TransparencyUtil.java

/**
 * 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.impl;

import com.google.gwt.dom.client.Element;
import org.waveprotocol.wave.client.common.util.DomHelper;
import org.waveprotocol.wave.model.document.util.FilteredView.Skip;

import java.util.List;

/**
 * Utility methods
 * @author danilatos@google.com (Daniel Danilatos)
 */
public class TransparencyUtil {

  /**
   * Helper to remove a list of transparent nodes from the document
   * @param elements
   */
  public static void clear(List<Element> elements) {
    for (Element e : elements) {
      if (e.getParentElement() != null) {
        if (NodeManager.getTransparency(e) == Skip.DEEP) {
          e.removeFromParent();
        } else {
          DomHelper.unwrap(e);
        }
      }
      // Break circular references in browsers with poor gc
      NodeManager.setTransparentBackref(e, null);
    }

    elements.clear();
  }
}