/**********************************************
    * Copyright (C) 2009 Lukas Laag
    * This file is part of lib-gwt-svg-samples.
    * 
    * libgwtsvg-samples is free software: you can redistribute it and/or modify
    * it under the terms of the GNU General Public License as published by
    * the Free Software Foundation, either version 3 of the License, or
    * (at your option) any later version.
    * 
   * libgwtsvg-samples 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 General Public License for more details.
   * 
   * You should have received a copy of the GNU General Public License
   * along with libgwtsvg-samples.  If not, see http://www.gnu.org/licenses/
   **********************************************/
  package org.vectomatic.svg.samples.client.parser;
  
  import org.vectomatic.dom.svg.OMSVGSVGElement;
  import org.vectomatic.dom.svg.ui.ExternalSVGResource;
  import org.vectomatic.dom.svg.ui.ExternalSVGResource.Validated;
  import org.vectomatic.dom.svg.ui.SVGResource;
  import org.vectomatic.dom.svg.utils.ParserException;
  import org.vectomatic.svg.samples.client.Main;
  import org.vectomatic.svg.samples.client.Main.MainBundle;
  import org.vectomatic.svg.samples.client.SampleBase;
  
  import com.google.gwt.core.client.GWT;
  import com.google.gwt.event.dom.client.ChangeEvent;
  import com.google.gwt.resources.client.ClientBundle;
  import com.google.gwt.resources.client.ResourceCallback;
  import com.google.gwt.resources.client.ResourceException;
  import com.google.gwt.uibinder.client.UiBinder;
  import com.google.gwt.uibinder.client.UiField;
  import com.google.gwt.uibinder.client.UiHandler;
  import com.google.gwt.user.client.Element;
  import com.google.gwt.user.client.Window;
  import com.google.gwt.user.client.ui.HTML;
  import com.google.gwt.user.client.ui.ListBox;
  import com.google.gwt.user.client.ui.TabLayoutPanel;
  
  /**
   * Class to demonstrate the parsing of SVG files
   * @author laaglu
   */
  public class ParserSample extends SampleBase {
  	interface ParserSampleBinder extends UiBinder<TabLayoutPanel, ParserSample> {
  	}
  	private static ParserSampleBinder binder = GWT.create(ParserSampleBinder.class);
  
  	public interface ParserSampleBundle extends ClientBundle {
  		public static ParserSampleBundle INSTANCE = GWT.create(ParserSampleBundle.class);
  		
  		@Source("tiger.svg")
  		ExternalSVGResource tiger();
  		@Source("lion.svg")
  		ExternalSVGResource lion();
  		@Source("butterfly.svg")
  		ExternalSVGResource butterfly();
  		@Source("notwellformed.svg")
  		@Validated(validated = false)
  		ExternalSVGResource notwellformed();
  	}
  
  	@UiField(provided=true)
  	public static MainBundle mainBundle = Main.mainBundle;
  	@UiField
  	HTML svgContainer;
  	@UiField
  	ListBox documentListBox;
  	OMSVGSVGElement svg;
  	private int lastSelectedIndex;
  
  	ResourceCallback<SVGResource> callback = new ResourceCallback<SVGResource>() {
  
  		@Override
  		public void onError(ResourceException e) {
  			sourceHtml.setHTML("Cannot find resource");
  		}
  
  		@Override
  		public void onSuccess(SVGResource resource) {
  			// Insert the SVG root element into the HTML UI
  			Element div = svgContainer.getElement();
  			svg = resource.getSvg();
  			if (div.hasChildNodes()) {
  				div.replaceChild(svg.getElement(), div.getFirstChild());
  			} else {
  				div.appendChild(svg.getElement());					
  			}
  		}
  		
  	};
  	
  	@Override
  	public TabLayoutPanel getPanel() {
  		if (tabPanel == null) {
  			// Initialize the UI with UiBinder
 			tabPanel = binder.createAndBindUi(this);
 			tabPanel.setTabText(0, "Parser");
 			createCodeTabs("ParserSample");
 
 			// Fill the list box with svg file names
 			documentListBox.addItem("tiger");
 			documentListBox.addItem("lion");
 			documentListBox.addItem("butterfly");
 			documentListBox.addItem("not well formed");
 			documentListBox.setSelectedIndex(0);
 			documentListBoxChange(null);
 		}
 		return tabPanel;
 	}
 	
 	@UiHandler("documentListBox")
 	public void documentListBoxChange(ChangeEvent event) {
 		// Request the contents of the file
 		try {
 			switch(documentListBox.getSelectedIndex()) {
 				case 0:
 					ParserSampleBundle.INSTANCE.tiger().getSvg(callback);
 					break;
 				case 1:
 					ParserSampleBundle.INSTANCE.lion().getSvg(callback);
 					break;
 				case 2:
 					ParserSampleBundle.INSTANCE.butterfly().getSvg(callback);
 					break;
 				case 3:
 					try {
 						ParserSampleBundle.INSTANCE.notwellformed().getSvg(callback);
 					} catch(ParserException e) {
 						Window.alert("Parsing error: " + e.getMessage());
 						documentListBox.setSelectedIndex(lastSelectedIndex);
 					}
 					break;
 			}
 			lastSelectedIndex = documentListBox.getSelectedIndex();
 		} catch(ResourceException e) {
 			sourceHtml.setHTML("Cannot find resource");
 		}
 	}
 }