001    /*
002     * Sonar, open source software quality management tool.
003     * Copyright (C) 2008-2012 SonarSource
004     * mailto:contact AT sonarsource DOT com
005     *
006     * Sonar is free software; you can redistribute it and/or
007     * modify it under the terms of the GNU Lesser General Public
008     * License as published by the Free Software Foundation; either
009     * version 3 of the License, or (at your option) any later version.
010     *
011     * Sonar is distributed in the hope that it will be useful,
012     * but WITHOUT ANY WARRANTY; without even the implied warranty of
013     * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
014     * Lesser General Public License for more details.
015     *
016     * You should have received a copy of the GNU Lesser General Public
017     * License along with Sonar; if not, write to the Free Software
018     * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02
019     */
020    package org.sonar.gwt.ui;
021    
022    import com.google.gwt.user.client.ui.ClickListener;
023    import com.google.gwt.user.client.ui.Hyperlink;
024    import com.google.gwt.user.client.ui.Widget;
025    
026    public class ExpandCollapseLink extends Hyperlink {
027    
028      private Widget expandOrCollapse;
029    
030      public ExpandCollapseLink(Widget expandOrCollapse) {
031        super();
032        this.expandOrCollapse = expandOrCollapse;
033        setText(getLinkLabel(!expandOrCollapse.isVisible()));
034        getElement().setId("expand-" + expandOrCollapse.getElement().getId());
035        setStyleName("expandCollapseLink");
036        final ExpandCollapseLink link = this;
037        this.addClickListener(new ClickListener() {
038          public void onClick(Widget sender) {
039            link.toggle();
040          }
041        });
042        getElement().getFirstChildElement().setAttribute("href", "#");
043      }
044    
045      public void toggle() {
046        boolean visible = expandOrCollapse.isVisible();
047        setText(getLinkLabel(visible));
048        expandOrCollapse.setVisible(!visible);
049      }
050    
051      protected String getLinkLabel(boolean show) {
052        return (show ? "expand" : "collapse");
053      }
054    
055    }