org.vaadin.gwtgraphics.client.impl.util.VMLUtil.java Source code

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Here is the source code for org.vaadin.gwtgraphics.client.impl.util.VMLUtil.java

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/*
 * Copyright 2011 Henri Kerola
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.vaadin.gwtgraphics.client.impl.util;

import com.google.gwt.dom.client.Document;
import com.google.gwt.dom.client.Element;
import com.google.gwt.dom.client.Node;
import com.google.gwt.dom.client.NodeList;

/**
 * This class contains helpers used by the VMLImpl class.
 * 
 * @author Henri Kerola
 * 
 */
public abstract class VMLUtil {

    public static final String VML_NS_PREFIX = "vml";

    public static final String VML_ELEMENT_CLASSNAME = "vml-element";

    public static Element createVMLElement(String name) {
        Element element = Document.get().createElement(VML_NS_PREFIX + ":" + name);
        element.setClassName(VML_ELEMENT_CLASSNAME);
        return element;
    }

    public static Element getOrCreateChildElementWithTagName(Element element, String name) {
        Element e = getChildElementWithTagName(element, name);
        if (e != null) {
            return e;
        }
        return element.appendChild(createVMLElement(name));
    }

    public static String getPropertyOfFirstChildElementWithTagName(Element element, String name, String attr) {
        Element e = getChildElementWithTagName(element, name);
        if (e != null) {
            return e.getPropertyString(attr);
        }
        return "";
    }

    public static boolean hasChildElementWithTagName(Element element, String name) {
        Element e = getChildElementWithTagName(element, name);
        return e != null;
    }

    private static Element getChildElementWithTagName(Element element, String name) {
        NodeList<Node> nodes = element.getChildNodes();
        for (int i = 0; i < nodes.getLength(); i++) {
            Node node = nodes.getItem(i);
            if (node.getNodeName().equals(name)) {
                return Element.as(node);
            }
        }
        return null;
    }

    public native static String getTagName(Element element) /*-{
                                                            return element.tagName;
                                                            }-*/;
}