/* * Copyright (C) 2018 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.incallui.rtt.impl; import android.support.annotation.NonNull; import android.support.annotation.Nullable; import android.text.TextWatcher; import com.android.incallui.rtt.protocol.Constants; import com.google.common.base.Splitter; import java.util.ArrayList; import java.util.Iterator; import java.util.List; /** Message class that holds one RTT chat content. */ final class RttChatMessage { private static final Splitter SPLITTER = Splitter.on(Constants.BUBBLE_BREAKER); boolean isRemote; public boolean hasAvatar; private final StringBuilder content = new StringBuilder(); private boolean isFinished; public boolean isFinished() { return isFinished; } public void finish() { isFinished = true; } public void append(String text) { for (int i = 0; i < text.length(); i++) { char c = text.charAt(i); if (c != '\b') { content.append(c); } else if (content.length() > 0) { content.deleteCharAt(content.length() - 1); } } } public String getContent() { return content.toString(); } /** * Generates delta change to a text. * *
This is used to track text change of input. See more details in {@link * TextWatcher#onTextChanged} * *
e.g. "hello world" -> "hello" : "\b\b\b\b\b\b" * *
"hello world" -> "hello mom!" : "\b\b\b\b\bmom!" * *
"hello world" -> "hello d" : "\b\b\b\b\bd" * *
"hello world" -> "hello new world" : "\b\b\b\b\bnew world"
*/
static String getChangedString(CharSequence s, int start, int before, int count) {
StringBuilder modify = new StringBuilder();
char c = '\b';
int oldLength = s.length() - count + before;
for (int i = 0; i < oldLength - start; i++) {
modify.append(c);
}
modify.append(s, start, start + count);
if (start + count < s.length()) {
modify.append(s, start + count, s.length());
}
return modify.toString();
}
/** Convert remote input text into an array of {@code RttChatMessage}. */
static RttChatMessage[] getRemoteRttChatMessage(
@Nullable RttChatMessage currentMessage, @NonNull String text) {
Iterator