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 */ 25package javax.swing; 26 27 28import java.awt.Component; 29import 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 */ 42public 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} 69