/*

 * 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.*;

/**

 * This class has been obsoleted by the 1.4 focus APIs. While client code may

 * still use this class, developers are strongly encouraged to use

 * <code>java.awt.KeyboardFocusManager</code> and

 * <code>java.awt.DefaultKeyboardFocusManager</code> instead.

 * <p>

 * Please see

 * <a href="http://docs.oracle.com/javase/tutorial/uiswing/misc/focus.html">

 * How to Use the Focus Subsystem</a>,

 * a section in <em>The Java Tutorial</em>, and the

 * <a href="../../java/awt/doc-files/FocusSpec.html">Focus Specification</a>

 * for more information.

 *

 * @see <a href="../../java/awt/doc-files/FocusSpec.html">Focus Specification</a>

 *

 * @author Arnaud Weber

 * @author David Mendenhall

 */

public abstract class FocusManager extends DefaultKeyboardFocusManager {

    /**

     * This field is obsolete, and its use is discouraged since its

     * specification is incompatible with the 1.4 focus APIs.

     * The current FocusManager is no longer a property of the UI.

     * Client code must query for the current FocusManager using

     * <code>KeyboardFocusManager.getCurrentKeyboardFocusManager()</code>.

     * See the Focus Specification for more information.

     *

     * @see java.awt.KeyboardFocusManager#getCurrentKeyboardFocusManager

     * @see <a href="../../java/awt/doc-files/FocusSpec.html">Focus Specification</a>

     */

    public static final String FOCUS_MANAGER_CLASS_PROPERTY =

        "FocusManagerClassName";

    private static boolean enabled = true;

    /**

     * Returns the current <code>KeyboardFocusManager</code> instance

     * for the calling thread's context.

     *

     * @return this thread's context's <code>KeyboardFocusManager</code>

     * @see #setCurrentManager

     */

    public static FocusManager getCurrentManager() {

        KeyboardFocusManager manager =

            KeyboardFocusManager.getCurrentKeyboardFocusManager();

        if (manager instanceof FocusManager) {

            return (FocusManager)manager;

        } else {

            return new DelegatingDefaultFocusManager(manager);

        }

    }

    /**

     * Sets the current <code>KeyboardFocusManager</code> instance

     * for the calling thread's context. If <code>null</code> is

     * specified, then the current <code>KeyboardFocusManager</code>

     * is replaced with a new instance of

     * <code>DefaultKeyboardFocusManager</code>.

     * <p>

     * If a <code>SecurityManager</code> is installed,

     * the calling thread must be granted the <code>AWTPermission</code>

     * "replaceKeyboardFocusManager" in order to replace the

     * the current <code>KeyboardFocusManager</code>.

     * If this permission is not granted,

     * this method will throw a <code>SecurityException</code>,

     * and the current <code>KeyboardFocusManager</code> will be unchanged.

     *

     * @param aFocusManager the new <code>KeyboardFocusManager</code>

     *     for this thread's context

     * @see #getCurrentManager

     * @see java.awt.DefaultKeyboardFocusManager

     * @throws SecurityException if the calling thread does not have permission

     *         to replace the current <code>KeyboardFocusManager</code>

     */

    public static void setCurrentManager(FocusManager aFocusManager)

        throws SecurityException

    {

        // Note: This method is not backward-compatible with 1.3 and earlier

        // releases. It now throws a SecurityException in an applet, whereas

        // in previous releases, it did not. This issue was discussed at

        // length, and ultimately approved by Hans.

        KeyboardFocusManager toSet =

            (aFocusManager instanceof DelegatingDefaultFocusManager)

                ? ((DelegatingDefaultFocusManager)aFocusManager).getDelegate()

                : aFocusManager;

        KeyboardFocusManager.setCurrentKeyboardFocusManager(toSet);

    }

    /**

     * Changes the current <code>KeyboardFocusManager</code>'s default

     * <code>FocusTraversalPolicy</code> to

     * <code>DefaultFocusTraversalPolicy</code>.

     *

     * @see java.awt.DefaultFocusTraversalPolicy

     * @see java.awt.KeyboardFocusManager#setDefaultFocusTraversalPolicy

     * @deprecated as of 1.4, replaced by

     * <code>KeyboardFocusManager.setDefaultFocusTraversalPolicy(FocusTraversalPolicy)</code>

     */

    @Deprecated

    public static void disableSwingFocusManager() {

        if (enabled) {

            enabled = false;

            KeyboardFocusManager.getCurrentKeyboardFocusManager().

                setDefaultFocusTraversalPolicy(

                    new DefaultFocusTraversalPolicy());

        }

    }

    /**

     * Returns whether the application has invoked

     * <code>disableSwingFocusManager()</code>.

     *

     * @see #disableSwingFocusManager

     * @deprecated As of 1.4, replaced by

     *   <code>KeyboardFocusManager.getDefaultFocusTraversalPolicy()</code>

     */

    @Deprecated

    public static boolean isFocusManagerEnabled() {

        return enabled;

    }

}