675 lines
30 KiB
Java
675 lines
30 KiB
Java
/*
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* Copyright (C) 2012 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License"); you may not
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* use this file except in compliance with the License. You may obtain a copy of
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* 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, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations under
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* the License.
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*/
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package com.android.inputmethod.latin;
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import android.inputmethodservice.InputMethodService;
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import android.text.TextUtils;
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import android.util.Log;
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import android.view.KeyEvent;
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import android.view.inputmethod.CompletionInfo;
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import android.view.inputmethod.CorrectionInfo;
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import android.view.inputmethod.ExtractedText;
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import android.view.inputmethod.ExtractedTextRequest;
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import android.view.inputmethod.InputConnection;
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import com.android.inputmethod.keyboard.Keyboard;
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import com.android.inputmethod.latin.define.ProductionFlag;
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import com.android.inputmethod.research.ResearchLogger;
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import java.util.Locale;
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import java.util.regex.Pattern;
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/**
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* Enrichment class for InputConnection to simplify interaction and add functionality.
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*
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* This class serves as a wrapper to be able to simply add hooks to any calls to the underlying
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* InputConnection. It also keeps track of a number of things to avoid having to call upon IPC
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* all the time to find out what text is in the buffer, when we need it to determine caps mode
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* for example.
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*/
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public class RichInputConnection {
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private static final String TAG = RichInputConnection.class.getSimpleName();
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private static final boolean DBG = false;
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private static final boolean DEBUG_PREVIOUS_TEXT = false;
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// Provision for a long word pair and a separator
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private static final int LOOKBACK_CHARACTER_NUM = BinaryDictionary.MAX_WORD_LENGTH * 2 + 1;
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private static final Pattern spaceRegex = Pattern.compile("\\s+");
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private static final int INVALID_CURSOR_POSITION = -1;
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/**
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* This variable contains the value LatinIME thinks the cursor position should be at now.
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* This is a few steps in advance of what the TextView thinks it is, because TextView will
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* only know after the IPC calls gets through.
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*/
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private int mCurrentCursorPosition = INVALID_CURSOR_POSITION; // in chars, not code points
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/**
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* This contains the committed text immediately preceding the cursor and the composing
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* text if any. It is refreshed when the cursor moves by calling upon the TextView.
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*/
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private StringBuilder mCommittedTextBeforeComposingText = new StringBuilder();
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/**
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* This contains the currently composing text, as LatinIME thinks the TextView is seeing it.
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*/
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private StringBuilder mComposingText = new StringBuilder();
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/**
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* This is a one-character string containing the character after the cursor. Since LatinIME
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* never touches it directly, it's never modified by any means other than re-reading from the
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* TextView when the cursor position is changed by the user.
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*/
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private CharSequence mCharAfterTheCursor = "";
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// A hint on how many characters to cache from the TextView. A good value of this is given by
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// how many characters we need to be able to almost always find the caps mode.
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private static final int DEFAULT_TEXT_CACHE_SIZE = 100;
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private final InputMethodService mParent;
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InputConnection mIC;
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int mNestLevel;
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public RichInputConnection(final InputMethodService parent) {
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mParent = parent;
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mIC = null;
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mNestLevel = 0;
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}
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private void checkConsistencyForDebug() {
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final ExtractedTextRequest r = new ExtractedTextRequest();
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r.hintMaxChars = 0;
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r.hintMaxLines = 0;
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r.token = 1;
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r.flags = 0;
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final ExtractedText et = mIC.getExtractedText(r, 0);
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final CharSequence beforeCursor = getTextBeforeCursor(DEFAULT_TEXT_CACHE_SIZE, 0);
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final StringBuilder internal = new StringBuilder().append(mCommittedTextBeforeComposingText)
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.append(mComposingText);
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if (null == et || null == beforeCursor) return;
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final int actualLength = Math.min(beforeCursor.length(), internal.length());
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if (internal.length() > actualLength) {
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internal.delete(0, internal.length() - actualLength);
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}
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final String reference = (beforeCursor.length() <= actualLength) ? beforeCursor.toString()
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: beforeCursor.subSequence(beforeCursor.length() - actualLength,
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beforeCursor.length()).toString();
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if (et.selectionStart != mCurrentCursorPosition
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|| !(reference.equals(internal.toString()))) {
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final String context = "Expected cursor position = " + mCurrentCursorPosition
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+ "\nActual cursor position = " + et.selectionStart
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+ "\nExpected text = " + internal.length() + " " + internal
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+ "\nActual text = " + reference.length() + " " + reference;
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((LatinIME)mParent).debugDumpStateAndCrashWithException(context);
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} else {
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Log.e(TAG, Utils.getStackTrace(2));
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Log.e(TAG, "Exp <> Actual : " + mCurrentCursorPosition + " <> " + et.selectionStart);
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}
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}
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public void beginBatchEdit() {
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if (++mNestLevel == 1) {
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mIC = mParent.getCurrentInputConnection();
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if (null != mIC) {
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mIC.beginBatchEdit();
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}
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} else {
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if (DBG) {
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throw new RuntimeException("Nest level too deep");
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} else {
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Log.e(TAG, "Nest level too deep : " + mNestLevel);
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}
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}
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checkBatchEdit();
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if (DEBUG_PREVIOUS_TEXT) checkConsistencyForDebug();
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}
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public void endBatchEdit() {
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if (mNestLevel <= 0) Log.e(TAG, "Batch edit not in progress!"); // TODO: exception instead
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if (--mNestLevel == 0 && null != mIC) {
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mIC.endBatchEdit();
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}
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if (DEBUG_PREVIOUS_TEXT) checkConsistencyForDebug();
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}
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public void resetCachesUponCursorMove(final int newCursorPosition) {
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mCurrentCursorPosition = newCursorPosition;
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mComposingText.setLength(0);
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mCommittedTextBeforeComposingText.setLength(0);
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mCommittedTextBeforeComposingText.append(getTextBeforeCursor(DEFAULT_TEXT_CACHE_SIZE, 0));
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mCharAfterTheCursor = getTextAfterCursor(1, 0);
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if (null != mIC) {
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mIC.finishComposingText();
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if (ProductionFlag.IS_EXPERIMENTAL) {
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ResearchLogger.richInputConnection_finishComposingText();
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}
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}
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}
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private void checkBatchEdit() {
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if (mNestLevel != 1) {
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// TODO: exception instead
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Log.e(TAG, "Batch edit level incorrect : " + mNestLevel);
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Log.e(TAG, Utils.getStackTrace(4));
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}
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}
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public void finishComposingText() {
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checkBatchEdit();
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if (DEBUG_PREVIOUS_TEXT) checkConsistencyForDebug();
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mCommittedTextBeforeComposingText.append(mComposingText);
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mCurrentCursorPosition += mComposingText.length();
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mComposingText.setLength(0);
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if (null != mIC) {
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mIC.finishComposingText();
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if (ProductionFlag.IS_EXPERIMENTAL) {
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ResearchLogger.richInputConnection_finishComposingText();
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}
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}
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}
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public void commitText(final CharSequence text, final int i) {
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checkBatchEdit();
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if (DEBUG_PREVIOUS_TEXT) checkConsistencyForDebug();
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mCommittedTextBeforeComposingText.append(text);
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mCurrentCursorPosition += text.length() - mComposingText.length();
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mComposingText.setLength(0);
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if (null != mIC) {
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mIC.commitText(text, i);
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if (ProductionFlag.IS_EXPERIMENTAL) {
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ResearchLogger.richInputConnection_commitText(text, i);
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}
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}
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}
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public int getCursorCapsMode(final int inputType, final Locale locale) {
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mIC = mParent.getCurrentInputConnection();
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if (null == mIC) return Constants.TextUtils.CAP_MODE_OFF;
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if (!TextUtils.isEmpty(mComposingText)) return Constants.TextUtils.CAP_MODE_OFF;
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// TODO: this will generally work, but there may be cases where the buffer contains SOME
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// information but not enough to determine the caps mode accurately. This may happen after
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// heavy pressing of delete, for example DEFAULT_TEXT_CACHE_SIZE - 5 times or so.
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// getCapsMode should be updated to be able to return a "not enough info" result so that
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// we can get more context only when needed.
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if (TextUtils.isEmpty(mCommittedTextBeforeComposingText) && 0 != mCurrentCursorPosition) {
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mCommittedTextBeforeComposingText.append(
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getTextBeforeCursor(DEFAULT_TEXT_CACHE_SIZE, 0));
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}
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// This never calls InputConnection#getCapsMode - in fact, it's a static method that
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// never blocks or initiates IPC.
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return StringUtils.getCapsMode(mCommittedTextBeforeComposingText, inputType, locale);
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}
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public CharSequence getTextBeforeCursor(final int i, final int j) {
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mIC = mParent.getCurrentInputConnection();
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if (null != mIC) return mIC.getTextBeforeCursor(i, j);
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return null;
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}
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public CharSequence getTextAfterCursor(final int i, final int j) {
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mIC = mParent.getCurrentInputConnection();
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if (null != mIC) return mIC.getTextAfterCursor(i, j);
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return null;
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}
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public void deleteSurroundingText(final int i, final int j) {
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checkBatchEdit();
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final int remainingChars = mComposingText.length() - i;
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if (remainingChars >= 0) {
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mComposingText.setLength(remainingChars);
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} else {
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mComposingText.setLength(0);
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// Never cut under 0
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final int len = Math.max(mCommittedTextBeforeComposingText.length()
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+ remainingChars, 0);
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mCommittedTextBeforeComposingText.setLength(len);
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}
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if (mCurrentCursorPosition > i) {
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mCurrentCursorPosition -= i;
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} else {
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mCurrentCursorPosition = 0;
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}
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if (null != mIC) {
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mIC.deleteSurroundingText(i, j);
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if (ProductionFlag.IS_EXPERIMENTAL) {
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ResearchLogger.richInputConnection_deleteSurroundingText(i, j);
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}
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}
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if (DEBUG_PREVIOUS_TEXT) checkConsistencyForDebug();
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}
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public void performEditorAction(final int actionId) {
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mIC = mParent.getCurrentInputConnection();
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if (null != mIC) {
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mIC.performEditorAction(actionId);
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if (ProductionFlag.IS_EXPERIMENTAL) {
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ResearchLogger.richInputConnection_performEditorAction(actionId);
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}
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}
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}
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public void sendKeyEvent(final KeyEvent keyEvent) {
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checkBatchEdit();
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if (keyEvent.getAction() == KeyEvent.ACTION_DOWN) {
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if (DEBUG_PREVIOUS_TEXT) checkConsistencyForDebug();
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// This method is only called for enter or backspace when speaking to old
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// applications (target SDK <= 15), or for digits.
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// When talking to new applications we never use this method because it's inherently
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// racy and has unpredictable results, but for backward compatibility we continue
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// sending the key events for only Enter and Backspace because some applications
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// mistakenly catch them to do some stuff.
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switch (keyEvent.getKeyCode()) {
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case KeyEvent.KEYCODE_ENTER:
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mCommittedTextBeforeComposingText.append("\n");
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mCurrentCursorPosition += 1;
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break;
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case KeyEvent.KEYCODE_DEL:
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if (0 == mComposingText.length()) {
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if (mCommittedTextBeforeComposingText.length() > 0) {
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mCommittedTextBeforeComposingText.delete(
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mCommittedTextBeforeComposingText.length() - 1,
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mCommittedTextBeforeComposingText.length());
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}
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} else {
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mComposingText.delete(mComposingText.length() - 1, mComposingText.length());
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}
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if (mCurrentCursorPosition > 0) mCurrentCursorPosition -= 1;
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break;
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case KeyEvent.KEYCODE_UNKNOWN:
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if (null != keyEvent.getCharacters()) {
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mCommittedTextBeforeComposingText.append(keyEvent.getCharacters());
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mCurrentCursorPosition += keyEvent.getCharacters().length();
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}
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break;
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default:
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final String text = new String(new int[] { keyEvent.getUnicodeChar() }, 0, 1);
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mCommittedTextBeforeComposingText.append(text);
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mCurrentCursorPosition += text.length();
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break;
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}
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}
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if (null != mIC) {
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mIC.sendKeyEvent(keyEvent);
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if (ProductionFlag.IS_EXPERIMENTAL) {
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ResearchLogger.richInputConnection_sendKeyEvent(keyEvent);
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}
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}
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}
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public void setComposingText(final CharSequence text, final int i) {
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checkBatchEdit();
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if (DEBUG_PREVIOUS_TEXT) checkConsistencyForDebug();
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mCurrentCursorPosition += text.length() - mComposingText.length();
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mComposingText.setLength(0);
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mComposingText.append(text);
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// TODO: support values of i != 1. At this time, this is never called with i != 1.
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if (null != mIC) {
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mIC.setComposingText(text, i);
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if (ProductionFlag.IS_EXPERIMENTAL) {
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ResearchLogger.richInputConnection_setComposingText(text, i);
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}
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}
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if (DEBUG_PREVIOUS_TEXT) checkConsistencyForDebug();
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}
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public void setSelection(final int from, final int to) {
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checkBatchEdit();
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if (DEBUG_PREVIOUS_TEXT) checkConsistencyForDebug();
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if (null != mIC) {
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mIC.setSelection(from, to);
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if (ProductionFlag.IS_EXPERIMENTAL) {
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ResearchLogger.richInputConnection_setSelection(from, to);
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}
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}
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mCurrentCursorPosition = from;
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mCommittedTextBeforeComposingText.setLength(0);
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mCommittedTextBeforeComposingText.append(getTextBeforeCursor(DEFAULT_TEXT_CACHE_SIZE, 0));
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}
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public void commitCorrection(final CorrectionInfo correctionInfo) {
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checkBatchEdit();
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if (DEBUG_PREVIOUS_TEXT) checkConsistencyForDebug();
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// This has no effect on the text field and does not change its content. It only makes
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// TextView flash the text for a second based on indices contained in the argument.
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if (null != mIC) {
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mIC.commitCorrection(correctionInfo);
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if (ProductionFlag.IS_EXPERIMENTAL) {
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ResearchLogger.richInputConnection_commitCorrection(correctionInfo);
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}
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}
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if (DEBUG_PREVIOUS_TEXT) checkConsistencyForDebug();
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}
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public void commitCompletion(final CompletionInfo completionInfo) {
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checkBatchEdit();
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if (DEBUG_PREVIOUS_TEXT) checkConsistencyForDebug();
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final CharSequence text = completionInfo.getText();
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mCommittedTextBeforeComposingText.append(text);
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mCurrentCursorPosition += text.length() - mComposingText.length();
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mComposingText.setLength(0);
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if (null != mIC) {
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mIC.commitCompletion(completionInfo);
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if (ProductionFlag.IS_EXPERIMENTAL) {
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ResearchLogger.richInputConnection_commitCompletion(completionInfo);
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}
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}
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if (DEBUG_PREVIOUS_TEXT) checkConsistencyForDebug();
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}
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public CharSequence getNthPreviousWord(final String sentenceSeperators, final int n) {
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mIC = mParent.getCurrentInputConnection();
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if (null == mIC) return null;
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final CharSequence prev = mIC.getTextBeforeCursor(LOOKBACK_CHARACTER_NUM, 0);
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if (DEBUG_PREVIOUS_TEXT && null != prev) {
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final int checkLength = LOOKBACK_CHARACTER_NUM - 1;
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final String reference = prev.length() <= checkLength ? prev.toString()
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: prev.subSequence(prev.length() - checkLength, prev.length()).toString();
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final StringBuilder internal = new StringBuilder()
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.append(mCommittedTextBeforeComposingText).append(mComposingText);
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if (internal.length() > checkLength) {
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internal.delete(0, internal.length() - checkLength);
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if (!(reference.equals(internal.toString()))) {
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final String context =
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"Expected text = " + internal + "\nActual text = " + reference;
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((LatinIME)mParent).debugDumpStateAndCrashWithException(context);
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}
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}
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}
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return getNthPreviousWord(prev, sentenceSeperators, n);
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}
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/**
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* Represents a range of text, relative to the current cursor position.
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*/
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public static class Range {
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/** Characters before selection start */
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public final int mCharsBefore;
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/**
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* Characters after selection start, including one trailing word
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* separator.
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*/
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public final int mCharsAfter;
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/** The actual characters that make up a word */
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public final String mWord;
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public Range(int charsBefore, int charsAfter, String word) {
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if (charsBefore < 0 || charsAfter < 0) {
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throw new IndexOutOfBoundsException();
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}
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this.mCharsBefore = charsBefore;
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this.mCharsAfter = charsAfter;
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this.mWord = word;
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}
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}
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private static boolean isSeparator(int code, String sep) {
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return sep.indexOf(code) != -1;
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}
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// Get the nth word before cursor. n = 1 retrieves the word immediately before the cursor,
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// n = 2 retrieves the word before that, and so on. This splits on whitespace only.
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// Also, it won't return words that end in a separator (if the nth word before the cursor
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// ends in a separator, it returns null).
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// Example :
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// (n = 1) "abc def|" -> def
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// (n = 1) "abc def |" -> def
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// (n = 1) "abc def. |" -> null
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// (n = 1) "abc def . |" -> null
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// (n = 2) "abc def|" -> abc
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// (n = 2) "abc def |" -> abc
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// (n = 2) "abc def. |" -> abc
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// (n = 2) "abc def . |" -> def
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// (n = 2) "abc|" -> null
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// (n = 2) "abc |" -> null
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// (n = 2) "abc. def|" -> null
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public static CharSequence getNthPreviousWord(final CharSequence prev,
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final String sentenceSeperators, final int n) {
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if (prev == null) return null;
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String[] w = spaceRegex.split(prev);
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// If we can't find n words, or we found an empty word, return null.
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if (w.length < n || w[w.length - n].length() <= 0) return null;
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// If ends in a separator, return null
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char lastChar = w[w.length - n].charAt(w[w.length - n].length() - 1);
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if (sentenceSeperators.contains(String.valueOf(lastChar))) return null;
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return w[w.length - n];
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}
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/**
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* @param separators characters which may separate words
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* @return the word that surrounds the cursor, including up to one trailing
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* separator. For example, if the field contains "he|llo world", where |
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* represents the cursor, then "hello " will be returned.
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*/
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public String getWordAtCursor(String separators) {
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// getWordRangeAtCursor returns null if the connection is null
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Range r = getWordRangeAtCursor(separators, 0);
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return (r == null) ? null : r.mWord;
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}
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private int getCursorPosition() {
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mIC = mParent.getCurrentInputConnection();
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if (null == mIC) return INVALID_CURSOR_POSITION;
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final ExtractedText extracted = mIC.getExtractedText(new ExtractedTextRequest(), 0);
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if (extracted == null) {
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return INVALID_CURSOR_POSITION;
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}
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return extracted.startOffset + extracted.selectionStart;
|
|
}
|
|
|
|
/**
|
|
* Returns the text surrounding the cursor.
|
|
*
|
|
* @param sep a string of characters that split words.
|
|
* @param additionalPrecedingWordsCount the number of words before the current word that should
|
|
* be included in the returned range
|
|
* @return a range containing the text surrounding the cursor
|
|
*/
|
|
public Range getWordRangeAtCursor(String sep, int additionalPrecedingWordsCount) {
|
|
mIC = mParent.getCurrentInputConnection();
|
|
if (mIC == null || sep == null) {
|
|
return null;
|
|
}
|
|
CharSequence before = mIC.getTextBeforeCursor(1000, 0);
|
|
CharSequence after = mIC.getTextAfterCursor(1000, 0);
|
|
if (before == null || after == null) {
|
|
return null;
|
|
}
|
|
|
|
// Going backward, alternate skipping non-separators and separators until enough words
|
|
// have been read.
|
|
int start = before.length();
|
|
boolean isStoppingAtWhitespace = true; // toggles to indicate what to stop at
|
|
while (true) { // see comments below for why this is guaranteed to halt
|
|
while (start > 0) {
|
|
final int codePoint = Character.codePointBefore(before, start);
|
|
if (isStoppingAtWhitespace == isSeparator(codePoint, sep)) {
|
|
break; // inner loop
|
|
}
|
|
--start;
|
|
if (Character.isSupplementaryCodePoint(codePoint)) {
|
|
--start;
|
|
}
|
|
}
|
|
// isStoppingAtWhitespace is true every other time through the loop,
|
|
// so additionalPrecedingWordsCount is guaranteed to become < 0, which
|
|
// guarantees outer loop termination
|
|
if (isStoppingAtWhitespace && (--additionalPrecedingWordsCount < 0)) {
|
|
break; // outer loop
|
|
}
|
|
isStoppingAtWhitespace = !isStoppingAtWhitespace;
|
|
}
|
|
|
|
// Find last word separator after the cursor
|
|
int end = -1;
|
|
while (++end < after.length()) {
|
|
final int codePoint = Character.codePointAt(after, end);
|
|
if (isSeparator(codePoint, sep)) {
|
|
break;
|
|
}
|
|
if (Character.isSupplementaryCodePoint(codePoint)) {
|
|
++end;
|
|
}
|
|
}
|
|
|
|
int cursor = getCursorPosition();
|
|
if (start >= 0 && cursor + end <= after.length() + before.length()) {
|
|
String word = before.toString().substring(start, before.length())
|
|
+ after.toString().substring(0, end);
|
|
return new Range(before.length() - start, end, word);
|
|
}
|
|
|
|
return null;
|
|
}
|
|
|
|
public boolean isCursorTouchingWord(final SettingsValues settingsValues) {
|
|
CharSequence before = getTextBeforeCursor(1, 0);
|
|
CharSequence after = getTextAfterCursor(1, 0);
|
|
if (!TextUtils.isEmpty(before) && !settingsValues.isWordSeparator(before.charAt(0))
|
|
&& !settingsValues.isSymbolExcludedFromWordSeparators(before.charAt(0))) {
|
|
return true;
|
|
}
|
|
if (!TextUtils.isEmpty(after) && !settingsValues.isWordSeparator(after.charAt(0))
|
|
&& !settingsValues.isSymbolExcludedFromWordSeparators(after.charAt(0))) {
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
public void removeTrailingSpace() {
|
|
checkBatchEdit();
|
|
final CharSequence lastOne = getTextBeforeCursor(1, 0);
|
|
if (lastOne != null && lastOne.length() == 1
|
|
&& lastOne.charAt(0) == Keyboard.CODE_SPACE) {
|
|
deleteSurroundingText(1, 0);
|
|
}
|
|
}
|
|
|
|
public boolean sameAsTextBeforeCursor(final CharSequence text) {
|
|
final CharSequence beforeText = getTextBeforeCursor(text.length(), 0);
|
|
return TextUtils.equals(text, beforeText);
|
|
}
|
|
|
|
/* (non-javadoc)
|
|
* Returns the word before the cursor if the cursor is at the end of a word, null otherwise
|
|
*/
|
|
public CharSequence getWordBeforeCursorIfAtEndOfWord(final SettingsValues settings) {
|
|
// Bail out if the cursor is in the middle of a word (cursor must be followed by whitespace,
|
|
// separator or end of line/text)
|
|
// Example: "test|"<EOL> "te|st" get rejected here
|
|
final CharSequence textAfterCursor = getTextAfterCursor(1, 0);
|
|
if (!TextUtils.isEmpty(textAfterCursor)
|
|
&& !settings.isWordSeparator(textAfterCursor.charAt(0))) return null;
|
|
|
|
// Bail out if word before cursor is 0-length or a single non letter (like an apostrophe)
|
|
// Example: " -|" gets rejected here but "e-|" and "e|" are okay
|
|
CharSequence word = getWordAtCursor(settings.mWordSeparators);
|
|
// We don't suggest on leading single quotes, so we have to remove them from the word if
|
|
// it starts with single quotes.
|
|
while (!TextUtils.isEmpty(word) && Keyboard.CODE_SINGLE_QUOTE == word.charAt(0)) {
|
|
word = word.subSequence(1, word.length());
|
|
}
|
|
if (TextUtils.isEmpty(word)) return null;
|
|
// Find the last code point of the string
|
|
final int lastCodePoint = Character.codePointBefore(word, word.length());
|
|
// If for some reason the text field contains non-unicode binary data, or if the
|
|
// charsequence is exactly one char long and the contents is a low surrogate, return null.
|
|
if (!Character.isDefined(lastCodePoint)) return null;
|
|
// Bail out if the cursor is not at the end of a word (cursor must be preceded by
|
|
// non-whitespace, non-separator, non-start-of-text)
|
|
// Example ("|" is the cursor here) : <SOL>"|a" " |a" " | " all get rejected here.
|
|
if (settings.isWordSeparator(lastCodePoint)) return null;
|
|
final char firstChar = word.charAt(0); // we just tested that word is not empty
|
|
if (word.length() == 1 && !Character.isLetter(firstChar)) return null;
|
|
|
|
// We only suggest on words that start with a letter or a symbol that is excluded from
|
|
// word separators (see #handleCharacterWhileInBatchEdit).
|
|
if (!(Character.isLetter(firstChar)
|
|
|| settings.isSymbolExcludedFromWordSeparators(firstChar))) {
|
|
return null;
|
|
}
|
|
|
|
return word;
|
|
}
|
|
|
|
public boolean revertDoubleSpace() {
|
|
checkBatchEdit();
|
|
// Here we test whether we indeed have a period and a space before us. This should not
|
|
// be needed, but it's there just in case something went wrong.
|
|
final CharSequence textBeforeCursor = getTextBeforeCursor(2, 0);
|
|
if (!". ".equals(textBeforeCursor)) {
|
|
// Theoretically we should not be coming here if there isn't ". " before the
|
|
// cursor, but the application may be changing the text while we are typing, so
|
|
// anything goes. We should not crash.
|
|
Log.d(TAG, "Tried to revert double-space combo but we didn't find "
|
|
+ "\". \" just before the cursor.");
|
|
return false;
|
|
}
|
|
deleteSurroundingText(2, 0);
|
|
commitText(" ", 1);
|
|
return true;
|
|
}
|
|
|
|
public boolean revertSwapPunctuation() {
|
|
checkBatchEdit();
|
|
// Here we test whether we indeed have a space and something else before us. This should not
|
|
// be needed, but it's there just in case something went wrong.
|
|
final CharSequence textBeforeCursor = getTextBeforeCursor(2, 0);
|
|
// NOTE: This does not work with surrogate pairs. Hopefully when the keyboard is able to
|
|
// enter surrogate pairs this code will have been removed.
|
|
if (TextUtils.isEmpty(textBeforeCursor)
|
|
|| (Keyboard.CODE_SPACE != textBeforeCursor.charAt(1))) {
|
|
// We may only come here if the application is changing the text while we are typing.
|
|
// This is quite a broken case, but not logically impossible, so we shouldn't crash,
|
|
// but some debugging log may be in order.
|
|
Log.d(TAG, "Tried to revert a swap of punctuation but we didn't "
|
|
+ "find a space just before the cursor.");
|
|
return false;
|
|
}
|
|
deleteSurroundingText(2, 0);
|
|
commitText(" " + textBeforeCursor.subSequence(0, 1), 1);
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* Heuristic to determine if this is an expected update of the cursor.
|
|
*
|
|
* Sometimes updates to the cursor position are late because of their asynchronous nature.
|
|
* This method tries to determine if this update is one, based on the values of the cursor
|
|
* position in the update, and the currently expected position of the cursor according to
|
|
* LatinIME's internal accounting. If this is not a belated expected update, then it should
|
|
* mean that the user moved the cursor explicitly.
|
|
* This is quite robust, but of course it's not perfect. In particular, it will fail in the
|
|
* case we get an update A, the user types in N characters so as to move the cursor to A+N but
|
|
* we don't get those, and then the user places the cursor between A and A+N, and we get only
|
|
* this update and not the ones in-between. This is almost impossible to achieve even trying
|
|
* very very hard.
|
|
*
|
|
* @param oldSelStart The value of the old cursor position in the update.
|
|
* @param newSelStart The value of the new cursor position in the update.
|
|
* @return whether this is a belated expected update or not.
|
|
*/
|
|
public boolean isBelatedExpectedUpdate(final int oldSelStart, final int newSelStart) {
|
|
// If this is an update that arrives at our expected position, it's a belated update.
|
|
if (newSelStart == mCurrentCursorPosition) return true;
|
|
// If this is an update that moves the cursor from our expected position, it must be
|
|
// an explicit move.
|
|
if (oldSelStart == mCurrentCursorPosition) return false;
|
|
// The following returns true if newSelStart is between oldSelStart and
|
|
// mCurrentCursorPosition. We assume that if the updated position is between the old
|
|
// position and the expected position, then it must be a belated update.
|
|
return (newSelStart - oldSelStart) * (mCurrentCursorPosition - newSelStart) >= 0;
|
|
}
|
|
}
|