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am b00a1d0c: Correction improvements - use the new InputConnection APIs for underlining and fetching the selected text. 

Merge commit 'b00a1d0c0adbdfc507676772201e979e539a2801' into gingerbread-plus-aosp

* commit 'b00a1d0c0adbdfc507676772201e979e539a2801':
  Correction improvements - use the new InputConnection APIs for underlining and
main
Amith Yamasani 2010-09-01 14:53:08 -07:00 committed by Android Git Automerger
parent 2c7583f6c3 b00a1d0c0a
commit c354167c84
3 changed files with 288 additions and 178 deletions
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5
java/src/com/android/inputmethod/latin/CandidateView.java
View File

@ -107,7 +107,6 @@ public class CandidateView extends View {
}
break;
}
}
};
@ -333,6 +332,10 @@ public class CandidateView extends View {
requestLayout();
}
public boolean isShowingAddToDictionaryHint() {
return mShowingAddToDictionary;
}
public void showAddToDictionaryHint(CharSequence word) {
ArrayList<CharSequence> suggestions = new ArrayList<CharSequence>();
suggestions.add(word);

190
java/src/com/android/inputmethod/latin/EditingUtil.java
View File

@ -16,10 +16,13 @@
package com.android.inputmethod.latin;
import android.text.TextUtils;
import android.view.inputmethod.ExtractedText;
import android.view.inputmethod.ExtractedTextRequest;
import android.view.inputmethod.InputConnection;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.regex.Pattern;
/**
@ -31,6 +34,11 @@ public class EditingUtil {
*/
private static final int LOOKBACK_CHARACTER_NUM = 15;
// Cache Method pointers
private static boolean sMethodsInitialized;
private static Method sMethodGetSelectedText;
private static Method sMethodSetComposingRegion;
private EditingUtil() {};
/**
@ -65,30 +73,10 @@ public class EditingUtil {
return extracted.startOffset + extracted.selectionStart;
}
private static int getSelectionEnd(InputConnection connection) {
ExtractedText extracted = connection.getExtractedText(
new ExtractedTextRequest(), 0);
if (extracted == null) {
return -1;
}
return extracted.startOffset + extracted.selectionEnd;
}
/**
* @param connection connection to the current text field.
* @param sep characters which may separate words
* @return the word that surrounds the cursor, including up to one trailing
* separator. For example, if the field contains "he|llo world", where |
* represents the cursor, then "hello " will be returned.
*/
public static String getWordAtCursor(
InputConnection connection, String separators) {
return getWordAtCursor(connection, separators, null);
}
/**
* @param connection connection to the current text field.
* @param sep characters which may separate words
* @param range the range object to store the result into
* @return the word that surrounds the cursor, including up to one trailing
* separator. For example, if the field contains "he|llo world", where |
* represents the cursor, then "hello " will be returned.
@ -204,26 +192,146 @@ public class EditingUtil {
}
}
/**
* Checks if the cursor is touching/inside a word or the selection is for a whole
* word and no more and no less.
* @param range the Range object that contains the bounds of the word around the cursor
* @param start the start of the selection
* @param end the end of the selection, which could be the same as the start, if text is not
* in selection mode
* @return false if the selection is a partial word or straddling multiple words, true if
* the selection is a full word or there is no selection.
*/
public static boolean isFullWordOrInside(Range range, int start, int end) {
// Is the cursor inside or touching a word?
if (start == end) return true;
// Is it a selection? Then is the start of the selection the start of the word and
// the size of the selection the size of the word? Then return true
if (start < end
&& (range.charsBefore == 0 && range.charsAfter == end - start)) {
return true;
public static class SelectedWord {
public int start;
public int end;
public CharSequence word;
}
/**
* Takes a character sequence with a single character and checks if the character occurs
* in a list of word separators or is empty.
* @param singleChar A CharSequence with null, zero or one character
* @param wordSeparators A String containing the word separators
* @return true if the character is at a word boundary, false otherwise
*/
private static boolean isWordBoundary(CharSequence singleChar, String wordSeparators) {
return TextUtils.isEmpty(singleChar) || wordSeparators.contains(singleChar);
}
/**
* Checks if the cursor is inside a word or the current selection is a whole word.
* @param ic the InputConnection for accessing the text field
* @param selStart the start position of the selection within the text field
* @param selEnd the end position of the selection within the text field. This could be
* the same as selStart, if there's no selection.
* @param wordSeparators the word separator characters for the current language
* @return an object containing the text and coordinates of the selected/touching word,
* null if the selection/cursor is not marking a whole word.
*/
public static SelectedWord getWordAtCursorOrSelection(final InputConnection ic,
int selStart, int selEnd, String wordSeparators) {
if (selStart == selEnd) {
// There is just a cursor, so get the word at the cursor
EditingUtil.Range range = new EditingUtil.Range();
CharSequence touching = getWordAtCursor(ic, wordSeparators, range);
if (!TextUtils.isEmpty(touching)) {
SelectedWord selWord = new SelectedWord();
selWord.word = touching;
selWord.start = selStart - range.charsBefore;
selWord.end = selEnd + range.charsAfter;
return selWord;
}
} else {
// Is the previous character empty or a word separator? If not, return null.
CharSequence charsBefore = ic.getTextBeforeCursor(1, 0);
if (!isWordBoundary(charsBefore, wordSeparators)) {
return null;
}
// Is the next character empty or a word separator? If not, return null.
CharSequence charsAfter = ic.getTextAfterCursor(1, 0);
if (!isWordBoundary(charsAfter, wordSeparators)) {
return null;
}
// Extract the selection alone
CharSequence touching = getSelectedText(ic, selStart, selEnd);
if (TextUtils.isEmpty(touching)) return null;
// Is any part of the selection a separator? If so, return null.
final int length = touching.length();
for (int i = 0; i < length; i++) {
if (wordSeparators.contains(touching.subSequence(i, i + 1))) {
return null;
}
}
// Prepare the selected word
SelectedWord selWord = new SelectedWord();
selWord.start = selStart;
selWord.end = selEnd;
selWord.word = touching;
return selWord;
}
return null;
}
/**
* Cache method pointers for performance
*/
private static void initializeMethodsForReflection() {
try {
// These will either both exist or not, so no need for separate try/catch blocks.
// If other methods are added later, use separate try/catch blocks.
sMethodGetSelectedText = InputConnection.class.getMethod("getSelectedText", int.class);
sMethodSetComposingRegion = InputConnection.class.getMethod("setComposingRegion",
int.class, int.class);
} catch (NoSuchMethodException exc) {
// Ignore
}
sMethodsInitialized = true;
}
/**
* Returns the selected text between the selStart and selEnd positions.
*/
private static CharSequence getSelectedText(InputConnection ic, int selStart, int selEnd) {
// Use reflection, for backward compatibility
CharSequence result = null;
if (!sMethodsInitialized) {
initializeMethodsForReflection();
}
if (sMethodGetSelectedText != null) {
try {
result = (CharSequence) sMethodGetSelectedText.invoke(ic, 0);
return result;
} catch (InvocationTargetException exc) {
// Ignore
} catch (IllegalArgumentException e) {
// Ignore
} catch (IllegalAccessException e) {
// Ignore
}
}
// Reflection didn't work, try it the poor way, by moving the cursor to the start,
// getting the text after the cursor and moving the text back to selected mode.
// TODO: Verify that this works properly in conjunction with
// LatinIME#onUpdateSelection
ic.setSelection(selStart, selEnd);
result = ic.getTextAfterCursor(selEnd - selStart, 0);
ic.setSelection(selStart, selEnd);
return result;
}
/**
* Tries to set the text into composition mode if there is support for it in the framework.
*/
public static void underlineWord(InputConnection ic, SelectedWord word) {
// Use reflection, for backward compatibility
// If method not found, there's nothing we can do. It still works but just wont underline
// the word.
if (!sMethodsInitialized) {
initializeMethodsForReflection();
}
if (sMethodSetComposingRegion != null) {
try {
sMethodSetComposingRegion.invoke(ic, word.start, word.end);
} catch (InvocationTargetException exc) {
// Ignore
} catch (IllegalArgumentException e) {
// Ignore
} catch (IllegalAccessException e) {
// Ignore
}
}
return false;
}
}

173
java/src/com/android/inputmethod/latin/LatinIME.java
View File

@ -86,7 +86,6 @@ public class LatinIME extends InputMethodService
static final boolean TRACE = false;
static final boolean VOICE_INSTALLED = true;
static final boolean ENABLE_VOICE_BUTTON = true;
private static final boolean MODIFY_TEXT_FOR_CORRECTION = false;
private static final String PREF_VIBRATE_ON = "vibrate_on";
private static final String PREF_SOUND_ON = "sound_on";
@ -767,8 +766,12 @@ public class LatinIME extends InputMethodService
mLastSelectionEnd = newSelEnd;
// Don't look for corrections if the keyboard is not visible
if (mKeyboardSwitcher != null && mKeyboardSwitcher.getInputView() != null
&& mKeyboardSwitcher.getInputView().isShown()) {
// Check if we should go in or out of correction mode.
if (isPredictionOn() && mJustRevertedSeparator == null
if (isPredictionOn()
&& mJustRevertedSeparator == null
&& (candidatesStart == candidatesEnd || newSelStart != oldSelStart
|| TextEntryState.isCorrecting())
&& (newSelStart < newSelEnd - 1 || (!mPredicting))
@ -780,6 +783,7 @@ public class LatinIME extends InputMethodService
}
}
}
}
@Override
public void hideWindow() {
@ -818,7 +822,7 @@ public class LatinIME extends InputMethodService
if (mCompletionOn) {
mCompletions = completions;
if (completions == null) {
setSuggestions(null, false, false, false);
clearSuggestions();
return;
}
@ -1253,7 +1257,7 @@ public class LatinIME extends InputMethodService
private void abortCorrection(boolean force) {
if (force || TextEntryState.isCorrecting()) {
getCurrentInputConnection().finishComposingText();
setSuggestions(null, false, false, false);
clearSuggestions();
}
}
@ -1266,7 +1270,9 @@ public class LatinIME extends InputMethodService
// Assume input length is 1. This assumption fails for smiley face insertions.
mVoiceInput.incrementTextModificationInsertCount(1);
}
if (mLastSelectionStart == mLastSelectionEnd && TextEntryState.isCorrecting()) {
abortCorrection(false);
}
if (isAlphabet(primaryCode) && isPredictionOn() && !isCursorTouchingWord()) {
if (!mPredicting) {
@ -1495,7 +1501,7 @@ public class LatinIME extends InputMethodService
}
// Clear N-best suggestions
setSuggestions(null, false, false, true);
clearSuggestions();
FieldContext context = new FieldContext(
getCurrentInputConnection(),
@ -1602,13 +1608,15 @@ public class LatinIME extends InputMethodService
mVoiceInputHighlighted = true;
mWordToSuggestions.putAll(mVoiceResults.alternatives);
}
private void clearSuggestions() {
setSuggestions(null, false, false, false);
}
private void setSuggestions(
List<CharSequence> suggestions,
boolean completions,
boolean typedWordValid,
boolean haveMinimalSuggestion) {
@ -1652,14 +1660,14 @@ public class LatinIME extends InputMethodService
}
private void showSuggestions(WordComposer word) {
//long startTime = System.currentTimeMillis(); // TIME MEASUREMENT!
// long startTime = System.currentTimeMillis(); // TIME MEASUREMENT!
// TODO Maybe need better way of retrieving previous word
CharSequence prevWord = EditingUtil.getPreviousWord(getCurrentInputConnection(),
mWordSeparators);
List<CharSequence> stringList = mSuggest.getSuggestions(
mKeyboardSwitcher.getInputView(), word, false, prevWord);
//long stopTime = System.currentTimeMillis(); // TIME MEASUREMENT!
//Log.d("LatinIME","Suggest Total Time - " + (stopTime - startTime));
// long stopTime = System.currentTimeMillis(); // TIME MEASUREMENT!
// Log.d("LatinIME","Suggest Total Time - " + (stopTime - startTime));
int[] nextLettersFrequencies = mSuggest.getNextLettersFrequencies();
@ -1780,18 +1788,23 @@ public class LatinIME extends InputMethodService
mJustAddedAutoSpace = true;
}
final boolean showingAddToDictionaryHint = index == 0 && mCorrectionMode > 0
&& !mSuggest.isValidWord(suggestion)
&& !mSuggest.isValidWord(suggestion.toString().toLowerCase());
if (!correcting) {
// Fool the state watcher so that a subsequent backspace will not do a revert, unless
// we just did a correction, in which case we need to stay in
// TextEntryState.State.PICKED_SUGGESTION state.
if (!correcting) {
TextEntryState.typedCharacter((char) KEYCODE_SPACE, true);
setNextSuggestions();
} else {
} else if (!showingAddToDictionaryHint) {
// If we're not showing the "Tap again to save hint", then show corrections again.
// In case the cursor position doesn't change, make sure we show the suggestions again.
clearSuggestions();
postUpdateOldSuggestions();
}
if (index == 0 && mCorrectionMode > 0 && !mSuggest.isValidWord(suggestion)
&& !mSuggest.isValidWord(suggestion.toString().toLowerCase())) {
if (showingAddToDictionaryHint) {
mCandidateView.showAddToDictionaryHint(suggestion);
}
if (ic != null) {
@ -1841,16 +1854,6 @@ public class LatinIME extends InputMethodService
InputConnection ic = getCurrentInputConnection();
if (ic != null) {
rememberReplacedWord(suggestion);
// If text is in correction mode and we're not using composing
// text to underline, then the word at the cursor position needs
// to be removed before committing the correction
if (correcting && !MODIFY_TEXT_FOR_CORRECTION) {
if (mLastSelectionStart < mLastSelectionEnd) {
ic.setSelection(mLastSelectionStart, mLastSelectionStart);
}
EditingUtil.deleteWordAtCursor(ic, getWordSeparators());
}
ic.commitText(suggestion, 1);
}
saveWordInHistory(suggestion);
@ -1864,96 +1867,108 @@ public class LatinIME extends InputMethodService
updateShiftKeyState(getCurrentInputEditorInfo());
}
private void setOldSuggestions() {
// TODO: Inefficient to check if touching word and then get the touching word. Do it
// in one go.
mShowingVoiceSuggestions = false;
InputConnection ic = getCurrentInputConnection();
if (ic == null) return;
ic.beginBatchEdit();
// If there is a selection, then undo the selection first. Unfortunately this causes
// a flicker. TODO: Add getSelectionText() to InputConnection API.
if (mLastSelectionStart < mLastSelectionEnd) {
ic.setSelection(mLastSelectionStart, mLastSelectionStart);
}
if (!mPredicting && isCursorTouchingWord()) {
EditingUtil.Range range = new EditingUtil.Range();
CharSequence touching = EditingUtil.getWordAtCursor(getCurrentInputConnection(),
mWordSeparators, range);
// If it's a selection, check if it's an entire word and no more, no less.
boolean fullword = EditingUtil.isFullWordOrInside(range, mLastSelectionStart,
mLastSelectionEnd);
if (fullword && touching != null && touching.length() > 1) {
// Strip out any trailing word separator
if (mWordSeparators.indexOf(touching.charAt(touching.length() - 1)) > 0) {
touching = touching.toString().substring(0, touching.length() - 1);
}
/**
* Tries to apply any voice alternatives for the word if this was a spoken word and
* there are voice alternatives.
* @param touching The word that the cursor is touching, with position information
* @return true if an alternative was found, false otherwise.
*/
private boolean applyVoiceAlternatives(EditingUtil.SelectedWord touching) {
// Search for result in spoken word alternatives
String selectedWord = touching.toString().trim();
if (!mWordToSuggestions.containsKey(selectedWord)){
String selectedWord = touching.word.toString().trim();
if (!mWordToSuggestions.containsKey(selectedWord)) {
selectedWord = selectedWord.toLowerCase();
}
if (mWordToSuggestions.containsKey(selectedWord)){
if (mWordToSuggestions.containsKey(selectedWord)) {
mShowingVoiceSuggestions = true;
underlineWord(touching, range.charsBefore, range.charsAfter);
List<CharSequence> suggestions = mWordToSuggestions.get(selectedWord);
// If the first letter of touching is capitalized, make all the suggestions
// start with a capital letter.
if (Character.isUpperCase((char) touching.charAt(0))) {
for (int i=0; i< suggestions.size(); i++) {
if (Character.isUpperCase((char) touching.word.charAt(0))) {
for (int i = 0; i < suggestions.size(); i++) {
String origSugg = (String) suggestions.get(i);
String capsSugg = origSugg.toUpperCase().charAt(0)
+ origSugg.subSequence(1, origSugg.length()).toString();
suggestions.set(i,capsSugg);
suggestions.set(i, capsSugg);
}
}
setSuggestions(suggestions, false, true, true);
setCandidatesViewShown(true);
TextEntryState.selectedForCorrection();
ic.endBatchEdit();
return;
return true;
}
return false;
}
/**
* Tries to apply any typed alternatives for the word if we have any cached alternatives,
* otherwise tries to find new corrections and completions for the word.
* @param touching The word that the cursor is touching, with position information
* @return true if an alternative was found, false otherwise.
*/
private boolean applyTypedAlternatives(EditingUtil.SelectedWord touching) {
// If we didn't find a match, search for result in typed word history
WordComposer foundWord = null;
WordAlternatives alternatives = null;
for (WordAlternatives entry : mWordHistory) {
if (TextUtils.equals(entry.getChosenWord(), touching)) {
if (TextUtils.equals(entry.getChosenWord(), touching.word)) {
if (entry instanceof TypedWordAlternatives) {
foundWord = ((TypedWordAlternatives)entry).word;
foundWord = ((TypedWordAlternatives) entry).word;
}
alternatives = entry;
break;
}
}
// If we didn't find a match, at least suggest completions
if (foundWord == null && mSuggest.isValidWord(touching)) {
if (foundWord == null
&& (mSuggest.isValidWord(touching.word)
|| mSuggest.isValidWord(touching.word.toString().toLowerCase()))) {
foundWord = new WordComposer();
for (int i = 0; i < touching.length(); i++) {
foundWord.add(touching.charAt(i), new int[] { touching.charAt(i) });
for (int i = 0; i < touching.word.length(); i++) {
foundWord.add(touching.word.charAt(i), new int[] {
touching.word.charAt(i)
});
}
foundWord.setCapitalized(Character.isUpperCase(touching.word.charAt(0)));
}
// Found a match, show suggestions
if (foundWord != null || alternatives != null) {
underlineWord(touching, range.charsBefore, range.charsAfter);
TextEntryState.selectedForCorrection();
if (alternatives == null) alternatives = new TypedWordAlternatives(touching,
foundWord);
if (alternatives == null) {
alternatives = new TypedWordAlternatives(touching.word, foundWord);
}
showCorrections(alternatives);
if (foundWord != null) {
mWord = new WordComposer(foundWord);
} else {
mWord.reset();
}
// Revert the selection
if (mLastSelectionStart < mLastSelectionEnd) {
ic.setSelection(mLastSelectionStart, mLastSelectionEnd);
return true;
}
ic.endBatchEdit();
return false;
}
private void setOldSuggestions() {
mShowingVoiceSuggestions = false;
if (mCandidateView != null && mCandidateView.isShowingAddToDictionaryHint()) {
return;
}
InputConnection ic = getCurrentInputConnection();
if (ic == null) return;
if (!mPredicting) {
// Extract the selected or touching text
EditingUtil.SelectedWord touching = EditingUtil.getWordAtCursorOrSelection(ic,
mLastSelectionStart, mLastSelectionEnd, mWordSeparators);
if (touching != null && touching.word.length() > 1) {
ic.beginBatchEdit();
if (!applyVoiceAlternatives(touching) && !applyTypedAlternatives(touching)) {
abortCorrection(true);
} else {
TextEntryState.selectedForCorrection();
EditingUtil.underlineWord(ic, touching);
}
ic.endBatchEdit();
} else {
abortCorrection(true);
setNextSuggestions();
@ -1961,28 +1976,12 @@ public class LatinIME extends InputMethodService
} else {
abortCorrection(true);
}
// Revert the selection
if (mLastSelectionStart < mLastSelectionEnd) {
ic.setSelection(mLastSelectionStart, mLastSelectionEnd);
}
ic.endBatchEdit();
}
private void setNextSuggestions() {
setSuggestions(mSuggestPuncList, false, false, false);
}
private void underlineWord(CharSequence word, int left, int right) {
InputConnection ic = getCurrentInputConnection();
if (ic == null) return;
if (MODIFY_TEXT_FOR_CORRECTION) {
ic.finishComposingText();
ic.deleteSurroundingText(left, right);
ic.setComposingText(word, 1);
}
ic.setSelection(mLastSelectionStart, mLastSelectionStart);
}
private void addToDictionaries(CharSequence suggestion, int frequencyDelta) {
checkAddToDictionary(suggestion, frequencyDelta, false);
}