Java Swing Focus isDescendingFrom(Component focusOwner, Component parent)

Description

Returns whether the component is part of the parent's container hierarchy.

License

Open Source License

Parameter

Parameter	Description
focusOwner	a parameter
parent	a parameter

Return

true if the component is contained under the parent's hierarchy, coping with JPopupMenus.

Declaration

public static boolean isDescendingFrom(Component focusOwner,
        Component parent) 

Method Source Code

//package com.java2s;
/*// w  w w.  j  a  va 2 s.  co m
 * #%L
 * The AIBench Plugin Manager Plugin
 * %%
 * Copyright (C) 2006 - 2016 Daniel Glez-Pe?a and Florentino Fdez-Riverola
 * %%
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 * 
 * This program 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 Lesser Public License for more details.
 * 
 * You should have received a copy of the GNU General Lesser Public
 * License along with this program.  If not, see
 * <http://www.gnu.org/licenses/lgpl-3.0.html>.
 * #L%
 */

import java.awt.Component;

import javax.swing.JPopupMenu;

public class Main {
    /**
     * Returns whether the component is part of the parent's
     * container hierarchy. If a parent in the chain is of type 
     * JPopupMenu, the parent chain of its invoker is walked.
     * 
     * @param focusOwner
     * @param parent
     * @return true if the component is contained under the parent's 
     *    hierarchy, coping with JPopupMenus.
     */
    public static boolean isDescendingFrom(Component focusOwner,
            Component parent) {
        while (focusOwner != null) {
            if (focusOwner instanceof JPopupMenu) {
                focusOwner = ((JPopupMenu) focusOwner).getInvoker();
                if (focusOwner == null) {
                    return false;
                }
            }
            if (focusOwner == parent) {
                return true;
            }
            focusOwner = focusOwner.getParent();
        }
        return false;
    }
}

Related

1. installDefaultFocusHandling(Container c)
2. installFocusCycleRoot(Container c, FocusTraversalPolicy cyclePolicy)
3. installJComponentRepainterOnWindowFocusChanged( JComponent component)
4. installJComponentRepainterOnWindowFocusChanged(JComponent component)
5. installJComponentRepainterOnWindowFocusChanged(JComponent component)
6. isFocusable(Component component)
7. isFocused(Component component)
8. isFocused(Component component, boolean recoursive)
9. isParentWindowFocused(Component component)