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// Copyright 2011 Google Inc. All Rights Reserved.
package android.widget;
import android.content.Context;
import android.text.Editable;
import android.text.Selection;
import android.text.Spanned;
import android.text.style.SpellCheckSpan;
import android.text.style.SuggestionSpan;
import android.util.Log;
import android.view.textservice.SpellCheckerSession;
import android.view.textservice.SpellCheckerSession.SpellCheckerSessionListener;
import android.view.textservice.SuggestionsInfo;
import android.view.textservice.TextInfo;
import android.view.textservice.TextServicesManager;
import com.android.internal.util.ArrayUtils;
import java.util.Locale;
/**
* Helper class for TextView. Bridge between the TextView and the Dictionnary service.
*
* @hide
*/
public class SpellChecker implements SpellCheckerSessionListener {
private static final String LOG_TAG = "SpellChecker";
private static final boolean DEBUG_SPELL_CHECK = false;
private static final int DELAY_BEFORE_SPELL_CHECK = 400; // milliseconds
private final TextView mTextView;
final SpellCheckerSession spellCheckerSession;
final int mCookie;
// Paired arrays for the (id, spellCheckSpan) pair. mIndex is the next available position
private int[] mIds;
private SpellCheckSpan[] mSpellCheckSpans;
// The actual current number of used slots in the above arrays
private int mLength;
private int mSpanSequenceCounter = 0;
private Runnable mChecker;
public SpellChecker(TextView textView) {
mTextView = textView;
final TextServicesManager textServicesManager = (TextServicesManager) textView.getContext().
getSystemService(Context.TEXT_SERVICES_MANAGER_SERVICE);
spellCheckerSession = textServicesManager.newSpellCheckerSession(
null /* not currently used by the textServicesManager */, Locale.getDefault(),
this, true /* means use the languages defined in Settings */);
mCookie = hashCode();
// Arbitrary: 4 simultaneous spell check spans. Will automatically double size on demand
final int size = ArrayUtils.idealObjectArraySize(4);
mIds = new int[size];
mSpellCheckSpans = new SpellCheckSpan[size];
mLength = 0;
}
public void addSpellCheckSpan(SpellCheckSpan spellCheckSpan) {
int length = mIds.length;
if (mLength >= length) {
final int newSize = length * 2;
int[] newIds = new int[newSize];
SpellCheckSpan[] newSpellCheckSpans = new SpellCheckSpan[newSize];
System.arraycopy(mIds, 0, newIds, 0, length);
System.arraycopy(mSpellCheckSpans, 0, newSpellCheckSpans, 0, length);
mIds = newIds;
mSpellCheckSpans = newSpellCheckSpans;
}
mIds[mLength] = mSpanSequenceCounter++;
mSpellCheckSpans[mLength] = spellCheckSpan;
mLength++;
if (DEBUG_SPELL_CHECK) {
final Editable mText = (Editable) mTextView.getText();
int start = mText.getSpanStart(spellCheckSpan);
int end = mText.getSpanEnd(spellCheckSpan);
if (start >= 0 && end >= 0) {
Log.d(LOG_TAG, "Schedule check " + mText.subSequence(start, end));
} else {
Log.d(LOG_TAG, "Schedule check EMPTY!");
}
}
scheduleSpellCheck();
}
public void removeSpellCheckSpan(SpellCheckSpan spellCheckSpan) {
for (int i = 0; i < mLength; i++) {
if (mSpellCheckSpans[i] == spellCheckSpan) {
removeAtIndex(i);
return;
}
}
}
private void removeAtIndex(int i) {
System.arraycopy(mIds, i + 1, mIds, i, mLength - i - 1);
System.arraycopy(mSpellCheckSpans, i + 1, mSpellCheckSpans, i, mLength - i - 1);
mLength--;
}
public void onSelectionChanged() {
scheduleSpellCheck();
}
private void scheduleSpellCheck() {
if (mLength == 0) return;
if (mChecker != null) {
mTextView.removeCallbacks(mChecker);
}
if (mChecker == null) {
mChecker = new Runnable() {
public void run() {
spellCheck();
}
};
}
mTextView.postDelayed(mChecker, DELAY_BEFORE_SPELL_CHECK);
}
private void spellCheck() {
final Editable editable = (Editable) mTextView.getText();
final int selectionStart = Selection.getSelectionStart(editable);
final int selectionEnd = Selection.getSelectionEnd(editable);
TextInfo[] textInfos = new TextInfo[mLength];
int textInfosCount = 0;
for (int i = 0; i < mLength; i++) {
SpellCheckSpan spellCheckSpan = mSpellCheckSpans[i];
if (spellCheckSpan.isSpellCheckInProgress()) continue;
final int start = editable.getSpanStart(spellCheckSpan);
final int end = editable.getSpanEnd(spellCheckSpan);
// Do not check this word if the user is currently editing it
if (start >= 0 && end > start && (selectionEnd < start || selectionStart > end)) {
final String word = editable.subSequence(start, end).toString();
spellCheckSpan.setSpellCheckInProgress();
textInfos[textInfosCount++] = new TextInfo(word, mCookie, mIds[i]);
}
}
if (textInfosCount > 0) {
if (textInfosCount < mLength) {
TextInfo[] textInfosCopy = new TextInfo[textInfosCount];
System.arraycopy(textInfos, 0, textInfosCopy, 0, textInfosCount);
textInfos = textInfosCopy;
}
spellCheckerSession.getSuggestions(textInfos, SuggestionSpan.SUGGESTIONS_MAX_SIZE,
false /* TODO Set sequentialWords to true for initial spell check */);
}
}
@Override
public void onGetSuggestions(SuggestionsInfo[] results) {
final Editable editable = (Editable) mTextView.getText();
for (int i = 0; i < results.length; i++) {
SuggestionsInfo suggestionsInfo = results[i];
if (suggestionsInfo.getCookie() != mCookie) continue;
final int sequenceNumber = suggestionsInfo.getSequence();
// Starting from the end, to limit the number of array copy while removing
for (int j = mLength - 1; j >= 0; j--) {
if (sequenceNumber == mIds[j]) {
SpellCheckSpan spellCheckSpan = mSpellCheckSpans[j];
final int attributes = suggestionsInfo.getSuggestionsAttributes();
boolean isInDictionary =
((attributes & SuggestionsInfo.RESULT_ATTR_IN_THE_DICTIONARY) > 0);
boolean looksLikeTypo =
((attributes & SuggestionsInfo.RESULT_ATTR_LOOKS_LIKE_TYPO) > 0);
if (DEBUG_SPELL_CHECK) {
final int start = editable.getSpanStart(spellCheckSpan);
final int end = editable.getSpanEnd(spellCheckSpan);
Log.d(LOG_TAG, "Result sequence=" + suggestionsInfo.getSequence() + " " +
editable.subSequence(start, end) +
"\t" + (isInDictionary?"IN_DICT" : "NOT_DICT") +
"\t" + (looksLikeTypo?"TYPO" : "NOT_TYPO"));
}
if (!isInDictionary && looksLikeTypo) {
String[] suggestions = getSuggestions(suggestionsInfo);
if (suggestions.length > 0) {
SuggestionSpan suggestionSpan = new SuggestionSpan(
mTextView.getContext(), suggestions,
SuggestionSpan.FLAG_EASY_CORRECT |
SuggestionSpan.FLAG_MISSPELLED);
final int start = editable.getSpanStart(spellCheckSpan);
final int end = editable.getSpanEnd(spellCheckSpan);
editable.setSpan(suggestionSpan, start, end,
Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
// TODO limit to the word rectangle region
mTextView.invalidate();
if (DEBUG_SPELL_CHECK) {
String suggestionsString = "";
for (String s : suggestions) { suggestionsString += s + "|"; }
Log.d(LOG_TAG, " Suggestions for " + sequenceNumber + " " +
editable.subSequence(start, end)+ " " + suggestionsString);
}
}
}
editable.removeSpan(spellCheckSpan);
}
}
}
}
private static String[] getSuggestions(SuggestionsInfo suggestionsInfo) {
final int len = Math.max(0, suggestionsInfo.getSuggestionsCount());
String[] suggestions = new String[len];
for (int j = 0; j < len; ++j) {
suggestions[j] = suggestionsInfo.getSuggestionAt(j);
}
return suggestions;
}
}
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