44 lines
1.5 KiB
Java
44 lines
1.5 KiB
Java
/*
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* Copyright (C) 2016 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.android.internal.widget;
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import android.compat.annotation.UnsupportedAppUsage;
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import android.os.Build;
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public class ScrollBarUtils {
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@UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.R, trackingBug = 170729553)
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public static int getThumbLength(int size, int thickness, int extent, int range) {
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// Avoid the tiny thumb.
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final int minLength = thickness * 2;
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int length = Math.round((float) size * extent / range);
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if (length < minLength) {
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length = minLength;
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}
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return length;
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}
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public static int getThumbOffset(int size, int thumbLength, int extent, int range, int offset) {
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// Avoid the too-big thumb.
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int thumbOffset = Math.round((float) (size - thumbLength) * offset / (range - extent));
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if (thumbOffset > size - thumbLength) {
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thumbOffset = size - thumbLength;
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}
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return thumbOffset;
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}
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}
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