GWT-test-utils helper to patch GWT Canvas

GWTCanvasIeFix.java

package com.google.gwt.widgetideas.graphics.client;

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

/**
 * IE fix for GWT canvas. Since
 *
 * Created by IntelliJ IDEA.
 * User: Jesper Rønn-Jensen
 * Date: 10-11-11
 * Time: 14:05
 * To change this template use File | Settings | File Templates.
 */
public class GWTCanvasIeFix extends GWTCanvas {

    public GWTCanvasIeFix(int width, int height) {
        super(width, height);
    }

    @Override
    protected void onAttach() {
        super.onAttach();
        fixIt();

    }

    public void fixIt() {
        fix(this.getElement());
    }

    public static native void fix(Element el) /*-{
        var ua = navigator.userAgent.toLowerCase();
        if (ua.indexOf("msie") != -1 && $doc.documentMode && $doc.documentMode >= 8) {

            if (!$doc.namespaces["v"]) {
                $doc.namespaces.add("v", "urn:schemas-microsoft-com:vml", "#default#VML");
            }
            var col = el.getElementsByTagName('shape');
            for (var i = 0; i < col.length; i++) {
                col[i].outerHTML = col[i].outerHTML;
                col[i].style.width = '10px';
                col[i].style.height = '10px';
            }
        }
    }-*/;
}

GWTCanvasIeFixPatcher.java

package com.nordea.testing;

import com.google.gwt.user.client.Element;
import com.google.gwt.widgetideas.graphics.client.GWTCanvasIeFix;
import com.octo.gwt.test.patchers.PatchClass;
import com.octo.gwt.test.patchers.PatchMethod;

/**
 * gwt-test-utils to patch the GWT CAnvas createElement() method
 *
 *
 * Our real-life code has a modification in GWTCanvas class, which is here overridden
 *
 *
 *
 * Created by IntelliJ IDEA.
 * User: Jesper Rønn-Jensen
 * Date: 10-11-11
 * Time: 13:13
 */
@PatchClass(GWTCanvasIeFix.class)
public class GWTCanvasIeFixPatcher {

    @PatchMethod
    public static void fix(Element el) {
        //nothing
    }
}

PiechartGWTCreateHandler.java

package com.company.testing;

import com.google.gwt.dom.client.Element;
import com.google.gwt.widgetideas.graphics.client.GradientFactory;
import com.google.gwt.widgetideas.graphics.client.impl.GWTCanvasImpl;
import com.octo.gwt.test.GwtCreateHandler;
import com.octo.gwt.test.internal.patchers.dom.JavaScriptObjects;

import static org.mockito.Mockito.doReturn;
import static org.mockito.Mockito.mock;

/**
 * GWT-test-utils patcher to stub the parts of GWTCanvas which we use for piecharts in 
 * a real-life project.
 * 
 * This implementations creates Mockito mocks for 
 *     GradientFactory
 *     GWTCanvasImpl
 * 
 * User: Jesper Rønn-Jensen
 * Date: 10-11-11
 * Time: 13:52
 *
 */
public class PiechartGWTCreateHandler implements GwtCreateHandler {
    /**
     * <p>
     * Instantiates an object of the given class.
     * </p>
     * <p/>
     * <p>
     * This handler may be able to instantiate objects of certain types only. If
     * the class passed as parameter is not handled, the method should return
     * null.
     * </p>
     *
     * @param clazz the class to instantiate
     * @return an object of this class if this GwtCreateHandler is capable of
     *         handling it, null otherwise
     * @throws Exception if an error occurred when trying to create the object
     */
    @Override
    public Object create(Class<?> clazz) throws Exception {
        if (GradientFactory.class.equals(clazz)) {
            return mock(GradientFactory.class);
        } else if (GWTCanvasImpl.class.equals(clazz)) {
            GWTCanvasImpl canvasMock = mock(GWTCanvasImpl.class);
            Element xxx = JavaScriptObjects.newElement("canvas");
            doReturn(xxx).when(canvasMock).createElement();
            return canvasMock;
        }
        return null;
    }
}