content: /*
   * Copyright (C) 2017 The Android Open Source Project
   *
   * 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 com.android.internal.widget.helper;
  
  import android.graphics.Canvas;
  import android.view.View;
  
  import com.android.internal.widget.RecyclerView;
  
  /**
   * Utility class for {@link ItemTouchHelper} which handles item transformations for different
   * API versions.
   * <p/>
   * This class has methods that map to {@link ItemTouchHelper.Callback}'s drawing methods. Default
   * implementations in {@link ItemTouchHelper.Callback} call these methods with
   * {@link RecyclerView.ViewHolder#itemView} and {@link ItemTouchUIUtil} makes necessary changes
   * on the View depending on the API level. You can access the instance of {@link ItemTouchUIUtil}
   * via {@link ItemTouchHelper.Callback#getDefaultUIUtil()} and call its methods with the children
   * of ViewHolder that you want to apply default effects.
   *
   * @see ItemTouchHelper.Callback#getDefaultUIUtil()
   */
  public interface ItemTouchUIUtil {
  
      /**
       * The default implementation for {@link ItemTouchHelper.Callback#onChildDraw(Canvas,
       * RecyclerView, RecyclerView.ViewHolder, float, float, int, boolean)}
       */
      void onDraw(Canvas c, RecyclerView recyclerView, View view,
              float dX, float dY, int actionState, boolean isCurrentlyActive);
  
      /**
       * The default implementation for {@link ItemTouchHelper.Callback#onChildDrawOver(Canvas,
       * RecyclerView, RecyclerView.ViewHolder, float, float, int, boolean)}
       */
      void onDrawOver(Canvas c, RecyclerView recyclerView, View view,
              float dX, float dY, int actionState, boolean isCurrentlyActive);
  
      /**
       * The default implementation for {@link ItemTouchHelper.Callback#clearView(RecyclerView,
       * RecyclerView.ViewHolder)}
       */
      void clearView(View view);
  
      /**
       * The default implementation for {@link ItemTouchHelper.Callback#onSelectedChanged(
       * RecyclerView.ViewHolder, int)}
       */
      void onSelected(View view);
  }
  
  