337 lines
12 KiB
Java
337 lines
12 KiB
Java
/*
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* Copyright (C) 2008 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 com.android.inputmethod.keyboard.Key;
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import com.android.inputmethod.keyboard.KeyDetector;
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import com.android.inputmethod.keyboard.Keyboard;
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import com.android.inputmethod.keyboard.KeyboardActionListener;
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import java.util.Arrays;
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/**
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* A place to store the currently composing word with information such as adjacent key codes as well
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*/
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public class WordComposer {
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public static final int NOT_A_CODE = KeyDetector.NOT_A_CODE;
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public static final int NOT_A_COORDINATE = -1;
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private static final int N = BinaryDictionary.MAX_WORD_LENGTH;
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private int[] mPrimaryKeyCodes;
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private int[] mXCoordinates;
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private int[] mYCoordinates;
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private StringBuilder mTypedWord;
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private CharSequence mAutoCorrection;
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// Cache these values for performance
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private int mCapsCount;
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private boolean mAutoCapitalized;
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private int mTrailingSingleQuotesCount;
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private int mCodePointSize;
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/**
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* Whether the user chose to capitalize the first char of the word.
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*/
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private boolean mIsFirstCharCapitalized;
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public WordComposer() {
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mPrimaryKeyCodes = new int[N];
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mTypedWord = new StringBuilder(N);
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mXCoordinates = new int[N];
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mYCoordinates = new int[N];
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mAutoCorrection = null;
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mTrailingSingleQuotesCount = 0;
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refreshSize();
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}
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public WordComposer(WordComposer source) {
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init(source);
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}
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public void init(WordComposer source) {
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mPrimaryKeyCodes = Arrays.copyOf(source.mPrimaryKeyCodes, source.mPrimaryKeyCodes.length);
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mTypedWord = new StringBuilder(source.mTypedWord);
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mXCoordinates = Arrays.copyOf(source.mXCoordinates, source.mXCoordinates.length);
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mYCoordinates = Arrays.copyOf(source.mYCoordinates, source.mYCoordinates.length);
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mCapsCount = source.mCapsCount;
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mIsFirstCharCapitalized = source.mIsFirstCharCapitalized;
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mAutoCapitalized = source.mAutoCapitalized;
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mTrailingSingleQuotesCount = source.mTrailingSingleQuotesCount;
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refreshSize();
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}
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/**
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* Clear out the keys registered so far.
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*/
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public void reset() {
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mTypedWord.setLength(0);
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mAutoCorrection = null;
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mCapsCount = 0;
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mIsFirstCharCapitalized = false;
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mTrailingSingleQuotesCount = 0;
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refreshSize();
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}
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public final void refreshSize() {
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mCodePointSize = mTypedWord.codePointCount(0, mTypedWord.length());
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}
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/**
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* Number of keystrokes in the composing word.
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* @return the number of keystrokes
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*/
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public final int size() {
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return mCodePointSize;
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}
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public final boolean isComposingWord() {
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return size() > 0;
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}
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// TODO: make sure that the index should not exceed MAX_WORD_LENGTH
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public int getCodeAt(int index) {
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if (index >= BinaryDictionary.MAX_WORD_LENGTH) {
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return -1;
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}
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return mPrimaryKeyCodes[index];
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}
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public int[] getXCoordinates() {
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return mXCoordinates;
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}
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public int[] getYCoordinates() {
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return mYCoordinates;
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}
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private static boolean isFirstCharCapitalized(int index, int codePoint, boolean previous) {
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if (index == 0) return Character.isUpperCase(codePoint);
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return previous && !Character.isUpperCase(codePoint);
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}
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// TODO: remove input keyDetector
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public void add(int primaryCode, int x, int y, KeyDetector keyDetector) {
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final int keyX;
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final int keyY;
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if (null == keyDetector
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|| x == KeyboardActionListener.SUGGESTION_STRIP_COORDINATE
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|| y == KeyboardActionListener.SUGGESTION_STRIP_COORDINATE
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|| x == KeyboardActionListener.NOT_A_TOUCH_COORDINATE
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|| y == KeyboardActionListener.NOT_A_TOUCH_COORDINATE) {
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keyX = x;
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keyY = y;
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} else {
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keyX = keyDetector.getTouchX(x);
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keyY = keyDetector.getTouchY(y);
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}
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add(primaryCode, keyX, keyY);
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}
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/**
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* Add a new keystroke, with codes[0] containing the pressed key's unicode and the rest of
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* the array containing unicode for adjacent keys, sorted by reducing probability/proximity.
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* @param codes the array of unicode values
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*/
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private void add(int primaryCode, int keyX, int keyY) {
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final int newIndex = size();
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mTypedWord.appendCodePoint(primaryCode);
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refreshSize();
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if (newIndex < BinaryDictionary.MAX_WORD_LENGTH) {
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mPrimaryKeyCodes[newIndex] = primaryCode >= Keyboard.CODE_SPACE
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? Character.toLowerCase(primaryCode) : primaryCode;
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mXCoordinates[newIndex] = keyX;
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mYCoordinates[newIndex] = keyY;
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}
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mIsFirstCharCapitalized = isFirstCharCapitalized(
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newIndex, primaryCode, mIsFirstCharCapitalized);
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if (Character.isUpperCase(primaryCode)) mCapsCount++;
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if (Keyboard.CODE_SINGLE_QUOTE == primaryCode) {
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++mTrailingSingleQuotesCount;
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} else {
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mTrailingSingleQuotesCount = 0;
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}
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mAutoCorrection = null;
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}
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/**
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* Internal method to retrieve reasonable proximity info for a character.
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*/
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private void addKeyInfo(final int codePoint, final Keyboard keyboard) {
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for (final Key key : keyboard.mKeys) {
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if (key.mCode == codePoint) {
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final int x = key.mX + key.mWidth / 2;
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final int y = key.mY + key.mHeight / 2;
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add(codePoint, x, y);
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return;
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}
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}
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add(codePoint, WordComposer.NOT_A_COORDINATE, WordComposer.NOT_A_COORDINATE);
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}
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/**
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* Set the currently composing word to the one passed as an argument.
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* This will register NOT_A_COORDINATE for X and Ys, and use the passed keyboard for proximity.
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*/
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public void setComposingWord(final CharSequence word, final Keyboard keyboard) {
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reset();
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final int length = word.length();
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for (int i = 0; i < length; i = Character.offsetByCodePoints(word, i, 1)) {
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int codePoint = Character.codePointAt(word, i);
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addKeyInfo(codePoint, keyboard);
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}
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}
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/**
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* Delete the last keystroke as a result of hitting backspace.
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*/
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public void deleteLast() {
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final int size = size();
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if (size > 0) {
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// Note: mTypedWord.length() and mCodes.length differ when there are surrogate pairs
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final int stringBuilderLength = mTypedWord.length();
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if (stringBuilderLength < size) {
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throw new RuntimeException(
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"In WordComposer: mCodes and mTypedWords have non-matching lengths");
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}
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final int lastChar = mTypedWord.codePointBefore(stringBuilderLength);
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if (Character.isSupplementaryCodePoint(lastChar)) {
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mTypedWord.delete(stringBuilderLength - 2, stringBuilderLength);
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} else {
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mTypedWord.deleteCharAt(stringBuilderLength - 1);
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}
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if (Character.isUpperCase(lastChar)) mCapsCount--;
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refreshSize();
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}
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// We may have deleted the last one.
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if (0 == size()) {
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mIsFirstCharCapitalized = false;
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}
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if (mTrailingSingleQuotesCount > 0) {
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--mTrailingSingleQuotesCount;
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} else {
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int i = mTypedWord.length();
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while (i > 0) {
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i = mTypedWord.offsetByCodePoints(i, -1);
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if (Keyboard.CODE_SINGLE_QUOTE != mTypedWord.codePointAt(i)) break;
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++mTrailingSingleQuotesCount;
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}
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}
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mAutoCorrection = null;
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}
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/**
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* Returns the word as it was typed, without any correction applied.
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* @return the word that was typed so far. Never returns null.
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*/
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public String getTypedWord() {
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return mTypedWord.toString();
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}
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/**
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* Whether or not the user typed a capital letter as the first letter in the word
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* @return capitalization preference
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*/
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public boolean isFirstCharCapitalized() {
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return mIsFirstCharCapitalized;
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}
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public int trailingSingleQuotesCount() {
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return mTrailingSingleQuotesCount;
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}
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/**
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* Whether or not all of the user typed chars are upper case
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* @return true if all user typed chars are upper case, false otherwise
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*/
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public boolean isAllUpperCase() {
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return (mCapsCount > 0) && (mCapsCount == size());
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}
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/**
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* Returns true if more than one character is upper case, otherwise returns false.
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*/
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public boolean isMostlyCaps() {
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return mCapsCount > 1;
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}
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/**
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* Saves the reason why the word is capitalized - whether it was automatic or
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* due to the user hitting shift in the middle of a sentence.
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* @param auto whether it was an automatic capitalization due to start of sentence
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*/
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public void setAutoCapitalized(boolean auto) {
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mAutoCapitalized = auto;
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}
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/**
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* Returns whether the word was automatically capitalized.
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* @return whether the word was automatically capitalized
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*/
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public boolean isAutoCapitalized() {
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return mAutoCapitalized;
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}
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/**
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* Sets the auto-correction for this word.
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*/
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public void setAutoCorrection(final CharSequence correction) {
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mAutoCorrection = correction;
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}
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/**
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* @return the auto-correction for this word, or null if none.
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*/
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public CharSequence getAutoCorrectionOrNull() {
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return mAutoCorrection;
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}
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// `type' should be one of the LastComposedWord.COMMIT_TYPE_* constants above.
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public LastComposedWord commitWord(final int type, final String committedWord,
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final int separatorCode) {
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// Note: currently, we come here whenever we commit a word. If it's a MANUAL_PICK
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// or a DECIDED_WORD we may cancel the commit later; otherwise, we should deactivate
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// the last composed word to ensure this does not happen.
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final int[] primaryKeyCodes = mPrimaryKeyCodes;
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final int[] xCoordinates = mXCoordinates;
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final int[] yCoordinates = mYCoordinates;
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mPrimaryKeyCodes = new int[N];
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mXCoordinates = new int[N];
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mYCoordinates = new int[N];
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final LastComposedWord lastComposedWord = new LastComposedWord(primaryKeyCodes,
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xCoordinates, yCoordinates, mTypedWord.toString(), committedWord, separatorCode);
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if (type != LastComposedWord.COMMIT_TYPE_DECIDED_WORD
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&& type != LastComposedWord.COMMIT_TYPE_MANUAL_PICK) {
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lastComposedWord.deactivate();
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}
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mTypedWord.setLength(0);
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refreshSize();
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mAutoCorrection = null;
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return lastComposedWord;
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}
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public void resumeSuggestionOnLastComposedWord(final LastComposedWord lastComposedWord) {
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mPrimaryKeyCodes = lastComposedWord.mPrimaryKeyCodes;
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mXCoordinates = lastComposedWord.mXCoordinates;
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mYCoordinates = lastComposedWord.mYCoordinates;
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mTypedWord.setLength(0);
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mTypedWord.append(lastComposedWord.mTypedWord);
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refreshSize();
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mAutoCorrection = null; // This will be filled by the next call to updateSuggestion.
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}
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}
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