Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
/**
 * A collection of small utilities for component management and reflection handling.
 * <p/>
 * <hr/> Copyright 2006-2012 Torsten Heup
 * <p/>
 * 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
 * <p/>
 * http://www.apache.org/licenses/LICENSE-2.0
 * <p/>
 * 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.
 */

import javax.swing.*;
import java.awt.*;

public class Main {
    /**
     * Returns whether a component is a direct descendant of another one. This method will traverse the component
     * hierarchy, following the 'parent' relation for normal components and the 'invoker' relation for JPopupMenu
     * instances.
     *
     * @param supposedParent The supposed ancestor component
     * @param supposedChild  The supposed child component
     * @return if 'supposedChild' is a descendant of 'supposedParent'
     */
    public static boolean isDescendant(final Component supposedParent, final Component supposedChild) {
        if (supposedParent == null)
            throw new IllegalArgumentException("Parameter 'supposedParent' must not be null!");
        if (supposedChild == null)
            throw new IllegalArgumentException("Parameter 'supposedChild' must not be null!");

        Component runner = supposedChild;
        while (runner != null) {
            if (runner == supposedParent)
                return true;
            if (runner instanceof JPopupMenu)
                runner = ((JPopupMenu) runner).getInvoker();
            else
                runner = runner.getParent();
        }
        return false;
    }

    /**
     * Returns the parent for the given component. Other than Component#getParent(), this method will work for popup
     * menus as well, returning the menu's invoker rather than its own window instance.
     *
     * @param c Component to query
     * @return Parent element of the given component.
     */
    public static synchronized Component getParent(final Component c) {
        if (c instanceof JPopupMenu)
            return ((JPopupMenu) c).getInvoker();
        else
            return c.getParent();
    }
}