Java example source code file (XPanelPeer.java)

This example Java source code file (XPanelPeer.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

awt, color, componentpeer, container, insets, lightweightpeer, xcanvaspeer, xembeddingcontainer, xpanelpeer

The XPanelPeer.java Java example source code

/*
 * Copyright (c) 2002, 2011, 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.
 */
package sun.awt.X11;

import java.awt.*;
import java.awt.peer.*;

import sun.awt.SunGraphicsCallback;

public class XPanelPeer extends XCanvasPeer implements PanelPeer {

    XEmbeddingContainer embedder = null; //new XEmbeddingContainer();
    /**
     * Embeds the given window into container using XEmbed protocol
     */
    public void xembed(long window) {
        if (embedder != null) {
            embedder.add(window);
        }
    }
    XPanelPeer() {}

    XPanelPeer(XCreateWindowParams params) {
        super(params);
    }

    XPanelPeer(Component target) {
        super(target);
    }

    void postInit(XCreateWindowParams params) {
        super.postInit(params);
        if (embedder != null) {
            embedder.install(this);
        }
    }

    public Insets getInsets() {
        return new Insets(0, 0, 0, 0);
    }
    public void paint(Graphics g) {
        super.paint(g);
        SunGraphicsCallback.PaintHeavyweightComponentsCallback.getInstance().
            runComponents(((Container)target).getComponents(), g,
                          SunGraphicsCallback.LIGHTWEIGHTS |
                          SunGraphicsCallback.HEAVYWEIGHTS);
    }
    public void print(Graphics g) {
        super.print(g);
        SunGraphicsCallback.PrintHeavyweightComponentsCallback.getInstance().
            runComponents(((Container)target).getComponents(), g,
                          SunGraphicsCallback.LIGHTWEIGHTS |
                          SunGraphicsCallback.HEAVYWEIGHTS);

    }

    public void setBackground(Color c) {
        Component comp;
        int i;

        Container cont = (Container) target;
        synchronized(target.getTreeLock()) {
            int n = cont.getComponentCount();
            for(i=0; i < n; i++) {
                comp = cont.getComponent(i);
                ComponentPeer peer = comp.getPeer();
                if (peer != null) {
                    Color color = comp.getBackground();
                    if (color == null || color.equals(c)) {
                        peer.setBackground(c);
                    }
                }
            }
        }
        super.setBackground(c);
    }

    public void setForeground(Color c) {
        setForegroundForHierarchy((Container) target, c);
    }

    private void setForegroundForHierarchy(Container cont, Color c) {
        synchronized(target.getTreeLock()) {
            int n = cont.getComponentCount();
            for(int i=0; i < n; i++) {
                Component comp = cont.getComponent(i);
                Color color = comp.getForeground();
                if (color == null || color.equals(c)) {
                    ComponentPeer cpeer = comp.getPeer();
                    if (cpeer != null) {
                        cpeer.setForeground(c);
                    }
                    if (cpeer instanceof LightweightPeer
                        && comp instanceof Container)
                    {
                        setForegroundForHierarchy((Container) comp, c);
                    }
                }
            }
        }
    }

    /**
     * DEPRECATED:  Replaced by getInsets().
     */
    public Insets insets() {
        return getInsets();
    }

    public void dispose() {
        if (embedder != null) {
            embedder.deinstall();
        }
        super.dispose();
    }

    protected boolean shouldFocusOnClick() {
        // Return false if this container has children so in that case it won't
        // be focused. Return true otherwise.
        return ((Container)target).getComponentCount() == 0;
    }
}