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/*
* 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 android.support.v17.leanback.supportleanbackshowcase.cards.presenters;
import android.content.Context;
import android.support.v17.leanback.supportleanbackshowcase.models.Card;
import android.support.v17.leanback.widget.BaseCardView;
import android.support.v17.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 <CardViewType> The cards' View Type.
*/
public abstract class AbstractCardPresenter<CardViewType 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) {
CardViewType cardView = onCreateView();
return new ViewHolder(cardView);
}
@Override public final void onBindViewHolder(ViewHolder viewHolder, Object item) {
Card card = (Card) item;
onBindViewHolder(card, (CardViewType) viewHolder.view);
}
@Override public final void onUnbindViewHolder(ViewHolder viewHolder) {
onUnbindViewHolder((CardViewType) viewHolder.view);
}
public void onUnbindViewHolder(CardViewType cardView) {
// Nothing to clean up. Override if necessary.
}
/**
* Invoked when a new view is created.
*
* @return Returns the newly created view.
*/
protected abstract CardViewType 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, CardViewType cardView);
}
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