/*
* Copyright (C) 2016 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.v4.widget;
import android.support.annotation.RequiresApi;
import android.annotation.TargetApi;
import android.view.View;
import android.widget.ListView;
@RequiresApi(9)
@TargetApi(9)
class ListViewCompatGingerbread {
static void scrollListBy(final ListView listView, int y) {
final int firstPosition = listView.getFirstVisiblePosition();
if (firstPosition == ListView.INVALID_POSITION) {
return;
}
final View firstView = listView.getChildAt(0);
if (firstView == null) {
return;
}
final int newTop = firstView.getTop() - y;
listView.setSelectionFromTop(firstPosition, newTop);
}
}