1 /* 2 * Copyright (C) 2006 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 17 package android.text.method; 18 19 import android.compat.annotation.UnsupportedAppUsage; 20 import android.os.Build; 21 22 /** 23 * This transformation method causes any carriage return characters (\r) 24 * to be hidden by displaying them as zero-width non-breaking space 25 * characters (\uFEFF). 26 */ 27 @android.ravenwood.annotation.RavenwoodKeepWholeClass 28 public class HideReturnsTransformationMethod 29 extends ReplacementTransformationMethod { 30 private static char[] ORIGINAL = new char[] { '\r' }; 31 private static char[] REPLACEMENT = new char[] { '\uFEFF' }; 32 33 /** 34 * The character to be replaced is \r. 35 */ getOriginal()36 protected char[] getOriginal() { 37 return ORIGINAL; 38 } 39 40 /** 41 * The character that \r is replaced with is \uFEFF. 42 */ getReplacement()43 protected char[] getReplacement() { 44 return REPLACEMENT; 45 } 46 getInstance()47 public static HideReturnsTransformationMethod getInstance() { 48 if (sInstance != null) 49 return sInstance; 50 51 sInstance = new HideReturnsTransformationMethod(); 52 return sInstance; 53 } 54 55 @UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.P, trackingBug = 115609023) 56 private static HideReturnsTransformationMethod sInstance; 57 } 58