001    /*
002     * Sonar, open source software quality management tool.
003     * Copyright (C) 2009 SonarSource SA
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.api.web.gwt.client;
021    
022    import com.google.gwt.core.client.EntryPoint;
023    import com.google.gwt.user.client.DOM;
024    import com.google.gwt.user.client.Element;
025    import com.google.gwt.user.client.ui.RootPanel;
026    import com.google.gwt.user.client.ui.Widget;
027    
028    public abstract class AbstractPage implements EntryPoint {
029      private RootPanel rootPanel;
030    
031      public AbstractPage() {
032        rootPanel = null;
033      }
034    
035      protected void displayView(Widget widget) {
036        Element loading = DOM.getElementById("loading");
037        if (loading != null) {
038          DOM.removeChild(getRootPanel().getElement(), loading);
039        }
040        getRootPanel().add(widget);
041      }
042    
043      protected RootPanel getRootPanel() {
044        if (rootPanel == null) {
045          rootPanel = RootPanel.get("gwtpage");
046        }
047        return rootPanel;
048      }
049    }