152 lines
6.1 KiB
Java
152 lines
6.1 KiB
Java
/*
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* Copyright (c) 1997, 2013, 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 javax.swing;
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import java.awt.*;
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/**
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* This class has been obsoleted by the 1.4 focus APIs. While client code may
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* still use this class, developers are strongly encouraged to use
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* <code>java.awt.KeyboardFocusManager</code> and
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* <code>java.awt.DefaultKeyboardFocusManager</code> instead.
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* <p>
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* Please see
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* <a href="https://docs.oracle.com/javase/tutorial/uiswing/misc/focus.html">
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* How to Use the Focus Subsystem</a>,
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* a section in <em>The Java Tutorial</em>, and the
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* <a href="../../java/awt/doc-files/FocusSpec.html">Focus Specification</a>
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* for more information.
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*
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* @see <a href="../../java/awt/doc-files/FocusSpec.html">Focus Specification</a>
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*
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* @author Arnaud Weber
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* @author David Mendenhall
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*/
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public abstract class FocusManager extends DefaultKeyboardFocusManager {
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/**
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* This field is obsolete, and its use is discouraged since its
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* specification is incompatible with the 1.4 focus APIs.
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* The current FocusManager is no longer a property of the UI.
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* Client code must query for the current FocusManager using
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* <code>KeyboardFocusManager.getCurrentKeyboardFocusManager()</code>.
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* See the Focus Specification for more information.
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*
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* @see java.awt.KeyboardFocusManager#getCurrentKeyboardFocusManager
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* @see <a href="../../java/awt/doc-files/FocusSpec.html">Focus Specification</a>
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*/
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public static final String FOCUS_MANAGER_CLASS_PROPERTY =
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"FocusManagerClassName";
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private static boolean enabled = true;
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/**
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* Returns the current <code>KeyboardFocusManager</code> instance
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* for the calling thread's context.
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*
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* @return this thread's context's <code>KeyboardFocusManager</code>
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* @see #setCurrentManager
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*/
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public static FocusManager getCurrentManager() {
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KeyboardFocusManager manager =
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KeyboardFocusManager.getCurrentKeyboardFocusManager();
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if (manager instanceof FocusManager) {
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return (FocusManager)manager;
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} else {
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return new DelegatingDefaultFocusManager(manager);
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}
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}
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/**
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* Sets the current <code>KeyboardFocusManager</code> instance
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* for the calling thread's context. If <code>null</code> is
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* specified, then the current <code>KeyboardFocusManager</code>
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* is replaced with a new instance of
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* <code>DefaultKeyboardFocusManager</code>.
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* <p>
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* If a <code>SecurityManager</code> is installed,
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* the calling thread must be granted the <code>AWTPermission</code>
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* "replaceKeyboardFocusManager" in order to replace the
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* the current <code>KeyboardFocusManager</code>.
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* If this permission is not granted,
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* this method will throw a <code>SecurityException</code>,
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* and the current <code>KeyboardFocusManager</code> will be unchanged.
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*
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* @param aFocusManager the new <code>KeyboardFocusManager</code>
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* for this thread's context
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* @see #getCurrentManager
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* @see java.awt.DefaultKeyboardFocusManager
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* @throws SecurityException if the calling thread does not have permission
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* to replace the current <code>KeyboardFocusManager</code>
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*/
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public static void setCurrentManager(FocusManager aFocusManager)
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throws SecurityException
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{
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// Note: This method is not backward-compatible with 1.3 and earlier
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// releases. It now throws a SecurityException in an applet, whereas
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// in previous releases, it did not. This issue was discussed at
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// length, and ultimately approved by Hans.
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KeyboardFocusManager toSet =
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(aFocusManager instanceof DelegatingDefaultFocusManager)
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? ((DelegatingDefaultFocusManager)aFocusManager).getDelegate()
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: aFocusManager;
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KeyboardFocusManager.setCurrentKeyboardFocusManager(toSet);
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}
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/**
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* Changes the current <code>KeyboardFocusManager</code>'s default
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* <code>FocusTraversalPolicy</code> to
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* <code>DefaultFocusTraversalPolicy</code>.
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*
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* @see java.awt.DefaultFocusTraversalPolicy
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* @see java.awt.KeyboardFocusManager#setDefaultFocusTraversalPolicy
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* @deprecated as of 1.4, replaced by
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* <code>KeyboardFocusManager.setDefaultFocusTraversalPolicy(FocusTraversalPolicy)</code>
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*/
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@Deprecated
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public static void disableSwingFocusManager() {
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if (enabled) {
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enabled = false;
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KeyboardFocusManager.getCurrentKeyboardFocusManager().
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setDefaultFocusTraversalPolicy(
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new DefaultFocusTraversalPolicy());
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}
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}
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/**
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* Returns whether the application has invoked
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* <code>disableSwingFocusManager()</code>.
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*
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* @see #disableSwingFocusManager
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* @deprecated As of 1.4, replaced by
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* <code>KeyboardFocusManager.getDefaultFocusTraversalPolicy()</code>
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*/
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@Deprecated
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public static boolean isFocusManagerEnabled() {
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return enabled;
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}
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}
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