content: /*
   * Copyright (C) 2015 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 androidx.leanback.leanbackshowcase.cards.presenters;
  
  import android.content.Context;
  import androidx.leanback.leanbackshowcase.models.Card;
  import androidx.leanback.widget.BaseCardView;
  import androidx.leanback.widget.Presenter;
  import android.view.ViewGroup;
  
  /**
   * This abstract, generic class will create and manage the
   * ViewHolder and will provide typed Presenter callbacks such that you do not have to perform casts
   * on your own.
   *
   * @param <T> View type for the card.
   */
  public abstract class AbstractCardPresenter<T extends BaseCardView> extends Presenter {
  
      private static final String TAG = "AbstractCardPresenter";
      private final Context mContext;
  
      /**
       * @param context The current context.
       */
      public AbstractCardPresenter(Context context) {
          mContext = context;
      }
  
      public Context getContext() {
          return mContext;
      }
  
      @Override public final ViewHolder onCreateViewHolder(ViewGroup parent) {
          T cardView = onCreateView();
          return new ViewHolder(cardView);
      }
  
      @Override public final void onBindViewHolder(ViewHolder viewHolder, Object item) {
          Card card = (Card) item;
          onBindViewHolder(card, (T) viewHolder.view);
      }
  
      @Override public final void onUnbindViewHolder(ViewHolder viewHolder) {
          onUnbindViewHolder((T) viewHolder.view);
      }
  
      public void onUnbindViewHolder(T cardView) {
          // Nothing to clean up. Override if necessary.
      }
  
      /**
       * Invoked when a new view is created.
       *
       * @return Returns the newly created view.
       */
      protected abstract T onCreateView();
  
      /**
       * Implement this method to update your card's view with the data bound to it.
       *
       * @param card The model containing the data for the card.
       * @param cardView The view the card is bound to.
       * @see Presenter#onBindViewHolder(Presenter.ViewHolder, Object)
       */
      public abstract void onBindViewHolder(Card card, T cardView);
  
  }
  