Special simple layout used in TabbedContainer : Customized Layout « Swing JFC « Java

Special simple layout used in TabbedContainer

 * Copyright 1997-2007 Sun Microsystems, Inc. All rights reserved.
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common
 * Development and Distribution License("CDDL") (collectively, the
 * "License"). You may not use this file except in compliance with the
 * License. You can obtain a copy of the License at
 * http://www.netbeans.org/cddl-gplv2.html
 * or nbbuild/licenses/CDDL-GPL-2-CP. See the License for the
 * specific language governing permissions and limitations under the
 * License.  When distributing the software, include this License Header
 * Notice in each file and include the License file at
 * nbbuild/licenses/CDDL-GPL-2-CP.  Sun designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Sun in the GPL Version 2 section of the License file that
 * accompanied this code. If applicable, add the following below the
 * License Header, with the fields enclosed by brackets [] replaced by
 * your own identifying information:
 * "Portions Copyrighted [year] [name of copyright owner]"
 * Contributor(s):
 * The Original Software is NetBeans. The Initial Developer of the Original
 * Software is Sun Microsystems, Inc. Portions Copyright 1997-2006 Sun
 * Microsystems, Inc. All Rights Reserved.
 * If you wish your version of this file to be governed by only the CDDL
 * or only the GPL Version 2, indicate your decision by adding
 * "[Contributor] elects to include this software in this distribution
 * under the [CDDL or GPL Version 2] license." If you do not indicate a
 * single choice of license, a recipient has the option to distribute
 * your version of this file under either the CDDL, the GPL Version 2 or
 * to extend the choice of license to its licensees as provided above.
 * However, if you add GPL Version 2 code and therefore, elected the GPL
 * Version 2 license, then the option applies only if the new code is
 * made subject to such option by the copyright holder.

import java.awt.Component;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.Insets;
import java.awt.LayoutManager;
import java.lang.ref.WeakReference;

import javax.swing.JComponent;

 * Special simple layout used in TabbedContainer. Shows component in the
 * "stack", it means that only one component is visible at any time, others are
 * always hidden "below" the visible one. Use method showComponent to select
 * visible component.
 * @author Dafe Simonek
class StackLayout implements LayoutManager {
    // #100486 - hold visibleComp weakly, because removeLayoutComponent may not
    // be called and then visibleComp is not freed. See StackLayoutTest for details.
     * Holds currently visible component or null if no comp is visible
    private WeakReference<Component> visibleComp = null;

     * Set the currently displayed component.  If passed null for the component,
     * all contained components will be made invisible (sliding windows do this)
     * @param c Component to show
     * @param parent Parent container
    public void showComponent(Component c, Container parent) {
        Component comp = getVisibleComponent();
        if (comp != c) {
            if (!parent.isAncestorOf(c) && c != null) {
            synchronized (parent.getTreeLock()) {
                if (comp != null) {
                visibleComp = new WeakReference<Component>(c);
                if (c != null) {
    // trigger re-layout
    if (c instanceof JComponent) {
    else {
        parent.validate(); //XXX revalidate should work!
    /** Allows support for content policies 
     * @return Currently visible component or null
    public Component getVisibleComponent() {
        return visibleComp == null ? null : visibleComp.get();

     * ********** Implementation of LayoutManager interface *********

    public void addLayoutComponent(String name, Component comp) {
        synchronized (comp.getTreeLock()) {
            // keep consistency if showComponent was already called on this
            // component before
            if (comp == getVisibleComponent()) {
                visibleComp = null;
/*System.out.println("Border dump for " + comp.getName());
borderDump((javax.swing.JComponent)comp, "");*/
/*private void borderDump (javax.swing.JComponent comp, String space) {
    javax.swing.border.Border compBorder = comp.getBorder();
    if (compBorder == null) {
        System.out.println(space + comp.getClass().getName() + " has no border.");
    } else {
        System.out.println(space + comp.getClass().getName() + ": " + compBorder.getClass().getName());
    Component curComp;
    for (int i = 0; i < comp.getComponentCount(); i++) {
        curComp = comp.getComponent(i);
        if (curComp instanceof javax.swing.JComponent) {
            borderDump((javax.swing.JComponent)curComp, space + " ");
    public void removeLayoutComponent(Component comp) {
        synchronized (comp.getTreeLock()) {
            if (comp == getVisibleComponent()) {
                visibleComp = null;
            // kick out removed component as visible, so that others
            // don't have problems with hidden components

    public void layoutContainer(Container parent) {
        Component visibleComp = getVisibleComponent();
        if (visibleComp != null) {
            synchronized (parent.getTreeLock()) {
                Insets insets = parent.getInsets();
                visibleComp.setBounds(insets.left, insets.top, parent.getWidth()
                   - (insets.left + insets.right), parent.getHeight()
                   - (insets.top + insets.bottom));

    public Dimension minimumLayoutSize(Container parent) {
        return getEmptySize();

    public Dimension preferredLayoutSize(Container parent) {
        return getEmptySize();

     * Specifies default size of empty container
    private static Dimension getEmptySize() {
        return new Dimension(50, 50);



Related examples in the same category

1.Custom layout: EdgeLayout
2.Customized layout managerCustomized layout manager
4.Applet GUI demo of TreeLayout layout manager
5.Relative Layout Manager for Java J2SE
6.Basically two (or more) columns of different, but constant, widths
8.Table Layout
9.Table Layout implements LayoutManager2
10.Table layout manager
11.Flex Layout
12.Square Layout
13.Center Layout
14.Wrapper Layout
15.Tile Layout
16.Custom Layout DemoCustom Layout Demo
17.X Y Layout
18.DividerLayout is layout that divides two components with the column of actions
19.Stack Layout, uses an orientation to determine if the contents should be arranged horizontally or vertically.
20.A simple layoutmanager to overlay all components of a parent.
21.A layout manager that displays a single component in the center of its container.
22.A layout manager that spaces components over six columns in seven different formats.
23.Compents are laid out in a circle.
24.Place components at exact locations (x, y, width, height) and then determine how they behave when the window containing them (their parent) is resized
25.Specialised layout manager for a grid of components.