1d85bc5074dc1211fdb1c6799d9321af54ac5a32fKeisuke Kuroyanagi/* 2d85bc5074dc1211fdb1c6799d9321af54ac5a32fKeisuke Kuroyanagi * Copyright (C) 2016 The Android Open Source Project 3d85bc5074dc1211fdb1c6799d9321af54ac5a32fKeisuke Kuroyanagi * 4d85bc5074dc1211fdb1c6799d9321af54ac5a32fKeisuke Kuroyanagi * Licensed under the Apache License, Version 2.0 (the "License"); 5d85bc5074dc1211fdb1c6799d9321af54ac5a32fKeisuke Kuroyanagi * you may not use this file except in compliance with the License. 6d85bc5074dc1211fdb1c6799d9321af54ac5a32fKeisuke Kuroyanagi * You may obtain a copy of the License at 7d85bc5074dc1211fdb1c6799d9321af54ac5a32fKeisuke Kuroyanagi * 8d85bc5074dc1211fdb1c6799d9321af54ac5a32fKeisuke Kuroyanagi * http://www.apache.org/licenses/LICENSE-2.0 9d85bc5074dc1211fdb1c6799d9321af54ac5a32fKeisuke Kuroyanagi * 10d85bc5074dc1211fdb1c6799d9321af54ac5a32fKeisuke Kuroyanagi * Unless required by applicable law or agreed to in writing, software 11d85bc5074dc1211fdb1c6799d9321af54ac5a32fKeisuke Kuroyanagi * distributed under the License is distributed on an "AS IS" BASIS, 12d85bc5074dc1211fdb1c6799d9321af54ac5a32fKeisuke Kuroyanagi * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13d85bc5074dc1211fdb1c6799d9321af54ac5a32fKeisuke Kuroyanagi * See the License for the specific language governing permissions and 14d85bc5074dc1211fdb1c6799d9321af54ac5a32fKeisuke Kuroyanagi * limitations under the License. 15d85bc5074dc1211fdb1c6799d9321af54ac5a32fKeisuke Kuroyanagi */ 16d85bc5074dc1211fdb1c6799d9321af54ac5a32fKeisuke Kuroyanagi 17d85bc5074dc1211fdb1c6799d9321af54ac5a32fKeisuke Kuroyanagipackage com.android.internal.widget; 18d85bc5074dc1211fdb1c6799d9321af54ac5a32fKeisuke Kuroyanagi 19d85bc5074dc1211fdb1c6799d9321af54ac5a32fKeisuke Kuroyanagipublic class ScrollBarUtils { 20d85bc5074dc1211fdb1c6799d9321af54ac5a32fKeisuke Kuroyanagi 21d85bc5074dc1211fdb1c6799d9321af54ac5a32fKeisuke Kuroyanagi public static int getThumbLength(int size, int thickness, int extent, int range) { 22d85bc5074dc1211fdb1c6799d9321af54ac5a32fKeisuke Kuroyanagi // Avoid the tiny thumb. 23d85bc5074dc1211fdb1c6799d9321af54ac5a32fKeisuke Kuroyanagi final int minLength = thickness * 2; 24d85bc5074dc1211fdb1c6799d9321af54ac5a32fKeisuke Kuroyanagi int length = Math.round((float) size * extent / range); 25d85bc5074dc1211fdb1c6799d9321af54ac5a32fKeisuke Kuroyanagi if (length < minLength) { 26d85bc5074dc1211fdb1c6799d9321af54ac5a32fKeisuke Kuroyanagi length = minLength; 27d85bc5074dc1211fdb1c6799d9321af54ac5a32fKeisuke Kuroyanagi } 28d85bc5074dc1211fdb1c6799d9321af54ac5a32fKeisuke Kuroyanagi return length; 29d85bc5074dc1211fdb1c6799d9321af54ac5a32fKeisuke Kuroyanagi } 30d85bc5074dc1211fdb1c6799d9321af54ac5a32fKeisuke Kuroyanagi 31d85bc5074dc1211fdb1c6799d9321af54ac5a32fKeisuke Kuroyanagi public static int getThumbOffset(int size, int thumbLength, int extent, int range, int offset) { 32d85bc5074dc1211fdb1c6799d9321af54ac5a32fKeisuke Kuroyanagi // Avoid the too-big thumb. 33d85bc5074dc1211fdb1c6799d9321af54ac5a32fKeisuke Kuroyanagi int thumbOffset = Math.round((float) (size - thumbLength) * offset / (range - extent)); 34d85bc5074dc1211fdb1c6799d9321af54ac5a32fKeisuke Kuroyanagi if (thumbOffset > size - thumbLength) { 35d85bc5074dc1211fdb1c6799d9321af54ac5a32fKeisuke Kuroyanagi thumbOffset = size - thumbLength; 36d85bc5074dc1211fdb1c6799d9321af54ac5a32fKeisuke Kuroyanagi } 37d85bc5074dc1211fdb1c6799d9321af54ac5a32fKeisuke Kuroyanagi return thumbOffset; 38d85bc5074dc1211fdb1c6799d9321af54ac5a32fKeisuke Kuroyanagi } 39d85bc5074dc1211fdb1c6799d9321af54ac5a32fKeisuke Kuroyanagi} 40