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 */ 16 package com.android.systemui.tuner; 17 18 import android.content.Context; 19 import android.util.AttributeSet; 20 import android.view.DragEvent; 21 import android.widget.ScrollView; 22 23 public 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
