| /* |
| * 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 com.android.internal.widget; |
| |
| public class ScrollBarUtils { |
| |
| public static int getThumbLength(int size, int thickness, int extent, int range) { |
| // Avoid the tiny thumb. |
| final int minLength = thickness * 2; |
| int length = Math.round((float) size * extent / range); |
| if (length < minLength) { |
| length = minLength; |
| } |
| return length; |
| } |
| |
| public static int getThumbOffset(int size, int thumbLength, int extent, int range, int offset) { |
| // Avoid the too-big thumb. |
| int thumbOffset = Math.round((float) (size - thumbLength) * offset / (range - extent)); |
| if (thumbOffset > size - thumbLength) { |
| thumbOffset = size - thumbLength; |
| } |
| return thumbOffset; |
| } |
| } |