xref: /frameworks/support/v17/leanback/src/android/support/v17/leanback/widget/OnChildViewHolderSelectedListener.java

/*
 * Copyright (C) 2014 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.widget;

import android.support.v17.leanback.widget.ItemAlignmentFacet.ItemAlignmentDef;
import android.support.v7.widget.RecyclerView;
import android.view.View;
import android.view.ViewGroup;

/**
 * Interface for receiving notification when a child of this
 * ViewGroup has been selected.
 */
public abstract class OnChildViewHolderSelectedListener {
    /**
     * Callback method to be invoked when a child of this ViewGroup has been
     * selected.
     *
     * @param parent The RecyclerView where the selection happened.
     * @param child The ViewHolder within the RecyclerView that is selected, or null if no
     *        view is selected.
     * @param position The position of the view in the adapter, or NO_POSITION
     *        if no view is selected.
     * @param subposition The index of which {@link ItemAlignmentDef} being used,
     *                    0 if there is no ItemAlignmentDef defined for the item.
     */
    public void onChildViewHolderSelected(RecyclerView parent, RecyclerView.ViewHolder child,
            int position, int subposition) {
    }
}