RootPanelPatcher.java

package com.googlecode.gwt.test.internal.patchers;

import com.google.gwt.dom.client.BodyElement;
import com.google.gwt.dom.client.Document;
import com.google.gwt.dom.client.Element;
import com.google.gwt.user.client.Event;
import com.google.gwt.user.client.ui.RootPanel;
import com.googlecode.gwt.test.patchers.PatchClass;
import com.googlecode.gwt.test.patchers.PatchMethod;

@PatchClass(RootPanel.class)
class RootPanelPatcher {

    @PatchMethod
    static com.google.gwt.user.client.Element getBodyElement() {
        return Document.get().getBody().cast();
    }

    @PatchMethod
    static boolean isElementChildOfWidget(Element element) {
        // Walk up the DOM hierarchy, looking for any widget with an event
        // listener
        // set. Though it is not dependable in the general case that a widget will
        // have set its element's event listener at all times, it *is* dependable
        // if the widget is attached. Which it will be in this case.
        element = element.getParentElement();
        BodyElement body = Document.get().getBody();
        while (element != null && body != element) {
            if (Event.getEventListener(element) != null) {
                return true;
            }
            element = element.getParentElement();
        }
        return false;
    }

}