/*

 * Copyright (c) 2000, 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.

 *

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 */

package javax.swing;

import java.awt.Component;

import java.awt.FocusTraversalPolicy;

/**

 * A FocusTraversalPolicy which can optionally provide an algorithm for

 * determining a JInternalFrame's initial Component. The initial Component is

 * the first to receive focus when the JInternalFrame is first selected. By

 * default, this is the same as the JInternalFrame's default Component to

 * focus.

 *

 * @author David Mendenhall

 *

 * @since 1.4

 */

public abstract class InternalFrameFocusTraversalPolicy

    extends FocusTraversalPolicy

{

    /**

     * Returns the Component that should receive the focus when a

     * JInternalFrame is selected for the first time. Once the JInternalFrame

     * has been selected by a call to <code>setSelected(true)</code>, the

     * initial Component will not be used again. Instead, if the JInternalFrame

     * loses and subsequently regains selection, or is made invisible or

     * undisplayable and subsequently made visible and displayable, the

     * JInternalFrame's most recently focused Component will become the focus

     * owner. The default implementation of this method returns the

     * JInternalFrame's default Component to focus.

     *

     * @param frame the JInternalFrame whose initial Component is to be

     *        returned

     * @return the Component that should receive the focus when frame is

     *         selected for the first time, or null if no suitable Component

     *         can be found

     * @see JInternalFrame#getMostRecentFocusOwner

     * @throws IllegalArgumentException if window is null

     */

    public Component getInitialComponent(JInternalFrame frame) {

        return getDefaultComponent(frame);

    }

}