org.geomajas.gwt2.client.gfx.VectorTileObject.java Source code

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Here is the source code for org.geomajas.gwt2.client.gfx.VectorTileObject.java

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/*
 * This is part of Geomajas, a GIS framework, http://www.geomajas.org/.
 *
 * Copyright 2008-2014 Geosparc nv, http://www.geosparc.com/, Belgium.
 *
 * The program is available in open source according to the GNU Affero
 * General Public License. All contributions in this program are covered
 * by the Geomajas Contributors License Agreement. For full licensing
 * details, see LICENSE.txt in the project root.
 */

package org.geomajas.gwt2.client.gfx;

import org.geomajas.gwt.client.util.Dom;
import org.vaadin.gwtgraphics.client.Group;
import org.vaadin.gwtgraphics.client.VectorObject;

import com.google.gwt.dom.client.Document;
import com.google.gwt.user.client.Element;

/**
 * Vector object that represents a tile for a vector layer. As this class is an extension of the {@link VectorObject}
 * super class, it can be add to a VectorObjectContainer for rendering. The <code>setContent</code> method will provide
 * the actual content for this tile in the form of an SVG or VML string.
 * 
 * @author Pieter De Graef
 */
public class VectorTileObject extends VectorObject {

    /**
     * Set the actual tile contents. This string will probably come from the server which has the capability to create
     * SVG/VML string representing a tile.
     * 
     * @param content
     *            The actual SVG or VML string to be parsed and applied in this tile. It contains the actual rendering.
     */
    public void setContent(String content) {
        if (Dom.isIE()) {
            throw new IllegalArgumentException("VectorTileGroup - rendering VML tiles: Not implemented.");
        } else {
            setInnerSvg(getElement(), content);
        }
    }

    protected Class<? extends VectorObject> getType() {
        return Group.class;
    }

    /**
     * Similar method to the "setInnerHTML", but specified for setting SVG. Using the regular setInnerHTML, it is not
     * possible to set a string of SVG on an object. This method can do that. On the other hand, this method is better
     * not used for setting normal HTML as an element's innerHTML.
     * 
     * @param element
     *            The element onto which to set the SVG string.
     * @param svg
     *            The string of SVG to set on the element.
     */
    public static void setInnerSvg(Element element, String svg) {
        if (Dom.isFireFox()) {
            setFireFoxInnerHTML(element,
                    "<g xmlns=\"http://www.w3.org/2000/svg\" xmlns:xlink=\"http://www.w3.org/1999/xlink\">" + svg
                            + "</g>");
        } else if (Dom.isWebkit()) {
            setWebkitInnerHTML(element,
                    "<g xmlns=\"http://www.w3.org/2000/svg\" xmlns:xlink=\"http://www.w3.org/1999/xlink\">" + svg
                            + "</g>");
        }
    }

    private static native void setFireFoxInnerHTML(Element element, String svg)
    /*-{
        var fragment = new DOMParser().parseFromString(svg, "text/xml");
        if(fragment) {
      var children = fragment.childNodes;         
      for(var i=0; i < children.length; i++) {    
         element.appendChild (children[i]);
      }
        }
     }-*/;

    private static native void setWebkitInnerHTML(Element element, String svg)
    /*-{
        var fragment = new DOMParser().parseFromString(svg,"text/xml");   
        if(fragment) {
      var children = fragment.childNodes;         
      for(var i=0; i < children.length; i++) {
       var node = @org.geomajas.gwt.client.gfx.VectorTileObject::clone(Lcom/google/gwt/user/client/Element;)
               (children[i]);
         element.appendChild (node);
      }
        }
     }-*/;

    /**
     * Clone a single SVG element.
     * 
     * @param source
     *            The source SVG element.
     * @return Returns the clone.
     */
    private static Element clone(Element source) {
        if (source == null || source.getNodeName() == null) {
            return null;
        }
        if ("#text".equals(source.getNodeName())) {
            return Document.get().createTextNode(source.getNodeValue()).cast();
        }
        Element clone = createElementNS(Dom.NS_SVG, source.getNodeName());
        cloneAttributes(source, clone);
        for (int i = 0; i < source.getChildCount(); i++) {
            Element child = source.getChild(i).cast();
            clone.appendChild(clone(child));
        }

        return clone;
    }

    /**
     * <p>
     * Creates a new DOM element in the given name-space. If the name-space is HTML, a normal element will be created.
     * </p>
     * <p>
     * There is an exception when using Internet Explorer! For Internet Explorer a new element will be created of type
     * "namespace:tag".
     * </p>
     * 
     * @param ns
     *            The name-space to be used in the element creation.
     * @param tag
     *            The tag-name to be used in the element creation.
     * @return Returns a newly created DOM element in the given name-space.
     */
    public static Element createElementNS(String ns, String tag) {
        if (ns.equals(Dom.NS_HTML)) {
            return Dom.createElement(tag);
        } else {
            if (Dom.isIE()) {
                return Dom.createElement(ns + ":" + tag);
            } else {
                return createNameSpaceElement(ns, tag);
            }
        }
    }

    private static native Element createNameSpaceElement(String ns, String tag)
    /*-{
     return $doc.createElementNS(ns, tag);
    }-*/;

    private static native void cloneAttributes(Element source, Element target)
    /*-{
    if (source != null && target != null) {
       for (var i=0; i<source.attributes.length; i++) {
          var attribute = source.attributes.item(i);
          if (attribute.value != null && attribute.value.length > 0) {
             var atClone = null;
             try {
                atClone = $doc.createAttributeNS(attribute.namespaceURI, attribute.name);
             } catch (e) {
                atClone = $doc.createAttribute(attribute.name);
             }
            atClone.value = attribute.value;
            target.setAttributeNode(atClone);
          }
       }
    }
     }-*/;

    @Override
    protected void drawTransformed() {
        if (hasScale() || hasTranslation()) {
            throw new UnsupportedOperationException("can't transform VectorTileObject");
        }
    }
}