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/*
* Copyright (C) 2021 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.launcher3.recyclerview;
import android.view.ViewGroup;
import androidx.annotation.IntDef;
import androidx.recyclerview.widget.RecyclerView.ViewHolder;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.util.List;
/**
* Creates and populates views with data
*
* @param <T> A data model which is used to populate the {@link ViewHolder}.
* @param <V> A subclass of {@link ViewHolder} which holds references to views.
*/
public interface ViewHolderBinder<T, V extends ViewHolder> {
int POSITION_DEFAULT = 0;
int POSITION_FIRST = 1 << 0;
int POSITION_LAST = 1 << 1;
@Retention(RetentionPolicy.SOURCE)
@IntDef(value = {POSITION_DEFAULT, POSITION_FIRST, POSITION_LAST}, flag = true)
@interface ListPosition {}
/**
* Creates a new view, and attach it to the parent {@link ViewGroup}. Then, populates UI
* references in a {@link ViewHolder}.
*/
V newViewHolder(ViewGroup parent);
/** Populate UI references in {@link ViewHolder} with data. */
void bindViewHolder(V viewHolder, T data, @ListPosition int position, List<Object> payloads);
/**
* Called when the view is recycled. Views are recycled in batches once they are sufficiently
* far off screen that it is unlikely the user will scroll back to them soon. Optionally
* override this to free expensive resources.
*/
default void unbindViewHolder(V viewHolder) {}
}
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