Returns the first component in the tree of c that can accept the focus. - Java Swing

Java examples for Swing:JComponent

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Description

Returns the first component in the tree of c that can accept the focus.

Demo Code

/**//from  w  w w.j  a  v  a  2 s .co  m
 * $RCSfile$
 * $Revision: 128 $
 * $Date: 2004-10-25 20:42:00 -0300 (Mon, 25 Oct 2004) $
 *
 * Copyright (C) 2004-2008 Jive Software. All rights reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
//package com.java2s;
import java.awt.*;

import javax.swing.*;

public class Main {
    /**
     * Returns the first component in the tree of <code>c</code> that can accept
     * the focus.
     *
     * @param c the root of the component hierarchy to search
     * @see #focusComponentOrChild
     * @deprecated replaced by {@link #getFocusableComponentOrChild(Component, boolean)}
     */
    @Deprecated
    public static Component getFocusableComponentOrChild(Component c) {
        return getFocusableComponentOrChild(c, false);
    }

    /**
     * Returns the first component in the tree of <code>c</code> that can accept
     * the focus.
     *
     * @param c       the root of the component hierarchy to search
     * @param deepest if <code>deepest</code> is true the method will return the first and deepest component that can accept the
     *                focus.  For example, if both a child and its parent are focusable and <code>deepest</code> is true, the child is
     *                returned.
     * @see #focusComponentOrChild
     */
    public static Component getFocusableComponentOrChild(Component c,
            boolean deepest) {
        if (c != null && c.isEnabled() && c.isVisible()) {
            if (c instanceof Container) {
                Container cont = (Container) c;

                if (deepest == false) { // first one is a good one
                    if (c instanceof JComponent) {
                        JComponent jc = (JComponent) c;
                        if (jc.isRequestFocusEnabled()) {
                            return jc;
                        }
                    }
                }

                int n = cont.getComponentCount();
                for (int i = 0; i < n; i++) {
                    Component child = cont.getComponent(i);
                    Component focused = getFocusableComponentOrChild(child,
                            deepest);
                    if (focused != null) {
                        return focused;
                    }
                }

                if (c instanceof JComponent) {
                    if (deepest == true) {
                        JComponent jc = (JComponent) c;
                        if (jc.isRequestFocusEnabled()) {
                            return jc;
                        }
                    }
                } else {
                    return c;
                }
            }
        }

        return null;
    }
}

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