Main.java Source code

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Here is the source code for Main.java

Source

//package com.java2s;
/*
 * Copyright (c) 2002, 2010, 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.
 *
 * 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.
 */

import java.awt.*;

import javax.swing.*;

public class Main {
    public static Component compositeRequestFocus(Component component) {
        if (component instanceof Container) {
            Container container = (Container) component;
            if (container.isFocusCycleRoot()) {
                FocusTraversalPolicy policy = container.getFocusTraversalPolicy();
                Component comp = policy.getDefaultComponent(container);
                if (comp != null) {
                    comp.requestFocus();
                    return comp;
                }
            }
            Container rootAncestor = container.getFocusCycleRootAncestor();
            if (rootAncestor != null) {
                FocusTraversalPolicy policy = rootAncestor.getFocusTraversalPolicy();
                Component comp = policy.getComponentAfter(rootAncestor, container);

                if (comp != null && SwingUtilities.isDescendingFrom(comp, container)) {
                    comp.requestFocus();
                    return comp;
                }
            }
        }
        if (component.isFocusable()) {
            component.requestFocus();
            return component;
        }
        return null;
    }
}