1/*
2 * Copyright (C) 2016 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 android.support.v4.widget;
18
19import android.view.View;
20import android.widget.AbsListView;
21import android.widget.ListView;
22
23class ListViewCompatGingerbread {
24    static void scrollListBy(final ListView listView, int y) {
25        final int firstPosition = listView.getFirstVisiblePosition();
26        if (firstPosition == ListView.INVALID_POSITION) {
27            return;
28        }
29
30        final View firstView = listView.getChildAt(0);
31        if (firstView == null) {
32            return;
33        }
34
35        final int newTop = firstView.getTop() - y;
36        listView.setSelectionFromTop(firstPosition, newTop);
37    }
38}
39