ParserSample.java

/**********************************************
 * 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");
		}
	}
}