1/*
2 * Copyright (C) 2014 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package com.android.tv.settings.widget;
18
19import android.view.View;
20import android.view.ViewGroup;
21import android.widget.Adapter;
22import android.widget.ListAdapter;
23
24/**
25 * The adapter for ScrollAdapterView added more features controlling life cycle.
26 */
27public interface ScrollAdapterBase extends ListAdapter {
28
29    /**
30     * optional method to be implemented by {@link Adapter}. {@link #viewRemoved(View)} is called
31     * when a view is removed from ScrollAdapterView, this gives Adapter a chance to do some clean
32     * up work: for example release resources, cancel image downloading task. The implementation
33     * should not destroy the view hierarchy because the view might be recycled and passed as
34     * parameter in next {@link Adapter#getView(int, View, ViewGroup)}.
35     */
36    public abstract void viewRemoved(View view);
37
38    /**
39     * Creates a scrap view to measure and decide the size of ScrollAdapterView , the difference
40     * from {@link #getView(int, View, ViewGroup)} is that it shouldn't load any runtime data for
41     * efficiency.
42     */
43    public abstract View getScrapView(ViewGroup parent);
44
45}
46