/*
 * Copyright 2002-2007 Sun Microsystems, Inc.  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.  Sun designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
 * CA 95054 USA or visit www.sun.com if you need additional information or
 * have any questions.
 */

package com.sun.java.swing;

import sun.awt.AppContext;
import java.awt.Component;
import javax.swing.JComponent;
import javax.swing.RepaintManager;

/**
 * A collection of utility methods for Swing.
 * <p>
 * <b>WARNING:</b> While this class is public, it should not be treated as
 * public API and its API may change in incompatable ways between dot dot
 * releases and even patch releases. You should not rely on this class even
 * existing.
 *
 * This is a second part of sun.swing.SwingUtilities2. It is required
 * to provide services for JavaFX applets.
 *
 */
public class SwingUtilities3 {
    /**
     * The {@code clientProperty} key for delegate {@code RepaintManager}
     */
    private static final Object DELEGATE_REPAINT_MANAGER_KEY =
        new StringBuilder("DelegateRepaintManagerKey");

    /**
      * Registers delegate RepaintManager for {@code JComponent}.
      */
    public static void setDelegateRepaintManager(JComponent component,
                                                RepaintManager repaintManager) {
        /* setting up flag in AppContext to speed up lookups in case
         * there are no delegate RepaintManagers used.
         */
        AppContext.getAppContext().put(DELEGATE_REPAINT_MANAGER_KEY,
                                       Boolean.TRUE);

        component.putClientProperty(DELEGATE_REPAINT_MANAGER_KEY,
                                    repaintManager);
    }

    /**
     * Returns delegate {@code RepaintManager} for {@code component} hierarchy.
     */
    public static RepaintManager getDelegateRepaintManager(Component
                                                            component) {
        RepaintManager delegate = null;
        if (Boolean.TRUE == AppContext.getAppContext().get(
                                               DELEGATE_REPAINT_MANAGER_KEY)) {
            while (delegate == null && component != null) {
                while (component != null
                         && ! (component instanceof JComponent)) {
                    component = component.getParent();
                }
                if (component != null) {
                    delegate = (RepaintManager)
                        ((JComponent) component)
                          .getClientProperty(DELEGATE_REPAINT_MANAGER_KEY);
                    component = component.getParent();
                }

            }
        }
        return delegate;
    }
}