1 /* 2 * Copyright (C) 2011 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; 18 19 /** 20 * Interface for objects that use a heuristic for guessing at the paragraph direction by examining text. 21 */ 22 @android.ravenwood.annotation.RavenwoodKeepWholeClass 23 public interface TextDirectionHeuristic { 24 /** 25 * Guess if a chars array is in the RTL direction or not. 26 * 27 * @param array the char array. 28 * @param start start index, inclusive. 29 * @param count the length to check, must not be negative and not greater than 30 * {@code array.length - start}. 31 * @return true if all chars in the range are to be considered in a RTL direction, 32 * false otherwise. 33 */ isRtl(char[] array, int start, int count)34 boolean isRtl(char[] array, int start, int count); 35 36 /** 37 * Guess if a {@code CharSequence} is in the RTL direction or not. 38 * 39 * @param cs the CharSequence. 40 * @param start start index, inclusive. 41 * @param count the length to check, must not be negative and not greater than 42 * {@code CharSequence.length() - start}. 43 * @return true if all chars in the range are to be considered in a RTL direction, 44 * false otherwise. 45 */ isRtl(CharSequence cs, int start, int count)46 boolean isRtl(CharSequence cs, int start, int count); 47 } 48