/**
 * Copyright 2009 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.editor.content.misc;

import com.google.gwt.dom.client.Document;
import com.google.gwt.dom.client.Element;
import org.waveprotocol.wave.client.common.util.DomHelper;
import org.waveprotocol.wave.client.editor.NodeEventHandler;
import org.waveprotocol.wave.client.editor.NodeEventHandlerImpl;
import org.waveprotocol.wave.client.editor.content.ContentElement;
import org.waveprotocol.wave.client.editor.content.Renderer;
import org.waveprotocol.wave.client.editor.event.EditorEvent;

/**
 * Renderer for the place holder for the blobs of UI added at annotation
 * boundaries
 *
 * @author danilatos@google.com (Daniel Danilatos)
 */
class AnnotationBoundaryRenderer implements Renderer {

  /** Event handler */
  public static final NodeEventHandler EVENT_HANDLER = new NodeEventHandlerImpl() {
    @Override
    public boolean handleBackspaceAfterNode(ContentElement element, EditorEvent event) {
      return handleBackspaceAtBeginning(element, event);
    }

    @Override
    public boolean handleDeleteBeforeNode(ContentElement element, EditorEvent event) {
      return handleDeleteAtEnd(element, event);
    }
  };

  @Override
  public Element createDomImpl(Renderable element) {
    Element nodelet = Document.get().createSpanElement();

    DomHelper.makeUnselectable(nodelet);
    DomHelper.setContentEditable(nodelet, false, false);

    element.setAutoAppendContainer(nodelet);
    return nodelet;
  }
}