> |
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* |
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* If no such listeners exist, this method returns an empty array. |
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* |
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* @param listenerType the type of listeners requested; this parameter |
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* should specify an interface that descends from |
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* {@code java.util.EventListener} |
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* @return an array of all objects registered as |
313 |
* <code><em>Foo</em>Listener</code>s on this checkbox menuitem, |
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* or an empty array if no such |
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* listeners have been added |
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* @exception ClassCastException if {@code listenerType} |
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* doesn't specify a class or interface that implements |
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* {@code java.util.EventListener} |
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* |
320 |
* @see #getItemListeners |
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* @since 1.3 |
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*/ |
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public <T extends EventListener> T[] getListeners(Class<T> listenerType) { |
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EventListener l = null; |
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325 |
if (listenerType == ItemListener.class) { |
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l = itemListener; |
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} else { |
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return super.getListeners(listenerType); |
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} |
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return AWTEventMulticaster.getListeners(l, listenerType); |
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} |
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// REMIND: remove when filtering is done at lower level |
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boolean eventEnabled(AWTEvent e) { |
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if (e.id == ItemEvent.ITEM_STATE_CHANGED) { |
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if ((eventMask & AWTEvent.ITEM_EVENT_MASK) != 0 || |
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itemListener != null) { |
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return true; |
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339 |
} |
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return false; |
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} |
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return super.eventEnabled(e); |
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} |
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/** |
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* Processes events on this check box menu item. |
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* If the event is an instance of {@code ItemEvent}, |
348 |
* this method invokes the {@code processItemEvent} method. |
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* If the event is not an item event, |
35667 | 350 |
* it invokes {@code processEvent} on the superclass. |
2 | 351 |
* <p> |
352 |
* Check box menu items currently support only item events. |
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35667 | 353 |
* <p>Note that if the event parameter is {@code null} |
2 | 354 |
* the behavior is unspecified and may result in an |
355 |
* exception. |
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356 |
* |
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357 |
* @param e the event |
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358 |
* @see java.awt.event.ItemEvent |
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359 |
* @see #processItemEvent |
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* @since 1.1 |
2 | 361 |
*/ |
362 |
protected void processEvent(AWTEvent e) { |
|
363 |
if (e instanceof ItemEvent) { |
|
364 |
processItemEvent((ItemEvent)e); |
|
365 |
return; |
|
366 |
} |
|
367 |
super.processEvent(e); |
|
368 |
} |
|
369 |
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370 |
/** |
|
371 |
* Processes item events occurring on this check box menu item by |
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35667 | 372 |
* dispatching them to any registered {@code ItemListener} objects. |
2 | 373 |
* <p> |
374 |
* This method is not called unless item events are |
|
375 |
* enabled for this menu item. Item events are enabled |
|
376 |
* when one of the following occurs: |
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* <ul> |
35667 | 378 |
* <li>An {@code ItemListener} object is registered |
379 |
* via {@code addItemListener}. |
|
380 |
* <li>Item events are enabled via {@code enableEvents}. |
|
2 | 381 |
* </ul> |
35667 | 382 |
* <p>Note that if the event parameter is {@code null} |
2 | 383 |
* the behavior is unspecified and may result in an |
384 |
* exception. |
|
385 |
* |
|
386 |
* @param e the item event |
|
387 |
* @see java.awt.event.ItemEvent |
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* @see java.awt.event.ItemListener |
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* @see #addItemListener |
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* @see java.awt.MenuItem#enableEvents |
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* @since 1.1 |
2 | 392 |
*/ |
393 |
protected void processItemEvent(ItemEvent e) { |
|
394 |
ItemListener listener = itemListener; |
|
395 |
if (listener != null) { |
|
396 |
listener.itemStateChanged(e); |
|
397 |
} |
|
398 |
} |
|
399 |
||
400 |
/* |
|
401 |
* Post an ItemEvent and toggle state. |
|
402 |
*/ |
|
403 |
void doMenuEvent(long when, int modifiers) { |
|
404 |
setState(!state); |
|
405 |
Toolkit.getEventQueue().postEvent( |
|
406 |
new ItemEvent(this, ItemEvent.ITEM_STATE_CHANGED, |
|
407 |
getLabel(), |
|
408 |
state ? ItemEvent.SELECTED : |
|
409 |
ItemEvent.DESELECTED)); |
|
410 |
} |
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411 |
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412 |
/** |
|
413 |
* Returns a string representing the state of this |
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35667 | 414 |
* {@code CheckBoxMenuItem}. This |
2 | 415 |
* method is intended to be used only for debugging purposes, and the |
416 |
* content and format of the returned string may vary between |
|
417 |
* implementations. The returned string may be empty but may not be |
|
35667 | 418 |
* {@code null}. |
2 | 419 |
* |
420 |
* @return the parameter string of this check box menu item |
|
421 |
*/ |
|
422 |
public String paramString() { |
|
423 |
return super.paramString() + ",state=" + state; |
|
424 |
} |
|
425 |
||
426 |
/* Serialization support. |
|
427 |
*/ |
|
428 |
||
429 |
/* |
|
430 |
* Serial Data Version |
|
431 |
* @serial |
|
432 |
*/ |
|
433 |
private int checkboxMenuItemSerializedDataVersion = 1; |
|
434 |
||
435 |
/** |
|
436 |
* Writes default serializable fields to stream. Writes |
|
35667 | 437 |
* a list of serializable {@code ItemListeners} |
2 | 438 |
* as optional data. The non-serializable |
35667 | 439 |
* {@code ItemListeners} are detected and |
2 | 440 |
* no attempt is made to serialize them. |
441 |
* |
|
35667 | 442 |
* @param s the {@code ObjectOutputStream} to write |
443 |
* @serialData {@code null} terminated sequence of |
|
444 |
* 0 or more pairs; the pair consists of a {@code String} |
|
445 |
* and an {@code Object}; the {@code String} indicates |
|
2 | 446 |
* the type of object and is one of the following: |
35667 | 447 |
* {@code itemListenerK} indicating an |
448 |
* {@code ItemListener} object |
|
2 | 449 |
* |
450 |
* @see AWTEventMulticaster#save(ObjectOutputStream, String, EventListener) |
|
451 |
* @see java.awt.Component#itemListenerK |
|
452 |
* @see #readObject(ObjectInputStream) |
|
453 |
*/ |
|
454 |
private void writeObject(ObjectOutputStream s) |
|
455 |
throws java.io.IOException |
|
456 |
{ |
|
457 |
s.defaultWriteObject(); |
|
458 |
||
459 |
AWTEventMulticaster.save(s, itemListenerK, itemListener); |
|
460 |
s.writeObject(null); |
|
461 |
} |
|
462 |
||
463 |
/* |
|
35667 | 464 |
* Reads the {@code ObjectInputStream} and if it |
465 |
* isn't {@code null} adds a listener to receive |
|
466 |
* item events fired by the {@code Checkbox} menu item. |
|
2 | 467 |
* Unrecognized keys or values will be ignored. |
468 |
* |
|
35667 | 469 |
* @param s the {@code ObjectInputStream} to read |
2 | 470 |
* @serial |
471 |
* @see removeActionListener() |
|
472 |
* @see addActionListener() |
|
473 |
* @see #writeObject |
|
474 |
*/ |
|
475 |
private void readObject(ObjectInputStream s) |
|
476 |
throws ClassNotFoundException, IOException |
|
477 |
{ |
|
478 |
s.defaultReadObject(); |
|
479 |
||
480 |
Object keyOrNull; |
|
481 |
while(null != (keyOrNull = s.readObject())) { |
|
482 |
String key = ((String)keyOrNull).intern(); |
|
483 |
||
484 |
if (itemListenerK == key) |
|
485 |
addItemListener((ItemListener)(s.readObject())); |
|
486 |
||
487 |
else // skip value for unrecognized key |
|
488 |
s.readObject(); |
|
489 |
} |
|
490 |
} |
|
491 |
||
492 |
/** |
|
493 |
* Initialize JNI field and method IDs |
|
494 |
*/ |
|
495 |
private static native void initIDs(); |
|
496 |
||
497 |
||
498 |
///////////////// |
|
499 |
// Accessibility support |
|
500 |
//////////////// |
|
501 |
||
502 |
/** |
|
503 |
* Gets the AccessibleContext associated with this CheckboxMenuItem. |
|
504 |
* For checkbox menu items, the AccessibleContext takes the |
|
505 |
* form of an AccessibleAWTCheckboxMenuItem. |
|
506 |
* A new AccessibleAWTCheckboxMenuItem is created if necessary. |
|
507 |
* |
|
508 |
* @return an AccessibleAWTCheckboxMenuItem that serves as the |
|
509 |
* AccessibleContext of this CheckboxMenuItem |
|
510 |
* @since 1.3 |
|
511 |
*/ |
|
512 |
public AccessibleContext getAccessibleContext() { |
|
513 |
if (accessibleContext == null) { |
|
514 |
accessibleContext = new AccessibleAWTCheckboxMenuItem(); |
|
515 |
} |
|
516 |
return accessibleContext; |
|
517 |
} |
|
518 |
||
519 |
/** |
|
520 |
* Inner class of CheckboxMenuItem used to provide default support for |
|
521 |
* accessibility. This class is not meant to be used directly by |
|
522 |
* application developers, but is instead meant only to be |
|
523 |
* subclassed by menu component developers. |
|
524 |
* <p> |
|
525 |
* This class implements accessibility support for the |
|
35667 | 526 |
* {@code CheckboxMenuItem} class. It provides an implementation |
2 | 527 |
* of the Java Accessibility API appropriate to checkbox menu item |
528 |
* user-interface elements. |
|
529 |
* @since 1.3 |
|
530 |
*/ |
|
531 |
protected class AccessibleAWTCheckboxMenuItem extends AccessibleAWTMenuItem |
|
532 |
implements AccessibleAction, AccessibleValue |
|
533 |
{ |
|
534 |
/* |
|
535 |
* JDK 1.3 serialVersionUID |
|
536 |
*/ |
|
537 |
private static final long serialVersionUID = -1122642964303476L; |
|
538 |
||
539 |
/** |
|
540 |
* Get the AccessibleAction associated with this object. In the |
|
541 |
* implementation of the Java Accessibility API for this class, |
|
542 |
* return this object, which is responsible for implementing the |
|
543 |
* AccessibleAction interface on behalf of itself. |
|
544 |
* |
|
545 |
* @return this object |
|
546 |
*/ |
|
547 |
public AccessibleAction getAccessibleAction() { |
|
548 |
return this; |
|
549 |
} |
|
550 |
||
551 |
/** |
|
552 |
* Get the AccessibleValue associated with this object. In the |
|
553 |
* implementation of the Java Accessibility API for this class, |
|
554 |
* return this object, which is responsible for implementing the |
|
555 |
* AccessibleValue interface on behalf of itself. |
|
556 |
* |
|
557 |
* @return this object |
|
558 |
*/ |
|
559 |
public AccessibleValue getAccessibleValue() { |
|
560 |
return this; |
|
561 |
} |
|
562 |
||
563 |
/** |
|
564 |
* Returns the number of Actions available in this object. |
|
565 |
* If there is more than one, the first one is the "default" |
|
566 |
* action. |
|
567 |
* |
|
568 |
* @return the number of Actions in this object |
|
569 |
*/ |
|
570 |
public int getAccessibleActionCount() { |
|
571 |
return 0; // To be fully implemented in a future release |
|
572 |
} |
|
573 |
||
574 |
/** |
|
575 |
* Return a description of the specified action of the object. |
|
576 |
* |
|
577 |
* @param i zero-based index of the actions |
|
578 |
*/ |
|
579 |
public String getAccessibleActionDescription(int i) { |
|
580 |
return null; // To be fully implemented in a future release |
|
581 |
} |
|
582 |
||
583 |
/** |
|
584 |
* Perform the specified Action on the object |
|
585 |
* |
|
586 |
* @param i zero-based index of actions |
|
587 |
* @return true if the action was performed; otherwise false. |
|
588 |
*/ |
|
589 |
public boolean doAccessibleAction(int i) { |
|
590 |
return false; // To be fully implemented in a future release |
|
591 |
} |
|
592 |
||
593 |
/** |
|
594 |
* Get the value of this object as a Number. If the value has not been |
|
595 |
* set, the return value will be null. |
|
596 |
* |
|
597 |
* @return value of the object |
|
598 |
* @see #setCurrentAccessibleValue |
|
599 |
*/ |
|
600 |
public Number getCurrentAccessibleValue() { |
|
601 |
return null; // To be fully implemented in a future release |
|
602 |
} |
|
603 |
||
604 |
/** |
|
605 |
* Set the value of this object as a Number. |
|
606 |
* |
|
607 |
* @return true if the value was set; otherwise false |
|
608 |
* @see #getCurrentAccessibleValue |
|
609 |
*/ |
|
610 |
public boolean setCurrentAccessibleValue(Number n) { |
|
611 |
return false; // To be fully implemented in a future release |
|
612 |
} |
|
613 |
||
614 |
/** |
|
615 |
* Get the minimum value of this object as a Number. |
|
616 |
* |
|
617 |
* @return Minimum value of the object; null if this object does not |
|
618 |
* have a minimum value |
|
619 |
* @see #getMaximumAccessibleValue |
|
620 |
*/ |
|
621 |
public Number getMinimumAccessibleValue() { |
|
622 |
return null; // To be fully implemented in a future release |
|
623 |
} |
|
624 |
||
625 |
/** |
|
626 |
* Get the maximum value of this object as a Number. |
|
627 |
* |
|
628 |
* @return Maximum value of the object; null if this object does not |
|
629 |
* have a maximum value |
|
630 |
* @see #getMinimumAccessibleValue |
|
631 |
*/ |
|
632 |
public Number getMaximumAccessibleValue() { |
|
633 |
return null; // To be fully implemented in a future release |
|
634 |
} |
|
635 |
||
636 |
/** |
|
637 |
* Get the role of this object. |
|
638 |
* |
|
639 |
* @return an instance of AccessibleRole describing the role of the |
|
640 |
* object |
|
641 |
*/ |
|
642 |
public AccessibleRole getAccessibleRole() { |
|
643 |
return AccessibleRole.CHECK_BOX; |
|
644 |
} |
|
645 |
||
646 |
} // class AccessibleAWTMenuItem |
|
647 |
||
648 |
} |