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    1   /*
    2    * Copyright (c) 2000, Oracle and/or its affiliates. All rights reserved.
    3    * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
    4    *
    5    * This code is free software; you can redistribute it and/or modify it
    6    * under the terms of the GNU General Public License version 2 only, as
    7    * published by the Free Software Foundation.  Oracle designates this
    8    * particular file as subject to the "Classpath" exception as provided
    9    * by Oracle in the LICENSE file that accompanied this code.
   10    *
   11    * This code is distributed in the hope that it will be useful, but WITHOUT
   12    * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
   13    * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
   14    * version 2 for more details (a copy is included in the LICENSE file that
   15    * accompanied this code).
   16    *
   17    * You should have received a copy of the GNU General Public License version
   18    * 2 along with this work; if not, write to the Free Software Foundation,
   19    * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
   20    *
   21    * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
   22    * or visit www.oracle.com if you need additional information or have any
   23    * questions.
   24    */
   25   package javax.swing;
   26   
   27   
   28   import java.awt.Component;
   29   import java.awt.FocusTraversalPolicy;
   30   
   31   /**
   32    * A FocusTraversalPolicy which can optionally provide an algorithm for
   33    * determining a JInternalFrame's initial Component. The initial Component is
   34    * the first to receive focus when the JInternalFrame is first selected. By
   35    * default, this is the same as the JInternalFrame's default Component to
   36    * focus.
   37    *
   38    * @author David Mendenhall
   39    *
   40    * @since 1.4
   41    */
   42   public abstract class InternalFrameFocusTraversalPolicy
   43       extends FocusTraversalPolicy
   44   {
   45   
   46       /**
   47        * Returns the Component that should receive the focus when a
   48        * JInternalFrame is selected for the first time. Once the JInternalFrame
   49        * has been selected by a call to <code>setSelected(true)</code>, the
   50        * initial Component will not be used again. Instead, if the JInternalFrame
   51        * loses and subsequently regains selection, or is made invisible or
   52        * undisplayable and subsequently made visible and displayable, the
   53        * JInternalFrame's most recently focused Component will become the focus
   54        * owner. The default implementation of this method returns the
   55        * JInternalFrame's default Component to focus.
   56        *
   57        * @param frame the JInternalFrame whose initial Component is to be
   58        *        returned
   59        * @return the Component that should receive the focus when frame is
   60        *         selected for the first time, or null if no suitable Component
   61        *         can be found
   62        * @see JInternalFrame#getMostRecentFocusOwner
   63        * @throws IllegalArgumentException if window is null
   64        */
   65       public Component getInitialComponent(JInternalFrame frame) {
   66           return getDefaultComponent(frame);
   67       }
   68   }

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