1/*
2 * Copyright (C) 2015 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 */
16package com.android.systemui.tuner;
17
18import android.content.Context;
19import android.util.AttributeSet;
20import android.view.DragEvent;
21import android.widget.ScrollView;
22
23public class AutoScrollView extends ScrollView {
24
25    private static final float SCROLL_PERCENT = .10f;
26
27    public AutoScrollView(Context context, AttributeSet attrs) {
28        super(context, attrs);
29    }
30
31    public boolean onDragEvent(DragEvent event) {
32        switch (event.getAction()) {
33            case DragEvent.ACTION_DRAG_LOCATION:
34                int y = (int) event.getY();
35                int height = getHeight();
36                int scrollPadding = (int) (height * SCROLL_PERCENT);
37                if (y < scrollPadding) {
38                    scrollBy(0, y - scrollPadding);
39                } else if (y > height - scrollPadding) {
40                    scrollBy(0, y - height + scrollPadding);
41                }
42                break;
43        }
44        return false;
45    }
46}
47