/**
* Copyright 2010 Google Inc.
*
* 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.waveprotocol.wave.client.doodad.form.check;
import com.google.gwt.core.client.GWT;
import com.google.gwt.dom.client.Document;
import com.google.gwt.dom.client.Element;
import com.google.gwt.dom.client.LabelElement;
import com.google.gwt.dom.client.StyleInjector;
import com.google.gwt.resources.client.ClientBundle;
import com.google.gwt.resources.client.CssResource;
import org.waveprotocol.wave.client.editor.RenderingMutationHandler;
import org.waveprotocol.wave.client.editor.content.ContentElement;
/**
* Rendering mutation handler for labels.
*
*/
public final class LabelRenderingMutationHandler extends RenderingMutationHandler {
public interface Resources extends ClientBundle {
@Source("Label.css")
Css css();
}
public interface Css extends CssResource {
String label();
}
/** The singleton instance of our CSS resources. */
private static final Css css = GWT.<Resources>create(Resources.class).css();
static {
// For unit testing using mockito all Gwt.Create() returns mocks.
// The mock for Resources.class returns null css by default.
if (css != null) {
StyleInjector.inject(css.getText(), true);
}
}
private static RenderingMutationHandler instance;
/**
*/
public static RenderingMutationHandler getInstance() {
if (instance == null) {
instance = new LabelRenderingMutationHandler();
}
return instance;
}
@Override
public Element createDomImpl(Renderable element) {
Element label = Document.get().createLabelElement();
label.setClassName(css.label());
return element.setAutoAppendContainer(label);
}
@Override
public void onActivationStart(ContentElement element) {
fanoutAttrs(element);
}
@Override
public void onAttributeModified(ContentElement element, String name, String oldValue,
String newValue) {
if (Label.FOR.equals(name)) {
getImpl(element).setHtmlFor(element.getEditorUniqueString() + newValue);
}
}
/**
* @return impl nodelet as {@link LabelElement}
*/
private LabelElement getImpl(ContentElement element) {
return LabelElement.as(element.getImplNodelet());
}
}