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   * Copyright 1997-2010 Oracle and/or its affiliates. All rights reserved.
   * Oracle and Java are registered trademarks of Oracle and/or its affiliates.
   * Other names may be trademarks of their respective owners.
   * 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
  * 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.  Oracle designates this
  * particular file as subject to the "Classpath" exception as provided
  * by Oracle 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 1997-2007 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.Shape;
 import java.util.Map;
Class ExpanderWidget provides a simple icon widget for controlling the expanded/collapsed state of another widget. This widget can be added to any widget, and given an instance of ExpandableWidget, it can make that object expand or collapse each time the icon is clicked by the user. It is up to the ExpandableWidget implementation to determine how the size of the widget is altered. This class provides one or more methods for altering the widget size.

Ajit Bhate
Nathan Fiedler
 public class ExpanderWidget extends ButtonWidget {

Cache of the expanded state of ExpandableWidget instances. This is used to restore the original state of an expandable if it is created again, say as a result of an undo/redo operation.
     private static Map<ObjectBooleanexpandedCache;
The expandable (content) widget.
     private ExpandableWidget expandable;
     static {
          = new WeakHashMap<ObjectBoolean>();

Creates a new instance of ExpanderWidget.

scene the Scene to contain this widget.
expandable the expandable widget this expander will control.
expanded true if widget is initially expanded, false if collapsed.
     public ExpanderWidget(Scene sceneExpandableWidget expandableboolean expanded) {
         super(scene, (Stringnull);
         this. = expandable;
         setImage(new ExpanderImageWidget(scenetrue, 8, 30));
         setSelectedImage(new ExpanderImageWidget(scenefalse, 8, 30));
         setRoundedBorder(0, 4, 4, null);
         setAction(new AbstractAction() {
             public void actionPerformed(ActionEvent arg0) {

Retrieve the former expanded state of the given expandable. If the expandable state was not cached (or the cache has been cleaned by the garbage collector), this method returns the value of the def parameter.

expandable the ExpandableWidget to query.
def default value for the expanded state.
true if expanded, false if collapsed.
    public static boolean isExpanded(ExpandableWidget expandableboolean def) {
        Boolean val = .get(expandable.hashKey());
        return val != null ? val.booleanValue() : def;

Set the expanded state of the widget.

expanded true to expand, false to collapse.
    public void setSelected(boolean expanded) {
        // Save the state of the expandable in case it gets recreated later.
        .put(.hashKey(), Boolean.valueOf(expanded));
    private static class ExpanderImageWidget extends ImageLabelWidget.PaintableImageWidget {
        private static final Stroke STROKE = new BasicStroke(2.5F, ..);
        private double cos;
        public ExpanderImageWidget(Scene sceneboolean upint sizeint degrees) {
            double radians = . * degrees / 180.0;
             = Math.cos(radians / 2.0);
            if (!up) {
                 = -;
        protected Stroke getImageStroke() {
            return ;
        protected Shape createImage(int widthint height) {
            GeneralPath path = new GeneralPath();
            float y1 = (float) (height+*height/2) / 2;
            float y2 = (float) (height-*height/2) / 2;
            path.moveTo(width / 2f, y1);
            path.lineTo(0, y2);
            path.moveTo(width / 2f, y1);
            return path;
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