LoadingScreen.java :  » GWT » gwtuml » com » objetdirect » gwt » umldrawer » client » Java Open Source

/*
 * This file is part of the GWTUML project and was written by Mounier Florian <mounier-dot-florian.at.gmail'dot'com> for Objet Direct
 * <http://wwww.objetdirect.com>
 * 
 * Copyright  2009 Objet Direct Contact: gwtuml@googlegroups.com
 * 
 * GWTUML is free software: you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software
 * Foundation, either version 3 of the License, or (at your option) any later version.
 * 
 * GWTUML 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 Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public License along with GWTUML. If not, see <http://www.gnu.org/licenses/>.
 */
package com.objetdirect.gwt.umldrawer.client;

import com.google.gwt.user.client.ui.HasHorizontalAlignment;
import com.google.gwt.user.client.ui.HasVerticalAlignment;
import com.google.gwt.user.client.ui.HorizontalPanel;
import com.google.gwt.user.client.ui.Image;
import com.google.gwt.user.client.ui.RootPanel;

/**
 * This class display an AJAX style loading screen to animate waiting time
 * 
 * @author Florian Mounier (mounier-dot-florian.at.gmail'dot'com)
 * 
 */
public class LoadingScreen {
  private final HorizontalPanel  loadingPanel;

  /**
   * Constructor of the {@link LoadingScreen}
   * 
   */
  public LoadingScreen() {
    super();
    final Image loader = new Image("ajax-loader.gif");
    this.loadingPanel = new HorizontalPanel();
    this.loadingPanel.setHorizontalAlignment(HasHorizontalAlignment.ALIGN_CENTER);
    this.loadingPanel.setVerticalAlignment(HasVerticalAlignment.ALIGN_MIDDLE);
    this.loadingPanel.setSize("100%", "100%");
    this.loadingPanel.add(loader);
    this.loadingPanel.setVisible(false);
    RootPanel.get().add(this.loadingPanel, 0, 0);
  }

  /**
   * Hide the loading screen
   */
  public void hide() {
    this.loadingPanel.setVisible(false);
  }

  /**
   * Show the loading screen
   */
  public void show() {
    this.loadingPanel.setVisible(true);
  }
}