content: /*
   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements.  See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership.  The ASF licenses this file
   * to you 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.apache.weex.ui.component.helper;
  
  import org.apache.weex.ui.component.Scrollable;
  import org.apache.weex.ui.component.WXComponent;
  
  import java.util.Map;
  import java.util.concurrent.ConcurrentHashMap;
  
  /**
   * Created by miomin on 16/7/7.
   */
  public class WXStickyHelper {
  
      private Scrollable scrollable;
  
      public WXStickyHelper(Scrollable scrollable) {
          this.scrollable = scrollable;
      }
  
      public void bindStickStyle(WXComponent component, Map<String, Map<String, WXComponent>> mStickyMap) {
          Scrollable scroller = component.getParentScroller();
          if (scroller == null) {
              return;
          }
          Map<String, WXComponent> stickyMap = mStickyMap.get(scroller
                  .getRef());
          if (stickyMap == null) {
              stickyMap = new ConcurrentHashMap<>();
          }
          if (stickyMap.containsKey(component.getRef())) {
              return;
          }
          stickyMap.put(component.getRef(), component);
          mStickyMap.put(scroller.getRef(), stickyMap);
      }
  
      public void unbindStickStyle(WXComponent component, Map<String, Map<String, WXComponent>> mStickyMap) {
          Scrollable scroller = component.getParentScroller();
          if (scroller == null) {
              return;
          }
          Map<String, WXComponent> stickyMap = mStickyMap.get(scroller
                  .getRef());
          if (stickyMap == null) {
              return;
          }
          stickyMap.remove(component.getRef());
      }
  }
  