FocusRecyclerView.java

/*
 * Copyright 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 com.android.settings.dashboard.conditional;

import android.content.Context;
import android.support.annotation.Nullable;
import android.support.v7.widget.RecyclerView;
import android.util.AttributeSet;

/**
 * Version of RecyclerView that can have listeners for onWindowFocusChanged.
 */
public class FocusRecyclerView extends RecyclerView {

    private FocusListener mListener;

    public FocusRecyclerView(Context context, @Nullable AttributeSet attrs) {
        super(context, attrs);
    }

    @Override
    public void onWindowFocusChanged(boolean hasWindowFocus) {
        super.onWindowFocusChanged(hasWindowFocus);
        if (mListener != null) {
            mListener.onWindowFocusChanged(hasWindowFocus);
        }
    }

    public void setListener(FocusListener listener) {
        mListener = listener;
    }

    public interface FocusListener {
        void onWindowFocusChanged(boolean hasWindowFocus);
    }
}