content: /*
   * android-spinnerwheel
   * https://github.com/ai212983/android-spinnerwheel
   *
   * based on
   *
   * Android Wheel Control.
   * https://code.google.com/p/android-wheel/
   *
   * Copyright 2011 Yuri Kanivets
   *
   * 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 antistatic.spinnerwheel.adapters;
  
  import android.database.DataSetObserver;
  import android.view.View;
  import android.view.ViewGroup;
  
  /**
   * Wheel items adapter interface
   */
  public interface WheelViewAdapter {
      /**
       * Gets items count
       * @return the count of spinnerwheel items
       */
      public int getItemsCount();
  
      /**
       * Get a View that displays the data at the specified position in the data set
       *
       * @param index the item index
       * @param convertView the old view to reuse if possible
       * @param parent the parent that this view will eventually be attached to
       * @param currentItemIdx
       * @return the spinnerwheel item View
       */
      public View getItem(int index, View convertView, ViewGroup parent, int currentItemIdx);
  
      /**
       * Get a View that displays an empty spinnerwheel item placed before the first or after
       * the last spinnerwheel item.
       *
       * @param convertView the old view to reuse if possible
       * @param parent the parent that this view will eventually be attached to
       * @return the empty item View
       */
      public View getEmptyItem(View convertView, ViewGroup parent);
  
      /**
       * Register an observer that is called when changes happen to the data used by this adapter.
       * @param observer the observer to be registered
       */
      public void registerDataSetObserver(DataSetObserver observer);
  
      /**
       * Unregister an observer that has previously been registered
       * @param observer the observer to be unregistered
       */
      void unregisterDataSetObserver (DataSetObserver observer);
  }
  